Patent ID: 8254369

Claim:
A radio communication system that includes a terminal and a base station that transmits and receives subframes by OFDMA/TDD with said terminal, wherein said radio communication system comprises: a first base station; and a second base station that is adjacent to said first base station and that establishes frame synchronization with said first base station; wherein said second base station: receives a specific uplink signal contained in uplink subframes transmitted to said first base station from a terminal located at a cell boundary of said first base station and said second base station and, based on the timing of the reception of said specific uplink signal, estimates the timing of the transmission of the header of uplink subframes transmitted from said terminal; and based on said transmission timing of the header of uplink subframes that was estimated, controls the timing of the transmission of downlink subframes transmitted to said terminal; wherein said second base station, when said specific uplink signals are received from a plurality of terminals located at the cell boundary of said first base station and said second base station, estimates the timing of the transmission of the header of uplink subframes that are transmitted from said plurality of terminals based on a reception timing obtained by averaging the timing of the receptions of said specific uplink signals.