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

ToC   3GPP‑Page   Help    
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  ScopeWord-p. 7
2  References
3  Definitions and abbreviationsWord-p. 8
4  Scenarios and Operations
5  Architectural Requirements and AssumptionsWord-p. 18
6  Architecture AlternativesWord-p. 20
6.1  Alternative 1Up
6.1.1  Architecture Reference Model
6.1.2  Control and User Plane PathsWord-p. 21
6.1.3  Information Flows  General  Establishment of Collaborative Session upon Originating IMS Session SetupWord-p. 22  Establishment of Collaborative Session upon Terminating IMS Session SetupWord-p. 27Up  Transfer of Collaborative Session ControlWord-p. 32  Media flow transfer initiated by the target UEWord-p. 39  Media flow transfer initiated by UE other than the target UEWord-p. 46Up  Session Replication by remote partyWord-p. 54  Media Flow Replication by networkWord-p. 58  Inter-UE Transfer between IMS UEs and CS UEsWord-p. 63  Session DiscoveryWord-p. 65  Collaborative Session handling upon loss of Collaborative Session Control  Media modification among UEs under different subscriptionsWord-p. 68  IUT without establishing a Collaborative Session between UEs belonging to different IMS subscription within same operatorWord-p. 70
6.1.4  Collaboration ProfileWord-p. 73
6.1.5  Execution of supplementary servicesWord-p. 74Up
7  Conclusions
A  Change historyWord-p. 79

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