Synchronization control circuit for TDMA cellular communication system

Claim 1

A synchronization control circuit for controlling a time base of a transmitter/receiver mounted on a mobile station which is included in a TDMA (Time Division Multiple Access) cellular digital mobile communication system for selectively interchanging digital signals with a number of mobile stations located in cells each being defined by one of a plurality of base stations which share a plurality of radio frequency carries different in frequency and time base from one another on a time division basis, said circuit comprising; a plurality of time base counter circuits each being assigned to respective one of said plurality of carrier waves for generating various timing signals necessary for said transmitter/receiver in response to clock pulses which are generated by a clock pulse source built in said transmitter/receiver; a control signal source for generating counter circuit control signals for causing each of said plurality of time base counter circuits to start counting, stop counting, or reading counts thereof; and single counter controller means shared by said plurality of time base counter circuits and responsive to said control signals for selectively producing count outputs of one of said plurality of time base counter circuits as a time base signal of said transmitter/receiver.