Patent ID: 8687587
Filing Date: 2014-04-01
Classification: H04L,H04W

Abstract:
1. A method, comprising: anchoring, at a first function in a multimedia subsystem, session signaling for a communication session established between a user element and a remote endpoint; providing, from the multimedia subsystem, centralized service control for the communication session, wherein the centralized service control is provided when the user element is served by a circuit-switched subsystem and when the user element is served by a packet subsystem; during the communication session, effecting a radio layer handover of the user element from a transferring-out subsystem to a transferring-in subsystem, wherein the transferring-out subsystem is the packet subsystem, wherein the transferring-in subsystem is the circuit-switched subsystem, and wherein the centralized service control is maintained across the radio layer handover; and wherein the radio layer handover includes representing a handover function as a target mobility management entity (MME) to the transferring-out subsystem and the handover function as a source mobile switching center (MSC) to the transferring-in subsystem.