Patent ID: 7899029
Filing Date: 2011-03-01
Classification: H04B,H04W

Abstract:
1. A mobile communication system using W-CDMA, comprising a base station having a predetermined communicable area and a user equipment which communicates with said base station if the user equipment is located in said communicable area, said base station and said user equipment communicating with each other via a common channel commonly used by multiple user equipments and a dedicated channel individually set for each user equipment, said user equipment estimating a bit error rate of transmit power control bits transmitted from said base station to the user equipment via said dedicated channel and performing synchronization establishment determination based on the estimated bit error rate, wherein said base station diversity-transmits each channel with respect to said user equipment, and wherein said user equipment comprises: reception quality measurement means which measures a reception quality of a signal including a reception quality of said dedicated channel; phase difference measurement means which measures a phase difference between respective systems diversity-transmitted from said base station; TPC-BER estimation means which estimates the bit error rate of the transmit power control bits in said dedicated channel based on the reception quality of said dedicated channel measured by said reception quality measurement means; and synchronization establishment determination means which performs the synchronization establishment determination in said user equipment based on the bit error rate estimated by said TPC-BER estimation means, the phase difference between the respective systems measured by said phase difference measurement means, and the reception quality measured by said reception quality measurement means.