Patent ID: 8755328

Claim:
A relay device, comprising: an uplink signal relaying unit that performs an uplink signal relaying operation that amplifies an uplink signal transmitted through an uplink channel from a mobile station and re-transmits the amplified uplink signal to a base station; a frequency information acquisition unit that acquires frequency information that represents a frequency band that said mobile station uses for the uplink channel periodically or at predetermined timings; an uplink signal detection unit that determines whether or not the average reception power of the uplink signal in the frequency band represented by the frequency information acquired by said frequency information acquisition unit exceeds a predetermined threshold; a control unit that controls the uplink signal relaying operation performed by said uplink signal relaying unit based on a determined result of said uplink signal detection unit; and a downlink signal relaying unit that performs a downlink signal relaying operation that amplifies the downlink signal transmitted through a downlink channel from said base station and re-transmits the amplified downlink signal to said mobile station, wherein said frequency information acquisition unit periodically acquires system information containing said frequency information from the downlink signal received from said base station, wherein said frequency information acquisition unit acquires frequency information that represents a first frequency band that said mobile station used for a first channel, wherein said uplink signal detection unit determines whether or not the average reception power of the uplink signal in said first frequency band exceeds a first threshold, and wherein said control unit causes said uplink signal relaying unit to start the uplink signal relaying operation if the average reception power of the uplink signal in said first frequency band exceeds said first threshold.