Base station and wireless communication system

A wireless base station comprising:

• a power control unit for controlling a transmission power of a downlink signal;
• a reference information acquisition unit for acquiring, from a neighbor base station, reference information necessary for receiving an uplink control signal transmitted from a mobile station connected to the neighbor base station;
• and
• a reference information storing unit for storing the reference information acquired by the reference information acquiring unit,
• wherein the wireless base station comprises:
• a first control signal receiving unit for receiving a first uplink control signal used by a mobile station connected to the wireless base station to notify the wireless base station of a reception state of the downlink signal, and for requesting the power control unit to control the transmission power based on the received first uplink control signal;
• and
• a second control signal receiving unit for receiving a second uplink control signal used by a mobile station connected to the neighbor base station to notify the neighbor base station of a reception state of the downlink signal by referring to the reference information stored in the reference information storing unit, and for requesting the power control unit to control the transmission power based on a content of the received second uplink control signal, and
• wherein the power control unit is configured to control the transmission power of the downlink signal based on the request to control the transmission power from the first control signal receiving unit and the request to control the transmission power from the second control signal receiving unit.