IP Multimedia Subsystem (IMS) service continuity enhancements; Service, policy and interaction; Stage 2
This technical report intends to develop enhancements for Rel-8 IMS Service Continuity and solutions for mobility of media flows and control of a session between different devices under the same subscription (i.e. Inter-UE Transfer) to a state where they can be transferred to normative specifications, focusing on the following aspects:
For Inter-UE transfer:
- Inter-UE Transfer scenarios for transferring/retrieval/addition/deletion of media flows in a Collaborative Session;
- Inter-UE Transfer scenarios for establishment or continuation of a Collaborative Session while transferring control;
- Transferring media flows to the target UE whilst keeping the Collaborative Session control in the source UE.
For IMS Service Continuity Enhancement:
- Management of operator policy and user preferences;
- Interaction and coexistence with underlying mobility mechanisms and corresponding policies;
- Further capabilities for the support of mid-call services during session transfer, in addition to those defined in TS 23.292 [6], TS 23.237 [5] and TS 23.216 [6];
- Session Continuity for speech and video over CS.
IMS Service Continuity will be restricted to service continuity using IMS procedures, i.e. mobility mechanisms on the IP-CAN level are not within the scope of this document This document does not overlap with the underlying EPC and SRVCC features, even though there could be cross-references between the corresponding Technical Specifications.