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TR 23.756SA2
Study for
Single Radio Voice Continuity
from 5G to 3G

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for a better overview, the Table of Contents (ToC) is reproduced
V16.0.0 (Wzip)  2018/09  27 p.

Rapporteur:  Mr. Ren, Chi

The scope of the present document is to investigate solutions from architecture point of view to support single radio voice call continuity (SRVCC) from NG-RAN to UTRAN. Issues to be resolved will be collected and documented in the TR with a possible resolution.

full Table of Contents for  TR 23.756  Word version:   16.0.0

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1  ScopeWord-p. 6
2  ReferencesWord-p. 6
3  Definitions and abbreviationsWord-p. 6
4  Architectural assumptions and requirementsWord-p. 6
5  Key IssuesWord-p. 7
5.1  Key Issue #1: Enabling SRVCC from NG-RAN to UTRANWord-p. 7
5.2  Key Issue #2: SRVCC HO Procedure from NG-RAN to UTRANWord-p. 7
5.3  Key Issue #3: Return from UTRAN to E-UTRA or NRWord-p. 7
5.4  Key Issue #4: Analysis of impacts for not supporting PS HO support in conjunction with SRVCC from NG-RAN to UTRANWord-p. 8
6  SolutionsWord-p. 8
6.1  Solution #1: Enable 5G SRVCC with existing mechanismWord-p. 8
6.2  Solution #2: Indirect SRVCC procedureWord-p. 9
6.3  Solution #3: Returning UE from UTRAN to NR or E-UTRA using MME-liteWord-p. 13
6.4  Solution #4: Return to 5GS when the UE is switched into EPS after voice ends in 3GWord-p. 15
6.5  Solution #5: PDU session release after 5G SRVCC procedureWord-p. 17
6.6  Solution #6: PDU session suspend after 5G SRVCC procedureWord-p. 19
6.7  Solution #7: Returning UE from UTRAN to E-UTRA using MME-liteWord-p. 21
6.8  Solution #8: Solution for key issue 3# - 2 Step method Return 5GS After 5G SRVCC with existing mechanismWord-p. 23
6.9  Solution #9: Solution for key issue 3# - Return 5GS After 5G SRVCC depend on UE implementationWord-p. 23
7  EvaluationWord-p. 24
7.1  Evaluation on solution for key issue #1Word-p. 24
7.2  Evaluation on solution for key issue #2Word-p. 24
7.3  Evaluation about solutions for Key Issue #4Word-p. 24
7.4  Evaluation on solutions for key issue #3Word-p. 25
8  ConclusionsWord-p. 26
A  Change historyWord-p. 27

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