Channel assigning method in a mobile communication system

A channel assigning method for use in a mobile communication system in which a plurality of base stations constituting small radio zones for performing communication connection with a mobile station are distributed in a service area, a plurality of communication radio channels for use in communication with said mobile station are arranged for each of said base stations, and when a communication connection request is generated, a communication radio channel which satisfies quality conditions of a communication path is selected and assigned, each said base station and said mobile station including means for measuring an interference wave reception level of a communication radio channel, comprising the steps of:

• causing a base station to select, in response to the communication connection request, a communication radio channel having an interference wave reception level which is obtained by said measuring means and satisfies the quality conditions of a communication channel from said plurality of communication radio channels, and transmit information of said communication radio channel to a mobile station as an object of the communication connection request;
• causing said mobile station to select said communication radio channel transmitted by said base station, measure an interference wave reception level, and transmit the measurement result to said base station;
• and
• causing said base station to check whether the measurement result satisfies the quality conditions of a communication path, and assign said communication radio channel to the requested communication when the measurement result satisfies the quality conditions of a communication path.