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TR 23.831 (SA2)
Service Continuity –
Inter-UE Transfer enhancements

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V10.0.0 (Wzip)    2010/09    81 p.

Rapporteur:  Mr. Zhang, Heng liang
See also:  ISC-related TS/TR    

This TR intends to develop enhancements to Rel-9 IMS Service Continuity in TS 23.237, specifically in the functional area of Inter-UE Transfer. The main objective is to provide enhancements to mobility of media flows of a session between different UEs (Inter-UE Transfer) with respect to the following aspects:
  • Extension of Inter-UE Transfer and Collaborative Session capabilities specified in Rel-09 to multiple UEs belonging to different IMS subscriptions under the same operator.
  • Establishment of a Collaborative Session at session setup.
  • Support for control of media components of a Collaborative Session by more than one UE simultaneously.
  • Transfer of control of a Collaborative Session.
  • Controller initiated media modification on a Controllee UE (e.g. video resolution).
  • Discovery of ongoing IMS multimedia sessions on different UEs.
  • Inter-UE Transfer initiated by the target UE when:
    • the target UE belongs to the Collaborative Session but it is not a Controller UE;
    • the target UE does not belong to the Collaborative Session and wants to join;
    • Inter-UE Transfer is performed without establishing a Collaborative Session.
  • Replication of an ongoing multimedia session from one UE on another UE.
  • Inter-UE Transfer between UEs connected to the IMS via an IP-CAN and ICS entities that provide interworking with UEs in the CS Domain.
  • Execution of MMTEL services for Collaborative Sessions.
This document contains the results of an assessment of alternative architectures to support Inter-UE Transfer enhancements.


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1   Scope   Word-p. 7
2   References
3   Definitions and abbreviations   Word-p. 8
4   Scenarios and Operations
5   Architectural Requirements and Assumptions   Word-p. 18
6   Architecture Alternatives   Word-p. 20
6.1   Alternative 1      Up
6.1.1   Architecture Reference Model
6.1.2   Control and User Plane Paths   Word-p. 21
6.1.3   Information Flows   General   Establishment of Collaborative Session upon Originating IMS Session Setup   Word-p. 22   Establishment of Collaborative Session upon Terminating IMS Session Setup   Word-p. 27      Up   Transfer of Collaborative Session Control   Word-p. 32   Media flow transfer initiated by the target UE   Word-p. 39   Media flow transfer initiated by UE other than the target UE   Word-p. 46      Up   Session Replication by remote party   Word-p. 54   Media Flow Replication by network   Word-p. 58   Inter-UE Transfer between IMS UEs and CS UEs   Word-p. 63   Session Discovery   Word-p. 65   Collaborative Session handling upon loss of Collaborative Session Control   Media modification among UEs under different subscriptions   Word-p. 68   IUT without establishing a Collaborative Session between UEs belonging to different IMS subscription within same operator   Word-p. 70
6.1.4   Collaboration Profile   Word-p. 73
6.1.5   Execution of supplementary services   Word-p. 74      Up
7   Conclusions
A   Change history   Word-p. 79

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