Patent ID: 7002948

Claim:
A mobile communication system, comprising a plurality of base stations which are located at appropriate positions within a predetermined area and conduct radio communications with a mobile communication terminal, and an exchange office which is connected with said base stations and conducts an exchange control toward an external network, said exchange office conducting a Time Division Multiplex radio communication by providing a synchronizing signal from said exchange office to each of said base stations, said exchange office further comprising: delay time detection means for detecting an arrival delay time of said synchronizing signal to each of said base stations; computation means for computing a timing correction value for each base station which synchronizes a radio communication timing of all of said base stations on the basis of a delay time detected; and correction means for correcting said synchronizing signal supplied to said base stations according to said timing correction value, wherein: said system comprises switching means for selectively switching an operating conditions thereof to normal and test operating conditions, and makes said delay time detection means operate when said system is in a test operation mode.