A radio communication system has a base station(s), a plurality of mobile stations, and a line controller connected to the base station. The line controller has a first memory for keeping track of each communication channel for each base station as to whether the communication channel is occupied or idle. The base station has a second memory for storing an idle communication channel stored in the first memory as a reserved channel. The base station is responsive to a connection request issued from an arbitrary calling mobile station and including designation of a called mobile station to designate a reserved channel stored in the second memory of an associated base station as a communication channel for the calling and called mobile stations to establish a connection with the mobile stations.