291514468 zte umts nb amr rate control feature guide by Emerson Rodrigues Setim

NB-AMR Rate Control Feature Guide

NB-AMR Rate Control

NB-AMR Rate Control Version V1.00

Date

Author

2014/02/8

Huang He

Reviewer

Wang Juntao

Notes

First edition

ÂŠ 2014 ZTE Corporation. All rights reserved. ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE. Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.

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TABLE OF CONTENTS 1

Feature Attribute ............................................................................................... 6

2 2.1 2.1.1 2.1.2 2.1.3 2.2 2.3

Overview ............................................................................................................ 6 Feature Introduction ............................................................................................. 6 ZWF21-02-001 CS Conversational RAB for AMR Speech ................................... 8 ZWF21-04-005 AMR Rate Controlling.................................................................. 8 ZWF21-06-002 TrFO ........................................................................................... 9 License Control .................................................................................................. 10 Correlation With Other Features ........................................................................ 10

3 3.1 3.1.1 3.1.2 3.1.3 3.1.4 3.1.5 3.1.6

Technical Description ..................................................................................... 11 ZWF21-02-001 Conversational RAB for AMR .................................................... 11 NB-AMR Rate Selection..................................................................................... 11 Combination of the NB-AMR and PS Services ................................................... 12 NB-AMR Mobility ............................................................................................... 12 Directed Retry of the NB-AMR Service During RAB Assignment ....................... 12 AMR Rate Control After Relocation .................................................................... 13 Default Configuration of NB-AMR Rates: 12.2 kbps, 12.2/7.95/5.9/4.75 kbps, and 7.95 kbps .................................................................................................... 13 RAB Modification of NB-AMR ............................................................................ 14 Signaling Flow of the AMR Service .................................................................... 14 ZWF21-04-005 AMR Rate Controlling................................................................ 17 Classification of AMR Dynamic Rate Adjustment ............................................... 17 AMR Dynamic Rate Adjustment Based on Radio Link Transmit Power .............. 18 Dynamic Adjustment Triggered by Load ............................................................ 24 Dynamic Adjustment Triggered by Resource Congestion .................................. 24 ZWF21-06-002 TrFO ......................................................................................... 25 OoBTC Out of Band Transcoder Control............................................................ 26 Iu UP Initialization .............................................................................................. 27 Iu UP Rate Control ............................................................................................. 28

3.1.7 3.1.8 3.2 3.2.1 3.2.2 3.2.3 3.2.4 3.3 3.3.1 3.3.2 3.3.3 4 4.1 4.2 4.2.1 4.2.2 4.2.3 4.3

Parameters....................................................................................................... 30 ZWF21-02-001 Conversational RAB for AMR .................................................... 30 ZWF21-04-005 AMR Rate Controlling................................................................ 33 Uplink Rate Adjustment Based on the UE Transmitted Power ........................... 33 Downlink Rate Adjustment Based on the Dedicated Measurement of Node B Transmitted Power ............................................................................................. 36 Dynamic Adjustment Triggered by Load and Resource Congestion ................... 43 ZWF21-06-002 TrFO ......................................................................................... 44

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5 5.1 5.2

Related Counters and Alarms ........................................................................ 45 Related Counters ............................................................................................... 45 Related Alarms .................................................................................................. 49

6 6.1 6.1.1 6.1.2 6.1.3 6.2 6.2.1 6.2.2 6.2.3 6.3 6.3.1 6.3.2 6.3.3 6.4 6.4.1 6.4.2 6.4.3 6.5 6.5.1 6.5.2 6.5.3

Engineering Guide .......................................................................................... 49 Application Scenario .......................................................................................... 49 ZWF21-02-001 Conversational RAB for AMR .................................................... 49 ZWF21-04-005 AMR Rate Controlling................................................................ 49 ZWF21-06-002 TrFO ......................................................................................... 49 Feature Activation Procedure ............................................................................. 50 ZWF21-02-001 Conversational RAB for AMR .................................................... 50 ZWF21-04-005 AMR Rate Controlling................................................................ 50 ZWF21-06-002 TrFO ......................................................................................... 57 Feature Validation Procedure ............................................................................ 58 ZWF21-02-001 Conversational RAB for AMR .................................................... 58 ZWF21-04-005 AMR Rate Controlling................................................................ 58 ZWF21-06-002 TrFO ......................................................................................... 59 Feature Deactivation Procedure......................................................................... 59 ZWF21-02-001 Conversational RAB for AMR .................................................... 59 ZWF21-04-005 AMR Rate Controlling................................................................ 59 ZWF21-06-002 TrFO ......................................................................................... 59 Impact on the Network ....................................................................................... 59 ZWF21-02-001 Conversational RAB for AMR .................................................... 59 ZWF21-04-005 AMR Rate Controlling................................................................ 60 ZWF21-06-002 TrFO ......................................................................................... 60

Abbreviations .................................................................................................. 61

Reference Documents..................................................................................... 61

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FIGURES Figure 3-1 Signaling Flow of the AMR Service ...................................................................14 Figure 3-2 Flow of OoBTC Out of Band Transcoder Control ..............................................27 Figure 3-3 Iu UP Initialization .............................................................................................28 Figure 3-4 Flow of Iu UP Rate Control ...............................................................................29 Figure 6-1 Parameter Configuration Interface 1 .................................................................50 Figure 6-2 Parameter Configuration Interface 2 .................................................................51 Figure 6-3 Parameter Configuration Interface 3 .................................................................51 Figure 6-4 Parameter Configuration Interface 4 .................................................................52 Figure 6-5 Parameter Configuration Interface 5 .................................................................53 Figure 6-6 Parameter Configuration Interface 6 .................................................................54 Figure 6-7 Parameter Configuration Interface 7 .................................................................54 Figure 6-8 Parameter Configuration Interface 8 .................................................................55 Figure 6-9 Parameter Configuration Interface 9 .................................................................56 Figure 6-10 Parameter Configuration Interface 10 .............................................................56 Figure 6-11 Parameter Configuration Interface 11 .............................................................57 Figure 6-12 Parameter Configuration Interface 12 .............................................................58

TABLES Table 2-1 NB-AMR Rate Classification ............................................................................... 7 Table 2-2 License Control List ...........................................................................................10 Table 4-1 Parameter Description .......................................................................................30 Table 4-2 Parameter Description .......................................................................................33 Table 4-3 Parameter Description .......................................................................................36 Table 4-4 Parameter Description .......................................................................................43 Table 4-5 Parameter Description .......................................................................................44

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Table 5-1 Counters ............................................................................................................45 Table 6-1 Feature Validation Procedure.............................................................................58 Table 6-2 RNC Parameter .................................................................................................59

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Feature Attribute BSC/RNC version: [ZXUR 9000 UMTS V4.13.10.15/V3.13.10.15] BTS/Node B version: [ZXSDR V4.13.10.20] Attribute: [Optional] Involved NEs: NE Name

Related or Not

Special Requirements

MS/UE

√

UE should support NB-AMR feature.

BTS/Node B

√

None.

BSC/RNC

√

RNC should support NB-AMR feature.

iTC

None.

MSC

None.

MGW

None.

SGSN

None.

GGSN

None.

HLR

√

The UE subscribes to the NB-AMR service.

“√”: involved “-”: not involved

Overview

2.1

Feature Introduction The Adaptive Multi-Rate (AMR) codec provides a high-quality voice service with flexible multi-rate to reach a balance between voice quality and system capability (network load). Currently, 3GPP uses two formats: Narrowband Adaptive Multi-Rate (NB-AMR) and Wideband Adaptive Multi-Rate (WB-AMR), and both of them use the same frame length of 20 ms. For NB-AMR, the voice channel bandwidth is limited to 3.7 kHz and the sampling frequency is 8,000 Hz. For WB-AMR, the voice channel bandwidth is 7 kHz and the sampling frequency is 16,000 Hz. The voice quality of WB-AMR is higher than that of

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NB-AMR. If WB-AMR is required, the UE must support it, and whether a UE supports WB-AMR is indicated in the SETUP uplink direct transfer message from the UE. AMR Control (AMRC) indicates adjusting AMR between different rates in WCDMA systems. Through AMRC, voice rate can be reduced to improve voice quality and reduce system load. AMRC can be used in the following scenarios: 

The load at the downlink air interface exceeds the threshold.



The load at the uplink air interface exceeds the threshold.



Uplink coverage is limited and the AMR rate can be reduced to widen uplink coverage.

When system load is light, AMRC can be used to increase the AMR rate. In this way, QoS is greatly improved. The NB-AMR service has three service RAB sub-flows and can provide eight voice rates and the Silence Descriptor (Comfort Noise Frame). The NB-AMR codec modes related to UMTS_AMR are shown in the following table.

Table 2-1

NB-AMR Rate Classification

AMR

Total Number

Codec Mode

of Bits

Sub-flow 1

Sub-flow 2

Sub-flow 3

AMR 4.75 kbps

AMR 5.15 kbps

103

AMR 5.9 kbps

118

134

148

AMR 7.95 kbps

159

AMR 10.2 kbps

204

244

103

AMR 6.7 kbps (PDC EFR) AMR 7.4 kbps (TDMA EFR)

AMR 12.2 kbps (GSM EFR) AMR SID

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AMR

Total Number

Codec Mode

of Bits

Sub-flow 1

Sub-flow 2

Sub-flow 3

(Comfort Noise Frame) NB-AMR voice coding is divided into three sub-flows in accordance with the importance of information and error tolerance in voice coding. Each sub-flow requires its own QoS assurance. Sub-flow 1 is the most important. Sub-flow 2 comes next. Sub-flow 3 is the least important. Sub-flow 1 requires better channel coding at the air interface to guarantee accuracy. The "no data" rate is coded when there is no voice (mute). SID is used to indicate that voice is not activated currently.

2.1.1

ZWF21-02-001 CS Conversational RAB for AMR Speech ZTE's equipment supports all the eight NB-AMR rates: 12.2 kbps, 10.2 kbps, 7.95 kbps, 7.4 kbps, 6.7 kbps, 5.9 kbps, 5.15 kbps, and 4.75 kbps, and also supports DTX and SID. The RAB parameters of ZTE's RAN, used to bear AMR services, are configured in accordance with 3GPP TS 34.108.

2.1.2

ZWF21-04-005 AMR Rate Controlling In a WCDMA system, the radio conditions between a UE and the base station always change. When the UE is far from the base station or the radio conditions are poor, the base station or the UE must have greater transmit power under the closed-loop power control to guarantee the QoS of the AMR service. The increase of the power may result in further deterioration of radio conditions. As a result, system capacity decreases and the QoS requirements of the service cannot be met even when the power is increased to the maximum value. ZTE's RNC can monitor the uplink transmit power contained in the UE internal measurement report or the downlink transmit power contained in the NodeB-dedicated measurement report. When the uplink or downlink transmit power rises to a threshold, the RNC automatically adjusts the UE's NB-AMR rate to reduce the power required for the service. This indicates that voice quality is reduced to retain calls. When the radio conditions between a UE and the base station are good and the transmit power of the

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base station or the UE decreases to a threshold, the AMR rate can be increased to provide the UE with higher voice quality when the system is neither overloaded nor congested. In addition, when the downlink and uplink load of a cell is high in accordance with its downlink transmit power and uplink interference, ZTE's RNC can lighten the cell load by reducing the NB-AMR rate of some UEs with low priorities so that more UEs can be supported. The RNC can only adjust the NB-AMR rates belonging to the NB-AMR code set configured by the CN for UEs during call establishment. The voice quality when low-rate AMR coding is used is lower than that when high-rate AMR coding is used but the capacity (number of UEs) is higher and the coverage is wider. The simulation result shows that when the lowest NB-AMR (4.75 kbps) is used instead of the highest NB-AMR (12.2 kbps), the coverage radius gain is about 30% and the UEs supported by the cell may increase by 100%.

2.1.3

ZWF21-06-002 TrFO WCDMA systems use AMR compressed voice coding. In the R99 phase, a TDM bearer is used between CS core network devices, and 64 kbit/s PCM coding must be used for voice. Voice Transcoder (TC) is an important function of the R99 MSC, converting the AMR voice codes of mobile terminals into PCM codes and transmits them over the network. The calls between mobile users require two voice code conversions (AMR-PCM-AMR). Frequent encoding and decoding reduce voice quality. Therefore, 3GPP introduced Tandem Free Operation (TFO) and Transcoder Free Operation (TrFO) in the R4 protocol to avoid voice encoding and decoding. With these two technologies, the transmission network bandwidth between core networks can be saved. The differences between the technologies are as follows: TFO needs TC resources. After a call is established, a direct connection is established between the TCs of the calling and called MSCs through in-band signaling negotiation to bypass encoding and decoding. TrFO does not need TC resources. This indicates that Out of Band Transcoder Control (OoBTC) is used during call establishment to perform consistent voice encoding and decoding negotiation between the UE and the network.

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The TFO technology is used on core network devices without the RAN. The TrFO technology requires that the RAN should support out-band voice encoding negotiation and the processing related to the user plane. ZTE's RAN supports the TrFO function and complies with 3GPP TS 23.153 and TS 25.415.

2.2

License Control Table 2-2

License Control List

Feature ID ZWF21-02-001

Feature Name CS Conversational RAB for AMR Speech

ZWF21-04-005

AMR Rate Controlling

License

Configured

Control Item

N/A AMR Rate Controlling

ZWF21-06-002

2.3

TrFO

N/A

Unit

N/A

RNC

N/A

Correlation With Other Features 1.

Required Features None.

Mutually Exclusive Features None.

Affected Features None.

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Technical Description

3.1

ZWF21-02-001 Conversational RAB for AMR

3.1.1

NB-AMR Rate Selection The 3GPP specifications define eight voice rates and one SID for UMTS NB-AMR, and the highest voice rate supported is 12.2 kbps.

3.1.1.1

RAB Assignment ZTE's RNC determines the NB-AMR rate set according to the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message. If the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message is 1, the available rates for the service are determined by the intersection of the configured rate set on the RNC and the received MBR and GBR from the CN. The related parameters

are

ULogicalRnc.amrNbMode0UseTag

(4.75

kbps),

ULogicalRnc.amrNbMode1UseTag (5.15 kbps), ULogicalRnc.amrNbMode2UseTag (5.9 kbps),

ULogicalRnc.amrNbMode3UseTag

(6.7

kbps),

ULogicalRnc.amrNbMode4UseTag (7.4 kbps), ULogicalRnc.amrNbMode5UseTag (7.95 kbps),

ULogicalRnc.amrNbMode6UseTag

(10.2

kbps),

and

ULogicalRnc.amrNbMode7UseTag (12.2 kbps), which indicate whether the rates are supported on the RNC. If the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message is 2, the RNC supports all the NB-AMR rates assigned by the CN. If the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message is 3 and ULogicalRnc.IntraRatV1V2AmrCut is set to cut, the processing on the RNC side is the same as that when UP Mode Versions is set to 1. If the value of UP Mode Versions in

the

RAB

ASSIGNMENT

REQUEST

message

and

ULogicalRnc.IntraRatV1V2AmrCut is set to not cut, the processing on the RNC side is the same as that when UP Mode Versions is set to 2.

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3.1.1.2

GBR Reservation for the AMR Service ZTE's RNC can be used to determine whether the GBR should be contained in the NB-AMR rate set. When the value of UP Mode Versions in the RAB ASSIGNMENT REQUEST message is 1 or the value of UP Mode Versions is 3 and ULogicalRnc.IntraRatV1V2AmrCut is set to cut, the NB-AMR rates configured by the RNC may be different from the NB-AMR rate set assigned by the CN in the RAB ASSIGNMENT REQUEST message. To avoid the problem that the RNC does not support the GBR in the RAB ASSIGNMENT REQUEST message, you can set ULogicalRnc.amrGbrResInd to determine that the GBR in the RAB ASSIGNMENT REQUEST message must be contained in the supported rate set. If ULogicalRnc.amrGbrResInd is set to 1: True, the actual NB-AMR rate set contains the intersection of the above two AMR rate sets and the GBR in the RAB ASSIGNMENT REQUEST message. If ULogicalRnc.amrGbrResInd is set to 0: False, the actual NB-AMR rate set is the intersection of the above two AMR rate sets. The GBR used on the RNC is the lowest rate among the rates (in the NB-AMR rate set) larger than or equal to the GBR in the RAB ASSIGNMENT REQUEST message.

3.1.2

Combination of the NB-AMR and PS Services ZTE's RNC supports the NB-AMR service and the combination of the NB-AMR and PS services.

3.1.3

NB-AMR Mobility ZTE's RNC supports the soft handover, hard handover, and relocation of the NB-AMR service, and the handover between the 2G and 3G systems.

3.1.4

Directed Retry of the NB-AMR Service During RAB Assignment The RNC supports the directed retry of the NB-AMR service during RAB assignment. If the load of the cell where the UE resides is too heavy during RAB assignment, the UE is

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directed to a 2G system. For details, refer to the ZTE UMTS Directed Retry to GSM Feature Guide.

3.1.5

AMR Rate Control After Relocation Due to UE compatibility problems, some UEs become mute if the NB-AMR service rate is changed after inter-RNC soft handover or hard handover relocation. Therefore, URncInfo.IntraRlocAmrRtCtrl is used to control whether the NB-AMR service rate can be changed after the relocation. If URncInfo.IntraRlocAmrRtCtrl is set to 0: AMR Rate Changing is Allowed after Relocation or the NB-AMR service rate before relocation is not contained in the Relocation Request message, or the Iu UP version is V2, the NB-AMR service rate can be changed after inter-RNC relocation. The methods that determine the NB-AMR service rate set and the actual NB-AMR service rate after relocation are described in other sections of this manual. If URncInfo.IntraRlocAmrRtCtrl is set to 1: AMR Rate Changing is Not Allowed after Relocation, the NB-AMR service rate before relocation is contained in the Relocation Request message, and the Iu UP version is V1, the NB-AMR service rate cannot be changed after inter-RNC relocation. The NB-AMR service rate set only contains the NB-AMR service rates smaller than or equal to the actual NB-AMR service rate before relocation, and the actual NB-AMR service rates before and after relocation are the same.

3.1.6

Default Configuration of NB-AMR Rates: 12.2 kbps, 12.2/7.95/5.9/4.75 kbps, and 7.95 kbps The RNC supports the default configuration of the following NB-AMR rates: 12.2 kbps, combinations of 12.2, 7.95, 5.9, and 4.75 kbps, and 7.95 kbps for the handover from the 2G system to the 3G system. The RNC determines the default configuration according to the MBR and GBR in the Relocation Request message received from the CN, establishes the bearer according to the default configuration, sets the default cells in the HANDOVER TO UTRAN COMMAND message, and sends this message to the UE through the 2G network.

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3.1.7

RAB Modification of NB-AMR The RNC supports RAB modification for the NB-AMR service that the CN initiates by sending the RAB ASSIGNMENT REQUEST message. The CN initiates RAB modification for the NB-AMR service when the TFO or TrFO conditions are satisfied after handover, call forwarding, and intelligent services.

3.1.8

Signaling Flow of the AMR Service The following figure shows the establishment flow of the NB-AMR service in synchronous mode.

Figure 3-1

Signaling Flow of the AMR Service

Node B Serving RNS

Serving RNC

RANAP

1. RAB Assignment Request

RANAP

[Establishment] Select L1, L2 and Iu Data Transport Bearer parameters 2. ALCAP Iu Data Transport Bearer Setup Not required towards PS domain

NBAP

3. Radio Link Reconfiguration Prepare [DCH Addition]

NBAP

4. Radio Link Reconfiguration Ready

NBAP

5. ALCAP Iub Data Transport Bearer Setup

DCH-FP

6. Downlink Synchronisation

DCH-FP

7. Uplink Synchronisation DCH-FP

NBAP

DCH-FP

8. Radio Link Reconfiguration Commit

NBAP

9. DCCH : Radio Bearer Setup RRC

RRC Apply new transport format set

RRC

10. DCCH : Radio Bearer Setup Complete

RRC

RANAP

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11. RAB Assignment Response

RANAP

NB-AMR Rate Control

The CN initiates the establishment of a radio access bearer by sending the RANAP message Radio Access Bearer Assignment Request. The important parameters for the CS service are as follows:



(Optional) NAS Synchronization Indicator indicates the speech codec type selected by the CN. The RNC passes this cell to the UE. The codec types related to UMTS AMR are displayed in the following table. For details, refer to 3GPP 26.103. If the UE does not receive this cell during the establishment of a voice call or the inter-system handover of a voice call to the UTRAN, the UMTS_AMR_2 speech codec is used by default. UMTS_AMR_2 is compatible with GSM FR AMR. Bit 8…Bit 1

Codec_Type

Name

CoID (Codec Identification) 0000.0101

UMTS Adaptive Multi-Rate

UMTS AMR

0000.0110

UMTS Adaptive Multi-Rate

UMTS AMR 2

2 0000.1010

UMTS Adaptive Multi-Rate

UMTS WB-AMR

Wide Band 

RAB parameters (including QoS) include the following parameters: 

Traffic Class, value: conversational



MBR (Maximum Bit Rate), unit: bit/s



GBR (Guaranteed Bit Rate), unit: bit/s



Delivery Order, value: provide in-sequence SDU delivery (for the AMR service)





SDU parameters, describing the three RAB sub-flows of the AMR service



Source Statistics Descriptor, value: speech (for the AMR service)



Allocation/Retention Priority

User plane Information parameters:

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

User Plane Mode, value: support mode for predefined SDU sizes (for the AMR service).



UP Mode Versions indicates the user plane version supported by the CN, containing 16 bits. Each bit indicates a user plane version, and a maximum of 16 user plane versions can be displayed. The highest bit indicates version 16 and the lowest bit indicates version 1. For support mode for predefined SDU sizes, version 1 and version 2 are defined in the current version (release 99).



Transport layer information parameters include Transport Address and Iu Transport Association.

The SRNC initiates the establishment of the Iu data transport bearer by sending the ALCAP message. This message contains the AAL2 binding identity, which is used to bind the Iu data transport bearer to the radio access bearer.

The SRNC requests its NodeB to prepare the establishment of DCH to support the radio access bearer (Radio Link Reconfiguration Prepare). The parameters include Transport Format Set, Transport Format Combination Set, and power control information parameters.

The NodeB allocates resources and notifies the SRNC that the radio link reconfiguration is ready (Radio Link Reconfiguration Ready). The parameters include the transport layer addressing information (AAL2 address and AAL2 Binding ID) for the Iub data transport bearer.

The SRNC initiates the establishment of the Iub data transport bearer by sending the ALCAP message. This message contains the AAL2 binding identity, which is used to bind the Iub data transport bearer to DCH.

The NodeB and the SRNC use the Iub or Iur data transport bearer to exchange the DCH frame protocol message Downlink Synchronization to synchronize the Iub or Iur interface.

The NodeB and the SRNC use the Iub or Iur data transport bearer to exchange the DCH frame protocol message Uplink Synchronization to synchronize the Iub or Iur interface.

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The NBAP message Radio Link Reconfiguration Commit is sent from the SRNC to the NodeB.

The RRC message Radio Bearer Setup is sent from the SRNC to the UE. The parameters include Transport Format Set and Transport Format Combination Set.

10 The UE sends the RRC message Radio Access Bearer Setup Complete to the SRNC. 11 The SRNC sends the RANAP message Radio Access Bearer Assignment Response to the CN

3.2

ZWF21-04-005 AMR Rate Controlling

3.2.1

Classification of AMR Dynamic Rate Adjustment The RNC supports dynamic rate adjustment for the AMR service triggered by link-level transmit power, resource congestion, and load control during calls. If the rate adjustment threshold is reached, the uplink rate is controlled by the RNC through the TFC control command, and the downlink rate is controlled by the RNC through the Iu UP reverse rate control frame. The NB-AMR dynamic rate adjustment is controlled by the ULogicalRnc.amrRncAdjust parameter. There are three types of AMR dynamic rate adjustment depending on the trigger mechanisms: ď Ź

NB-AMR dynamic rate adjustment based on link-level transmit power

Due to inner-loop power control, the uplink/downlink link-level transmit power vary with the change of the radio conditions of the transmitting antennas of the UE and the NodeB. When the radio conditions degrade, the RNC should reduce the NB-AMR rate to reduce transmit power to avoid heavy uplink/downlink load of the cell. When the transmit power of the NB-AMR link is low and the system load is light, the RNC can increase the

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NB-AMR rate to maximize the utilization of system resources to provide users with better voice quality. 

NB-AMR rate adjustment triggered when uplink/downlink resources are congested or the cell is overloaded

Reduce the rate of the uplink/downlink AMR service to reduce uplink/downlink resource congestion. 

Initial NB-AMR rate adjustment triggered when the cell is overloaded or the UE is a poorly covered area

When the cell is overloaded or the UE is in a poorly covered area, the initial and the highest AMR service rates should be reduced to lighten cell load and improve link performance. For details, refer to the ZTE UMTS Adaptive Radio Bearer Feature Guide. For these three trigger mechanisms, ZTE's RNC can only adjust the rate of the NB-AMR service in the range of NB-AMR rates.

3.2.2

AMR Dynamic Rate Adjustment Based on Radio Link Transmit Power

3.2.2.1

Uplink Rate Adjustment Based on UE Transmit Power

3.2.2.1.1

Measurement Quantity The AMR rate adjustment in uplink is base on the UE internal measurement reports of UE TxP (Transmitted Power). There are two kinds of event, Event 6a and Event 6b. UAmrEvtTPUeInt.meaEvtId defines the UE internal event identity. 

Event 6a: when the UE TxP measurement value is greater than a certain absolute threshold and this condition lasts for the duration TriggerTime6A, the Event 6a is reported

the

UE.

TriggerTime6A

defined

the

parameter

UAmrEvtTPUeInt.trigTime[0]. 

Event 6b: when the UE TxP measurement value is smaller than a certain absolute threshold and this condition lasts for the duration TriggerTime6B, the Event 6b is

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reported

the

UE.

TriggerTime6B

defined

the

parameter

UAmrEvtTPUeInt.trigTime[1]. The parameters for 6a and 6b can be configured at cell level. The number of internal measurement events is configured by UAmrEvtTPUeInt.measEvtNum. It can be set to “2”, for Event 6a and 6b. To facilitate the description, it is assumed that 0 represents 6a and 1 represents 6b. The UE Txp threshold of Event 6a/6b (UAmrEvtTPUeInt.txPowerThres) is a delta value relative to maximum UE TX power which is determined by the formula “min (UE maximum

transmitted

power

determined

power

class,

USrvDivPc.maxUlDpchPwr)”. USrvDivPc.maxUlDpchPwr is the maximum transmitted power determined by the sub-service type of NB-AMR service.. And the UE maximum transmitted power determined by the UE power class is listed as follows. Power Class

maximum output power of

+24

+21

the UE (dBm) The absolute UE TxP thresholds of Event 6a and 6b are as follows. AMR_6a = maximum UE TX power + UAmrEvtTPUeInt.txPowerThres[0] AMR_6b = maximum UE TX power + UAmrEvtTPUeInt.txPowerThres[1] The correspondence between other parameters that need to be filled in UE internal measurement control message and OMC configuration is described as follows. Firstly “Used UUeIntMeasProfile” (UUtranCellFDD.refUUeIntMeasProfile) of the cell is obtained from the management object “UTRAN Cell Object”(UUtranCellFDD). Secondly. from the value

UUtranCellFDD.refUUeIntMeasProfile,

the

corresponding

profile

ID(UueIntMeasProfile.profileId) of the UUtranCellFDD’s child management object “UE Internal Measurement Profile Object” (UueIntMeasProfile), which is used by the cell, is obtained. And thirdly, from the child management object UueIntMeasProfile, which is identified

the

UueIntMeasProfile.profileId,

the

corresponding

Internal

Measurement parameter based on the measurement target is obtained. UE Internal Measurement Configuration Index

UAmrEvtTPUeInt.ueIntMCfgNo

Measurement report transmission mode

UAmrEvtTPUeInt.measRptTrMod

ZTE Confidential Proprietary

NB-AMR Rate Control

UE Internal Measurement Configuration Index

UAmrEvtTPUeInt.ueIntMCfgNo

Filter coefficient

UAmrEvtTPUeInt.filterCoeff

Maximum Event Number of UE Internal Measurement

3.2.2.1.2

UAmrEvtTPUeInt.measEvtNum

UE Internal Measurement Event Identity

UAmrEvtTPUeInt.meaEvtId

Time to Trigger

UAmrEvtTPUeInt.trigTime

UE Transmitted Power Threshold

UAmrEvtTPUeInt.txPowerThres

Rate Control Principles If ULogicalRnc.amrRncAdjust is On and the number of uplink NB-AMR rates is larger than 1, UE TxP measurement is enabled. Otherwise, UE TxP measurement is disabled. The operating principles are as follows: ď Ź

If the uplink transmit power reported by the UE exceeds the threshold (AMR_6a) and the current uplink NB-AMR rate is not the lowest rate, the NB-AMR rate level must be reduced by one. After the uplink NB-AMR rate level is reduced, a new measurement control command is sent to the UE.

ď Ź

If the uplink transmit power reported by the UE is lower than the threshold (AMR_6b), the current uplink NB-AMR rate is not the highest rate, and the system is neither overloaded nor congested with uplink load, the NB-AMR rate level must be increased by one. After the uplink NB-AMR rate level is increased, a new measurement control command is sent to the UE.

For TrFO connection mode, the following operations must be also performed: If the target NB-AMR rate is smaller than or equal to the highest uplink rate of the Iu interface, the rate can be increased. Otherwise, the uplink rate cannot be increased. When the RNC receives the rate control command from the CN, the highest rate is the uplink target rate required by the CN. The RNC determines whether the target rate can be adjusted by the current RNC according to cell uplink load and the UE transmit power measurement report. If the target rate can be adjusted by the RNC, the RNC returns the rate control response command containing the rate to the peer end. At the same time, the RNC sends the TFC control command to the UE, requiring that the UE uplink rate

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NB-AMR Rate Control

should be adjusted to the target rate. If the target rate cannot be adjusted by the RNC, the RNC sends a Rate Control NACK message to the CN.

3.2.2.2

Downlink Rate Adjustment Based on the Dedicated Measurement of Node B Transmit Power

3.2.2.2.1

Measurement Quantity The downlink NB-AMR rate adjustment is based on the D-TCP (Dedicated Transmitted Code Power) measurement report from Node B. It indicates that the downlink transmitted power for the UE (the TCP on the given carrier, given scramble, and given channelization code) is measured by the Node B. The Node B dedicated TCP measurement for the NB-AMR rate control is reported periodically and the period is configured by UNbDedMeas.RptPrd. Whether the criterion for Event A or Event B is met is determined by the RNC. Event A and Event B are defined as follows: ď Ź

Event A: when the Node B D-TCP measurement value is greater than a specific absolute threshold AMR_A for the duration TriggertimeA, the Event A is triggered. When the criterion of Event A is met, the downlink transmitted power for a certain UE is considered to be in a high power status, and the downlink rate could be decreased.

ď Ź

Event B: when the Node B D-TCP measurement value is smaller than a specific absolute threshold AMR_B for the duration TriggertimeB , the Event B is triggered. When the criterion of Event B is satisfied, the downlink transmitted power for a certain UE is considered to be in a low power status, and the downlink rate could be increased.

The definition of AMR_A and AMR_B are as followed. AMR_A = USrvDivPc.maxDlDpchPwr + evtAbTcpThrd_A AMR_B = USrvDivPc.maxDlDpchPwr + evtAbTcpThrd_B Where

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NB-AMR Rate Control

USrvDivPc.maxDlDpchPwr is the maximum downlink DPCH transmitted power for NB-AMR service. The detailed description refers to ZTE UMTS Power Control Feature Guide.

evtAbTcpThrd_A is defined by the parameter UNbDedMeas.evtAbTcpThrd[0] indexed by UNbDedMeas.nbDMCfgNote =7

evtAbTcpThrd_B is defined by the parameter UNbDedMeas.evtAbTcpThrd[0] indexed by UNbDedMeas.nbDMCfgNote =8

The correspondence between other parameters that need to be filled in dedicated measurement initiation request message and OMC configuration is described as follows. Firstly

the

Profile

for

the

NodeB

dedicated

measurement

(UNbDedMeasProfile.profileId) of the cell is obtained from the management object “UNbDedMeasProfile”. Secondly, from the value of UNbDedMeasProfile.profileId, the corresponding

child

management

Configuration”(UnbDedMeas)

object found.

“NodeB

Dedicated

Thirdly,

The

Measurement corresponding

UNbDedMeas.nbDMCfgNote could be obtained according to the measurement purpose. And finally the parameters for the measurment are obtained according to the value of UNbDedMeas.nbDMCfgNote. Dedicated Measurement Type

UNbDedMeas.dedMeasType

Measurement Filter Coefficient

UNbDedMeas.measFilterCoeff

Report Characteristics

UNbDedMeas.rptType

Measurement Threshold of Event A/B for Transmitted Code Power

UNbDedMeas.evtAbTcpThrd

Measurement Change Time/Measurement Hysteresis Time

UNbDedMeas.evtAbcdefTime

Choice Report Periodicity Scale

UNbDedMeas.rptPrdUnit

Report Period

UNbDedMeas.rptPrd

DPCH Maximum DL Power

USrvDivPc.maxDlDpchPwr

Event A Counter Threshold for PS on DL DCH or DL AMR Decreasing Rate Based on D-TCP

UDrbc.dtcpEaThd

Event B Counter Threshold for Restriction PS Increasing Rate on DL DCH or Triggering DL AMR Increasing Rate Based on D-TCP

ZTE Confidential Proprietary

UDrbc.dtcpEbThd

NB-AMR Rate Control

3.2.2.2.2

Rate Control Principles If ULogicalRnc.amrRncAdjust is On and the number of downlink NB-AMR rates is larger than 1, DTCP measurement is enabled. Otherwise, NodeB-dedicated TCP measurement is disabled. The basic principles are as follows: 

When the special downlink transmit power reported by the NodeB exceeds the threshold (AMR_A) UDrbc.dtcpEaThd times consecutively and the current downlink NB-AMR rate is not the lowest rate, the downlink NB-AMR rate level must be reduced by one.



When the special downlink transmit power reported by the NodeB is lower than the threshold (AMR_B) UDrbc.dtcpEbThd times consecutively, the current downlink NB-AMR rate is not the highest rate, and the system is neither overloaded nor congested with downlink load, the downlink NB-AMR rate level must be increased by one.

For TrFO connection mode, the downlink rate depends on the downlink rate of the Iu interface. In a mobile-to-mobile call, the downlink rate depends on the uplink rate of the peer end. Therefore, the downlink NB-AMR rate adjustment algorithm is changed as follows in comparison with the non-TrFO connection mode: 

When the local end needs to adjust the downlink NB-AMR rate, the RNC sends the adjusted target rate through the rate control command to the CN, and the CN sends this rate through the rate control command to the peer RNC. The returned rate control response command contains the highest uplink rate supported by the peer end. The peer UE sends data at the smaller rate between the highest uplink rate supported by the peer end and the target rate required by the local end. In this way, the downlink rate of the local end is adjusted.



When the uplink rate of the peer end is reduced, the downlink rate of the local end is reduced accordingly.



When the uplink rate of the peer end is increased, the downlink rate of the local end is increased accordingly, resulting in the change of the downlink load of the cell and the downlink D-TCP of the link. The RNC should determine whether to reduce the

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NB-AMR Rate Control

increasing downlink rate according to the downlink load of the cell and the downlink D-TCP measurement report. If the downlink rate must be reduced, the RNC sends the rate control command to the CN, containing the highest rate supported by the local end. In this way, the downlink rate of the Iu interface is controlled.

3.2.3

Dynamic Adjustment Triggered by Load In case of uplink or downlink overload in a cell, the RNC must reduce the rates of AMR services in accordance with their priorities. When the cell is not overloaded and the NB-AMR services whose rates are reduced meet the conditions described in section 3.3.2 Iu UP Initialization, the RNC increases their rates level by level. When the switch of forbidding AMR downgrade is turned on (URncInfo.loadForAmrSwit is 1: forbidden), the AMR downgrade triggered by load control is not performed. If URncInfo.loadForAmrSwit is 0, the original load control downgrade policy is recovered. For details, refer to the ZTE UMTS Overload Control Feature Guide.

3.2.4

Dynamic Adjustment Triggered by Resource Congestion In case of uplink or downlink resource congestion, the RNC must reduce the rates of AMR services in accordance with their priorities. When uplink or downlink resources are not congested and the NB-AMR services whose rates are reduced meet the conditions described in section 3.3.2 Iu UP Initialization, the RNC increases their rates level by level. When the switch of forbidding AMR downgrade is turned on (URncInfo.loadForAmrSwit is 1: forbidden), the AMR downgrade triggered by congestion control is not performed. If URncInfo.loadForAmrSwit is 0, the original congestion control downgrade policy is recovered. For details, refer to the ZTE UMTS Congestion Control Feature Guide.

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NB-AMR Rate Control

3.3

ZWF21-06-002 TrFO In the R99 phase, 64 kbit/s PCM coding is used based on the TDM bearer in the CN CS domain. Therefore, the R99 MSC must have the voice TC function. However, voice quality may be reduced after encoding or decoding. The calls between mobile users need dual voice encoding and decoding. If no codec is used, voice quality can be improved and network bandwidth can be saved. In the R4 phase, a TrFO connection can reduce the number of times that voice encoding and decoding are performed. The TrFO connection can be established throughout the end-to-end process or between the nodes of a call connection. For example, for a call between a UMTS UE and a fixed telephone, the TrFO connection only exists between the UMTS UE and the core network. The core network and the RNC in the TrFO connection must support Iu UP V2. Otherwise, no TrFO connection can be established. ZTE supports both Iu UP V1 and Iu UP V2, and the RNC is selected according to CN RAB assignment parameters. The TrFO is implemented through Out of Band Transcoder Control (OoBTC). It is applicable to the calls between mobile networks and those between a mobile network and an external network. When the same voice encoding or decoding type is used between both call parties or between one call party and a node in the call connection, the TrFO can transparently transmit the compressed voice, and this improves voice quality and saves transmission bandwidth. The nodes connected with a TrFO connection use the same common compressed voice encoding type negotiated in the OoBTC phase. A codec must be inserted between a TrFO connection and a non-TrFO connection to convert encoding types. The implementation strategy of the core network ensures that the insertion position can meet the following requirements: ď Ź

The insertion position should reduce the number of times that TC (transcoder) is used and improve voice quality;

ď Ź

The insertion position should save transmission bandwidth. This indicates that it should prolong the connection that uses compressed voice encoding data for transmission.

ZTE Confidential Proprietary

NB-AMR Rate Control

During Iu UP initialization, if the CN supports both Iu UP version 1 and version 2, ZTE's RNC uses URncFunction.intraRatV1V2AmrCut to determine whether to cut NB-AMR rates according to the RNC capability between the CN and the RNC in the RAB assignment procedure and inter-RNC relocation procedure, and ZTE's RNC uses URncFunction.interRatV1V2AmrCut to determine whether to cut NB-AMR rates according to the RNC capability between the CN and the RNC in the inter-RAT relocation procedure. For a UTRAN, its Iu UP initialization, reverse initialization, Iu UP rate control, and Iu UP reverse rate control are related to the TrFO process.

3.3.1

OoBTC Out of Band Transcoder Control When a call is initiated, both call parties negotiate the codec to establish a TrFO operation. The O-MSC sends an IAM message containing the supported codec type list to a transmission network. The transmission network deletes the codec types that are not supported from the list and sends it to a T-MSC. The T-MSC also deletes the codec types that are not supported from the list and then selects an optimal common codec type. The T-MSC returns the codec type to the transmission network and the O-MSC, and notifies them of the selected codec type. In the meantime, the T-MSC returns the codec type that the Terminating UE supports to the O-MSC and begins to establish a bearer based on this codec. This flow is shown in the following figure.

ZTE Confidential Proprietary

NB-AMR Rate Control

Figure 3-2

Flow of OoBTC Out of Band Transcoder Control

O-MSC

T-MSC

Transit Transit MGW

O-MGW

T-MGW

Codec List (v, w, x, y, z) Codec List (v, w, x, z) Selected Codec = v Selected Codec = v, Available List (v, x, z, ) Selected Codec = v, Available List (v, x, z, )

Selected Codec = v

Selected Codec = v Bearer Established

Bearer Established

The encoding type that the UE supports is transparently transmitted to the RNC as follows: Uplink Direct Transfer -> NAS Message -> Bearer Capacity, and then the RNC transparently transmits the encoding type to the MSC server as follows: Direct Transfer -> NAS Indicator -> Bearer Capacity. During RAB assignment, the encoding/decoding type lists of the calling and called parties are completely the same.

3.3.2

Iu UP Initialization The purpose of Iu UP initialization is to define the mapping relationship (used in the data transmission phase) between the RNC and the CN on both sides of Iu UP, including RAB sub-flow combination, RFCIs, and SDU size of the related RAB sub-flow. If a bearer is successfully established, the CN delivers an RAB assignment request message to the RNC. The RNC in the R4 version must support all the SDU sub-flow combinations in the RAB assignment request message. This indicates that the content in the initialization frame is a universal set of sub-flow combinations determined by RAB assignment. Therefore, the initialization frame is only used to negotiate Iu UP version

ZTE Confidential Proprietary

NB-AMR Rate Control

information and RFCI correspondence (each RFCI corresponds to a sub-flow combination). In the R99 version, this initialization process can only be performed when the RNC receives an RAB assignment, modification, or RNC relocation request. In the R4 version, the CN can also perform this initialization process, which is called Iu UP reverse initialization. The following figure shows Iu UP initialization.

Figure 3-3

Iu UP Initialization

RNC/ CN *

CN/ RNC

INITIALISATION 2) ((RFCI, SDU sizes[, IPTIs ])m ) INITIALISATION ACK Transfer Of User Data

* can be repeated N INIT times 2)

optional

In the RFCI set determined during Iu UP initialization, the rate that corresponds to the first RAB sub-flow combination is the highest rate in the initialization response direction permitted by the local end when data transmission begins. The highest rate must be higher than the guaranteed rate and SID rate. The highest rate can be modified during Iu UP rate control after Iu UP initialization. The rates higher than the guaranteed rate are called controllable rates, and the rates lower than the guaranteed rate cannot be modified.

3.3.3

Iu UP Rate Control The purpose of Iu UP rate control is to notify the peer Iu UP protocol layer of the highest rate at the Iu interface in the reverse direction of the rate control frame. In the R4 version, Iu UP rate control can be initiated by the RNC or the CN. In the R99 version, Iu UP rate control can only be initiated by the RNC. As long as an Iu UP entity is not suspended by other control flows, it can initiate rate control. The controlled rates are all included in the RFC set determined during Iu UP initialization. These rates that correspond to the RFC should be higher than the

ZTE Confidential Proprietary

NB-AMR Rate Control

guaranteed rate. Rate control cannot be implemented when the SID rate and the RFC are lower than the guaranteed rate because they cannot be prohibited.

Figure 3-4

Flow of Iu UP Rate Control

RNC/ CN

CN/ RNC RATE CONTROL (RFCI indicators) RATE CONTROL ACK (RFCI indicators)

Note: The rate control frame describes the limits of an RFC set, hereinafter called the "RFC limit set". In downlink direction, the RNC triggers the rate control frame, records the "RFC limit set" (downlink direction), and monitors the operations of the CN. If the CN sends the data frame of the limited RFCI, the rate control frame must be resent. In uplink direction, the Iu UP module of the RNC receives the rate control frame and implements the limit through TFC control. The rate control initiated by the CN is as follows: After receiving a rate control message from the RNC, the CN initiates rate control to the other party of the call to limit or open the other party's uplink AMR level, or the CN initiates a rate adjustment flow according to the TrFO. For example, during SRNS relocation, the CN performs reverse initialization first after a new RNC sends relocation detection to the CN, and then the new RNC initiates a process called immediate initialization. This aims at negotiating the highest rate for data transmission between two Iu UP entities supporting TrFO. The rate control initiated by the RNC is as follows: During the dynamic AMR process, the RNC adjusts the downlink AMR level according the downlink load of a cell or the dedicated TCP measurement of an RL and initiates rate control. Compared with the encoding and decoding type negotiation before initialization, Iu UP rate control is in-band rate control.

ZTE Confidential Proprietary

NB-AMR Rate Control

Parameters

4.1

ZWF21-02-001 Conversational RAB for AMR Table 4-1

Parameter Description

Parameter Name

GUI Name

Parameter Description

This

Value Range

Unit

Default Value

Recom mende d Value

parameter

indicates whether the RNC ULogicalRnc.a mrNbMode0Us eTag

AMR_NB 4.75k Use Tag

supports

AMR

4.75 kbps in Iu UP 0:Not version 1. It is used in Used the

user

N/A

plane 1: Used

0:Not

Used

0:Not

Used

0:Not

Used

0:Not

Used

initialization process of RAB establishment or SRNS relocation. This

parameter

indicates whether the RNC ULogicalRnc.a mrNbMode1Us eTag

AMR_NB 5.15k Use Tag

supports

AMR

5.15 kbps in Iu UP 0:

Not

version 1. It is used in Used the

user

N/A

plane 1: Used

initialization process of RAB establishment or SRNS relocation. This

parameter

indicates whether the RNC ULogicalRnc.a mrNbMode2Us eTag

AMR_NB 5.90k Use Tag

supports

AMR

5.90 kbps in Iu UP 0:

Not

version 1. It is used in Used the

user

N/A

plane 1: Used

initialization process of RAB establishment or SRNS relocation. ULogicalRnc.a AMR_NB This parameter 0: Not N/A mrNbMode3Us 6.70k Use Tag indicates whether the Used

ZTE Confidential Proprietary

NB-AMR Rate Control

Parameter Name

GUI Name

eTag

Parameter Description RNC

supports

Value Range

Unit

Default Value

Recom mende d Value

AMR 1: Used

6.70 kbps in Iu UP version 1. It is used in the

user

plane

initialization process of RAB establishment or SRNS relocation. This

parameter

indicates whether the RNC ULogicalRnc.a mrNbMode4Us eTag

AMR_NB 7.40k Use Tag

supports

AMR

7.40 kbps in Iu UP 0:

Not

version 1. It is used in Used the

user

N/A

plane 1: Used

0:Not

Used

0:Not

Used

0:Not

Used

initialization process of RAB establishment or SRNS relocation. This

parameter

indicates whether the RNC ULogicalRnc.a mrNbMode5Us eTag

AMR_NB 7.95k Use Tag

supports

AMR

7.95 kbps in Iu UP 0:

Not

version 1. It is used in Used the

user

N/A

plane 1: Used

initialization process of RAB establishment or SRNS relocation. This

parameter

indicates whether the RNC ULogicalRnc.a mrNbMode6Us eTag

AMR_NB 10.2k Use Tag

supports

AMR

10.2 kbps in Iu UP 0:

Not

version 1. It is used in Used the

user

N/A

plane 1: Used

initialization process of RAB establishment or SRNS relocation. ULogicalRnc.a

parameter 0: Not mrNbMode7Us indicates whether the Used N/A 12.2k Use Tag eTag RNC supports AMR 1: Used

ZTE Confidential Proprietary

AMR_NB

This

1:Used 1:Used

NB-AMR Rate Control

Parameter Name

GUI Name

Parameter Description

Value Range

Unit

Default Value

Recom mende d Value

12.2 kbps in Iu UP version 1. It is used in the

user

plane

initialization process of RAB establishment or SRNS relocation. This

parameter

indicates whether the GBR of AMR URncFunction. amrGbrResInd

Service Whether to be Reserved

GBR rate assigned by the

forcibly

reserved in Iu UP V1 0: False mode, when the GBR 1: True

N/A

rate assigned by the CN

Indicator

does

not

match the

AMR rate configured by RNC. 0: AMR Rate The parameter is used Changi to

indicates

whether ng

narrowband

or Allowed

wideband AMR service after AMR

Rate

URncInfo.Intra Control Switch RlocAmrRtCtrl after

rate is allowed to be Relocati changed

after

the on

relocation or not. "0" 1: AMR N/A indicates rate changing Rate

Relocation

after relocation is not Changi allowed.

while

"1" ng

indicates rate changing Not after

relocation

0: AMR 0: AMR Rate

Rate

Changi Changi ng

is ng

Allowed Allowed after

after

Relocat Relocat ion

ion

1: cut

is Allowed

allowed.

after Relocati on

Specifies the Amr cut

URncFunction. Inter-RAT interRatV1V2A V1+V2 mrCut

ZTE Confidential Proprietary

Amr

Cut Decision

decision version

when

IuUP

including

V1+V2 in the inter-RAT

1: cut 2:

not N/A

cut

NB-AMR Rate Control

Parameter Name

GUI Name

Parameter Description

Value Range

Unit

Default Value

Recom mende d Value

case Specifies the Amr cut URncFunction. Intra-RAT intraRatV1V2A V1+V2 mrCut

decision

when

Amr version

Cut Decision

IuUP 1: cut

including 2:

not N/A

V1+V2 in the intra-RAT cut

not 2:

cut

not

cut

case

4.2 4.2.1

ZWF21-04-005 AMR Rate Controlling Uplink Rate Adjustment Based on the UE Transmitted Power Table 4-2

Parameter Description

Parameter Name

GUI Name

AMR

Rate This

ULogicalRnc.a Adjustment mrRncAdjust

Switch

D.refUUeIntMe asProfile UUeIntMeasPr ofile.profileId

Value Range

Unit

Default Value

Recom mende d Value

parameter

indicates whether AMR 0: Off for rate

RNC UUtranCellFD

Parameter Description

adjustment

is 1: On

N/A

0:Off

1:On

N/A

supported in the RNC.

Used

Internal Measurement Profile Profile Id

This parameter is the 0..6553 DN (Distinguish Name) 5, step N/A of UUeIntMeasProfile. 1 ID

internal 0..9,

measurement Profile

step 1

This parameter is used UAmrEvtTPUe Int.ueIntMCfgN o

Internal

Measurement Configuration Index

for

indexing

configuration parameters

of of

the the 0..6553 UE 5, step long

transmitted power event 1 report

for

AMR

dyanamical rate control. UAmrEvtTPUe Measurement This

ZTE Confidential Proprietary

parameter 0:

N/A

0:Ackn 0:Ackn

NB-AMR Rate Control

Parameter Name

GUI Name

Int.measRptTr Report Mod

Parameter Description

Value Range

Unit

indicates the RLC mode Acknow

Transfer Mode of

the

Default Value

Recom mende d Value

owledg owledg ed

measurement report. If Mode

internal ledged

Mode

the value is AM RLC, RLC

RLC

N/A

[6a, 6b] [6a, 6b]

RNC can request UE for 1: retransmission

after Unackn

receiving the error SDU owledg label (not continuous). If ed the value is UM RLC, Mode the

retransmission

is RLC

not required. Usually, report the results of the important measurements in AM mode and those less important in UM mode (to reduce the traffic volume

the

measurement and

report

increase

the

system capacity). This indicates

the

filtering

factor that UE performs

UAmrEvtTPUe Filter Int.filterCoeff

parameter

Coefficient

the L3 filtering on the measurement results of the

internal

measurement. UAmrEvtTPUe Int.measEvtNu m

UAmrEvtTPUe Int.meaEvtId

Maximum

This

2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19)

parameter

Event Number indicates the maximum 1..7, of UE Internal event number of UE step 1 Measurement internal measurement. UE

Internal

Measurement Event Identity

This

parameter

indicates

the

internal

UE [6a, 6b,

measurement 6f, 6g]

event identity.

UAmrEvtTPUe Time to Trigger This

ZTE Confidential Proprietary

(0,

parameter (0, 10, ms

[1280, [1280,

NB-AMR Rate Control

Parameter Name

GUI Name

Int.trigTime

Parameter Description

Value Range

Unit

indicates the period of 20, 40,

Default Value 1280]

Recom mende d Value 1280]

time during which the 60, 80, event condition has to 100, be

satisfied

before 120,

sending a measurement 160, report.

200, 240, 320, 640, 1280, 2560, 5000)m s

UAmrEvtTPUe Int.txPowerThr es

UE Transmitted Power Threshold

This

parameter

indicates

the

transmitted threshold

UE power

event

6a/6b. This

(-50, 0)dB, step1

[-1, -2] [-1, -2]

parameter

indicates the maximum DPCH uplink transmit power allowed for a UE. When uplink inner loop power

control

performed, the transmit Maximum USrvDivPc.ma xUlDpchPwr

Allowed Uplink DPCH Transmission Power

power newly calculated by a UE may be larger than this parameter. In this case, the UE can only use this parameter for transmitting signals.

[33,33, [33,33,

(-50..33 )dBm, step 1dBm

dBm

33,33,3 33,33,3 3,33,33 3,33,33 ,33,33] ,33,33]

This parameter is a nine-element These

elements

array. are

used in different load conditions

and

priorities.

user The

corresponding

ZTE Confidential Proprietary

NB-AMR Rate Control

Parameter Name

GUI Name

Parameter Description relationships elements levels

and and

Value Range

Unit

Default Value

Recom mende d Value

the load user

priorities are as follows: Element 1: low load, gold medal user Element 2: low load, silver medal user Element 3: low load, bronze medal user Element

medium

load, gold medal user Element

medium

load, silver medal user Element

medium

load, bronze user Element 7: high load, gold medal user Element 8: high load, silver medal user Element 9: high load, bronze medal user

4.2.2

Downlink Rate Adjustment Based on the Dedicated Measurement of Node B Transmitted Power Table 4-3

Parameter Description Reco

Parameter Name

GUI Name Parameter Description Value Range Unit

Default mmen Value

ded Value

ULogicalR nc.amrRnc Adjust

AMR

Adjustment Switch RNC

UNbDedM Profile Id

ZTE Confidential Proprietary

Rate This parameter indicates whether

AMR

rate 0: Off

for adjustment is supported 1: On

N/A

0:Off

1:On

N/A

in the RNC. This parameter indicates 0..9

NB-AMR Rate Control

Reco Parameter Name

GUI Name Parameter Description Value Range Unit

Default mmen Value

ded Value

easProfile.

the Profile Id for the

profileId

NodeB

dedicated

measurement.

Each

profile corresponds one setting

NodeB

dedicated measurement parameters. 0:

Period

Report Parameters for TCP in Power Balance 1:

Period

Report

Parameters for

Event

TCP in AMR or

DASF-PS

UNbDedM Function

eas.nbDM Configuration CfgNote

Parameters

function,

7: Event Report

Handover

A Report Param

Control

Paramet eters

This parameter indicates 2: the

Event purpose Report

ers

for for

TCP

in TCP in

etc. of the dedicated Parameters for N/A measurement TCP in parameters indicated by DASF-PS

AMR

the configuration index. 3:

Paramet B

Event

8: Event 8: B Report Event

Report

ers

Parameters for

TCP

in Param

TCP

AMR

eters

for Report

DASF-PS

for

TCP in

Period

AMR

Report Parameters for RTT in LCS 5:

Event

Report Parameters for SIR

ZTE Confidential Proprietary

Error

NB-AMR Rate Control

Reco Parameter Name

GUI Name Parameter Description Value Range Unit

Default mmen Value

ded Value

Outer

Loop

Power Control 6:

Event

Report Parameters for SIR

Error

Outer

Loop

Power Control 7:

Event

Report Parameters for TCP in AMR 8:

Event

Report Parameters for TCP in AMR 9:

Event

Report Parameters for TCP

Handover Control 10:

Event

Report Parameters for TCP

Handover Control

UNbDedM Dedicated eas.dedM Measurement easType

Type

UNbDedM Measurement eas.meas Filter FilterCoeff Coefficient

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This parameter indicates the type of dedicated measurement

executed by Node B

filtering

measurement shall

2: Transmitted Code Power

N/A

5: Round Trip Time

This parameter indicates how

1: SIR Error

the

values performed

(

Transmit ted Code Power

2: Trans mitted Code Power

0, 1, 2, 3, 4,

5, 6, 7, 8, 9, N/A

11, 13, 15, 17,

NB-AMR Rate Control

Reco Parameter

GUI Name Parameter Description Value Range Unit

Name

Default mmen Value

ded Value

before

measurement 19)

event

evaluation

and

reporting. The averaging shall be performed according to the following formula. F(n) =(1-a)* F(n-1) + a*M(n) The

variables

the

formula are defined as follows: F(n)

filtered

the

updated

measurement

result F(n-1) is the old filtered measurement result Mn is the latest received measurement result from physical

layer

measurements a = (1/2)^ (k/2) , where k is

the

Measurement

Filter Coefficient. If k=1 thereâ&#x20AC;&#x2122;s no filtering) In order to initialise the averaging filter, F(0) is set to M(1) when the first measurement result from the

physical

layer

measurement

received. This parameter indicates 1: On Demand UNbDedM Report eas.rptTyp Characteristic e

the report characteristics 2: Periodic of measurement results, 3: Event A which demand,

can

on 4: Event B

periodic or by 5: Event C

N/A

2: Periodic

2: Period ic

triggering all kinds of: 6: Event D

ZTE Confidential Proprietary

NB-AMR Rate Control

Reco Parameter Name

Default mmen

GUI Name Parameter Description Value Range Unit

Value

ded Value

events.

7: Event E 8: Event F

This parameter indicates the power offset of the DPCH

maximum

power,

which

threshold

defines that

shall trigger event A, B for

transmitted

carrier

power measurement. In

DRBC,

this

threshold is related to the

service

rate

following: Rate Level PS Service Measurement Rate (R) Threshold of UNbDedM Threshold of Event A/B eas.evtAb Event A/B for Level TcpThrd

R<=

Transmitted DlRateLevel[0]

(-50..0)dB, step 0.1dB

[-0.4,-1.6 [-0.4,]

1.6]

100

Code Power EvtAbTcpThrd [0] Level

DlRateLevel[0]<R<= DlRateLevel[1] EvtAbTcpThrd [1] Level

R>DlRateLevel[1] EvtAbTcpThrd [2] Other

case,

threshold

and

the service

rate independent, and the

threshold

EvtAbTcpThrd [0].

UNbDedM eas.evtAb cdefTime

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Measurement For event A/B/E/F, this Change

parameter

Time/Measur measurement hysteresis ement

time

and

the

(10..60000)ms, ms step 10ms

NB-AMR Rate Control

Reco Parameter Name

Default mmen

GUI Name Parameter Description Value Range Unit

Value

ded Value

Hysteresis

measurement hysteresis

Time

time

provides

the

duration during which a reporting criterion has to be

fulfilled

for

the

Measurement Reporting procedure

C/D,

this

triggered. For

event

parameter

change

time. and the change time is the time the measurement entity shall rise on (in ms), in order to trigger a measurement report.

UNbDedM eas.rptPrd Unit

Choice Report Periodicity Scale

This parameter indicates the report period unit applied by Node B for measurement

result

1: ms 2: min

N/A

1000

reporting. RptPrdUnit =1: This parameter indicates (10..60000)ms,

UNbDedM eas.rptPrd

Report Period

the

frequency

measurement

of step 10ms report RptPrdUnit =2:

transmitted by Node B. (1..60)min step min This parameter indicates the

maximum

DPCH

downlink transmit power. USrvDivPc DPCH

When

downlink

inner

(-35..15)dB,

.maxDlDpc Maximum DL loop power control is step 0.1dB hPwr Power performed, new transmit

[3,3,3,3, [3,3,3, dB

0,0,3,0,0 3,0,0, ]

3,0,0]

power must be smaller than or equal to the configured

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DPCH

NB-AMR Rate Control

Reco Parameter Name

GUI Name Parameter Description Value Range Unit

Default mmen Value

ded Value

Maximum DL Power. If the

newly

calculated

transmit power is larger than

the

DPCH

configured

Maximum

Power, set it to be equal to the configured DPCH Maximum DL Power. This

parameter

nine-element These

array.

elements

are

used in different load conditions

and

priorities.

user The

corresponding relationships

the

elements and load levels and user priorities are as follows: Element 1: low load, gold medal user Element 2: low load, silver medal user Element 3: low load, bronze medal user Element 4: medium load, gold medal user Element 5: medium load, silver medal user Element 6: medium load, bronze user Element 7: high load, gold medal user Element 8: high load, silver medal user Element 9: high load, bronze medal user

ZTE Confidential Proprietary

NB-AMR Rate Control

Reco Parameter

GUI Name Parameter Description Value Range Unit

Name

Default mmen Value

ded Value

Event

Counter Threshold for PS

UDrbc.dtc

DCH or DL

pEaThd

AMR Based

on D-TCP

the reported times of threshold

DTCP

measurement event A. If the times of the event A

1..255

N/A

the 1..255

N/A

that only uses TCP is larger

Decreasing Rate

This parameter indicates

than

this

threshold, the speed of downlink PS or AMR will be reduced. This parameter indicates

B the

Event Counter

event

reports. of

the

Restriction

times

transmitted code power

Increasing

is less than the event B

Rate on DL threshold

EbThd

counter

threshold of consecutive

Threshold for DTCP

UDrbc.dtcp

DCH

dedicated

exceed

or threshold indicated by

Triggering DL this parameter, it will AMR

trigger the downlink AMR

Increasing

increasing rate or allow

Rate

Based PS services to increase

on D-TCP

rate on DL DCH based on traffic volume report.

4.2.3

Dynamic Adjustment Triggered by Load and Resource Congestion Table 4-4

Parameter Description

Parameter Name

URncInfo.conF orbAmrSwit

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GUI Name

Switch

Parameter Description

Value Range

of This parameter is the 0:

Forbidding

switch

AMR

Unit

not

forbidding forbidde N/A deceleration n

Default Value 0:

Recom mende d Value

not 0:

not

forbidd forbidd en

NB-AMR Rate Control

Parameter Name

GUI Name

Parameter Description

Deceleration Triggered

Value Range

Unit

Default Value

Recom mende d Value

triggered by congestion 1: by control.

When is

on,

the forbidde

Congestion

switch

AMR n

Control

speed is forbidden even resource is congested.

Switch

Forbidding URncInfo.load ForAmrSwit

switch

AMR

AMR Deceleration Triggered

forbidding 0:

not

deceleration forbidde

triggered by overload n by

Overload

control. switch

When is

on,

0: N/A

the 1:

not 0:

forbidd forbidd en

AMR forbidde

not

speed is forbidden even n

Control

4.3

This parameter is the

resource is overload.

ZWF21-06-002 TrFO Table 4-5

Parameter Description

Parameter Name

GUI Name

Parameter Description

Value Range

Unit

Default Value

Recom mende d Value

Specifies the Amr cut URncFunction. Inter-RAT interRatV1V2A V1+V2 mrCut

decision Amr version

Cut Decision

when

IuUP 1: cut

including 2:

not N/A

1: cut

V1+V2 in the inter-RAT cut case Specifies the Amr cut decision

URncFunction. Intra-RAT intraRatV1V2A V1+V2 mrCut

Amr version

Cut Decision

when

IuUP 1: cut

including 2:

V1+V2 in the intra-RAT cut

not N/A

2: cut

not 2:

not

cut

case

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NB-AMR Rate Control

Related Counters and Alarms

5.1

Related Counters Table 5-1

Counters

Counter ID

Name

C310030466

Number of CS AMR 12.2k in the best cell

C310030467

Number of CS AMR 10.2k in the best cell

C310030468

Number of CS AMR 7.95k in the best cell

C310030469

Number of CS AMR 7.4k in the best cell

C310030470

Number of CS AMR 6.7k in the best cell

C310030471

Number of CS AMR 5.9k in the best cell

C310030472

Number of CS AMR 5.15k in the best cell

C310030473

Number of CS AMR 4.75k in the best cell

C310030638

Number of CS AMR 12.2k in the non-best cell

C310030639

Number of CS AMR 10.2k in the non-best cell

C310030640

Number of CS AMR 7.95k in the non-best cell

C310030641

Number of CS AMR 7.4k in the non-best cell

C310030642

Number of CS AMR 6.7k in the non-best cell

C310030643

Number of CS AMR 5.9k in the non-best cell

C310030644

Number of CS AMR 5.15k in the non-best cell

C310030645

Number of CS AMR 4.75k in the non-best cell

C310063411

Number of CS AMR 12.2k in the DRNC cell

C310063412

Number of CS AMR 10.2k in the DRNC cell

C310063413

Number of CS AMR 7.95k in the DRNC cell

C310063414

Number of CS AMR 7.4k in the DRNC cell

C310063415

Number of CS AMR 6.7k in the DRNC cell

C310063416

Number of CS AMR 5.9k in the DRNC cell

C310063417

Number of CS AMR 5.15k in the DRNC cell

C310063418

Number of CS AMR 4.75k in the DRNC cell

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NB-AMR Rate Control

C310040001

Holding time for the best cell,AMR12.2

C310040002

Holding time for the best cell,AMR10.2

C310040003

Holding time for the best cell,AMR7.95

C310040004

Holding time for the best cell,AMR7.4

C310040005

Holding time for the best cell,AMR6.7

C310040006

Holding time for the best cell,AMR5.9

C310040007

Holding time for the best cell,AMR5.15

C310040008

Holding time for the best cell,AMR4.75

C310040075

Holding time for the non-best cell,AMR12.2

C310040076

Holding time for the non-best cell,AMR10.2

C310040077

Holding time for the non-best cell,AMR7.95

C310040078

Holding time for the non-best cell,AMR7.4

C310040079

Holding time for the non-best cell,AMR6.7

C310040080

Holding time for the non-best cell,AMR5.9

C310040081

Holding time for the non-best cell,AMR5.15

C310040082

Holding time for the non-best cell,AMR4.75

C310073296

Holding time for the DRNC cell,AMR12.2

C310073297

Holding time for the DRNC cell,AMR10.2

C310073298

Holding time for the DRNC cell,AMR7.95

C310073299

Holding time for the DRNC cell,AMR7.4

C310073300

Holding time for the DRNC cell,AMR6.7

C310073301

Holding time for the DRNC cell,AMR5.9

C310073302

Holding time for the DRNC cell,AMR5.15

C310073303

Holding time for the DRNC cell,AMR4.75

C310073296

Holding time for the DRNC cell,AMR12.2

C310073297

Holding time for the DRNC cell,AMR10.2

C310073298

Holding time for the DRNC cell,AMR7.95

C310073299

Holding time for the DRNC cell,AMR7.4

C310073300

Holding time for the DRNC cell,AMR6.7

C310073301

Holding time for the DRNC cell,AMR5.9

C310073302

Holding time for the DRNC cell,AMR5.15

C310073303

Holding time for the DRNC cell,AMR4.75

ZTE Confidential Proprietary

NB-AMR Rate Control

C310291927

C310291928

C310291929

C310291930

C310291931

C310291932

C310291933

C310291934

C310373796

C310373797

C310373798

C310373799

C310373800

C310373801

C310373802

C310373803

Number of abnormal release RAB by Uu-fail,CS,AMR 12.2 Number of abnormal release RAB by Uu-fail,CS,AMR 10.2 Number of abnormal release RAB by Uu-fail,CS,AMR 7.95 Number of abnormal release RAB by Uu-fail,CS,AMR 7.4 Number of abnormal release RAB by Uu-fail,CS,AMR 6.7 Number of abnormal release RAB by Uu-fail,CS,AMR 5.9 Number of abnormal release RAB by Uu-fail,CS,AMR 5.15 Number of abnormal release RAB by Uu-fail,CS,AMR 4.75 Number ofRAB by RAB releasefor CS,conversation:AMR 12.2 Number ofRAB by RAB releasefor CS,conversation:AMR 10.2 Number ofRAB by RAB releasefor CS,conversation:AMR 7.95 Number ofRAB by RAB releasefor CS,conversation:AMR 7.4 Number ofRAB by RAB releasefor CS,conversation:AMR 6.7 Number ofRAB by RAB releasefor CS,conversation:AMR 5.9 Number ofRAB by RAB releasefor CS,conversation:AMR 5.15 Number ofRAB by RAB releasefor CS,conversation:AMR 4.75

C310800164

Max Number of DC+MIMO users in NodeB

C310800165

Current Number of DC+MIMO users in NodeB

C310231185

Total number of RABrelease for CS domain,AMR 12.2

C310231186

Total number of RABrelease for CS domain,AMR 10.2

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NB-AMR Rate Control

C310231187

Total number ofRABreleasefor CS domain,AMR 7.95

C310231188

Total number of RABrelease for CS domain,AMR 7.4

C310231189

Total number of RABrelease for CS domain,AMR 6.7

C310231190

Total number of RABrelease for CS domain,AMR 5.9

C310231191

Total number ofRABreleasefor CS domain,AMR 5.15

C310231192

Total number ofRABreleasefor CS domain,AMR 4.75

C310231231

C310231232

C310231233

C310231234

C310231235

C310231236

C310231237

C310231238

C310231162

C310231163

C310231164

C310231165

C310231166

C310231167 C310231168

ZTE Confidential Proprietary

Number of RNC initiate RAB release by Iu release request for CS domain,AMR 12.2 Number of RNC initiate RAB release by Iu release request for CS domain,AMR 10.2 Number of RNC initiate RAB release by Iu release request for CS domain,AMR 7.95 Number of RNC initiate RAB release by Iu release request for CS domain,AMR 7.4 Number of RNC initiate RAB release by Iu release request for CS domain,AMR 6.7 Number of RNC initiate RAB release by Iu release request for CS domain,AMR 5.9 Number of RNC initiate RAB release by Iu release request for CS domain,AMR 5.15 Number of RNC initiate RAB release by Iu release request for CS domain,AMR 4.75 Number of RAB abnormal release for CS domain,AMR 12.2 Number of RAB abnormal release for CS domain,AMR 10.2 Number of RAB abnormal release for CS domain,AMR 7.95 Number of RAB abnormal release for CS domain,AMR 7.4 Number of RAB abnormal release for CS domain,AMR 6.7 Number of RAB abnormal release for CS domain,AMR 5.9 Number of RAB abnormal release for CS domain,AMR

NB-AMR Rate Control

5.15

C310231169

5.2

Number of RAB abnormal release for CS domain,AMR 4.75

Related Alarms This feature has no related alarms.

Engineering Guide

6.1

Application Scenario

6.1.1

ZWF21-02-001 Conversational RAB for AMR With this feature, users can make calls on the ZTE UMTS network. This feature is a basic feature of UMTS networks.

6.1.2

ZWF21-04-005 AMR Rate Controlling With this feature, ZTE's RNC can adjust the uplink and downlink NB-AMR rates based on the UE uplink transmit power and NodeB downlink transmit power respectively, or adjust AMR rates during resource congestion. This feature improves cell capacity and user experience when radio link quality is reduced.

6.1.3

ZWF21-06-002 TrFO With this feature, Out of Band Transcoder Control (OoBTC) can be used during NB-AMR service establishment to implement consistent voice encoding and decoding negotiation between the UE and the network. In this way, the TC (Transcoder) is not necessary and coded voice data is transmitted transparently between users. This improves voice quality and saves transmission bandwidth between core networks.

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NB-AMR Rate Control

6.2

Feature Activation Procedure

6.2.1

ZWF21-02-001 Conversational RAB for AMR None.

6.2.2

ZWF21-04-005 AMR Rate Controlling

6.2.2.1

Uplink Rate Adjustment Based on the UE Transmit Power In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > PLMN Relating Configuration > Logic RNC Configuration and set AMR Rate Adjustment Switch for RNC, see the following figure.

Figure 6-1

Parameter Configuration Interface 1

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > UTRAN Cell and set Used UE Internal Measurement Profile to default, see the following figure.

ZTE Confidential Proprietary

NB-AMR Rate Control

Figure 6-2

Parameter Configuration Interface 2

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical

Function

Configuration

Service

Configuration

Measurement

Configuration > UE Internal Measurement Profile and set Profile ID to default, see the following figure.

Figure 6-3

Parameter Configuration Interface 3

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical

Function

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Configuration

Service

Configuration

Measurement

NB-AMR Rate Control

Configuration > UE Internal Measurement Profile > UE Transmitted Power Event Measurement Configuration for AMR and set Measurement Report Transfer Mode, Filter Coefficient, Maximum Event Number of UE Internal Measurement, UE Internal Measurement Event Identity, Time to Trigger, and UE Transmitted Power Threshold, see the following figure.

Figure 6-4

Parameter Configuration Interface 4

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > Service Configuration > Service Function > Power Control Profile Related to Service > Power Control Related to Service > Power Control Related to Service and Diversity Mode and set Maximum Allowed Uplink DPCH Transmission Power, see the following figure.

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NB-AMR Rate Control

Figure 6-5

6.2.2.2

Parameter Configuration Interface 5

Downlink Rate Adjustment Based on the Dedicated Measurement of NodeB Transmit Power In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > PLMN Relating Configuration > Logic RNC Configuration and set AMR Rate Adjustment Switch for RNC, see the following figure.

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NB-AMR Rate Control

Figure 6-6

Parameter Configuration Interface 6

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical

Function

Configuration

Service

Configuration

Measurement

Configuration > NodeB Dedicated Measurement Profile and set Profile Id to default, see the following figure.

Figure 6-7

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Parameter Configuration Interface 7

NB-AMR Rate Control

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical

Function

Configuration

Service

Configuration

Measurement

Configuration > NodeB Dedicated Measurement Configuration and set Function of Configuration Parameters, Dedicated Measurement Type, Measurement Filter Coefficient, Report Characteristics, Measurement Threshold of Event A/B for Transmitted Code Power, Measurement Change Time/Measurement Hysteresis Time, Choice Report Periodicity Scale, and Report Period, see the following figure.

Figure 6-8

Parameter Configuration Interface 8

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical

Function

Configuration

Service

Configuration

Measurement

Configuration > NodeB Dedicated Measurement Configuration and set DPCH Maximum DL Power to default, see the following figure.

ZTE Confidential Proprietary

NB-AMR Rate Control

Figure 6-9

Parameter Configuration Interface 9

In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > Global Information Configuration > Dynamic Radio Bearer Control Information Profile > Dynamic Radio Bearer Control Information and set Event A Counter Threshold for PS on DL DCH or DL AMR Decreasing Rate Based on D-TCP and Event B Counter Threshold for Restriction PS Increasing Rate on DL DCH or Triggering DL AMR Increasing Rate Based on D-TCP to default, see the following figure.

Figure 6-10

ZTE Confidential Proprietary

Parameter Configuration Interface 10

NB-AMR Rate Control

6.2.2.3

Dynamic Adjustment Triggered by Load and Resource Congestion In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration > Global Information Configuration > Dynamic Radio Bearer Control Information Profile > Dynamic Radio Bearer Control Information and set Switch of Forbidding AMR Deceleration Triggered by Congestion Control and Switch of Forbidding AMR Deceleration Triggered by Overload Control to default, see the following figure.

Figure 6-11

6.2.3

Parameter Configuration Interface 11

ZWF21-06-002 TrFO In the configuration resource tree, select Modify Area > Managed Element > UMTS Logical Function Configuration and set S Intra-RAT V1+V2 Amr Cut Decision and Inter-RAT V1+V2 Amr Cut Decision, see the following figure.

ZTE Confidential Proprietary

NB-AMR Rate Control

Figure 6-12

Parameter Configuration Interface 12

6.3

Feature Validation Procedure

6.3.1

ZWF21-02-001 Conversational RAB for AMR N/A

6.3.2

ZWF21-04-005 AMR Rate Controlling Table 6-1

Feature Validation Procedure

Test Item

Prerequisit

AMR Rate Controlling based on UE TxPower 1.

The WCDMA system is ready.

Cell1 supports HSUPA, HSDPA, and DCH.

Both the CN and the RNC support multiple rates for AMR. Uplink

and downlink AMR voice supports the rates of 12.2 kbps, 7.4 kbps, 5.15 kbps, and 4.75 kbps.

Steps

UE1 and UE2 camp on Cell1 in idle mode.

UE1 makes an AMR voice call to UE2 in Cell1.

UE1 is deleted from Cell1 to trigger event 6A. The uplink AMR rate of UE1 is decreased.

UE1 is added to Cell1 to trigger event 6B. The uplink AMR rate of UE1 is increased.

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The voice call is released.

NB-AMR Rate Control

Test Item 1.

Expected

The initial and highest bit rate of the AMR voice service is 12.2 kbps.

Result

6.3.3

AMR Rate Controlling based on UE TxPower

The AMR rate adaptation procedure is normal.

ZWF21-06-002 TrFO N/A

6.4

Feature Deactivation Procedure

6.4.1

ZWF21-02-001 Conversational RAB for AMR N/A

6.4.2

ZWF21-04-005 AMR Rate Controlling Table 6-2 No 1

6.4.3

RNC Parameter Parameter Name

AMR Rate Adjustment Switch for RNC

Default Value 0:Off

Deactivation Value 0:Off

ZWF21-06-002 TrFO The CN deactivates the feature.

6.5

Impact on the Network

6.5.1

ZWF21-02-001 Conversational RAB for AMR 1) Impact on Equipment Performance None.

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NB-AMR Rate Control

2) Impact on Network KPIs Advantages of this feature: Users can make NB-AMR conversational calls in the UMTS network. Disadvantages of this feature: None.

6.5.2

ZWF21-04-005 AMR Rate Controlling 1) Impact on Equipment Performance None. 2) Impact on Network KPIs Advantages of this feature: With this feature, ZTE's RNC can adjust the uplink and downlink NB-AMR rates based on the UE uplink transmit power and NodeB downlink transmit power respectively, or adjust AMR rates during resource congestion. This feature improves cell capacity and user experience when radio link quality is reduced. Disadvantages of this feature: Voice quality is slightly reduced when the NB-AMR rate is reduced.

6.5.3

ZWF21-06-002 TrFO 1) Impact on Equipment Performance None. 2) Impact on Network KPIs Advantages of this feature:

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NB-AMR Rate Control

With this feature, Out of Band Transcoder Control (OoBTC) can be used during NB-AMR service establishment to implement consistent voice encoding and decoding negotiation between the UE and the network. In this way, the TC (Transcoder) is not necessary and coded voice data is transmitted transparently between users. This improves voice quality and saves transmission bandwidth between core networks. Disadvantages of this feature: None.

Abbreviations Abbreviation

Full Name

3GPP

3rd Generation Partnership Project

User Equipment

NB-AMR

Narrow Band Adaptive Multi-Rate

WB-AMR

Wide Band Adaptive Multi-Rate

TrFO

Transcoder Free Operation

OoBTC

Out-of-Band Transcoder Control

Transcoder

Reference Documents [1]ZXUR

9000

UMTS(V4.13.10.15)Radio

Network

Controller

Radio

Parameter

Reference [2]ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Ground Parameter Reference [3]ZXUR 9000 UMTS(V4.13.10.15)Radio Network Controller Performance Counter Reference [4]ZXWR RNC(V3.13.10.15)Radio Network Controller Radio Parameter Reference [5]ZXWR RNC(V3.13.10.15)Radio Network Controller Ground Parameter Reference

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NB-AMR Rate Control

[6]ZXWR RNC(V3.13.10.15)Radio Network Controller Performance Counter Reference [7]ZTE UMTS Directed Retry to GSM Feature Guide [8]ZTE UMTS Power Control Feature Guide [9]ZTE UTMS Overload Control Feature Guide [10]ZTE UMTS Congestion Control Feature Guide [11]ZTE UMTS Adaptive Radio Bearer Feature Guide

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