Patent ID: 7356355

Claim:
A wireless base station for reducing interference between the base station and a specified mobile station caused by control signals emitted by other wireless base stations, the base station comprising: a receiving unit for receiving a control signal requesting channel allocation information through each of a plurality of antennas; a calculating unit for calculating a weight coefficient for the control signal requesting channel allocation information received by each of the plurality of antennas; a combining unit for combining the control signal requesting channel allocation information received by each of the plurality of antennas and the calculated weight coefficient in order to form an array antenna pattern; a transmitting unit for transmitting a control signal containing channel allocation information to the mobile station; and a control unit for instructing the transmitting unit to temporarily raise transmission power and use the array antenna pattern to transmit the control signal containing channel allocation information to the mobile station, and when (1) communication quality is poor and (2) a time lapse between the receiving unit receiving the control signal requesting channel allocation information from the mobile station and the transmitting unit transmitting the control signal containing channel allocation information to the mobile station exceeds a predetermined length, the control unit forces the transmitting unit to use an omni-directional pattern to transmit the control signal containing channel allocation information to the mobile station, and when (1) communication quality is high and (2) the time lapse exceeds a predetermined length, the control unit forces the transmitting unit to temporarily lower transmission power and use an omni-directional pattern to transmit the control signal containing channel allocation information to the mobile station.