Patent ID: 7356022

Claim:
A mobile communication system comprising: a base station; and a mobile station, said mobile station receiving control information that notifies said mobile station of transmission of a packet from said base station so that said mobile station can receive the packet, wherein said base station comprises: a base station transmitting/receiving section which transmits/receives the packet to/from said mobile station, and a base station state updating section which notifies said mobile station of transmission/reception state update information that indicates update of a packet receivable state in said mobile station, and said mobile station comprises: a mobile station transmitting/receiving section which transmits/receives the packet to/from said base station, a mobile station state updating section which sets, on the basis of the transmission/reception state update information, one of an active state in which the control information for packet transmission can be received and a suspend state in which the control information for packet transmission cannot be received, and a mobile station ID determination section which detects information of a mobile station ID contained in a shared control channel and determines whether the mobile station ID coincides with a reception mobile station ID of said mobile station that has received the shared control channel.