The portable terminal in the mobile communication system and the mobile communication system, it includes with aforementioned base station and the portable terminal which communicates

摘要

Even when transmitted waves of multiple systems become approximately out of phase while diversity transmission is performed in a W-CDMA wireless system (1), synchronization establishment determination is more adequately performed. A W-CDMA wireless system comprises a base station and a user equipment. The base station diversity-transmits a common channel and a dedicated channel which is particular to the user equipment; the user equipment measures reception quality of the dedicated channel and a phase difference between respective channels diversity-transmitted from the base station. The user equipment also estimates the bit error rate of the transmit power control bits in the dedicated channel and performs synchronization establishment determination based on the estimated bit error rate and the quality and phase measurements.