Patent ID: 7181166

Claim:
A communication channel set up method for setting up a communication channel to be used by a second radio communication system that can use a second frequency band close to but different from a first frequency band that can be used by a first radio communication system, comprising: detecting a utilization state of a prescribed frequency in the first frequency band that can cause interferences to the first radio communication system when a communication channel of a particular frequency in the second frequency band is used by the second radio communication system; and allocating a communication channel other than that of the particular frequency to the second radio communication system when the prescribed frequency in the first frequency band is currently used by the first radio communication system, wherein the detecting step detects the utilization state of the prescribed frequency in the first frequency band that can cause interferences due to spurious components generated outside the second frequency band by the second radio communication system, by predicting frequencies of the spurious components in advance according to a combination of frequencies of the communication channels to be used by the second radio communication system, and wherein said spurious components are different than communication channels.