MOBILE COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a mobile communication system capable of shortening time required up to the attainment of time alignment in the mobile communication system using a code division multiple access(CDMA) signal using a synchronizing type code or a semi-synchronizing type code as a diffusion code. SOLUTION: A 3rd station 5 for transmitting a time reference signal is prepared in addition to a base station 1 and plural mobile stations 2 to 4, the station 1 receives the time reference signal from the station 5 and transmits a base station time signal to respective mobile stations 2 to 4 and the stations 2 to 4 execute the transmission of up lines so as to obtain the time alignment of signals on the up lines of the station 1 by receiving the time reference signal from the station 5 and the base station time signal from the station 1 and finding out propagation time between the reference time of the station 1 and the station 1. Consequently time required for the attainment of time alignment can be shortened, the time alignment state can be continued by quickly corresponding to a change in the state due to the movement of each mobile object and communication of high quality can be continued.