Patent ID: 9544821
Date: 2017-01-10
CPC Classifications: H04L,H04W

Claim:
1. A mobile communication system for realizing single radio voice call continuity (SRVCC), the mobile communication system comprising: a first radio access network supporting packet-switched communication; a second radio access network supporting packet-switched communication and circuit-switched communication; a Mobility Management Entity (MME); an enhanced Mobile Switching Center/Media Gateway (MSC/MGW); and a gateway, wherein a first mobile station provides the MME with an Attach Request message or a Tracking Area Update message including information on SRVCC capability of the first mobile station, wherein the gateway is configured to switch a path for voice communications between the first mobile station and a second mobile station, from a path through the first radio access network to a path through the second radio access network in a visited network of the first mobile station, based on the SRVCC capability, and wherein the path through the second radio access network includes a circuit-switched signal exchanged between the first mobile station and the enhanced MSC/MGW via the second radio access network and a VoIP media signal exchanged between the enhanced MSC/MGW and the second mobile station via the gateway.