To reduce the isolation (separation) for a radio frequency needed by a receiver circuit for application of a communication system.

The prescribing method for the channel group of the wireless communication system comprises a step (S10) for measuring the values of receive signal parameters for electromagnetic wave transmission to multiple remote stations, a step (S12) for determining the probability corresponding to the measured signal parameter values for the remote stations, a step (S14) for assigning a desired number of channel groups of communication channels to the remote stations, and a step (S16) for establishing the borders of the respective groups so as to provide nearly equal quality of service for the respective channel groups according to the determined probability.