Cs fallback feature parameter by Emerson Rodrigues Setim

eRAN TDD

CS Fallback Feature Parameter Description Issue

Date

2016-04-20

HUAWEI TECHNOLOGIES CO., LTD.

Copyright ÂŠ Huawei Technologies Co., Ltd. 2016. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

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Email:

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eRAN TDD CS Fallback Feature Parameter Description

Contents

Contents 1 About This Document.................................................................................................................. 1 1.1 Scope.............................................................................................................................................................................. 1 1.2 Intended Audience.......................................................................................................................................................... 2 1.3 Change History............................................................................................................................................................... 2 1.4 Differences Between eNodeB Types.............................................................................................................................. 5

2 Overview......................................................................................................................................... 6 2.1 Introduction.................................................................................................................................................................... 7 2.2 Benefits........................................................................................................................................................................... 7 2.3 Application Scenarios.....................................................................................................................................................7 2.4 CSFB Mechanisms......................................................................................................................................................... 9 2.4.1 CSFB to UTRAN.......................................................................................................................................................10 2.4.2 CSFB to GERAN.......................................................................................................................................................11

3 CSFB to UTRAN.......................................................................................................................... 14 3.1 Overview...................................................................................................................................................................... 15 3.2 Feature Description.......................................................................................................................................................16 3.2.1 TDLOFD-001033 CS FallBack to UTRAN.............................................................................................................. 16 3.2.2 TDLOFD-001052 Flash CS Fallback to UTRAN..................................................................................................... 16 3.2.3 TDLOFD-081223 Ultra-Flash CSFB to UTRAN..................................................................................................... 17 3.2.4 TDLOFD-001068 CS Fallback with LAI to UTRAN...............................................................................................17 3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering....................................................................................... 19 3.2.6 TDLOFD-001088 CS Fallback Steering to UTRAN................................................................................................ 21 3.2.7 Load-based CSFB to UTRAN................................................................................................................................... 23 3.3 Triggering Events......................................................................................................................................................... 23 3.4 Target Cell/Frequency Selection...................................................................................................................................24 3.5 Decision........................................................................................................................................................................ 30 3.5.1 Basic Decision Method..............................................................................................................................................31 3.5.2 Decision Based on System Information.................................................................................................................... 32 3.6 Execution...................................................................................................................................................................... 33 3.6.1 CSFB Policy Selection.............................................................................................................................................. 33 3.6.2 Redirection-based CSFB Optimization for UEs in Idle Mode.................................................................................. 36 3.6.3 CSFB Admission Optimization for UEs in Idle Mode..............................................................................................37 3.6.4 Retry and Penalty.......................................................................................................................................................37 Issue 02 (2016-04-20)

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eRAN TDD CS Fallback Feature Parameter Description

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3.7 RIM Procedure Between E-UTRAN and UTRAN...................................................................................................... 37 3.7.1 RIM Procedure Through the Core Network.............................................................................................................. 38 3.7.2 RIM Procedure Through the eCoordinator................................................................................................................40

4 CSFB to GERAN.......................................................................................................................... 42 4.1 Overview...................................................................................................................................................................... 43 4.2 Feature Description.......................................................................................................................................................43 4.2.1 TDLOFD-001034 CS Fallback to GERAN...............................................................................................................43 4.2.2 TDLOFD-001053 Flash CSFB to GERAN...............................................................................................................45 4.2.3 TDLOFD-001069 CS Fallback with LAI to GERAN...............................................................................................45 4.2.4 TDLOFD-001089 CS Fallback Steering to GERAN................................................................................................ 45 4.2.5 TDLOFD-081203 Ultra-Flash CSFB to GERAN..................................................................................................... 46 4.3 Triggering..................................................................................................................................................................... 47 4.4 Target Cell/Frequency Selection...................................................................................................................................47 4.5 Decision........................................................................................................................................................................ 48 4.6 Execution...................................................................................................................................................................... 48 4.7 RIM Procedure Between E-UTRAN and GERAN...................................................................................................... 50

5 Handover and CSFB Procedure Conflict Optimization.......................................................52 6 Related Features...........................................................................................................................53 6.1 Features Related to TDLOFD-001033 CS FallBack to UTRAN................................................................................. 53 6.2 Features Related to TDLOFD-001052 Flash CS Fallback to UTRAN........................................................................ 54 6.3 Features Related to TDLOFD-081223 Ultra-Flash CSFB to UTRAN........................................................................ 54 6.4 Features Related to TDLOFD-001068 CS Fallback with LAI to UTRAN.................................................................. 55 6.5 Features Related to TDLOFD-001088 CS Fallback Steering to UTRAN................................................................... 55 6.6 Features Related to TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering.......................................................... 56 6.7 Features Related to TDLOFD-001034 CS Fallback to GERAN..................................................................................56 6.8 Features Related to TDLOFD-001053 Flash CSFB to GERAN.................................................................................. 57 6.9 Features Related to TDLOFD-081203 Ultra-Flash CSFB to GERAN........................................................................ 57 6.10 Features Related to TDLOFD-001069 CS Fallback with LAI to GERAN................................................................ 58 6.11 Features Related to TDLOFD-001089 CS Fallback Steering to GERAN..................................................................58

7 Network Impact........................................................................................................................... 60 7.1 TDLOFD-001033 CS FallBack to UTRAN................................................................................................................. 60 7.2 TDLOFD-001052 Flash CS Fallback to UTRAN........................................................................................................ 61 7.3 TDLOFD-081223 Ultra-Flash CSFB to UTRAN........................................................................................................ 61 7.4 TDLOFD-001068 CS Fallback with LAI to UTRAN..................................................................................................62 7.5 TDLOFD-001088 CS Fallback Steering to UTRAN................................................................................................... 62 7.6 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering.......................................................................................... 62 7.7 TDLOFD-001034 CS Fallback to GERAN..................................................................................................................63 7.8 TDLOFD-001053 Flash CSFB to GERAN..................................................................................................................63 7.9 TDLOFD-081203 Ultra-Flash CSFB to GERAN........................................................................................................ 64 7.10 TDLOFD-001069 CS Fallback with LAI to GERAN................................................................................................64 7.11 TDLOFD-001089 CS Fallback Steering to GERAN................................................................................................. 64 Issue 02 (2016-04-20)

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8 Engineering Guidelines............................................................................................................. 65 8.1 TDLOFD-001033 CS Fallback to UTRAN..................................................................................................................65 8.1.1 When to Use CS Fallback to UTRAN.......................................................................................................................65 8.1.2 Required Information................................................................................................................................................ 65 8.1.3 Requirements............................................................................................................................................................. 66 8.1.4 Precautions.................................................................................................................................................................67 8.1.5 Data Preparation and Feature Activation...................................................................................................................67 8.1.5.1 Data Preparation..................................................................................................................................................... 67 8.1.5.2 Using the CME....................................................................................................................................................... 74 8.1.5.3 Using MML Commands......................................................................................................................................... 75 8.1.6 Activation Observation..............................................................................................................................................79 8.1.7 Deactivation...............................................................................................................................................................85 8.1.7.1 Using the CME....................................................................................................................................................... 85 8.1.7.2 Using MML Commands......................................................................................................................................... 85 8.1.8 Performance Monitoring............................................................................................................................................86 8.1.9 Parameter Optimization............................................................................................................................................. 87 8.2 RIM Procedure from E-UTRAN to UTRAN............................................................................................................... 91 8.2.1 When to Use RIM Procedure from E-UTRAN to UTRAN...................................................................................... 91 8.2.2 Required Information................................................................................................................................................ 91 8.2.3 Requirements............................................................................................................................................................. 91 8.2.4 Precautions.................................................................................................................................................................92 8.2.5 Data Preparation and Feature Activation...................................................................................................................92 8.2.5.1 Data Preparation..................................................................................................................................................... 92 8.2.5.2 Using the CME....................................................................................................................................................... 93 8.2.5.3 Using MML Commands......................................................................................................................................... 93 8.2.6 Activation Observation..............................................................................................................................................93 8.2.7 Deactivation...............................................................................................................................................................95 8.2.7.1 Using the CME....................................................................................................................................................... 95 8.2.7.2 Using MML Commands......................................................................................................................................... 95 8.2.8 Performance Monitoring............................................................................................................................................95 8.2.9 Parameter Optimization............................................................................................................................................. 95 8.3 TDLOFD-001052 Flash CS Fallback to UTRAN........................................................................................................ 95 8.3.1 When to Use Flash CS Fallback to UTRAN............................................................................................................. 96 8.3.2 Required Information................................................................................................................................................ 96 8.3.3 Requirements............................................................................................................................................................. 97 8.3.4 Precautions.................................................................................................................................................................97 8.3.5 Data Preparation and Feature Activation...................................................................................................................97 8.3.5.1 Data Preparation..................................................................................................................................................... 97 8.3.5.2 Using the CME..................................................................................................................................................... 101 8.3.5.3 Using MML Commands....................................................................................................................................... 101 8.3.6 Activation Observation............................................................................................................................................102 8.3.7 Deactivation.............................................................................................................................................................103 Issue 02 (2016-04-20)

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8.3.7.1 Using the CME..................................................................................................................................................... 104 8.3.7.2 Using MML Commands....................................................................................................................................... 104 8.3.8 Performance Monitoring..........................................................................................................................................104 8.3.9 Parameter Optimization........................................................................................................................................... 104 8.4 TDLOFD-081223 Ultra-Flash CSFB to UTRAN...................................................................................................... 104 8.4.1 When to Use Ultra-Flash CSFB to UTRAN........................................................................................................... 104 8.4.2 Required Information.............................................................................................................................................. 104 8.4.3 Requirements........................................................................................................................................................... 105 8.4.4 Precautions...............................................................................................................................................................105 8.4.5 Data Preparation and Feature Activation.................................................................................................................105 8.4.5.1 Data Preparation................................................................................................................................................... 105 8.4.5.2 Using the CME..................................................................................................................................................... 107 8.4.5.3 Using MML Commands....................................................................................................................................... 107 8.4.6 Activation Observation............................................................................................................................................108 8.4.7 Deactivation............................................................................................................................................................. 111 8.4.7.1 Using the CME..................................................................................................................................................... 111 8.4.7.2 Using MML Commands....................................................................................................................................... 111 8.4.8 Performance Monitoring..........................................................................................................................................111 8.4.9 Parameter Optimization........................................................................................................................................... 112 8.5 TDLOFD-001068 CS Fallback with LAI to UTRAN................................................................................................ 112 8.5.1 When to Use CS Fallback with LAI to UTRAN..................................................................................................... 112 8.5.2 Required Information...............................................................................................................................................112 8.5.3 Requirements........................................................................................................................................................... 114 8.5.4 Precautions...............................................................................................................................................................114 8.5.5 Data Preparation and Feature Activation.................................................................................................................114 8.5.5.1 Data Preparation................................................................................................................................................... 114 8.5.5.2 Using the CME..................................................................................................................................................... 114 8.5.5.3 Using MML Commands....................................................................................................................................... 114 8.5.6 Activation Observation............................................................................................................................................ 114 8.5.7 Deactivation............................................................................................................................................................. 115 8.5.8 Performance Monitoring..........................................................................................................................................115 8.5.9 Parameter Optimization........................................................................................................................................... 115 8.6 TDLOFD-001088 CS Fallback Steering to UTRAN................................................................................................. 115 8.6.1 When to Use CS Fallback Steering to UTRAN.......................................................................................................115 8.6.2 Required Information...............................................................................................................................................116 8.6.3 Requirements........................................................................................................................................................... 116 8.6.4 Precautions...............................................................................................................................................................117 8.6.5 Data Preparation and Feature Activation.................................................................................................................117 8.6.5.1 Data Preparation................................................................................................................................................... 117 8.6.5.2 Using the CME..................................................................................................................................................... 122 8.6.5.3 Using MML Commands....................................................................................................................................... 122 8.6.6 Activation Observation............................................................................................................................................124 Issue 02 (2016-04-20)

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8.6.7 Deactivation.............................................................................................................................................................124 8.6.7.1 Using the CME..................................................................................................................................................... 125 8.6.7.2 Using MML Commands....................................................................................................................................... 125 8.6.8 Performance Monitoring..........................................................................................................................................125 8.6.9 Parameter Optimization........................................................................................................................................... 125 8.7 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering........................................................................................ 125 8.7.1 When to Use E-UTRAN to UTRAN CS/PS Steering............................................................................................. 125 8.7.2 Required Information.............................................................................................................................................. 126 8.7.3 Requirements........................................................................................................................................................... 126 8.7.4 Precautions...............................................................................................................................................................126 8.7.5 Data Preparation and Feature Activation.................................................................................................................127 8.7.5.1 Data Preparation................................................................................................................................................... 127 8.7.5.2 Using the CME..................................................................................................................................................... 128 8.7.5.3 Using MML Commands....................................................................................................................................... 129 8.7.6 Activation Observation............................................................................................................................................129 8.7.7 Deactivation.............................................................................................................................................................130 8.7.7.1 Using the CME..................................................................................................................................................... 130 8.7.7.2 Using MML Commands....................................................................................................................................... 130 8.7.8 Performance Monitoring..........................................................................................................................................131 8.7.9 Parameter Optimization........................................................................................................................................... 131 8.8 TDLOFD-001034 CS Fallback to GERAN................................................................................................................131 8.8.1 When to Use CS Fallback to GERAN.....................................................................................................................131 8.8.2 Required Information.............................................................................................................................................. 131 8.8.3 Requirements........................................................................................................................................................... 132 8.8.4 Precautions...............................................................................................................................................................133 8.8.5 Data Preparation and Feature Activation.................................................................................................................133 8.8.5.1 Data Preparation................................................................................................................................................... 133 8.8.5.2 Using the CME..................................................................................................................................................... 139 8.8.5.3 Using MML Commands....................................................................................................................................... 139 8.8.6 Activation Observation............................................................................................................................................145 8.8.7 Deactivation.............................................................................................................................................................148 8.8.7.1 Using MML Commands....................................................................................................................................... 148 8.8.8 Performance Monitoring..........................................................................................................................................148 8.8.9 Parameter Optimization........................................................................................................................................... 150 8.9 RIM Procedure from E-UTRAN to GERAN............................................................................................................. 151 8.9.1 When to Use RIM Procedure from E-UTRAN to GERAN.................................................................................... 151 8.9.2 Required Information.............................................................................................................................................. 152 8.9.3 Requirements........................................................................................................................................................... 152 8.9.4 Precautions...............................................................................................................................................................152 8.9.5 Data Preparation and Feature Activation.................................................................................................................152 8.9.5.1 Data Preparation................................................................................................................................................... 153 8.9.5.2 Using the CME..................................................................................................................................................... 153 Issue 02 (2016-04-20)

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8.9.5.3 Using MML Commands....................................................................................................................................... 153 8.9.6 Activation Observation............................................................................................................................................154 8.9.7 Deactivation.............................................................................................................................................................155 8.9.7.1 Using the CME..................................................................................................................................................... 155 8.9.7.2 Using MML Commands....................................................................................................................................... 155 8.9.8 Performance Monitoring..........................................................................................................................................156 8.9.9 Parameter Optimization........................................................................................................................................... 156 8.10 TDLOFD-001053 Flash CSFB to GERAN..............................................................................................................156 8.10.1 When to Use Flash CS Fallback to GERAN......................................................................................................... 156 8.10.2 Required Information............................................................................................................................................ 156 8.10.3 Requirements......................................................................................................................................................... 157 8.10.4 Precautions.............................................................................................................................................................158 8.10.5 Data Preparation and Feature Activation...............................................................................................................158 8.10.5.1 Data Preparation................................................................................................................................................. 158 8.10.5.2 Using the CME................................................................................................................................................... 162 8.10.5.3 Using MML Commands..................................................................................................................................... 162 8.10.6 Activation Observation..........................................................................................................................................163 8.10.7 Deactivation...........................................................................................................................................................164 8.10.7.1 Using the CME................................................................................................................................................... 165 8.10.7.2 Using MML Commands..................................................................................................................................... 165 8.10.8 Performance Monitoring........................................................................................................................................165 8.10.9 Parameter Optimization......................................................................................................................................... 165 8.11 TDLOFD-081203 Ultra-Flash CSFB to GERAN.................................................................................................... 165 8.11.1 When to Use Ultra-Flash CSFB to GERAN..........................................................................................................165 8.11.2 Required Information.............................................................................................................................................165 8.11.3 Requirements......................................................................................................................................................... 166 8.11.4 Precautions.............................................................................................................................................................166 8.11.5 Data Preparation and Feature Activation...............................................................................................................166 8.11.5.1 Data Preparation................................................................................................................................................. 166 8.11.5.2 Using the CME................................................................................................................................................... 170 8.11.5.3 Using MML Commands..................................................................................................................................... 170 8.11.6 Activation Observation.......................................................................................................................................... 171 8.11.7 Deactivation........................................................................................................................................................... 172 8.11.7.1 Using the CME................................................................................................................................................... 173 8.11.7.2 Using MML Commands..................................................................................................................................... 173 8.11.8 Performance Monitoring........................................................................................................................................173 8.11.9 Parameter Optimization......................................................................................................................................... 173 8.12 TDLOFD-001069 CS Fallback with LAI to GERAN..............................................................................................174 8.12.1 When to Use CS Fallback with LAI to GERAN................................................................................................... 174 8.12.2 Required Information............................................................................................................................................ 174 8.12.3 Requirements......................................................................................................................................................... 175 8.12.4 Precautions.............................................................................................................................................................175 Issue 02 (2016-04-20)

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8.12.5 Data Preparation and Feature Activation...............................................................................................................176 8.12.5.1 Data Preparation................................................................................................................................................. 176 8.12.5.2 Using the CME................................................................................................................................................... 176 8.12.5.3 Using MML Commands..................................................................................................................................... 176 8.12.6 Activation Observation..........................................................................................................................................176 8.12.7 Deactivation...........................................................................................................................................................177 8.12.8 Performance Monitoring........................................................................................................................................177 8.12.9 Parameter Optimization......................................................................................................................................... 177 8.13 TDLOFD-001089 CS Fallback Steering to GERAN............................................................................................... 177 8.13.1 When to Use CS Fallback Steering to GERAN.................................................................................................... 177 8.13.2 Required Information............................................................................................................................................ 177 8.13.3 Requirements......................................................................................................................................................... 178 8.13.4 Precautions.............................................................................................................................................................178 8.13.5 Data Preparation and Feature Activation...............................................................................................................178 8.13.5.1 Data Preparation................................................................................................................................................. 178 8.13.5.2 Using the CME................................................................................................................................................... 181 8.13.5.3 Using MML Commands..................................................................................................................................... 181 8.13.6 Activation Observation..........................................................................................................................................182 8.13.7 Deactivation...........................................................................................................................................................182 8.13.7.1 Using the CME................................................................................................................................................... 183 8.13.7.2 Using MML Commands..................................................................................................................................... 183 8.13.8 Performance Monitoring........................................................................................................................................183 8.13.9 Parameter Optimization......................................................................................................................................... 183 8.14 Troubleshooting........................................................................................................................................................ 183 8.14.1 CSFB Calling Procedure Failure........................................................................................................................... 183 8.14.2 eNodeB Receiving No Measurement Report........................................................................................................ 184 8.14.3 CSFB Blind Handover Failure.............................................................................................................................. 184 8.14.4 CSFB Handover Failure........................................................................................................................................ 185

9 Parameters................................................................................................................................... 187 10 Counters.................................................................................................................................... 264 11 Glossary..................................................................................................................................... 300 12 Reference Documents............................................................................................................. 301 13 Appendix................................................................................................................................... 302 13.1 Signaling Procedures Involved in CSFB to UTRAN............................................................................................... 302 13.1.1 Combined EPS/IMSI Attach Procedure................................................................................................................ 302 13.1.2 CSFB Based on PS Handover............................................................................................................................... 303 13.1.3 CSFB Based on Redirection.................................................................................................................................. 305 13.1.4 Flash CSFB............................................................................................................................................................307 13.1.5 Ultra-Flash CSFB to UTRAN............................................................................................................................... 308 13.1.6 Redirection-based CSFB Optimization for UEs in Idle Mode.............................................................................. 311 Issue 02 (2016-04-20)

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13.1.7 Signaling Procedures for SMS...............................................................................................................................311 13.1.8 Emergency Call..................................................................................................................................................... 312 13.1.9 CSFB for LCS....................................................................................................................................................... 312 13.2 Signaling Procedures Involved in CSFB to GERAN............................................................................................... 312 13.2.1 Combined EPS/IMSI Attach Procedure................................................................................................................ 312 13.2.2 CSFB Based on PS Handover............................................................................................................................... 313 13.2.3 CSFB Based on CCO/NACC................................................................................................................................ 314 13.2.4 CSFB Based on Redirection.................................................................................................................................. 316 13.2.5 Flash CSFB............................................................................................................................................................317 13.2.6 Ultra-Flash CSFB to GERAN............................................................................................................................... 319 13.2.7 Signaling Procedures for SMS.............................................................................................................................. 321 13.2.8 Emergency Call..................................................................................................................................................... 321 13.2.9 CSFB for LCS....................................................................................................................................................... 321

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eRAN TDD CS Fallback Feature Parameter Description

1 About This Document

About This Document

1.1 Scope This document describes circuit switched fallback (CSFB), including its technical principles, related features, network impact, and engineering guidelines. This document covers the following features: l

TDLOFD-001033 CS Fallback to UTRAN

TDLOFD-001052 Flash CSFB to UTRAN

TDLOFD-081223 Ultra-Flash CSFB to UTRAN

TDLOFD-001068 CS Fallback with LAI to UTRAN

TDLOFD-001088 CS Fallback Steering to UTRAN

TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering

TDLOFD-001034 CS Fallback to GERAN

TDLOFD-001053 Flash CSFB to GERAN

TDLOFD-001069 CS Fallback with LAI to GERAN

TDLOFD-001089 CS Fallback Steering to GERAN

TDLOFD-081203 Ultra-Flash CSFB to GERAN

This document mainly describes CSFB implementation principles on the E-UTRAN. If Huawei devices are used in the GERAN or UTRAN to which CS fallback is performed, refer to the following documents to obtain details about CSFB implementation in the corresponding network: l

For the GERAN, see CS Fallback Feature Parameter Description in GBSS Feature Documentation.

For the UTRAN, see Interoperability Between UMTS and LTE Feature Parameter Description in RAN Feature Documentation.

Any managed objects (MOs), parameters, alarms, or counters described herein correspond to the software release delivered with this document. Any future updates will be described in the product documentation delivered with future software releases. This document applies only to LTE TDD. Any "LTE" in this document refers to LTE TDD, and "eNodeB" refers to LTE TDD eNodeB. Issue 02 (2016-04-20)

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eRAN TDD CS Fallback Feature Parameter Description

1 About This Document

This document applies to the following types of eNodeBs. eNodeB Type

Model

Macro

DBS3900 LTE TDD

LampSite

DBS3900 LampSite TDD

Micro

BTS3205E

1.2 Intended Audience This document is intended for personnel who: l

Need to understand the features described herein

Work with Huawei products

1.3 Change History This section provides information about the changes in different document versions. There are two types of changes: l

Feature change Changes in features and parameters of a specified version as well as the affected entities

Editorial change Changes in wording or addition of information and any related parameters affected by editorial changes. Editorial change does not specify the affected entities.

eRAN TDD 11.1 02 (2016-04-20) This issue includes the following changes. Change Type

Change Description

Parameter Change

Affected Entity

Feature change

None

Editorial change

Revised descriptions in the document.

None

N/A

eRAN TDD 11.1 Draft A (2015-12-30) Compared with Issue 01 (2015-09-20) of eRAN TDD 11.0, Draft A (2015-12-30) of eRAN TDD 11.1 includes the following changes.

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eRAN TDD CS Fallback Feature Parameter Description

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1 About This Document

Change Type

Change Description

Parameter Change

Affected Entity

Feature change

Added the switch of disabling blind handover to disable the blind handover function of UEs supporting ultra-flash CSFB when the blind handover function takes effect. For details, see 3.3 Triggering Events.

Added the UFCsfbBlindHoDisS witch option of the CellHoParaCfg.HoM odeSwitch parameter.

Macro, micro, and LampSite eNodeBs

Added the function of deleting inter-frequency measurements during GERAN measurement. For details, see 4.3 Triggering.

Added the CSFB_MEAS_DEL_ INTERFREQ_SW option of the CellAlgoSwitch.Mea sOptAlgoSwitch parameter.

Macro, micro, and LampSite eNodeBs

Added retry and penalty mechanisms for CSFB. For details, see 3.6.4 Retry and Penalty and 4.6 Execution.

None

Macro, micro, and LampSite eNodeBs

Added the processing mechanism when the CSFB procedure conflicts with the handover procedure. The former is preferentially processed. For details, see 5 Handover and CSFB Procedure Conflict Optimization.

Added the CsfbFlowFirstSwitch option of the GlobalProcSwitch.H oProcCtrlSwitch parameter.

Macro, micro, and LampSite eNodeBs

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eRAN TDD CS Fallback Feature Parameter Description

Change Type

1 About This Document

Change Description

Parameter Change

Affected Entity

Added cell-level switch control parameters to the following features:

Added the following parameters:

Macro, micro, and LampSite eNodeBs

l TDLOFD-001033 CS Fallback to UTRAN l TDLOFD-001052 Flash CS Fallback to UTRAN l TDLOFD-001078 EUTRAN to UTRAN CS/PS Steering l TDLOFD-001088 CS Fallback Steering to UTRAN l TDLOFD-001034 CS Fallback to GERAN l TDLOFD-001053 Flash CS Fallback to GERAN l TDLOFD-001089 CS Fallback Steering to GERAN

l UtranCsfbSwitch option of the CellAlgoSwitch.H oAllowedSwitch parameter l UtranFlashCsfbS witch option of the CellAlgoSwitch.H oAllowedSwitch parameter l UtranFreqLayer MeasSwitch option of the CellAlgoSwitch.F reqLayerSwitch parameter l UtranFreqLayer BlindSwitch option of the CellAlgoSwitch.F reqLayerSwitch parameter l UtranCsfbSteerin gSwitch option of the CellAlgoSwitch.H oAllowedSwitch parameter l GeranCsfbSwitch option of the CellAlgoSwitch.H oAllowedSwitch parameter l GeranFlashCsfbS witch option of the CellAlgoSwitch.H oAllowedSwitch parameter l GeranCsfbSteeri ngSwitch option of the CellAlgoSwitch.H oAllowedSwitch parameter

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eRAN TDD CS Fallback Feature Parameter Description

1 About This Document

Change Type

Change Description

Parameter Change

Affected Entity

Editorial change

Revised descriptions in the document.

None

N/A

Revised the descriptions of CME-based feature configuration in engineering guidelines.

None

N/A

1.4 Differences Between eNodeB Types The features described in this document are implemented in the same way on macro, micro, and LampSite eNodeBs.

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eRAN TDD CS Fallback Feature Parameter Description

2 Overview

Overview

In an early phase of evolved packet system (EPS) construction, operators who own a mature UTRAN or GERAN can protect their investments in legacy CS networks and reduce their investments in the EPS by using the legacy UTRAN or GERAN to provide CS services. Currently, CSFB and voice over IP (VoIP) over IP multimedia subsystem (IMS) are the two standard solutions to provide voice services for UEs on LTE networks. After the technological maturity, industry chain, and deployment costs of the two methods are well weighed, CSFB is chosen to serve as an interim solution for voice service access before mature commercial use of IMS.

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eRAN TDD CS Fallback Feature Parameter Description

2 Overview

2.1 Introduction With the CSFB solution, when a UE initiates a CS service, the mobility management entity (MME) instructs the UE to fall back to a legacy CS network before the UE performs the service. CSFB is a session setup procedure. The UE falls back to the CS network before the CS session is set up, and it stays in the CS network during the CS session. For details, see 3GPP TS 23.272 V8.5.0. After receiving CS Fallback Indicator, eNodeBs handle CSFB for different types of CS services in a uniform way. The CS services can be voice services, short message service (SMS), location service (LCS), and emergency calls.

2.2 Benefits CSFB offers the following benefits: l

Facilitates voice services for LTE networks.

Helps operators reduce costs by reusing legacy CS networks with no need to deploy an IMS network.

2.3 Application Scenarios CSFB can be used when the CS network of the UTRAN/GERAN has the same or larger coverage area than that of the E-UTRAN. Figure 2-1 shows the network architecture for CSFB to UTRAN/GERAN. Figure 2-1 Network architecture for CSFB to UTRAN/GERAN

Table 2-1 describes the elements of the network architecture in Figure 2-1. Issue 02 (2016-04-20)

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Table 2-1 Elements of the network architecture for CSFB to UTRAN/GERAN Element

Function

SGs interface

l Is an interface between the MME and the mobile switching center (MSC) server. l Assists mobility management and paging between the EPS and the CS network. l Transmits mobile originated (MO) and mobile terminated (MT) SMS messages. l Transmits messages related to combined attach and combined TAU/ LAU. (TAU is short for tracking area update, and LAU is short for location area update.)

l Is capable of accessing the EPS and accessing the UTRAN, GERAN, or both. l Supports combined EPS/IMSI (IMSI is short for international mobile subscriber identity) attach, combined EPS/IMSI detach, and combined TAU/LAU. l Supports CSFB mechanisms, such as redirection and handover. NOTE CSFB-capable UEs must support SMS over SGs, but UEs that support SMS over SGs are not necessarily CSFB-capable.

MME

l Supports the SGs interface to the MSC/VLR. l Selects the VLR and location area identity (LAI) based on the tracking area identity (TAI) of the serving cell. l Forwards paging messages delivered by the MSC. l Performs public land mobile network (PLMN) selection and reselection. l Supports combined EPS/IMSI attach, combined EPS/IMSI detach, and combined TAU/LAU. l Routes CS signaling. l Supports SMS over SGs. l Supports RAN information management (RIM), which is required when flash CSFB or CCO with NACC is used as the CSFB mechanism. (CCO is short for cell change order and NACC is short for network assisted cell change.)

MSC

l Supports combined EPS/IMSI attach. l Supports SMS over SGs. l Forwards paging messages transmitted through the SGs interface.

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Element

Function

E-UTRAN

l Forwards paging messages related to CSFB. l Selects target cells for CSFB. l Supports one or more of the following functions: – PS redirection to UTRAN or GERAN, if PS redirection is used as the CSFB mechanism. – PS handover to UTRAN or GERAN, if PS handover is used as the CSFB mechanism. – CCO to GERAN, if CCO is used as the CSFB mechanism. – RIM for acquiring the system information of GERAN cells, if NACC is used as the CSFB mechanism. – RIM for acquiring the system information of UTRAN or GERAN cells, in addition to PS redirection, if flash CSFB is used as the CSFB mechanism.

UTRAN/ GERAN

Supports one or more of the following functions: l Incoming handovers from the E-UTRAN, if PS handover is used as the CSFB mechanism. l RIM for delivering the system information of GERAN cells to eNodeBs, if NACC is used as the CSFB mechanism. l RIM for delivering the system information of UTRAN or GERAN cells to eNodeBs, in addition to PS redirection, if flash CSFB is used as the CSFB mechanism. NOTE The UTRAN and GERAN do not need to provide extra functions to support PS redirection. The GERAN does not need to provide extra functions to support CCO.

SGSN

l Supports the follow-up procedures performed for PS handovers, including data forwarding, path switching, RAU, authentication, and encryption. l Supports RIM, which is required when flash CSFB or CCO with NACC is used as the CSFB mechanism.

eCoordinator

Is a network element provided by Huawei, and is optional. The eCoordinator supports information exchange during RIM procedures.

To implement CSFB to provide CS services for E-UTRAN, all MSCs that serve overlapping areas with the E-UTRAN coverage must be upgraded to support functions involving the SGs interfaces between MSCs and MMEs. These functions include combined attach, combined TAU/LAU, paging, and SMS. If the live network uses an MSC pool, only one or multiple MSCs in the MSC pool need to be upgraded to support the SGs interface.

2.4 CSFB Mechanisms

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2.4.1 CSFB to UTRAN Based on the capabilities of UEs and networks, three fallback mechanisms are available for an eNodeB to perform CSFB to UTRAN: l

R8 PS redirection

After receiving a CS Fallback Indicator, the eNodeB sends the UE an RRC Connection Release message that contains frequency information about the target UTRAN. Based on the received frequency information, the UE searches for a UTRAN cell, reads the system information of the UTRAN cell, and initiates initial access and CS sservice setup. l

R9 PS redirection (flash CSFB)

After receiving a CS Fallback Indicator, the eNodeB sends the UE an RRC Connection Release message that contains information about a target UTRAN frequency as well as system information about multiple cells on the frequency. Based on the received frequency information, the UE searches for a UTRAN cell. As the UE has obtained the system information about the target cell, the UE directly initiates initial access and CS service setup in the target cell, reducing voice delay. l

PS handover

The UE is handed over to the UTRAN through a PS handover procedure between the eNodeB and the UTRAN. After the handover, the UE initiates CS service setup in the target cell. Table 2-2 describes the requirements of the three CSFB mechanisms on the network side and UEs. Table 2-2 Requirements of CSFB to UTRAN for networks and UEs Element

R8 PS Redirection

R9 PS Redirection (Flash CSFB)

PS Handover

l Support combined EPS/CS attach and combined TAU/ LAU.

l Support R9 PS redirection with SIB.

l Support PS handover.

l Support CSFB by PS redirection.

l The other requirements are the same as those of R8 PS redirection.

Support CSFB by R8 PS redirection.

l Support the RIM procedure.

Support PS handover.

eNodeB

l The other requirements are the same as those of R8 PS redirection. UTRAN

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N/A

Support the RIM procedure.

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Support PS Handover.

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Element

R8 PS Redirection

R9 PS Redirection (Flash CSFB)

PS Handover

MME

l Support combined EPS/CS attach and combined TAU/ LAU.

l Support the RIM procedure.

Support PS handover.

l Support the CSFB procedure.

l The other requirements are the same as those of R8 PS redirection.

SGSN

N/A

Support the RIM procedure.

Support PS handover.

MSC

l Support combined EPS/CS attach and combined TAU/ LAU.

The requirements are the same as those of R8 PS redirection.

l Support the CSFB procedure.

2.4.2 CSFB to GERAN Based on the capabilities of UEs and networks, five fallback mechanisms are available for an eNodeB to perform CSFB to GERAN: l

R8 PS redirection

For details, see 2.4.1 CSFB to UTRAN. l

R9 PS redirection (flash CSFB)

For details, see 2.4.1 CSFB to UTRAN. l

CCO

After receiving a CS Fallback Indicator, the eNodeB sends the UE a MobilityFromEUTRACommand message that contains a target GERAN cell, instructing the UE to access the cell. The UE must acquire synchronization with the cell and read system information about the cell before it can access the cell to initiate a CS service. l

CCO with NACC

If NACC is enabled, the RIM procedure is started during CCO from E-UTRAN to GERAN. With this procedure, the eNodeB acquires system information about the target cell and delivers it to the UE. The UE accesses the target cell to initiate a CS service with no need to read the system information, reducing the delay. l

PS handover

For details, see 2.4.1 CSFB to UTRAN. Table 2-3 describes the requirements of the five CSFB mechanisms for networks and UEs.

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Table 2-3 Requirements of CSFB to GERAN for networks and UEs Elemen t

R8 PS Redirection

R9 PS Redirection (Flash CSFB)

CCO

CCO with NACC

PS Handover

l Support combined EPS/CS attach and combined TAU/LAU.

l Support R9 PS redirection with SIB.

l Support CCO.

l Support NACC

l The other require ments are the same as those of R8 PS redirecti on.

l The other requirem ents are the same as those of R8 PS redirectio n.

l Support PS handove r.

Support CCO.

l Support the RIM procedur e.

eNodeB

l Support CSFB by PS redirection.

l The other requirements are the same as those of R8 PS redirection.

Support CSFB by R8 PS redirection.

l Support the RIM procedure. l The other requirements are the same as those of R8 PS redirection.

Support PS handover.

l The other requirem ents are the same as those of R8 PS redirectio n.

GERAN

N/A

Support the RIM procedure.

N/A

Support the RIM procedure.

Support PS handover.

MME

l Support combined EPS/CS attach and combined TAU/LAU.

l Support the RIM procedure.

The requiremen ts are the same as those of R8 PS redirection.

l Support the RIM procedur e.

Support PS handover.

l Support the CSFB procedure.

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l The other require ments are the same as those of R8 PS redirecti on.

l The other requirements are the same as those of R8 PS redirection.

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l The other requirem ents are the same as those of R8 PS redirectio n.

eRAN TDD CS Fallback Feature Parameter Description

Elemen t

R8 PS Redirection

R9 PS Redirection (Flash CSFB)

CCO

CCO with NACC

PS Handover

SGSN

N/A

Support the RIM procedure.

N/A

Support the RIM procedure.

Support PS handover.

MSC

l Support combined EPS/CS attach and combined TAU/LAU.

The requirements are the same as those of R8 PS redirection.

The requiremen ts are the same as those of R8 PS redirection.

The requirement s are the same as those of R8 PS redirection.

The requiremen ts are the same as those of R8 PS redirection.

l Support the CSFB procedure.

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CSFB to UTRAN

This chapter describes each CSFB to UTRAN feature, CSFB procedure, and RIM procedure between E-UTRAN and UTRAN.

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3.1 Overview CSFB to UTRAN can be implemented in different ways and includes the following features and functions: l

TDLOFD-001033 CS Fallback to UTRAN

TDLOFD-001052 Flash CS Fallback to UTRAN

TDLOFD-081223 Ultra-Flash CSFB to UTRAN

TDLOFD-001068 CS Fallback with LAI to UTRAN

TDLOFD-001088 CS Fallback Steering to UTRAN

Load-based CSFB to UTRAN

CSFB Procedure Figure 3-1 shows the CSFB to UTRAN procedure. Figure 3-1 CSFB to UTRAN procedure

Measurement and Blind Handling The eNodeB determines whether to trigger UTRAN measurements or blind handling for CSFB to UTRAN based on the status of the blind handover switch first. Issue 02 (2016-04-20)

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If the switch is on, the eNodeB triggers a blind handling.

If the switch is off, the eNodeB checks the UE capability:

3 CSFB to UTRAN

–

If the UE supports UTRAN measurements, the eNodeB triggers inter-RAT measurements.

–

If the UE does not support UTRAN measurements, the eNodeB triggers blind handling.

For details about the measurement and handover, see Overview of Mobility Management in Connected Mode Feature Parameter Description. NOTE

Unless otherwise specified, blind handling includes PS HO, redirection, and fast redirection for CSFB to UTRAN and includes PS HO, CCO, NACC, redirection, and fast redirection for CSFB to GERAN in this document.

3.2 Feature Description 3.2.1 TDLOFD-001033 CS FallBack to UTRAN This section describes the optional feature TDLOFD-001033 CS Fallback to UTRAN. This feature is controlled by the UtranCsfbSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. NOTE

This feature is also controlled by the UtranCsfbSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

When a UE initiates a CS service in the E-UTRAN, the MME sends the eNodeB an S1-AP message containing CS Fallback Indicator, instructing the eNodeB to transfer the UE with the CS service to a target network. For details about MOC and MTC signaling procedures, see 13.1 Signaling Procedures Involved in CSFB to UTRAN.

3.2.2 TDLOFD-001052 Flash CS Fallback to UTRAN This section describes the optional feature TDLOFD-001033 Flash CS Fallback to UTRAN. This feature is controlled by the UtranFlashCsfbSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. NOTE

This feature is also controlled by the UtranFlashCsfbSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

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UTRAN cells through RIM procedures and then sends UEs the EUTRAN-to-UTRAN redirection messages that contain the system information. In this way, the UEs access the UTRAN cells with no need to read the system information in the cells. This reduces the access delay. For details about how the UTRAN sends the system information to the eNodeB through RIM procedures, see Flash CS Fallback Based on RIM Feature Parameter Description. This feature requires that the eNodeB can obtain UTRAN cell information through the RIM procedures and the networks and UEs involved should comply with 3GPP Release 9 or later. For details about the RIM procedure, see 3.7 RIM Procedure Between E-UTRAN and UTRAN. Other procedures are the same as those for CS Fallback to UTRAN. For details, see 3.2.1 TDLOFD-001033 CS FallBack to UTRAN.

3.2.3 TDLOFD-081223 Ultra-Flash CSFB to UTRAN This section describes the optional feature TDLOFD-081223 Ultra-Flash CSFB to UTRAN. The UtranUltraFlashCsfbSwitch option of the ENodeBAlgoSwitch.HoAlgoSwitch parameter specifies whether to enable this feature. This feature is a Huawei-proprietary one. To enable this feature, the MME, MSC, and RNC must be all provided by Huawei and support this feature. No IMS needs to be deployed. When a UE initiates a CS service setup request in an LTE network that does not support VoLTE, this feature enables the eNodeB to hand over the UE to the UTRAN through the SRVCC procedure. The procedure has CS resources on the UTRAN prepared in advance and omits certain protocol-defined signaling procedures during access to the UTRAN, shortening the CSFB delay by 1s and improving user experience significantly. For the detailed signaling procedure, see 13.1.5 Ultra-Flash CSFB to UTRAN. The measurement procedure and blind handling procedure for this feature are the same as those described in 3.2.1 TDLOFD-001033 CS FallBack to UTRAN. NOTE

If a UE does not support ultra-flash CSFB, a UE compatibility issue arises. To address this issue, select the UltraFlashCsfbComOptSw option of the GlobalProcSwitch.UeCompatSwitch parameter.

3.2.4 TDLOFD-001068 CS Fallback with LAI to UTRAN Application Scenarios This section describes the optional feature TDLOFD-001068 CS Fallback with LAI to UTRAN. This feature is under license control but not under switch controll . This feature works in the following scenarios: l

In a multi-PLMN or national roaming scenario An LAI consists of a PLMN ID and a location area code (LAC). The PLMN ID identifies the CS network that a UE has registered with and will fall back to. If the serving E-UTRAN cell has multiple neighboring UTRAN or GERAN cells with different PLMN IDs or the serving PLMN differs from the target PLMN, the operator can use the CSFB with LAI function so that the UE will preferentially fall back to the PLMN indicated by the LAI.

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To prevent a further LAU after CSFB, the eNodeB selects a CSFB target cell with the same LAC as that specified for the UE during attach. Therefore, the CSFB delay does not include the LAU time. The eNodeB derives the LAI from an Initial Context Setup Req or UE Context Mod Req message sent by the MME. This feature is an enhancement to the optional feature TDLOFD-001033 CS Fallback to UTRAN. With this feature, the eNodeB selects frequencies or cells for measurement or blind handling based on LAIs sent by the MME. The following describes target selection for measurement and blind handling.

Handover Measurement l

Selecting frequencies During measurement configuration, the eNodeB selects only inter-RAT frequencies on which the PLMN ID of any neighboring cell is the same as that in the LAI received. The follow-up measurement procedure is similar to that in CS Fallback to UTRAN.

Selecting neighboring cells The eNodeB additionally filters neighboring cells in the following order after receiving measurement reports from a UE: a.

Neighboring cells with PLMN IDs and LACs the same as those in the LAI

Neighboring cells with PLMN IDs the same as that in the LAI but LACs different from that in the LAI

If no frequency or neighboring cell can be selected based on the LAI, the process is the same as that when no LAI is received.

Blind Handling l

Selecting frequencies If no neighboring UTRAN cell is configured, the eNodeB preferentially selects the UTRAN frequencies whose PLMN ID is the same as that in the LAI. For details, see 3.3 Triggering Events. If neighboring UTRAN cells are configured, the eNodeB preferentially selects the operating UTRAN frequencies of the neighboring UTRAN cells whose PLMN ID is the same as that in the LAI. The eNodeB then sorts the frequencies based on the blind handover priorities of the neighboring cells and frequency priorities for connected-mode UEs. For details, see 3.3 Triggering Events.

Selecting neighboring cells The neighboring cell selection sequence is controlled by the LaiCsfbBlindNCellSelSwitch option of the ENodeBAlgoSwitch.HoCommOptSwitch parameter. NOTE

When the coverage of an E-UTRAN cell is not completely included in that of a neighboring cell with a configured blind handover priority, you are advised to select the option, thereby ensuring the CSFB success rate and reducing the delay.

When the option is selected, the selection sequence is as follows:

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Neighboring cells with PLMN IDs the same as those in the LAI

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Neighboring cells with LACs the same as those in the LAI among b

When the option is cleared, the selection sequence is as follows: a.

Neighboring cells with PLMN IDs the same as those in the LAI

Neighboring cells with LACs the same as those in the LAI among a

Neighboring cells with the highest blind-handover priority among b

3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering This section describes the CS steering function in the optional feature TDLOFD-001078 EUTRAN to UTRAN CS/PS Steering. For details about the PS steering function in this feature, see Inter-RAT Mobility Management in Connected Mode Feature Parameter Description. This feature can be used when service steering is required in a UTRAN with multiple UTRAN frequencies. By setting CS service priorities for UTRAN frequencies, the operator can achieve CSFB from E-UTRAN only to the UTRAN frequency that has the highest CS service priority.

CS Steering in CSFB This function is an enhancement to the CS Fallback to UTRAN feature. The enhancements are as follows: l

Frequencies with the highest CS service priority are preferentially selected for inter-RAT measurement on the UTRAN. This function is controlled by the UtranFreqLayerMeasSwitch option of the cell-level parameter CellAlgoSwitch.FreqLayerSwitch. NOTE

This function is also controlled by the UtranFreqLayerMeasSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.FreqLayerSwtich. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

If this option is selected, the eNodeB preferentially selects frequencies with the highest CS service priority specified by the UtranNFreq.CsPriority parameter for measurement. A larger value of this parameter indicates a higher priority. If this parameter is set to Priority_0(Priority 0) for a frequency, the eNodeB does not select this frequency for measurement. The follow-up measurement procedure is the same as that in CS Fallback to UTRAN. For details, see 3.4 Target Cell/Frequency Selection. l

Frequencies with the highest CS service priority are preferentially selected for blind redirection, or cells on frequencies with the highest CS service priority are preferentially selected as the target cells of blind handovers. This function is controlled by the UtranFreqLayerBlindSwitch option of the cell-level parameter CellAlgoSwitch.FreqLayerSwitch.

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NOTE

This function is also controlled by the UtranFreqLayerBlindSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.FreqLayerSwtich. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

If this option is selected, the eNodeB preferentially selects a frequency with the highest CS service priority specified by the UtranNFreq.CsPriority parameter or a cell on the frequency for blind handling. A larger value of this parameter indicates a higher priority. If this parameter is set to Priority_0(Priority 0) for a frequency, this frequency is not involved in frequency prioritization. The follow-up blind handling procedure is the same as that in CS Fallback to UTRAN. For details, see 3.4 Target Cell/Frequency Selection.

LAI-based CS Steering in CSFB This function is an enhancement to the CS Fallback with LAI to UTRAN feature. The enhancements are as follows: l

Enhancement in measurement a.

The eNodeB selects inter-RAT frequencies on which the PLMN ID of a neighboring cell is the same as the PLMN ID in the LAI.

Among the selected frequencies, the eNodeB selects frequencies with the highest CS service priority, which is specified by the UtranNFreq.CsPriority parameter.

The follow-up measurement procedure is the same as that in CS Fallback to UTRAN. For details, see 3.4 Target Cell/Frequency Selection.

The difference is that the eNodeB additionally sorts neighboring cells in the following order after receiving measurement reports from a UE:

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Neighboring cells with PLMN IDs and LACs the same as those in the LAI

Neighboring cells with PLMN IDs the same as that in the LAI but LACs different from that in the LAI

Neighboring cells with PLMN IDs the same as the serving PLMN ID of the UE

Enhancement in blind handling a.

The eNodeB selects frequencies whose PLMN ID is the same as the PLMN ID in the LAI.

Among the selected frequencies, the eNodeB selects frequencies with the highest CS service priority, which is specified by the UtranNFreq.CsPriority parameter.

The eNodeB selects a neighboring cell whose PLMN ID and LAC are the same as those in the LAI.

If such a neighboring cell is unavailable, the eNodeB selects a neighboring cell whose PLMN ID is the same as that in the LAI but LAC is different from that in the LAI.

The follow-up blind handling procedure is the same as that in CS Fallback to UTRAN. For details, see 3.4 Target Cell/Frequency Selection.

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3.2.6 TDLOFD-001088 CS Fallback Steering to UTRAN This section describes the optional feature TDLOFD-001088 CS Fallback Steering to UTRAN. This feature is controlled by the UtranCsfbSteeringSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. NOTE

This feature is also controlled by the UtranCsfbSteeringSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

This feature is an enhancement to the optional feature TDLOFD-001033 CS Fallback to UTRAN. Operators can set target RATs for UEs in different states at the time when the UEs initiate CS services. There are two types of UEs: l

CS-only UE If the MME uses an INITIAL CONTEXT SETUP REQUEST message to send a CS Fallback Indicator to the eNodeB, the eNodeB determines that the UE is in idle mode when initiating the CS service. This UE is called a CS-only UE.

CS+PS UE If the MME uses a UE CONTEXT MODIFICATION REQUEST message to send a CS Fallback Indicator to the eNodeB, the eNodeB determines that the UE is performing PS services when initiating the CS service. This UE is called a CS+PS UE.

CS-Only UE The eNodeB selects the target RAT based on the RAT priorities specified by the parameters in Table 3-1. Table 3-1 Target RAT priority parameter list for CSFB of CS-only UEs

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Target RAT Priority for CSFB of CS-only UEs

eNodeB-Level Parameter

Cell-Level Parameter

CSFB Highest priority InterRat for Idle UE

CSFallBackBlindHoCfg.IdleCsfbHighest Pri

CellOpHoCfg.IdleCsfbHig hestPri

CSFB Second priority InterRat for Idle UE

CSFallBackBlindHoCfg.IdleCsfbSecond Pri

CellOpHoCfg.IdleCsfbSec ondPri

CSFB Lowest priority InterRat for Idle UE

CSFallBackBlindHoCfg.IdleCsfbLowest Pri

CellOpHoCfg.IdleCsfbLow estPri

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NOTE

Parameters in the CSFallBackBlindHoCfg MO are eNodeB-level. When you run ADD CNoperator with CnOperatorId configured to add an operator, parameters in the CSFallBackBlindHoCfg MO are automatically set to default values. Cell-level parameters for inter-RAT handovers are configured by running ADD CELLOPHOCFG. When both CSFallBackBlindHoCfg and CellOpHoCfg are configured, CellOpHoCfg prevails.

The eNodeB can select a neighboring cell or frequency with a lower-priority RAT only if no neighboring cell or frequency with higher-priority RATs is configured. If UTRAN is assigned the highest RAT priority, the eNodeB selects target frequencies based on the setting of the UtranNFreq.CsPriority parameter. For details, see 3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering. The eNodeB selects the handover policy for CSFB of CS-only UEs based on the setting of the CSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter. PS handover takes priority over redirection.

CS+PS UE If the UE is a CS+PS UE, the eNodeB selects the target RAT based on the RAT priorities specified by the parameters in Table 3-2. Table 3-2 Target RAT priority parameter list for CSFB of CS+PS UEs Target RAT Priority for CSFB of CS+PS UEs

eNodeB-Level Parameter

Cell-Level Parameter

Highest priority InterRat

CSFallBackBlindHoCfg.InterRatHighestPri

CellOpHoCfg.InterRatHig hestPri

Second priority InterRat

CSFallBackBlindHoCfg.InterRatSecondP ri

CellOpHoCfg.InterRatSec ondPri

Lowest priority InterRat

CSFallBackBlindHoCfg.InterRatLowestP ri

CellOpHoCfg.InterRatLow estPri

The eNodeB can select a neighboring cell or frequency with a lower-priority RAT only if no neighboring cell or frequency with higher-priority RATs is configured. If UTRAN is assigned the highest RAT priority, the eNodeB selects target frequencies based on the setting of the UtranNFreq.CsPsMixedPriority parameter. The UtranNFreq.CsPsMixedPriority and UtranNFreq.CsPriority parameters have similar setting principles. For details, see 3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering. The eNodeB selects the handover policy for CSFB based on the setting of the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter. PS HO and redirection are selected in descending order. Issue 02 (2016-04-20)

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3.2.7 Load-based CSFB to UTRAN This section describes load-based CSFB to UTRAN. This function is an enhancement to the CS Fallback to UTRAN feature. The CSFBLoadInfoSwitch option of the ENodeBAlgoSwitch.HoAlgoSwitch parameter specifies whether to enable this function. In load-based CSFB to UTRAN, the eNodeB uses the RIM procedure in Multiple Report mode to obtain the load information about UTRAN cells. For details about the RIM procedure, see 3.7 RIM Procedure Between E-UTRAN and UTRAN. After receiving the load information about UTRAN cells, the eNodeB saves the information and uses the information to determine the target UTRAN cell for the CSFB. In load-based CSFB to UTRAN, the measurement and blind handover procedures are the same as those in the CS Fallback to UTRAN feature. For details, see 3.2.1 TDLOFD-001033 CS FallBack to UTRAN. When selecting a target cell for CSFB to UTRAN, the eNodeB considers UTRAN cells in the following priority order of load status: normal, congested, and overloaded. Load-based CSFB to UTRAN affects the target cell selection at a later phase. In the measurement phase, if necessary, cell load status does not affect frequency selection: The eNodeB does not select a low-priority frequency because all UTRAN cells on a high-priority frequency are overloaded.

3.3 Triggering Events CSFB triggering is classified into measurement triggering and blind handling triggering.

Measurement Triggering During CSFB, the eNodeB starts UTRAN measurements after it receives a CS Fallback Indicator. The measurement configuration procedure is the same as that for coverage-based handovers from E-UTRAN to UTRAN. For details, see Inter-RAT Mobility Management in Connected Mode. They have different thresholds and time-to-trigger. Table 3-3 lists the thresholds and time-totrigger related to event B1 for CSFB to UTRAN. Other parameters are the same as those related to event B1 for coverage-based inter-frequency handovers. Table 3-3 Parameters related to event B1 for CSFB to UTRAN

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Parameter Name

Parameter ID

Parameter Description

CSFB UTRAN EventB1 RSCP Trigger Threshold

CSFallBackHo.CsfbHo UtranB1ThdRscp

CSFB UTRAN EventB1 ECN0 Trigger Threshold

CSFallBackHo.CsfbHo UtranB1ThdEcn0

The InterRatHoComm.InterRATHoUt ranB1MeasQuan parameter determines which threshold is to be used.

CSFB Utran EventB1 Time To Trig

CSFallBackHo.CsfbHo UtranTimeToTrig

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Blind Handling Triggering Blind handling is controlled by the following two options. The blind handling function takes effect only when both options are selected. l

BlindHoSwitch of the eNodeB-level ENodeBAlgoSwitch.HoModeSwitch parameter

BlindHoSwitch of the cell-level CellHoParaCfg.HoModeSwitch parameter

After ultra-flash CSFB to UTRAN or GERAN is enabled and the blind handling function takes effect, the eNodeB performs further operations on UEs supporting ultra-flash CSFB based on the UFCsfbBlindHoDisSwitch option of the CellHoParaCfg.HoModeSwitch parameter. l

If this option is selected, the blind handling function for UEs supporting ultra-flash CSFB does not take effect. Therefore, the eNodeB performs a measurement-based CSFB procedure for the UEs.

If this option is cleared, the eNodeB performs a blind-handling-based CSFB procedure for the UEs supporting ultra-flash CSFB.

When an E-UTRAN coverage area is larger than a UTRAN coverage area and E-UTRAN and UTRAN base stations are co-sited, adaptive blind handover for CSFB can be used. It It estimates the signal strength of the neighboring UTRAN cell based on the signal strength of the serving E-UTRAN cell. The estimation result determines the type of handover. l

If the UE is located in the center of the E-UTRAN cell, the eNodeB performs a blind handling.

If the UE is located at the edge of the E-UTRAN cell, the eNodeB performs a measurement before the CSFB decision.

When the blind handling function is enabled: l

If adaptive blind handover for CSFB is disabled, the eNodeB enters the blind handling procedure.

If adaptive blind handover for CSFB is enabled, the eNodeB delivers the event A1related measurement configuration after CSFB is started. –

If the eNodeB receives an event A1 report, it determines that the UE is located in the center of the E-UTRAN cell. A blind handling procedure starts.

–

If the eNodeB does not receive an event A1 report, it determines that the UE is located at the edge of the E-UTRAN cell. A measurement procedure starts.

The threshold for event A1 is specified by the CSFallBackHo.BlindHoA1ThdRsrp parameter, and other event-A1-related principles are the same as these in coverage-based handover from E-UTRAN to UTRAN. For details, see Inter-RAT Mobility Management in Connected Mode Feature Parameter Description.

3.4 Target Cell/Frequency Selection Measurement Object Selection The selection procedure is as follows: 1.

The eNodeB selects the target RAT. –

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frequencies of the highest-priority RAT. For example, if the CSFallBackBlindHoCfg.IdleCsfbHighestPri parameter is set to UTRAN, the eNodeB selects only UTRAN frequencies for measurement. – 2.

If CS Fallback Steering to UTRAN and CS Fallback Steering to GERAN are disabled, the eNodeB selects all frequencies for measurement.

The eNodeB filters frequencies and neighboring cells. When selecting frequencies of a target RAT for measurement, the eNodeB filters the frequencies configured on it. It filters out the frequencies not supported by the UE and then filters out the following neighboring cells on the remaining frequencies:

–

Blacklisted neighboring cells

–

Neighboring cells to which handovers are prohibited as indicated by the No handover indicator parameter for cells in neighboring cell lists

–

Neighboring cells with different PLMN IDs from the serving cell in neighboring cell lists (If the inter-PLMN handover switch is on, the eNodeB does not filter out these neighboring cells.)

–

Cells to which handovers are prohibited as indicated by the Handover Restriction List IE in the INITIAL CONTEXT SETUP REQUEST message sent from the MME

The eNodeB selects cells to measure. Figure 3-2 shows the selection procedure. Figure 3-2 Procedure for selecting cells to measure

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The procedure shown in Figure 3-2 involves the following data configuration and activities: –

Neighboring UTRAN frequencies are configured in UtranNFreq MOs.

–

The CS service priority is specified by the UtranNFreq.CsPriority or UtranNFreq.CsPsMixedPriority parameter. For details about this parameter, see 3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering and 3.2.6 TDLOFD-001088 CS Fallback Steering to UTRAN.

–

The priorities of neighboring UTRAN frequencies for connected-mode UEs are specified by the UtranNFreq.ConnFreqPriority parameter.

–

The measurement priority for neighboring UTRAN cells can be automatically optimized by ANR. The UTRAN_SWITCH option of the ENodeBAlgoSwitch.NCellRankingSwitch parameter controls the automatic optimization function. It is recommended that this option be selected only if ANR is enabled. n

If this option is selected, the eNodeB automatically optimizes the UtranNCell.NCellMeasPriority parameter for neighboring UTRAN cells. This parameter cannot be modified manually. For details, see ANR Management Feature Parameter Description.

If this option is deselected, the measurement priority is specified by the UtranNCell.CellMeasPriority parameter, which must be configured manually.

–

When the eNodeB selects highest-priority frequencies or cells, the number of frequencies or cells selected is equal to the number of candidates if the number does not exceed the maximum permissible number. If the number of candidates exceeds the maximum permissible number, the eNodeB randomly selects the maximum permissible number of frequencies or cells from the candidates.

–

The maximum permissible number of frequencies is specified by the CellUeMeasControlCfg.MaxUtranTddMeasFreqNum parameter.

–

The maximum permissible number of neighboring cells is defined in section 6.4 "RRC multiplicity and type constraint values" of 3GPP TS 36.331 V10.1.0.

Blind Handling Target Selection The selection procedure is as follows: 1.

The eNodeB selects the target RAT. During blind handling for CSFB, the eNodeB selects the target RAT based on the RAT priorities specified by the parameters in Table 3-4. If both eNodeB- and cell-level parameters are set, the cell-level parameter settings prevail. Table 3-4 RAT priority parameters

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RAT Priority

eNodeB-Level Parameter

Cell-Level Parameter

Highest priority InterRat

CSFallBackBlindHoCfg.InterRatHighestPri

CellOpHoCfg.InterRatHi ghestPri

Second priority InterRat

CSFallBackBlindHoCfg.InterRatSecondPri

CellOpHoCfg.InterRatSe condPri

Lowest priority InterRat

CSFallBackBlindHoCfg.InterRatLowestPri

CellOpHoCfg.InterRatLo westPri

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If CSFallBackBlindHoCfg.InterRatHighestPri or CellOpHoCfg.InterRatHighestPri is set to UTRAN, the eNodeB performs CSFB to UTRAN. 2.

The eNodeB filters frequencies and cells. During target selection, the eNodeB filters the frequencies configured on it. It filters out the frequencies not supported by the UE and then filters out the following neighboring cells on the remaining frequencies:

–

Blacklisted neighboring cells

–

Neighboring cells to which handovers are prohibited as indicated by the No handover indicator parameter for cells in neighboring cell lists

–

Neighboring cells with different PLMN IDs from the serving cell in neighboring cell lists (If the inter-PLMN handover switch is on, the eNodeB does not filter out these neighboring cells.)

–

Cells to which handovers are prohibited as indicated by the Handover Restriction List IE in the INITIAL CONTEXT SETUP REQUEST message sent from the MME

The eNodeB selects the target cell or frequency. –

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Before the eNodeB can select a cell as the target cell for the blind handover from EUTRAN to UTRAN, the neighboring UTRAN cell must be configured on the eNodeB and be assigned a blind-handover priority. Figure 3-3 shows the procedure for selecting the target cell for a blind handover.

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Figure 3-3 Target cell selection for a blind handover

The procedure shown in Figure 3-3 involves the following data configuration and activities:

â&#x20AC;&#x201C;

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Neighboring UTRAN cells are configured in UtranNCell MOs.

The blind-handover priorities of neighboring UTRAN cells are specified by the UtranNCell.BlindHoPriority parameter.

If there is more than one highest-priority frequency or neighboring cell, the eNodeB randomly selects one.

Before the blind redirection from E-UTRAN to UTRAN, neighboring UTRAN frequencies and their priorities for connected-mode UEs must be configured. Neighboring UTRAN cell configurations are not required. Figure 3-4 shows the procedure for selecting the target frequency for blind redirection.

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Figure 3-4 Target frequency selection for blind redirection

The procedure shown in Figure 3-4 involves the following data configuration and activities:

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Neighboring UTRAN frequencies are configured in UtranNFreq MOs.

The priorities of neighboring UTRAN frequencies for connected-mode UEs are specified by the UtranNFreq.ConnFreqPriority parameter.

Neighboring UTRAN cells are configured in UtranNCell MOs.

The eNodeB selects a frequency from the candidates based on blind-handover priorities of neighboring cells as follows: ○

If neighboring cells are assigned non-zero blind-handover priorities, which is specified by UtranNCell.BlindHoPriority, the eNodeB selects the operating frequency of the cell with the highest blind-handover priority.

○

If all neighboring cells are assigned blind-handover priority 0, the eNodeB considers frequency priorities for connected-mode UEs It

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preferentially selects the frequency with the highest priority for connected-mode UEs. n

The PLMN information about neighboring UTRAN frequencies is contained in UtranRanShare or UtranExternalCell MOs.

If there is more than one highest-priority frequency or cell, the eNodeB randomly selects one.

3.5 Decision In the decision phase, the eNodeB checks the candidate cell list. Based on the check result, the eNodeB determines whether a CSFB needs to be initiated and, if so, to which cell the UE is to be fallen back to. The candidate cell list generated for CSFB is controlled by the CellHoParaCfg.L2UCsfbMRProMode parameter. This parameter has three values: HANDOVERIMMEDIATELY, BASEDONSIGNALSTRENGTH, and BASEDONFREQPRIORITY. Figure 3-5 shows the candidate cell list generation procedure when parameter configurations are different.

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Figure 3-5 Candidate cell list generation procedure

As shown in Figure 3-5, the CellHoParaCfg.CsfbMRWaitingTimer parameter specifies the timer for candidate cell list generation during CSFB. When a candidate cell based on BASEDONSIGNALSTRENGTH or BASEDONFREQPRIORITY is selected and the subsequent handover preparation fails, the eNodeB no longer starts the timer to wait but performs the decision immediately after receiving the measurement report.

3.5.1 Basic Decision Method When the CSFB policy is PS handover, SRVCC, or redirection (excluding flash redirection), the eNodeB uses the basic decision method, with no need to obtain system information of the peer. In the decision phase, the eNodeB checks the candidate cell list. Based on the check result, the eNodeB determines whether a CSFB needs to be initiated and, if so, to which cell the UE is to be fallen back to. If the eNodeB receives measurement reports about different RATs, it handles the reports in a first-in first-out manner. Issue 02 (2016-04-20)

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The eNodeB sends a handover request to the target cell. If the handover request fails, the eNodeB sends the handover request to the next target cell, as described in Table 3-5. Table 3-5 Sequence of handover requests to be sent by the eNodeB Candidate Cell List Generated by

Sequence of Handover Requests

Measurement

A handover request is sent to the cell with the best signal quality.

Blind handover

A handover request is sent to a cell or frequency that has the highest priority. If multiple cells have the highest priority, the eNodeB randomly selects a cell for blind handover.

If the handover request fails in all candidate cells: l

In a measurement-based handover procedure, the eNodeB waits for a next measurement report from the UE.

In a blind handover procedure, the eNodeB stops the handover attempt.

3.5.2 Decision Based on System Information When the handover policy (for example, flash redirection) requires the eNodeB to obtain system information about the peer, the eNodeB makes a handover decision based on system information. In this phase, the eNodeB delivers system information about cells about the target RAT to the UE. Therefore, the UE does need to read the system information, shortening the delay of access to the target network. Decision based on system information adheres to the following principles: l

In blind handling scenarios: a.

The eNodeB generates a candidate cell list based on the blind-handover priorities of cells on the target frequencies of redirection and then adds other cells on these frequencies to the list. The UTRAN_SWITCH option of the ENodeBAlgoSwitch.NCellRankingSwitch parameter specifies the sequence of adding other cells. If this switch is on, the eNodeB adds other cells on the target frequencies in descending order of UtranNCell.NCellMeasPriority. If this switch is off, the eNodeB adds cells with the highest measurement priority specified by the UtranNCell.CellMeasPriority parameter.

The eNodeB takes the actions described in 3.5.1 Basic Decision Method.

The eNodeB filters out the cells whose system information has not been obtained.

The eNodeB filters cells based on SPID-based mobility management in connected mode. For details, see LOFD-00105401 Camp & Handover Based on SPID in Flexible User Steering Feature Parameter Description.

In measurement scenarios: a.

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The UTRAN_SWITCH option of the ENodeBAlgoSwitch.NCellRankingSwitch parameter specifies the sequence of adding other cells. b.

The eNodeB takes the actions described in 3.5.1 Basic Decision Method.

The eNodeB filters out the cells whose system information has not been obtained.

Operators can set the InterRatHoComm.CellInfoMaxUtranCellNum parameter to specify the maximum permissible number of UTRAN cells contained in a redirection message. Assume that this parameter is set to N. l

If the number of target cells in the filtering result is greater than N, the eNodeB selects the first N cells.

If the number of target cells in the filtering result is smaller than N, the eNodeB selects all these cells.

The eNodeB obtains system information about target cells through the RIM procedure. If a target cell does not support the RIM procedure, the eNodeB cannot obtain system information about that cell.

3.6 Execution In the execution phase, the eNodeB controls the fallback of the UE from the source cell to the target cell or frequency.

3.6.1 CSFB Policy Selection CSFB from E-UTRAN to UTRAN can be based on PS handover, redirection, or flash redirection, as shown in Figure 3-6. This policy selection procedure is based on the assumption that neighboring frequencies and cells have been configured appropriately.

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Figure 3-6 EUTRAN-to-UTRAN CSFB policy selection procedure

The CSFB policy is determined by different parameters, depending on whether TDLOFD-001088 CS Fallback Steering to UTRAN is enabled. l

If this feature is enabled: –

The CSFB policy for UEs in idle mode is specified by the CSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter.

–

The CSFB policy for UEs in connected mode is specified by the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter.

If this feature is disabled, the CSFB policy is specified by the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter, regardless of whether UEs are in idle or connected mode.

The parameters in Figure 3-6 are described as follows: Issue 02 (2016-04-20)

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If blind redirection for CSFB is required, select the REDIRECTION option of the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter.

The CSFB protection timer is specified by the CSFallBackHo.CsfbProtectionTimer parameter. If the UE does not send inter-RAT measurement reports and stays in the area covered by the eNodeB when the timer expires, the eNodeB performs redirection for CSFB. –

The eNodeB preferentially selects a system that the UE has not measured. For example, if the UE has measured the UTRAN, the eNodeB preferentially selects the GERAN for redirection.

–

The eNodeB preferentially selects the operating frequency of a cell to which the eNodeB has never attempted to hand over the UE as the target frequency for redirection.

–

If there is no target frequency available for redirection, the eNodeB stops the procedure. If flash CSFB is enabled in this situation, redirection performed by the eNodeB is referred to as emergency redirection for CSFB. In this scenario, operators must must set the InterRatHoComm.UtranCellNumForEmcRedirect parameter to specify the maximum number of UTRAN cells that can be included in an emergency redirection message.

The eNodeB selects the target cell for redirection as it does during blind handling. For details about the selection, see 3.4 Target Cell/Frequency Selection. –

Blind handover is controlled by the BlindHoSwitch option in the eNodeB-level parameter ENodeBAlgoSwitch.HoModeSwitch and the BlindHoSwitch option in the cell-level parameter CellHoParaCfg.HoModeSwitch. The blind handover function takes effect only when both options are selected.

–

Adaptive blind handover for CSFB is controlled by the CsfbAdaptiveBlindHoSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. NOTE

This function is also controlled by the CsfbAdaptiveBlindHoSwitch option of the eNodeBlevel parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeBlevel parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

If PS handover for CSFB is required, the UtranPsHoSwitch option of the CellHoParaCfg.HoModeSwitch parameter and the PS_HO option of the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter must be selected. If either option is cleared, PS handover for CSFB does not take effect. The eNodeB selects redirection as the CSFB policy. If redirection does not take effect either, the eNodeB enters the emergency blind redirection procedure when the CSFB protection timer expires. NOTE

This function is also controlled by the UtranPsHoSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoModeSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

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During a blind PS handover for CSFB, if the handover preparation in the target cell with the highest blind handover priority fails, the eNodeB tries the cell with the second highest blind handover priority. The eNodeB can try a maximum of eight cells. If all these cells fail in handover preparation, the eNodeB performs emergency blind redirection.

3.6.2 Redirection-based CSFB Optimization for UEs in Idle Mode Redirection-based CSFB for UEs in idle mode has been optimized to accelerate CSFB by shortening end-to-end delay and to reduce the CSFB failure rate due to initial context setup failures. An eNodeB evaluates whether to perform the optimized redirection procedure after it determines to perform a blind handover, as shown in Figure 3-7. Figure 3-7 Redirection-based CSFB optimization for UEs in idle mode

The optimization is controlled by the IdleCsfbRedirectOptSwitch option of the GlobalProcSwitch.ProtocolMsgOptSwitch parameter. For details about how to decide between redirection and flash redirection, see 3.6.1 CSFB Policy Selection. Issue 02 (2016-04-20)

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For details about the signaling procedure for redirection-based CSFB optimization for UEs in idle mode, see 13.1.6 Redirection-based CSFB Optimization for UEs in Idle Mode. NOTE

When the optimization switch is turned on and CSFB with LAI to UTRAN or GERAN is enabled, it is recommended that the RsvdSwPara1_bit25 option of the ENBRsvdPara.RsvdSwPara1 parameter be selected to prevent function conflicts.

3.6.3 CSFB Admission Optimization for UEs in Idle Mode A UE in idle mode only has a default bearer for data service, and the allocation/retention priority (ARP) of the default bearer is generally lower. At CSFB to a cell that is congested or cannot accommodate more UEs, this UE cannot preempt resources in the target cell. To increase the CSFB success rate in this scenario, the eNodeB can preferentially admit CSFB UEs. This function is controlled by the CSFallBackPolicyCfg.CsfbUserArpCfgSwitch parameter. A larger value of the CsFallbackPolicyCfg.NormalCsfbUserArp parameter indicates a higher probability that UEs in idle mode are admitted to target cells for CSFB. For details about the admission procedure, see Admission and Congestion Control .

3.6.4 Retry and Penalty For CSFB to UTRAN based on PS handover, after the eNodeB sends a handover request to the target cell and admission failure, including resource admission failure and non-resource admission failure, occurs, the eNodeB imposes a penalty on the target cell. During the penalty period, the eNodeB does not allow UEs to be handed over to the target cell, avoiding unnecessary handover request signaling and increasing the handover preparation failure rate. After the penalty period, if the target cell meets handover requirements, the eNodeB retries the handover request to the target cell. For details about the penalty and retry, see Intra-RAT Mobility Management in Connected Mode Feature Parameter Description. If the emergency blind redirection procedure for CSFB is triggered, the eNodeB does not consider whether the target cell is penalized during target cell selection.

3.7 RIM Procedure Between E-UTRAN and UTRAN The RIM procedure exchanges information between the E-UTRAN and UTRAN. In CSFB procedures, an eNodeB obtains the load information of external UTRAN cells from RNCs through the RIM procedure. When the GlobalProcSwitch.UtranLoadTransChan parameter is set to BASED_ON_RIM, the eNodeB obtains UTRAN cell load information through the RIM procedure for target cell selection. In flash CSFB procedures, an eNodeB obtains the system information (SI) of UTRAN cells from RNCs through the RIM procedure. The RIM procedure may use one of the following information exchange modes: l

Single Report In Single Report mode, the source sends a request, and then the target responds with a single report.

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When flash CSFB to UTRAN is activated, the eNodeB sends a RIM request to the RNC and then includes the obtained SI in a redirection message to the UE. If the eNodeB fails to obtain SI from the RNC, the eNodeB no longer sends the RIM request. l

Multiple Report Currently, the eNodeB triggers a RIM procedure in Multiple Report mode only if MMEs comply with 3GPP Release 9 or later. In Multiple Report mode, the target responds with a report after receiving a request from the source, and the target also sends a report to the source each time information about the target changes. When flash CSFB to UTRAN is enabled, the eNodeB sends RIM requests to all neighboring UTRAN cells every 4 seconds no matter whether the eNodeB has CSFB services. To ensure that the SI of a UTRAN neighboring cell can be obtained successfully, the eNodeB starts a 4s timer when it sends a RIM request. –

If the eNodeB receives a response to the RIM request before the timer expires, the eNodeB saves the obtained SI.

–

If the eNodeB receives a response to the RIM request after the timer expires, the eNodeB considers that an exception has occurred and discards the SI.

–

If the eNodeB does not receive a response to the RIM request even after the timer expires, the eNodeB sends the RIM request and starts the timer again (called a retry) 2 hours later. If the eNodeB still does not receive a response after 10 retries, the RIM request fails. The interval between the nth and (n-1)th retries is twice the number of the retries n. For example, the first retry occurs 2 hours after the first SI acquisition fails, the second retry occurs 4 hours after the first retry fails, and the third retry occurs 6 hours after the second retry fails. For each retry, the eNodeB sends a RIM request and restarts the timer.

The eNodeB may obtain incorrect SI due to errors in the UTRAN, core network, or transport network. To avoid this situation, the eNodeB randomly selects a time point every day from 02:00 a.m. to 04:00 a.m and deletes all the obtained SI. Then, the eNodeB requests the SI of UTRAN cells through the RIM procedure again. If a neighboring UTRAN cell is faulty or deactivated, the RNC sends the eNodeB an END message, instructing the eNodeB to stop the RIM procedure. The eNodeB then deletes the obtained SI and requests SI again in the next RIM procedure. The RIM procedure can be performed through the core network or eCoordinator.

3.7.1 RIM Procedure Through the Core Network If ENodeBAlgoSwitch.RimOnEcoSwitch is set to OFF(Off), the RIM procedure is performed through the core network. As shown in Figure 3-8, the RIM procedure involves the eNodeB, MME, SGSN, and RNC Among these NEs, the MME and the SGSN transfer but do not interpret information. For details, see section 8c "Signalling procedures between RIM SAPs" in 3GPP TS 48.018 V10.0.0.

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Figure 3-8 RIM procedure through the core network

In Figure 3-9: l

The UTRAN_RIM_SWITCH option of the ENodeBAlgoSwitch.RimSwitch parameter controls the RIM procedure between E-UTRAN and UTRAN. If this option is selected, the eNodeB uses the RIM procedure in Multiple Report mode to obtain the SI of external UTRAN cells.

The UtranSepOpMobilitySwitch option of the ENodeBAlgoSwitch.MultiOpCtrlSwitch parameter specifies whether UTRAN operators can use different mobility policies.

The UtranNetworkCapCfg.NetworkCapCfg parameter specify the capability of SI acquisition through RIM. If the capability is not configured for an operator or RNC, it is supported by default.

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Figure 3-9 Information exchange mode selection for the RIM procedure

3.7.2 RIM Procedure Through the eCoordinator If ENodeBAlgoSwitch.RimOnEcoSwitch is set to ON(On), the RIM procedure is performed through the eCoordinator. As shown in Figure 3-10, the RIM procedure through the eCoordinator involves the eNodeB, eCoordinator, and RNC. Among these NEs, the eCoordinator transfers but does not interpret information. Figure 3-10 RIM procedure through the eCoordinator

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The RIM procedure through the eCoordinator requires that the corresponding switches of this function be on at all these NEs. During this RIM procedure, each NE does not send RIM messages to the core network or process RIM messages from the core network. The information exchange mode for the eCoordinator-based RIM procedure is controlled by UTRAN_RIM_SWITCH of the ENodeBAlgoSwitch.RimSwitch parameter. l

If this switch is on, the eNodeB uses the RIM procedure in Multiple Report mode to obtain the SI of external UTRAN cells.

If this switch is off, the eNodeB uses the RIM procedure in Single Report mode.

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CSFB to GERAN

This chapter describes each CSFB to GERAN feature, CSFB procedure, and RIM procedure between E-UTRAN and GERAN.

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eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

4.1 Overview CSFB to GERAN can be implemented in different ways, and this chapter covers the following features: l

TDLOFD-001034 CS Fallback to GERAN

TDLOFD-001053 Flash CS Fallback to GERAN

TDOFD-001069 CS Fallback with LAI to GERAN

TDLOFD-001089 CS Fallback Steering to GERAN

TDLOFD-081203 Ultra-Flash CSFB to GERAN

Figure 4-1 shows the CSFB to GERAN procedure. Figure 4-1 CSFB to GERAN procedure

4.2 Feature Description 4.2.1 TDLOFD-001034 CS Fallback to GERAN This section describes the optional feature TDLOFD-001034 CS Fallback to GERAN. This feature is controlled by the GeranCsfbSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. Issue 02 (2016-04-20)

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eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

NOTE

This feature is also controlled by the GeranCsfbSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

This feature has the same principles as CS Fallback to UTRAN, except the preceding parameters. For details about the principles, see 3.2.1 TDLOFD-001033 CS FallBack to UTRAN.

Handover Measurement The frequency priority used during target frequency selection is specified by the GeranNfreqGroup.ConnFreqPriority parameter. A larger value indicates a higher priority. During the GERAN frequency selection for measurement that is different from the UTRAN frequency selection, if the total number of the GERAN frequencies that can be delivered in the frequency group with the highest priority and the frequencies that have been delivered exceeds the allowed maximum number 32, all frequencies in this frequency group cannot be delivered. The eNodeB determines whether the GERAN frequencies in the frequency group with the second highest priority can be delivered until the number of delivered frequencies is less than or equal to the maximum number of GERAN frequencies allowed for measurement or all frequency groups are determined. In GERAN, no cell measurement priority is configured. If the number of cells working on a frequency exceeds the specification, the eNodeB randomly measures certain cells.

Blind Handling If the eNodeB-level CSFallBackBlindHoCfg.InterRatHighestPri parameter or cell-level CellOpHoCfg.InterRatHighestPri parameter is set to GERAN(GERAN), the eNodeB performs CSFB to GERAN. In case that both eNodeB- and cell-level parameters are configured, the cell-level parameter settings prevail. During blind handling, the target RAT selection procedure is different, depending on whether neighboring GERAN cells are configured. l

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If neighboring GERAN cells are configured: –

The blind handover priority of a GERAN neighboring cell is specified by the GeranNcell.BlindHoPriority parameter. A larger value indicates a higher priority.

–

The GERAN frequency group with the highest priority (specified by the GeranNfreqGroup.ConnFreqPriority parameter) is selected for blind handling. A larger value indicates a higher priority.

–

If the priorities of neighboring cells or frequencies are the same, the eNodeB randomly selects a target cell or frequency. Due to uncertainty of random selection, you are not advised to set the priorities to the same to ensure the blind handover success.

If no neighboring GERAN cell is configured: –

Neighboring GERAN frequencies are configured in GeranNfreqGroup MOs.

–

The PLMN information of the neighboring GERAN frequency is contained in the configured GeranRanShare or GeranExternalCell MOs. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

4.2.2 TDLOFD-001053 Flash CSFB to GERAN This section describes the optional feature TDLOFD-001053 Flash CSFB to GERAN. This feature is controlled by the GeranFlashCsfbSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. NOTE

This feature is also controlled by the GeranFlashCsfbSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

This feature is an enhancement to the optional feature TDLOFD-001034 CS Fallback to GERAN. After this feature is activated, the eNodeB obtains the system information of GERAN cells through the RIM procedure and then sends UEs the EUTRAN-to-GERAN redirection messages that contain the system information. The InterRatHoComm.CellInfoMaxGeranCellNum parameter specifies the maximum number of GERAN cells that can be contained in a redirection message. With this feature, UEs access the GERAN cells with no need to read the system information in the cells. This reduces the access delay. For details about how the GERAN sends the system information to the eNodeB through RIM procedures, see Interoperability Between GSM and LTE. This feature has the same principles as Flash CS Fallback to UTRAN. For details, see 3.2.2 TDLOFD-001052 Flash CS Fallback to UTRAN.

4.2.3 TDLOFD-001069 CS Fallback with LAI to GERAN This section describes the optional feature TDLOFD-001069 CS Fallback with LAI to GERAN. This feature is under license control but not under switch control. This feature has the same principles as CS Fallback with LAI to UTRAN. For details, see 3.2.4 TDLOFD-001068 CS Fallback with LAI to UTRAN.

4.2.4 TDLOFD-001089 CS Fallback Steering to GERAN This section describes the optional feature TDLOFD-001089 CS Fallback Steering to GERAN. This feature is controlled by the GeranCsfbSteeringSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. NOTE

This feature is also controlled by the GeranCsfbSteeringSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

The principles of this feature are similar to the principles of the CS Fallback Steering to UTRAN feature. For details about the principles, see 3.2.6 TDLOFD-001088 CS Fallback Steering to UTRAN. Issue 02 (2016-04-20)

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eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

The eNodeB selects a handover policy for CSFB of a CS-only UE based on the setting of the CSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter. The eNodeB selects PS handover, CCO, or redirection in descending order of priority. The eNodeB selects a handover policy for CSFB of a CS+PS UE based on the setting of the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter. The eNodeB selects PS handover, CCO, or redirection in descending order of priority.

4.2.5 TDLOFD-081203 Ultra-Flash CSFB to GERAN This section describes the optional feature TDLOFD-081203 Ultra-Flash CSFB to GERAN. The GeranUltraFlashCsfbSwitch option of the ENodeBAlgoSwitch.HoAlgoSwitch parameter specifies whether to enable this feature. This feature is a Huawei-proprietary one. To enable this feature, the MME, MSC, and eNodeB must be all provided by Huawei and support this feature. No IMS needs to be deployed. When a UE initiates a CS service setup request in an LTE network that does not support VoLTE, this feature enables the eNodeB to hand over the UE to the GERAN through the SRVCC procedure. The procedure has CS resources on the GERAN prepared in advance and omits certain protocol-defined signaling procedures during access to the GERAN, shortening the CSFB delay by 2s. For the detailed signaling procedure, see 13.2.6 Ultra-Flash CSFB to GERAN. The measurement procedure and blind handling procedure for this feature are the same as those described in 3.2.1 TDLOFD-001033 CS FallBack to UTRAN. This feature works when external GERAN cells support it. l

If all external GERAN cells support this feature, no configuration on the eNodeB is required.

If some external GERAN cells do not support ultra-flash CSFB to GERAN, the following configurations are required: –

Set UltraFlashCsfbInd to BOOLEAN_FALSE for external GERAN cells that do not support ultra-flash CSFB to GERAN.

–

The ultra-flash CSFB to GERAN capability for external GERAN cells is specified by the GeranExternalCell.UltraFlashCsfbInd parameter.

If the Fast Return to LTE feature is enabled on the GERAN side, the UE can quickly return to the E-UTRAN when it completes the voice service on the GERAN. To achieve this, the Channel Release message must contain E-UTRA frequency information, based on which the UE selects a suitable E-UTRAN cell to camp on. When IratMeasCfgTransSwitch under the GlobalProcSwitch.ProtocolMsgOptSwitch parameter is on, the eNodeB filters E-UTRA frequencies supported by the UE based on the UE capability to obtain a frequency set. During the SRVCC procedure, the eNodeB sends the target BSC a Handover Required message containing the frequency set, which serves as a reference for the fast return procedure. If the CellDrxPara.DrxForMeasSwitch parameter is set to ON(On), the eNodeB delivers the DRX and gap-assisted measurement configurations if the following conditions are met. In the following scenarios, the UE performs measurements preferentially in consecutive sections of sleep time in DRX to accelerate the measurements and decrease the delay. l

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The UE cannot autonomously perform gap-assisted measurements. In this case, the AutoGapSwitch option of the ENodeBAlgoSwitch.HoModeSwitch parameter is deselected or the interRAT-NeedForGaps IE for the GSM frequency is TRUE in the UE capability message. Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

The UE supports DRX.

The BlindHoSwitch option of the ENodeBAlgoSwitch.HoModeSwitch parameter is cleared or the following conditions are met: –

The BlindHoSwitch option of the ENodeBAlgoSwitch.HoModeSwitch parameter is selected.

–

The BlindHoSwitch option of the CellHoParaCfg.HoModeSwitch parameter is selected.

–

The UFCsfbBlindHoDisSwitch option of the CellHoParaCfg.HoModeSwitch parameter is selected.

To increase the probability of the UE entering sleep time, set DRX parameters to achieve a longer sleep time. However, this setting affects scheduling and therefore decreases cell throughput. For details about how to configure measurement-specific DRX parameters, see DRX and Signaling Control. NOTE

If a UE does not support ultra-flash CSFB, a UE compatibility issue arises. To address this issue, select the UltraFlashCsfbComOptSw option of the GlobalProcSwitch.UeCompatSwitch parameter.

4.3 Triggering CSFB triggering is classified into measurement triggering and blind handling triggering. For details, see 3.3 Triggering Events. When the CSFB_MEAS_DEL_INTERFREQ_SW option of the CellAlgoSwitch.MeasOptAlgoSwitch parameter is selected, the eNodeB implements the following optimization for measurement: l

When the GSM measurement is triggered by CSFB, the eNodeB releases all the interfrequency measurement.

After the GSM measurement is triggered by CSFB, starting the inter-frequency measurement is forbidden.

4.4 Target Cell/Frequency Selection Measurement Object Selection The frequency priority used during measurement object selection is specified by the GeranNfreqGroup.ConnFreqPriority parameter. A larger value indicates a higher priority. Unlike the UTRAN frequency selection, in the GERAN frequency selection, if the total number of GERAN frequencies in the highest-priority frequency group to be delivered and frequencies that have been delivered exceeds the maximum number 32, the eNodeB does not deliver any frequency in this group. The eNodeB then evaluates whether to deliver the GERAN frequencies in the frequency group with the second highest priority. The evaluation stops when the number of delivered frequencies is less than or equal to the maximum number or all frequency groups have been evaluated. Issue 02 (2016-04-20)

eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

For CSFB to GERAN, no cell measurement priority is configured. If the number of cells on a frequency exceeds the maximum permissible number, the eNodeB randomly selects cells for measurement.

Blind Handling Target Selection If CSFallBackBlindHoCfg.InterRatHighestPri is set to GERAN(GERAN), the eNodeB performs CSFB to GERAN. The target RAT selection procedure varies depending on whether neighboring GERAN cells have been configured. l

If neighboring GERAN cells have been configured, the eNodeB selects a target cell with the highest blind handover priority or a target frequency group with the highest priority for connected-mode UEs. –

The blind handover priority of a GERAN neighboring cell is specified by the GeranNcell.BlindHoPriority parameter. A larger value indicates a higher priority.

–

The GERAN frequency group priority for connected-mode UEs is specified by the GeranNfreqGroup.ConnFreqPriority parameter. A larger value indicates a higher priority.

–

If neighboring cells or frequencies have the same priority, the eNodeB randomly selects one. To prevent uncertainty of random selection and increase the success rate of blind handovers, you are not advised to set an identical priority for cells or frequencies.

If no neighboring GERAN cell has been configured: –

Neighboring GERAN frequency groups are configured in GeranNfreqGroup MOs.

–

The PLMN information about neighboring GERAN frequencies is contained in the GeranRanShare or GeranExternalCell MOs.

4.5 Decision The decision for CSFB to GERAN is the same as that for CSFB to UTRAN. For details, see 3.5 Decision.

4.6 Execution When a UE in an LTE network needs to perform a voice service but the LTE network does not support VoLTE, a procedure of CSFB to an inter-RAT network is triggered. CSFB from E-UTRAN to GERAN can be based on PS handover, CCO/NACC, redirection, or flash redirection, as shown in Figure 4-2. This policy selection procedure is based on the assumption that neighboring frequencies and cells have been configured appropriately. During a blind PS handover for CSFB, if the handover preparation in the target cell with the highest blind handover priority fails, the eNodeB tries the cell with the second highest blind handover priority. The eNodeB can try a maximum of eight cells. If all these cells fail in handover preparation, the eNodeB performs emergency blind redirection.

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eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

Figure 4-2 EUTRAN-to-GERAN CSFB policy selection procedure

The parameters in Figure 4-2 are described as follows: l

The CSFB protection timer is specified by the CSFallBackHo.CsfbProtectionTimer parameter. If the UE stays in the area covered by the eNodeB when the timer expires, the eNodeB performs redirection for CSFB. –

The eNodeB preferentially selects a system that the UE has not measured. For example, if the UE has measured the UTRAN, the eNodeB preferentially selects the GERAN for redirection.

–

If there is no target frequency available for redirection, the eNodeB stops the procedure. If flash CSFB is enabled in this situation, redirection performed by the eNodeB is referred to as CSFB emergency redirection. For this type of CSFB, you must set the InterRatHoComm.GeranCellNumForEmcRedirect parameter to specify the maximum number of GERAN cells that can be contained in a message delivered to the UE during a CSFB emergency redirection procedure.

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Blind handover is controlled by the BlindHoSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoModeSwitch and the BlindHoSwitch option of the Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

cell-level parameter CellHoParaCfg.HoModeSwitch. The blind handover function takes effect only when both options are selected. l

Adaptive blind handover for CSFB is controlled by the CsfbAdaptiveBlindHoSwitch option of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch. NOTE

This function is also controlled by the CsfbAdaptiveBlindHoSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

The CSFB policies are controlled by the options of the ENodeBAlgoSwitch.HoModeSwitch parameter: –

The PS handover capability is specified by GeranPsHoSwitch.

–

The CCO capability is specified by GeranCcoSwitch.

–

The NACC capability is specified by GeranNaccSwitch.

–

The redirection capability is specified by GeranRedirectSwitch. When CSFB to GERAN is based on CCO with NACC, the eNodeB obtains SI of external cells from RNCs through the RIM procedure. For details about the RIM procedure, see 4.7 RIM Procedure Between E-UTRAN and GERAN.

The CSFB policy is determined by different parameters, depending on whether TDLOFD-001089 CS Fallback Steering to GERAN is enabled. If this feature is enabled: –

The CSFB policy for UEs in idle mode is specified by the CSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter.

–

The CSFB policy for UEs in connected mode is specified by the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter.

If this feature is disabled, the CSFB policy is specified by the CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter, regardless of whether UEs are in idle or connected mode. If a target cell experiences admission failure during a handover from E-UTRAN to GERAN, the target cell enters the penalty and retry procedure. The penalty and retry procedure from E-UTRAN to GERAN is the same as that from E-UTRAN to UTRAN. For details, see 3.6.4 Retry and Penalty.

4.7 RIM Procedure Between E-UTRAN and GERAN The principles of the RIM procedure between E-UTRAN and GERAN are the same as those described in 3.7 RIM Procedure Between E-UTRAN and UTRAN. The RIM procedure between E-UTRAN and GERAN is enabled by default because there is no switch for selecting a load information transfer channel. If ENodeBAlgoSwitch.RimOnEcoSwitch is set to OFF(Off), the RIM procedure is performed through the core network. If this parameter is set to ON(On), the RIM procedure is performed through the eCoordinator. The two RIM procedures select information exchange modes in the same way. In Figure 4-3: Issue 02 (2016-04-20)

eRAN TDD CS Fallback Feature Parameter Description

4 CSFB to GERAN

The RIM procedure between E-UTRAN and GERAN is controlled by the GERAN_RIM_SWITCH option of the ENodeBAlgoSwitch.RimSwitch parameter. –

If this option is selected, the eNodeB uses the RIM procedure in Multiple Report mode to obtain the SI of external GERAN cells. If external GERAN cells do not support the Multiple Report mode, they do not notify the eNodeB of any system information change after the initial request.

–

If this option is cleared, the eNodeB uses the RIM procedure in Single Report mode to obtain the system information of external GERAN cells.

Figure 4-3 Information exchange mode selection for the RIM procedure

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eRAN TDD CS Fallback Feature Parameter Description

5 Handover and CSFB Procedure Conflict Optimization

Handover and CSFB Procedure Conflict Optimization When the UE in connected mode initiates the CSFB procedure during S1/X2-based handover preparation, the CSFB procedure conflicts with the handover procedure. The eNodeB preferentially processes the handover procedure and responds to the MME with a CSFB call request failure message. After the handover is complete, the MME re-sends a CSFB request message to the eNodeB to re-initiate the CSFB procedure, as stipulated by 3GPP TS 23.401. If the MME cannot re-send the CSFB reestablishment request in such a scenario, the CSFB call fails. When a UE attaching to the network or in idle mode initiates a TAU procedure, a default bearer is established. The eNodeB considers the UE in connected mode and allows the handover procedure before completing the Attach or TAU procedure. However, the MME allows the handover procedure only after the attach or TAU procedure is completed. Therefore, the MME identifies the handover request from the eNodeB as inappropriate and discards it. The eNodeB waits for the handover request response for 20s (default value specified by the timer). If the eNodeB receives the UE CONTEXT MODIFICATION REQUEST message with the CS Fallback Indicator IE from the MME, the eNodeB rejects the CSFB request and therefore the CSFB call fails. To solve CSFB call failure problems in the preceding scenarios, the eNodeB needs to preferentially process the CSFB procedure upon the conflict. Select the CsfbFlowFirstSwitch option of the GlobalProcSwitch.HoProcCtrlSwitch parameter so that the eNodeB preferentially processes the CSFB procedure during handover preparation. If the eNodeB receives the UE CONTEXT MODIFICATION REQUEST message with the CS Fallback Indicator IE before handover indication is transmitted over the air interface, the eNodeB sends the HANDOVER CANCEL message to the MME to cancel the handover procedure and prioritize the CSFB procedure. NOTE

When the CSFB procedure conflicts with the inter-eNodeB reestablishment with no context, the eNodeB preferentially processes the reestablishment procedure.

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eRAN TDD CS Fallback Feature Parameter Description

6 Related Features

Related Features

6.1 Features Related to TDLOFD-001033 CS FallBack to UTRAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001019

PS Inter-RAT Mobility between E-UTRAN and UTRAN

None

Feature ID

Feature Name

Description

TDLOFD-001035

CS Fallback to CDMA2000 1xRTT

When a UE initiates a CSFB request, the eNodeB cannot determine whether the target inter-RAT network is a CDMA2000 1xRTT network or a GERAN/UTRAN, according to 3GPP Release 9. Therefore, it is not recommended that CSFB to GERAN/ UTRAN be enabled together with CSFB to CDMA2000 1xRTT. That is, it is not recommended that this feature be enabled together with the preceding two features.

Mutually Exclusive Features None

Impacted Features

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eRAN TDD CS Fallback Feature Parameter Description

6 Related Features

Feature ID

Feature Name

Description

TDLOFD-001090

Enhanced CS Fallback to CDMA2000 1xRTT

If both CSFB to UTRAN and CSFB to CDMA2000 are enabled, the eNodeB attempts to perform CSFB to UTRAN first. If the attempt fails, the eNodeB tries CSFB to CDMA2000.

6.2 Features Related to TDLOFD-001052 Flash CS Fallback to UTRAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001033

CS Fallback to UTRAN

None

Mutually Exclusive Features None

Impacted Features None

6.3 Features Related to TDLOFD-081223 Ultra-Flash CSFB to UTRAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001033

CS Fallback to UTRAN

None

Mutually Exclusive Features None

Impacted Features None

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eRAN TDD CS Fallback Feature Parameter Description

6 Related Features

6.4 Features Related to TDLOFD-001068 CS Fallback with LAI to UTRAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001033

CS Fallback to UTRAN

None

Mutually Exclusive Features None

Impacted Features None

6.5 Features Related to TDLOFD-001088 CS Fallback Steering to UTRAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001033

CS Fallback to UTRAN

None

Feature ID

Feature Name

Description

TDLOFD-001089

CS Fallback Steering to GERAN

In overlapping coverage of GSM, UMTS, and LTE networks, these two features, if enabled simultaneously, achieve CSFB steering to different RATs.

Mutually Exclusive Features None

Impacted Features

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eRAN TDD CS Fallback Feature Parameter Description

6 Related Features

6.6 Features Related to TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001033

CS Fallback to UTRAN

TDLOFD-001019

PS Inter-RAT Mobility between E-UTRAN and UTRAN

This feature depends on either preceding feature.

Mutually Exclusive Features None

Impacted Features None

6.7 Features Related to TDLOFD-001034 CS Fallback to GERAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001020

PS Inter-RAT Mobility between E-UTRAN and GERAN

None

Feature ID

Feature Name

Description

TDLOFD-001035

CS Fallback to CDMA2000 1xRTT

When a UE initiates a CSFB request, the eNodeB cannot determine whether the target inter-RAT network is a CDMA2000 1xRTT network or a

Mutually Exclusive Features None

Impacted Features

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eRAN TDD CS Fallback Feature Parameter Description

6 Related Features

Feature ID

Feature Name

Description

TDLOFD-001090

Enhanced CS Fallback to CDMA2000 1xRTT

GERAN/UTRAN, according to 3GPP Release 9. Therefore, it is not recommended that CSFB to GERAN/ UTRAN be enabled together with CSFB to CDMA2000 1xRTT. That is, it is not recommended that this feature be enabled together with either of the preceding features. If both CSFB to GERAN and CSFB to CDMA2000 are enabled, the eNodeB attempts to perform CSFB to GERAN first. If the attempt fails, the eNodeB tries CSFB to CDMA2000.

6.8 Features Related to TDLOFD-001053 Flash CSFB to GERAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001034

CS Fallback to GERAN

None

Mutually Exclusive Features None

Impacted Features None

6.9 Features Related to TDLOFD-081203 Ultra-Flash CSFB to GERAN Prerequisite Features

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Feature ID

Feature Name

Description

TDLOFD-001034

CS Fallback to GERAN

None

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eRAN TDD CS Fallback Feature Parameter Description

6 Related Features

Mutually Exclusive Features None

Impacted Features None

6.10 Features Related to TDLOFD-001069 CS Fallback with LAI to GERAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001034

CS Fallback to GERAN

None

Mutually Exclusive Features None

Impacted Features None

6.11 Features Related to TDLOFD-001089 CS Fallback Steering to GERAN Prerequisite Features Feature ID

Feature Name

Description

TDLOFD-001034

CS Fallback to GERAN

None

Mutually Exclusive Features None

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eRAN TDD CS Fallback Feature Parameter Description

6 Related Features

Impacted Features

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Feature ID

Feature Name

Description

TDLOFD-001088

CS Fallback Steering to UTRAN

In overlapping coverage of GSM, UMTS, and LTE networks, these two features, if enabled simultaneously, achieve CSFB steering to different RATs.

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eRAN TDD CS Fallback Feature Parameter Description

7 Network Impact

Network Impact

7.1 TDLOFD-001033 CS FallBack to UTRAN System Capacity In essence, CSFB provides CS service access for E-UTRAN UEs. Considering that the number of UEs that request CS services within an area is relatively stable and is not affected by EPS deployment, CSFB has no impact on the total number of UEs that request CS services within a network. Load-based CSFB to UTRAN prevents PS handover preparation failure caused by UTRAN cell congestion, because the eNodeB selects a target cell based on the UTRAN cell load status. This increases system capacity. CSFB mechanisms affect signaling overhead as follows: l

If redirection is used as the CSFB mechanism, no extra signaling message is required for the UTRAN because each CSFB procedure is equivalent to the initiation of a new CS service. The EPS does not need to interact with the target network. Therefore, signaling overhead is negligible.

If PS handover is used as the CSFB mechanism, extra signaling messages are required from each NE for the request, preparation, and execution of each handover. However, from the perspective of traffic statistics, the number of UEs that initiate CS services per second per cell during peak hours is far below cell capacity. Therefore, signaling overhead caused by PS handovers is low.

Network Performance Load-based CSFB to UTRAN prevents PS handover preparation failure caused by UTRAN cell congestion, because the eNodeB selects a target cell based on the UTRAN cell load status. This increases the CSFB delay. CSFB affects the access success rate as follows: l

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CSFB affects the access success rate as follows: If redirection is used as the CSFB mechanism, each CSFB procedure is equivalent to the initiation of a new CS service. Therefore, the access success rate for CSFB UEs is theoretically the same as that for normal CS UEs in the UTRAN. Huawei Proprietary and Confidential Copyright ÂŠ Huawei Technologies Co., Ltd.

eRAN TDD CS Fallback Feature Parameter Description

7 Network Impact

If PS handover is used as the CSFB mechanism, the access success rate for CSFB UEs depends on the success rate of handovers to the target RAT. Handover-triggered CS service access has a higher requirement for signal quality compared with normal CS service access. Therefore, the access success rate for CSFB UEs is a little lower than that for normal CS UEs in the UTRAN.

7.2 TDLOFD-001052 Flash CS Fallback to UTRAN System Capacity In essence, CSFB provides CS service access for E-UTRAN UEs. Considering that the number of UEs that request CS services within an area is relatively stable and is not affected by EPS deployment, CSFB has no impact on the total number of UEs that request CS services within a network. CSFB mechanisms affect signaling overhead as follows: l

Extra signaling messages are required only during eNodeB deployment. Afterward, signaling overhead is negligible because of infrequent system information updates.

Network Performance Flash CSFB to UTRAN decreases the CSFB delay by up to 1.28s because UEs obtain information about the target UTRAN cell for redirection before RRC connections to the LTE network are released. Flash CSFB affects the access success rate as follows: l

Each flash CSFB procedure is equivalent to the initiation of a new CS service. Therefore, the access success rate for CSFB UEs is theoretically the same as that for normal CS UEs in the UTRAN.

The RRC connection setup success rate may decrease slightly for the UTRAN. The uplink interference information contained in SIB7 in the UTRAN updates frequently. The RNC cannot update the uplink interference information in the system information sent to the LTE network based on SIB7 in the UTRAN. Therefore, the uplink interference information contained in SIB7 in the LTE network is a default value (–105 dBm). If the actual uplink interference in the UTRAN is greater than –105 dBm, the transmit power on UEs' physical random access channel (PRACH) increases and the RRC connection setup success rate may decrease.

7.3 TDLOFD-081223 Ultra-Flash CSFB to UTRAN System Capacity No impact.

Network Performance Compared with standard CSFB, this feature reduces the delay of CSFB to UTRAN by 1 second, improving user experience. Issue 02 (2016-04-20)

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7.4 TDLOFD-001068 CS Fallback with LAI to UTRAN System Capacity No impact.

Network Performance CSFB with LAI ensures that a UE can fall back to the CS network to which the UE has attached. This prevents CSFB failure or long delay caused by incorrect target RAT selection and increases the CSFB success rate.

7.5 TDLOFD-001088 CS Fallback Steering to UTRAN System Capacity No impact.

Network Performance Using this feature, an operator that owns inter-RAT networks can specify the target RAT and frequency for CSFB based on the network plan and network load balancing requirements and thereby improve network operating efficiency. If the frequency with the highest priority is inappropriately configured, for example, if the highest-priority frequency has coverage holes, a UE may fail to measure this frequency and therefore the CSFB delay increases. This feature may conflict with the service-based directed retry decision (DRD) algorithm used for UTRAN, thereby affecting user experience. For example, if a CS service is initiated for a UE that is performing PS services, the eNodeB may select a High Speed Packet Access (HSPA) frequency used in UTRAN for CSFB based on configured policies. However, if the UE requests CS bearer establishment first after the fallback, the UTRAN may transfer the UE to an R99 frequency.

7.6 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering System Capacity No impact.

Network Performance E-UTRAN to UTRAN CS/PS Steering enables an eNodeB to include only UTRAN frequencies with the highest CS service priority in measurement configurations. This prevents redundant measurements, reduces the measurement time, and decreases end-to-end CSFB delay. Consistent settings of the CS service priorities for UTRAN frequencies between the EUTRAN and the UTRAN help prevent further handovers for service steering after CSFB. Issue 02 (2016-04-20)

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7.7 TDLOFD-001034 CS Fallback to GERAN System Capacity In essence, CSFB provides CS service access for E-UTRAN UEs. Considering that the number of UEs that request CS services within an area is relatively stable and is not affected by EPS deployment, CSFB has no impact on the total number of UEs that request CS services within a network. CSFB mechanisms affect signaling overhead as follows: l

If redirection or CCO without NACC is used as the CSFB mechanism, no extra signaling message is required for the GERAN because each CSFB procedure is equivalent to the initiation of a new CS service. The EPS does not need to interact with the target network. Therefore, signaling overhead is negligible.

If CCO with NACC is used as the CSFB mechanism, extra signaling messages are required only during eNodeB deployment.

Network Performance CSFB affects the access success rate as follows: l

If redirection or CCO/NACC is used as the CSFB mechanism, each CSFB procedure is equivalent to the initiation of a new CS service. Therefore, the access success rate for CSFB UEs is theoretically the same as that for normal CS UEs in the GERAN.

7.8 TDLOFD-001053 Flash CSFB to GERAN System Capacity In essence, CSFB provides CS service access for E-UTRAN UEs. Considering that the number of UEs that request CS services within an area is relatively stable and is not affected by EPS deployment, CSFB has no impact on the total number of UEs that request CS services within a network. CSFB mechanisms affect signaling overhead as follows: Extra signaling messages are required only during eNodeB deployment. Afterward, signaling overhead is negligible because of infrequent system information updates. Issue 02 (2016-04-20)

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Network Performance If flash CSFB is used as the CSFB mechanism, each CSFB procedure is equivalent to the initiation of a new CS service. Therefore, the access success rate for CSFB UEs is theoretically the same as that for normal CS UEs in the GERAN. Flash CSFB to GERAN decreases the CSFB delay by up to 2s because UEs obtain information about the target GERAN cell for redirection before RRC connections to the LTE network are released.

7.9 TDLOFD-081203 Ultra-Flash CSFB to GERAN System Capacity When DRX is used for measurements, there is a higher probability that the UE enters sleep time. This affects the scheduling and therefore decreases cell throughput.

Network Performance Compared with standard CSFB, this feature reduces the delay of CSFB to GERAN by 2s, improving user experience.

7.10 TDLOFD-001069 CS Fallback with LAI to GERAN System Capacity No impact.

7.11 TDLOFD-001089 CS Fallback Steering to GERAN System Capacity No impact.

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Engineering Guidelines

8.1 TDLOFD-001033 CS Fallback to UTRAN This section provides engineering guidelines for TDLOFD-001033 CS Fallback to UTRAN.

8.1.1 When to Use CS Fallback to UTRAN Use this feature in the initial phase of LTE network deployment when the following conditions are met: l

The operator owns a mature UTRAN network.

The LTE network does not provide VoLTE services, or UEs in the LTE network do not support VoLTE services.

For policies on whether to use PS handover or PS redirection for CSFB, see Inter-RAT Mobility Management in Connected Mode. If UTRAN and E-UTRAN cells cover the same area, or the UTRAN cell provides better coverage than the E-UTRAN cell, use CSFB based on blind handover to decrease the CSFB delay.

8.1.2 Required Information 1.

Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN and UTRAN cells. Information about coverage areas includes engineering parameters of sites (such as latitude and longitude), TX power of cell reference signals, and neighbor relationship configurations.

Collect the versions and configurations of the NEs in the E-UTRAN, UTRAN, and core networks, and ensure that they all support CSFB. Table 8-1 describes the requirements of CSFB to UTRAN for the core networks.

Collect the following information about the UEs that support UMTS and LTE on the live network:

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–

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to UTRAN

–

Whether the UEs support PS handover from E-UTRAN to UTRAN

–

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This information is used to configure neighboring UTRAN cells and to determine whether to perform CSFB based on handover or redirection. For details, see Inter-RAT Mobility Management in Connected Mode. 4.

Collect information about the RNC, MME, and SGSN to check whether they all support RIM procedures.

Table 8-1 Requirements of CSFB to UTRAN for core networks NE

Requirement

MME

l Supports: SGs interface to the MSC l LAI selection based on the TAI of the serving cell l MSC-initiated paging l PLMN selection and reselection l Combined EPS/IMSI attach, combined EPS/ IMSI detach, and combined TAU/LAU l CS signaling message routing l SMS over SGs

MSC

l Supports: Combined EPS/IMSI attach l SMS over SGs l Paging message forwarding over the SGs interface

SGSN

Does not activate idle mode signaling reduction (ISR) during the combined RAU/LAU procedure initiated by the UE.

8.1.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-2.

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Table 8-2 License control item for CSFB to UTRAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD-001 033

CS Fallback to UTRAN

LT1ST0C FBU00

CS Fallback to UTRAN(TD D)

eNodeB

per RRC Connected User

8.1.4 Precautions None

8.1.5 Data Preparation and Feature Activation 8.1.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data Before configuring CSFB to UTRAN, collect the data related to neighbor relationships with UTRAN cells. This section provides only the information about managed objects (MOs) related to neighboring UTRAN cells. For more information about how to collect data for the parameters in these MOs, see Inter-RAT Mobility Management in Connected Mode Feature Parameter Description. Collect data for the parameters in the following MOs: 1.

UtranNFreq: used to configure neighboring UTRAN frequencies.

UtranExternalCell: used to configure external UTRAN cells. The UtranExternalCell.Rac parameter must be set.

UtranExternalCellPlmn: used to configure additional PLMN IDs for each shared external UTRAN cell. This MO is required only if the NodeB that serves the external UTRAN cell works in RAN sharing with common carriers mode and multiple operators share the external UTRAN cell.

UtranNCell: used to configure the neighboring relationship with a UTRAN cell. If a neighboring UTRAN cell supports blind handovers according to the network plan, the blind-handover priority of the cell must be specified by the UtranNCell.BlindHoPriority parameter.

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Scenario-specific Data The following table describes the parameters that must be set in the CellHoParaCfg and CellAlgoSwitch MOs to set the cell-level handover mode and handover allowed switches for CS Fallback to UTRAN. Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handover Mode switch

CellHoP araCfg. HoMode Switch

Network plan (negotiation not required)

Set this parameter based on the network plan.

Handover Allowed Switch

CellAlg oSwitch .HoAllo wedSwit ch

Network plan (negotiation not required)

To activate CSFB to UTRAN, select the UtranCsfbSwitch(UtranCsfbSwitch) option.

To activate PS handovers, select the UtranPsHoSwitch(UtranPsHoSwitch) option. If this option is not selected, redirection will be used for CSFB to UTRAN.

The following table describes the parameters that must be set in the ENodeBAlgoSwitch and CellHoParaCfg MOs to set eNodeB- and cell-level blind handover switches. Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handover Mode switch

ENodeB AlgoSwi tch.Ho ModeSw itch

Network plan (negotiation not required)

To activate blind handovers, select the BlindHoSwitch(BlindHoSwitch) option of the parameter. If the BlindHoSwitch(BlindHoSwitch) option is cleared, blind handovers for all cells under the eNodeB are invalid.

Handover Mode switch

CellHo ParaCf g.HoMo deSwitc h

Network plan (negotiation not required)

To activate blind handovers for a cell under the eNodeB, select the BlindHoSwitch(BlindHoSwitch) option of the parameter. If the BlindHoSwitch(BlindHoSwitch) option is cleared, blind handovers for the cell are invalid.

The following table describes the parameters that must be set in the CellAlgoSwitch and CSFallBackHo MOs to set the switch for cell-level adaptive blind handover for CSFB and the A1 threshold for adaptive blind handover for CSFB.

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Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handove r Allowed Switch

CellAlg oSwitch .HoAllo wedSwit ch

Network plan (negotiation not required)

When UMTS and LTE cells are co-sited with the same coverage, you can enable CsfbAdaptiveBlindHoSwitch. The eNodeB selects a measurement or blind handover to UMTS based on the event A1 report submitted by a UE.

CSFB Adaptive Blind Ho A1 RSRP Trigger Threshol d

CSFall BackHo .BlindH oA1Thd Rsrp

Network plan (negotiation not required)

This parameter specifies the RSRP threshold of the serving cell above which a CSFB-triggered adaptive blind handover is triggered. If the RSRP value measured by a UE exceeds this threshold, the UE submits a event A1 report. If the eNodeB receives an event A1 report, it directly enters the blind handling procedure. If the eNodeB does not receive an event A1 report (the UE is located at the edge of the E-UTRAN cell), it enters the measurement procedure. The target measurement RAT depends on configured RAT priorities and UE capabilities. On the live network, set this parameter based on network coverage.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB.

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Param eter Name

Parameter ID

Data Source

Setting Notes

CN Operat or ID

CSFallBack BlindHoCfg. CnOperatorI d

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter identifies the operator whose RAT blindhandover priorities are to be set.

Highes t priority InterRa t

CSFallBack BlindHoCfg. InterRatHig hestPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to UTRAN by default and specifies the highest-priority RAT to be considered in blind handovers for CSFB. For CSFB to UTRAN, retain the default value.

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Param eter Name

Parameter ID

Data Source

Setting Notes

Second priority InterRa t

CSFallBack BlindHoCfg. InterRatSeco ndPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to GERAN by default and specifies the second-highest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CSFallBackBlindHoCfg.InterRatHighestPri and CSFallBackBlindHoCfg.InterRatLowestPri parameters.

Lowest priority InterRa t

CSFallBack BlindHoCfg. InterRatLow estPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to CDMA2000 by default and specifies the lowest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CSFallBackBlindHoCfg.InterRatHighestPri and CSFallBackBlindHoCfg.InterRatSecondPri parameters.

UTRA N LCS capabil ity

CSFallBack BlindHoCfg. UtranLcsCa p

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter specifies the LCS capability of the UTRAN.

The following table describes the parameters that must be set in the CellOpHoCfg MO to set cell-level handover priorities of different RATs for CSFB.

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Paramet er Name

Parameter ID

Data Source

Setting Notes

CN Operator ID

CellOpHoCfg. CnOperatorId

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter identifies the operator whose RAT blind-handover priorities are to be set.

Local cell ID

CellOpHoCfg. LocalCellId

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter identifies the cell whose RAT blind-handover priorities are to be set.

Highest priority InterRat

CellOpHoCfg.I nterRatHighest Pri

Network plan (negotiation not required)

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Paramet er Name

Parameter ID

Data Source

Setting Notes

Second priority InterRat

CellOpHoCfg.I nterRatSecondP ri

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter is set to GERAN by default and specifies the second-highestpriority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CSFallBackBlindHoCfg.InterRatHighestPri and CSFallBackBlindHoCfg.InterRatLowestPri parameters.

Lowest priority InterRat

CellOpHoCfg.I nterRatLowestP ri

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter is set to CDMA2000 by default and specifies the lowest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CellOpHoCfg.InterRatHighestPri and CellOpHoCfg.InterRatSecondPri parameters.

The following table describes the parameter that must be set in the ENodeBAlgoSwitch MO to activate load-based CSFB. Paramete r Name

Parameter ID

Data Source

Setting Notes

Handover Algo switch

ENodeBAlg oSwitch.Ho AlgoSwitch

Network plan (negotiation not required)

To activate load-based CSFB, select the CSFBLoadInfoSwitch(CSFBLoadInfo Switch) option.

The following table describes the parameter that must be set in the GlobalProcSwitch MO to set load-based CSFB to UTRAN. Parameter Name

Parameter ID

Data Source

Setting Notes

Choose UTRAN Cell Load Info Trans Channel

GlobalProcS witch.Utran LoadTransC han

Network plan (negotiatio n not required)

Set this parameter to BASED_ON_RIM to enable UTRAN cell load information acquisition through RIM if the RNC, MME, and SGSN support RIM.

The following table describes the parameter that must be set in the CSFallBackHo MO to set the CSFB protection timer. Issue 02 (2016-04-20)

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Paramete r Name

Parameter ID

Data Source

Setting Notes

CSFB Protection Timer

CSFallBack Ho.CsfbPro tectionTime r

Network plan (negotiation not required)

Set this parameter based on the network plan. The default value 4 applies to a GSM+UMTS+LTE network. The value 2 is recommended for a UMTS+LTE network. If this parameter is set too large, the CSFB delay increases in abnormal CSFB scenarios. If this parameter is set too small, normal measurement or handover procedures may be interrupted.

The following table describes the parameter that must be set in the CSFallBackPolicyCfg MO to specify the CSFB policy. Para meter Name

Parameter ID

Data Source

Setting Notes

CSFB hando ver policy Config uratio n

CSFallBack PolicyCfg.Cs fbHoPolicyC fg

Network plan (negotiation not required)

Set this parameter based on the network plan. The default values are REDIRECTION, CCO_HO, and PS_HO. You are advised to set this parameter based on the UE capabilities and network capabilities. NOTE If none of the three options is selected and measurement-based mobility is enabled, the eNodeB does not perform CSFB for a UE until the CSFB protection timer expires. Then the eNodeB performs a blind redirection for the UE. If blind handover is enabled, the eNodeB directly performs a blind redirection for the UE. CCO_HO applies only to CSFB to GERAN.

The following table describes the parameter that must be set in the GlobalProcSwitch MO to control redirection-based CSFB optimization for UEs in idle mode.

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Para meter Name

Parameter ID

Data Source

Setting Notes

Protoc ol Messa ge Optim ization Switch

GlobalProcSwi tch.ProtocolMs gOptSwitch

Network plan (negotiatio n not required)

To shorten the CSFB delay by skipping an RRC connection reconfiguration procedure during blind redirection for CSFB, select the IdleCsfbRedirectOptSwitch option of this parameter.

The following table describes the parameter that must be set in the CSFallBackBlindHoCfg MO to set the round-robin switch when multiple frequencies are of the same priority for CSFB-based blind redirections. Para meter Name

Parameter ID

Data Source

Setting Notes

CSFB to UTRA N Blind Redire ction RR Switch

CSFallBack BlindHoCfg. UtranCsfbBl indRedirRrS w

Network plan (negotiation not required)

The function corresponding to this parameter does not take effect when CSFB steering or CS/PS steering is enabled. This parameter will be cancelled in later versions. The default value OFF is recommended.

The following table describes the parameter that must be set in the GlobalProcSwitch MO to set the CSFB frequency selection optimization switch.

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Para meter Name

Parameter ID

Data Source

Setting Notes

CSFB Flow Optim ization Switch

GlobalProcS witch.CsfbFl owOptSwitch

Network plan (negotiation not required)

Set UTRAN_CSFB_FREQ_CHOOSE_OPT_SW based on the network plan. The option is cleared by default. If there are multiple target frequencies or cells of the same priority, the UE selects the target frequency or cell randomly and evenly. The target frequency selection is affected by the number of cell priorities of the target frequency.

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The following table describes the parameters that must be set in the CellHoParaCfg MO to configure the measurement report processing and waiting functions. Paramete r Name

Parameter ID

Data Source

Setting Notes

LTE To UTRAN CSFB Measurem ent Processin g Mode

CellHoParaCfg.L2U CsfbMRProMode

Network plan (negotiation not required)

If this parameter is set to BASED_ON_SIGNAL_STREN GTH or BASED_ON_FREQ_PRIORIT Y, the eNodeB does not immediately trigger handover after receiving a measurement report. Instead, it waits for other measurement reports so that it can select a desired cell from the measurement reports for CSFB.

CSFB Measurem ent Waiting Timer

CellHoParaCfg.Csfb MRWaitingTimer

Network plan (negotiation not required)

The default value 100ms is recommended. This avoids long time in waiting for the next measurement report and the impact on CSFB delay.

The following table describes the parameter that must be set in the GlobalProcSwitch MO to set the policy for handling the conflicts between handover and CSFB procedures. Paramete r Name

Parameter ID

Data Source

Setting Notes

Handover Process Control Switch

GlobalProcSwitch.H oProcCtrlSwitch

Network plan (negotiation not required)

It is recommended that this parameter be set when handover and CSFB procedures conflict, increasing the number of CSFB preparation failures. The number of CSFB preparation failures because of procedure conflicts is obtained from L.CSFB.PrepFail.Conflict.

8.1.5.2 Using the CME l

Fast Batch Activation This feature can be batch activated using the Feature Operation and Maintenance function of the CME. For detailed operations, see the following section in the CME product documentation or online help: CME Management > CME Guidelines > Enhanced Feature Management > Feature Operation and Maintenance.

Single/Batch Configuration This feature can be activated for a single eNodeB or a batch of eNodeBs on the CME. For detailed operations, see CME-based Feature Configuration.

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8.1.5.3 Using MML Commands Using MML Commands Basic scenario 1: CSFB to UTRAN using blind redirection CSFB to UTRAN using blind redirection works regardless of whether neighboring UTRAN cells are configured. l

If you want to configure a neighboring UTRAN cell, you must configure the UtranNFreq and UtranNCell MOs. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode.

If you do not want to configure a neighboring UTRAN cell, you must configure the UtranRanShare or UtranExternalCell MO. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode.

Step 1 Run the MOD CELLALGOSWITCH command with the UtranCsfbSwitch(UtranCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

This function is also controlled by the UtranCsfbSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that the eNodeB-level parameter be turned off and the cell-level parameter be used.

Step 2 Run the following eNodeB- and cell-level commands to enable blind handovers for CSFB to UTRAN: 1.

Run the MOD ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch) option of the Handover Mode switch parameter selected.

Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter selected.

Step 3 Run the MOD CSFALLBACKPOLICYCFG command with the CCO_HO and PS_HO options of the CSFB handover policy Configuration parameter cleared and the REDIRECTION option of the same parameter selected. Step 4 (Optional) If you require UTRAN to have the highest priority for CSFB, run the following eNodeB- and cell-level commands: 1.

Run the MOD CSFALLBACKBLINDHOCFG command with the Highest priority InterRat and Second priority InterRat parameters set to UTRAN and GERAN, respectively.

Run the ADD CELLOPHOCFG command with the Highest priority InterRat and Second priority InterRat parameters set to UTRAN and GERAN, respectively.

Step 5 (Optional) If a neighboring UTRAN cell is configured, run the MOD UTRANNCELL command with the Blind handover priority parameter set to the highest priority (32). Step 6 (Optional) If no neighboring UTRAN cell is configured, run the MOD UTRANNFREQ command with the Frequency Priority for Connected Mode parameter set to the highest priority (8). Issue 02 (2016-04-20)

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Step 7 (Optional) Run the MOD GLOBALPROCSWITCH command with the IdleCsfbRedirectOptSwitch option of the Protocol Message Optimization Switch parameter selected. ----End Basic scenario 2: CSFB to UTRAN using blind handovers Step 1 Run MML commands to configure neighboring UTRAN frequencies and UTRAN cells. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode. Step 2 Run the MOD CELLALGOSWITCH command with the UtranCsfbSwitch(UtranCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

Step 3 Run the following eNodeB- and cell-level commands to enable blind handovers for CSFB to UTRAN: 1.

Run the MOD ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch) option of the Handover Mode switch parameter selected.

Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter selected.

Step 4 Run the MOD CELLHOPARACFG command with the UtranPsHoSwitch(UtranPsHoSwitch) option of the Handover Mode switch parameter selected. NOTE

This function is also controlled by the UtranPsHoSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoModeSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that the eNodeB-level parameter be turned off and the cell-level parameter be used.

Step 5 Run the MOD UTRANNCELL command with the Blind handover priority parameter set to 32. ----End Basic scenario 3: CSFB to UTRAN using measurement-based redirection Step 1 Run MML commands to configure neighboring UTRAN frequencies and UTRAN cells. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode. Step 2 Run the MOD CELLALGOSWITCH command with the UtranCsfbSwitch(UtranCsfbSwitch) option of the Handover Allowed Switch parameter selected. Issue 02 (2016-04-20)

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NOTE

Step 3 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter deselected for the cells to be measured. Step 4 Run the MOD CSFALLBACKPOLICYCFG command with the CCO_HO and PS_HO options of the CSFB handover policy Configuration parameter cleared and the REDIRECTION option of the same parameter selected. ----End Basic scenario 4: CSFB to UTRAN using measurement-based handovers Step 1 Run MML commands to configure neighboring UTRAN frequencies and UTRAN cells. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode. Step 2 Run the MOD CELLALGOSWITCH command with the UtranCsfbSwitch(UtranCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

This function is also controlled by the UtranPsHoSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoModeSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that the eNodeB-level parameter be turned off and the cell-level parameter be used.

----End Enhanced scenario 1: Load-based CSFB to UTRAN To activate load-based CSFB to UTRAN, run the following commands after the commands in a basic scenario are executed: Issue 02 (2016-04-20)

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Step 1 Run the MOD ENODEBALGOSWITCH command with the CSFBLoadInfoSwitch(CSFBLoadInfoSwitch) option of the Handover Algo switch parameter selected. Step 2 Run the MOD GLOBALPROCSWITCH command with the Choose UTRAN Cell Load Info Trans Channel parameter set to BASED_ON_RIM. ----End Enhanced scenario 2: Measurement report processing and waiting To enable the eNodeB to immediately perform handover evaluation after receiving a measurement report for CSFB to UTRAN, run the following command after the commands in a basic scenario are executed: Step 1 Run the MOD CELLHOPARACFG command with the HANDOVER_IMMEDIATELY option of the LTE To UTRAN CSFB Measurement Processing Mode parameter selected. ----End Enhanced scenario 3: Policy setting for handling the conflicts between handover and CSFB procedures To enable the eNodeB to process the CSFB procedure first, run the following command after the commands in a basic scenario are executed: Step 1 Run the MOD GLOBALPROCSWITCH command with the CsfbFlowFirstSwitch option of the Handover Process Control Switch parameter selected. ----End

MML Command Examples Basic scenario 1: CSFB to UTRAN using blind redirection (configured with neighboring UTRAN cells) MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1; MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1; MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0; MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN, InterRatSecondPri=GERAN; ADD CELLOPHOCFG: LocalCellId=0, CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN; MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123, BlindHoPriority=32; MOD GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1;

Basic scenario 1: CSFB to UTRAN using blind redirection (configured with no neighboring UTRAN cell) MOD MOD MOD MOD MOD MOD MOD MOD MOD

CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1; ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1; CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1; CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0; CELLOPHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN; UTRANNFEQ: LocalCellId=0, UtranDlArfcn=9700, ConnFreqPriority=8; UTRANRANSHARE: LocalCellId=0, UtranDlArfcn=9700, Mcc="460", Mnc="20"; GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1; CSFALLBACKBLINDHOCFG: CnOperatorId=0, UtranCsfbBlindRedirRrSw=ON;

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MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch= UtranCsfbSwitch-1; MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=UtranPsHoSwitch-1&BlindHoSwitch-1; MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1; MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN, InterRatSecondPri=GERAN; MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123, BlindHoPriority=32;

Basic scenario 3: CSFB to UTRAN using measurement-based redirection MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0; MOD CSFALLBACKHO: LocalCellId=1, CsfbHoUtranTimeToTrig=40ms, CsfbHoUtranB1ThdRscp=-106, CsfbHoUtranB1ThdEcn0=-13, CsfbProtectionTimer=4; MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0; MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123;

Basic scenario 4: CSFB to UTRAN using measurement-based handovers MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1; MOD CSFALLBACKHO: LocalCellId=1, CsfbHoUtranTimeToTrig=40ms, CsfbHoUtranB1ThdRscp=-106, CsfbHoUtranB1ThdEcn0=-13, CsfbProtectionTimer=4; MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0&UtranPsHoSwitch-1; MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123;

Enhanced scenario 1: Load-based CSFB to UTRAN To activate load-based CSFB to UTRAN, run the following commands after the commands in a basic scenario are executed: MOD ENODEBALGOSWITCH:HoAlgoSwitch=CSFBLoadInfoSwitch-1; MOD GLOBALPROCSWITCH:UtranLoadTransChan=BASED_ON_RIM;

Enhanced scenario 2: Measurement report processing and waiting To enable the eNodeB to immediately perform handover evaluation after receiving a measurement report for CSFB to UTRAN, run the following command after the commands in a basic scenario are executed: MOD CELLHOPARACFG:LocalCellId=0, L2UCsfbMRProMode= HANDOVER_IMMEDIATELY;

Enhanced scenario 3: Policy setting for handling the conflicts between handover and CSFB procedures To enable the eNodeB to process the CSFB procedure first, run the following command after the commands in a basic scenario are executed: MOD GLOBALPROCSWITCH:HoProcCtrlSwitch= CsfbFlowFirstSwitch-1;

8.1.6 Activation Observation Signaling Observation The activation observation procedure for CSFB to UTRAN is as follows: 1.

Enable a UE to camp on an E-UTRAN cell and originate a voice call so that the UE falls back to a UTRAN cell and completes the call.

Enable a UE to camp on an E-UTRAN cell and receive a voice call so that the UE falls back to a UTRAN cell and completes the call.

The activation observation procedure for load-based CSFB to UTRAN is as follows: Issue 02 (2016-04-20)

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Two UTRAN cells A and B report MRs and are under overload control and in the normal state, respectively. The RSCP of cell A is larger than that of cell B. Enable a UE to perform a PS-handover-based CSFB when both cell A and cell B provide services correctly. 1.

If the RSCP of cell B meets the handover requirements, the eNodeB transfers the UE to cell B.

If cell B is blocked and the RSCP of cell A meets the handover requirements, the eNodeB transfers the UE to cell A and the UE can access the network through preemption or queuing.

Figure 8-1 and Figure 8-2 show sample procedures for CSFB to UTRAN for a mobileoriginated call and CSFB to UTRAN for a mobile-terminated call, respectively. In the examples, the UE was in idle mode before the call and is forced to fall back to the UTRAN using a redirection. NOTE

The same UE is shown in the left and right sides of the figure. This applies to all figures in the rest of this document. The messages on the UTRAN side are only for reference.

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Figure 8-1 Redirection-based CSFB to UTRAN for a mobile-originated call

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Figure 8-2 Redirection-based CSFB to UTRAN for a mobile-terminated call

If the UE capability is not included in the Initial Context Setup Request (Initial Context Setup Req in the figures) message, the eNodeB initiates a UE capability transfer procedure immediately after receiving this message from the MME. If the UE capability is included in the Initial Context Setup Request message, the eNodeB initiates a UE capability transfer procedure after sending an Initial Context Setup Response (Initial Context Setup Rsp in the figures) message to the MME. If measurement-based redirection is used for CSFB to UTRAN, the eNodeB delivers the B1related measurement configuration. If blind redirection is used for CSFB to UTRAN, the eNodeB does not deliver the B1-related measurement configuration but sends an RRC Connection Release (RRC Conn Rel in the figures) message to the UE. As shown in the red and green boxes in Figure 8-3, in the RRC Connection Release message, the cause value is "other" and the target RAT is UTRAN. For an emergency call, the cause value is "CSFBhighpriority." Issue 02 (2016-04-20)

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Figure 8-3 The RRC Connection Release message during CSFB to UTRAN

If PS handover is used for CSFB to UTRAN, the eNodeB initiates a PS handover procedure after receiving a measurement report from the UE, instead of sending an RRC Connection Release message to the UE. Figure 8-4 shows the PS handover procedure. As shown in the red and green boxes in Figure 8-5, in the handover command sent over the air interface, the cs-FallbackIndicator IE is TRUE and the target RAT is UTRAN. Figure 8-4 PS handover procedure

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Figure 8-5 The MobilityFromEUTRAN message during CSFB to UTRAN

MML Command Observation The activation observation procedure for load-based CSFB to UTRAN is as follows: Run the DSP UTRANRIMLOADINFO command to query neighboring UTRAN cell load status to check whether load-based CSFB has been activated. If the neighboring UTRAN cell load status is displayed, load-based CSFB has been activated.

Counter Observation Table 8-3 lists the performance counters for observing functions related to CSFB to UTRAN. Table 8-3 Performance counters for observing CSFB to UTRAN

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Function

Counter ID

Counter Name

Description

CSFB to UTRAN

152672832 3

L.CSFB.E2W

Number of times CSFB to UTRAN is performed

CSFB to UTRAN triggered for emergency calls

152672870 9

L.CSFB.E2W. Emergency

Number of times CSFB to UTRAN is triggered for emergency calls

RIM during load-based CSFB to UTRAN

152672894 9

L.RIM.Load. E2W.Req

Number of load information requests sent from an eNodeB to a UMTS network

152672895 0

L.RIM.Load. E2W.Resp

Number of load information responses sent from a UMTS network to an eNodeB

152672895 1

L.RIM.Load. E2W.Update

Number of load information updates sent from a UMTS network to an eNodeB

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8.1.7 Deactivation Table 8-4 describes the parameters for deactivating this feature. Table 8-4 Parameters for deactivating CSFB to UTRAN MO

Parameter Group

Setting Notes

ENodeBAlgoSwitch

HoAlgoSwitch

To deactivate load-based CSFB to UTRAN, set CSFBLoadInfoSwitch of the HoAlgoSwitch parameter to 0.

CellAlgoSwitch

HoAllowedSwitch

To deactivate CSFB to UTRAN, set UtranCsfbSwitch of the HoAlgoSwitch parameter to 0. To deactivate only adaptive-blindhandover-based CSFB, Set CsfbAdaptiveBlindHoSwitch to 0.

This feature can be deactivated using the CME or MML commands.

8.1.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.1.7.2 Using MML Commands Using MML Commands l

Deactivating CSFB to UTRAN Run the MOD CELLALGOSWITCH command with the UtranCsfbSwitch(UtranCsfbSwitch) option of the Handover Allowed Switch parameter cleared.

Deactivating only load-based CSFB to UTRAN Run the MOD ENODEBALGOSWITCH command with the CSFBLoadInfoSwitch(CSFBLoadInfoSwitch) option of the Handover Algo switch parameter cleared.

Deactivating adaptive-blind-handover-based CSFB Run the MOD CELLALGOSWITCH command with the CsfbAdaptiveBlindHoSwitch(CsfbAdaptiveBlindHoSwitch) option of the Handover Allowed Switch parameter cleared.

MML Command Examples l

Deactivating CSFB to UTRAN MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=UtranCsfbSwitch-0;

Deactivating only load-based CSFB to UTRAN MOD ENODEBALGOSWITCH: HoAlgoSwitch=CSFBLoadInfoSwitch-0;

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Deactivating adaptive-blind-handover-based CSFB MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch= CsfbAdaptiveBlindHoSwitch-0;

8.1.8 Performance Monitoring CSFB is an end-to-end service. The performance counters on the LTE side can only indicate the success rate of the CSFB procedure on the LTE side, and. they cannot indicate the success rate of the CSFB procedure on the target side. Therefore, the performance counters on the LTE side cannot directly show user experience of the CSFB procedure. It is recommended that you perform drive tests and use the performance counters on the UE side to indicate the actual user experience of the CSFB procedure. Table 8-5 lists counters related to the execution of CSFB by the eNodeB. Table 8-5 Counters related to the execution of CSFB by the eNodeB Counter ID

Counter Name

Description

1526728321

L.CSFB.PrepAtt

Number of CSFB indicators received by the eNodeB

1526728322

L.CSFB.PrepSucc

Number of successful CSFB responses from the eNodeB

Table 8-6 lists the counter related to CSFB to UTRAN. Table 8-6 Counter related to CSFB to UTRAN Counter ID

Counter Name

Description

1526728323

L.CSFB.E2W

Number of procedures for CSFB to WCDMA network

Table 8-7 lists the counters that indicate whether CSFB is performed through redirection or handover. Table 8-7 Counters related to CSFB through redirection or handover Counter ID

Counter Name

Description

1526728497

L.RRCRedirectio n.E2W.CSFB

Number of CSFB-based redirections from EUTRANs to WCDMA network

1526728504

L.IRATHO.E2W. CSFB.PrepAttOu t

Number of CSFB-based inter-RAT handover preparation attempts from E-UTRAN to WCDMA network

After the CSFB protection timer expires, the eNodeB may perform a blind redirection to enter the protection procedure. Table 8-8 lists the counter related to the number of times that the Issue 02 (2016-04-20)

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eNodeB enters the protection procedure for CSFB. A larger value of this counter indicates a longer average UE access delay during CSFB. Table 8-8 Counter related to the number of times that the eNodeB enters the protection procedure for CSFB Counter ID

Counter Name

Description

1526729515

L.RRCRedirectio n.E2W.CSFB.Tim eOut

Number of CSFB-based blind redirections from E-UTRAN to WCDMA network caused by CSFB protection timer expiration

Table 8-9 lists the counters related to CSFB for emergency calls. Table 8-9 Counters related to CSFB for emergency calls Counter ID

Counter Name

Description

1526729510

L.IRATHO.E2W. CSFB.ExecAttOu t.Emergency

Number of CSFB-based handover execution attempts to WCDMA network triggered for emergency calls

1526729511

L.IRATHO.E2W. CSFB.ExecSuccO ut.Emergency

Number of successful CSFB-based handover executions to WCDMA network triggered for emergency calls

The formula for calculating the CSFB handover success rate for emergency calls is as follows: CSFB handover success rate for emergency calls = L.IRATHO.E2W.CSFB.ExecSuccOut.Emergency/ L.IRATHO.E2W.CSFB.ExecAttOut.Emergency

8.1.9 Parameter Optimization CSFB end-to-end delay includes the processing time at the LTE side and that at the target side of fallback. Processing at any side may affect the CSFB end-to-end delay and user experience. l

If GSM devices are provided by Huawei, for details about processing at the GSM side, see Interoperability Between GSM and LTE Feature Parameter Description.

If UMTS devices are provided by Huawei, for details about processing at the UMTS side, see Interoperability Between UMTS and LTE Feature Parameter Description.

Blind Handover for CSFB Compared with measurement-based handovers, blind handovers reduce access delays but affect handover success rates. The following table describes the parameters in the CSFallBackBlindHoCfg MO used to set the blind-handover priorities of different RATs for CSFB. Issue 02 (2016-04-20)

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Parameter Name

Parameter ID

Data Source

Setting Notes

CN Operator ID

CSFallBac kBlindHo Cfg.CnOpe ratorId

Network plan (negotiatio n not required)

Set this parameter based on the network plan. This parameter specifies the ID of the operator whose RAT blind-handover priorities are to be set.

Highest priority InterRat

CSFallBac kBlindHo Cfg.InterR atHighestP ri

Network plan (negotiatio n not required)

Set this parameter based on the network plan. This parameter is set to UTRAN by default and specifies the highest-priority RAT to be considered in blind handovers for CSFB.

Second priority InterRat

CSFallBac kBlindHo Cfg.InterR atSecondP ri

Network plan (negotiatio n not required)

Lowest priority InterRat

CSFallBac kBlindHo Cfg.InterR atLowestPr i

Network plan (negotiatio n not required)

The following table describes the parameters that must be set in the ENodeBAlgoSwitch and CellHoParaCfg MOs to set eNodeB- and cell-level blind handovers. Parameter Name

Paramete r ID

Data Source

Setting Notes

Handover Mode switch

ENodeBA lgoSwitch. HoModeS witch

Network plan (negotiati on not required)

To activate blind handovers, select the BlindHoSwitch(BlindHoSwitch) option. A blind handover to an inter-RAT cell can be performed only if a blind-handover priority is specified for the inter-RAT cell. Compared with measurement-based handovers, blind handovers reduce access delays but affect handover success rates. To deactivate blind handovers, clear the BlindHoSwitch(BlindHoSwitch) option.

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Parameter Name

Paramete r ID

Data Source

Setting Notes

Handover Mode switch

CellHoPar aCfg.HoM odeSwitch

Network plan (negotiati on not required)

Measurement-based Handovers for CSFB An appropriate event B1 threshold for CSFB ensures that inter-RAT handovers are triggered in a timely fashion. A high threshold results in a low probability of triggering event B1, thereby affecting user experience. A low threshold results in a high probability of triggering event B1, but causes a high probability of incorrect handover decisions and a low handover success rate. Tune this parameter based on site conditions. Event B1 for CSFB has a time-to-trigger parameter. This parameter lowers the probability of incorrect handover decisions and raises the handover success rate. However, if the value of this parameter is too large, CSFB delay is extended, affecting user experience. Tune this parameter based on site conditions. Appropriate settings of the threshold and time-to-trigger for event B1 raise the handover success rate and lower the call drop rate. The following table describes the parameters that must be set in the CSFallBackHo MO. Related parameters are in the CSFallBackHo MO.

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Paramet er Name

Parameter ID

Data Source

Setting Notes

Local cell ID

CSFallBac kHo.Local CellId

Network plan (negotiatio n not required)

Set this parameter based on the network plan.

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Paramet er Name

Parameter ID

Data Source

Setting Notes

CSFB Utran EventB1 Time To Trig

CSFallBac kHo.CsfbH oUtranTim eToTrig

Network plan (negotiatio n not required)

Set this parameter based on the network plan. This parameter specifies the time-to-trigger for event B1 in CSFB to UTRAN. When CSFB to UTRAN is required, set this parameter, which is used by UEs as one of the conditions for triggering event B1. When a UE detects that the signal quality in at least one UTRAN cell meets the entering condition, it does not immediately send a measurement report to the eNodeB. Instead, the UE sends a measurement report only when the signal quality has been meeting the entering condition throughout a period defined by this parameter. This parameter helps decrease the number of occasionally triggered event reports, the average number of handovers, and the number of incorrect handovers, preventing unnecessary handovers.

CSFB UTRAN EventB1 RSCP Trigger Threshold

CSFallBac kHo.CsfbH oUtranB1T hdRscp

Network plan (negotiatio n not required)

Set this parameter based on the network plan. This parameter specifies the RSCP threshold for event B1 in CSFB to UTRAN. When CSFB to UTRAN is required, set this parameter, which is used by UEs as one of the conditions for triggering event B1. This parameter specifies the minimum required RSCP of the signal quality provided by a UTRAN cell when a CSFB procedure can be initiated toward this cell. Event B1 is triggered when the RSCP measured by the UE is higher than the value of this parameter and all other conditions are also met.

CSFB UTRAN EventB1 ECN0 Trigger Threshold

CSFallBac kHo.CsfbH oUtranB1T hdEcn0

Network plan (negotiatio n not required)

Indicates the Ec/No threshold for event B1, which is used in CS fallback to UTRAN. When CSFB to UTRAN is required, set this parameter, which is used by UEs as one of the conditions for triggering event B1. This parameter specifies the minimum required Ec/No of the signal quality provided by a UTRAN cell when a CSFB procedure can be initiated toward this cell. Event B1 is triggered when the Ec/No measured by the UE is higher than the value of this parameter and all other conditions are also met. Set this parameter to a large value for a cell with a large signal fading variance in order to reduce the probability of unnecessary handovers. Set this parameter to a small value for a cell with a small signal fading variance in order to ensure timely handovers.

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8.2 RIM Procedure from E-UTRAN to UTRAN 8.2.1 When to Use RIM Procedure from E-UTRAN to UTRAN It is recommended that the RIM procedure be performed through the Huawei-proprietary eCoordinator when the following conditions are met: l

Both the eNodeB and the RNC/BSC are provided by Huawei and are connected to the same eCoordinator.

The core network that the eNodeB and the RNC/BSC are connected to does not support the RIM procedure or is not enabled with the RIM procedure.

To perform the RIM procedure through the eCoordinator, set ENodeBAlgoSwitch.RimOnEcoSwitch to ON(On). In other conditions, it is recommended that the RIM procedure be performed through the core network. In this case, set ENodeBAlgoSwitch.RimOnEcoSwitch to OFF(Off). If load-based CSFB to UTRAN is used, you need to obtain load information about UTRAN cells through the RIM procedures. If flash CSFB to UTRAN is used, you need to obtain system information about UTRAN cells through the RIM procedures.

8.2.2 Required Information Check whether the RNC, MME, and SGSN support the RIM procedure, and whether an eCoordinator has been deployed.

8.2.3 Requirements Operating Environment If the RIM procedure is performed through the core network, the core-network equipment must support this feature: l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 9. Check that software versions for the EPC are correct.

If the RIM procedure is performed through the eCoordinator, the RNC/BSC, eNodeB, and eCoordinator must all be provided by Huawei and with the switch for supporting the RIM procedure through eCoordinator turned on. To facilitate connection setup for RIM message exchange, you must enable RIM in the UTRAN before you enable it in the E-UTRAN.

License The operator has purchased and activated the licenses for the features listed in Table 8-10. Issue 02 (2016-04-20)

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Table 8-10 License control item for CSFB to UTRAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD-001 033

CS Fallback to UTRAN

LT1ST0C FBU00

CS Fallback to UTRAN(TD D)

eNodeB

per RRC Connected User

NOTE

If the UTRAN uses Huawei devices, corresponding licenses need to be activated. For details, see the engineering guidelines for WRFD-150231 RIM Based UMTS Target Cell Selection for LTE in Interoperability Between UMTS and LTE Feature Parameter Description.

8.2.4 Precautions None

8.2.5 Data Preparation and Feature Activation 8.2.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data The required data is the same as that for TDLOFD-001033 CS Fallback to UTRAN. For details, see 8.1.5.1 Data Preparation. UtranExternalCell: used to configure external UTRAN cells. The UtranExternalCell.Rac parameter must be set.

Scenario-specific Data The following table describes the parameter that must be set in the ENodeBAlgoSwitch MO to configure the RIM procedure. Issue 02 (2016-04-20)

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Parameter Name

Parameter ID

Data Source

Setting Notes

Support RIM by eCoordinator Switch

ENodeBAlg oSwitch.Rim OnEcoSwitc h

Network plan (negotiatio n not required)

If ENodeBAlgoSwitch.RimOnEcoSwitch is set to OFF(Off), the RIM procedure is performed through the core network. If ENodeBAlgoSwitch.RimOnEcoSwitch is set to ON(On), the RIM procedure is performed through the eCoordinator.

8.2.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.2.5.3 Using MML Commands Using MML Commands l

Performing the RIM procedure through the core network Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to OFF(Off).

Performing the RIM procedure through the eCoordinator Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to ON(On).

MML Command Examples l

Performing the RIM procedure through the core network MOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;

Performing the RIM procedure through the eCoordinator MOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;

8.2.6 Activation Observation Counter Observation No matter whether the RIM procedure is performed through the core network or the eCoordinator, performance counters listed in Table 8-11 can be used to observe whether the RIM procedure has taken effect. Table 8-11 Counters related to the RIM procedure between E-UTRAN and UTRAN

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Counter ID

Counter Name

Description

1526728949

L.RIM.Load.E2W. Req

Number of load information requests from an eNodeB to WCDMA network

1526728950

L.RIM.Load.E2W. Resp

Number of times the eNodeB receives load information responses from WCDMA network

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Counter ID

Counter Name

Description

1526728951

L.RIM.Load.E2W. Update

Number of times the eNodeB receives load information updates from WCDMA network

Signaling Tracing Result Observation If the RIM procedure is performed through the core network, trace signaling messages as follows: Step 1 Start an S1 interface tracing task on the eNodeB LMT. Check whether the ENB DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION-REQUEST IE is sent over the S1 interface. If the message is sent, you can infer that the eNodeB has sent the RIM request successfully. Step 2 Start an Iu interface tracing task on the RNC LMT. If after receiving the DIRECT INFORMATION TRANSFER message containing the RANINFORMATION-REQUEST IE, the RNC sends the DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION IE to the SGSN, you can infer that the RNC can response to the RIM request normally. Step 3 Change the state of the UTRAN cell. If the RNC sends the DIRECT INFORMATION TRANSFER message containing the RANINFORMATION IE over the Iu interface, you can infer that the RNC can notify the eNodeB with the cell state change through the RIM procedure. ----End If the RIM procedure is performed through the eCoordinator, trace signaling messages as follows: Step 1 Start an Se interface tracing task on the eNodeB LMT. Check whether the ENB DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION-REQUEST IE is sent over the Se interface. If the message is sent, you can infer that the eNodeB has sent the RIM request successfully. Step 2 Start an Sr interface tracing task on the RNC LMT. If after receiving the ECO DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION-REQUEST IE, the RNC sends the RNC DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION IE to the eCoordinator, you can infer that the RNC can response to the RIM request normally. Step 3 Change the state of the UTRAN cell. If the RNC sends the RNC DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION IE over the Sr interface, you can infer that the RNC can notify the eNodeB with the cell state change through the RIM procedure. ----End Issue 02 (2016-04-20)

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8.2.7 Deactivation Table 8-12 describes the parameters for deactivating this feature. Table 8-12 Parameters for the RIM procedure MO

Parameter Group

Setting Notes

ENodeBAlgoSwitch (eNodeB-level switch)

RimOnEcoSwitch

Set this parameter to OFF(Off).

This feature can be deactivated using the CME or MML commands.

8.2.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.2.7.2 Using MML Commands Using MML Commands l

Performing the RIM procedure through the core network Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to ON(On).

Performing the RIM procedure through the eCoordinator Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to OFF(Off).

MML Command Examples l

Performing the RIM procedure through the core network MOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;

Performing the RIM procedure through the eCoordinator MOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;

8.2.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.8 Performance Monitoring.

8.2.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization.

8.3 TDLOFD-001052 Flash CS Fallback to UTRAN This section provides engineering guidelines for TDLOFD-001052 Flash CS Fallback to UTRAN. Issue 02 (2016-04-20)

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8.3.1 When to Use Flash CS Fallback to UTRAN When TDLOFD-001033 CS Fallback to UTRAN has been enabled, use TDLOFD-001052 Flash CS Fallback to UTRAN if all the following conditions are met: Use this feature when the following conditions are met: l

TDLOFD-001033 CS Fallback to UTRAN has been enabled.

The E-UTRAN and UTRAN support the RIM with SIB procedure.

There are UEs that comply with 3GPP Release 9.

The core networks support the RIM procedure or the eCoordinator has been deployed.

8.3.2 Required Information 1.

Collect information about whether TDLOFD-001033 CS Fallback to UTRAN has been activated.

Collect the versions and configurations of the NEs in the E-UTRAN, UTRAN, and core networks, and ensure that they all support CSFB and the RIM procedure. Table 8-13 describes the requirements of flash CSFB to UTRAN for the core networks. For details about the deployment guide on the UTRAN, see Interoperability Between UMTS and LTE Feature Parameter Description.

Collect the following information about the UEs that support UMTS and LTE on the live network: –

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to UTRAN

–

Whether the UEs support PS handover from E-UTRAN to UTRAN

–

Whether the UEs support UTRAN measurements

–

Whether the UEs comply with 3GPP Release 9 specifications

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Requirement

MME

Supports CSFB and RIM procedures in compliance with 3GPP Release 9

SGSN

Supports CSFB and RIM procedures in compliance with 3GPP Release 9

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8.3.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 9. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-14. Table 8-14 License control item for Flash CS Fallback to UTRAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD-001 052

Flash CSFB to UTRAN

LT1SFCS FUT00

Flash CS Fallback to UTRAN

eNodeB

per RRC Connected User

NOTE

If the UTRAN uses Huawei devices, RIM-based flash CSFB needs to be enabled on the UTRAN. For details, see Flash CS Fallback Based on RIM Feature Parameter Description.

8.3.4 Precautions None

8.3.5 Data Preparation and Feature Activation 8.3.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data Before configuring CSFB to UTRAN, collect the data related to neighbor relationships with UTRAN cells. This section provides only the information about MOs related to neighboring Issue 02 (2016-04-20)

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UTRAN cells and key parameters in these MOs. For more information about how to collect data for the parameters in these MOs, see Inter-RAT Mobility Management in Connected Mode Feature Parameter Description. Collect data for the parameters in the following MOs: 1.

UtranNFreq: used to configure neighboring UTRAN frequencies.

UtranExternalCell: used to configure external UTRAN cells. The UtranExternalCell.Rac parameter must be set.

Scenario-specific Data The following table describes the parameters that must be set in the CellAlgoSwitch, CellHoParaCfg, and ENodeBAlgoSwitch MOs to set the handover mode and handover algorithm switches for flash CSFB to UTRAN.

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Parameter Name

Parameter ID

Data Source

Setting Notes

Handover Mode switch

CellHoPara Cfg.HoMod eSwitch

Network plan (negotiation not required)

Set this parameter based on the network plan.

Handover Allowed Switch

CellAlgoSw itch.HoAllo wedSwitch

Network plan (negotiation not required)

To activate CSFB to UTRAN, select the UtranCsfbSwitch(UtranCsfbSwitch) and UtranFlashCsfbSwitch(UtranFlashCsfbSwitch) options.

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Parameter Name

Parameter ID

Data Source

Setting Notes

RIM switch

ENodeBAlg oSwitch.Ri mSwitch

Network plan (negotiation not required)

UTRAN_RIM_SWITCH(UTRAN RIM Switch) of this parameter specifies whether to enable or disable the RIM procedure that requests eventdriven multiple reports from UTRAN cells. If this switch is turned on, the eNodeB can send RAN-INFORMATIONREQUEST/Multiple Report protocol data units (PDUs) to UTRAN cells to request event-driven multiple reports. If this switch is turned off, the eNodeB cannot send RAN-INFORMATIONREQUEST/Multiple Report PDUs to UTRAN cells. If this switch is turned off and UtranFlashCsfbSwitch(UtranFlashCsfbSwitch) of ENodeBAlgoSwitch.HoAlgoSwitch is turned on, the eNodeB sends RANINFORMATION-REQUEST/Single Report PDUs to UTRAN cells to request single reports. If the UTRAN cells support RANINFORMATION-REQUEST/Multiple Report PDUs, you are advised to select the UTRAN_RIM_SWITCH(UTRAN RIM Switch) option.

The following table describes the parameters that must be set in the ENodeBAlgoSwitch and CellHoParaCfg MOs to set eNodeB- and cell-level blind handover switches.

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Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handove r Mode switch

ENodeB AlgoSwi tch.Ho ModeSw itch

Network plan (negotiation not required)

Handove r Mode switch

CellHo ParaCf g.HoMo deSwitc h

Network plan (negotiation not required)

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The following table describes the parameter that must be set in the S1Interface MO to set the compliance protocol release of the MME. Parameter Name

Parameter ID

Data Source

Setting Notes

MME Release

S1Interface.MmeRe lease

Network plan (negotiation not required)

To activate RIM procedures in Multiple Report mode, set the parameter to Release_R9(Releas e 9).

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB.

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Parameter Name

Paramet er ID

Data Source

Setting Notes

CN Operator ID

CSFallB ackBlind HoCfg.C nOperato rId

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter identifies the operator whose RAT blind-handover priorities are to be set.

Highest priority InterRat

CSFallB ackBlind HoCfg.In terRatHi ghestPri

Network plan (negotiation not required)

Second priority InterRat

CSFallB ackBlind HoCfg.In terRatSec ondPri

Network plan (negotiation not required)

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Parameter Name

Paramet er ID

Data Source

Setting Notes

Lowest priority InterRat

CSFallB ackBlind HoCfg.In terRatLo westPri

Network plan (negotiation not required)

UTRAN LCS capability

CSFallB ackBlind HoCfg.U tranLcsC ap

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter specifies the LCS capability of the UTRAN.

The following table describes the parameter that must be set in the InterRatHoComm MO to set the maximum number of neighboring UTRAN cells whose system information is sent to UEs for flash redirections. Paramete r Name

Paramete r ID

Data Source

Setting Notes

Max Utran cell num in redirection

InterRatH oComm.C ellInfoMa xUtranCel lNum

Network plan (negotiation not required)

Set this parameter based on the network plan. The default value is 8. If this parameter is set to a small value, the flash CSFB success rate decreases because UEs may not receive valid neighboring cell system information. If this parameter is set to a large value, the size of an RRC connection release message increases and CSFB may fail.

Max Utran cell num in CSFB EMC redirection

InterRatH oComm.U tranCellN umForEm cRedirect

Network plan (negotiation not required)

To use flash CSFB for emergency blind redirection, change the parameter value from the default value 0 to a non-zero value.

8.3.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.3.5.3 Using MML Commands Using MML Commands The prerequisite is that CSFB to UTRAN has been activated. Issue 02 (2016-04-20)

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Step 1 (Optional) Run the MOD GLOBALPROCSWITCH command to set the RIM Coding Policy parameter. If the peer device is a Huawei device, go to Step 3. If the peer device is not a Huawei device, you need to modify the RIM Coding Policy feature. Run the MOD GLOBALPROCSWITCH command to set the RIM Coding Policy parameter to StandardCoding. Step 2 Run the MOD CELLALGOSWITCH command with the UtranFlashCsfbSwitch(UtranFlashCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

In addition, this function is controlled by the UtranFlashCsfbSwitch option of the ENodeBAlgoSwitch.HoAlgoSwitch parameter. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that the eNodeB-level parameter be turned off and the cell-level parameter be used.

Step 3 Run the MOD ENODEBALGOSWITCH command with the UTRAN_RIM_SWITCH(UTRAN RIM Switch) option of the RIM switch parameter selected. Step 4 Run the MOD S1INTERFACE command with the MME Release parameter set to Release_R9(Release 9). Step 5 (Optional) Run the MOD INTERRATHOCOMM command with the Max Utran cell num in redirection parameter set (its default value is 8). Step 6 (Optional) Run the MOD INTERRATHOCOMM command with the Max Utran cell num in CSFB EMC redirection parameter set, for example, to 3. ----End

MML Command Examples MOD GLOBALPROCSWITCH: RimCodingPolicy=PrivateCoding; MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=UtranFlashCsfbSwitch-1; MOD ENODEBALGOSWITCH: RimSwitch=UTRAN_RIM_SWITCH-1; MOD S1INTERFACE: S1InterfaceId=2,S1CpBearerId=1,CnOperatorId=0,MmeRelease=Release_R9; MOD INTERRATHOCOMM: CellInfoMaxUtranCellNum=8; MOD INTERRATHOCOMM: UtranCellNumForEmcRedirect=3;

8.3.6 Activation Observation Signaling Observation Enable a UE to camp on an E-UTRAN cell and make a voice call. If the call continues and the RRC Connection Release message traced on the Uu interface carries the information about neighboring UTRAN cells, flash CSFB to UTRAN has been activated. The signaling procedure for flash CSFB to UTRAN is similar to that for redirection-based CSFB to UTRAN described in 8.1.6 Activation Observation. The difference is that the RRC Connection Release message carries the information about neighboring UTRAN cells. Issue 02 (2016-04-20)

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MML Command Observation Check the status of the RIM procedure towards neighboring UTRAN cells by running the DSP UTRANRIMINFO command. If the ID of a neighboring UTRAN cell is displayed in the command output, the eNodeB has obtained the system information of this neighboring UTRAN cell.

Counter Observation Table 8-15 lists the performance counters for observing functions related to flash CSFB to UTRAN. Table 8-15 Performance counters for observing flash CSFB to UTRAN Function

Counter ID

Counter Name

Description

Flash CSFB to UTRAN

152672870 5

L.FlashCSFB.E2W

Number of times flash CSFB to UTRAN is performed

RIM during flash CSFB to UTRAN

152672894 6

L.RIM.SI.E2W.Req

Number of system information requests sent from an eNodeB to a UMTS network

152672894 7

L.RIM.SI.E2W.Resp

Number of system information responses sent from a UMTS network to an eNodeB

152672894 8

L.RIM.SI.E2W.Update

Number of system information updates sent from a UMTS network to an eNodeB

8.3.7 Deactivation Table 8-16 describes the parameters for deactivating this feature. Table 8-16 Parameters for deactivating flash CSFB to UTRAN MO

Parameter Group

Setting Notes

CellAlgoSwitch

HoAllowedSwitch

Set UtranFlashCsfbSwitch of the HoAlgoSwitch parameter to 0.

This feature can be deactivated using the CME or MML commands.

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8.3.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.3.7.2 Using MML Commands Using MML Commands Run the MOD CELLALGOSWITCH command with the UtranFlashCsfbSwitch(UtranFlashCsfbSwitch) option of the Handover Allowed Switch parameter cleared.

MML Command Examples MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch =UtranFlashCsfbSwitch-0;

8.3.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.8 Performance Monitoring.

8.3.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization.

8.4 TDLOFD-081223 Ultra-Flash CSFB to UTRAN 8.4.1 When to Use Ultra-Flash CSFB to UTRAN When TDLOFD-001033 CS Fallback to UTRAN has been enabled, this feature is recommended in scenarios where the eNodeB, RNC, MME, and MSC are provided by Huawei, and a proportion of of UEs in the live network support SRVCC from E-UTRAN to UTRAN. Use this feature in the overlapping coverage of UMTS and LTE networks when the following conditions are met: l

TDLOFD-001033 CS Fallback to UTRAN has been enabled.

The eNodeB, RNC, MME, and MSC are provided by Huawei.

A proportion of UEs support SRVCC from E-UTRAN to UTRAN.

8.4.2 Required Information Before deploying this feature, ensure that: l

TDLOFD-001033 CS Fallback to UTRAN has been enabled.

The eNodeB, RNC, MME, and MSC are provided by Huawei and they all support this feature.

A proportion of UEs support SRVCC from E-UTRAN to UTRAN.

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8.4.3 Requirements Operating Environment This feature is a Huawei-proprietary feature and requires that the UTRAN, eNodeB, RNC, MME, and MSC be provided by Huawei and support this feature. This feature is used with MME11.0 and MSC11.0.

License The operator has purchased and activated the license for the feature listed in Table 8-17. Table 8-17 License information for ultra-flash CSFB to UTRAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD-081 223

Ultra-Flash CSFB to UTRAN(TDD)

LT1SUFC FBU00

Ultra-Flash CSFB to UTRAN(TD D)

eNodeB

per RRC Connected User

NOTE

The license for ultra-flash CSFB needs to be purchased and activated on the UTRAN. For detailed operations, see the following section in Interoperability Between UMTS and LTE Feature Parameter Description: Engineering Guidelines > WRFD-160271 Ultra-Flash CSFB.

8.4.4 Precautions This feature is a Huawei-proprietary feature and is not supported by devices provided by other vendors. In addition, this feature must first be activated on the RNC, MME, and MSC, and then be activated on the eNodeB. This is because this feature is triggered by the eNodeB and this avoids CSFB failures.

8.4.5 Data Preparation and Feature Activation 8.4.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

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User-defined: parameter values set by users

Required Data The required data is the same as that for TDLOFD-001033 CS Fallback to UTRAN. For details, see 8.1.5.1 Data Preparation.

Scenario-specific Data The following table describes the parameter that must be set in the ENodeBAlgoSwitch MO to set the handover mode and handover algorithm switch for ultra-flash CSFB to UTRAN. Parameter Name

Parameter ID

Data Source

Setting Notes

Handover Algo switch

ENodeBAl goSwitch. HoAlgoSw itch

Network plan (negotiation not required)

Select the UtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbSwitch) option.

The following table describes the parameter that must be set in the GlobalProcSwitch MO to turn on the UE compatibility switch when UEs do not support Ultra-Flash CSFB, resulting in UE compatibility problems. Paramet er Name

Parame ter ID

Data Source

Setting Notes

Ue Compati bility Switch

GlobalP rocSwit ch.UeC ompatS witch

Network plan (negotiation required)

Select the UltraFlashCsfbComOptSw option of the parameter when UEs on the network do not support ultra-flash CSFB. When the MME provided by Huawei allows IMEI whitelist configurations for ultra-flash CSFB and the option is selected, the eNodeB performs ultra-flash CSFB on UEs in the IMEI whitelist. Therefore, delete the UEs that do not support ultra-flash CSFB from the whitelist before selecting the option. Otherwise, keep the option unselected.

The following table describes the parameter that must be set in the CellHoParaCfg MO to disable blind handover for UEs supporting ultra-flash CSFB after the blind handover function takes effect.

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Paramete r Name

Parame ter ID

Data Source

Setting Notes

Handover Mode switch

CellHo ParaCf g.HoMo deSwitc h

Network plan (negotiation not required)

Select the UFCsfbBlindHoDisSwitch option if you want to disable blind handover and enable measurement-based handover for UEs supporting ultra-flash CSFB when the blind handover function takes effect. If this option is cleared, the blind handover function for UEs supporting ultra-flash CSFB that takes effect still persists.

8.4.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.4.5.3 Using MML Commands Using MML Commands l

Ultra-Flash CSFB to UTRAN

Step 1 Run MML commands to configure neighboring UTRAN frequencies and UTRAN cells. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode. Step 2 Run the MOD ENODEBALGOSWITCH command with the UtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbSwitch) option of the Handover Algo switch parameter selected. ----End l

(Optional) If some operators or RNCs do not support ultra-flash CSFB to UTRAN, perform the following operations:

Step 1 Run the MOD ENODEBALGOSWITCH command with the UtranSepOpMobilitySwitch(UtranSepOpMobilitySwitch) option of the Multi-Operator Control Switch parameter selected. Step 2 Run the MOD UTRANNETWORKCAPCFG command with the UltraFlashCsfbCapCfg(UltraFlashCsfbCapCfg) option of the Network Capability Configuration parameter cleared for RNCs that do not support ultra-flash CSFB to UTRAN. ----End l

(Optional) Perform the following operation if UE compatibility risks exist after ultraflash CSFB is activated.

Step 1 Run the MOD GLOBALPROCSWITCH command with the UltraFlashCsfbComOptSw(UltraFlashCsfbComOptSw) option of the UE Compatibility Switch parameter selected. ----End Issue 02 (2016-04-20)

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(Optional) Perform the following operation if you need to disable blind handover and enable measurement-based handover for UEs supporting ultra-flash CSFB after the blind handover function takes effect.

Step 1 Run the MOD CELLHOPARACFG command with the UFCsfbBlindHoDisSwitch option of the Handover Mode switch parameter selected. ----End

MML Command Examples l

Ultra-Flash CSFB to UTRAN MOD ENODEBALGOSWITCH: HoAlgoSwitch= UtranUltraFlashCsfbSwitch-1;

(Optional) If RNCs do not support ultra-flash CSFB to UTRAN, perform the following operations: MOD ENODEBALGOSWITCH: MultiOpCtrlSwitch= UtranSepOpMobilitySwitch-1; MOD UTRANNETWORKCAPCFG: Mcc="460", Mnc="32", RncId=0, NetworkCapCfg= UltraFlashCsfbCapCfg-0; ADD UTRANNETWORKCAPCFG: Mcc="460", Mnc="32", RncId=0, NetworkCapCfg= UltraFlashCsfbCapCfg-0; MOD ENODEBALGOSWITCH: MultiOpCtrlSwitch= UtranSepOpMobilitySwitch-1;

(Optional) Perform the following operation if UE compatibility risks exist after ultraflash CSFB is activated. MOD GLOBALPROCSWITCH: UeCompatSwitch= UltraFlashCsfbComOptSw-1;

8.4.6 Activation Observation Signaling Observation The activation observation procedure for ultra-flash CSFB to UTRAN is as follows: 1.

Enable a UE to camp on an E-UTRAN cell and originate a voice call so that the UE falls back to a UTRAN cell and completes the call.

Enable a UE to camp on an E-UTRAN cell and receive a voice call so that the UE falls back to a UTRAN cell and completes the call.

Figure 8-6 shows the ultra-flash CSFB to UTRAN signaling procedure for a mobileoriginated call. Figure 8-7 shows the ultra-flash CSFB to UTRAN signaling procedure for a mobileterminated call. The UEs in the left and right sides of the figure are the same UE. The messages on the UTRAN side are only for reference. The UE was in idle mode before the call. If the UE capability is not included in the Initial Context Setup Request (Initial Context Setup Req in the figures) message, the eNodeB initiates a UE capability transfer procedure immediately after receiving this message from the MME. If the UE capability is included in the Initial Context Setup Request message, the eNodeB initiates a UE capability transfer procedure after sending an Initial Context Setup Response (Initial Context Setup Rsp in the figures) message to the MME. Issue 02 (2016-04-20)

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Figure 8-6 Ultra-flash CSFB to UTRAN signaling procedure for a mobile-originated call

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Figure 8-7 Ultra-flash CSFB to UTRAN signaling procedure for a mobile-terminated call

Counter Observation The counter listed in Table 8-18 can be viewed to check whether the feature has taken effect.

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Table 8-18 Counter related to ultra-flash CSFB to UTRAN Counter ID

Counter Name

Description

1526730147

L.IRATHO.CSFB.S RVCC.E2W.ExecAt tOut

Triggered by ultra-flash CSFB Number of SRVCC-based outgoing handover executions from E-UTRAN to WCDMA network for ultra-flash CSFB to UTRAN

8.4.7 Deactivation Table 8-19 describes the parameters for deactivating this feature. Table 8-19 Parameters for ultra-flash CSFB to UTRAN MO

Parameter Group

Setting Notes

ENodeBAlgoSwitch (eNodeB-level switch)

HoAlgoSwitch

Clear the UtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbSwitch) option.

This feature can be deactivated using the CME or MML commands.

8.4.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.4.7.2 Using MML Commands Using MML Commands Run the MOD ENODEBALGOSWITCH command with the UtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbSwitch) option of the Handover Algo switch parameter cleared.

MML Command Examples MOD ENODEBALGOSWITCH: HoAlgoSwitch=UtranUltraFlashCsfbSwitch-0;

8.4.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.8 Performance Monitoring. Table 8-20 describes performance counters related to ultra-flash CSFB.

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Table 8-20 Performance counters related to ultra-flash CSFB Counter ID

Counter Name

Description

1526730146

L.IRATHO.CSFB.S RVCC.E2W.PrepAt tOut

Number of SRVCC-based outgoing handover attempts from E-UTRAN to WCDMA network for ultra-flash CSFB

1526730147

L.IRATHO.CSFB.S RVCC.E2W.ExecAt tOut

Number of SRVCC-based outgoing handover executions from E-UTRAN to WCDMA network for ultra-flash CSFB

1526730148

L.IRATHO.CSFB.S RVCC.E2W.ExecS uccOut

Number of successful SRVCC-based outgoing handovers from E-UTRAN to WCDMA network for ultra-flash CSFB

1526736728

L.IRATHO.CSFB.S RVCC.E2W.MME AbnormRsp

Number of responses for abnormal causes received by the eNodeB from the MME during handovers from the E-UTRAN to WCDMA networks for ultra-flash CSFB

Execution success rate of handovers for ultra-flash CSFB to UTRAN = (L.IRATHO.CSFB.SRVCC.E2W.ExecSuccOut L.IRATHO.CSFB.SRVCC.E2W.MMEAbnormRsp)/ L.IRATHO.CSFB.SRVCC.E2W.PrepAttOut

8.4.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization.

8.5 TDLOFD-001068 CS Fallback with LAI to UTRAN This section provides engineering guidelines for TDLOFD-001068 CS Fallback with LAI to UTRAN.

8.5.1 When to Use CS Fallback with LAI to UTRAN Use this feature when the following conditions are met: l

TDLOFD-001033 CS Fallback to UTRAN has been enabled.

The E-UTRAN cell has neighboring UTRAN cells that belong to different PLMNs and supports inter-PLMN handovers, or the E-UTRAN cell has neighboring UTRAN cells that have different location area codes (LACs).

If both TDLOFD-001033 CS Fallback to UTRAN and TDLOFD-001034 CS Fallback to GERAN have been enabled, you are advised to enable both TDLOFD-001068 CS Fallback with LAI to UTRAN and TDLOFD-001069 CS Fallback with LAI to GERAN.

8.5.2 Required Information 1.

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Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN and UTRAN cells.

Collect the versions and configurations of the NEs in the E-UTRAN, UTRAN, and core networks, and ensure that they all support CSFB and the MME supports LAI delivery. Table 8-21 describes the requirements of CSFB with LAI to UTRAN for the core networks.

Collect the following information about the UEs that support UMTS and LTE on the live network: –

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to UTRAN

–

Whether the UEs support PS handover from E-UTRAN to UTRAN

–

Whether the UEs support UTRAN measurements

Requirement

MME

MSC

l Supports combined EPS/IMSI attach. l Supports SMS over SGs. l Forwards paging messages transmitted through the SGs interface.

SGSN

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8.5.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-22. Table 8-22 License information for CSFB with LAI to UTRAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD -001068

CS Fallback with LAI to UTRAN

LT1SUC SLAI00

CS Fallback with LAI to UTRAN

eNode B

per RRC Connected User

8.5.4 Precautions None

8.5.5 Data Preparation and Feature Activation CSFB with LAI to UTRAN is automatically activated when two conditions are met: The license for this feature has been purchased. CSFB to UTRAN has been activated.

8.5.5.1 Data Preparation Data preparation for activating CSFB with LAI to UTRAN is the same as that for activating CSFB to UTRAN. For details, see 8.1.5.1 Data Preparation.

8.5.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.5.5.3 Using MML Commands For details, see 8.1.5.3 Using MML Commands.

8.5.6 Activation Observation The activation observation procedure is as follows: 1.

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Ensure that the signal strengths of the two UTRAN cells both reach the threshold for event B1. You can query the threshold by running the LST INTERRATHOUTRANGROUP command.

Enable a UE to camp on an E-UTRAN cell and originate a voice call so that the UE falls back to the UTRAN cell with the specified LAI and completes the call.

Enable the UE to camp on the E-UTRAN cell and receive a voice call so that the UE falls back to the UTRAN cell with the specified LAI and completes the call. You can observe the signaling procedure for CSFB with LAI to UTRAN, which is similar to that for CSFB to UTRAN described in 8.1.6 Activation Observation. The difference is that the Initial Context Setup Request or UE Context Mod Request message carries the LAI that the MME delivers to the eNodeB, as shown in the following figure: Figure 8-8 LAI signaling tracing

8.5.7 Deactivation TDLOFD-001068 CS Fallback with LAI to UTRAN is automatically deactivated when its license or CSFB to UTRAN is deactivated. For details about how to deactivate CSFB to UTRAN, see 8.1.7 Deactivation.

8.5.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.8 Performance Monitoring. You can observe delivered frequencies or cells based on network logs.

8.5.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization.

8.6 TDLOFD-001088 CS Fallback Steering to UTRAN This section provides engineering guidelines for TDLOFD-001088 CS Fallback Steering to UTRAN.

8.6.1 When to Use CS Fallback Steering to UTRAN Use this feature to improve the network efficiency when the following conditions are met: l Issue 02 (2016-04-20)

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An operator owns multiple UTRAN frequencies or the operator has different handover policies for CS-only services and combined CS+PS services.

If the operator owns both UTRAN and GERAN, you can also activate TDLOFD-001089 CS Fallback Steering to GERAN to improve the network efficiency.

8.6.2 Required Information 1.

Collect information about whether TDLOFD-001033 CS Fallback to UTRAN has been activated.

Collect the following information about the UEs that support UMTS and LTE on the live network: –

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to UTRAN

–

Whether the UEs support PS handover from E-UTRAN to UTRAN

–

Whether the UEs support UTRAN measurements

Collect information about the frequencies and frequency policies of the UTRAN. The frequency policies for UTRAN and E-UTRAN must be the same. For example, if F1 is the preferred frequency for voice services on UTRAN, the same configuration is recommended for E-UTRAN.

If LOFD-001089 CS Fallback Steering to GERAN is also to be activated, consider the GERAN frequencies when making frequency policies.

8.6.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-23. Table 8-23 License information for CSFB steering to UTRAN

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Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD001088

CS Fallback Steering to UTRAN

LT1STC SFSU00

CS Fallback Steering to UTRAN

eNode B

per RRC Connected User

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8.6.4 Precautions None

8.6.5 Data Preparation and Feature Activation 8.6.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data The required data is the same as that for LOFD-001033 CS Fallback to UTRAN. For details, see 8.1.5.1 Data Preparation.

Scenario-specific Data The following table describes the parameter that must be set in the CellAlgoSwitch MO to enable CSFB steering to UTRAN. Paramet er Name

Paramet er ID

Data Source

Setting Notes

Handover Allowed Switch

CellAlgo Switch.H oAllowed Switch

Network plan (negotiatio n not required)

Select the UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch) option of this parameter.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set RAT priorities for CSFB triggered for RRC_CONNECTED UEs.

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Paramet er Name

Paramete r ID

Data Source

Setting Notes

CN Operator ID

CSFallBa ckBlindH oCfg.CnO peratorId

Network plan (negotiation not required)

Set this parameter based on the network plan.

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Paramet er Name

Paramete r ID

Data Source

Setting Notes

Highest priority InterRat

CSFallBa ckBlindH oCfg.Inte rRatHigh estPri

Network plan (negotiation not required)

Second priority InterRat

CSFallBa ckBlindH oCfg.Inte rRatSeco ndPri

Network plan (negotiation not required)

Lowest priority InterRat

CSFallBa ckBlindH oCfg.Inte rRatLowe stPri

Network plan (negotiation not required)

UTRAN LCS capability

CSFallBa ckBlindH oCfg.Utra nLcsCap

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter specifies the LCS capability of the UTRAN.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set RAT priorities for CSFB triggered for RRC_IDLE UEs.

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Param eter Name

Parameter ID

Data Source

Setting Notes

CSFB Highes t priority InterRa t for Idle UE

CSFallBack BlindHoCfg. IdleCsfbHig hestPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to UTRAN by default and specifies the highest-priority RAT to be considered in CSFB for UEs in idle mode. For CSFB to UTRAN, retain the default value.

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Param eter Name

Parameter ID

Data Source

Setting Notes

CSFB Second priority InterRa t for Idle UE

CSFallBack BlindHoCfg. IdleCsfbSeco ndPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to GERAN by default and specifies the second-highest-priority RAT to be considered in CSFB for UEs in idle mode. Ensure that this parameter is set to a different value from the CSFallBackBlindHoCfg.IdleCsfbHighestPri and CSFallBackBlindHoCfg.IdleCsfbLowestPri parameters.

CSFB Lowest priority InterRa t for Idle UE

CSFallBack BlindHoCfg. IdleCsfbLow estPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to CDMA2000 by default and specifies the lowest-priority RAT to be considered in CSFB for UEs in idle mode. Ensure that this parameter is set to a different value from the CSFallBackBlindHoCfg.IdleCsfbHighestPri and CSFallBackBlindHoCfg.IdleCsfbSecondPri parameters.

The following table describes the parameters that must be set in the CELLOPHOCFG MO to set cell-level RAT priorities for CSFB triggered for RRC_CONNECTED and RRC_IDLE UEs.

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Para meter Name

Parameter ID

Data Source

Setting Notes

CN Operat or ID

CellOpHoCf g.CnOperato rId

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter identifies the operator whose RAT blindhandover priorities are to be set.

Local cell ID

CellOpHoCf g.LocalCellI d

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter identifies the cell whose RAT blindhandover priorities are to be set.

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Para meter Name

Parameter ID

Data Source

Setting Notes

Highe st priorit y InterR at

CellOpHoCf g.InterRatHi ghestPri

Networ k plan (negoti ation not require d)

Secon d priorit y InterR at

CellOpHoCf g.InterRatSe condPri

Networ k plan (negoti ation not require d)

Lowes t priorit y InterR at

CellOpHoCf g.InterRatLo westPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to CDMA2000 by default and specifies the lowest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CellOpHoCfg.InterRatHighestPri and CellOpHoCfg.InterRatSecondPri parameters.

CSFB Highe st priorit y InterR at for Idle UE

CellOpHoCf g.IdleCsfbHi ghestPri

Networ k plan (negoti ation not require d)

CSFB Secon d priorit y InterR at for Idle UE

CellOpHoCf g.IdleCsfbSe condPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to GERAN by default and specifies the second-highest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CellOpHoCfg.IdleCsfbHighestPri and CellOpHoCfg.IdleCsfbLowestPri parameters.

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Para meter Name

Parameter ID

Data Source

Setting Notes

CSFB Lowes t priorit y InterR at for Idle UE

CellOpHoCf g.IdleCsfbLo westPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to CDMA2000 by default and specifies the lowest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CellOpHoCfg.IdleCsfbHighestPri and CellOpHoCfg.IdleCsfbSecondPri parameters.

The following table describes the parameter that must be set in the UtranNFreq MO to set the CS service priority of a neighboring UTRAN frequency considered for RRC_IDLE UEs. Param eter Name

Parameter ID

Data Source

Setting Notes

CS service priority

UtranNFreq .CsPriority

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. If this parameter is set to Priority_0(Priority 0) for the UTRAN frequency, the eNodeB does not select the frequency for SRVCC. The values Priority_16(Priority 16) and Priority_1(Priority 1) indicate the highest and lowest SRVCC priority, respectively. Set a high priority for a UTRAN frequency with good coverage.

The following table describes the parameter that must be set in the UtranNFreq MO to set the CS+PS combined service priority of a neighboring UTRAN frequency for RRC_CONNECTED UEs.

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Param eter Name

Parameter ID

Data Source

Setting Notes

CS and PS mixed priority

UtranNFreq .CsPsMixed Priority

Network plan (negotiation not required)

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The following table describes the parameter that must be set in the CSFallBackPolicyCfg MO to set the CSFB policy for RRC_CONNECTED UEs. Param eter Name

Parameter ID

Data Source

Setting Notes

CSFB handov er policy Config uration

CSFallBack PolicyCfg.C sfbHoPolicy Cfg

Networ k plan (negoti ation not require d)

The following table describes the parameter that must be set in the CSFallBackPolicyCfg MO to set the CSFB policy for RRC_IDLE UEs. Param eter Name

Parameter ID

Data Source

Setting Notes

CSFB handov er policy Config uration for idle ue

CSFallBack PolicyCfg.Id leModeCsfb HoPolicyCfg

Networ k plan (negoti ation not require d)

8.6.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.6.5.3 Using MML Commands Using MML Commands The configurations in this section are examples, and configurations on the live network can differ from the examples. Scenario 1: The UTRAN and GERAN cover the same area and provide contiguous coverage. Step 1 Run the MOD CELLALGOSWITCH command with the UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch) and GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) options of the Handover Allowed Switch parameter selected. Issue 02 (2016-04-20)

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NOTE

This function is also controlled by the UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch) and GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) options of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that the eNodeB-level parameter be turned off and the cell-level parameter be used.

Step 2 Run the MOD CSFALLBACKBLINDHOCFG command with the Highest priority InterRat, Second priority InterRat, CSFB Highest priority InterRat for Idle UE, and CSFB Second priority InterRat for Idle UE parameters to UTRAN, GERAN, GERAN, and UTRAN, respectively. Step 3 Run the MOD CSFAllBACKPOLICYCFG command with the PS_HO option of the CSFB handover policy Configuration parameter and the REDIRECTION option of the CSFB handover policy Configuration for idle ue parameter selected. ----End Scenario 2: The UTRAN and GERAN cover the same area, and the GERAN provides contiguous coverage but the UTRAN does not. In this scenario, the eNodeB may not receive measurement reports after delivering UTRAN measurement configurations. When the CSFB protection timer expires, the UE is redirected to the GERAN. Step 1 The feature activation procedure is as follows: Run the MOD GERANNCELL command with the blind handover priority specified for the neighboring GERAN cell. Step 2 To enable UTRAN CSFB steering through cell-level commands, perform the following operations: l

Run the MOD CELLALGOSWITCH command with the UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch) and GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) options of the Handover Allowed Switch parameter selected. NOTE

Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter cleared.

Step 3 Run the MOD CSFALLBACKBLINDHOCFG command with parameters set as follows based on the network conditions and policies: Set the Highest priority InterRat parameter to UTRAN. Set the Second priority InterRat parameter to GERAN. Set the CSFB Highest priority InterRat for Idle UE parameter to UTRAN. Set the CSFB Second priority InterRat for Idle UE parameter to GERAN. Step 4 Run the MOD CSFALLBACKPOLICYCFG command with the REDIRECTION option of the CSFB handover policy Configuration parameter selected. ----End Issue 02 (2016-04-20)

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MML Command Examples Scenario 1: The UTRAN and GERAN cover the same area and provide contiguous coverage. MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch =UtranCsfbSteeringSwitch-1&GeranCsfbSteeringSwitch-1; MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN,IdleCsfbHighestPri=GERAN,IdleCsfb SecondPri=UTRAN; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-1, IdleModeCsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;

Scenario 2: The UTRAN and GERAN cover the same area, and the GERAN provides contiguous coverage but the UTRAN does not. MOD GERANNCELL: LocalCellId=1, Mcc="460", Mnc="20", Lac=12, GeranCellId=16,BlindHoPriority=32; MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch = UtranCsfbSwitch-1&GeranCsfbSwitch-1, HoAllowedSwitch =UtranCsfbSteeringSwitch-1&GeranCsfbSteeringSwitch-1; MOD CELLHOPARACFG: LocalCellId=0,HoModeSwitch=BlindHoSwitch-0; MOD CSFALLBACKBLINDHOCFG:CnOperatorId=0,InterRatHighestPri=UTRAN,InterRatSecondPri=GER AN,IdleCsfbHighestPri=UTRAN,IdleCsfbSecondPri=GERAN; MOD CSFALLBACKPOLICYCFG:CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0,IdleModeCsfbHoP olicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;

8.6.6 Activation Observation The signaling procedure is the same as that for CSFB to UTRAN. After CS Fallback Steering to UTRAN is used, check whether it works as expected. The activation observation procedure for CSFB steering to UTRAN is as follows: 1.

Check that the UE supports redirection-based CSFB and handover-based CSFB.

Set CSFB policies for RRC_IDLE UEs and RRC_CONNECTED UEs to redirection and handover, respectively.

Enable the UE to initiate a voice call in idle mode and in connected mode.

Observe the counters L.CSFB.E2W, L.RRCRedirection.E2W.CSFB, and L.IRATHO.E2W.CSFB.ExecAttOut. If the values of the counters increase by 2, 1, and 1, respectively, CSFB steering to UTRAN has been activated.

If TDLOFD-001089 CS Fallback Steering to GERAN has also been activated, the activation observation procedure is as follows: 1.

Check that the UE supports CSFB to GERAN and CSFB to UTRAN.

Set GERAN as the highest-priority RAT for CSFB triggered for RRC_IDLE UEs and UTRAN as the highest-priority RAT for CSFB triggered for RRC_CONNECTED UEs.

Enable the UE to initiate a voice call in idle mode and in connected mode.

Observe the counters L.CSFB.E2W and L.CSFB.E2G. If both the values increase by 1, both CSFB steering to UTRAN and CSFB steering to GERAN have been activated.

8.6.7 Deactivation Table 8-24 describes the parameters for deactivating this feature. Issue 02 (2016-04-20)

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Table 8-24 Parameters for deactivating CSFB steering to UTRAN MO

Parameter Group

Setting Notes

CellAlgoSwitch

HoAllowedSwitch

Set UtranCsfbSteeringSwitch of the HoAlgoSwitch parameter to 0.

This feature can be deactivated using the CME or MML commands.

8.6.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.6.7.2 Using MML Commands Using MML Commands Run the MOD CELLALGOSWITCH command with the UtranCsfbSteeringSwitch option of the Handover Allowed Switch parameter cleared.

MML Command Examples MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch =UtranCsfbSteeringSwitch-0;

8.6.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.8 Performance Monitoring. You can observe delivered frequencies and fallback RATs based on network logs.

8.6.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization.

8.7 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering This section provides engineering guidelines for TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering.

8.7.1 When to Use E-UTRAN to UTRAN CS/PS Steering Use this feature when the following conditions are met: l

TDLOFD-001033 CS Fallback to UTRAN and TDLOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN have been enabled.

The operator owns multiple UTRAN frequencies and wants to divert CS or PS services to specific UTRAN frequencies based on the network plan and loads.

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8.7.2 Required Information 1.

Collect information about whether TDLOFD-001033 CS Fallback to UTRAN and TDLOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN have been activated.

Collect the following information about the UEs that support UMTS and LTE on the live network: Supported frequency bands Whether the UEs support redirection from EUTRAN to UTRAN Whether the UEs support PS handover from E-UTRAN to UTRAN Whether the UEs support UTRAN measurements This information is used to configure neighboring UTRAN cells and to determine whether to perform CSFB based on handover or redirection. For details, see Inter-RAT Mobility Management in Connected Mode.

Collect the operating frequencies and frequency policies of the E-UTRAN and UTRAN. The frequency policies for UTRAN and E-UTRAN must be the same. For example, if F1 is the preferred frequency for voice services on UTRAN, the same configuration is recommended for E-UTRAN.

Collect the configurations and versions of E-UTRAN and UTRAN equipment to check whether CSFB is supported.

8.7.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-25. Table 8-25 License information for E-UTRAN to UTRAN CS/PS Steering Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD-0 01078

E-UTRAN to UTRAN CS/PS Steering

LT1SEU CSPS01

E-UTRAN to UTRAN CS/PS Steering

eNode B

per RRC Connected User

NOTE

This feature requires LOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN or LOFD-001033 CS Fallback to UTRAN.

8.7.4 Precautions None Issue 02 (2016-04-20)

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8.7.5 Data Preparation and Feature Activation 8.7.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data The required data is the same as that for LOFD-001033 CS Fallback to UTRAN. For details, see 8.1.5.1 Data Preparation.

Scenario-specific Data The following table describes the parameter that must be set in the CellAlgoSwitch MO to enable E-UTRAN to UTRAN CS/PS Steering.

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Parameter Name

Parameter ID

Data Source

Setting Notes

Frequency Layer Switch

CellAlgoSwitch.Fre qLayerSwitch

Network plan (negotiation not required)

When CSFB to UTRAN and PS inter-RAT mobility between E-UTRAN and UTRAN have been configured, set this parameter as follows: l Select the UtranFreqLaye rMeasSwitch(Ut ranFreqLayerM easSwitch) option to enable measurementbased handover for E-UTRAN to UTRAN CS/PS Steering. l Select the UtranFreqLaye rBlindSwitch(Ut ranFreqLayerBl indSwitch) option to enable blind handover for E-UTRAN to UTRAN CS/PS Steering.

The following table describes the parameter that must be set in the UtranNFreq MO to set the CS service priority for a UTRAN frequency. Paramet er Name

Parameter ID

Data Source

Setting Notes

CS service priority

UtranNFreq.CsPriorit y

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter specifies the CS service priority for the UTRAN frequency.

8.7.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

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8.7.5.3 Using MML Commands Using MML Commands The prerequisite is that CSFB to UTRAN has been activated. l

Scenario 1: Blind E-UTRAN to UTRAN CS/PS steering

Step 1 Run the MOD CELLALGOSWITCH command with the UtranFreqLayerBlindSwitch(UtranFreqLayerBlindSwitch) option of the Frequency Layer Switch parameter selected. NOTE

This function is also controlled by the UtranFreqLayerBlindSwitch option of the ENodeBAlgoSwitch.FreqLayerSwtich parameter. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that the eNodeB-level parameter be turned off and the cell-level parameter be used.

Step 2 Run the MOD UTRANNFREQ command with the CS service priority parameter set to Priority_16(Priority 16). ----End l

Scenario 2: Measurement-based E-UTRAN to UTRAN CS/PS steering

Step 1 Run the MOD CELLALGOSWITCH command with the UtranFreqLayerMeasSwitch(UtranFreqLayerMeasSwitch) option of the Frequency Layer Switch parameter selected. NOTE

This function is also controlled by the UtranFreqLayerMeasSwitch option of the ENodeBAlgoSwitch.FreqLayerSwtich parameter. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that the eNodeB-level parameter be turned off and the cell-level parameter be used.

Step 2 Run the MOD UTRANNFREQ command with the CS service priority parameter set to Priority_16(Priority 16). ----End

MML Command Examples l

Scenario 1: Blind E-UTRAN to UTRAN CS/PS steering

MOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerBlindSwitch-1; MOD UTRANNFREQ: LocalCellId=0,UtranDlArfcn=10800,CsPriority=Priority_16;

Scenario 2: Measurement-based E-UTRAN to UTRAN CS/PS steering

MMOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerMeasSwitch-1; MOD UTRANNFREQ: LocalCellId=0,UtranDlArfcn=10800,CsPriority=Priority_16;

8.7.6 Activation Observation The signaling procedure is the same as that for CSFB to UTRAN. After E-UTRAN to UTRAN CS/PS Steering is used, check whether it works as expected. Issue 02 (2016-04-20)

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The activation observation procedure for E-UTRAN to UTRAN CS/PS Steering is as follows: 1.

Verify that the UE supports CSFB and multiple UTRAN frequencies are available.

Enable measurement-based and blind handover for E-UTRAN to UTRAN CS/PS Steering. Set the highest PS service priority for UTRAN frequency F1 and the highest CS service priority for UTRAN frequency F2.

Have the UE camp on an LTE cell and initiate a voice call in the cell. The expected result is that the UE falls back to a UTRAN cell on F2.

Have the UE camp on the LTE cell and initiate PS services. Move the UE to the LTE cell edge. The expected result is that the UE is handed over to a UTRAN cell on F1.

8.7.7 Deactivation Table 8-26 describes the parameters for deactivating this feature. Table 8-26 Parameters for E-UTRAN to UTRAN CS/PS Steering MO

Parameter Group

Setting Notes

CellAlgoSwitch

FreqLayerSwitch

Clear the following options: l UtranFreqLayerMeasSwitch l UtranFreqLayerBlindSwitch

This feature can be deactivated using the CME or MML commands.

8.7.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.7.7.2 Using MML Commands Using MML Commands l

Deactivating blind E-UTRAN to UTRAN CS/PS steering Run the MOD CELLALGOSWITCH command with the UtranFreqLayerBlindSwitch(UtranFreqLayerBlindSwitch) option of the Frequency Layer Switch parameter cleared.

Deactivating measurement-based E-UTRAN to UTRAN CS/PS steering Run the MOD CELLALGOSWITCH command with the UtranFreqLayerMeasSwitch(UtranFreqLayerMeasSwitch) option of the Frequency Layer Switch parameter cleared.

MML Command Examples l

Deactivating blind E-UTRAN to UTRAN CS/PS steering

MOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerBlindSwitch-0;

Deactivating measurement-based E-UTRAN to UTRAN CS/PS steering

MOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerMeasSwitch-0;

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8.7.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.8 Performance Monitoring. You can observe delivered frequencies based on network logs.

8.7.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization.

8.8 TDLOFD-001034 CS Fallback to GERAN This section provides engineering guidelines for TDLOFD-001034 CS Fallback to GERAN.

8.8.1 When to Use CS Fallback to GERAN Use this feature in the initial phase of LTE network deployment when the following conditions are met: l

The operator owns a mature GERAN network.

The LTE network does not provide VoLTE services, or UEs in the LTE network do not support VoLTE services.

For policies on whether to use PS handover or PS redirection for CSFB, see Inter-RAT Mobility Management in Connected Mode. If GERAN and E-UTRAN cells cover the same area, or the GERAN cell provides better coverage than the E-UTRAN cell, use CSFB based on blind handover to decrease the CSFB delay.

8.8.2 Required Information l

Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN and GERAN cells. Information about coverage areas includes engineering parameters of sites (such as latitude and longitude), TX power of cell reference signals, and neighbor relationship configurations.

Collect the versions and configurations of the NEs in the E-UTRAN, GERAN, and core networks, and ensure that they all support CSFB. Table 8-27 describes the requirements of CSFB to GERAN for the core networks.

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Table 8-27 Requirements of CSFB to GERAN for core networks NE

Requirement

MME

Supports: l SGs interface to the MSC l LAI selection based on the TAI of the serving cell l MSC-initiated paging l PLMN selection and reselection l Combined EPS/IMSI attach, combined EPS/IMSI detach, and combined TAU/LAU l Routing of CS signaling messages l SMS over SGs

MSC

Supports: l Combined EPS/IMSI attach l SMS over SGs l Paging message forwarding over the SGs interface

SGSN

Does not activate ISR during the combined RAU/LAU procedure initiated by the UE.

Collect the following information about the UEs that support GSM and LTE on the live network: –

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to GERAN

–

Whether the UEs support PS handover from E-UTRAN to GERAN

–

Whether the UEs support GERAN measurements This information is used to configure neighboring GERAN cells and to determine whether to perform CSFB based on handover or redirection. For details, see InterRAT Mobility Management in Connected Mode.

8.8.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-28. Issue 02 (2016-04-20)

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Table 8-28 License information for CSFB to GERAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD001034

CS Fallback to GERAN

LT1ST0C FBG00

CS Fallback to GERAN

eNodeB

per RRC Connected User

NOTE

If the GERAN network uses Huawei equipment, activate the license for GBFD-511313 CSFB and turn on the switch specified by the GCELLSOFT.SUPPORTCSFB parameter. This licence is used for scenarios with LAU after CSFB to GERAN.

8.8.4 Precautions None

8.8.5 Data Preparation and Feature Activation 8.8.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data Before configuring CSFB to GERAN, collect the data related to neighbor relationships with GERAN cells. This section provides only the information about MOs related to neighboring GERAN cells. For more information about how to collect data for the parameters in these MOs, see Inter-RAT Mobility Management in Connected Mode. 1.

GeranNfreqGroup: used to configure a group of neighboring GERAN frequencies.

GeranNfreqGroupArfcn: used to configure a neighboring BCCH frequency in a GERAN carrier frequency group.

GeranExternalCell: used to configure external GERAN cells. The GeranExternalCell.Rac parameter must be set.

GeranExternalCellPlmn: used to configure additional PLMN IDs for each shared external GERAN cell. This MO is required only if the BTS that serves the external GERAN cell works in RAN sharing with common carriers mode and multiple operators share the external GERAN cell.

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GeranNcell: used to configure the neighbor relationship with a GERAN cell. If a neighboring GERAN cell supports blind handovers according to the network plan, the blind-handover priority of the cell must be specified by the GeranNcell.BlindHoPriority parameter.

Scenario-specific Data The following table describes the parameters that must be set in the ENodeBAlgoSwitch and CellAlgoSwitch MOs to set the handover mode and handover algorithm switches for CSFB to GERAN. Paramete r Name

Parameter ID

Data Source

Setting Notes

Handover Mode switch

ENodeBAl goSwitch. HoModeS witch

Network plan (negotiation not required)

Set this parameter based on the network plan.

Handover Allowed Switch

CellAlgoS witch.HoA llowedSwit ch

Network plan (negotiation not required)

To activate CSFB to GERAN, select the GeranCsfbSwitch(GeranCsfbSwitch) option.

To activate PS handovers, select the GeranPsHoSwitch(GeranPsHoSwitch) option. To activate CCO, select the GeranCcoSwitch(GeranCcoSwitch) option. To activate NACC, select the GeranNaccSwitch(GeranNaccSwitch) option. If none of the preceding options is selected, redirection will be used for CSFB to GERAN.

The following table describes the parameters that must be set in the ENodeBAlgoSwitch and CellHoParaCfg MOs to set eNodeB- and cell-level blind handover switches.

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Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handove r Mode switch

ENodeB AlgoSwi tch.Ho ModeSw itch

Network plan (negotiation not required)

Handove r Mode switch

CellHo ParaCf g.HoMo deSwitc h

Network plan (negotiation not required)

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The following table describes the parameters that must be set in the CellAlgoSwitch and CSFallBackHo MOs to set the switch for adaptive blind handover for CSFB and the A1 threshold for adaptive blind handover for CSFB. Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handove r Allowed Switch

CellAlg oSwitch .HoAllo wedSwit ch

Network plan (negotiation not required)

When GSM and LTE cells are co-sited with the same coverage, you can enable CsfbAdaptiveBlindHoSwitch. The eNodeB selects a measurement or blind handover to GSM based on the event A1 report submitted by a UE.

CSFB Adaptive Blind Ho A1 RSRP Trigger Threshol d

CSFall BackHo .BlindH oA1Thd Rsrp

Network plan (negotiation not required)

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB.

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Paramete r Name

Parameter ID

Data Source

Setting Notes

CN Operator ID

CSFallBackB lindHoCfg.Cn OperatorId

Network plan (negotiati on not required)

Set this parameter based on the network plan. This parameter specifies the ID of the operator whose RAT blind-handover priorities are to be set.

Highest priority InterRat

CSFallBackB lindHoCfg.Int erRatHighest Pri

Network plan (negotiati on not required)

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Paramete r Name

Parameter ID

Data Source

Setting Notes

Second priority InterRat

CSFallBackB lindHoCfg.Int erRatSecondP ri

Network plan (negotiati on not required)

Set this parameter based on the network plan. This parameter is set to GERAN by default and specifies the second-highest-priority RAT to be considered in blind handovers for CSFB. If the highest-priority RAT has been set to GERAN, the second-highest-priority RAT cannot be set to GERAN. Ensure that this parameter is set to a different value from the CSFallBackBlindHoCfg.InterRatHighestPri and CSFallBackBlindHoCfg.InterRatLowestPri parameters.

Lowest priority InterRat

CSFallBackB lindHoCfg.Int erRatLowestP ri

Network plan (negotiati on not required)

GERAN LCS capability

CSFallBackB lindHoCfg.Ge ranLcsCap

Network plan (negotiati on not required)

Set this parameter based on the network plan. This parameter specifies the LCS capability of the GERAN.

The following table describes the parameters that must be set in the CellOpHoCfg MO to set cell-level blind-handover priorities of different RATs for CSFB.

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Para meter Name

Parameter ID

Data Source

Setting Notes

CN Operat or ID

CellOpHoCf g.CnOperato rId

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter identifies the operator whose RAT blindhandover priorities are to be set.

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Para meter Name

Parameter ID

Data Source

Setting Notes

Local cell ID

CellOpHoCf g.LocalCellI d

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter identifies the cell whose RAT blindhandover priorities are to be set.

Highe st priorit y InterR at

CellOpHoCf g.InterRatHi ghestPri

Networ k plan (negoti ation not require d)

Secon d priorit y InterR at

CellOpHoCf g.InterRatSe condPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to GERAN by default and specifies the second-highest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CellOpHoCfg.InterRatHighestPri and CellOpHoCfg.InterRatLowestPri parameters.

Lowes t priorit y InterR at

CellOpHoCf g.InterRatLo westPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to CDMA2000 by default and specifies the lowest-priority RAT to be considered in blind handovers for CSFB. Ensure that this parameter is set to a different value from the CellOpHoCfg.InterRatHighestPri and CellOpHoCfg.InterRatSecondPri parameters.

The following table describes the parameter that must be set in the CSFallBackHo MO to set the CSFB protection timer.

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Paramete r Name

Parameter ID

Data Source

Setting Notes

CSFB Protection Timer

CSFallBack Ho.CsfbPro tectionTime r

Network plan (negotiation not required)

Set this parameter based on the network plan. The default value 4 applies to a GSM+UMTS+LTE network. The default value is also recommended for a GSM +LTE network. If this parameter is set too large, the CSFB delay increases in abnormal CSFB scenarios. If this parameter is set too small, normal measurement or handover procedures may be interrupted.

The following table describes the parameter that must be set in the GlobalProcSwitch MO to control redirection-based CSFB optimization for UEs in idle mode. Para meter Name

Parameter ID

Data Source

Setting Notes

Protoc ol Messa ge Optim ization Switch

GlobalProcSwi tch.ProtocolMs gOptSwitch

Network plan (negotiatio n not required)

To shorten the CSFB delay by skipping an RRC connection reconfiguration procedure during blind redirection for CSFB, select the IdleCsfbRedirectOptSwitch option of this parameter.

The following table describes the parameter that must be set in the GlobalProcSwitch MO to set the policy for handling the conflicts between handover and CSFB procedures.

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Paramete r Name

Parameter ID

Data Source

Setting Notes

Handover Process Control Switch

GlobalProcSwitch.H oProcCtrlSwitch

Network plan (negotiation not required)

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The following table describes the parameter that must be set in the CellAlgoSwitch MO to enable the function of deleting inter-frequency measurements when CSFB starts GERAN measurement. Paramete r Name

Parame ter ID

Data Source

Setting Notes

Measurem ent Optimizati on Algorithm Switch

CellAlg oSwitch .MeasO ptAlgoS witch

Network plan (negotiation not required)

Select the CSFB_MEAS_DEL_INTERFREQ_SW option if you need to enable the function of deleting inter-frequency measurements when CSFB starts GERAN measurement. If this option is cleared, the eNodeB does not delete inter-frequency measurements when CSFB starts GERAN measurement.

8.8.5.2 Using the CME l

Single/Batch Configuration This feature can be activated for a single eNodeB or a batch of eNodeBs on the CME. For detailed operations, see CME-based Feature Configuration.

8.8.5.3 Using MML Commands Using MML Commands l

Basic scenario 1: CSFB to GERAN using blind redirection

CSFB to GERAN using blind redirection works regardless of whether neighboring GERAN cells are configured. l

If you want to configure a neighboring GERAN cell, you must configure the GeranNFreq and GeranNCell MOs. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode.

If you do not want to configure a neighboring GERAN cell, you must configure the GeranRanShare or GeranExternalCell MO. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode.

Step 1 Run the following eNodeB- and cell-level commands to enable the blind handover function for CSFB to GERAN: 1.

Run the MOD ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch) option of the Handover Mode switch parameter selected.

Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter selected.

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Step 2 Run the MOD CELLALGOSWITCH command with the GeranCsfbSwitch(GeranCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

This function is also controlled by the GeranCsfbSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

Step 3 Run the MOD CSFALLBACKPOLICYCFG command with the CCO_HO and PS_HO options of the CSFB handover policy Configuration parameter cleared and the REDIRECTION option of the same parameter selected. Step 4 (Optional) If you require GERAN to have the highest priority for CSFB, run the following eNodeB- and cell-level commands: 1.

Run the MOD CSFALLBACKBLINDHOCFG command with the Highest priority InterRat and Second priority InterRat parameters set to GERAN and UTRAN, respectively.

Run the MOD CELLOPHOCFG command with the Highest priority InterRat and Second priority InterRat parameters set to GERAN and UTRAN, respectively.

Step 5 (Optional) If a neighboring GERAN cell is configured, run the MOD GERANNCELL command with the Blind handover priority parameter set to the highest priority (32). Step 6 (Optional) If no neighboring GERAN cell is configured, run the ADD GeranNfreqGroup command with the Frequency Priority for Connected Mode parameter set to the highest priority (8). Step 7 (Optional) Run the MOD GLOBALPROCSWITCH command with the IdleCsfbRedirectOptSwitch option of the Protocol Message Optimization Switch parameter selected. ----End l

Basic scenario 2: CSFB to GERAN using blind CCO with NACC

Step 1 Add neighboring GERAN frequencies and neighbor relationships with GERAN cells. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode. Step 2 Run the MOD CELLALGOSWITCH command with the GeranCsfbSwitch(GeranCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

Step 3 Run the MOD ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch), GeranNaccSwitch(GeranNaccSwitch), and GeranCcoSwitch(GeranCcoSwitch) options of the Handover Mode switch parameter, and Issue 02 (2016-04-20)

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the GERAN_RIM_SWITCH(GERAN RIM Switch) option of the RIM switch parameter selected. Step 4 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter selected. Step 5 Run the MOD CSFALLBACKPOLICYCFG command with the PS_HO and CCO_HO options of the CSFB handover policy Configuration parameter cleared and selected, respectively. Step 6 (Optional) If you require GERAN to have the highest priority for CSFB, run the MOD CSFALLBACKBLINDHOCFG command with the Highest priority InterRat parameter set to GERAN and the Second priority InterRat parameter set to UTRAN. Step 7 Run the MOD GERANNCELL command with the Blind handover priority parameter set to 32. ----End l

Basic scenario 3: CSFB to GERAN using blind handovers

Step 3 Run the MOD ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch) and GeranPsHoSwitch(GeranPsHoSwitch) options of the Handover Mode switch parameter selected. Step 4 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter selected. Step 5 (Optional) If the optional feature TDLOFD-001089 CS Fallback Steering to GERAN is enabled, run the MOD CSFALLBACKPOLICYCFG command with the PS_HO option of the CSFB handover policy Configuration parameter selected. Step 6 (Optional) If you require GERAN to have the highest priority for CSFB, run the MOD CSFALLBACKBLINDHOCFG command with the Highest priority InterRat parameter set to GERAN and the Second priority InterRat parameter set to UTRAN. Step 7 Run the MOD GERANNCELL command with the Blind handover priority parameter set to 32. ----End l

Basic scenario 4: CSFB to GERAN using measurement-based redirection

Step 1 Add neighboring GERAN frequencies and neighbor relationships with GERAN cells. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode. Issue 02 (2016-04-20)

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Step 2 Run the MOD CELLALGOSWITCH command with the GeranCsfbSwitch(GeranCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

Basic scenario 5: CSFB to GERAN using measurement-based handovers (recommended)

Step 3 Run the MOD ENODEBALGOSWITCH command with the GeranPsHoSwitch(GeranPsHoSwitch) option of the Handover Mode switch parameter selected. Step 4 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter deselected for the cells to be measured. Step 5 (Optional) If the optional feature TDLOFD-001089 CS Fallback Steering to GERAN is enabled, run the MOD CSFALLBACKPOLICYCFG command with the PS_HO option of the CSFB handover policy Configuration parameter selected. Step 6 Run the MOD CELLALGOSWITCH command with the CSFB_MEAS_DEL_INTERFREQ_SW option of the Measurement Optimization Algorithm Switch parameter selected. ----End Issue 02 (2016-04-20)

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Basic scenario 6: CSFB to GERAN using measurement-based CCO with NACC (recommended)

Step 3 Run the MOD ENODEBALGOSWITCH command with the GeranNaccSwitch(GeranNaccSwitch) and GeranCcoSwitch(GeranCcoSwitch) options of the Handover Mode switch parameter, and the GERAN_RIM_SWITCH(GERAN RIM Switch) option of the RIM switch parameter selected. Step 4 Run the MOD S1INTERFACE command with the MME Release parameter set to Release_R9(Release 9). Step 5 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of the Handover Mode switch parameter deselected for the cells to be measured. Step 6 Run the MOD CSFALLBACKPOLICYCFG command with the PS_HO and CCO_HO options of the CSFB handover policy Configuration parameter cleared and selected, respectively. Step 7 Run the MOD CELLALGOSWITCH command with the CSFB_MEAS_DEL_INTERFREQ_SW option of the Measurement Optimization Algorithm Switch parameter selected. ----End Enhanced scenario 1: Policy setting for handling the conflicts between handover and CSFB procedures To enable the eNodeB to process the CSFB procedure first, run the following command after the commands in a basic scenario are executed: Step 1 Run the MOD GLOBALPROCSWITCH command with the CsfbFlowFirstSwitch option of the Handover Process Control Switch parameter selected. ----End

MML Command Examples l

Basic scenario 1: CSFB to GERAN using blind redirection (configured with neighboring GERAN cells)

MOD MOD MOD MOD MOD

CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1; ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1; CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1; CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0; CSFALLBACKBLINDHOCFG: CnOperatorId=0,

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InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN; ADD CELLOPHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN; MOD GERANNCELL: LocalCellId=0, Mcc="460", Mnc="20", Lac=12, GeranCellId=15,BlindHoPriority=32; MOD GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1;

Basic scenario 1: CSFB to GERAN using blind redirection (configured with no neighboring GERAN cell)

MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1; MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1; MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0; MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN; MOD CELLBLINDHOPARACFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN; ADD CELLOPHOCFG: LocalCellId=0, CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN; ADD GeranNfreqGroup: LocalCellId=0, BcchGroupId=0, StratingArfcn=0, ConnFreqPriority=8; ADD GERANNFREQGROUPARFCN: LocalCellId=0, BcchGroupId=0,GeranArfcn=0; MOD GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1;

Basic scenario 2: CSFB to GERAN using blind CCO with NACC

MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1; MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1&GeranNaccSwitch-1&GeranCcoSwitch-1,RimSwitch=GERAN_RI M_SWITCH-1; MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-0; MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN; MOD GERANNCELL: LocalCellId=0, Mcc="460", Mnc="20", Lac=12, GeranCellId=15,BlindHoPriority=32;

Basic scenario 3: CSFB to GERAN using blind handovers

MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1; MOD ENODEBALGOSWITCH: HoModeSwitch=GeranPsHoSwitch-1&BlindHoSwitch-1; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1; MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1; MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN; MOD GERANNCELL: LocalCellId=0, Mcc="460", Mnc="20", Lac=12, GeranCellId=15,BlindHoPriority=32;

Basic scenario 4: CSFB to GERAN using measurement-based redirection

MOD MOD MOD MOD

CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1; CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0; CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0; CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;

Basic scenario 5: CSFB to GERAN using measurement-based handovers

MOD MOD MOD MOD MOD

CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1; ENODEBALGOSWITCH: HoModeSwitch=GeranPsHoSwitch-1; CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0; CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1; CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;

Basic scenario 6: CSFB to GERAN using measurement-based CCO with NACC

MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1; MOD ENODEBALGOSWITCH: HoModeSwitch=GeranNaccSwitch-1&GeranCcoSwitch-1,RimSwitch=GERAN_RIM_SWITCH-1; MOD S1INTERFACE: S1InterfaceId=2,S1CpBearerId=1,CnOperatorId=0,MmeRelease=Release_R9; MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-0; MOD CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;

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Enhanced scenario 1: Policy setting for handling the conflicts between handover and CSFB procedures To enable the eNodeB to process the CSFB procedure first, run the following command after the commands in a basic scenario are executed: MOD GLOBALPROCSWITCH:HoProcCtrlSwitch= CsfbFlowFirstSwitch-1;

8.8.6 Activation Observation Signaling Observation The activation observation procedure is as follows: 1.

Enable a UE to camp on an E-UTRAN cell and make a voice call.

Enable the UE to camp on an E-UTRAN cell and receive a voice call.

You can observe the signaling procedures for CSFB to GERAN, which is similar to that for CSFB to UTRAN described in section Figure 8-9. NOTE

In the following figures, the UE on the left side and the UE on the right side are the same UE. The signaling on the GERAN side is for reference only. The procedure for mobile-terminated calls is similar to the procedure for mobile-originated calls except that the procedure for mobile-terminated calls includes paging.

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Figure 8-9 Redirection-based CSFB to GERAN for a mobile-originated call

The signaling procedure for PS handover-based CSFB to GERAN is different from the signaling procedure for redirection-based CSFB to GERAN. The difference is as follows: In PS handover-based CSFB to GERAN, the eNodeB performs a PS handover procedure rather than an RRC connection release procedure after the UE reports measurement results to the eNodeB. For details about the signaling procedure of PS handover-based CSFB to GERAN, see 8.1.6 Activation Observation. In the signaling procedure of PS handover-based CSFB to GERAN, the CSFB indication flag is true and the CSFB target is GERAN in the MobilityFromEUTRACommand message. In the signaling procedure for PS handover-based CSFB to GERAN, the cs-FallbackIndicator IE is TRUE and the CSFB target is GERAN in the MobilityFromEUTRACommand message. Figure 8-10 shows the signaling procedure for CCO/NACC-based CFSB to GERAN for a mobile-originated call. In the CSFB, handover preparation is absent. The MobilityFromEUTRACommand message carries the CCO/NACC information and the CSFB target is GERAN.

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Figure 8-10 CCO/NACC-based CSFB to GERAN for a mobile-originated call

Counter Observation Table 8-29 lists the performance counters for observing functions related to CSFB to GERAN. Table 8-29 Performance counters for observing CSFB to GERAN

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Function

Counter ID

Counter Name

Description

CSFB to GERAN

152672832 4

L.CSFB.E2G

Number of times CSFB to GERAN is performed

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Function

Counter ID

Counter Name

Description

CSFB to GERAN triggered for emergency calls

152672871 0

L.CSFB.E2G.Emergenc y

Number of times CSFB to GERAN is triggered for emergency calls

8.8.7 Deactivation Table 8-30 describes the parameters for deactivating this feature. Table 8-30 Parameters for deactivating CSFB to GERAN MO

Parameter Group

Setting Notes

CellAlgoSwitch

HoAllowedSwitch

To deactivate CSFB to GERAN, set GeranCsfbSwitch of the HoAlgoSwitch parameter to 0.

This feature can be deactivated using the CME or MML commands.

8.8.7.1 Using MML Commands Using MML Commands Run the MOD CELLALGOSWITCH command with the GeranCsfbSwitch(GeranCsfbSwitch) option of the Handover Algo switch parameter cleared.

MML Command Examples MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-0;

8.8.8 Performance Monitoring CSFB is an end-to-end service. The performance counters on the LTE side can only indicate the success rate of the CSFB procedure on the LTE side, and. they cannot indicate the success rate of the CSFB procedure on the target side. Therefore, the performance counters on the LTE side cannot directly show user experience of the CSFB procedure. It is recommended that you perform drive tests and use the performance counters on the UE side to indicate the actual user experience of the CSFB procedure. Related counters are listed in Table 8-31.

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Table 8-31 Counters related to the execution of CSFB by the eNodeB Counter ID

Counter Name

Description

1526728321

L.CSFB.PrepAtt

Number of CSFB indicators received by the eNodeB

1526728322

L.CSFB.PrepSucc

Number of successful CSFB responses from the eNodeB

Table 8-32 lists the counter related to CSFB to GERAN. Table 8-32 Counter related to CSFB to GERAN Counter ID

Counter Name

Description

1526728324

L.CSFB.E2G

Number of procedures for CSFB to GERAN

Table 8-33 lists the counters that indicate whether CSFB is performed through redirection or handover. Table 8-33 Counters related to CSFB through redirection or handover Counter ID

Counter Name

Description

1526728498

L.RRCRedirectio n.E2G.CSFB

Number of CSFB-based redirections from EUTRAN to GERAN

1526728507

L.IRATHO.E2G. CSFB.PrepAttOu t

Number of CSFB-based inter-RAT handover preparation attempts from E-UTRAN to GERAN

You can check whether CCO with NACC or CCO without NACC is used as the CSFB mechanism by viewing the counters listed in Table 8-34. Table 8-34 Counters related to using CCO with NACC or CCO without NACC

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Counter ID

Counter Name

Description

1526729505

L.CCOwithNAC C.E2G.CSFB.Exe cAttOut

Number of CSFB-based CCO with NACC executions from E-UTRAN to GERAN

1526729506

L.CCOwithNAC C.E2G.CSFB.Exe cSuccOut

Number of successful CSFB-based CCOs with NACC from E-UTRAN to GERAN

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Counter ID

Counter Name

Description

1526729507

L.CCOwithoutN ACC.E2G.CSFB. ExecAttOut

Number of CSFB-based CCO without NACC executions from E-UTRAN to GERAN

The CCO success rate can be calculated in the following ways: l

L.CCOwithNACC.E2G.CSFB.ExecSuccOut/ L.CCOwithNACC.E2G.CSFB.ExecAttOut

L.CCOwithoutNACC.E2G.CSFB.ExecSuccOut/ L.CCOwithoutNACC.E2G.CSFB.ExecAttOut

After the CSFB protection timer expires, the eNodeB may perform a blind redirection to enter the protection procedure. Table 8-35 lists the related counter. A larger value of this counter indicates a longer average UE access delay during CSFB. Table 8-35 Counter related to the number of times that the eNodeB enters the protection procedure for CSFB Counter ID

Counter Name

Description

1526729516

L.RRCRedirectio n.E2G.CSFB.Tim eOut

Number of CSFB-based blind redirections from E-UTRAN to GERAN caused by CSFB protection timer expiration

Table 8-36 lists the counters related to CSFB for emergency calls. Table 8-36 Counters related to CSFB for emergency calls Counter ID

Counter Name

Description

1526729513

L.IRATHO.E2G. CSFB.ExecAttOu t.Emergency

Number of CSFB-based handover execution attempts to GERAN triggered for emergency calls

1526729514

L.IRATHO.E2G. CSFB.ExecSuccO ut.Emergency

Number of successful CSFB-based handover executions to GERAN triggered for emergency calls

CSFB handover success rate for emergency calls = L.IRATHO.E2G.CSFB.ExecSuccOut.Emergency/ L.IRATHO.E2G.CSFB.ExecAttOut.Emergency

8.8.9 Parameter Optimization The blind-handover-related parameter optimization procedure for CSFB to GERAN is the same as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization. Issue 02 (2016-04-20)

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The following table lists event-B1-related parameters for CSFB to GERAN in the CSFallBackHo MO. Paramet er Name

Parameter ID

Data Source

Setting Notes

Local cell ID

CSFallBac kHo.Local CellId

Network plan (negotiatio n not required)

Set this parameter based on the network plan.

CSFB GERAN EventB1 Trigger Threshold

CSFallBac kHo.CsfbH oGeranB1 Thd

Network plan (negotiatio n not required)

Set this parameter based on the network plan. This parameter specifies the RSSI threshold for event B1 in CSFB to GERAN. Event B1 is triggered when the measured RSSI of a GERAN cell reaches the value of this parameter and all other conditions are also met.

CSFB Geran EventB1 Time To Trig

CSFallBac kHo.CsfbH oGeranTim eToTrig

Network plan (negotiatio n not required)

Set this parameter based on the network plan. This parameter specifies the time-to-trigger for event B1 in CSFB to GERAN. When CSFB to GERAN is required, set this parameter, which is used by UEs as one of the conditions for triggering event B1. When a UE detects that the signal quality in at least one GERAN cell meets the entering condition, it does not immediately send a measurement report to the eNodeB. Instead, the UE sends a measurement report only when the signal quality has been meeting the entering condition throughout a period defined by this parameter. This parameter helps decrease the number of occasionally triggered event reports, the average number of handovers, and the number of incorrect handovers, preventing unnecessary handovers.

8.9 RIM Procedure from E-UTRAN to GERAN 8.9.1 When to Use RIM Procedure from E-UTRAN to GERAN It is recommended that the RIM procedure be performed through the Huawei-proprietary eCoordinator when the following conditions are met: l

Both the eNodeB and the RNC/BSC are provided by Huawei and are connected to the same eCoordinator.

The core network that the eNodeB and the RNC/BSC are connected to does not support the RIM procedure or is not enabled with the RIM procedure.

To perform the RIM procedure through the eCoordinator, set ENodeBAlgoSwitch.RimOnEcoSwitch to ON(On). Issue 02 (2016-04-20)

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In other conditions, it is recommended that the RIM procedure be performed through the core network. In this case, set ENodeBAlgoSwitch.RimOnEcoSwitch to OFF(Off).

8.9.2 Required Information Check whether the BSC, MME, and SGSN support the RIM procedure, and whether an eCoordinator has been deployed.

8.9.3 Requirements Operating Environment If the RIM procedure is performed through the core network, the core-network equipment must support this feature: l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

The BSC, MME, and SGSN must support the RIM procedures. If one of the NEs does not support, the RIM procedures fail. NOTE

In a multioperator core network (MOCN) scenario, the eNodeB preferentially selects the link for the primary operator when sending an RIM request. If the RIM procedure fails, the eNodeB no longer attempts to send the RIM request on other links.

License The operator has purchased and activated the license for the feature listed in Table 8-37. Table 8-37 License information for CSFB to GERAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD001034

CSFB to GERAN

LT1ST0C FBG00

CS Fallback to GERAN

eNodeB

per RRC Connected User

8.9.4 Precautions None

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8.9.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data The required data is the same as that for TDLOFD-001033 CS Fallback to UTRAN. For details, see 8.1.5.1 Data Preparation. GeranExternalCell: used to configure external GERAN cells. The GeranExternalCell.Rac parameter must be set.

Scenario-specific Data The following table describes the parameter that must be set in the ENodeBAlgoSwitch MO to configure the RIM procedure. Parameter Name

Parameter ID

Data Source

Setting Notes

Support RIM by eCoordinator Switch

ENodeBAlg oSwitch.Rim OnEcoSwitc h

Network plan (negotiatio n not required)

8.9.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.9.5.3 Using MML Commands Using MML Commands l

Performing the RIM procedure through the core network Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to OFF(Off).

Performing the RIM procedure through the eCoordinator Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to ON(On).

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MML Command Examples l

Performing the RIM procedure through the core network MOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;

Performing the RIM procedure through the eCoordinator MOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;

8.9.6 Activation Observation Counter Observation No matter whether the RIM procedure is performed through the core network or the eCoordinator, performance counters listed in Table 8-38 can be used to observe whether the RIM procedure has taken effect. Table 8-38 Counters related to the RIM procedure between E-UTRAN and GERAN Counter ID

Counter Name

Description

1526729661

L.RIM.SI.E2G.Req

Number of times the eNodeB sends a system information request to a GERAN

1526729662

L.RIM.SI.E2G.Resp

Number of times the eNodeB receives a system information response from a GERAN

1526729663

L.RIM.SI.E2G.Update

Number of times the eNodeB receives a system information update from a GERAN

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If the BSC sends the DIRECT INFORMATION TRANSFER message containing the RANINFORMATION IE over the Gb interface, you can infer that the BSC can notify the eNodeB with the cell state change through the RIM procedure. ----End If the RIM procedure is performed through the eCoordinator, trace signaling messages as follows: Step 1 Start an Se interface tracing task on the eNodeB LMT. Check whether the ENB DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION-REQUEST IE is sent over the Se interface. If the message is sent, you can infer that the eNodeB has sent the RIM request successfully. Step 2 Start an Sg interface tracing task on the BSC LMT. If after receiving the ECO DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION-REQUEST IE, the BSC sends the BSC DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION IE to the eCoordinator, you can infer that the BSC can response to the RIM request normally. Step 3 Change the state of the GSM cell. If the BSC sends the BSC DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION IE over the Sg interface, you can infer that the BSC can notify the eNodeB with the cell state change through the RIM procedure. ----End

8.9.7 Deactivation Table 8-39 describes the parameters for deactivating this feature. Table 8-39 Parameters for the RIM procedure MO

Parameter Group

Setting Notes

ENodeBAlgoSwitch

RimOnEcoSwitch

Set this parameter to OFF(Off).

This feature can be deactivated using the CME or MML commands.

8.9.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.9.7.2 Using MML Commands Using MML Commands l

Performing the RIM procedure through the core network Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to ON(On).

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Performing the RIM procedure through the eCoordinator Run the MOD ENODEBALGOSWITCH command with the Support RIM by eCoordinator Switch parameter set to OFF(Off).

MML Command Examples l

Performing the RIM procedure through the core network MOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;

Performing the RIM procedure through the eCoordinator MOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;

8.9.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.8 Performance Monitoring.

8.9.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.9 Parameter Optimization.

8.10 TDLOFD-001053 Flash CSFB to GERAN This section provides engineering guidelines for TDLOFD-001053 Flash CSFB to GERAN.

8.10.1 When to Use Flash CS Fallback to GERAN When TDLOFD-001034 CS Fallback to GERAN has been enabled, use TDLOFD-001053 Flash CS Fallback to GERAN if all the following conditions are met:The E-UTRAN and GERAN support the RIM with SIB procedure.3GPP Release 9 UEs are used on the live network.The core networks support the RIM procedure. For policies on whether to use PS handover or PS redirection for CSFB, see Inter-RAT Mobility Management in Connected Mode. If GERAN and E-UTRAN cells cover the same area, or the GERAN cell provides better coverage than the E-UTRAN cell, use CSFB based on blind handover to decrease the CSFB delay.

8.10.2 Required Information l

Collect information about whether LOFD-001034 CS Fallback to GERAN has been activated.

Collect the versions and configurations of the NEs in the E-UTRAN, GERAN, and core networks, and ensure that they all support CSFB and the RIM procedure. Table 8-40 describes the requirements of flash CSFB to GERAN for the core networks. For details about processing in Huawei GSM equipment, see Interoperability Between GSM and LTE in GBSS Feature Documentation.

Collect the following information about the UEs that support GSM and LTE on the live network:

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–

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to GERAN

–

Whether the UEs support PS handover from E-UTRAN to GERAN

–

Whether the UEs support GERAN measurements

–

Whether the UEs comply with 3GPP Release 9 specifications

This information is used to configure neighboring GERAN cells and to determine whether to perform CSFB based on handover or redirection. For details, see Inter-RAT Mobility Management in Connected Mode.

Table 8-40 Requirements of flash CSFB to GERAN for core networks NE

Requirement

MME

Supports CSFB and RIM procedures

SGSN

Supports CSFB and RIM procedures

8.10.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the licenses for the features listed in Table 8-41. Table 8-41 License information for flash CSFB to GERAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD-0 01053

Ultra-Flash CSFB to GERAN(T DD)

LT1SFCS FGE01

Flash CS Fallback to GERAN

eNodeB

per RRC Connected User

NOTE

If the GERAN uses Huawei devices, evolved network assisted cell change (eNACC) between EUTRAN and GERAN for CSFB needs to be enabled on the GERAN. For detailed operations, see section "eNACC from EUTRAN to GERAN" in Interoperability Between GSM and LTE Feature Parameter Description.

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8.10.4 Precautions None

8.10.5 Data Preparation and Feature Activation 8.10.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data Before configuring CSFB to GERAN, collect the data related to neighbor relationships with GERAN cells. This section provides only the information about MOs related to neighboring GERAN cells and key parameters in these MOs. For more information about how to collect data for the parameters in these MOs, see Inter-RAT Mobility Management in Connected Mode Feature Parameter Description. 1.

GeranNfreqGroup: used to configure a group of neighboring GERAN frequencies.

GeranNfreqGroupArfcn: used to configure a neighboring BCCH frequency in a GERAN carrier frequency group.

GeranExternalCell: used to configure external GERAN cells. The GeranExternalCell.Rac parameter must be set.

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Parameter Name

Parameter ID

Data Source

Setting Notes

Handover Mode switch

ENodeBAlg oSwitch.Ho ModeSwitch

Network plan (negotiati on not required)

Set this parameter based on the network plan.

Handover Allowed Switch

CellAlgoSw itch.HoAllo wedSwitch

Network plan (negotiati on not required)

To activate CSFB to GERAN, select the GeranCsfbSwitch(GeranCsfbSwitch) and GeranFlashCsfbSwitch(GeranFlashCsfbSwitch) options.

RIM switch

ENodeBAlg oSwitch.Ri mSwitch

Network plan (negotiati on not required)

GERAN_RIM_SWITCH(GERAN RIM Switch) of this parameter specifies whether to enable or disable the RIM procedure that requests event-driven multiple reports from GERAN cells. If this switch is turned on, the eNodeB can send RAN-INFORMATION-REQUEST/ Multiple Report PDUs to GERAN cells to request event-driven multiple reports. If this switch is turned off, the eNodeB cannot send RAN-INFORMATION-REQUEST/ Multiple Report PDUs to GERAN cells. If this switch is turned off and GeranFlashCsfbSwitch(GeranFlashCsfbSwitch) of ENodeBAlgoSwitch.HoAlgoSwitch is turned on, the eNodeB sends RANINFORMATION-REQUEST/Single Report PDUs to GERAN cells to request single reports. If the GERAN cells support RANINFORMATION-REQUEST/Multiple Report PDUs, you are advised to select the GERAN_RIM_SWITCH(GERAN RIM Switch) option.

The following table describes the parameters that must be set in the ENodeBAlgoSwitch and CellHoParaCfg MOs to set eNodeB- and cell-level blind handover switches.

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Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handove r Mode switch

ENodeB AlgoSwi tch.Ho ModeSw itch

Network plan (negotiation not required)

Handove r Mode switch

CellHo ParaCf g.HoMo deSwitc h

Network plan (negotiation not required)

The following table describes the parameter that must be set in the S1Interface MO to set the compliance protocol release of the MME. Paramete r Name

Parameter ID

Data Source

Setting Notes

MME Release

S1Interface .MmeRelea se

Network plan (negotiation not required)

To activate RIM procedures in Multiple Report mode, set the parameter to Release_R9(Release 9).

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set the blind-handover priorities of different RATs for CSFB.

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Parameter Name

Parameter ID

Data Source

Setting Notes

CN Operator ID

CSFallBackBlindHoCfg.CnOperato rId

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter specifies the ID of the operator whose RAT blind-handover priorities are to be set.

Highest priority InterRat

CSFallBackBlindHoCfg.InterRatHi ghestPri

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter is set to UTRAN by default and specifies the highest-priority RAT to be considered in blind handovers for CSFB. For flash CSFB to GERAN, set this parameter to GERAN.

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Parameter Name

Parameter ID

Data Source

Setting Notes

Second priority InterRat

CSFallBackBlindHoCfg.InterRatSe condPri

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter is set to GERAN by default and specifies the second-highest-priority RAT to be considered in blind handovers for CSFB. If the highest-priority RAT has been set to GERAN, the secondhighest-priority RAT cannot be set to GERAN. Ensure that this parameter is set to a different value from the CSFallBackBlindHoCfg.InterRatHighestPri and CSFallBackBlindHoCfg.InterRatLowestPri parameters.

Lowest priority InterRat

CSFallBackBlindHoCfg.InterRatLo westPri

Network plan (negotiation not required)

GERAN LCS capability

CSFallBackBlindHoCfg.GeranLcsC ap

Network plan (negotiation not required)

Set this parameter based on the network plan. This parameter specifies the LCS capability of the GERAN.

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Parameter Name

Parameter ID

Data Source

Setting Notes

Max Geran cell num in redirection

InterRatHo Comm.CellI nfoMaxGera nCellNum

Network plan (negotiati on not required)

Max Geran cell num in CSFB EMC redirection

InterRatHo Comm.Gera nCellNumF orEmcRedir ect

Network plan (negotiati on not required)

To use flash CSFB for emergency blind redirection, change the parameter value from the default value 0 to a non-zero value.

8.10.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.10.5.3 Using MML Commands Using MML Commands The prerequisite is that CSFB to GERAN has been activated. In addition to the steps in the CSFB to GERAN using blind redirections or CSFB to GERAN using measurement-based redirections scenario, perform the following steps: Step 1 Run the MOD CELLALGOSWITCH command with the GeranFlashCsfbSwitch(GeranFlashCsfbSwitch) option of the Handover Allowed Switch parameter selected. NOTE

In addition, this function is controlled by the GeranFlashCsfbSwitch option of the ENodeBAlgoSwitch.HoAlgoSwitch parameter. The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared. The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to use the cell-level parameter.

Step 2 Run the MOD ENODEBALGOSWITCH command with the GERAN_RIM_SWITCH(GERAN RIM Switch) option of the RIM switch parameter selected. Step 3 Run the MOD S1INTERFACE command with the MME Release parameter set to Release_R9(Release 9). Step 4 (Optional) Run the MOD INTERRATHOCOMM command with the Max Geran cell num in redirection parameter set (its default value is 8). Issue 02 (2016-04-20)

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Step 5 (Optional) Run the MOD INTERRATHOCOMM command with the Max Geran cell num in CSFB EMC redirection parameter set, for example, to 3. ----End

MML Command Examples MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranFlashCsfbSwitch-1; MOD ENODEBALGOSWITCH: RimSwitch=GERAN_RIM_SWITCH-1; MOD S1INTERFACE: S1InterfaceId=2,S1CpBearerId=1,CnOperatorId=0,MmeRelease=Release_R9; MOD INTERRATHOCOMM: CellInfoMaxGeranCellNum=8; MOD INTERRATHOCOMM: GeranCellNumForEmcRedirect=3;

8.10.6 Activation Observation Signaling Observation Enable a UE to camp on an E-UTRAN cell and originate a voice call. If so that the UE falls back to a GERAN cell and completes the call continues, and the RRC Connection Release message traced in on the Uu interface tracing carries the information of the neighboring GERAN cell. In this case, flash CSFB to GERAN has been activated successfully. In this case, flash CSFB to GERAN has been activated successfully. The procedure of flash CS fallback to GERAN on the E-UTRAN side is the same as the procedure of redirectionbased CS fallback to GERAN. For details, see 8.1.6 Activation Observation. The difference is that the RRC Connection Release message carries the system information of the neighboring GERAN cell. For details, see Figure 8-11. Figure 8-11 The RRC Connection Release message during flash CSFB to GERAN

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MML Command Observation Check the status of the RIM procedure towards neighboring GERAN cells by running the DSP GERANRIMINFO command. If the ID of a neighboring GERAN cell is displayed in the command output, the eNodeB has obtained the system information of this neighboring GERAN cell.

Counter Observation The counter listed in Table 8-42 can be viewed to check whether the feature has taken effect. Table 8-42 Performance counters for observing flash CSFB to GERAN Functions

Counter ID

Counter Name

Description

Flash CS Fallback to GERAN

1526728706

L.FlashCSFB.E2G

Number of procedures for flash CSFB to GERAN

RIM during flash CSFB to GERAN

1526729661

L.RIM.SI.E2G.Req

Number of times the eNodeB sends a system information request to a GERAN

1526729662

L.RIM.SI.E2G.Res p

Number of times the eNodeB receives a system information response from a GERAN

1526729663

L.RIM.SI.E2G.Up date

Number of times the eNodeB receives a system information update from a GERAN

8.10.7 Deactivation Table 8-43 describes the parameters for deactivating this feature. Table 8-43 Parameters for deactivating flash CSFB to GERAN MO

Parameter Group

Setting Notes

CellAlgoSwitch

HoAllowedSwitch

Set GeranFlashCsfbSwitch of the HoAlgoSwitch parameter to 0.

This feature can be deactivated using the CME or MML commands.

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8.10.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.10.7.2 Using MML Commands Using MML Commands Run the MOD CELLALGOSWITCH command with the GeranFlashCsfbSwitch option of the Handover Allowed Switch parameter cleared.

MML Command Examples MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranFlashCsfbSwitch-0;

8.10.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.8 Performance Monitoring.

8.10.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.9 Parameter Optimization.

8.11 TDLOFD-081203 Ultra-Flash CSFB to GERAN This section provides engineering guidelines for TDLOFD-081203 Ultra-Flash CSFB to GERAN.

8.11.1 When to Use Ultra-Flash CSFB to GERAN Use this feature in the overlapping coverage of GSM and LTE networks when the following conditions are met: l

The TDLOFD-001034 CS Fallback to GERAN feature has been enabled.

The eNodeB, MME, and MSC are provided by Huawei.

A proportion of UEs support SRVCC from E-UTRAN to GERAN.

8.11.2 Required Information Before deploying this feature, ensure that: l

TD LOFD-001034 CS Fallback to GERAN has been enabled.

The eNodeB, MME, and MSC are provided by Huawei and they all support this feature.

There are UEs that support SRVCC from E-UTRAN to GERAN.

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8.11.3 Requirements Operating Environment This feature is a Huawei-proprietary feature and requires that the eNodeB, MME, and MSC be provided by Huawei and support this feature. This feature is used with MME11.0 and MSC11.0.

License The operator has purchased and activated the licenses for the features listed in Table 8-44. Table 8-44 License information for ultra-flash CSFB to GERAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD -081203

Ultra-Flash CSFB to GERAN

LT1SUFCF BG00

Ultra-Flash CSFB to GERAN

eNodeB

per RRC Connected User

8.11.4 Precautions This feature is a Huawei-proprietary feature and is not supported by devices provided by other vendors. In addition, this feature must first be activated on the BSC, MME, and MSC, and then be activated on the eNodeB. This is because this feature is triggered by the eNodeB and this avoids CSFB failures.

8.11.5 Data Preparation and Feature Activation 8.11.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data The required data is the same as that for TDLOFD-001034 CS Fallback to GERAN. For details, see 8.1.5.1 Data Preparation. Issue 02 (2016-04-20)

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Scenario-specific Data The following table describes the parameter that must be set in the ENodeBAlgoSwitch MO to set the eNodeB-level handover switch for ultra-flash CSFB to GERAN. Parameter Name

Parameter ID

Data Source

Setting Notes

Handover Algo switch

ENodeBAl goSwitch. HoAlgoSw itch

Network plan (negotiation not required)

Select the GeranUltraFlashCsfbSwitch(GeranUltraFlashCsfbSwitch) option.

The following table describes the parameter that must be set in the CellHoParaCfg MO to set the cell-level blind handover switch for ultra-flash CSFB to GERAN. Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handove r Mode switch

CellHo ParaCf g.HoMo deSwitc h

Network plan (negotiation not required)

To activate cell-level blind handovers, select the BlindHoSwitch(BlindHoSwitch) option. To activate blind handovers, you still need to activate eNodeB-level blind handovers.

The following table describes the parameter that must be set in the CellHoParaCfg MO to disable blind handover for UEs supporting ultra-flash CSFB after the blind handover function takes effect. Paramete r Name

Parame ter ID

Data Source

Setting Notes

Handover Mode switch

CellHo ParaCf g.HoMo deSwitc h

Network plan (negotiation not required)

The following table describes the parameter that must be set in the CellAlgoSwitch MO to enable the function of deleting inter-frequency measurements when CSFB starts GERAN measurement.

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Paramete r Name

Parame ter ID

Data Source

Setting Notes

Measurem ent Optimizati on Algorithm Switch

CellAlg oSwitch .MeasO ptAlgoS witch

Network plan (negotiation not required)

The following table describes the parameter that must be set in the GeranExternalCell MO to set the capability of external GERAN cells when some GERAN cells do not support ultraflash CSFB to GERAN. Paramet er Name

Parame ter ID

Data Source

Setting Notes

UltraFlash CSFB capabilit y indicator

GeranE xternal Cell.Ult raFlash CsfbInd

Network plan (negotiation required)

Clear the UltraFlashCsfbInd option for external GERAN cells that do not support ultra-flash CSFB to GERAN.

The following table describes the parameter that must be set in the CellDrxPara MO to set the DRX switch for measurements when UEs support DRX-based measurements. Paramet er Name

Parame ter ID

Data Source

Setting Notes

DRX switch for measure ments

CellDrx Para.Dr xForMe asSwitc h

Network plan (negotiation required)

When the network supports measurements and UEs support DRX measurements well, measurement delays are significantly reduced and the customer can tolerate the impact on services during measurements. To enable the DRX switch for measurements, set DrxForMeasSwitch to 1.

Long DRX Cycle for Measure ment

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CellDrx Para.Lo ngDrxC ycleFor Meas

Network plan (negotiation required)

This parameter specifies the length of the long DRX cycle specific to GERAN measurement.

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Paramet er Name

Parame ter ID

Data Source

Setting Notes

On Duration Timer for Measure ment

CellDrx Para.O nDurTi merFor Meas

Network plan (negotiation required)

This parameter specifies the length of the On Duration Timer specific to GERAN measurement.

DRX Inactivity Timer for Measure ment

CellDrx Para.Dr xInactTi merFor Meas

Network plan (negotiation required)

This parameter specifies the length of the DRX Inactivity Timer specific to GERAN measurement.

DRX Retransm ission Timer for Measure ment

CellDrx Para.Dr xReTxT imerFor Meas

Network plan (negotiation required)

This parameter specifies the length of the DRX Retransmission Timer specific to GERAN measurement.

Short DRX Switch for Measure ment

CellDrx Para.Sh ortDrxS wForMe as

Network plan (negotiation required)

This parameter specifies whether short-period DRX is enabled for GERAN measurements.

Short DRX Cycle for Measure ment

CellDrx Para.Sh ortDrxC ycleFor Meas

Network plan (negotiation required)

This parameter specifies the length of the short DRX cycle specific to GERAN measurement.

Short Cycle Timer for Measure ment

CellDrx Para.Sh ortCycle TimerF orMeas

Network plan (negotiation required)

This parameter specifies the length of the Short Cycle Timer specific to GERAN measurement.

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Paramet er Name

Parame ter ID

Data Source

Setting Notes

Ue Compati bility Switch

GlobalP rocSwit ch.UeC ompatS witch

Network plan (negotiation required)

8.11.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.11.5.3 Using MML Commands Using MML Commands l

Basic scenario

Step 1 Run MML commands to configure neighboring GERAN frequencies and GERAN cells. For details about parameter settings, see Inter-RAT Mobility Management in Connected Mode. Step 2 Run the MOD ENODEBALGOSWITCH command with the GeranUltraFlashCsfbSwitch(GeranUltraFlashCsfbSwitch) option of the Handover Algo switch parameter selected. Step 3 (Optional) Run the MOD GLOBALPROCSWITCH command with the IratMeasCfgTransSwitch option of the Protocol Message Optimization Switch parameter selected if you need to optimize "G2L Fast Return after Ultra-Flash CSFB to GERAN" based on the E-UTRA frequency capability supported by UEs. The eNodeB transfers E-UTRA frequency information supported by UEs to the BSC during SRVCC. Step 4 (Optional) Run the MOD GERANEXTERNALCELL command with the Ultra-Flash CSFB Capability Indication parameter set to BOOLEAN_FALSE if some external GERAN cells do not support Ultra-Flash CSFB to GERAN. Step 5 (Optional) Run the MOD CELLDRXPARA command with the DRX for Measurement Switch parameter set to ON(On) if UEs support DRX-based measurements. ----End l

(Optional) Perform the following operation if UE compatibility risks exist after ultraflash CSFB is activated.

Step 1 Run the MOD GLOBALPROCSWITCH command with the UltraFlashCsfbComOptSw(UltraFlashCsfbComOptSw) option of the UE Compatibility Switch parameter selected. ----End Issue 02 (2016-04-20)

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Step 1 Run the MOD CELLHOPARACFG command with the UFCsfbBlindHoDisSwitch option of the Handover Mode switch parameter selected. ----End l

(Optional) Perform the following operation if you need to enable the function of deleting inter-frequency measurements when CSFB starts GERAN measurement.

Step 1 Run the MOD CELLALGOSWITCH command with the CSFB_MEAS_DEL_INTERFREQ_SW option of the MeasOptAlgoSwitch parameter selected. ----End

MML Command Examples l

Basic scenario MOD ENODEBALGOSWITCH: HoAlgoSwitch= GeranUltraFlashCsfbSwitch-1; MOD GlobalProcSwitch: ProtocolMsgOptSwitch=IratMeasCfgTransSwitch-1; MOD GERANEXTERNALCELL: Mcc="302", Mnc="220", GeranCellId=2, Lac=12, UltraFlashCsfbInd=BOOLEAN_TRUE; MOD CELLDRXPARA: LocalCellId=0, DrxForMeasSwitch=1, LongDrxCycleForMeas=SF160, OnDurTimerForMeas=PSF2, DrxInactTimerForMeas=PSF2, DrxReTxTimerForMeas=PSF4, ShortDrxSwForMeas=1, ShortDrxCycleForMeas=SF20, ShortCycleTimerForMeas=1;

(Optional) Perform the following operation if UE compatibility risks exist after ultraflash CSFB is activated. MOD GLOBALPROCSWITCH: UeCompatSwitch= UltraFlashCsfbComOptSw-1;

(Optional) Perform the following operation if you need to enable the function of deleting inter-frequency measurements when CSFB starts GERAN measurement. MOD CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;

8.11.6 Activation Observation Signaling Observation To use signaling tracing to verify whether this feature has been activated, perform the following steps: 1.

As shown in the following figure, the HANDOVER REQUIRED message sent from the eNodeB to the MME over the S1 interface contains handover request cause values "csfallback-triggered" and "sRVCCHOIndication-cSonly (1)", indicating that an ultra-flash CSFB to GERAN is triggered successfully.

The UE falls back to a GERAN cell and completes the call.

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Figure 8-12 HANDOVER REQUIRED message

Counter Observation The counter listed in the following table can be monitored to check whether the feature has been activated. Table 8-45 Performance counters for ultra-flash CSFB to GERAN Counter ID

Counter Name

Description

1526733006

L.IRATHO.CSFB.S RVCC.E2G.PrepAt tOut

Number of SRVCC-based outgoing handover attempts from E-UTRAN to GERAN for ultraflash CSFB to GERAN

8.11.7 Deactivation Table 8-46 describes the parameters for deactivating this feature. Table 8-46 Parameter related to ultra-flash CSFB to GERAN MO

Parameter Group

Setting Notes

ENodeBAlgoSwitch

HoAlgoSwitch

To deactivate ultra-flash CSFB to GERAN, deselect the GeranUltraFlashCsfbSwitch option.

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8.11.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.11.7.2 Using MML Commands Using MML Commands Run the MOD ENODEBALGOSWITCH command with the GeranUltraFlashCsfbSwitch(GeranUltraFlashCsfbSwitch) option of the Handover Algo switch parameter deselected.

MML Command Examples MOD ENODEBALGOSWITCH: HoAlgoSwitch=GeranUltraFlashCsfbSwitch-0;

8.11.8 Performance Monitoring Table 8-47 lists the counters used to monitor the performance of ultra-flash CSFB to GERAN. Table 8-47 Counters related to ultra-flash CSFB to GERAN Counter ID

Counter Name

Description

1526733006

L.IRATHO.CSFB .SRVCC.E2G.Pre pAttOut

Number of SRVCC-based outgoing handover attempts from E-UTRAN to GERAN for ultra-flash CSFB to GERAN

1526733007

L.IRATHO.CSFB .SRVCC.E2G.Exe cAttOut

Number of SRVCC-based outgoing handover executions from E-UTRAN to GERAN for ultra-flash CSFB to GERAN

1526733008

L.IRATHO.CSFB .SRVCC.E2G.Exe cSuccOut

Number of successful SRVCC-based outgoing handovers from E-UTRAN to GERAN for ultra-flash CSFB to GERAN

1526733009

L.IRATHO.CSFB .SRVCC.E2G.M MEAbnormRsp

Number of abnormal responses from the MME during outgoing handovers from EUTRAN to GERAN for ultra-flash CSFB to GERAN

Execution success rate of handovers for ultra-flash CSFB to GERAN = (L.IRATHO.CSFB.SRVCC.E2G.ExecSuccOut L.IRATHO.CSFB.SRVCC.E2G.MMEAbnormRsp)/ L.IRATHO.CSFB.SRVCC.E2G.ExecAttOut

8.11.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.9 Parameter Optimization. Issue 02 (2016-04-20)

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8.12 TDLOFD-001069 CS Fallback with LAI to GERAN This section provides engineering guidelines for TDLOFD-001069 CS Fallback with LAI to GERAN.

8.12.1 When to Use CS Fallback with LAI to GERAN Use TDLOFD-001069 CS Fallback with LAI to GERAN when both of the following conditions are met: l

TDLOFD-001034 CS Fallback to GERAN has been enabled.

The E-UTRAN cell has neighboring GERAN cells that belong to different PLMNs and supports inter-PLMN handovers, or the E-UTRAN cell has neighboring GERAN cells that have different LACs.

If both TDLOFD-001033 CS Fallback to UTRAN and TDLOFD-001034 CS Fallback to GERAN have been enabled, you are advised to enable both TDLOFD-001069 CS Fallback with LAI to GERAN and TDLOFD-001068 CS Fallback with LAI to UTRAN.

8.12.2 Required Information l

Collect information about whether TDTDLOFD-001034 CS Fallback to GERAN has been activated.

Collect the versions and configurations of the NEs in the E-UTRAN, GERAN, and core networks, and ensure that they all support CSFB and the MME supports LAI delivery. Table 8-48 describes the requirements of CSFB with LAI to GERAN for the core networks. Table 8-48 Requirements of CSFB with LAI to GERAN for core networks NE

Requirement

MME

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Requirement

MSC

Supports: l Combined EPS/IMSI attach l SMS over SGs l Paging message forwarding over the SGs interface

SGSN

Does not activate ISR during the combined RAU/LAU procedure initiated by the UE.

Collect the following information about the UEs that support GSM and LTE on the live network: –

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to GERAN

–

Whether the UEs support PS handover from E-UTRAN to GERAN

–

8.12.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-49. Table 8-49 License information for CSFB with LAI to GERAN Feature ID

Feature Name

Mode l

License Control Item

Sales Unit

TDLOFD-0 01069

CS Fallback with LAI to GERAN

LT1S GCSL AI00

CS Fallback with LAI to GERAN

eNode B

per RRC Connected User

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8.12.5 Data Preparation and Feature Activation This feature is automatically activated when two conditions are met: The license for this feature has been purchased. CSFB to GERAN has been activated.

8.12.5.1 Data Preparation Data preparation for activating CSFB with LAI to GERAN is the same as that for activating CSFB to GERAN. For details, see 8.1.5.1 Data Preparation.

8.12.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.12.5.3 Using MML Commands For details, see 8.8.5.3 Using MML Commands.

8.12.6 Activation Observation The activation observation procedure is as follows: 1.

Configure two neighboring GERAN cells with different LAIs for an E-UTRAN cell, and enable the MME to include only one of the two LAIs in the instructions that will be delivered to the eNodeB.

Ensure that the signal strengths of the two GERAN cells both reach the threshold for event B1. You can query the threshold by running the LST INTERRATHOGERANGROUP command.

Enable a UE to camp on the E-UTRAN cell and make a voice call.

Enable the UE to camp on the E-UTRAN cell and receive a voice call.

You can observe the signaling procedure for CSFB with LAI to GERAN, which is similar to that for CSFB to GERAN described in 8.9.6 Activation Observation. The difference is that the Initial Context Setup Request or UE Context Mod Request message carries the LAI that the MME delivers to the eNodeB, as shown in the following figure: Figure 8-13 LAI signaling tracing

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8.12.7 Deactivation TDLOFD-001069 CS Fallback with LAI to GERAN is automatically deactivated when its license or CSFB to GERAN is deactivated. For details about how to deactivate CSFB to GERAN, see 8.8.7 Deactivation.

8.12.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.8 Performance Monitoring.

8.12.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.9 Parameter Optimization.

8.13 TDLOFD-001089 CS Fallback Steering to GERAN This section provides engineering guidelines for TDLOFD-001089 CS Fallback Steering to GERAN.

8.13.1 When to Use CS Fallback Steering to GERAN Use this feature to improve the network efficiency when the following conditions are met: l

TDLOFD-001034 CS Fallback to GERAN has been enabled.

An operator owns multiple GERAN frequencies and the operator has different handover policies for CS-only services and combined CS+PS services.

If the operator owns both UTRAN and GERAN, you can also activate TDLOFD-001088 CS Fallback Steering to UTRAN to improve the network efficiency.

8.13.2 Required Information 1.

Collect information about whether TDLOFD-001034 CS Fallback to GERAN has been activated.

Collect the following information about the UEs that support GSM and LTE on the live network: –

Supported frequency bands

–

Whether the UEs support redirection from E-UTRAN to GERAN

–

Whether the UEs support PS handover from E-UTRAN to GERAN

–

Whether the UEs support CCO from E-UTRAN to GERAN

–

Whether the UEs support GERAN measurements

This information is used to configure neighboring GERAN cells and to determine whether to perform CSFB based on handover, redirection, or CCO. For details, see InterRAT Mobility Management in Connected Mode Feature Parameter Description. 3.

Collect information about the frequencies and frequency policies of the GERAN. Frequency policies must be the same for GERAN and E-UTRAN.

If TDLOFD-001088 CS Fallback Steering to UTRAN is also to be activated, consider the UTRAN frequencies when making frequency policies.

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8.13.3 Requirements Operating Environment l

For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not for eRAN3.0, messages may not be parsed.

For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8. Check that software versions for the EPC are correct.

License The operator has purchased and activated the license for the feature listed in Table 8-50. Table 8-50 License information for CSFB steering to GERAN Feature ID

Feature Name

Model

License Control Item

Sales Unit

TDLOFD-0010 89

CS Fallback Steering to GERAN

LT1STCS FSG00

CS Fallback Steering to GERAN

eNode B

per RRC Connected User

8.13.4 Precautions None

8.13.5 Data Preparation and Feature Activation 8.13.5.1 Data Preparation This section describes the data that you need to collect for setting parameters. Required data is data that you must collect for all scenarios. Collect scenario-specific data when necessary for a specific feature deployment scenario. There are three types of data sources: l

Network plan (negotiation not required): parameter values planned and set by the operator

Network plan (negotiation required): parameter values planned by the operator and negotiated with the EPC or peer transmission equipment

User-defined: parameter values set by users

Required Data The required data is the same as that for CS Fallback to GERAN. For details, see 8.1.5.1 Data Preparation. Issue 02 (2016-04-20)

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Scenario-specific Data The following table describes the parameter that must be set in the CellAlgoSwitch MO to enable Handover Allowed Switch. Paramet er Name

Parame ter ID

Data Source

Setting Notes

Handover Allowed Switch

CellAlg oSwitch .HoAllo wedSwit ch

Network plan (negotiation not required)

Select the GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) option under this parameter.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set RAT priorities for CSFB triggered for RRC_CONNECTED UEs.

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Param eter Name

Parameter ID

Data Source

Setting Notes

CN Operat or ID

CSFallBack BlindHoCfg. CnOperatorI d

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter identifies the operator whose RAT blindhandover priorities are to be set.

Highes t priority InterRa t

CSFallBack BlindHoCfg. InterRatHig hestPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to UTRAN by default and specifies the highest-priority RAT to be considered in blind handovers for CSFB.

Second priority InterRa t

CSFallBack BlindHoCfg. InterRatSeco ndPri

Networ k plan (negoti ation not require d)

Lowest priority InterRa t

CSFallBack BlindHoCfg. InterRatLow estPri

Networ k plan (negoti ation not require d)

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Param eter Name

Parameter ID

Data Source

Setting Notes

GERA N LCS capabil ity

CSFallBack BlindHoCfg. GeranLcsCa p

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter specifies the LCS capability of the GERAN.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfg MO to set RAT priorities for CSFB triggered for RRC_IDLE UEs. Param eter Name

Parameter ID

Data Source

Setting Notes

CSFB Highes t priority InterRa t for Idle UE

CSFallBack BlindHoCfg. IdleCsfbHig hestPri

Networ k plan (negoti ation not require d)

Set this parameter based on the network plan. This parameter is set to UTRAN by default and specifies the highest-priority RAT to be considered in CSFB for UEs in idle mode.

CSFB Second priority InterRa t for Idle UE

CSFallBack BlindHoCfg. IdleCsfbSeco ndPri

Networ k plan (negoti ation not require d)

CSFB Lowest priority InterRa t for Idle UE

CSFallBack BlindHoCfg. IdleCsfbLow estPri

Networ k plan (negoti ation not require d)

The following table describes the parameter that must be set in the CSFallBackPolicyCfg MO to set the CSFB policy for RRC_CONNECTED UEs.

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Param eter Name

Parameter ID

Data Source

Setting Notes

CSFB handov er policy Config uration

CSFallBack PolicyCfg.C sfbHoPolicy Cfg

Networ k plan (negoti ation not require d)

The following table describes the parameter that must be set in the CSFallBackPolicyCfg MO to set the CSFB policy for RRC_IDLE UEs. Param eter Name

Parameter ID

Data Source

Setting Notes

CSFB handov er policy Config uration for idle ue

CSFallBack PolicyCfg.Id leModeCsfb HoPolicyCfg

Networ k plan (negoti ation not require d)

8.13.5.2 Using the CME For detailed operations, see CME-based Feature Configuration.

8.13.5.3 Using MML Commands Using MML Commands The configuration is just an example, and configurations on the live network can differ from this example. For MML command settings in scenarios where the UTRAN and GERAN cover the same area but only the GERAN provides contiguous coverage, see 8.6.5 Data Preparation and Feature Activation. The prerequisite is that CSFB to GERAN has been activated. Step 1 Run the MOD CELLALGOSWITCH command with the GeranCsfbSteeringSwitch option of the Handover Allowed Switch parameter selected.

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NOTE

MML Command Examples MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSteeringSwitch-1; MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN,IdleCsfbHighestPri=GERAN,IdleCsfb SecondPri=UTRAN; MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-1, IdleModeCsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;

8.13.6 Activation Observation The signaling procedure is the same as that for CSFB to GERAN. After CS Fallback Steering to GERAN is used, check whether it works as expected. The activation observation procedure for CSFB steering to GERAN is as follows: 1.

Check that the UE supports redirection-based CSFB and handover-based CSFB.

Set CSFB policies for RRC_IDLE UEs and RRC_CONNECTED UEs to redirection and handover, respectively.

Enable the UE to initiate a voice call in idle mode and in connected mode.

Observe the counters L.CSFB.E2G, L.RRCRedirection.E2G.CSFB, and L.IRATHO.E2G.CSFB.ExecAttOut. If the values of the counters increase by 2, 1, and 1, respectively, CSFB steering to GERAN has been activated.

If TDLOFD-001088 CS Fallback Steering to UTRAN has also been activated, the activation observation procedure is as follows: 1.

Check that the UE supports CSFB to GERAN and CSFB to UTRAN.

Set GERAN as the highest-priority RAT for CSFB triggered for RRC_IDLE UEs and UTRAN as the highest-priority RAT for CSFB triggered for RRC_CONNECTED UEs.

Enable the UE to initiate a voice call in idle mode and in connected mode.

Observe the counters L.CSFB.E2W and L.CSFB.E2G. If both the values increase by 1, both CSFB steering to UTRAN and CSFB steering to GERAN have been activated.

8.13.7 Deactivation Table 8-51 describes the parameters for deactivating this feature. Issue 02 (2016-04-20)

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Table 8-51 Parameters for deactivating CSFB steering to GERAN MO

Parameter Group

Setting Notes

CellAlgoSwitch

HoAllowedSwitch

Set GeranCsfbSteeringSwitch of the HoAlgoSwitch parameter to 0.

This feature can be deactivated using the CME or MML commands.

8.13.7.1 Using the CME For detailed operations, see CME-based Feature Configuration.

8.13.7.2 Using MML Commands Using MML Commands Run the MOD CELLALGOSWITCH command with the GeranCsfbSteeringSwitch option of the Handover Allowed Switch parameter cleared.

MML Command Examples MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSteeringSwitch-0;

8.13.8 Performance Monitoring The performance monitoring procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.8 Performance Monitoring.

8.13.9 Parameter Optimization The parameter optimization procedure for this feature is the same as that for CSFB to GERAN. For details, see 8.8.9 Parameter Optimization.

8.14 Troubleshooting 8.14.1 CSFB Calling Procedure Failure Fault Description A UE performs cell reselection to an inter-RAT neighboring cell directly after initiating a voice call in an E-UTRAN cell, and the S1 interface tracing result shows that CSFB is not triggered.

Fault Handling Step 1 Create an S1 interface tracing task, use the UE to camp on the E-UTRAN cell again, and check whether the value of the information element (IE) ePS-attach-type-value is "combinedattach" in the traced Attach Request message. Issue 02 (2016-04-20)

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If so, go to Step 2.

If not, replace the UE with one that supports combined EPS/IMSI attach, and try again.

Step 2 Check whether the traced Attach Accept message includes the IE cs-domain-not-available. l

If it does, go to Step 3.

If not, contact Huawei technical support.

Step 3 Contact the vendors of core network NEs to ensure the following: l

Attach procedures to the CS domain are allowed according to the subscription data on the HSS.

The core network supports CSFB.

The SGs interface is correctly configured.

----End

8.14.2 eNodeB Receiving No Measurement Report Fault Description An eNodeB delivers an RRC Connection Reconfiguration message for measurement control to a UE that has initiated a voice call in the LTE network, but the eNodeB does not receive a measurement report.

Fault Handling Step 1 Check whether the RRC Connection Reconfiguration message contains B1-related measurement configurations and whether the information about the inter-RAT systems in the configuration is correct. l

If it is, go to Step 2

If not, rectify the faults and try again.

Step 2 Check whether the coverage of the inter-RAT neighboring cell is satisfactory. If the coverage is unsatisfactory, adjust B1-related parameters or use CSFB based on blind handovers. For details about how to adjust B1-related parameters, see Inter-RAT Mobility Management in Connected Mode. ----End

8.14.3 CSFB Blind Handover Failure Fault Description Even when blind handovers are configured as the preferred choice according to the operator policies, instead of triggering a blind handover for CSFB, an eNodeB delivers an inter-RAT measurement configuration to a UE that has initiated a voice call.

Fault Handling Step 1 Run the LST ENODEBALGOSWITCH command and check the setting of BlindHoSwitch under the Handover Mode Switch parameter. If BlindHoSwitch is Off, run the MOD Issue 02 (2016-04-20)

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ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch) check box under the Handover Mode Switch parameter selected. Step 2 Run the LST CELLHOPARACFG command and check the setting of BlindHoSwitch under the Handover Mode Switch parameter. If BlindHoSwitch is Off, run the MOD CELLHOPARACFG command with the BlindHoSwitch(BlindHoSwitch) check box under the Handover Mode Switch parameter selected. In addition, check the CSFB mechanism and perform the following: l

If CSFB to UTRAN is required, go to Step 3.

If CSFB to GERAN is required, go to Step 4.

Step 3 Run the LST UTRANNCELL command and check whether Blind handover priority is 0 for a neighboring UTRAN cell that is supposed to accept incoming blind handovers. l

If Blind handover priority is 0, blind handovers to this cell are not allowed. In this case, run the MOD UTRANNCELL command with the Blind handover priority parameter set to a value other than 0.

If Blind handover priority is not 0, contact Huawei technical support.

Step 4 Run the LST GERANNCELL command and check whether Blind handover priority is 0 for a neighboring GERAN cell that is supposed to accept incoming blind handovers. l

If Blind handover priority is 0, blind handovers to this cell are not allowed. In this case, run the MOD GERANNCELL command with the Blind handover priority parameter set to a value other than 0.

If Blind handover priority is not 0, contact Huawei technical support.

----End

8.14.4 CSFB Handover Failure Fault Description During CSFB to UTRAN procedures with the handover policy set to PS HO, the handover preparation success rate is low.

Table 8-52 Counters related to the handover preparation success rate

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Counter ID

Counter Name

Description

1526728504

L.IRATHO.E2W.CSFB.Pre pAttOut

Number of CSFB-based inter-RAT handover preparation attempts from E-UTRAN to WCDMA network

1526728505

L.IRATHO.E2W.CSFB.Exe cAttOut

Number of CSFB-based inter-RAT handover execution attempts from EUTRAN to WCDMA network

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Fault Handling Here uses the CSFB to UTRAN as an example to describe the fault handling procedure. Similar counters are provided for CSFB to GERAN or to other systems. Step 1 View the counters listed in Table 8-53 to check the cause for the low handover preparation success rate. Table 8-53 Counters related to outgoing handover preparation failures Counter ID

Counter Name

Description

1526730076

L.IRATHO.E2W.CSFB.Pre p.FailOut.MME

Number of CSFB-based outgoing handover preparation failures from EUTRAN to WCDMA network because of the MME side causes

1526730077

L.IRATHO.E2W.CSFB.Pre p.FailOut.PrepFailure

Number of CSFB-based outgoing handover preparation failures from EUTRAN to WCDMA network because of the response of handover preparation failure from WCDMA network

1526730078

L.IRATHO.E2W.CSFB.Pre p.FailOut.NoReply

Number of CSFB-based outgoing handover preparation failures from EUTRAN to WCDMA network because of no response from WCDMA network

Step 2 Analyze the failure cause based on the values of the preceding counters for each NE. ----End

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Parameters

Table 9-1 Parameters MO

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellHoP araCfg

HoMode Switch

MOD CELLH OPARA CFG

LOFD-0 01022 / TDLOF D-00102 2

SRVCC to UTRAN

Meaning: Indicates the handover method switches based on which the eNodeB determines handover policies. BlindHoSwitch: This option specifies whether to enable blind handover for CSFB. Bind handover for CSFB is enabled only if this option is selected. A blind handover for CSFB can be triggered only if both this option and the BlindHoSwitch option of the HoModeSwitch parameter in the ENodeBAlgoSwitch MO are selected. UtranPsHoSwitch: PS handover to UTRAN is supported only if this option is selected. This option takes effect only if the eNodeB-level option UtranPsHoSwitch of the HoModeSwitch parameter in the ENodeBAlgoSwitch MO is deselected. UtranSrvccSwitch: SRVCC to UTRAN is supported only if this option is selected. This option takes effect only if the eNodeB-level option UtranSrvccSwitch of the HoModeSwitch parameter in the ENodeBAlgoSwitch MO is deselected. GeranSrvccSwitch: SRVCC to GERAN is supported only if this option is selected. This option takes effect only if the eNodeB-level option GeranSrvccSwitch of the HoModeSwitch parameter in the ENodeBAlgoSwitch MO is deselected. UtranRedirectSwitch: Redirection to UTRAN is supported only if this option is selected. This option takes effect only if the eNodeB-level option UtranRedirectSwitch of the HoModeSwitch parameter in the ENodeBAlgoSwitch MO is deselected. GeranRedirectSwitch: Redirection to GERAN is supported only if this option is selected. This option

LST CELLH OPARA CFG

LOFD-0 01023 / TDLOF D-00102 3 LOFD-0 01033 / TDLOF D-00103 3 LOFD-0 01034 / TDLOF D-00103 4 LOFD-0 01019 / TDLOF D-00101 9 LOFD-0 01020 / TDLOF D-00102 0

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SRVCC to GERAN CS Fallback to UTRAN CS Fallback to GERAN PS InterRAT Mobility between EUTRAN and UTRAN PS InterRAT Mobility between EUTRAN and GERAN

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Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

Description

TDLOF D-08122 3

UltraFlash CSFB to UTRAN

takes effect only if the eNodeB-level option GeranRedirectSwitch of the HoModeSwitch parameter in the ENodeBAlgoSwitch MO is deselected. UFCsfbBlindHoDisSwitch: If both this option and the BlindHoSwitch option of the same parameter are selected, a UE is handed over to a UTRAN or GERAN cell based on measurement results using ultra-flash CS fallback. If this option is deselected and the BlindHoSwitch option of the same parameter is selected, a UE can be blindly handed over to a UTRAN or GERAN cell using ultra-flash CS fallback. This option applies only to LTE TDD cells.

TDLOF D-08120 3

UltraFlash CSFB to GERAN

GUI Value Range: BlindHoSwitch(BlindHoSwitch), UtranPsHoSwitch(UtranPsHoSwitch), UtranSrvccSwitch(UtranSrvccSwitch), GeranSrvccSwitch(GeranSrvccSwitch), UtranRedirectSwitch(UtranRedirectSwitch), GeranRedirectSwitch(GeranRedirectSwitch), UFCsfbBlindHoDisSwitch(UFCsfbBlindHoDisSwitch) Unit: None Actual Value Range: BlindHoSwitch, UtranPsHoSwitch, UtranSrvccSwitch, GeranSrvccSwitch, UtranRedirectSwitch, GeranRedirectSwitch, UFCsfbBlindHoDisSwitch Default Value: BlindHoSwitch:Off, UtranPsHoSwitch:Off, UtranSrvccSwitch:Off, GeranSrvccSwitch:Off, UtranRedirectSwitch:Off, GeranRedirectSwitch:Off, UFCsfbBlindHoDisSwitch:Off

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Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellAlg oSwitch

MeasOp tAlgoSw itch

MOD CELLA LGOSW ITCH

LOFD-0 01023 / TDLOF D-00102 3

SRVCC to GERAN

Meaning:

LST CELLA LGOSW ITCH

LBFD-0 02018 / TDLBF D-00201 8 LOFD-0 01019 / TDLOF D-00101 9 LOFD-0 01020 / TDLOF D-00102 0 TDLOF D-00103 4 TDLOF D-08120 3

Mobility Manage ment PS InterRAT Mobility between EUTRAN and UTRAN PS InterRAT Mobility between EUTRAN and GERAN CS Fallback to GERAN UltraFlash CSFB to GERAN

Indicates whether to enable measurement-related optimization algorithms. GSM_MEAS_DEL_INTERFREQ_SW: Indicates whether to cancel inter-frequency measurements after a GSM measurement is triggered when the UE is performing VoIP services. If the UE is performing VoIP services and this option is selected, the eNodeB cancels all inter-frequency measurements when a GSM measurement is triggered. This reduces the GSM measurement reporting delay. If the UE is performing VoIP services and this option is deselected, the eNodeB does not cancel interfrequency measurements when the GSM measurement is triggered. MEAS_OBJ_PREEMPT_SW: Indicates whether to enable preemption when the number of measurement objects of a UE reaches the specified threshold. If this option is selected and the number of measurement objects of the UE reaches the specified threshold, preemption is enabled to ensure that measurements of algorithms with high priority can be delivered. If this option is deselected and the number of measurement objects of the UE reaches the specified threshold, preemption is disabled and the measurements of algorithms that are triggered later cannot be delivered. CSFB_MEAS_DEL_INTERFREQ_SW: Indicates whether to terminate inter-frequency measurements after a GSM frequency measurement starts for an EUTRAN-to-GERAN CS fallback process. If this option is selected, the eNodeB terminates all interfrequency measurements when a GSM frequency measurement is triggered during the CS fallback process, reducing the GSM frequency measurement reporting delay. If this option is deselected, the eNodeB does not terminate inter-frequency measurements when a GSM frequency measurement is triggered during the CSFB process. This parameter applies only to LTE TDD cells. GUI Value Range: GSM_MEAS_DEL_INTERFREQ_SW(Gsm Meas Del Interfreq Switch), MEAS_OBJ_PREEMPT_SW(Meas Obj Preempt Switch), CSFB_MEAS_DEL_INTERFREQ_SW(Csfb Meas Del Interfreq Switch) Unit: None

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Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

Actual Value Range: GSM_MEAS_DEL_INTERFREQ_SW, MEAS_OBJ_PREEMPT_SW, CSFB_MEAS_DEL_INTERFREQ_SW Default Value: GSM_MEAS_DEL_INTERFREQ_SW:Off, MEAS_OBJ_PREEMPT_SW:Off, CSFB_MEAS_DEL_INTERFREQ_SW:Off

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Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

GlobalP rocSwitc h

HoProc CtrlSwit ch

MOD GLOBA LPROC SWITC H

None

Meaning:

LST GLOBA LPROC SWITC H

Indicates whether to control the handover process. This parameter provides the following options: HoDataSendCtrlSwitch: If this option is selected, the eNodeB sends data packets to a handover-incoming UE after sending a random access response (RAR) in a non-contention-based random access procedure. If this option is deselected, the eNodeB sends data packets to the UE after receiving an Msg3 message in the non-contention-based random access procedure. ErabFlowFirstSwitch: This option specifies the policy for handling the conflicts between handover and bearer procedures. If this option is selected and a handover procedure conflicts with an E-RAB setup, modification, or deletion procedure, the eNodeB performs as follows: 1. If the handover is not for CSFB or SRVCC, the eNodeB processes the bearer procedure first. 2. Otherwise, the eNodeB processes the handover procedure first. If this option is deselected, the eNodeB processes the handover procedure first in the preceding scenario. CsfbFlowFirstSwitch: This option specifies the policy for handling the conflicts between handover and CSFB procedures. If this option is selected and the handover and CSFB procedures conflict, the eNodeB processes the CSFB procedure first. If this option is deselected in the preceding scenario, the eNodeB processes the handover procedure first. GUI Value Range: HoDataSendCtrlSwitch(HoDataSendCtrlSwitch), ErabFlowFirstSwitch(ErabFlowFirstSwitch), CsfbFlowFirstSwitch(CsfbFlowFirstSwitch) Unit: None Actual Value Range: HoDataSendCtrlSwitch, ErabFlowFirstSwitch, CsfbFlowFirstSwitch Default Value: HoDataSendCtrlSwitch:Off, ErabFlowFirstSwitch:Off, CsfbFlowFirstSwitch:Off

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Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellAlg oSwitch

HoAllo wedSwit ch

MOD CELLA LGOSW ITCH

LBFD-0 0201805 / TDLBF D-00201 805

Service Based Interfrequenc y Handov er

Meaning: Indicates whether to enable eNodeB-level handovers to be activated in the cell when related eNodeB-level handover switches are on. SrvBasedInterFreqHoSw: Indicates whether to enable service-based inter-frequency handover to be activated in the cell. Service-based inter-frequency handover is allowed to be activated in the cell only when this switch is on. GeranSepOpMobilitySwitch: Indicates whether to differentiate mobility policies for GERAN operators. When this switch is on, different network policies can be applied to different GERAN operators. Such policies include SRVCC and SI obtaining through RIM procedures. When this switch is off, different network policies cannot be applied to different GERAN operators. This option applies only to FDD cells. UtranCsfbSwitch: Indicates whether to enable CSFB for UTRAN. When this switch is on, CSFB to UTRAN is allowed. When this switch is off, the UTRAN CSFB algorithm is disabled. If eNodeBlevel UtranCsfbSwitch is on, local-cell-level parameter settings do not take effect. If eNodeB-level UtranCsfbSwitch is off, local-cell-level parameter settings take effect. GeranCsfbSwitch: Indicates whether to enable CSFB for GERAN. When this switch is on, CSFB to GERAN is allowed. When this switch is off, the GERAN CSFB algorithm is disabled. If eNodeB-level GeranCsfbSwitch is on, local-cell-level parameter settings do not take effect. If eNodeB-level GeranCsfbSwitch is off, local-cell-level parameter settings take effect. UtranFlashCsfbSwitch: This switch does not take effect if UtranCsfbSwitch is off. When the UtranFlashCsfbSwitch is on, flash CSFB to UTRAN is enabled, and UTRAN system information is carried during redirection. When the UtranFlashCsfbSwitch is off, flash CSFB to UTRAN is disabled. If eNodeB-level UtranFlashCsfbSwitch is on, local-cell-level parameter settings do not take effect. If eNodeB-level UtranFlashCsfbSwitch is off, local-cell-level parameter settings take effect. GeranFlashCsfbSwitch: This switch does not take effect if GeranCsfbSwitch is off. When the GeranFlashCsfbSwitch is on, flash CSFB to GERAN is enabled, and GERAN system information is carried during redirection. When the GeranFlashCsfbSwitch is off, flash CSFB to GERAN is disabled. If eNodeBlevel GeranFlashCsfbSwitch is on, local-cell-level parameter settings do not take effect. If eNodeB-level GeranFlashCsfbSwitch is off, local-cell-level

LST CELLA LGOSW ITCH

LOFD-1 11204 LOFD-0 01033/ TDLOF D-00103 3 LOFD-0 01034/ TDLOF D-00103 4 LOFD-0 01052/ TDLOF D-00105 2

Separate Mobility Policies to GERAN for Multi PLMN CS Fallback to UTRAN CS Fallback to GERAN

LOFD-0 01053/ TDLOF D-00105 3

Flash CS Fallback to UTRAN

LOFD-0 01088/ TDLOF D-00108 8

Flash CS Fallback to GERAN

LOFD-0 01089/ TDLOF D-00108 9

CS Fallback Steering to UTRAN CS Fallback Steering to GERAN

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Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

parameter settings take effect. CsfbAdaptiveBlindHoSwitch: This switch does not take effect if BlindHoSwitch is off. If both the BlindHoSwitch and UFCsfbBlindHoDisSwitch options are selected, the CsfbAdaptiveBlindHoSwitch option of the HoAlgoSwitch parameter does not take effect when a UE is handed over to a UTRAN or GERAN cell using ultra-flash CS fallback. When this switch is on, CSFB adaptive blind handover is enabled. In this situation, an optimal handover mode is used depending on UE position in the CSFB scenario. When this switch is off, CSFB adaptive blind handover is disabled. If eNodeB-level CsfbAdaptiveBlindHoSwitch is on, local-cell-level parameter settings do not take effect. If eNodeB-level CsfbAdaptiveBlindHoSwitch is off, local-cell-level parameter settings take effect. UtranCsfbSteeringSwitch: UTRAN CSFB steering is enabled when this switch is on. In this case, RRC_IDLE UEs can use separate configuration policies when triggering CSFB. UTRAN CSFB steering is disabled when this switch is off. If eNodeB-level UtranCsfbSteeringSwitch is on, localcell-level parameter settings do not take effect. If eNodeB-level UtranCsfbSteeringSwitch is off, localcell-level parameter settings take effect. GeranCsfbSteeringSwitch: GERAN CSFB steering is enabled when this switch is on. In this case, RRC_IDLE UEs can use separate configuration policies when triggering CSFB. GERAN CSFB steering is disabled when this switch is off. If eNodeB-level GeranCsfbSteeringSwitch is on, localcell-level parameter settings do not take effect. If eNodeB-level GeranCsfbSteeringSwitch is off, localcell-level parameter settings take effect. GUI Value Range: SrvBasedInterFreqHoSw(SrvBasedInterFreqHoSw), GeranSepOpMobilitySwitch(GeranSepOpMobilitySwitch), UtranCsfbSwitch(UtranCsfbSwitch), GeranCsfbSwitch(GeranCsfbSwitch), UtranFlashCsfbSwitch(UtranFlashCsfbSwitch), GeranFlashCsfbSwitch(GeranFlashCsfbSwitch), CsfbAdaptiveBlindHoSwitch(CsfbAdaptiveBlindHoSwitch), UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch), GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) Unit: None Actual Value Range: SrvBasedInterFreqHoSw, GeranSepOpMobilitySwitch, UtranCsfbSwitch, Issue 02 (2016-04-20)

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Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

GeranCsfbSwitch, UtranFlashCsfbSwitch, GeranFlashCsfbSwitch, CsfbAdaptiveBlindHoSwitch, UtranCsfbSteeringSwitch, GeranCsfbSteeringSwitch Default Value: SrvBasedInterFreqHoSw:On, GeranSepOpMobilitySwitch:Off, UtranCsfbSwitch:Off, GeranCsfbSwitch:Off, UtranFlashCsfbSwitch:Off, GeranFlashCsfbSwitch:Off, CsfbAdaptiveBlindHoSwitch:Off, UtranCsfbSteeringSwitch:Off, GeranCsfbSteeringSwitch:Off

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9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellAlg oSwitch

FreqLay erSwitch

MOD CELLA LGOSW ITCH

LOFD-0 01087

SRVCC Flexible Steering to UTRAN

Meaning:

LST CELLA LGOSW ITCH

LOFD-0 01078 / TDLOF D-00107 8 LOFD-0 01022/ TDLOF D-00102 2 LOFD-0 01033/ TDLOF D-00103 3 LOFD-0 01052/ TDLOF D-00105 2 LOFD-0 01088/ TDLOF D-00108 8

EUTRAN to UTRAN CS/PS Steering SRVCC to UTRAN CS Fallback to UTRAN Flash CS Fallback to UTRAN CS Fallback Steering to UTRAN

This parameter includes the following three options: UtranFreqLayerMeasSwitch, UtranFreqLayerBlindSwitch, and UtranSrvccSteeringSwitch. The setting of the option UtranSrvccSteeringSwitch takes effect only when the UtranFreqLayerMeasSwitch option is selected. If the UtranFreqLayerMeasSwitch option is selected, UTRAN frequency steering takes effect at measurement configuration delivery for coveragebased handovers to UTRAN or CSFB to UTRAN. This cell-specific parameter setting takes effect only when the eNodeB-specific UtranFreqLayerMeasSwitch option is deselected. If the UtranFreqLayerBlindSwitch option is selected, UTRAN frequency steering takes effect at blind coverage-based handovers to UTRAN or blind CSFB to UTRAN. This cell-specific parameter setting takes effect only when the eNodeB-specific UtranFreqLayerBlindSwitch option is deselected. If the UtranSrvccSteeringSwitch option is selected, UTRAN frequency steering based on measurements takes effect at coverage-based SRVCC to UTRAN. This option applies only to FDD. This cell-specific parameter setting takes effect only when the eNodeBspecific UtranSrvccSteeringSwitch option is deselected. GUI Value Range: UtranFreqLayerMeasSwitch(UtranFreqLayerMeasSwitch), UtranFreqLayerBlindSwitch(UtranFreqLayerBlindSwitch), UtranSrvccSteeringSwitch(UtranSrvccSteeringSwitch) Unit: None Actual Value Range: UtranFreqLayerMeasSwitch, UtranFreqLayerBlindSwitch, UtranSrvccSteeringSwitch Default Value: UtranFreqLayerMeasSwitch:Off, UtranFreqLayerBlindSwitch:Off, UtranSrvccSteeringSwitch:Off

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195

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

ENodeB AlgoSwi tch

HoAlgo Switch

MOD ENODE BALGO SWITC H

LBFD-0 0201801 / TDLBF D-00201 801

Coverag e Based Intrafrequenc y Handov er Distance Based Interfrequenc y Handov er Service Based Interfrequenc y Handov er CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT Flash CS Fallback to UTRAN Flash CS Fallback to GERAN CS Fallback

Meaning: Indicates whether to enable handover algorithms. This parameter includes the following options: IntraFreqCoverHoSwitch: If this option is selected, coverage-based intra-frequency handovers are enabled to ensure service continuity. If this option is deselected, coverage-based intra-frequency handovers are disabled. InterFreqCoverHoSwitch: If this option is selected, coverage-based inter-frequency handovers are enabled to ensure service continuity. If this option is deselected, coverage-based interfrequency handovers are disabled. UtranCsfbSwitch: If this option is selected, CSFB to UTRAN is enabled and UEs can fall back to UTRAN. If this option is deselected, CSFB to UTRAN is disabled. GeranCsfbSwitch: If this option is selected, CSFB to GERAN is enabled and UEs can fall back to GERAN. If this option is deselected, CSFB to GERAN is disabled. Cdma1xRttCsfbSwitch: If this option is selected, CSFB to CDMA2000 1xRTT is enabled and UEs can fall back to CDMA2000 1xRTT. If this option is deselected, CSFB to CDMA2000 1xRTT is disabled. UtranServiceHoSwitch: If this option is selected, service-based handovers to UTRAN are enabled and UEs using a specific type of services can be handed over to UTRAN. If this option is deselected, service-based handovers to UTRAN are disabled. GeranServiceHoSwitch: If this option is selected, service-based handovers to GERAN are enabled and UEs using a specific type of services can be handed over to GERAN. If this option is deselected, service-based handovers to GERAN are disabled. CdmaHrpdServiceHoSwitch: If this option is selected, service-based handovers to CDMA2000 HRPD cells are enabled and UEs using a specific type of services can be handed over to CDMA2000 HRPD cells. If this option is deselected, service-based handovers to CDMA2000 HRPD cells are disabled. This option is not supported in this version. Cdma1xRttServiceHoSwitch: If this option is selected, service-based handovers to CDMA2000 1xRTT are enabled and UEs using a specific type of services can be handed over to CDMA2000 1xRTT. If this option is deselected, service-based handovers to CDMA2000 1xRTT are disabled. This option is not supported in this version. UlQualityInterRATHoSwitch: If this option is selected, UL-quality-based inter-RAT handovers are enabled and UEs can be handed over to inter-RAT cells to ensure service

LST ENODE BALGO SWITC H

LBFD-0 0201802 / TDLBF D-00201 802 LBFD-0 0201804 / TDLBF D-00201 804 LBFD-0 0201805 / TDLBF D-00201 805 LOFD-0 01033 / TDLOF D-00103 3 LOFD-0 01034 / TDLOF D-00103 4 LOFD-0 01035 / TDLOF D-00103 5 LOFD-0 01052 / TDLOF D-00105 2 LOFD-0 01053 /

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196

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

TDLOF D-00105 3

Steering to UTRAN

LOFD-0 01088 / TDLOF D-00108 8

CS Fallback Steering to GERAN

LOFD-0 01089 / TDLOF D-00108 9

Enhance d CS Fallback to CDMA2 000 1xRTT

continuity when the UL signal quality is poor. If this option is deselected, UL-quality-based inter-RAT handovers are disabled. InterPlmnHoSwitch: If this option is selected, inter-PLMN handovers are enabled and UEs can be handed over to cells in other PLMNs. If this option is deselected, inter-PLMN handovers are disabled. UtranFlashCsfbSwitch: This option takes effect only when the UtranCsfbSwitch option is selected. If the UtranFlashCsfbSwitch option is selected, flash CSFB to UTRAN is enabled and the eNodeB sends system information of candidate target UTRAN cells to UEs during redirection. If the UtranFlashCsfbSwitch option is deselected, flash CSFB to UTRAN is disabled. GeranFlashCsfbSwitch: This option takes effect only when the GeranCsfbSwitch option is selected. If the GeranFlashCsfbSwitch option is selected, flash CSFB to GERAN is enabled and the eNodeB sends system information of candidate target GERAN cells to UEs during redirection. If the GeranFlashCsfbSwitch option is deselected, flash CSFB to GERAN is disabled. ServiceBasedInterFreqHoSwitch: If this option is selected, service-based inter-frequency handovers are enabled and UEs using a specific type of services can be handed over to inter-frequency cells. If this option is deselected, service-based interfrequency handovers are disabled. UlQualityInterFreqHoSwitch: If this option is selected, UL-quality-based inter-frequency handovers are enabled and UEs can be handed over to interfrequency cells to ensure service continuity when the UL signal quality is poor. If this option is deselected, UL-quality-based inter-frequency handovers are disabled. CsfbAdaptiveBlindHoSwitch: This option takes effect only when blind handovers are enabled. If both the BlindHoSwitch and UFCsfbBlindHoDisSwitch options are selected, the CsfbAdaptiveBlindHoSwitch option of the HoAlgoSwitch parameter does not take effect when a UE is handed over to a UTRAN or GERAN cell using ultra-flash CS fallback. If the CsfbAdaptiveBlindHoSwitch option is selected, adaptive blind handovers for CSFB are enabled and appropriate handover mechanisms are selected for UEs based on their locations. If the CsfbAdaptiveBlindHoSwitch option is deselected, adaptive blind handovers for CSFB are disabled. UtranCsfbSteeringSwitch: If this option is selected, CSFB steering to UTRAN is enabled and CSFB

LOFD-0 01090 / TDLOF D-00109 0 LOFD-0 01019 / TDLOF D-00101 9 LOFD-0 01020 / TDLOF D-00102 0 LOFD-0 01043 / TDLOF D-00104 3 LOFD-0 01046 / TDLOF D-00104 6 LOFD-0 01072 / TDLOF D-00107 2 LOFD-0 01073 / TDLOF Issue 02 (2016-04-20)

9 Parameters

PS InterRAT Mobility between EUTRAN and UTRAN PS InterRAT Mobility between EUTRAN and GERAN Service based interRAT handove r to UTRAN Service based interRAT handove r to GERAN Distance based

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

Description

D-00107 3

interRAT handove r to UTRAN

policies for UEs in idle mode can be configured. If this option is deselected, CSFB steering to UTRAN is disabled. GeranCsfbSteeringSwitch: If this option is selected, CSFB steering to GERAN is enabled and CSFB policies for UEs in idle mode can be configured. If this option is deselected, CSFB steering to GERAN is disabled. CSFBLoadInfoSwitch: If this option is selected, load-based CSFB is enabled and a target cell for CSFB is selected based on loads of candidate target cells. If this option is deselected, load-based CSFB is disabled. Cdma1XrttEcsfbSwitch: If this option is selected, eCSFB to CDMA2000 1xRTT is enabled and UEs can fall back to CDMA2000 1xRTT through handovers. If this option is deselected, eCSFB to CDMA2000 1xRTT is disabled. EmcBlindHoA1Switch: If this option is selected, blind handover event A1 measurements are enabled. If a blind handover event measurement conflicts with a handover procedure, an emergency blind handover can be triggered after the handover procedure is complete. If this option is deselected, blind handover event A1 measurements are disabled. If a blind handover event measurement conflicts with a handover procedure, an emergency blind handover cannot be triggered. EmcInterFreqBlindHoSwitch: If this option is selected, the eNodeB preferentially performs an inter-frequency blind handover when an emergency blind handover is triggered. If this option is deselected, the eNodeB only performs an inter-RAT blind handover when an emergency blind handover is triggered. EPlmnSwitch: Indicates whether handovers to neighboring cells under the equivalent PLMNs (EPLMNs) are allowed. When inter-PLMN handovers are allowed, handovers to neighboring cells under the EPLMNs are allowed if this option is selected, and not allowed if this option is deselected. The EPLMNs are delivered by the MME to the UE. ServiceBasedInterFreqHoSwitch: If this option is selected, service-based inter-frequency handovers are enabled and UEs using a specific type of services can be handed over to interfrequency cells. If this option is deselected, servicebased inter-frequency handovers are disabled. This option applies only to LTE TDD. VoipHoControlSwitch: Indicates whether the eNodeB filters out target cells that do not support VoLTE services when processing intra-RAT handovers for VoLTE services. UtranUltraFlashCsfbSwitch: If this option is selected, ultra-flash CSFB to UTRAN is

TDLBF D-00201 8 TDLOF D-00102 2 TDLOF D-07022 8 LOFD-0 81283 / TDLOF D-08120 3 LOFD-0 70202 / TDLOF D-07020 2 TDLOF D-08122 3

Distance based interRAT handove r to GERAN Mobility Manage ment Coverag e Based Interfrequenc y Handov er SRVCC to UTRAN ServiceRequest Based Interfrequenc y Handov er UltraFlash CSFB to GERAN UltraFlash CSFB to UTRAN UltraFlash CSFB to UTRAN

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

enabled. If this option is deselected, ultra-flash CSFB to UTRAN is disabled. GeranUltraFlashCsfbSwitch: If this option is selected, ultra-flash CSFB to GERAN is enabled. If this option is deselected, ultra-flash CSFB to GERAN is disabled. RatLayerSwitch: If this option is selected, the eNodeB selects different target RATs for voice services and data services during coverage-based inter-RAT handovers. If this option is deselected, the eNodeB does not select different target RATs for voice services and data services during coverage-based inter-RAT handovers. GUI Value Range: IntraFreqCoverHoSwitch(IntraFreqCoverHoSwitch), InterFreqCoverHoSwitch(InterFreqCoverHoSwitch), UtranCsfbSwitch(UtranCsfbSwitch), GeranCsfbSwitch(GeranCsfbSwitch), Cdma1xRttCsfbSwitch(Cdma20001xRttCsfbSwitch), UtranServiceHoSwitch(UtranServiceHoSwitch), GeranServiceHoSwitch(GeranServiceHoSwitch), CdmaHrpdServiceHoSwitch(Cdma2000HrpdServiceHoSwitch), Cdma1xRttServiceHoSwitch(Cdma20001xRttService HoSwitch), UlQualityInterRATHoSwitch(UlQualityInterRATHoSwitch), InterPlmnHoSwitch(InterPlmnHoSwitch), UtranFlashCsfbSwitch(UtranFlashCsfbSwitch), GeranFlashCsfbSwitch(GeranFlashCsfbSwitch), ServiceBasedInterFreqHoSwitch(ServiceBasedInterFreqHoSwitch), UlQualityInterFreqHoSwitch(UlQualityInterFreqHoSwitch), CsfbAdaptiveBlindHoSwitch(CsfbAdaptiveBlindHoSwitch), UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch), GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch), CSFBLoadInfoSwitch(CSFBLoadInfoSwitch), Cdma1XrttEcsfbSwitch(Cdma1XrttEcsfbSwitch), EmcBlindHoA1Switch(EmcBlindHoA1Switch), EmcInterFreqBlindHoSwitch(EmcInterFreqBlindHoSwitch), EPlmnSwitch(EPlmnSwitch), ServiceReqInterFreqHoSwitch(ServiceReqInterFreqHoSwitch), VoipHoControlSwitch(VoipHoControlSwitch), UtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbSwitch), GeranUltraFlashCsfbSwitch(GeranUltraFlashCsfbSwitch), RatLayerSwitch(RatLayerSwitch) Unit: None

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

Actual Value Range: IntraFreqCoverHoSwitch, InterFreqCoverHoSwitch, UtranCsfbSwitch, GeranCsfbSwitch, Cdma1xRttCsfbSwitch, UtranServiceHoSwitch, GeranServiceHoSwitch, CdmaHrpdServiceHoSwitch, Cdma1xRttServiceHoSwitch, UlQualityInterRATHoSwitch, InterPlmnHoSwitch, UtranFlashCsfbSwitch, GeranFlashCsfbSwitch, ServiceBasedInterFreqHoSwitch, UlQualityInterFreqHoSwitch, CsfbAdaptiveBlindHoSwitch, UtranCsfbSteeringSwitch, GeranCsfbSteeringSwitch, CSFBLoadInfoSwitch, Cdma1XrttEcsfbSwitch, EmcBlindHoA1Switch, EmcInterFreqBlindHoSwitch, EPlmnSwitch, ServiceReqInterFreqHoSwitch, VoipHoControlSwitch, UtranUltraFlashCsfbSwitch, GeranUltraFlashCsfbSwitch, RatLayerSwitch Default Value: IntraFreqCoverHoSwitch:On, InterFreqCoverHoSwitch:On, UtranCsfbSwitch:Off, GeranCsfbSwitch:Off, Cdma1xRttCsfbSwitch:Off, UtranServiceHoSwitch:Off, GeranServiceHoSwitch:Off, CdmaHrpdServiceHoSwitch:Off, Cdma1xRttServiceHoSwitch:Off, UlQualityInterRATHoSwitch:Off, InterPlmnHoSwitch:Off, UtranFlashCsfbSwitch:Off, GeranFlashCsfbSwitch:Off, ServiceBasedInterFreqHoSwitch:Off, UlQualityInterFreqHoSwitch:Off, CsfbAdaptiveBlindHoSwitch:Off, UtranCsfbSteeringSwitch:Off, GeranCsfbSteeringSwitch:Off, CSFBLoadInfoSwitch:Off, Cdma1XrttEcsfbSwitch:Off, EmcBlindHoA1Switch:Off, EmcInterFreqBlindHoSwitch:Off, EPlmnSwitch:Off, ServiceReqInterFreqHoSwitch:Off, VoipHoControlSwitch:Off, UtranUltraFlashCsfbSwitch:Off, GeranUltraFlashCsfbSwitch:Off, RatLayerSwitch:Off

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

GlobalP rocSwitc h

UeCom patSwitc h

MOD GLOBA LPROC SWITC H

LBFD-0 0201802 / TDLBF D-00201 802

Coverag e Based Interfrequenc y Handov er

Meaning:

LST GLOBA LPROC SWITC H

LBFD-0 0201804 / TDLBF D-00201 804 LBFD-0 0201805 / TDLBF D-00201 805

Distance Based InterFrequen cy Handov er Service Based Interfrequenc y Handov er

Indicates whether to enable compatibility optimization functions for UEs to control the differentiated handling of abnormal UEs. AbnormalUeHandleSwitch: This option specifies whether to enable handling of abnormal UEs. This function is enabled only if this option is selected. PerExtendBitSw: Indicate whether to encode extended bit indicators for Uu messages if extended IEs specified by later 3GPP releases are not included in Uu message code. If this option is selected, extended bit indicators are not encoded. If this option is deselected, extended bit indicators are encoded. InterFddTddMeasComOptSw: Indicates whether to enable compatibility optimization on inter-duplexmode measurements for UEs. If a UE can send interduplex-mode measurement reports but actually cannot perform inter-duplex-mode measurements, this UE incompatibility issue may cause an increase in the service drop rate. If this option is selected, the eNodeB is not allowed to deliver inter-duplex-mode measurement configurations to such UEs. MOUeCompatEffectSw: Indicates whether the UeCompat MO takes effect. If this option is selected, the UeCompat MO but not the UeCompatOpt MO takes effect. If this option is deselected, the UeCompatOpt MO but not the UeCompat MO takes effect. GUI Value Range: AbnormalUeHandleSwitch(AbnormalUeHandleSwitch), UltraFlashCsfbComOptSw(UltraFlashCsfbComOptSw), ForbidR8R9UeAccessB41Sw(ForbidR8R9UeAccess B41Sw), MOUeCompatEffectSw( MOUeCompatEffectSw), PerExtendBitSw(PerExtendBitSw), InterFddTddMeasComOptSw(InterFddTddMeasComOptSw) Unit: None Actual Value Range: AbnormalUeHandleSwitch, UltraFlashCsfbComOptSw, ForbidR8R9UeAccessB41Sw, MOUeCompatEffectSw, PerExtendBitSw, InterFddTddMeasComOptSw Default Value: AbnormalUeHandleSwitch:Off, UltraFlashCsfbComOptSw:Off,

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

ForbidR8R9UeAccessB41Sw:Off, MOUeCompatEffectSw:Off, PerExtendBitSw:Off, InterFddTddMeasComOptSw:Off ENodeB AlgoSwi tch

FreqLay erSwtich

MOD ENODE BALGO SWITC H LST ENODE BALGO SWITC H

LOFD-0 01087 LOFD-0 01078 / TDLOF D-00107 8 TDLOF D-00102 2 TDLOF D-00103 3 TDLOF D-00105 2 TDLOF D-00108 8

SRVCC Flexible Steering to UTRAN EUTRAN to UTRAN CS/PS Steering SRVCC to UTRAN CS Fallback to UTRAN Flash CS Fallback to UTRAN CS Fallback Steering to UTRAN

Issue 02 (2016-04-20)

Meaning: This parameter includes the following three switches: UtranFreqLayerMeasSwitch, UtranFreqLayerBlindSwitch, and UtranSrvccSwitch. The setting of UtranSrvccSwitch takes effect only when UtranFreqLayerMeasSwitch is on. If UtranFreqLayerMeasSwitch is on, the UTRAN hierarchy-based measurement algorithm takes effect for measurements related to coverage-based and CSFB-triggered handovers from E-UTRAN to UTRAN. If UtranFreqLayerBlindSwitch is on, the UTRAN hierarchy-based blind-handover algorithm takes effect for coverage-based and CSFB-triggered blind handovers from E-UTRAN to UTRAN. If UtranSrvccSwitch is on, the UTRAN SRVCC hierarchy-based measurement algorithm takes effect for coverage-based SRVCC-triggered handovers from E-UTRAN to UTRAN. GUI Value Range: UtranFreqLayerMeasSwitch(UtranFreqLayerMeasSwitch), UtranFreqLayerBlindSwitch(UtranFreqLayerBlindSwitch), UtranSrvccSteeringSwitch(UtranSrvccSteeringSwitch) Unit: None Actual Value Range: UtranFreqLayerMeasSwitch, UtranFreqLayerBlindSwitch, UtranSrvccSteeringSwitch Default Value: UtranFreqLayerMeasSwitch:Off, UtranFreqLayerBlindSwitch:Off, UtranSrvccSteeringSwitch:Off

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranNF req

CsPriori ty

ADD UTRAN NFREQ

LOFD-0 01078 / TDLOF D-00107 8

EUTRAN to UTRAN CS/PS Steering

Meaning: Indicates the circuit switched (CS) priority of the neighboring UTRAN frequency, that is, the priority for the neighboring UTRAN frequency to carry CS services. During CSFB-based CS service handovers with UtranFreqLayerMeasSwitch being on, the eNodeB selects and delivers the neighboring UTRAN frequencies based on the CS priorities when starting measurements. The eNodeB preferentially delivers the UTRAN frequency with the highest CS priority to measure. During CSFB-based CS service handovers with UtranFreqLayerBlindSwitch being on, the eNodeB selects the target cells for blind handovers on neighboring UTRAN frequencies based on the CS priorities and preferentially selects the target cell for blind handovers on the neighboring UTRAN frequency with the highest CS priorities. If this parameter is set to Priority_0, this neighboring UTRAN frequency is not prioritized.

MOD UTRAN NFREQ LST UTRAN NFREQ

TDLOF D-00103 3 TDLOF D-00105 2 TDLOF D-00108 8

CS Fallback to UTRAN Flash CS Fallback to UTRAN CS Fallback Steering to UTRAN

GUI Value Range: Priority_0(Priority 0), Priority_1(Priority 1), Priority_2(Priority 2), Priority_3(Priority 3), Priority_4(Priority 4), Priority_5(Priority 5), Priority_6(Priority 6), Priority_7(Priority 7), Priority_8(Priority 8), Priority_9(Priority 9), Priority_10(Priority 10), Priority_11(Priority 11), Priority_12(Priority 12), Priority_13(Priority 13), Priority_14(Priority 14), Priority_15(Priority 15), Priority_16(Priority 16) Unit: None Actual Value Range: Priority_0, Priority_1, Priority_2, Priority_3, Priority_4, Priority_5, Priority_6, Priority_7, Priority_8, Priority_9, Priority_10, Priority_11, Priority_12, Priority_13, Priority_14, Priority_15, Priority_16 Default Value: Priority_2(Priority 2)

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

IdleCsfb Highest Pri

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01035 / TDLOF D-00103 5

Meaning:

LST CSFAL LBACK BLIND HOCFG

LOFD-0 01088 / TDLOF D-00108 8

CS Fallback to CDMA2 000 1xRTT

LOFD-0 01089 / TDLOF D-00108 9 TDLOF D-00109 0

Issue 02 (2016-04-20)

CS Fallback Steering to UTRAN CS Fallback Steering to GERAN

Indicates the highest-priority RAT for CSFB initiated by a UE in idle mode. It is UTRAN by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the highest-priority RAT is UTRAN, GERAN, or CDMA2000, respectively. The value CDMA2000 is invalid in the current version. Therefore, avoid setting this parameter to CDMA2000. GUI Value Range: UTRAN, GERAN, CDMA2000 Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000 Default Value: UTRAN

Enhance d CS Fallback to CDMA2 000 1xRTT

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204

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellOp HoCfg

IdleCsfb Highest Pri

ADD CELLO PHOCF G

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the highest-priority target RAT for CSFB initiated by UEs in idle mode. It is UTRAN by default. This parameter can be set to UTRAN, GERAN, or CDMA2000.

CS Fallback to GERAN

GUI Value Range: UTRAN, GERAN, CDMA2000

MOD CELLO PHOCF G LST CELLO PHOCF G

LOFD-0 01034 / TDLOF D-00103 4 LOFD-0 01035 / TDLOF D-00103 5 LOFD-0 01052 / TDLOF D-00105 2 LOFD-0 01053 / TDLOF D-00105 3 LOFD-0 01090 / TDLOF D-00109 0 LOFD-0 70202 / TDLOF D-07020 2 LOFD-0 81283 / TDLOF D-08120 3

Issue 02 (2016-04-20)

CS Fallback to CDMA2 000 1xRTT

Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000 Default Value: UTRAN

Flash CS Fallback to UTRAN Flash CS Fallback to GERAN Enhance d CS Fallback to CDMA2 000 1xRTT UltraFlash CSFB to UTRAN UltraFlash CSFB to GERAN

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

IdleCsfb SecondP ri

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01035 / TDLOF D-00103 5

Meaning:

LST CSFAL LBACK BLIND HOCFG

LOFD-0 01088 / TDLOF D-00108 8

CS Fallback to CDMA2 000 1xRTT

LOFD-0 01089 / TDLOF D-00108 9 TDLOF D-00109 0

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CS Fallback Steering to UTRAN CS Fallback Steering to GERAN Enhance d CS Fallback to CDMA2 000 1xRTT

Indicates the medium-priority RAT for CSFB initiated by a UE in idle mode. It is GERAN by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the medium-priority RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no medium-priority RAT is specified and only the highest-priority RAT can be selected for CSFB initiated by a UE in idle mode. The value CDMA2000 is invalid in the current version. Therefore, avoid setting this parameter to CDMA2000. GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: GERAN

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellOp HoCfg

IdleCsfb SecondP ri

ADD CELLO PHOCF G

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the medium-priority target RAT for CSFB initiated by UEs in idle mode. It is GERAN by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the medium-priority target RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no medium-priority target RAT is specified and only the highest-priority target RAT can be selected for CSFB initiated by UEs in idle mode.

MOD CELLO PHOCF G LST CELLO PHOCF G

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CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT Flash CS Fallback to UTRAN

GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: GERAN

Flash CS Fallback to GERAN Enhance d CS Fallback to CDMA2 000 1xRTT UltraFlash CSFB to UTRAN UltraFlash CSFB to GERAN

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

IdleCsfb LowestP ri

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01035 / TDLOF D-00103 5

Meaning:

LST CSFAL LBACK BLIND HOCFG

LOFD-0 01088 / TDLOF D-00108 8

CS Fallback to CDMA2 000 1xRTT

LOFD-0 01089 / TDLOF D-00108 9 TDLOF D-00109 0

Issue 02 (2016-04-20)

CS Fallback Steering to UTRAN CS Fallback Steering to GERAN Enhance d CS Fallback to CDMA2 000 1xRTT

Indicates the lowest-priority RAT for CSFB initiated by a UE in idle mode. It is CDMA2000 by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the lowest-priority RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no lowest-priority RAT is specified and only the highest- or medium-priority RAT can be selected for CSFB initiated by a UE in idle mode. The value CDMA2000 is invalid in the current version. Therefore, avoid setting this parameter to CDMA2000. GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: CDMA2000

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208

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellOp HoCfg

IdleCsfb LowestP ri

ADD CELLO PHOCF G

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the lowest-priority target RAT for CSFB initiated by UEs in idle mode. It is CDMA2000 by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the lowest-priority target RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no lowest-priority target RAT is specified and only the highest- or medium-priority target RAT can be selected for CSFB initiated by UEs in idle mode.

MOD CELLO PHOCF G LST CELLO PHOCF G

Issue 02 (2016-04-20)

CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT Flash CS Fallback to UTRAN

GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: CDMA2000

Flash CS Fallback to GERAN Enhance d CS Fallback to CDMA2 000 1xRTT UltraFlash CSFB to UTRAN UltraFlash CSFB to GERAN

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209

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackPolic yCfg

IdleMod eCsfbHo PolicyCf g

MOD CSFAL LBACK POLIC YCFG

LOFD-0 01088 / TDLOF D-00108 8

CS Fallback Steering to UTRAN

Meaning: Indicates the CSFB policy for a UE in idle mode. The policy can be PS handover, CCO, or redirection.

LST CSFAL LBACK POLIC YCFG

LOFD-0 01089 / TDLOF D-00108 9

CS Fallback Steering to GERAN

Unit: None

Issue 02 (2016-04-20)

GUI Value Range: REDIRECTION, CCO_HO, PS_HO Actual Value Range: REDIRECTION, CCO_HO, PS_HO Default Value: REDIRECTION:On, CCO_HO:On, PS_HO:On

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210

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

InterRat Highest Pri

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning:

LST CSFAL LBACK BLIND HOCFG

LOFD-0 01034 / TDLOF D-00103 4 LOFD-0 01035 / TDLOF D-00103 5 LOFD-0 01019 / TDLOF D-00101 9 LOFD-0 01020 / TDLOF D-00102 0 LOFD-0 01021 TDLOF D-00105 2 TDLOF D-00105 3 TDLOF D-00109 0 TDLOF D-00104 3

Issue 02 (2016-04-20)

CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT PS InterRAT Mobility between EUTRAN and UTRAN

Indicates the highest-priority RAT for handovers. It is UTRAN by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the highestpriority RAT is UTRAN, GERAN, or CDMA2000, respectively. The value CDMA2000 is invalid in the current version. Therefore, avoid setting this parameter to CDMA2000. GUI Value Range: UTRAN, GERAN, CDMA2000 Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000 Default Value: UTRAN

PS InterRAT Mobility between EUTRAN and GERAN PS InterRAT Mobility between EUTRAN and CDMA2 000

TDLOF D-00107 2

Flash CS Fallback to UTRAN

TDLOF D-00104 6

Flash CS Fallback

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211

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

TDLOF D-00107 3

to GERAN

Description

Enhance d CS Fallback to CDMA2 000 1xRTT Service based InterRAT handove r to UTRAN Distance based InterRAT handove r to UTRAN Service based InterRAT handove r to GERAN Distance based InterRAT handove r to GERAN

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212

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellOp HoCfg

InterRat Highest Pri

ADD CELLO PHOCF G

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the highest-priority target RAT for handovers. It is UTRAN by default. This parameter can be set to UTRAN, GERAN, or CDMA2000.

CS Fallback to GERAN

Unit: None

MOD CELLO PHOCF G LST CELLO PHOCF G

LOFD-0 01034 / TDLOF D-00103 4 LOFD-0 01035 / TDLOF D-00103 5 LOFD-0 01019 / TDLOF D-00101 9 LOFD-0 01020 / TDLOF D-00102 0 LOFD-0 01021 / TDLOF D-00102 1 LOFD-0 01052 / TDLOF D-00105 2 LOFD-0 01053 / TDLOF D-00105 3 LOFD-0 01090 / TDLOF D-00109 0

Issue 02 (2016-04-20)

GUI Value Range: UTRAN, GERAN, CDMA2000 Actual Value Range: UTRAN, GERAN, CDMA2000 Default Value: UTRAN

CS Fallback to CDMA2 000 1xRTT PS InterRAT Mobility between EUTRAN and UTRAN PS InterRAT Mobility between EUTRAN and GERAN PS InterRAT Mobility between EUTRAN and CDMA2 000 Flash CS Fallback to UTRAN Flash CS Fallback

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213

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

LOFD-0 70202 / TDLOF D-07020 2

to GERAN

LOFD-0 81283 / TDLOF D-08120 3

Description

Enhance d CS Fallback to CDMA2 000 1xRTT UltraFlash CSFB to UTRAN UltraFlash CSFB to GERAN

Issue 02 (2016-04-20)

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214

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

InterRat SecondP ri

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning:

LST CSFAL LBACK BLIND HOCFG

Issue 02 (2016-04-20)

CS Fallback to GERAN

Indicates the medium-priority RAT for handovers. It is GERAN by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the mediumpriority RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no medium-priority RAT is specified and only the highest-priority RAT can be selected for handovers.

CS Fallback to CDMA2 000 1xRTT

The value CDMA2000 is invalid in the current version. Therefore, avoid setting this parameter to CDMA2000.

PS InterRAT Mobility between EUTRAN and UTRAN

Unit: None

GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: GERAN

PS InterRAT Mobility between EUTRAN and GERAN PS InterRAT Mobility between EUTRAN and CDMA2 000

TDLOF D-00107 2

Flash CS Fallback to UTRAN

TDLOF D-00104 6

Flash CS Fallback

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215

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

TDLOF D-00107 3

to GERAN

Description

Issue 02 (2016-04-20)

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216

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellOp HoCfg

InterRat SecondP ri

ADD CELLO PHOCF G

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the medium-priority target RAT for handovers. It is GERAN by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the medium-priority target RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no medium-priority target RAT is specified and only the highest-priority target RAT can be selected for handovers.

MOD CELLO PHOCF G LST CELLO PHOCF G

Issue 02 (2016-04-20)

CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT PS InterRAT Mobility between EUTRAN and UTRAN

GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: GERAN

PS InterRAT Mobility between EUTRAN and GERAN PS InterRAT Mobility between EUTRAN and CDMA2 000 Flash CS Fallback to UTRAN Flash CS Fallback

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217

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

LOFD-0 70202 / TDLOF D-07020 2

to GERAN

LOFD-0 81283 / TDLOF D-08120 3

Description

Enhance d CS Fallback to CDMA2 000 1xRTT UltraFlash CSFB to UTRAN UltraFlash CSFB to GERAN

Issue 02 (2016-04-20)

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218

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

InterRat LowestP ri

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning:

LST CSFAL LBACK BLIND HOCFG

Issue 02 (2016-04-20)

CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT PS InterRAT Mobility between EUTRAN and UTRAN

Indicates the lowest-priority RAT for handovers. It is CDMA2000 by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the lowest-priority RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no lowest-priority RAT is specified and only the highestor medium-priority RAT can be selected for handovers. The value CDMA2000 is invalid in the current version. Therefore, avoid setting this parameter to CDMA2000. GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: CDMA2000

PS InterRAT Mobility between EUTRAN and GERAN PS InterRAT Mobility between EUTRAN and CDMA2 000

TDLOF D-00107 2

Flash CS Fallback to UTRAN

TDLOF D-00104 6

Flash CS Fallback

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219

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

TDLOF D-00107 3

to GERAN

Description

Issue 02 (2016-04-20)

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220

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellOp HoCfg

InterRat LowestP ri

ADD CELLO PHOCF G

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the lowest-priority target RAT for handovers. It is CDMA2000 by default. If this parameter is set to UTRAN, GERAN, or CDMA2000, the lowest-priority target RAT is UTRAN, GERAN, or CDMA2000, respectively. If this parameter is set to NULL, no lowest-priority target RAT is specified and only the highest- or medium-priority target RAT can be selected for handovers.

MOD CELLO PHOCF G LST CELLO PHOCF G

Issue 02 (2016-04-20)

CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT PS InterRAT Mobility between EUTRAN and UTRAN

GUI Value Range: UTRAN, GERAN, CDMA2000, NULL Unit: None Actual Value Range: UTRAN, GERAN, CDMA2000, NULL Default Value: CDMA2000

PS InterRAT Mobility between EUTRAN and GERAN PS InterRAT Mobility between EUTRAN and CDMA2 000 Flash CS Fallback to UTRAN Flash CS Fallback

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221

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

LOFD-0 70202 / TDLOF D-07020 2

to GERAN

LOFD-0 81283 / TDLOF D-08120 3

Description

Enhance d CS Fallback to CDMA2 000 1xRTT UltraFlash CSFB to UTRAN UltraFlash CSFB to GERAN

Issue 02 (2016-04-20)

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222

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranNF req

CsPsMi xedPrior ity

ADD UTRAN NFREQ

LOFD-0 01088 / TDLOF D-00108 8

CS Fallback Steering to UTRAN

LOFD-0 01019 / TDLOF D-00101 9

PS InterRAT Mobility between EUTRAN and UTRAN

Meaning: Indicates the priority for the neighboring UTRAN frequency to carry CS+PS combined services. In measurement-based CSFB to UTRAN, if UtranCsfbSteeringSwitch and UtranFreqLayerMeasSwitch are turned on, the eNodeB determines the UTRAN frequency to be delivered to a UE in RRC_CONNECTED mode based on the priority specified by this parameter. The eNodeB preferentially delivers the UTRAN frequency with the highest CS+PS combined service priority to the UE. In blind CSFB to UTRAN, if UtranCsfbSteeringSwitch and UtranFreqLayerBlindSwitch are turned on, the target cell is selected based on the priority specified by this parameter. The cell on the UTRAN frequency with the highest priority is preferentially selected. If this parameter is set to Priority_0, the UTRAN frequency is not included in priority arrangement for neighboring UTRAN frequencies to carry CS+PS combined services.

MOD UTRAN NFREQ LST UTRAN NFREQ

TDLOF D-00103 3 TDLOF D-00105 2 TDLOF D-00107 8

CS Fallback to UTRAN Flash CS Fallback to UTRAN EUTRAN to UTRAN CS/PS steering

Issue 02 (2016-04-20)

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223

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackPolic yCfg

CsfbHo PolicyCf g

MOD CSFAL LBACK POLIC YCFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the CSFB policy for a UE in connected mode. If the CSFB steering function is disabled, this parameter also applies to UEs in idle mode. The policy can be PS handover, CCO, or redirection.

LST CSFAL LBACK POLIC YCFG

LOFD-0 01034 / TDLOF D-00103 4 LOFD-0 01088 / TDLOF D-00108 8 LOFD-0 01089 / TDLOF D-00108 9

CSFallB ackHo

CsfbHo UtranB1 ThdRsc p

MOD CSFAL LBACK HO LST CSFAL LBACK HO

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to GERAN CS Fallback Steering to UTRAN

GUI Value Range: REDIRECTION, CCO_HO, PS_HO Unit: None Actual Value Range: REDIRECTION, CCO_HO, PS_HO Default Value: REDIRECTION:On, CCO_HO:On, PS_HO:On

CS Fallback Steering to GERAN

CS Fallback to UTRAN

Meaning: Indicates the RSCP threshold for event B1, which is used in CS fallback to UTRAN. When CS fallback to UTRAN is applicable, this parameter is set for UEs and used in the evaluation about whether to trigger event B1. This parameter indicates the RSCP requirement for the UTRAN cells to be included in the measurement report. A UE sends a measurement report related to event B1 to the eNodeB when the RSCP in at least one UTRAN cell exceeds this threshold and other triggering conditions are met. For details, see 3GPP TS 36.331. GUI Value Range: -120~-25 Unit: dBm Actual Value Range: -120~-25 Default Value: -106

Issue 02 (2016-04-20)

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224

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

InterRat HoCom m

InterRat HoUtran B1Meas Quan

MOD INTER RATHO COMM

LOFD-0 01019 / TDLOF D-00101 9

PS InterRAT Mobility between EUTRAN and UTRAN

Meaning: Indicates the quantity to be measured for handovers to UTRAN. For details, see 3GPP TS 36.331. This parameter applies only to UTRAN FDD. The RSCP values are relatively stable, while the Ec/No values fluctuate with the network load. The value BOTH applies only to UEs complying with 3GPP Release 10. For UEs complying with 3GPP Release 8 or 9, the value BOTH is equivalent to the value RSCP. QoE-based handover algorithms do not apply to UEs complying with 3GPP Release 8 and Release 9, and the parameter value is fixed as ECN0.

LST INTER RATHO COMM

LOFD-0 01022 / TDLOF D-00102 2 LOFD-0 01033 / TDLOF D-00103 3

CSFallB ackHo

CsfbHo UtranB1 ThdEcn 0

MOD CSFAL LBACK HO LST CSFAL LBACK HO

LOFD-0 01033 / TDLOF D-00103 3

SRVCC to UTRAN CS Fallback to UTRAN

GUI Value Range: RSCP, ECN0, BOTH

CS Fallback to UTRAN

Meaning: Indicates the Ec/N0 threshold for event B1, which is used in CS fallback to UTRAN. When CS fallback to UTRAN is required, this parameter is set for UEs and used in the evaluation about whether to trigger event B1. This parameter indicates the Ec/N0 requirement for the UTRAN cells to be included in the measurement report. A UE sends a measurement report related to event B1 to the eNodeB when the Ec/N0 in at least one UTRAN cell exceeds this threshold and other triggering conditions are met. For a cell with large signal fading variance, set this parameter to a large value to prevent unnecessary handovers. For a cell with small signal fading variance, set this parameter to a small value to ensure timely handovers. For details, see 3GPP TS 36.331.

Unit: None Actual Value Range: RSCP, ECN0, BOTH Default Value: ECN0

GUI Value Range: -48~0 Unit: 0.5dB Actual Value Range: -24~0 Default Value: -24

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225

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackHo

CsfbHo UtranTi meToTri g

MOD CSFAL LBACK HO

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the time-to-trigger for event B1 that is used in CS fallback to UTRAN. When CS fallback to UTRAN is applicable, this parameter is set for UEs and used in the evaluation of whether to trigger event B1. When detecting that the signal quality in at least one UTRAN cell meets the entering condition, the UE does not send a measurement report to the eNodeB immediately. Instead, the UE sends a report only when the signal quality continuously meets the entering condition during the time-totrigger. This parameter helps decrease the number of occasionally triggered event reports, the average number of handovers, and the number of wrong handovers, and thus helps to prevent unnecessary handovers. For details, see 3GPP TS 36.331.

LST CSFAL LBACK HO

GUI Value Range: 0ms, 40ms, 64ms, 80ms, 100ms, 128ms, 160ms, 256ms, 320ms, 480ms, 512ms, 640ms, 1024ms, 1280ms, 2560ms, 5120ms Unit: ms Actual Value Range: 0ms, 40ms, 64ms, 80ms, 100ms, 128ms, 160ms, 256ms, 320ms, 480ms, 512ms, 640ms, 1024ms, 1280ms, 2560ms, 5120ms Default Value: 40ms

Issue 02 (2016-04-20)

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226

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

ENodeB AlgoSwi tch

HoMode Switch

MOD ENODE BALGO SWITC H

LOFD-0 01022 / TDLOF D-00102 2

SRVCC to UTRAN

Meaning:

LST ENODE BALGO SWITC H

LOFD-0 01023 / TDLOF D-00102 3 LOFD-0 01033 / TDLOF D-00103 3 LOFD-0 01034 / TDLOF D-00103 4 LOFD-0 01019 / TDLOF D-00101 9 LOFD-0 01020 / TDLOF D-00102 0 LOFD-0 01021 / TDLOF D-00102 1 TDLOF D-00105 2 TDLOF D-00108 8 TDLOF D-00104 3

SRVCC to GERAN CS Fallback to UTRAN CS Fallback to GERAN PS InterRAT Mobility between EUTRAN and UTRAN PS InterRAT Mobility between EUTRAN and GERAN PS InterRAT Mobility between EUTRAN and CDMA2 000 Flash CS Fallback to UTRAN CS Fallback

Issue 02 (2016-04-20)

Indicates whether to enable or disable different types of handovers, based on which the eNodeB determines handover policies. UtranVoipCapSwitch: If this switch is on, UTRAN supports VoIP. If this switch is off, UTRAN does not support VoIP. Cdma1xRttVoipCapSwitch: If this switch is on, CDMA2000 1xRTT supports VoIP. If this switch is off, CDMA2000 1xRTT does not support VoIP. UtranPsHoSwitch: If this switch is on, UTRAN supports PS handovers. If this switch is off, UTRAN does not support PS handovers. GeranPsHoSwitch: If this switch is on, GERAN supports PS handovers. If this switch is off, GERAN does not support PS handovers. CdmaHrpdNonOptimisedHoSwitch: If this switch is on, non-optimized handovers to CDMA2000 HRPD are enabled. If this switch is off, non-optimized handovers to CDMA2000 HRPD are disabled. CdmaHrpdOptimisedHoSwitch: If this switch is turned on, optimized handovers to CDMA2000 HRPD are enabled. If this switch is off, optimized handovers to CDMA2000 HRPD are disabled. GeranNaccSwitch: This switch does not take effect if GeranCcoSwitch is off. If this switch is on, the GERAN supports network assisted cell change (NACC). If this switch is off, the GERAN does not support NACC. GeranCcoSwitch: If this switch is on, the GERAN supports cell change order (CCO). If this switch is off, the GERAN does not support CCO. UtranSrvccSwitch: If this switch is on, the UTRAN supports SRVCC. If this switch is off, the UTRAN does not support SRVCC. GeranSrvccSwitch: If this switch is on, the GERAN supports SRVCC. If this switch is off, the GERAN does not support SRVCC. Cdma1xRttSrvccSwitch: If this switch is on, the CDMA2000 1xRTT supports SRVCC. If this switch is off, the CDMA2000 1xRTT does not support SRVCC.

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227

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

9 Parameters

Feature ID

Feature Name

Description

TDLOF D-00107 2

Steering to UTRAN

UtranRedirectSwitch: If this switch is on, redirection to UTRAN is enabled. If this switch is turned off, redirection to UTRAN is disabled.

TDLOF D-00104 6

Service based InterRAT handove r to UTRAN

GeranRedirectSwitch: If this switch is on, redirection to GERAN is enabled. If this switch is off, redirection to GERAN is disabled.

TDLOF D-00107 3

Distance based InterRAT handove r to UTRAN Service based InterRAT handove r to GERAN Distance based InterRAT handove r to GERAN

CdmaHrpdRedirectSwitch: If this switch is on, redirection to CDMA2000 HRPD is enabled. If this switch is off, redirection to CDMA2000 HRPD is disabled. Cdma1xRttRedirectSwitch: If this switch is on, redirection to CDMA2000 1xRTT is enabled. If this switch is off, redirection to CDMA2000 1xRTT is disabled. BlindHoSwitch: If this switch is on, blind handovers for CSFB are enabled. If this switch is off, blind handovers for CSFB are disabled. If both this option and the BlindHoSwitch option of the Handover Mode switch parameter of the CellHoParaCfg MO are selected, blind CSFB handovers for CSFB are enabled. LcsSrvccSwitch: If this switch is on, an SRVCC procedure is triggered when a UE receives a CSFB instruction during a VoIP service. If this switch is off, an SRVCC procedure is not triggered when a UE receives a CSFB instruction during a VoIP service. AutoGapSwitch: If this switch is on and UEs support automatic measurement gap configurations on the target frequency, the eNodeB does not deliver gap configurations to UEs. If this switch is off, the eNodeB delivers gap configurations to UEs during all inter-frequency and inter-RAT measurements. UeVoipOnHspaCapSwitch: If this switch is on and the eNodeB attempts to hand over UEs using voice services to UTRAN, the eNodeB checks UE capabilities when determining whether PS handover is applied. UEs must support voiceOverPS-HS-UTRAFDD-r9 if the target UTRAN cell works in FDD mode or voiceOverPS-HS-UTRA-TDD128-r9 if the target UTRAN cell works in TDD mode. If this switch is off, the eNodeB does not check UE capabilities when handing over UEs to UTRAN based on PS handovers. UtranFddB1CapSwitch: If this switch is on, the setting of bit 41 of FGI specifying the UE capability

Issue 02 (2016-04-20)

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228

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

of event B1 measurement on FDD UTRAN cells must be considered. If this switch is off, the setting of bit 41 of FGI does not need to be considered. CdmaHrpdNonOptMeaHoSwitch: If this switch is on, measurement-based non-optimized handovers to CDMA2000 HRPD are enabled. If this switch is off, measurement-based non-optimized handovers to CDMA2000 HRPD are disabled. GUI Value Range: UtranVoipCapSwitch(UtranVoipCapSwitch), Cdma1xRttVoipCapSwitch(Cdma1xRttVoipCapSwitc h), UtranPsHoSwitch(UtranPsHoSwitch), GeranPsHoSwitch(GeranPsHoSwitch), CdmaHrpdNonOptimisedHoSwitch(CdmaHrpdNonOptimisedHoSwitch), CdmaHrpdOptimisedHoSwitch(CdmaHrpdOptimisedHoSwitch), GeranNaccSwitch(GeranNaccSwitch), GeranCcoSwitch(GeranCcoSwitch), UtranSrvccSwitch(UtranSrvccSwitch), GeranSrvccSwitch(GeranSrvccSwitch), Cdma1xRttSrvccSwitch(Cdma1xRttSrvccSwitch), UtranRedirectSwitch(UtranRedirectSwitch), GeranRedirectSwitch(GeranRedirectSwitch), CdmaHrpdRedirectSwitch(CdmaHrpdRedirectSwitch), Cdma1xRttRedirectSwitch(Cdma1xRttRedirectSwitch ), BlindHoSwitch(BlindHoSwitch), LcsSrvccSwitch(LcsSrvccSwitch), AutoGapSwitch(AutoGapSwitch), UeVoipOnHspaCapSwitch(UeVoipOnHspaCapSwitch), UtranFddB1CapSwitch(UtranFddB1CapSwitch), CdmaHrpdNonOptMeaHoSwitch(CdmaHrpdNonOptMeaHoSwitch) Unit: None Actual Value Range: UtranVoipCapSwitch, Cdma1xRttVoipCapSwitch, UtranPsHoSwitch, GeranPsHoSwitch, CdmaHrpdNonOptimisedHoSwitch, CdmaHrpdOptimisedHoSwitch, GeranNaccSwitch, GeranCcoSwitch, UtranSrvccSwitch, GeranSrvccSwitch, Cdma1xRttSrvccSwitch, UtranRedirectSwitch, GeranRedirectSwitch, CdmaHrpdRedirectSwitch, Cdma1xRttRedirectSwitch, BlindHoSwitch, LcsSrvccSwitch, AutoGapSwitch, UeVoipOnHspaCapSwitch, UtranFddB1CapSwitch, CdmaHrpdNonOptMeaHoSwitch Issue 02 (2016-04-20)

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

Default Value: UtranVoipCapSwitch:Off, Cdma1xRttVoipCapSwitch:Off, UtranPsHoSwitch:Off, GeranPsHoSwitch:Off, CdmaHrpdNonOptimisedHoSwitch:Off, CdmaHrpdOptimisedHoSwitch:Off, GeranNaccSwitch:Off, GeranCcoSwitch:Off, UtranSrvccSwitch:Off, GeranSrvccSwitch:Off, Cdma1xRttSrvccSwitch:Off, UtranRedirectSwitch:Off, GeranRedirectSwitch:Off, CdmaHrpdRedirectSwitch:Off, Cdma1xRttRedirectSwitch:Off, BlindHoSwitch:Off, LcsSrvccSwitch:Off, AutoGapSwitch:Off, UeVoipOnHspaCapSwitch:Off, UtranFddB1CapSwitch:Off, CdmaHrpdNonOptMeaHoSwitch:Off CSFallB ackHo

BlindHo A1ThdR srp

MOD CSFAL LBACK HO LST CSFAL LBACK HO

LOFD-0 01052 / TDLOF D-00105 2

Flash CS Fallback to UTRAN

LOFD-0 01053 / TDLOF D-00105 3

Flash CS Fallback to GERAN

Meaning: Indicates the reference signal received power (RSRP) threshold for event A1 associated with CSFB-triggered adaptive blind handovers. This parameter is set for a UE as a triggering condition of event A1 measurement related to a CSFB-triggered adaptive blind handover. This parameter specifies the RSRP threshold of the serving cell above which a CSFB-triggered adaptive blind handover is triggered. If the RSRP value measured by a UE exceeds this threshold, the UE submits a measurement report related to event A1. GUI Value Range: -140~-43 Unit: dBm Actual Value Range: -140~-43 Default Value: -80

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranNF req

ConnFre qPriority

ADD UTRAN NFREQ

LOFD-0 01019 / TDLOF D-00101 9

PS InterRAT Mobility between EUTRAN and UTRAN

Meaning: Indicates the frequency priority based on which the eNodeB selects a target frequency for blind redirection or contains a frequency in a measurement configuration. If a blind redirection is triggered and the target neighboring cell is not specified, the eNodeB selects a target frequency based on this priority. If a measurement configuration is to be delivered, the eNodeB preferentially delivers a frequency with the highest priority. If this priority is set to 0 for a frequency, this frequency is not selected as the target frequency for a blind redirection. A larger value indicates a higher priority.

MOD UTRAN NFREQ LST UTRAN NFREQ

TDLBF D-00201 803 TDLOF D-00102 2 TDLOF D-00103 3 TDLOF D-00105 2 TDLOF D-00104 3 TDLOF D-00107 2 TDLOF D-00107 8

Cell Selectio n and Reselection SRVCC to UTRAN CS Fallback to UTRAN

GUI Value Range: 0~8 Unit: None Actual Value Range: 0~8 Default Value: 0

Flash CS Fallback to UTRAN Service based InterRAT handove r to UTRAN Distance based InterRAT handove r to UTRAN EUTRAN to UTRAN CS/PS steering

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

ENodeB AlgoSwi tch

NCellRa nkingSw itch

MOD ENODE BALGO SWITC H

LOFD-0 02002/ TDLOF D-00200 2

InterRAT ANR

LST ENODE BALGO SWITC H

LOFD-0 01022/ TDLOF D-00102 2

Meaning: Indicates whether to enable neighboring cell ranking. This parameter consists of the following switches: GERAN_SWITCH: Indicates whether the eNodeB prioritizes measurement priorities of neighboring GERAN cells based on the number of each neighboring GERAN cell is measured within a period of time. The eNodeB prioritizes measurement priorities only when this switch is on. UTRAN_SWITCH: Indicates whether the eNodeB prioritizes measurement priorities of neighboring UTRAN cells based on the number of each neighboring UTRAN cell is measured within a period of time. The eNodeB prioritizes measurement priorities of neighboring UTRAN cells based on the number of each neighboring UTRAN cell is measured within a period of time only when this switch is on.

CS Fallback to UTRAN

LOFD-0 01033/ TDLOF D-00103 3

Flash CS Fallback to UTRAN

LOFD-0 01052/ TDLOF D-00105 2

Flash CS Fallback to GERAN

GUI Value Range: GERAN_SWITCH(GERAN Neighboring Cell Ranking Switch), UTRAN_SWITCH(UTRAN Neighboring Cell Ranking Switch)

LOFD-0 01053/ TDLOF D-00105 3

PS InterRAT Mobility between EUTRAN and UTRAN

Actual Value Range: GERAN_SWITCH, UTRAN_SWITCH

LOFD-0 01019/ TDLOF D-00101 9 LOFD-0 01043/ TDLOF D-00104 3 LOFD-0 01072/ TDLOF D-00107 2

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SRVCC to UTRAN

Unit: None

Default Value: GERAN_SWITCH:Off, UTRAN_SWITCH:Off

Service based interRAT handove r to UTRAN Distance based interRAT handove r to UTRAN

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranN Cell

NCellM easPriori ty

ADD UTRAN NCELL

LOFD-0 02002/ TDLOF D-00200 2

InterRAT ANR

Meaning: Indicates the measurement priority of the neighboring UTRAN cell. A larger value indicates a higher priority. The measurement priorities can be periodically and automatically arranged based on the number of times that each neighboring UTRAN cell is measured. The neighboring UTRAN cells for UTRAN measurement control, UTRAN flash blind redirections, and UTRAN flash-CSFB-based redirections can be selected based on the measurement priorities of neighboring UTRAN cells.

DSP UTRAN EXTEN DEDNC ELL LST UTRAN NCELL

LOFD-0 01022/ TDLOF D-00102 2

CS Fallback to UTRAN

LOFD-0 01033/ TDLOF D-00103 3

Flash CS Fallback to UTRAN

LOFD-0 01052/ TDLOF D-00105 2

PS InterRAT Mobility between EUTRAN and UTRAN

LOFD-0 01019/ TDLOF D-00101 9 LOFD-0 01043/ TDLOF D-00104 3 LOFD-0 01072/ TDLOF D-00107 2

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SRVCC to UTRAN

GUI Value Range: 0~128 Unit: None Actual Value Range: 0~128 Default Value: 0

Service based interRAT handove r to UTRAN Distance based interRAT handove r to UTRAN

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranN Cell

CellMea sPriority

ADD UTRAN NCELL

LOFD-0 01019

PS InterRAT Mobility between EUTRAN and UTRAN

Meaning: Indicates the priority of measurement on the neighboring UTRAN cell. The eNodeB preferentially contains the information about a neighboring cell with this priority set to HIGH_PRIORITY while delivering a measurement configuration.

MOD UTRAN NCELL LST UTRAN NCELL

TDLOF D-00102 2 TDLOF D-00103 3 TDLOF D-00105 2 TDLOF D-00101 9 TDLOF D-00104 3 TDLOF D-00107 2 TDLOF D-00107 8

SRVCC to UTRAN CS Fallback to UTRAN

GUI Value Range: LOW_PRIORITY(Low Priority), HIGH_PRIORITY(High Priority) Unit: None Actual Value Range: LOW_PRIORITY, HIGH_PRIORITY Default Value: LOW_PRIORITY(Low Priority)

Flash CS Fallback to UTRAN PS InterRAT Mobility between EUTRAN and UTRAN Service based InterRAT handove r to UTRAN Distance based InterRAT handove r to UTRAN EUTRAN to UTRAN

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

CS/PS steering CellUe MeasCo ntrolCfg

MaxUtr anTddM easFreq Num

MOD CELLU EMEAS CONTR OLCFG

LOFD-0 01019 / TDLOF D-00101 9

LST CELLU EMEAS CONTR OLCFG

LOFD-0 01022 / TDLOF D-00102 2 LOFD-0 01043 / TDLOF D-00104 3 LOFD-0 01072 / TDLOF D-00107 2 LOFD-0 01033 / TDLOF D-00103 3

PS InterRAT Mobility between EUTRAN and UTRAN

Meaning: Indicates the maximum number of UTRAN TDD frequencies that can be contained in the measurement control messages delivered for UEs in RRC_CONNECTED state.

SRVCC to UTRAN

Default Value: 3

GUI Value Range: 1~16 Unit: None Actual Value Range: 1~16

Service based InterRAT handove r to UTRAN Distance based InterRAT handove r to UTRAN CS Fallback to UTRAN

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranN Cell

BlindHo Priority

ADD UTRAN NCELL

LOFD-0 01019

PS InterRAT Mobility between EUTRAN and UTRAN

Meaning: Indicates the priority of the neighboring cell during blind handovers. Blind handover is a process in which the eNodeB instructs a UE to hand over to a specified neighboring cell. There are 32 priorities altogether. The priority has a positive correlation with the value of this parameter. Note that the value 0 indicates that blind handovers to the neighboring cell are not allowed.

SRVCC to UTRAN

GUI Value Range: 0~32

MOD UTRAN NCELL LST UTRAN NCELL

TDLOF D-00102 2 TDLOF D-00103 3 TDLOF D-00105 2 TDLOF D-00101 9 TDLOF D-00104 3 TDLOF D-00107 2 TDLOF D-00107 8

CS Fallback to UTRAN

Unit: None Actual Value Range: 0~32 Default Value: 0

Flash CS Fallback to UTRAN PS InterRAT Mobility between EUTRAN and UTRAN Service based InterRAT handove r to UTRAN Distance based InterRAT handove r to UTRAN EUTRAN to UTRAN

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

CS/PS steering CellHoP araCfg

L2UCsf bMRPro Mode

MOD CELLH OPARA CFG LST CELLH OPARA CFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates how measurement reports are handled in measurement-based CSFB to UTRAN. If this parameter is set to HANDOVER_IMMEDIATELY, an eNodeB immediately performs handover evaluation after receiving a measurement report for CSFB to UTRAN. If this parameter is set to BASED_ON_SIGNAL_STRENGTH, the eNodeB transfers the UE to the strongest cell. If this parameter is set to BASED_ON_FREQ_PRIORITY, the eNodeB hands over the UE to a cell on a frequency with a priority as high as possible. GUI Value Range: HANDOVER_IMMEDIATELY(HANDOVER_IMM EDIATELY), BASED_ON_SIGNAL_STRENGTH(BASED_ON_S IGNAL_STRENGTH), BASED_ON_FREQ_PRIORITY(BASED_ON_FRE Q_PRIORITY) Unit: None Actual Value Range: HANDOVER_IMMEDIATELY, BASED_ON_SIGNAL_STRENGTH, BASED_ON_FREQ_PRIORITY Default Value: HANDOVER_IMMEDIATELY(HANDOVER_IMM EDIATELY)

CellHoP araCfg

CsfbMR Waiting Timer

MOD CELLH OPARA CFG LST CELLH OPARA CFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the length of the timer that the eNodeB waits for the next measurement report after receiving the first measurement report for measurement-based CSFB to UTRAN. GUI Value Range: 60~1000 Unit: ms Actual Value Range: 60~1000 Default Value: 100

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

InterRat HoCom m

CellInfo MaxUtr anCellN um

MOD INTER RATHO COMM

LOFD-0 01019 / TDLOF D-00101 9

PS InterRAT Mobility between EUTRAN and UTRAN

Meaning: Indicates the maximum number of UTRAN cell system information messages that can be transmitted during a flash redirection procedure.

LST INTER RATHO COMM

TDLOF D-00105 2

GUI Value Range: 1~16 Unit: None Actual Value Range: 1~16 Default Value: 8

Flash CS Fallback to UTRAN CSFallB ackHo

CsfbProt ectionTi mer

MOD CSFAL LBACK HO LST CSFAL LBACK HO

LOFD-0 01033 / TDLOF D-00103 3 LOFD-0 01033 / TDLOF D-00103 4 LOFD-0 01033 / TDLOF D-00109 0

InterRat HoCom m

UtranCe llNumF orEmcR edirect

MOD INTER RATHO COMM LST INTER RATHO COMM

Issue 02 (2016-04-20)

LOFD-0 01033 / TDLOF D-00103 3 TDLOF D-00105 2

CS Fallback to UTRAN

Meaning: Indicates the timer governing the period in which only CSFB can be performed . After the timer expires, the eNodeB performs a blind redirection for the UE.

CS Fallback to GERAN

GUI Value Range: 1~10

Enhance d CS Fallback to CDMA2 000 1xRTT

Default Value: 4

CS Fallback to UTRAN

Meaning: Indicates the maximum number of UTRAN cell system information messages that can be transmitted during a CSFB emergency redirection procedure.

Flash CS Fallback to UTRAN

GUI Value Range: 0~16

Unit: s Actual Value Range: 1~10

Unit: None Actual Value Range: 0~16 Default Value: 0

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

GlobalP rocSwitc h

Protocol MsgOpt Switch

MOD GLOBA LPROC SWITC H

LOFD-0 01022/ TDLOF D-00102 2

SRVCC to UTRAN

Meaning:

LST GLOBA LPROC SWITC H

LOFD-0 01023/ TDLOF D-00102 3

SRVCC to GERAN UltraFlash CSFB to GERAN

LOFD-0 81283/ TDLOF D-08120 3

Flash CS Fallback to GERAN

LOFD-0 01053/ TDLOF D-00105 3

PS InterRAT Mobility between EUTRAN and GERAN

LOFD-0 01020/ TDLOF D-00102 0

Indicates whether to optimize protocol messages sent by the eNodeB. This parameter includes the following options: RrcSetupOptSwitch: If this option is selected, the optimization of RRCConnectionSetup messages is enabled. In this case, IEs with protocol-defined default values are no longer included in the RRCConnectionSetup message. For details about the protocol-defined default settings, see 3GPP TS 36.331. IucsRrcRecfgMcCombSwitch: If this option is selected, the eNodeB includes the radio resource configuration and measurement configuration for a UE in one RRCConnectionReconfiguration message during initial access. RcrpRrcRecfgMcCombSwitch: If this option is selected, the eNodeB includes the radio resource configuration and measurement configuration for a UE in one RRCConnectionReconfiguration message during RRC connection reestablishment. The option will not take effect on the interaction of RRC connection reestablishment and other signaling procedures. RrcRecfgMcOptSwitch: If this option is selected, the cell measurement configurations with the CIO of 0 (indicated by cellIndividualOffset) are no longer included in the measurement configurations delivered to UEs. IdleCsfbRedirectOptSwitch: If this option is selected and the preferred CSFB policy for UEs in idle mode is redirection, the eNodeB no longer activates security mode or performs RRC connection reconfiguration, but sends a redirection message. UlNasBufferSwitch: If this option is selected, the eNodeB buffers uplink NAS messages sent by the UE before the UE-associated logical S1 connection is available and sends these messages after the UEassociated logical S1 connection is available. If this option is deselected, the eNodeB releases this UE after the procedures finish. IratMeasCfgTransSwitch: If this option is selected, the Handover Required message that the eNodeB sends to

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

a BSC contains the IE IRAT Measurement Configuration. GeranAnrMcOptSwitch: This option controls whether measurement configuration optimization takes effect when ANR with GERAN is enabled. If this option is deselected, the optimization does not take effect. That is, when an eNodeB delivers measurement configuration to UEs to perform CGI reading for ANR with GERAN, the carrierFreqs IE can contain multiple GERAN frequencies. If this option is selected, the optimization takes effect, and the carrierFreqs IE contains only one GERAN frequency. InactDiscardSwitch: This option specifies whether to terminate the ongoing signaling flow when the UE inactivity timer expires. If this option is deselected, the ongoing flow is terminated and the eNodeB directly releases the UE. If this option is selected, the ongoing flow is not terminated and the timer is restarted. SRVCCHoBasedUeCapSwitch: If this option is selected, the eNodeB determines whether to trigger an SRVCC based only on UE's SRVCC capabilities, not the SRVCCOperationPossible IE that the MME sends to the eNodeB. If this option is deselected, the eNodeB determines whether to trigger an SRVCCbased handover based on the SRVCCOperationPossible IE that the MME sends to the eNodeB. L2GPLMNChooseOptSwitch: This option specifies whether to enable target PLMN ID optimization for handovers to GERAN. If this option is selected, the eNodeB takes the NCL-defined PLMN IDs and includes them in the handover request messages or RIM request messages. If this option is deselected, the optimization is not activated. HoInRrcRecfgMcCombSwitch: If this option is selected, after a UE is handed over to a cell, the cell delivers the radio resource configuration and measurement configuration in a single RRC Connection Reconfiguration message to the UE during the resource reconfiguration procedure. GUI Value Range: RrcSetupOptSwitch, IucsRrcRecfgMcCombSwitch, RcrpRrcRecfgMcCombSwitch, RrcRecfgMcOptSwitch, IdleCsfbRedirectOptSwitch, UlNasBufferSwitch, IratMeasCfgTransSwitch,

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

GeranAnrMcOptSwitch, InactDiscardSwitch, SRVCCHoBasedUeCapSwitch, L2GPLMNChooseOptSwitch, HoInRrcRecfgMcCombSwitch, UeCapEnquiryCombSwitch, UeTraceOptSwitch Unit: None Actual Value Range: RrcSetupOptSwitch, IucsRrcRecfgMcCombSwitch, RcrpRrcRecfgMcCombSwitch, RrcRecfgMcOptSwitch, IdleCsfbRedirectOptSwitch, UlNasBufferSwitch, IratMeasCfgTransSwitch, GeranAnrMcOptSwitch, InactDiscardSwitch, SRVCCHoBasedUeCapSwitch, L2GPLMNChooseOptSwitch, HoInRrcRecfgMcCombSwitch, UeCapEnquiryCombSwitch, UeTraceOptSwitch Default Value: RrcSetupOptSwitch:Off, IucsRrcRecfgMcCombSwitch:Off, RcrpRrcRecfgMcCombSwitch:Off, RrcRecfgMcOptSwitch:Off, IdleCsfbRedirectOptSwitch:Off, UlNasBufferSwitch:Off, IratMeasCfgTransSwitch:Off, GeranAnrMcOptSwitch:Off, InactDiscardSwitch:Off, SRVCCHoBasedUeCapSwitch:Off, L2GPLMNChooseOptSwitch:Off, HoInRrcRecfgMcCombSwitch:Off, UeCapEnquiryCombSwitch:Off, UeTraceOptSwitch:Off

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

eNBRsv dPara

RsvdSw Para1

MOD ENBRS VDPAR A

None

Meaning:

LST ENBRS VDPAR A

Indicates reserved 32-bit switch parameter 1 that is reserved for future requirements. Note on parameter replacement: Reserved parameters are temporarily used in patch versions and will be replaced with new parameters. For example, the ID of a new parameter can signify the parameter function. Therefore, avoid using this parameter. GUI Value Range: RsvdSwPara1_bit1(ReservedSwitchParameter1_bit1), RsvdSwPara1_bit2(ReservedSwitchParameter1_bit2), RsvdSwPara1_bit3(ReservedSwitchParameter1_bit3), RsvdSwPara1_bit4(ReservedSwitchParameter1_bit4), RsvdSwPara1_bit5(ReservedSwitchParameter1_bit5), RsvdSwPara1_bit6(ReservedSwitchParameter1_bit6), RsvdSwPara1_bit7(ReservedSwitchParameter1_bit7), RsvdSwPara1_bit8(ReservedSwitchParameter1_bit8), RsvdSwPara1_bit9(ReservedSwitchParameter1_bit9), RsvdSwPara1_bit10(ReservedSwitchParameter1_bit10), RsvdSwPara1_bit11(ReservedSwitchParameter1_bit11), RsvdSwPara1_bit12(ReservedSwitchParameter1_bit12), RsvdSwPara1_bit13(ReservedSwitchParameter1_bit13), RsvdSwPara1_bit14(ReservedSwitchParameter1_bit14), RsvdSwPara1_bit15(ReservedSwitchParameter1_bit15), RsvdSwPara1_bit16(ReservedSwitchParameter1_bit16), RsvdSwPara1_bit17(ReservedSwitchParameter1_bit17), RsvdSwPara1_bit18(ReservedSwitchParameter1_bit18), RsvdSwPara1_bit19(ReservedSwitchParameter1_bit19), RsvdSwPara1_bit20(ReservedSwitchParameter1_bit20), RsvdSwPara1_bit21(ReservedSwitchParameter1_bit21), RsvdSwPara1_bit22(ReservedSwitchParameter1_bit22), RsvdSwPara1_bit23(ReservedSwitchParameter1_bit23), RsvdSwPara1_bit24(ReservedSwitchParame-

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Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

ter1_bit24), RsvdSwPara1_bit25(ReservedSwitchParameter1_bit25), RsvdSwPara1_bit26(ReservedSwitchParameter1_bit26), RsvdSwPara1_bit27(ReservedSwitchParameter1_bit27), RsvdSwPara1_bit28(ReservedSwitchParameter1_bit28), RsvdSwPara1_bit29(ReservedSwitchParameter1_bit29), RsvdSwPara1_bit30(ReservedSwitchParameter1_bit30), RsvdSwPara1_bit31(ReservedSwitchParameter1_bit31), RsvdSwPara1_bit32(ReservedSwitchParameter1_bit32) Unit: None Actual Value Range: RsvdSwPara1_bit1, RsvdSwPara1_bit2, RsvdSwPara1_bit3, RsvdSwPara1_bit4, RsvdSwPara1_bit5, RsvdSwPara1_bit6, RsvdSwPara1_bit7, RsvdSwPara1_bit8, RsvdSwPara1_bit9, RsvdSwPara1_bit10, RsvdSwPara1_bit11, RsvdSwPara1_bit12, RsvdSwPara1_bit13, RsvdSwPara1_bit14, RsvdSwPara1_bit15, RsvdSwPara1_bit16, RsvdSwPara1_bit17, RsvdSwPara1_bit18, RsvdSwPara1_bit19, RsvdSwPara1_bit20, RsvdSwPara1_bit21, RsvdSwPara1_bit22, RsvdSwPara1_bit23, RsvdSwPara1_bit24, RsvdSwPara1_bit25, RsvdSwPara1_bit26, RsvdSwPara1_bit27, RsvdSwPara1_bit28, RsvdSwPara1_bit29, RsvdSwPara1_bit30, RsvdSwPara1_bit31, RsvdSwPara1_bit32 Default Value: RsvdSwPara1_bit1:Off, RsvdSwPara1_bit2:Off, RsvdSwPara1_bit3:Off, RsvdSwPara1_bit4:Off, RsvdSwPara1_bit5:Off, RsvdSwPara1_bit6:Off, RsvdSwPara1_bit7:Off, RsvdSwPara1_bit8:Off, RsvdSwPara1_bit9:Off, RsvdSwPara1_bit10:Off, RsvdSwPara1_bit11:Off, RsvdSwPara1_bit12:Off, RsvdSwPara1_bit13:Off, RsvdSwPara1_bit14:Off, RsvdSwPara1_bit15:Off, RsvdSwPara1_bit16:Off, RsvdSwPara1_bit17:Off, RsvdSwPara1_bit18:Off, RsvdSwPara1_bit19:Off, RsvdSwPara1_bit20:Off, RsvdSwPara1_bit21:Off, RsvdSwPara1_bit22:Off, RsvdSwPara1_bit23:Off, RsvdSwPara1_bit24:Off, RsvdSwPara1_bit25:Off, Issue 02 (2016-04-20)

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eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

RsvdSwPara1_bit26:Off, RsvdSwPara1_bit27:Off, RsvdSwPara1_bit28:Off, RsvdSwPara1_bit29:Off, RsvdSwPara1_bit30:Off, RsvdSwPara1_bit31:Off, RsvdSwPara1_bit32:Off CSFallB ackPolic yCfg

CsfbUse rArpCfg Switch

MOD CSFAL LBACK POLIC YCFG

LBFD-0 02023 / TDLBF D-00202 3

Admissi on Control

GUI Value Range: OFF(Off), ON(On)

LST CSFAL LBACK POLIC YCFG CSFallB ackPolic yCfg

Normal CsfbUse rArp

MOD CSFAL LBACK POLIC YCFG

Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off) LBFD-0 02023 / TDLBF D-00202 3

Admissi on Control

LST CSFAL LBACK POLIC YCFG GlobalP rocSwitc h

UtranLo adTrans Chan

MOD GLOBA LPROC SWITC H LST GLOBA LPROC SWITC H

Meaning: Indicates whether allocation/retention priorities (ARPs) can be configured for CSFB services triggered by common calls. For details about ARPs, see 3GPP TS 23.401.

Meaning: Indicates the allocation/retention priority (ARP) of a CSFB service triggered by a common call. When this parameter is set to 1, the service priority is the same as that of an emergency call. For details about the ARP, see 3GPP TS 23.401. GUI Value Range: 1~15 Unit: None Actual Value Range: 1~15 Default Value: 2

None

Meaning: Indicates the UMTS load transmission channel. The eNodeB sends RAN-INFORMATIONREQUEST PDUs to UTRAN cells to request multiple reports on the load status of UTRAN cells only when the parameter is set to BASED_ON_RIM.The function specified by the parameter value BASED_ON_ECO is temporarily unavailable. GUI Value Range: NULL, BASED_ON_RIM, BASED_ON_ECO Unit: None Actual Value Range: NULL, BASED_ON_RIM, BASED_ON_ECO Default Value: NULL

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

ENodeB AlgoSwi tch

RimOnE coSwitc h

MOD ENODE BALGO SWITC H

MRFD090211 LOFD-0 01052/ TDLOF D-00105 2

eCoordi nator based RIM process optimiza tion

Meaning: Indicates whether the RAN information management (RIM) procedure is initiated by the eCoordinator. If this parameter is set to ON, the RIM procedure is initiated by the eCoordinator. If this parameter is set to OFF, the RIM procedure is initiated by the core network.

LOFD-0 01019/ TDLOF D-00101 9

Flash CS Fallback to UTRAN

Unit: None

LOFD-0 01044/ TDLOF D-00104 4

PS InterRAT Mobility between EUTRAN and UTRAN

LST ENODE BALGO SWITC H

LOFD-0 01033/ TDLOF D-00103 3

GUI Value Range: OFF(Off), ON(On) Actual Value Range: OFF, ON Default Value: OFF(Off)

InterRAT Load Sharing to UTRA N(based on UMTS cell load informat ion) CS Fallback to UTRAN

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245

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

ENodeB AlgoSwi tch

RimSwit ch

MOD ENODE BALGO SWITC H

LOFD-0 01034 / TDLOF D-00103 4

CS Fallback to GERAN

LST ENODE BALGO SWITC H

LOFD-0 01052 / TDLOF D-00105 2

Meaning: Indicates the collective switch for the RAN information management (RIM) function. UTRAN_RIM_SWITCH: Indicates the switch used to enable or disable the RIM procedure that requests event-driven multiple reports from UTRAN cells. If this switch is on, the eNodeB can send RANINFORMATION-REQUEST protocol data units (PDUs) to UTRAN cells to request multiple eventdriven reports. If this switch is off, the eNodeB cannot send RAN-INFORMATION-REQUEST PDUs to UTRAN cells to request multiple event-driven reports. GERAN_RIM_SWITCH: Indicates the switch used to enable or disable the RIM procedure that requests event-driven multiple reports from GERAN cells. If this switch is on, the eNodeB can send RANINFORMATION-REQUEST PDUs to CERAN cells to request multiple event-driven reports. If this switch is off, the eNodeB cannot send RANINFORMATION-REQUEST PDUs to GERAN cells to request multiple event-driven reports.

LOFD-0 01053 / TDLOF D-00105 3

Flash CS Fallback to UTRAN Flash CS Fallback to GERAN

GUI Value Range: UTRAN_RIM_SWITCH(UTRAN RIM Switch), GERAN_RIM_SWITCH(GERAN RIM Switch) Unit: None Actual Value Range: UTRAN_RIM_SWITCH, GERAN_RIM_SWITCH Default Value: UTRAN_RIM_SWITCH:Off, GERAN_RIM_SWITCH:Off

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246

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

ENodeB AlgoSwi tch

MultiOp CtrlSwit ch

MOD ENODE BALGO SWITC H

LOFD-0 01022

SRVCC to UTRAN

Meaning: Indicates the switch used to control whether operators can adopt different policies. This parameter is a bit-filed-type parameter. By specifying the bit fields under this parameter, operators can adopt different policies on the corresponding RAT. This parameter applies only to LTE FDD. UtranSepOpMobilitySwitch is a switch used to control whether operators can adopt different mobility policies on their UTRANs. If this switch is on, operators can adopt different policies (such as PS handover capability and RIM-based system information reading capability) on their UTRANs. If this switch is off, operators cannot adopt different policies on their UTRANs.

LST ENODE BALGO SWITC H

LOFD-0 01087 LOFD-0 01033 LOFD-0 01052 LOFD-0 01068 LOFD-0 01088 LOFD-0 01019 LOFD-0 01043 LOFD-0 01072 LOFD-0 01078

SRVCC Flexible Steering to UTRAN CS Fallback to UTRAN Flash CS Fallback to UTRAN CS Fallback with LAI to UTRAN

GUI Value Range: UtranSepOpMobilitySwitch(UtranSepOpMobilitySwitch) Unit: None Actual Value Range: UtranSepOpMobilitySwitch Default Value: UtranSepOpMobilitySwitch:Off

CS Fallback Steering to UTRAN PS InterRAT Mobility between EUTRAN and UTRAN Service based interRAT Distance based InterRAT handove r to UTRAN Issue 02 (2016-04-20)

247

eRAN TDD CS Fallback Feature Parameter Description

Parame ter ID

MML Comma nd

Feature ID

9 Parameters

Feature Name

Description

EUTRAN to UTRAN CS/PS Steering

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248

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranNe tworkCa pCfg

Network CapCfg

ADD UTRAN NETW ORKCA PCFG

LOFD-0 01022 / TDLOF D-00102 2

SRVCC to UTRAN

Meaning:

MOD UTRAN NETW ORKCA PCFG

LOFD-0 01033 / TDLOF D-00103 3

LST UTRAN NETW ORKCA PCFG

LOFD-0 01052 / TDLOF D-00105 2 LOFD-0 01068 / TDLOF D-00106 8 LOFD-0 01088 / TDLOF D-00108 8 LOFD-0 01019 / TDLOF D-00101 9 LOFD-0 01043 / TDLOF D-00104 3 LOFD-0 01072 / TDLOF D-00107 2 LOFD-0 81283 / TDLOF D-08120 3

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CS Fallback to UTRAN Flash CS Fallback to UTRAN CS Fallback with LAI to UTRAN CS Fallback Steering to UTRAN PS InterRAT Mobility between EUTRAN and UTRAN Service based interRAT handove r to UTRAN Distance based InterRAT handove r to UTRAN UltraFlash

Indicates the UTRAN capabilities for an operator including the PS handover capability, capability of obtaining system information (SI) of the UTRAN through RAN information management (RIM) procedures, VoIP capability, ultra-flash CSFB capability, and SRVCC capability. If the MME, SGSN, MSC, or RNC of the operator does not support PS handover, RIM procedures, VoIP, ultra-flash CSFB, or SRVCC, set this parameter to indicate the incapabilities. If this parameter is not set, UTRAN capabilities are supported by default. This parameter applies only to LTE FDD. PsHoCapCfg: Indicates whether PS handover is supported by the operator in the UTRAN. This capability is supported only if this option is selected. SiByRimCapCfg: Indicates whether SI of the UTRAN can be obtained through RIM procedures. This capability is supported only if this option is selected. VoipCapCfg: Indicates whether VoIP is supported by the operator in the UTRAN. Only if this option is selected, this capability is supported and the eNodeB can transfer voice services to the UTRAN through PS handover to establish VoIP services. UltraFlashCsfbCapCfg: Indicates whether SRVCCbased CSFB is supported by the operator in the UTRAN. This capability is supported only if this option is selected. SrvccCapCfg: Indicates whether SRVCC is supported by the operator in the UTRAN. This capability is supported only if this option is selected. Using SRVCC, voice services can be handed over to the UTRAN. GUI Value Range: PsHoCapCfg(PsHoCapCfg), SiByRimCapCfg(SiByRimCapCfg), VoipCapCfg(VoipCapCfg), UltraFlashCsfbCapCfg(UltraFlashCsfbCapCfg), SrvccCapCfg(SrvccCapCfg) Unit: None Actual Value Range: PsHoCapCfg, SiByRimCapCfg, VoipCapCfg, UltraFlashCsfbCapCfg, SrvccCapCfg Default Value: PsHoCapCfg:Off, SiByRimCapCfg:Off, VoipCapCfg:On, UltraFlashCsfbCapCfg:Off, SrvccCapCfg:On

249

eRAN TDD CS Fallback Feature Parameter Description

GeranNf reqGrou p

Parame ter ID

ConnFre qPriority

MML Comma nd

ADD GERAN NFREQ GROUP MOD GERAN NFREQ GROUP LST GERAN NFREQ GROUP

9 Parameters

Feature ID

Feature Name

LOFD-0 70202 / TDLOF D-08122 3

CSFB to GERAN

LOFD-0 01020 / TDLOF D-00102 0 TDLOF D-00102 3

PS InterRAT Mobility between EUTRAN and GERAN

TDLOF D-00103 4

SRVCC to GERAN

TDLOF D-00105 3

CS Fallback to GERAN

UltraFlash CSFB to UTRAN

Flash CS Fallback to GERAN

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Description

Meaning: Indicates the frequency group priority based on which the eNodeB selects a target frequency group for blind redirection or delivers a frequency group in measurement configuration messages. If a blind redirection is triggered and the target neighboring cell is not specified, the eNodeB selects a target frequency group based on the setting of this parameter. If a measurement configuration is to be delivered, the eNodeB preferentially delivers the frequency group with the highest priority. If this parameter is set to 0 for a frequency group, this frequency group is not selected as the target frequency group for a blind redirection. A larger value indicates a higher priority. GUI Value Range: 0~8 Unit: None Actual Value Range: 0~8 Default Value: 0

250

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

GeranN cell

BlindHo Priority

ADD GERAN NCELL

LOFD-0 01020 / TDLOF D-00102 0 TDLOF D-00102 3

PS InterRAT Mobility between EUTRAN and GERAN

TDLOF D-00103 4

SRVCC to GERAN

GUI Value Range: 0~32

TDLOF D-00105 3

CS Fallback to GERAN

MOD GERAN NCELL LST GERAN NCELL

Unit: None Actual Value Range: 0~32 Default Value: 0

Flash CS Fallback to GERAN InterRat HoCom m

CellInfo MaxGer anCellN um

MOD INTER RATHO COMM LST INTER RATHO COMM

LOFD-0 01020 / TDLOF D-00102 0 TDLOF D-00105 3

PS InterRAT Mobility between EUTRAN and GERAN

Meaning: Indicates the maximum number of GERAN cell system information messages that can be transmitted during a flash redirection procedure. GUI Value Range: 1~32 Unit: None Actual Value Range: 1~32 Default Value: 8

Flash CS Fallback to GERAN

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251

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

GeranEx ternalCe ll

UltraFla shCsfbI nd

ADD GERAN EXTER NALCE LL

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CSFB to GERAN

Meaning: Indicates whether an external GERAN cell supports ultra-flash CSFB to GERAN. If this parameter is set to BOOLEAN_TRUE, the external GERAN cell supports ultra-flash CSFB to GERAN. If this parameter is set to BOOLEAN_FALSE, the external GERAN cell does not support ultra-flash CSFB to GERAN.

MOD GERAN EXTER NALCE LL

GUI Value Range: BOOLEAN_FALSE(False), BOOLEAN_TRUE(True) Unit: None

LST GERAN EXTER NALCE LL CellDrx Para

DrxFor MeasSw itch

MOD CELLD RXPAR A LST CELLD RXPAR A

Actual Value Range: BOOLEAN_FALSE, BOOLEAN_TRUE Default Value: BOOLEAN_TRUE(True)

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates whether to deliver measurementdedicated DRX parameters to a UE when GERAN measurements are triggered for CSFB of the UE. If this parameter is set to ON, the eNodeB delivers both DRX parameters and gap-assisted GERAN measurement configurations to the UE. If this parameter is set to OFF, the eNodeB delivers only gap-assisted GERAN measurement configurations to the UE. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off)

InterRat HoCom m

GeranCe llNumF orEmcR edirect

MOD INTER RATHO COMM LST INTER RATHO COMM

LOFD-0 01034 / TDLOF D-00103 4

CS Fallback to GERAN

Meaning: Indicates the maximum number of GERAN cell system information messages that can be transmitted during a CSFB emergency redirection procedure. GUI Value Range: 0~32 Unit: None Actual Value Range: 0~32 Default Value: 0

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252

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

UtranEx ternalCe ll

Rac

ADD UTRAN EXTER NALCE LL

LOFD-0 01019 / TDLOF D-00101 9

Meaning: Indicates the routing area code.

MOD UTRAN EXTER NALCE LL

LOFD-0 01034 / TDLOF D-00103 4

PS InterRAT Mobility between EUTRAN and UTRAN

LST UTRAN EXTER NALCE LL

LOFD-0 01052 / TDLOF D-00105 2 TDLOF D-00103 3 TDLOF D-00104 3 TDLOF D-00107 2 TDLOF D-00107 8

GUI Value Range: 0~255 Unit: None Actual Value Range: 0~255 Default Value: 0

CS Fallback to GERAN Flash CS Fallback to UTRAN CS Fallback to UTRAN Service based InterRAT handove r to UTRAN Distance based InterRAT handove r to UTRAN EUTRAN to UTRAN CS/PS steering

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253

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellOp HoCfg

CnOper atorId

ADD CELLO PHOCF G

None

Meaning: Indicates the index of the operator. GUI Value Range: 0~5 Unit: None Actual Value Range: 0~5

LST CELLO PHOCF G

Default Value: None

MOD CELLO PHOCF G RMV CELLO PHOCF G CSFallB ackBlin dHoCfg

UtranLc sCap

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

GUI Value Range: OFF(Off), ON(On)

LST CSFAL LBACK BLIND HOCFG CellOp HoCfg

LocalCe llId

ADD CELLO PHOCF G LST CELLO PHOCF G

Meaning: Indicates the LCS capability of the UTRAN. If this parameter is set to ON, the UTRAN supports LCS. If this parameter is set to OFF, the UTRAN does not support LCS. Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off)

None

Meaning: Indicates the local identity of the cell. It uniquely identifies a cell within an eNodeB. GUI Value Range: 0~255 Unit: None Actual Value Range: 0~255 Default Value: None

MOD CELLO PHOCF G RMV CELLO PHOCF G

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254

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

UtranCs fbBlind RedirRr Sw

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01033/ TDLOF D-00103 3

CS Fallback to UTRAN

LST CSFAL LBACK BLIND HOCFG

LOFD-0 01052/ TDLOF D-00105 2

Meaning: Indicates whether the eNodeB selects the target frequency in a round robin (RR) manner from frequencies with the same priority in blind redirections for CSFB to UTRAN. If this parameter is set to ON(On), the function of target frequency selection in an RR manner is enabled. If this parameter is set to OFF(Off), this function is disabled.

Flash CS Fallback to UTRAN

GUI Value Range: OFF(OFF), ON(ON) Unit: None Actual Value Range: OFF, ON Default Value: OFF(OFF)

GlobalP rocSwitc h

CsfbFlo wOptSw itch

MOD GLOBA LPROC SWITC H

LOFD-0 01033/ TDLOF D-00103 3

LST GLOBA LPROC SWITC H

LOFD-0 01052/ TDLOF D-00105 2 LOFD-0 70202/ TDLOF D-08122 3

CS Fallback to UTRAN Flash CS Fallback to UTRAN UltraFlash CSFB to UTRAN

Meaning: Indicates whether to enable CSFB procedure optimization. This parameter provides the following option: UTRAN_CSFB_FREQ_CHOOSE_OPT_SW: This option specifies whether to optimize target frequency selection for CSFB to UTRAN if there are several target frequencies with the same priority. If this option is selected, a UE selects the target frequency randomly. If this option is deselected, this optimization function is disabled. GUI Value Range: UTRAN_CSFB_FREQ_CHOOSE_OPT_SW(UTRA N CSFB Freq Choose Opt Sw) Unit: None Actual Value Range: UTRAN_CSFB_FREQ_CHOOSE_OPT_SW Default Value: UTRAN_CSFB_FREQ_CHOOSE_OPT_SW:Off

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CnOper ator

CnOper atorId

ADD CNOPE RATOR

LOFD-0 01036

RAN Sharing with Commo n Carrier

Meaning: Indicates the index of the operator.

LST CNOPE RATOR

LOFD-0 01037 LOFD-0 01086

MOD CNOPE RATOR

TDLOF D-00111 2

RMV CNOPE RATOR

LOFD-0 70206

GUI Value Range: 0~5 Unit: None Actual Value Range: 0~5 Default Value: None

RAN Sharing with Dedicate d Carrier RAN Sharing by More Operator s MOCN Flexible Priority Based Campin g Hybrid RAN Sharing

CSFallB ackHo

LocalCe llId

LST CSFAL LBACK HO MOD CSFAL LBACK HO

Issue 02 (2016-04-20)

None

Meaning: Indicates the local ID of the cell. It uniquely identifies a cell within a BS. GUI Value Range: 0~255 Unit: None Actual Value Range: 0~255 Default Value: None

256

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

S1Interf ace

MmeRel ease

ADD S1INTE RFACE

LBFD-0 0300101 / TDLBF D-00300 101

Star Topolog y

LBFD-0 0300102 / TDLBF D-00300 102

Tree Topolog y

Meaning: Indicates the compliance protocol release of the MME to which the eNodeB is connected through the S1 interface. The eNodeB sends S1 messages complying with the protocol release specified by this parameter. The value of this parameter must be the same as the MME-complied protocol release. If the parameter value is different from the MME-complied protocol release, the way in which the MME handles these message is subject to the MME implementation.

MOD S1INTE RFACE DSP S1INTE RFACE

LBFD-0 0300103 / TDLBF D-00300 103

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Chain Topolog y

GUI Value Range: Release_R8(Release 8), Release_R9(Release 9), Release_R10(Release 10), Release_R11(Release 11), Release_R12(Release 12) Unit: None Actual Value Range: Release_R8, Release_R9, Release_R10, Release_R11, Release_R12 Default Value: Release_R8(Release 8)

257

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackBlin dHoCfg

CnOper atorId

LST CSFAL LBACK BLIND HOCFG

LOFD-0 01033 / TDLOF D-00103 3

CS Fallback to UTRAN

Meaning: Indicates the index of the operator.

Actual Value Range: 0~5

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01034 / TDLOF D-00103 4

CS Fallback to GERAN

TDLOF D-00105 2 TDLOF D-00105 3 TDLOF D-00103 5 TDLOF D-00109 0

GUI Value Range: 0~5 Unit: None Default Value: None

Flash CS Fallback to UTRAN Flash CS Fallback to GERAN CS Fallback to CDMA2 000 1xRTT Enhance d CS Fallback to CDMA2 000 1xRTT

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258

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

GeranEx ternalCe ll

Rac

ADD GERAN EXTER NALCE LL

LOFD-0 01034 / LOFD-0 01034

CS Fallback to GERAN

Meaning: Indicates the routing area code.

LOFD-0 01053

Flash CS Fallback to GERAN

Actual Value Range: 0~255

MOD GERAN EXTER NALCE LL LST GERAN EXTER NALCE LL

CSFallB ackBlin dHoCfg

GeranLc sCap

MOD CSFAL LBACK BLIND HOCFG

LOFD-0 01020 / TDLOF D-00102 0

LOFD-0 01034 / TDLOF D-00103 4

CsfbHo GeranB 1Thd

MOD CSFAL LBACK HO LST CSFAL LBACK HO

Unit: None Default Value: 0

PS InterRAT Mobility between EUTRAN and GERAN CS Fallback to GERAN

Meaning: Indicates the LCS capability of the GERAN. If this parameter is set to ON, the GERAN supports LCS. If this parameter is set to OFF, the GERAN does not support LCS. GUI Value Range: OFF(Off), ON(On)

LST CSFAL LBACK BLIND HOCFG CSFallB ackHo

GUI Value Range: 0~255

Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off) LOFD-0 01034 / TDLOF D-00103 4

CS Fall Back to GERAN

Meaning: Indicates the RSSI threshold for event B1 that is used in CS fallback to GERAN. A UE sends a measurement report related to event B1 to the eNodeB when the RSSI in at least one GERAN cell exceeds this threshold and other triggering conditions are met. For details, see 3GPP TS 36.331. GUI Value Range: -110~-48 Unit: dBm Actual Value Range: -110~-48 Default Value: -103

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259

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CSFallB ackHo

CsfbHo GeranTi meToTri g

MOD CSFAL LBACK HO

LOFD-0 01034 / TDLOF D-00103 4

CS Fall Back to GERAN

Meaning: Indicates the time-to-trigger for event B1 that is used in CS fallback to GERAN. When CS fallback to GERAN is applicable, this parameter is set for UEs and used in the evaluation of whether to trigger event B1. When detecting that the signal quality in at least one GERAN cell meets the entering condition, the UE does not send a measurement report to the eNodeB immediately. Instead, the UE sends a report only when the signal quality continuously meets the entering condition during the time-totrigger. This parameter helps decrease the number of occasionally triggered event reports, the average number of handovers, and the number of wrong handovers, and thus helps to prevent unnecessary handovers. For details, see 3GPP TS 36.331.

LST CSFAL LBACK HO

LongDr xCycleF orMeas

MOD CELLD RXPAR A LST CELLD RXPAR A

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates the length of the long DRX cycle dedicated to GERAN measurement. GUI Value Range: SF128(128 subframes), SF160(160 subframes), SF256(256 subframes), SF320(320 subframes), SF512(512 subframes), SF640(640 subframes), SF1024(1024 subframes), SF1280(1280 subframes), SF2048(2048 subframes), SF2560(2560 subframes) Unit: subframe Actual Value Range: SF128, SF160, SF256, SF320, SF512, SF640, SF1024, SF1280, SF2048, SF2560 Default Value: SF160(160 subframes)

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260

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellDrx Para

OnDurT imerFor Meas

MOD CELLD RXPAR A

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates the length of the On Duration Timer dedicated to GERAN measurement.

LST CELLD RXPAR A

GUI Value Range: PSF1(1 PDCCH subframe), PSF2(2 PDCCH subframes), PSF3(3 PDCCH subframes), PSF4(4 PDCCH subframes), PSF5(5 PDCCH subframes), PSF6(6 PDCCH subframes), PSF8(8 PDCCH subframes), PSF10(10 PDCCH subframes), PSF20(20 PDCCH subframes), PSF30(30 PDCCH subframes), PSF40(40 PDCCH subframes), PSF50(50 PDCCH subframes), PSF60(60 PDCCH subframes), PSF80(80 PDCCH subframes), PSF100(100 PDCCH subframes), PSF200(200 PDCCH subframes) Unit: subframe Actual Value Range: PSF1, PSF2, PSF3, PSF4, PSF5, PSF6, PSF8, PSF10, PSF20, PSF30, PSF40, PSF50, PSF60, PSF80, PSF100, PSF200 Default Value: PSF2(2 PDCCH subframes)

CellDrx Para

DrxInact TimerFo rMeas

MOD CELLD RXPAR A LST CELLD RXPAR A

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates the length of the DRX Inactivity Timer dedicated to GERAN measurement. GUI Value Range: PSF1(1 PDCCH subframe), PSF2(2 PDCCH subframes), PSF3(3 PDCCH subframes), PSF4(4 PDCCH subframes), PSF5(5 PDCCH subframes), PSF6(6 PDCCH subframes), PSF8(8 PDCCH subframes), PSF10(10 PDCCH subframes), PSF20(20 PDCCH subframes), PSF30(30 PDCCH subframes), PSF40(40 PDCCH subframes), PSF50(50 PDCCH subframes), PSF60(60 PDCCH subframes), PSF80(80 PDCCH subframes), PSF100(100 PDCCH subframes), PSF200(200 PDCCH subframes), PSF300(300 PDCCH subframes), PSF500(500 PDCCH subframes), PSF750(750 PDCCH subframes), PSF1280(1280 PDCCH subframes), PSF1920(1920 PDCCH subframes), PSF2560(2560 PDCCH subframes) Unit: subframe Actual Value Range: PSF1, PSF2, PSF3, PSF4, PSF5, PSF6, PSF8, PSF10, PSF20, PSF30, PSF40, PSF50, PSF60, PSF80, PSF100, PSF200, PSF300, PSF500, PSF750, PSF1280, PSF1920, PSF2560 Default Value: PSF2(2 PDCCH subframes)

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261

eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellDrx Para

DrxReT xTimerF orMeas

MOD CELLD RXPAR A

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates the length of the DRX Retransmission Timer dedicated to GERAN measurement.

LST CELLD RXPAR A

GUI Value Range: PSF1(1 PDCCH subframes), PSF2(2 PDCCH subframes), PSF4(4 PDCCH subframes), PSF6(6 PDCCH subframes), PSF8(8 PDCCH subframes), PSF16(16 PDCCH subframes), PSF24(24 PDCCH subframes), PSF33(33 PDCCH subframes) Unit: subframe Actual Value Range: PSF1, PSF2, PSF4, PSF6, PSF8, PSF16, PSF24, PSF33 Default Value: PSF4(4 PDCCH subframes)

CellDrx Para

ShortDr xSwFor Meas

MOD CELLD RXPAR A LST CELLD RXPAR A

CellDrx Para

ShortDr xCycleF orMeas

MOD CELLD RXPAR A LST CELLD RXPAR A

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates whether to enable the short DRX cycle dedicated to GERAN measurement. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off)

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates the length of the short DRX cycle dedicated to GERAN measurement. GUI Value Range: SF2(2 subframes), SF5(5 subframes), SF8(8 subframes), SF10(10 subframes), SF16(16 subframes), SF20(20 subframes), SF32(32 subframes), SF40(40 subframes), SF64(64 subframes), SF80(80 subframes), SF128(128 subframes), SF160(160 subframes), SF256(256 subframes), SF320(320 subframes), SF512(512 subframes), SF640(640 subframes) Unit: subframe Actual Value Range: SF2, SF5, SF8, SF10, SF16, SF20, SF32, SF40, SF64, SF80, SF128, SF160, SF256, SF320, SF512, SF640 Default Value: SF20(20 subframes)

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eRAN TDD CS Fallback Feature Parameter Description

9 Parameters

Parame ter ID

MML Comma nd

Feature ID

Feature Name

Description

CellDrx Para

ShortCy cleTime rForMea s

MOD CELLD RXPAR A

LOFD-0 81283 / TDLOF D-08120 3

UltraFlash CS Fallback to GERAN

Meaning: Indicates the length of the DRX Short Cycle Timer dedicated to GERAN measurement.

LST CELLD RXPAR A

Issue 02 (2016-04-20)

GUI Value Range: 1~16 Unit: None Actual Value Range: 1~16 Default Value: 1

263

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counters

Table 10-1 Counters Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526726992

L.IRATHO.E2G.Pr epAttOut

Number of interRAT handover attempts from EUTRAN to GERAN

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

1526726993

L.IRATHO.E2G.Ex ecAttOut

Number of interRAT handover executions from EUTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

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264

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526726994

L.IRATHO.E2G.Ex ecSuccOut

Number of successful interRAT handovers from E-UTRAN to GERAN

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

1526728306

L.IRATHO.E2G.Pr ep.FailOut.MME

Number of interRAT handover preparation failures from E-UTRAN to GERAN because of faults on the MME side

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-001020 TDLOFD-001020 LOFD-001046 TDLOFD-001046 LOFD-001073 TDLOFD-001073 LOFD-001023 TDLOFD-001023

CS Fallback to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Service based interRAT handover to GERAN Service based InterRAT handover to GERAN Distance based inter-RAT handover to GERAN Distance based Inter-RAT handover to GERAN SRVCC to GERAN SRVCC to GERAN

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265

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728307

L.IRATHO.E2G.Pr ep.FailOut.NoReply

Number of interRAT handover preparation failures from E-UTRAN to GERAN because of no responses from GERAN

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-001020 TDLOFD-001020 LOFD-001046 TDLOFD-001046 LOFD-001073 TDLOFD-001073 LOFD-001023 TDLOFD-001023

CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN Service based interRAT handover to GERAN Service based InterRAT handover to GERAN Distance based inter-RAT handover to GERAN Distance based Inter-RAT handover to GERAN SRVCC to GERAN SRVCC to GERAN

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266

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728308

L.IRATHO.E2G.Pr ep.FailOut.PrepFail ure

Number of interRAT handover preparation failures from E-UTRAN to GERAN due tobecause GERAN cells send handover preparation failure messages

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-001020 TDLOFD-001020 LOFD-001046 TDLOFD-001046 LOFD-001073 TDLOFD-001073 LOFD-001023 TDLOFD-001023

1526728314

L.IRATHO.BlindH O.E2G.ExecAttOut

Number of interRAT blind handovers executions from EUTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

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267

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728315

L.IRATHO.BlindH O.E2G.ExecSuccO ut

Number of successful interRAT blind handovers from EUTRAN to GERAN

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

1526728321

L.CSFB.PrepAtt

Number of CSFB indicators received by the eNodeB

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

1526728322

L.CSFB.PrepSucc

Number of successful CSFB responses from the eNodeB

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

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CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT CS Fallback to CDMA2000 1xRTT CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT CS Fallback to CDMA2000 1xRTT

268

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728323

L.CSFB.E2W

Number of procedures for CSFB to WCDMA network

Multi-mode: None

CS Fallback to UTRAN

GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223 1526728324

L.CSFB.E2G

Number of procedures for CSFB to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 1526728327

L.RRCRedirection. E2G

Number of redirections from EUTRAN to GERAN

Multi-mode: None UMTS: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

LTE: LOFD-001020

CS Fallback to GERAN

LOFD-001034

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None

TDLOFD-001020 TDLOFD-001034

CS Fallback to GERAN 1526728329

L.IRATHO.BlindH O.E2G.PrepAttOut

Number of interRAT blind handover attempts from E-UTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034

CS Fallback to GERAN CS Fallback to GERAN

TDLOFD-001034

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269

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728331

L.RRCRedirection. E2G.PrepAtt

Number of redirection preparations from E-UTRAN to GERAN

Multi-mode: None UMTS: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

LTE: LOFD-001020

CS Fallback to GERAN

LOFD-001034

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None

TDLOFD-001020 TDLOFD-001034

CS Fallback to GERAN 1526728380

L.IRATHO.E2G.Pr epAttOut.PLMN

Number of interRAT handover attempts from EUTRAN to GERAN for a specific operator

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

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270

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728381

L.IRATHO.E2G.Ex ecAttOut.PLMN

Number of interRAT handover executions from EUTRAN to GERAN for a specific operator

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

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271

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728382

L.IRATHO.E2G.Ex ecSuccOut.PLMN

Number of successful interRAT handovers from E-UTRAN to GERAN for a specific operator

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

1526728386

L.CSFB.PrepAtt.Idl e

Number of CSFB indicators received by the eNodeB for UEs in idle mode

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

Issue 02 (2016-04-20)

CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT CS Fallback to CDMA2000 1xRTT

272

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728387

L.CSFB.PrepSucc.I dle

Number of successful CSFB responses from the eNodeB for UEs in idle mode

Multi-mode: None

CS Fallback to UTRAN

GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

1526728388

L.CSFB.E2W.Idle

Number of procedures for CSFB to WCDMA network for UEs in idle mode

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT CS Fallback to CDMA2000 1xRTT CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

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273

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728390

L.IRATHO.BlindH O.E2G.PrepAttOut. PLMN

Number of interRAT blind handover attempts from E-UTRAN to GERAN for a specific operator

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

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274

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728393

L.IRATHO.BlindH O.E2G.ExecAttOut. PLMN

Number of interRAT blind handover executions from EUTRAN to GERAN for a specific operator

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

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275

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728394

L.IRATHO.BlindH O.E2G.ExecSuccO ut.PLMN

Number of successful interRAT blind handover executions from EUTRAN to GERAN for a specific operator

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

1526728400

L.IRATHO.SRVCC .E2W.PrepAttOut

Number of interRAT handover attempts from EUTRAN to WCDMA network for SRVCC

Multi-mode: None

SRVCC to UTRAN

GSM: None

SRVCC to UTRAN

UMTS: None

Ultra-Flash CSFB to UTRAN

LTE: LOFD-001022 TDLOFD-001022

Ultra-Flash CSFB to UTRAN

LOFD-070202 TDLOFD-081223 1526728401

L.IRATHO.SRVCC .E2W.ExecAttOut

Number of interRAT handover executions from EUTRAN to WCDMA network for SRVCC

Multi-mode: None

SRVCC to UTRAN

GSM: None

SRVCC to UTRAN

UMTS: None

Ultra-Flash CSFB to UTRAN

LTE: LOFD-001022 TDLOFD-001022

Ultra-Flash CSFB to UTRAN

LOFD-070202 TDLOFD-081223

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276

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728402

L.IRATHO.SRVCC .E2W.ExecSuccOut

Number of successful interRAT handovers from E-UTRAN to WCDMA network for SRVCC

Multi-mode: None

SRVCC to UTRAN

GSM: None

SRVCC to UTRAN

UMTS: None

Ultra-Flash CSFB to UTRAN

LTE: LOFD-001022 TDLOFD-001022

Ultra-Flash CSFB to UTRAN

LOFD-070202 TDLOFD-081223 1526728403

L.IRATHO.SRVCC .E2G.PrepAttOut

Number of interRAT handover attempts from EUTRAN to GERAN for SRVCC

Multi-mode: None

SRVCC to GERAN

GSM: None

SRVCC to GERAN

UMTS: None

Ultra-Flash CSFB to GERAN

LTE: LOFD-001023 TDLOFD-001023

Ultra-Flash CSFB to GERAN

LOFD-081283 TDLOFD-081203 1526728404

L.IRATHO.SRVCC .E2G.ExecAttOut

Number of interRAT handover executions from EUTRAN to GERAN for SRVCC

Multi-mode: None

SRVCC to GERAN

GSM: None

SRVCC to GERAN

UMTS: None

Ultra-Flash CSFB to GERAN

LTE: LOFD-001023 TDLOFD-001023

Ultra-Flash CSFB to GERAN

LOFD-081283 TDLOFD-081203 1526728405

L.IRATHO.SRVCC .E2G.ExecSuccOut

Number of successful interRAT handovers from E-UTRAN to GERAN for SRVCC

Multi-mode: None

SRVCC to GERAN

GSM: None

SRVCC to GERAN

UMTS: None

Ultra-Flash CSFB to GERAN

LTE: LOFD-001023 TDLOFD-001023

Ultra-Flash CSFB to GERAN

LOFD-081283 TDLOFD-081203 1526728497

L.RRCRedirection. E2W.CSFB

Number of CSFBbased redirections from E-UTRANs to WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033

CS Fallback to UTRAN CS Fallback to UTRAN

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277

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728498

L.RRCRedirection. E2G.CSFB

Number of CSFBbased redirections from E-UTRAN to GERAN

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034

CS Fallback to GERAN

TDLOFD-001034 1526728504

L.IRATHO.E2W.C SFB.PrepAttOut

Number of CSFBbased inter-RAT handover preparation attempts from EUTRAN to WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223 1526728505

L.IRATHO.E2W.C SFB.ExecAttOut

Number of CSFBbased inter-RAT handover execution attempts from EUTRAN to WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223 1526728506

L.IRATHO.E2W.C SFB.ExecSuccOut

Number of successful CSFBbased inter-RAT handover executions from EUTRAN to WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223 1526728507

L.IRATHO.E2G.CS FB.PrepAttOut

Number of CSFBbased inter-RAT handover preparation attempts from EUTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 Issue 02 (2016-04-20)

278

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728508

L.IRATHO.E2G.CS FB.ExecAttOut

Number of CSFBbased inter-RAT handover execution attempts from EUTRAN to GERAN

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 1526728509

L.IRATHO.E2G.CS FB.ExecSuccOut

Number of successful CSFBbased inter-RAT handover executions from EUTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 1526728513

L.CSFB.PrepFail.C onflict

Number of CSFB preparation failures because of process conflict

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

1526728705

L.FlashCSFB.E2W

Number of procedures for flash CSFB to WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001052

CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT CS Fallback to CDMA2000 1xRTT Flash CS Fallback to UTRAN Flash CS Fallback to UTRAN

TDLOFD-001052

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279

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728706

L.FlashCSFB.E2G

Number of procedures for flash CSFB to GERAN

Multi-mode: None

Flash CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001053

Flash CS Fallback to GERAN

TDLOFD-001053 1526728707

L.CSFB.PrepAtt.E mergency

Number of CSFB indicators received by the eNodeB for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

1526728708

L.CSFB.PrepSucc. Emergency

Number of responses sent from the eNodeB for CSFB triggered for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

1526728709

L.CSFB.E2W.Emer gency

Number of procedures for CSFB to WCDMA network triggered for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033

TDLOFD-001033

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280

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728710

L.CSFB.E2G.Emer gency

Number of procedures for CSFB to GERAN triggered for emergency calls

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 1526728899

1526728900

1526728946

L.IRATHO.E2W.C SFB.MMEAbnorm Rsp

L.IRATHO.E2G.CS FB.MMEAbnormR sp

L.RIM.SI.E2W.Req

Number of responses for abnormal causes received by the eNodeB from the MME during CSFB-based interRAT handover executions from EUTRAN to WCDMA network

Multi-mode: None

Number of responses for abnormal causes received by the eNodeB from the MME during CSFB-based interRAT handover executions from EUTRAN to GERAN

Multi-mode: None

Number of times the eNodeB sends a system information request to a WCDMA network

Multi-mode: None

GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203

GSM: None UMTS: None LTE: LOFD-001052

Flash CS Fallback to UTRAN Flash CS Fallback to UTRAN

TDLOFD-001052 1526728947

L.RIM.SI.E2W.Res p

Number of times the eNodeB receives a system information response from a WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001052

Flash CS Fallback to UTRAN Flash CS Fallback to UTRAN

TDLOFD-001052

Issue 02 (2016-04-20)

281

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526728948

L.RIM.SI.E2W.Upd ate

Number of times the eNodeB receives a system information update from a WCDMA network

Multi-mode: None

Flash CS Fallback to UTRAN

GSM: None UMTS: None LTE: LOFD-001052

Flash CS Fallback to UTRAN

TDLOFD-001052 1526728949

L.RIM.Load.E2W. Req

Number of times the eNodeB sends a load information request to a WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001044

Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN

TDLOFD-001044 1526728950

L.RIM.Load.E2W. Resp

Number of times the eNodeB receives a load information response from a WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001044

Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN

TDLOFD-001044 1526728951

L.RIM.Load.E2W. Update

Number of times the eNodeB receives a load information update from a WCDMA network

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001044

Inter-RAT Load Sharing to UTRAN Inter-RAT Load Sharing to UTRAN

TDLOFD-001044 1526729260

L.CSFB.E2G.Idle

Number of procedures for CSFB to GERAN network for UEs in idle mode

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203

Issue 02 (2016-04-20)

282

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526729433

L.IRATHO.E2G.Ti meAvg

Average handover duration from EUTRAN to GERAN

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

1526729504

L.RRCRedirection. E2G.PLMN

Number of redirections from EUTRAN to GERAN for a specific operator

Multi-mode: None UMTS: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

LTE: LOFD-001020

CS Fallback to GERAN

LOFD-001034

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None

TDLOFD-001020 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

CS Fallback to GERAN RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

1526729505

L.CCOwithNACC. E2G.CSFB.ExecAtt Out

Number of CSFBbased CCO with NACC executions from E-UTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034

CS Fallback to GERAN CS Fallback to GERAN

TDLOFD-001034

Issue 02 (2016-04-20)

283

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526729506

L.CCOwithNACC. E2G.CSFB.ExecSu ccOut

Number of successful CSFBbased CCOs with NACC from EUTRAN to GERAN

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034

CS Fallback to GERAN

TDLOFD-001034 1526729507

L.CCOwithoutNAC C.E2G.CSFB.Exec AttOut

Number of CSFBbased CCO without NACC executions from E-UTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034

CS Fallback to GERAN CS Fallback to GERAN

TDLOFD-001034 1526729508

L.CCOwithoutNAC C.E2G.CSFB.Exec SuccOut

Number of successful CSFBbased CCOs without NACC from E-UTRAN to GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034

CS Fallback to GERAN CS Fallback to GERAN

TDLOFD-001034 1526729509

L.IRATHO.E2W.C SFB.PrepAttOut.E mergency

Number of CSFBbased handover preparation attempts to WCDMA network triggered for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223 1526729510

L.IRATHO.E2W.C SFB.ExecAttOut.E mergency

Number of CSFBbased handover execution attempts to WCDMA network triggered for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

Issue 02 (2016-04-20)

284

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526729511

L.IRATHO.E2W.C SFB.ExecSuccOut. Emergency

Number of successful CSFBbased handover executions to WCDMA network triggered for emergency calls

Multi-mode: None

CS Fallback to UTRAN

GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223 1526729512

L.IRATHO.E2G.CS FB.PrepAttOut.Em ergency

Number of CSFBbased handover preparation attempts to GERAN triggered for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 1526729513

L.IRATHO.E2G.CS FB.ExecAttOut.Em ergency

Number of CSFBbased handover execution attempts to GERAN triggered for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 1526729514

L.IRATHO.E2G.CS FB.ExecSuccOut.E mergency

Number of successful CSFBbased handover executions to GERAN triggered for emergency calls

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-081283

CS Fallback to GERAN CS Fallback to GERAN Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203

Issue 02 (2016-04-20)

285

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526729515

L.RRCRedirection. E2W.CSFB.TimeO ut

Number of CSFBbased blind redirections from EUTRAN to WCDMA network caused by CSFB protection timer expiration

Multi-mode: None

CS Fallback to UTRAN

Number of CSFBbased blind redirections from EUTRAN to GERAN caused by CSFB protection timer expiration

Multi-mode: None

Number of handover attempts from a specific EUTRAN cell to a specific GERAN cell

Multi-mode: None

1526729516

1526729562

L.RRCRedirection. E2G.CSFB.TimeOu t

L.IRATHO.NCell.E 2G.PrepAttOut

GSM: None UMTS: None LTE: LOFD-001033

CS Fallback to UTRAN

TDLOFD-001033

GSM: None UMTS: None LTE: LOFD-001034

CS Fallback to GERAN CS Fallback to GERAN

TDLOFD-001034

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

1526729563

L.IRATHO.NCell.E 2G.ExecAttOut

Number of handover executions from a specific E-UTRAN cell to a specific GERAN cell

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

Issue 02 (2016-04-20)

286

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526729564

L.IRATHO.NCell.E 2G.ExecSuccOut

Number of successful handovers from a specific E-UTRAN cell to a specific GERAN cell

Multi-mode: None

PS Inter-RAT Mobility between E-UTRAN and GERAN

GSM: None UMTS: None LTE: LOFD-001020 LOFD-001023 LOFD-001034 TDLOFD-001020 TDLOFD-001023 TDLOFD-001034

SRVCC to GERAN CS Fallback to GERAN PS Inter-RAT Mobility between E-UTRAN and GERAN SRVCC to GERAN CS Fallback to GERAN

1526729661

L.RIM.SI.E2G.Req

Number of times the eNodeB sends a system information request to a GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001053

Flash CS Fallback to GERAN Flash CS Fallback to GERAN

TDLOFD-001053 1526729662

L.RIM.SI.E2G.Res p

Number of times the eNodeB receives a system information response from a GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001053

Flash CS Fallback to GERAN Flash CS Fallback to GERAN

TDLOFD-001053 1526729663

L.RIM.SI.E2G.Upd ate

Number of times the eNodeB receives a system information update from a GERAN

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001053

Flash CS Fallback to GERAN Flash CS Fallback to GERAN

TDLOFD-001053

Issue 02 (2016-04-20)

287

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526730044

L.CSFB.PrepAtt.PL MN

Number of CSFB indicators received by the eNodeB for a specific operator

Multi-mode: None

CS Fallback to UTRAN

GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

1526730045

L.CSFB.PrepSucc.P LMN

Number of successful CSFB responses sent from the eNodeB for a specific operator

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

Issue 02 (2016-04-20)

288

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526730050

L.RRCRedirection. E2G.CSFB.PLMN

Number of CSFBbased redirections from E-UTRAN to GERAN for a specific operator

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

CS Fallback to GERAN RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

1526730051

L.IRATHO.E2G.CS FB.PrepAttOut.PL MN

Number of CSFBbased handover preparation attempts from EUTRAN to GERAN for a specific operator

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

CS Fallback to GERAN CS Fallback to GERAN RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

1526730052

L.IRATHO.E2G.CS FB.ExecAttOut.PL MN

Number of CSFBbased handover execution attempts from E-UTRAN to GERAN for a specific operator

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

CS Fallback to GERAN CS Fallback to GERAN RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

Issue 02 (2016-04-20)

289

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526730053

L.IRATHO.E2G.CS FB.ExecSuccOut.P LMN

Number of successful CSFBbased handover executions from EUTRAN to GERAN for a specific operator

Multi-mode: None

CS Fallback to GERAN

GSM: None UMTS: None LTE: LOFD-001034 TDLOFD-001034 LOFD-001036 LOFD-001037 TDLOFD-001036 TDLOFD-001037 LOFD-070206

CS Fallback to GERAN RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier RAN Sharing with Common Carrier RAN Sharing with Dedicated Carrier Hybrid RAN Sharing

1526730076

L.IRATHO.E2W.C SFB.Prep.FailOut. MME

Number of CSFBbased outgoing handover preparation failures from E-UTRAN to WCDMA network because of the MME side causes

Multi-mode: None GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223 1526730077

1526730078

Issue 02 (2016-04-20)

L.IRATHO.E2W.C SFB.Prep.FailOut.P repFailure

L.IRATHO.E2W.C SFB.Prep.FailOut.N oReply

Number of CSFBbased outgoing handover preparation failures from E-UTRAN to WCDMA network because of the response of handover preparation failure from WCDMA network

Multi-mode: None

Number of CSFBbased outgoing handover preparation failures from E-UTRAN to WCDMA network because of no response from WCDMA network

Multi-mode: None

GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-001033 TDLOFD-001033 LOFD-070202

CS Fallback to UTRAN CS Fallback to UTRAN Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

290

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526730082

L.IRATHO.E2W.S RVCC.Prep.FailOut .MME

Number of SRVCCbased outgoing handover preparation failures from E-UTRAN to WCDMA network because of the MME side causes

Multi-mode: None

SRVCC to UTRAN

GSM: None

SRVCC to UTRAN

UMTS: None

Ultra-Flash CSFB to UTRAN

LTE: LOFD-001022 TDLOFD-001022

Ultra-Flash CSFB to UTRAN

LOFD-070202 TDLOFD-081223

1526730083

1526730084

1526730088

L.IRATHO.E2W.S RVCC.Prep.FailOut .PrepFailure

L.IRATHO.E2W.S RVCC.Prep.FailOut .NoReply

L.IRATHO.E2G.SR VCC.Prep.FailOut. MME

Number of SRVCCbased outgoing handover preparation failures from E-UTRAN to WCDMA network because of the response of handover preparation failure from WCDMA network

Multi-mode: None

SRVCC to UTRAN

GSM: None

SRVCC to UTRAN

UMTS: None

Ultra-Flash CSFB to UTRAN

Number of SRVCCbased outgoing handover preparation failures from E-UTRAN to WCDMA network because of no response from WCDMA network

Multi-mode: None

SRVCC to UTRAN

GSM: None

SRVCC to UTRAN

UMTS: None

Ultra-Flash CSFB to UTRAN

Number of SRVCCbased outgoing handover preparation failures from E-UTRAN to GERAN because of the MME side causes

Multi-mode: None

SRVCC to GERAN

GSM: None

SRVCC to GERAN

UMTS: None

Ultra-Flash CSFB to GERAN

LTE: LOFD-001022 TDLOFD-001022

Ultra-Flash CSFB to UTRAN

LOFD-070202 TDLOFD-081223

LTE: LOFD-001022 TDLOFD-001022

Ultra-Flash CSFB to UTRAN

LOFD-070202 TDLOFD-081223

LTE: LOFD-001023 TDLOFD-001023

Ultra-Flash CSFB to GERAN

LOFD-081283 TDLOFD-081203

Issue 02 (2016-04-20)

291

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526730089

L.IRATHO.E2G.SR VCC.Prep.FailOut. PrepFailure

Number of SRVCCbased outgoing handover preparation failures from E-UTRAN to GERAN because of the response of handover preparation failure from GERAN

Multi-mode: None

SRVCC to GERAN

GSM: None

SRVCC to GERAN

UMTS: None

Ultra-Flash CSFB to GERAN

Number of SRVCCbased outgoing handover preparation failures from E-UTRAN to GERAN because of no response from GERAN

Multi-mode: None

SRVCC to GERAN

GSM: None

SRVCC to GERAN

UMTS: None

Ultra-Flash CSFB to GERAN

1526730090

L.IRATHO.E2G.SR VCC.Prep.FailOut. NoReply

LTE: LOFD-001023 TDLOFD-001023

Ultra-Flash CSFB to GERAN

LOFD-081283 TDLOFD-081203

LTE: LOFD-001023 TDLOFD-001023

Ultra-Flash CSFB to GERAN

LOFD-081283 TDLOFD-081203

1526730140

L.Paging.UU.Succ. CSFB

Number of paging responses for CSFB received from UEs in a cell

Multi-mode: None

Paging

GSM: None

Paging

UMTS: None

CS Fallback to UTRAN

LTE: LBFD-002011 TDLBFD-002011 LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT CS Fallback to CDMA2000 1xRTT

Issue 02 (2016-04-20)

292

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526730145

L.Paging.S1.Rx.CS

Number of received paging messages with the IE CN DOMAIN set to CS over the S1 interface in a cell

Multi-mode: None

Paging

GSM: None

Paging

UMTS: None

CS Fallback to UTRAN

LTE: LBFD-002011 TDLBFD-002011 LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034 LOFD-001035 TDLOFD-001035

CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN CS Fallback to CDMA2000 1xRTT CS Fallback to CDMA2000 1xRTT

1526730146

1526730147

1526730148

1526733006

L.IRATHO.CSFB.S RVCC.E2W.PrepAt tOut

L.IRATHO.CSFB.S RVCC.E2W.ExecAt tOut

L.IRATHO.CSFB.S RVCC.E2W.ExecS uccOut

L.IRATHO.CSFB.S RVCC.E2G.PrepAtt Out

Number of SRVCCbased outgoing handover attempts from E-UTRAN to WCDMA network for ultra-flash CSFB

Multi-mode: None

Number of SRVCCbased outgoing handover executions from EUTRAN to WCDMA network for ultra-flash CSFB

Multi-mode: None

Number of successful SRVCCbased outgoing handovers from EUTRAN to WCDMA network for ultra-flash CSFB

Multi-mode: None

Number of SRVCCbased outgoing handover attempts from E-UTRAN to GERAN for ultraflash CSFB

Multi-mode: None

GSM: None UMTS: None LTE: LOFD-070202

Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-070202

Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-070202

Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-081283

Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203

Issue 02 (2016-04-20)

293

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526733007

L.IRATHO.CSFB.S RVCC.E2G.ExecAt tOut

Number of SRVCCbased outgoing handover executions from EUTRAN to GERAN for ultraflash CSFB

Multi-mode: None

Ultra-Flash CSFB to GERAN

Number of successful SRVCCbased outgoing handovers from EUTRAN to GERAN for ultraflash CSFB

Multi-mode: None

Number of abnormal responses from the MME during outgoing handovers from EUTRAN to GERAN for ultraflash CSFB

Multi-mode: None

Number of responses for abnormal causes received by the eNodeB from the MME during handovers from the E-UTRAN to WCDMA networks for ultra-flash CSFB

Multi-mode: None

Number of MMEcaused preparation failures of outgoing handovers to WCDMA networks for ultra-flash CSFB

Multi-mode: None

1526733008

1526733009

1526736728

1526736729

Issue 02 (2016-04-20)

L.IRATHO.CSFB.S RVCC.E2G.ExecSu ccOut

L.IRATHO.CSFB.S RVCC.E2G.MMEA bnormRsp

L.IRATHO.CSFB.S RVCC.E2W.MME AbnormRsp

L.IRATHO.E2W.C SFB.SRVCC.Prep.F ailOut.MME

GSM: None UMTS: None LTE: LOFD-081283

Ultra-Flash CSFB to GERAN

TDLOFD-081203

GSM: None UMTS: None LTE: LOFD-081283

Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203

GSM: None UMTS: None LTE: LOFD-081283

Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203

GSM: None UMTS: None LTE: LOFD-070202

Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-070202

Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

294

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526736730

L.IRATHO.E2W.C SFB.SRVCC.Prep.F ailOut.PrepFailure

Number of preparation failures of outgoing handovers to WCDMA networks for ultra-flash CSFB because of the response of handover preparation failure sent by the WCDMA networks

Multi-mode: None

Ultra-Flash CSFB to UTRAN

Number of preparation failures of outgoing handovers to WCDMA networks for ultra-flash CSFB because of no response from the WCDMA networks

Multi-mode: None

Number of MMEcaused preparation failures of outgoing handovers to GERANs for ultraflash CSFB

Multi-mode: None

1526736731

1526736732

L.IRATHO.E2W.C SFB.SRVCC.Prep.F ailOut.NoReply

L.IRATHO.E2G.CS FB.SRVCC.Prep.Fa ilOut.MME

GSM: None UMTS: None LTE: LOFD-070202

Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-070202

Ultra-Flash CSFB to UTRAN Ultra-Flash CSFB to UTRAN

TDLOFD-081223

GSM: None UMTS: None LTE: LOFD-081283

Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203 1526736733

Issue 02 (2016-04-20)

L.IRATHO.E2G.CS FB.SRVCC.Prep.Fa ilOut.PrepFailure

Number of preparation failures of outgoing handovers to GERANs for ultraflash CSFB because of the response of handover preparation failure sent by the GERANs

Multi-mode: None GSM: None UMTS: None LTE: LOFD-081283

Ultra-Flash CSFB to GERAN Ultra-Flash CSFB to GERAN

TDLOFD-081203

295

eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526736734

L.IRATHO.E2G.CS FB.SRVCC.Prep.Fa ilOut.NoReply

Number of preparation failures of outgoing handovers to GERANs for ultraflash CSFB because of no response from the GERANs

Multi-mode: None

Ultra-Flash CSFB to GERAN

Number of times inter-eNodeB intraduplex-mode outgoing handovers are canceled due to flow conflicts

Multi-mode: None

1526741920

L.HHO.FailOut.HO Cancel.FlowConflic t

GSM: None UMTS: None LTE: LOFD-081283

Ultra-Flash CSFB to GERAN

TDLOFD-081203

GSM: None UMTS: None LTE: LBFD-00201801 LBFD-00201802 TDLBFD-0020180 1 TDLBFD-0020180 2 LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034

Coverage Based Intra-frequency Handover Coverage Based Inter-frequency Handover Coverage Based Intra-frequency Handover Coverage Based Inter-frequency Handover CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN

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Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526741921

L.HHO.InterFddTd d.FailOut.HOCance l.FlowConflict

Number of times inter-eNodeB interduplex-mode outgoing handovers are canceled due to flow conflicts

Multi-mode: None

Coverage Based Intra-frequency Handover

GSM: None UMTS: None LTE: LBFD-00201801 LBFD-00201802 TDLBFD-0020180 1 TDLBFD-0020180 2 LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034

Coverage Based Inter-frequency Handover Coverage Based Intra-frequency Handover Coverage Based Inter-frequency Handover CS Fallback to UTRAN CS Fallback to UTRAN CS Fallback to GERAN CS Fallback to GERAN

1526741922

L.IRATHO.E2W.H OCancel.FlowConfl ict

Number of times EUTRAN-toWCDMA handovers are canceled due to flow conflict

Multi-mode: None GSM: None UMTS: None LTE: LBFD-00201801 LBFD-00201802 TDLBFD-0020180 1 TDLBFD-0020180 2 LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034

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eRAN TDD CS Fallback Feature Parameter Description

10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526741923

L.IRATHO.E2G.H OCancel.FlowConfl ict

Number of times EUTRAN-toGERAN handovers are canceled due to flow conflicts

Multi-mode: None

Coverage Based Intra-frequency Handover

GSM: None UMTS: None LTE: LBFD-00201801 LBFD-00201802 TDLBFD-0020180 1 TDLBFD-0020180 2 LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034

1526741924

L.IRATHO.E2T.HO Cancel.FlowConflic t

Number of times EUTRAN-toTDSCDMA handovers are canceled due to flow conflicts

Multi-mode: None GSM: None UMTS: None LTE: LBFD-00201801 LBFD-00201802 TDLBFD-0020180 1 TDLBFD-0020180 2 LOFD-001033 TDLOFD-001033 LOFD-001034 TDLOFD-001034

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10 Counters

Counter ID

Counter Name

Counter Description

Feature ID

Feature Name

1526742170

L.IRATHO.SRVCC .FailOut.HOCancel. ReEst

Number of SRVCCbased Outgoing Handover Cancellations Due to RRC Connection Re-establishments

Multi-mode: None

SRVCC to UTRAN

GSM: None

SRVCC to UTRAN

UMTS: None

Ultra-Flash CSFB to UTRAN

LTE: LOFD-001022 TDLOFD-001022

Ultra-Flash CSFB to UTRAN

LOFD-070202 TDLOFD-081223

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Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

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Reference Documents

3GPP TS 23.216, "Single Radio Voice Call Continuity (SRVCC); Stage 2"

3GPP TS 23.272, "Circuit Switched (CS) fallback in Evolved Packet System (EPS)"

3GPP TS 23.401, "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access"

3GPP TS 36.300, "E-UTRAN Overall description"

3GPP TS 48.018, "General Packet Radio Service (GPRS); Base Station System (BSS) Serving GPRS Support Node (SGSN); BSS GPRS protocol (BSSGP) "

VoLGA Forum Specifications

Emergency Call

Inter-RAT Mobility Management in Connected Mode

Interoperability Between GSM and LTE

10. Interoperability Between UMTS and LTE 11. LCS

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Appendix

13.1 Signaling Procedures Involved in CSFB to UTRAN 13.1.1 Combined EPS/IMSI Attach Procedure The combined EPS/IMSI attach procedure is performed by exchanging NAS messages. Therefore, this procedure is transparent to the eNodeBs. After a CSFB-capable UE is powered on in the E-UTRAN, the UE initiates a combined EPS/IMSI attach procedure, as shown in Figure 13-1. Figure 13-1 Combined EPS/IMSI attach procedure

HSS: home subscriber server

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NOTE

The symbols that appear in signaling procedure figures throughout this document are explained as follows: l An arrow denotes the transmission of a message. l A plain box denotes a mandatory procedure. l A dashed box denotes an optional procedure.

The combined EPS/IMSI attach procedure is described as follows: 1.

The UE sends a Combined attach request message to the MME, requesting a combined EPS/IMSI attach procedure. This message also indicates whether the CSFB or SMS over SGs function is required.

The EPS attach procedure is performed in the same way as it is performed within the LTE system. For details, see section 5.3.2 in 3GPP TS 23.401 V9.2.0.

The MME allocates an LAI to the UE, and then it finds the MSC/VLR for the UE based on the LAI. If multiple PLMNs are available for the CS domain, the MME selects a PLMN based on the selected PLMN information reported by the eNodeB. Then, the MME sends the MSC/VLR a Location update request message, which contains the new LAI, IMSI, MME name, and location update type.

The MSC/VLR performs the location update procedure in the CS domain.

The MSC/VLR responds with a Location update accept message that contains information about the VLR and temporary mobile subscriber identity (TMSI). The location update procedure is successful.

The UE is informed that the combined EPS/IMSI attach procedure is successful. If the network supports SMS over SGs but not CSFB, the message transmitted to the UE contains the information element (IE) SMS-only. The message indicates that the combined EPS/IMSI attach procedure is successful but only SMS is supported.

13.1.2 CSFB Based on PS Handover During CSFB based on PS handover, the UE is transferred from the E-UTRAN to the UTRAN by performing a PS handover. It then initiates a CS service in the UTRAN.

Mobile-Originated Call Figure 13-2 shows the procedure for CSFB to UTRAN based on PS handover for mobileoriginated calls.

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Figure 13-2 CSFB to UTRAN based on PS handover for mobile-originated calls

The UE sends the MME an NAS message Extended Service Request to initiate a CS service.

The MME sends an S1-AP message to instruct the eNodeB to initiate a CSFB procedure. If the MME supports the LAI-related feature, the MME also delivers the LAI to the eNodeB.

The eNodeB determines whether to perform a blind handover based on the UE capabilities, parameters settings, and algorithm policies.

The eNodeB initiates the preparation phase for a PS handover. If the preparation is successful, the eNodeB instructs the UE to perform a handover. NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 3.5 Decision and 3.6 Execution.

After the handover, the UE may initiate a CS call establishment procedure with an LAU or combined RAU/LAU procedure in the UTRAN.

The follow-up procedures are performed for the PS handover. These procedures include data forwarding, path switching, and RAU. This step is performed together with 5.

Mobile-Terminated Call Figure 13-3 shows the procedure for CSFB to UTRAN based on PS handover for mobileterminated calls.

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Figure 13-3 CSFB to UTRAN based on PS handover for mobile-terminated calls

The MSC sends a Paging Request message from the CS domain to the MME over the SGs interface. Then, either of the following occurs: –

If the UE is in idle mode, the MME sends a Paging message to the eNodeB. Then the eNodeB sends a Paging message over the Uu interface to inform the UE of an incoming call from the CS domain.

–

If the UE is in active mode, the MME sends the UE an NAS message to inform the UE of an incoming call from the CS domain.

The UE sends an Extended Service Request message containing a CS Fallback Indicator after receiving the paging message from the CS domain.

The MME instructs the eNodeB over the S1 interface to perform CSFB.

The subsequent steps are similar to steps 3 through 6 in the procedure for CSFB to UTRAN based on PS handover for mobile-originated calls. The only difference is that the UE sends a Paging Response message from the UTRAN cell.

13.1.3 CSFB Based on Redirection During CSFB based on PS redirection, the eNodeB receives a CS Fallback Indicator, and then it sends an RRC Connection Release message to release the UE. The message contains information about a target UTRAN frequency, reducing the time for the UE to search for a target network. After selecting the UTRAN, the UE acquires the system information of a UTRAN cell. Then, the UE performs initial access to the cell to initiate a CS service. For the UTRAN, the UE is an initially accessing user.

Mobile-Originated Call Figure 13-4 shows the procedure for CSFB to UTRAN based on redirection for mobileoriginated calls.

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Figure 13-4 CSFB to UTRAN based on redirection for mobile-originated calls

The UE sends the MME an NAS message Extended Service Request to initiate a CS service.

The MME sends an S1-AP message to instruct the eNodeB to initiate a CSFB procedure. If the MME supports the LAI-related feature, the MME also delivers the LAI to the eNodeB.

The eNodeB determines whether to perform a blind handover based on the UE capabilities, parameters settings, and algorithm policies.

The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection. The message contains information about a target UTRAN frequency. Then, the eNodeB initiates an S1 UE context release procedure. NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 3.5 Decision and 3.6 Execution.

The UE may initiate an LAU, a combined RAU/LAU, or both an RAU and an LAU in the target cell.

The UE initiates a CS call establishment procedure in the target UTRAN cell.

Mobile-Terminated Call In a mobile-terminated call, the MSC sends a Paging request message from the CS domain to the MME over the SGs interface, and then the MME or eNodeB initiates a paging procedure for the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFB Based on PS Handover. The subsequent steps are the same as the steps in the procedure for CSFB to UTRAN based on redirection for mobile-originated calls. Issue 02 (2016-04-20)

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13.1.4 Flash CSFB During the flash CSFB procedure, the eNodeB receives a CS Fallback Indicator, and then it sends an RRC Connection Release message to release the UE. The message contains information about a target UTRAN frequency, as well as one or more physical cell identities and their associated system information. In this way, the UE can quickly access the target UTRAN without the need to perform the procedure for acquiring system information of the target UTRAN cell. Then, the UE can directly initiate a CS service in the UTRAN cell.

Mobile-Originated Call Figure 13-5 shows the procedure for CSFB to UTRAN based on flash redirection for mobileoriginated calls. Figure 13-5 CSFB to UTRAN based on flash redirection for mobile-originated calls

The UE sends the MME an NAS message Extended Service Request to initiate a CS service.

The MME sends an S1-AP message to instruct the eNodeB to initiate a CSFB procedure. If the MME supports the LAI-related feature, the MME also delivers the LAI to the eNodeB.

The eNodeB determines whether to perform a blind handover based on the UE capabilities, parameters settings, and algorithm policies.

The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection. The message contains information about a target UTRAN frequency, as well as one or more physical cell identities and their associated system information. Then, the eNodeB initiates an S1 UE context release procedure.

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NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 3.5 Decision and 3.6 Execution. The system information of the target cell is acquired during the RIM procedure.

The UE may initiate an LAU, a combined RAU/LAU, or both an RAU and an LAU in the target cell.

The UE initiates a CS call establishment procedure in the target UTRAN cell.

13.1.5 Ultra-Flash CSFB to UTRAN Mobile-Originated Call Figure 13-6 shows the procedure of ultra-flash CSFB to UTRAN for mobile-originated calls. For details about the standard procedure, see chapter 6 "Mobile Originating Call" in 3GPP TS 23.272 V10.9.0 and 3GPP TS 24.008 V11.0.0.

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Figure 13-6 Flash CSFB to UTRAN for mobile-originated calls

Mobile-Terminated Call Figure 13-7 shows the procedure of ultra-flash CSFB to UTRAN for mobile-terminated calls. For details about the standard procedure, see chapter 7 "Mobile Terminating Call" in 3GPP TS 23.272 V10.9.0 and 3GPP TS 24.008 V11.0.0.

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Figure 13-7 Ultra-flash CSFB to UTRAN for mobile-terminated calls

Steps 1 to 4b: The UE initiates voice services (mobile-originated calls and mobile-terminated calls) on the E-UTRAN. The eNodeB triggers SRVCC to UTRAN. Special treatment has been applied to the MME and MSC to ensure a proper procedure. Step 3b: The RNC receives an SRVCC request and prepares CS resources. Step 4: The eNodeB receives the handover command transferred over the core network and sends it to the UE. Step 5: The UE is transferred to the UTRAN. Steps 6 to 9: The UE establishes voice services on the UTRAN. Signaling is transmitted at a speed of 13.6 kbit/s, which accelerates the transfer and reduces delays. As shown in the preceding figures, Ultra-Flash CSFB to UTRAN excludes the following procedures: l

Authentication procedure The UE has been authenticated in the LTE system before CSFB to UTRAN.

Ciphering procedure The UE has performed ciphering as instructed during SRVCC. Therefore, the ciphering procedure is not required after the UE is transferred to the UTRAN.

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IMEI check procedure The MME has sent the IMEI to the MSC during the preparation for SRVCC. The procedure is not required in the UTRAN after SRVCC.

CS resource setup procedure The UTRAN system has prepared CS resources during SRVCC and therefore the UE does not need to reestablish the CS resource after SRVCC. The procedure is not required in the UTRAN after SRVCC.

13.1.6 Redirection-based CSFB Optimization for UEs in Idle Mode After the eNodeB receives an initial context setup request with a CS Fallback Indicator from the MME, the eNodeB does not perform the UE capability query, security mode activation, or RRC connection reconfiguration procedure with dashed lines in the following figure. If the eNodeB does not obtain the UE capability before CSFB execution, the eNodeB still needs to initiate a UE capability query procedure. Figure 13-8 Redirection-based CSFB optimization for UEs in idle mode

13.1.7 Signaling Procedures for SMS SMS services are unknown to the eNodeB because SMS messages are encapsulated in NAS messages. During interworking with the UTRAN, SMS messages are exchanged between the Issue 02 (2016-04-20)

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MME and the MSC over the SGs interface. Because a UE does not require fallback to the UTRAN to perform an SMS service, the SMS over SGs function can be used in a place covered only by the E-UTRAN. As the SMS service is transparent to the eNodeB, the procedure is not described in this document. For details about the procedure, see section 8.2 in 3GPP TS 23.272 V10.0.0.

13.1.8 Emergency Call The CSFB procedure for an emergency call is the same as the CSFB procedure for a normal mobile-originated voice service. The UE sends an RRC Connection Request message over the Uu interface or the MME sends an Initial Context Setup Request or UE Context Modification Request message, which contains an IE to inform the eNodeB of the service type. Emergency calls take precedence over other services in the eNodeB. If PS handover is used for CSFB for emergency calls, the eNodeB does not restrict the cells in the handover restriction list when selecting the target cell. The eNodeB sends the RNC a handover request with the IE CSFB high priority in the IE Source to Target Transparent Container. This request informs the RNC that a CSFB procedure is required for an emergency call. Upon receiving the information, the RNC preferentially processes this call when using related algorithms such as admission control. If redirection is used for CSFB for emergency calls, the RRC Connection Request message that the UE sends when accessing the UTRAN contains the indication of a CS emergency call. The UTRAN will treat this call as a common CS emergency call. For details about admission and preemption of emergency calls, see Emergency Call.

13.1.9 CSFB for LCS After a UE initiates an LCS request, the MME performs an attach or combined TAU/LAU procedure to inform the UE of the LCS capability of the EPS. If the EPS does not support LCS, the UE falls back to the UTRAN to initiate LCS under the control of the EPS. The CSFB procedure is the same as the procedure for CSFB to UTRAN for mobile-originated calls. If the UTRAN initiates an LCS request towards a UE camping on an E-UTRAN cell, the MSC sends an LCS indicator to the MME over the SGs interface. Then, the MME instructs the eNodeB to perform CSFB for the UE. The CSFB procedure is the same as the procedure for CSFB to UTRAN for mobile-terminated calls. The UE performs the LCS service after the fallback to the UTRAN. For details about the CSFB procedure for LCS, see section 8.3 in 3GPP TS 23.272 V10.0.0 and LCS.

13.2 Signaling Procedures Involved in CSFB to GERAN 13.2.1 Combined EPS/IMSI Attach Procedure The combined EPS/IMSI attach procedure for CSFB to GERAN is the same as that for CSFB to UTRAN. For details, see 13.1.1 Combined EPS/IMSI Attach Procedure. Issue 02 (2016-04-20)

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13.2.2 CSFB Based on PS Handover During CSFB based on PS handover, the UE is transferred from the E-UTRAN to the GERAN by performing a PS handover. It then initiates a CS service in the GERAN. If the GERAN or UE does not support dual transfer mode (DTM, in which CS and PS services run simultaneously), the ongoing PS services of the UE are suspended before a CS service is set up.

Mobile-Originated Call Figure 13-9 shows the procedure for CSFB to GERAN based on PS handover for mobileoriginated calls. Figure 13-9 CSFB to GERAN based on PS handover for mobile-originated calls

The procedure is described as follows: 1.

The UE sends the MME a NAS message Extended service request to initiate a CS service.

The MME instructs the eNodeB to initiate a CSFB procedure. If the MME supports the LAI-related feature, the MME also delivers the LAI to the eNodeB.

The eNodeB determines whether to perform blind handover based on the UE capabilities, parameters settings, and algorithm policies.

The eNodeB initiates the preparation phase for a PS handover. If the preparation is successful, the eNodeB instructs the UE to perform a handover. If the GERAN or UE does not support DTM, the ongoing PS services of the UE are suspended, and the SGSN update bearers with the S-GW/P-GW.

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NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 4.5 Decision and 4.6 Execution.

After the handover, the UE may initiate a CS call establishment procedure with an LAU or combined RAU/LAU procedure in the GERAN.

The follow-up procedures are performed for the PS handover. These procedures include data forwarding, path switching, and RAU, which are performed together with step 5.

Mobile-Terminated Call In a mobile-terminated call, the MSC sends a Paging request message from the CS domain to the MME over the SGs interface, and then the MME or eNodeB initiates a paging procedure for the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFB Based on PS Handover. The subsequent steps are the same as the steps in the procedure for CSFB to GERAN based on PS handover for mobile-originated calls.

13.2.3 CSFB Based on CCO/NACC During CSFB based on CCO/NACC, the eNodeB receives a CS Fallback Indicator from the MME, and then it sends a Mobility From EUTRA Command message to the UE over the Uu interface. The message contains information about the operating frequency, ID, and system information of a target GERAN cell. It then initiates a CS service in the GERAN. The UE searches for a target cell based on the information it received, and then it performs initial access to the cell to initiate a CS service. If the GERAN or UE does not support DTM, the ongoing PS services of the UE are suspended before a CS service is set up.

Mobile-Originated Call Figure 13-10 shows the procedure for CSFB to GERAN based on CCO/NACC for mobileoriginated calls.

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Figure 13-10 CSFB to GERAN based on CCO/NACC for mobile-originated calls

The UE sends the MME an NAS message Extended Service Request to initiate a CS service.

The MME sends an S1-AP message to instruct the eNodeB to initiate a CSFB procedure. If the MME supports the LAI-related feature, the MME also delivers the LAI to the eNodeB.

The eNodeB determines whether to perform a blind handover based on the UE capabilities, parameters settings, and algorithm policies.

The eNodeB sends a Mobility From EUTRA Command message over the Uu interface to indicate the operating frequency and ID of the target GERAN cell. If the source cell has the system information of the target cell, the system information is also carried in the message. NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 4.5 Decision and 4.6 Execution.

The UE initiates an LAU, a combined RAU/LAU, or both an RAU and an LAU in the target cell.

If DTM is not supported by the UE or GERAN, the ongoing PS services of the UE are suspended.

The UE initiates a CS call establishment procedure in the target GERAN cell.

The eNodeB initiates an S1-based UE context release procedure.

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for the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFB Based on PS Handover. The subsequent steps are the same as the steps in the procedure for CSFB to GERAN based on CCO/NACC for mobile-originated calls.

13.2.4 CSFB Based on Redirection During CSFB based on redirection, the eNodeB receives a CS Fallback Indicator, and then it sends an RRC Connection Release message to release the UE. The message contains information about a target GERAN frequency, reducing the time for the UE to search for a target network. After selecting the GERAN, the UE acquires the system information of a GERAN cell. Then, the UE performs initial access to the cell to initiate a CS service. For the GERAN, the UE is an initially accessing user.

Mobile-Originated Call Figure 13-11 shows the procedure for CSFB to GERAN based on redirection for mobileoriginated calls. Figure 13-11 CSFB to GERAN based on redirection for mobile-originated calls

The procedure is described as follows: 1.

The UE sends the MME a NAS message Extended service request to initiate a CS service.

The MME sends an S1-AP message to instruct the eNodeB to initiate a CSFB procedure. If the MME supports the LAI-related feature, the MME also delivers the LAI to the eNodeB.

The eNodeB determines whether to perform blind handover based on the UE capabilities, parameters settings, and algorithm policies.

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The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection. The message contains information about a target GERAN frequency. Then, the eNodeB initiates an S1 UE context release procedure. NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 4.5 Decision and 4.6 Execution.

The UE may initiate an LAU, a combined RAU/LAU, or both an RAU and an LAU in the target cell.

If the GERAN or UE does not support DTM, the ongoing PS services of the UE are suspended.

The UE initiates a CS call establishment procedure in the target GERAN cell.

Mobile-Terminated Call In a mobile-terminated call, the MSC sends a Paging request message from the CS domain to the MME over the SGs interface, and then the MME or eNodeB initiates a paging procedure for the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFB Based on PS Handover. The subsequent steps are the same as the steps in the procedure for CSFB to GERAN based on redirection for mobile-originated calls.

13.2.5 Flash CSFB During the flash CSFB procedure, the eNodeB receives a CS Fallback Indicator, and then it sends an RRC Connection Release message to release the UE. The message contains information about a target GERAN frequency, as well as one or more physical cell identities and their associated system information. In this way, the UE can quickly access the target GERAN without the need to perform the procedure for acquiring system information of the target GERAN cell. It then initiates a CS service in the GERAN. If the GERAN or UE does not support DTM, the ongoing PS services of the UE are suspended before a CS service is set up. Because flash CSFB complies with 3GPP Release 9, the networks and UEs involved must support 3GPP Release 9 or later.

Mobile-Originated Call Figure 13-12 shows the procedure for CSFB to GERAN based on flash redirection for mobile-originated calls.

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Figure 13-12 CSFB to GERAN based on flash redirection for mobile-originated calls

The UE sends the MME an NAS message Extended Service Request to initiate a CS service.

The MME sends an S1-AP message to instruct the eNodeB to initiate a CSFB procedure. If the MME supports the LAI-related feature, the MME also delivers the LAI to the eNodeB.

The eNodeB determines whether to perform a blind redirection based on the UE capabilities, parameters settings, and algorithm policies.

The eNodeB sends an RRC Connection Release message to instruct the UE to perform a redirection. The message contains information about a target GERAN carrier frequency group, as well as one or more physical cell identities and their associated system information. Then, the eNodeB initiates an S1 UE context release procedure. NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 4.5 Decision and 4.6 Execution. The system information of the target cell is acquired during the RIM procedure.

The UE initiates an LAU, a combined RAU/LAU, or both an RAU and an LAU in the target cell.

If DTM is not supported by the UE or GERAN, the ongoing PS services of the UE are suspended.

The UE initiates a CS call establishment procedure in the target GERAN cell.

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13.2.6 Ultra-Flash CSFB to GERAN Ultra-flash CSFB to GERAN is a Huawei-proprietary procedure. To enable this feature, the MSC, MME, and eNodeB must all be provided by Huawei and support this feature. Resources are prepared in advance on the GERAN using the SRVCC procedure, and authentication and ciphering procedures are excluded to reduce delays. The following figures show ultra-flash CSFB to GERAN of mobile-originated calls and mobile-terminated calls, respectively. Figure 13-13 Ultra-flash CSFB to GERAN for mobile-originated calls

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Figure 13-14 Ultra-flash CSFB to GERAN for mobile-terminated calls

Steps 1 to 3a: The UE initiates voice services (mobile-originated calls and mobile-terminated calls) on the E-UTRAN. The eNodeB triggers SRVCC to GERAN. Special treatment has been applied to the MME and MSC to ensure a proper procedure. Step 3b: The BSC receives an SRVCC request and prepares CS resources. Step 4: The eNodeB receives the handover command transferred over the core network and sends it to the UE. Step 5: The UE is transferred to the GERAN. Steps 6 to 9: The UE establishes voice services on the GERAN. Signaling is carried on the TCH, which accelerates the transfer and reduces delays. As shown in the preceding figures, ultra-flash CSFB to GERAN excludes the following procedures: l

Authentication procedure The UE has been authenticated in the LTE system before CSFB to GERAN.

Ciphering procedure The UE has performed ciphering as instructed during SRVCC. Therefore, the ciphering procedure is not required after the UE is transferred to the GERAN.

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IMEI check procedure The MME has sent the IMEI to the MSC during the preparation for SRVCC. There, the procedure is not required in the GERAN after SRVCC.

CS resource setup procedure The GSM system has prepared CS resources during SRVCC and therefore the UE does not need to reestablish the CS resource after SRVCC. There, the procedure is not required in the GERAN after SRVCC.

If the Fast Return to LTE feature is enabled on the GERAN side, the UE can quickly return to the E-UTRAN when it completes the voice service on the GERAN. To achieve this, the Channel Release message must contain E-UTRA frequency information, based on which the UE selects a suitable E-UTRAN cell to camp on. When IratMeasCfgTransSwitch is set on, the eNodeB filters E-UTRA frequencies supported by the UE based on the UE capability to obtain a frequency set. During the SRVCC procedure, the eNodeB sends the target BSC a Handover Required message containing the frequency set, which serves as a reference for the fast return procedure. When DrxForMeasSwitch is set to ON, the eNodeB supports specific DRX parameters for measurements during the delivery of measurement configurations about GERAN. Measurements are accelerated for UEs that support DRX-based measurements. Other UEs still use the gap-assisted measurement method.

13.2.7 Signaling Procedures for SMS SMS services are unknown to the eNodeB because SMS messages are encapsulated in NAS messages. During interworking with the GERAN, SMS messages are exchanged between the MME and the MSC over the SGs interface. Because a UE does not require fallback to the GERAN to perform an SMS service, the SMS over SGs function can be used in a place covered only by the E-UTRAN. As the SMS service is transparent to the eNodeB, the procedure is not described in this document. For details about the procedure, see section 8.2 in 3GPP TS 23.272 V10.0.0.

13.2.8 Emergency Call The CSFB procedure for an emergency call is the same as the CSFB procedure for a normal mobile-originated voice service. The UE sends an RRC Connection Request message over the Uu interface or the MME sends an Initial Context Setup Request or UE Context Modification Request message, which contains an IE to inform the eNodeB of the service type. Emergency calls take precedence over other services in the eNodeB. If PS handover is used for CSFB for emergency calls, the eNodeB does not restrict the cells in the handover restriction list when selecting the target cell. If redirection is used for CSFB for emergency calls, the Channel Request message that the UE sends when accessing the GERAN contains the indication of a CS emergency call. The GERAN will treat this call as a common CS emergency call. For details about admission and preemption of emergency calls, see Emergency Call.

13.2.9 CSFB for LCS After a UE initiates an LCS request, the MME performs an attach or combined TAU/LAU procedure to inform the UE of the LCS capability of the EPS. If the EPS does not support Issue 02 (2016-04-20)

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LCS, the UE falls back to the GERAN to initiate LCS under the control of the EPS. The CSFB procedure is the same as the procedure for CSFB to GERAN for mobile-originated calls. If the GERAN initiates an LCS request towards a UE camping on an E-UTRAN cell, the MSC sends an LCS indicator to the MME over the SGs interface. Then, the MME instructs the eNodeB to perform CSFB for the UE. The CSFB procedure is the same as the procedure for CSFB to GERAN for mobile-terminated calls. The UE performs the LCS service after the fallback to the GERAN. For details about the CSFB procedure for LCS, see section 8.3 in 3GPP TS 23.272 V10.0.0 and LCS.

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