Patent ID: 8279830
Filing Date: 2012-10-02
Classification: H04W

Abstract:
1. A method of performing a handover by a mobile station (MS) which has a circuit-switched (CS) connection and a packet-switched (PS) connection with a cell in a wireless mobile communication system, the method comprising: receiving, by the MS, a PS Handover Command message and a CS Handover Command message separately from a network if the MS does not support a Dual Transfer Mode (DTM) handover, wherein the PS Handover Command message includes resource information for performing a PS handover with a new cell, and wherein the CS Handover Command message includes resource information for performing a CS Handover with the new cell; receiving, by the MS, a DTM Handover Command message from the network if the MS supports the DTM handover, wherein the DTM Handover Command message includes resource information for performing the CS handover and the PS handover with the new cell; performing, by the MS, the CS handover and the PS handover with the new cell based either on the resource information of the DTM Handover Command message or on both the resource information of the PS Handover Command message and the resource information of the CS Handover Command message, in order to establish a CS connection and a PS connection with the new cell; and transmitting, by the MS, a Handover Complete message to the network after the CS handover and the PS handover are completed.