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

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(W-zip) V10.0.0    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 Scope    2 References    3 Definitions and abbreviations    3.1 Definitions    3.2 Abbreviations    4 Requirements    4.1 General    4.2 Architectural Requirements    4.3 SRVCC Performance Requirements    5 Performance Analysis of Rel-8 SRVCC solution    5.1 Analysis of SRVCC handover performance from EUTRAN to UTRAN/GERAN    5.2 Analysis of SRVCC handover performance from HSPA to UTRAN/GERAN    5.3 Analysis of call drop probability in SRVCC    6 Alternatives    6.1 Alternative 1 - enhancement using delay prediction    6.2 Alternative 2 - Serial Handover    6.3 Void    6.4 Alternative 4 - Media anchor in the serving network    6.5 Alternative 5 - Remote update optimization    6.6 Void    6.7 Void    6.8 Alternative 8 - SR-VCC Enhancement using anchoring in the home network    6.9 Alternative 9 - SR-VCC Enhancement using media detection    6.10 Alternatives 10 - eSRVCC with PDN bi-casting    6.11 Alternative 11 - Media anchoring in the IMS-ALG    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 eSRVCC    7 Assessment    7.1 Assessment Criteria    7.2 Assessment of alternatives    8 Conclusion    A Reducing the call drop probability    A.1 Pre-handover optimization    B Impacts on nodes of eSRVCC alternatives    C Examples of ATCF/ATGW collocation - SIP based solution for eSRVCC    C.1 General    C.2 IMS ALG/IMS AGW    C.3 IBCF/TrGW    D Change history   

 

1   Scope   Word-p. 7
2   References
3   Definitions and abbreviations   Word-p. 8
4   Requirements
5   Performance Analysis of Rel-8 SRVCC solution   Word-p. 9
6   Alternatives   Word-p. 11
6.1   Alternative 1 - enhancement using delay prediction
6.2   Alternative 2 - Serial Handover   Word-p. 16
6.3   Void
6.4   Alternative 4 - Media anchor in the serving network   Word-p. 17
6.5   Alternative 5 - Remote update optimization   Word-p. 22
6.6   Void
6.7   Void
6.8   Alternative 8 - SR-VCC Enhancement using anchoring in the home network   Word-p. 23
6.9   Alternative 9 - SR-VCC Enhancement using media detection   Word-p. 34      Up
6.10   Alternatives 10 - eSRVCC with PDN bi-casting   Word-p. 37
6.11   Alternative 11 - Media anchoring in the IMS-ALG   Word-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 eSRVCC   Word-p. 53
7   Assessment      Up
8   Conclusion   Word-p. 69
A   Reducing the call drop probability   Word-p. 70
B   Impacts on nodes of eSRVCC alternatives   Word-p. 73
C   Examples of ATCF/ATGW collocation - SIP based solution for eSRVCC   Word-p. 77
D   Change history   Word-p. 80

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