Patent ID: 8583124

Claim:
A base station comprising: a downlink perch channel signal transmission power controller unit that changes a transmission power of a downlink perch channel signal, when a first condition is satisfied; and an uplink reception sensitivity controller unit that changes an uplink reception sensitivity, when a second condition is satisfied after the first condition is satisfied, wherein the downlink perch channel signal transmission power controller unit determines that the first condition is satisfied and reduces the transmission power of the downlink perch channel signal, when it is detected that an unregistered mobile station enters a cell under the control of the base station and when a frequency of communication performed by the unregistered mobile station fails to be changed to a frequency other than a frequency used in the base station, and wherein the uplink reception sensitivity controller unit determines that the second condition is satisfied after the first condition is satisfied and reduces the uplink reception sensitivity, when the transmission power of the downlink perch channel signal is reduced by a predetermined value or more.