MOBILE COMMUNICATION SYSTEM, MOBILE STATION DEVICE, BASE STATION DEVICE, AND HANDOVER METHOD

摘要

A mobile station (12) for performing soft handover from a base station (14-1) during communication in which the frame synchronization in the up direction is established to a base station (14-2) calculates the timing difference between the reception timing of a down signal transmitted from the base station (14-1) and the reception timing of a broadcast control channel transmitted from the base station (14-2) at S100 as the amount of timing correction (S126) and corrects the transmission timing of an up ANCH to the base station (14-2) on the basis of the transmission timing of an up signal to the base station (14-1) and the timing difference calculated at the S126, thereby establishing the frame synchronization in the up direction with the base station (14-2) (S128).