METHOD AND APPARATUS FOR COMMUNICATING BETWEEN AN IMS UE AND A CSI UE

摘要

A method and an apparatus for communication between an IMS UE and a CSI UE are provided to bind a call/session request having a different identifier via a different domain into one to transmit the call/session request to a legacy IMS(Internet Protocol Multimedia Subsystem) UE, thereby enabling multi-session communication between a CSI(Combination of CS and IMS Services) UE and the legacy IMS UE. A method for communication between a first UE(400) and a second UE(414) comprises the following steps of: allowing a corresponding AS(Application Server)(412) through a voice call associated domain, to which the first UE belongs, to receive a first call request message including a first identifier of the first UE for requesting a voice call service from the first UE(416~422); allowing the AS to acquire and store the second identifier of the first UE for use at a packet exchange service in correspondence to the first identifier; transmitting the first call request message to the second UE through a packet exchange associated domain and providing the voice call service between the first and second UEs(432); allowing the AS to receive a second call request message including the second identifier through the packet exchange associated domain, to which the first UE belongs, for requesting the packet exchange service from the first UE during the voice call service; allowing the AS to generate a combined call request message requesting the voice call service and the packet exchange service together in response to the second call request message; and transmitting the combined call request message to the second UE and providing a combination service of the voice call service and the packet exchange service between the first and second UEs(446).