Radio channel search system

Claim 1

A radio channel search system in use with a communication system based on a multi-channel access system in which a plurality of moving units and at least one master station arranged as a counterpart of each of said moving units are provided, a plurality of radio channels are assigned to each of said plurality of moving units, in a speech mode the moving unit selects an idle channel from those radio channels, to set up a radio communication path between said moving unit and said master station; characterized in that said master station (12a) and each moving unit (14a-14n) include means (12a-4, 14a-4) for storing the data of the numbers representing priority channels which are selected from radio channels and whose number is smaller than that of radio channels; control means (12a-3, 14a-3) for controlling the receive-ready mode by using said priority channel, and connection control means (12a-2, 14a-2), and wherein in the receive-ready mode, said receive-ready control means (12a-3, 14a-3) sequentially make the reception search of said priority channels according to the priority channel numbers stored in said priority channel storing means (12a-4, 14a-4), and stop the supply of electric power to a receiving circuit sec­tion during the period that no reception search is per­formed, said connection control means (12a-2, 14a-2) detect an idle channel by said receive search when a cell unit sends a speech path formation request to a called unit in the receive-ready mode, and make a con­nection control between one of said units (14a-14n) and said master station (12a) by using said idle channel, and when receiving a connection request in said receive search mode, said connection control means (12a-2, 14a-2) stop the receive search operation, and a predetermined connection control between one of said units and said master station (12a) by a radio channel (13a-13n) through which said connection request is received.