Patent ID: 8547935
Filing Date: 2013-10-01
Classification: H04L,H04W

Abstract:
1. A method of handover in an Internet Protocol Multimedia System (IMS) network utilizing a Mobile Switching Centre (MSC) Server enhanced for Single Radio Voice Call Continuity (SR-VCC) for a call from a source Radio Access Network (RAN) to a target RAN, the method comprising the steps of: sending an indication from the MSC Server that a session transfer for the call should be prepared but not yet activated towards the target RAN; receiving at the MSC Server, from a Mobility Management Entity (MME) of the source RAN, an indication that a relocation request having initiated the session transfer is canceled; and sending an indication from the MSC Server towards a Service Centralization and Continuity Application Server (SCC AS) in the IMS to cancel the session transfer.