Patent ID: 7502596

Claim:
A mobile communication system including a base station and a mobile station configured to communicate with the base station, the system including: a first communication mode between the base station and the mobile station in which a first radio frequency is used for an uplink and a second radio frequency is used for a downlink; a second communication mode between the base station and the mobile station in which the first radio frequency is used for the uplink, and the second radio frequency is shared by the uplink and the downlink; a third communication mode between the base station and the mobile station in which the first radio frequency is shared by the uplink and the downlink and the second radio frequency is used for the downlink; and a mode switcher configured to switch a communication mode between the base station and the mobile station among the first, second, and third communication modes in accordance with data transfer volumes on the uplink and the downlink between the base station and the mobile station, while keeping the base station in synchronization with an adjacent base station so as to prevent interference.