LTE HO Strategy Features KPIs
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LTE HO Strategy
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LTE Idle Mode Camping
Two main parameters for camping:
qRxLevMin (RSRP) = -140dBm qQualMin (RSRQ) = -33dB
RSRP = -140dBm RSRQ = -33dB
Idle Mode Support
LTE f1/f2/f3 BTS
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f1/f2/f3 BTS
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Cell Selection/Reselection and PLMN Selection
Yossi Verona
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Intra LTE HO – Interfaces Involved In Intra-LTE HO
Intra-LTE Handover
Three types of Intra-LTE HO:
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Intra-RBS X2 Inter-RBS S1 Inter-RBS
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Intra LTE HO – Interfaces Involved In Intra-LTE HO
No need to define Intra frequency neighbors:
By default, UE in the LTE network detects suitable neighbor cells, without the assistance of a list of neighbor cells sent by the serving RBS.
= Both = RSRP
=3dB
=0
=1dB
=480ms =40ms
=0 Yossi Verona
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Intra LTE HO Related Features
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Inter RAT LTE Mobility To WCDMA Concept
In order to allow LTE to WCDMA mobility the following feature should be activated in the eNB:
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Coverage-Triggered WCDMA Session Continuity
Coverage-Triggere d WCDMA Session Continu
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Inter RAT LTE Cell Reselection To WCDMA – Idle Mode
By activating the feature “Coverage-Triggered WCDMA Session Continuity” the creation and transmission of SIB6 in the eNB is enabled. SIB6 contains information and parameters required by the UE to perform idle mode reselection to the WCDMA network. No need to define specific WCDMA cells Neighbor List. The following information is provided in SIB6:
arfcnValueUtranDl cellReselectionPriority threshXHigh threshXLow tReselectionUtra tReselectionUtraSfMedium tReselectionUtraSfHigh
SIB6 LTE f1/f2/f3 BTS
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f1/f2/f3 BTS
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Inter RAT LTE Session Continuity To WCDMA – Conn. Mode
Poor coverage evaluation process using primary threshold:
= Both = RSRP
=1dB =-120dBm =-20dB
=480ms =640ms
=0 Yossi Verona
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Inter RAT LTE Session Continuity To WCDMA – Conn. Mode
Poor coverage evaluation process using primary threshold:
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Inter RAT LTE Session Continuity To WCDMA – Conn. Mode
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Poor coverage UE handling
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WCDMA To LTE Cell Reselection – Idle Mode
In order to allow WCDMA to LTE cell reselection (idle mode) the following feature should be activated in the RNC:
LTE Cell Reselection (FAJ 121 1474) - ‘eutran detection’, EutranFreqRelation MO parameters.
By activating the feature creation and transmission of SIB19 in the WCDMA nodeB is enabled. SIB19 contains information and parameters required by the UE to perform idle mode reselection to the LTE network. No need to define specific LTE cells Neighbor List and no need to reconsider WCDMA already existing neighbors. Cell reselection to LTE is supported by E-UTRA capable UEs in Idle Mode and in URA_PCH. The following information is provided in SIB19:
LTE DL EARFCN (Max 8) cellReselectionPriority More…
LTE f1/f2/f3
f1/f2/f3 WCDMA - Idle Mode
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BTS
BTS
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SIBs Scheduling Change to Contain SIB19
Recommended to be changed
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WCDMA To LTE Release With Re-Direct – Connected Mode
In order to allow WCDMA to LTE release with redirection in connected mode, the following feature should be activated in the RNC:
Release with Redirect to LTE (FAJ 121 2174) – ’releaseRedirect’ Parameter.
Release with Redirect to LTE (FAJ 121 2174) is a complement to LTE Cell Reselection. It ensures mobility to LTE for an active UE that spends little time in Idle Mode or in state URA_PCH where LTE Cell Reselection can be performed. It is a blind redirection, fast and without compressed mode. There is no pre-allocation of resources in the target LTE system. Release with Redirect to LTE is not supported when the best cell is located in DRNC.
LTE f1/f2/f3 Yossi Verona
BTS
If UE State: • Idle • Ura (FD) • Then - > ‘RRC Connection Release with redirection information (e-Utra Freq)
f1/f2/f3 BTS
Release with Redirect to LTE
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Features LTE Features
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KPIs
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LTE Initial Selected KPIs
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LTE DL Resource Grid With 5M BW
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