Upon handover, a mobile station receives, from the movement origin base station, information on the movement destination base station and information relating to a sequence to be used for transmitting a random access signal to the movement destination base station. The mobile station receives a synchronization channel signal transmitted from the movement destination base station. The mobile station transmits the random access signal to the movement destination base station at a timing offset by a prescribed period from a timing of receiving a synchronization channel and at a frequency corresponding to that of the synchronization channel. A position of the timing/frequency used for transmitting the random access signal for the handover is used exclusively by the random access signal transmitted from the mobile terminal for which a handover is being performed or is used exclusively at the same time by a plurality of mobile stations for which handovers are performed.