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TR 23.856 (SA2)
Single Radio Voice Call Continuity (SRVCC) enhancements

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V10.0.0 (Wzip)  2010/09  80 p.


Rapporteur:  Mr. Hou, Zhiqiang
See also:  SRVCC-related TS/TR

SR-VCC has been standardized in Release 8 TS 23.216 to provide seamless continuity when UE handovers from EUTRAN to UTRAN/GERAN.

This TR contains the results of feasibility study of the requirements and the alternative solutions to improve the handover performance of SRVCC.

The objective of this study is as follows:
  • Evaluating the performance of current Rel-8 SRVCC solution;
  • Enhancing the performance of the SR-VCC Flow Break with regard to the roaming and non-roaming case;
  • Enhancing SR-VCC handover performance while minimizing the impacts on the network architecture for the directions
    • from E-UTRAN to UTRAN/GERAN; and
    • from UTRAN to UTRAN/GERAN.


 

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1 Scope2 References3 Definitions and abbreviations3.1 Definitions3.2 Abbreviations4 Requirements4.1 General4.2 Architectural Requirements4.3 SRVCC Performance Requirements5 Performance Analysis of Rel-8 SRVCC solution5.1 Analysis of SRVCC handover performance from EUTRAN to UTRAN/GERAN5.2 Analysis of SRVCC handover performance from HSPA to UTRAN/GERAN5.3 Analysis of call drop probability in SRVCC6 Alternatives6.1 Alternative 1 - enhancement using delay prediction6.2 Alternative 2 - Serial Handover6.4 Alternative 4 - Media anchor in the serving network6.5 Alternative 5 - Remote update optimization6.8 Alternative 8 - SR-VCC Enhancement using anchoring in the home network6.9 Alternative 9 - SR-VCC Enhancement using media detection6.10 Alternatives 10 - eSRVCC with PDN bi-casting6.11 Alternative 11 - Media anchoring in the IMS-ALG6.12 Alternative 12 - HO enhancement by local anchoring with Indirect Forwarding (Merged alternative of alternatives 6 and 7)6.13 Consolidated Alternative - SIP based solution for eSRVCC7 Assessment7.1 Assessment Criteria7.2 Assessment of alternatives8 ConclusionA Reducing the call drop probabilityA.1 Pre-handover optimizationB Impacts on nodes of eSRVCC alternativesC Examples of ATCF/ATGW collocation - SIP based solution for eSRVCCC.1 GeneralC.2 IMS ALG/IMS AGWC.3 IBCF/TrGWD Change history

 

1  ScopeWord-p. 7
2  References
3  Definitions and abbreviationsWord-p. 8
4  Requirements
5  Performance Analysis of Rel-8 SRVCC solutionWord-p. 9
6  AlternativesWord-p. 11
6.1  Alternative 1 - enhancement using delay prediction
6.2  Alternative 2 - Serial HandoverWord-p. 16
6.3Void
6.4  Alternative 4 - Media anchor in the serving networkWord-p. 17
6.5  Alternative 5 - Remote update optimizationWord-p. 22
6.6Void
6.7Void
6.8  Alternative 8 - SR-VCC Enhancement using anchoring in the home networkWord-p. 23
6.9  Alternative 9 - SR-VCC Enhancement using media detectionWord-p. 34Up
6.10  Alternatives 10 - eSRVCC with PDN bi-castingWord-p. 37
6.11  Alternative 11 - Media anchoring in the IMS-ALGWord-p. 41
6.12  Alternative 12 - HO enhancement by local anchoring with Indirect Forwarding (Merged alternative of alternatives 6 and 7)
6.13  Consolidated Alternative - SIP based solution for eSRVCCWord-p. 53
7  AssessmentUp
8  ConclusionWord-p. 69
A  Reducing the call drop probabilityWord-p. 70
B  Impacts on nodes of eSRVCC alternativesWord-p. 73
C  Examples of ATCF/ATGW collocation - SIP based solution for eSRVCCWord-p. 77
D  Change historyWord-p. 80

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