Patent ID: 8717954

Claim:
A base station that receives from a mobile station, a reference signal that includes two or more sequences of a fixed length and calculates, as time information for uplink signal synchronization at the mobile station, delay with respect to a reference time of the reference signal, the base station comprising: a first correlator that calculates a first correlation value by correlating known sequences and the reference signal received during a first interval that is set based on the reference time and includes a period equivalent to the fixed length, the first correlator further calculating the delay with respect to the reference time; a second correlator that calculates a second correlation value by correlating the known sequences and the reference signal received during a second interval that includes a period equivalent to the fixed length and is an interval that is different from the first interval; and a corrector that based on a comparison result of the first correlation value and the second correlation value, determines whether to correct the delay calculated by the first correlator.