Abstract: The service area of the radio telephone system is divided into a plurality of radio zones and a base station is installed in each radio zone. The base station is connected to a control unit through a common control channel and a plurality of speech channels, the control unit is connected to an ordinary telephone network, and the control unit is controlled by first and second sequence controllers for the radio system and an exchange control unit, respectively.In a modification, each first and second sequence controller comprises a plurality of discrete sequence controllers classified according to their functions.

Abstract: The service area of the system is divided into a plurality of overlapping radio zones and a mobile-system base station is installed in each zone. The mobile-system base stations are assigned with a common control channel and each station is assigned with a plurality of speech channels which are commonly controlled by the control channel. Where a mobile body originates a transmission, the intensities of signals received by respective stations which have resulted from a signal transmitted by the mobile body are compared so as to designate an idle speech channel of a station which has received a signal having the maximum intensity among mobile-system base stations including the idle speech channel.