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TR 23.885SA2
Feasibility Study of
Single Radio Voice Call Continuity (SRVCC)

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V11.0.0 (Wzip)  2011/09  83 p.

Rapporteur:  Mr. Barankanira, Delphin

The objective of the feasibility study is to investigate a solution for supporting Single Radio Voice Call Continuity (SRVCC) from 3GPP UTRAN/GERAN CS access to 3GPP E-UTRAN/HSPA access, for voice call initiated in LTE/HSPA access and previously handed over to UTRAN/GERAN CS access, as well as for the voice call directly initiated in UTRAN/GERAN CS access.

full Table of Contents for  TR 23.885  Word version:   11.0.0

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1  ScopeWord-p. 7
2  References
3  Definitions and abbreviationsWord-p. 8
4  Requirements and Assumptions
5  Architecture model and reference pointsUp
6  Solutions
6.1  Solution 1: Session transfer initiated on E-UTRAN/HSPA
6.2  Solution 2: Session transfer initiated on E-UTRAN/HSPAWord-p. 20
6.3  Solution 3+5: Media anchoring in serving network with Access Transfer Control FunctionalityWord-p. 25
6.3.1  Architecture Reference Model
6.3.2  Functional EntitiesWord-p. 26
6.3.3  Message Flows  General principles  GERAN/UTRAN Attach procedureWord-p. 29  E-UTRAN attach procedure  Informing the source RAN about the possibility to perform rSRVCCUp  Codec and transport address related procedureWord-p. 30  Establish a session over CS  CS - PS Access Transfer OverviewWord-p. 33  Access Transfer Preparation  IMS Session Continuity procedureWord-p. 45  Identification of serving PS nodeWord-p. 48
6.3.4  IMS registration ConsiderationsWord-p. 50
6.4  Solution 4: Session transfer by local anchoring with Indirect ForwardingWord-p. 53
6.5  Solution 5: IMS procedure is initiated by MSC Server to ATCFWord-p. 59
7  Assessment of the solutionsWord-p. 73
8  ConclusionWord-p. 77
A  Mechanisms to re-enable E-UTRAN capabilityWord-p. 78
B  Mechanisms for GERAN/UTRAN sending Handover/Relocation Required messageWord-p. 82
C  Change historyWord-p. 83

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