Patent ID: 8340028

Claim:
A mobile station that establishes a shared data channel and a signaling control channel and performs bidirectional communication between the mobile station and a radio access network apparatus, comprising: a signaling control channel reception unit configured to receive the signaling control channel continuously when there is traffic data addressed to the mobile station, the signaling control channel being also used in discontinuous reception; a discontinuous reception unit configured to perform discontinuous reception of the signaling control channel when there is no traffic data addressed to the mobile station for a predetermined time; a data presence or absence decision unit configured to determine presence or absence of traffic data addressed to the mobile station by checking whether an identifier of the mobile station is included in the signaling control channel when receiving the signaling control channel; and a shared channel receiving unit configured to, when it is determined that there is traffic data addressed to the mobile station, receive a shared data channel corresponding to reception timing of the signaling control channel for which it is determined that there is traffic data addressed to the mobile station.