Patent ID: 6912394

Claim:
A radio channel assignment judgement method at a radio channel control device of a mobile communication system using an autonomous distributed type channel selection scheme in which whether an assignment of a frequency/radio channel is possible or not is judged according to a receiving level of a level measurement channel at a mobile station, the radio channel control device being provided separately from base stations and mobile stations and connected with the base stations, the radio channel assignment judgement method comprising the steps of: storing and managing an optimal carrier-to-interference ratio (CIR) to be used as a threshold in judging whether the assignment of the frequency/radio channel is possible or not, in correspondence to each value that can be taken by the receiving level of the level measurement channel at the mobile station, in a table in advance; receiving a communication request and a measurement result of the receiving level of the level measurement channel in a radio zone that is a target of the communication request, that are transmitted from the mobile station at a time of making the communication request; and adaptively selecting the optimal carrier-to-interference ratio (CIR) that is corresponding to a received receiving level measurement result from said table, and judging whether the assignment of the frequency/radio channel is possible or not according to a selected carrier-to-interference ratio (CIR).