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, TS 23.237 and TS 23.216;
• 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.

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