Abstract: A mobile communication system is disclosed having a plurality of base stations controllable from a single control station to transmit control signals from said control station to respective geographic zones. Fault detecting means capable of detecting transmission lapses, waveform irregularities, or phase irregularities, is provided in each base station for cutting off transmission when a fault is detected.

Abstract: A control system for mobile radio communication, in which the whole service area is composed of a plurality of small radio service zones in each of which communication is sufficiently possible with the transmitting power of any of mobile stations belonging to the service zone, a base station of each of the small radio service zones and a control station for controlling the whole service area are interconnected through a binary code transmission line, and in order to prevent simultaneous transmission of the control signal from a plurality of mobile stations when the mobile stations in the whole service area achieve transmission and reception of the control signal between each of them and the control station over a common control channel, the control station transmits to the mobile stations information representative of the busy or idle status of the common control channel from the mobile stations by the interruption and transmission of an idle line indication signal.