Patent ID: 8892098

Claim:
A communication apparatus for dual-mode mobile terminal, comprising: a first communication unit configured to support a communication with a wireless local area network including an Access Point and an Instant Message Service (IMS) server; a second communication unit configured to support a communication with a cellular network accessible to the IMS server in the wireless local area network; and a control unit configured to simultaneously control both the second communication unit to access the IMS server through the cellular network and to set up a media session with a first terminal via the IMS server, and the first communication unit to scan, when the second communication unit starts to set up the media session, available channels of the Access Point for communicating with a second terminal, to generate a preferred channel list (PCL) while the media session is being established with the first terminal through the cellular network, to transmit the generated PCL to the Access Point, and to retrieve a preferred channel among scanned available channels listed in the PCL, the preferred channel being selected by the Access Point in the wireless local area network and configured to subsequently control the first communication unit to communicate with the second terminal through the preferred channel when the media session is established with the first terminal.