Patent ID: 8559368

Claim:
A wireless communication system comprising: a mobile station; a first wireless base station for forming a first cell; and a second wireless base station for forming a second cell which is included in the first cell and for being usable by the station when the mobile station is one of at least one registered mobile station; wherein the mobile station stores, in case that the mobile station is one of at least one registered mobile station, a first identifier of the first wireless base station and a second identifier of the second wireless base station; the mobile station transmits, in case that the mobile station is one of at least one registered mobile station, first information to the second wireless base station when a third identifier of a serving wireless base station is other than the first and second identifiers, and transmits second information to the second wireless base station when the third identifier is the first identifier or the second identifier; and the second wireless base station reduces or stops a transmitting power of the second wireless base station, when the second wireless base station detects all of the at least one registered mobile station being out of the first cell and the second cell based on the first information or the second information.