Patent ID: 7613460

Claim:
A wireless apparatus capable of supporting two types of modulation methods having different multi-value numbers, comprising: a modulation method switching unit configured to switch, when another wireless apparatus to be in wireless connection with the wireless apparatus is capable of supporting said two types of modulation methods, the modulation method between a first modulation method having a smaller multi-value number and a second modulation method having a larger multi-value number, while the wireless apparatus is communicating with said another wireless apparatus; a storing unit configured to store a first threshold value of a parameter indicative of communication environment of transmission path, at which the wireless apparatus can communicate with said another wireless apparatus at least by said second modulation method of said two types of modulation methods; a parameter measuring unit configured to measure said parameter based on a signal received from said another wireless apparatus; a parameter comparing unit configured to compare, when there is a connection request from said another wireless apparatus to the wireless apparatus, said stored first threshold value of the parameter corresponding to said second modulation method with said measured parameter; and a channel allocation determining unit configured to reject, when it is determined by said parameter comparing unit that said measured parameter is lower than said stored first threshold value of the parameter, allocation of a wireless channel to said another wireless apparatus, irrespective as to whether or not communication is actually done under the second modulation method, wherein said storing unit is further configured to store a second threshold value of a parameter indicative of communication environment of transmission path, at which the wireless apparatus can communicate with another wireless apparatus by said first modulation method, and when there is a connection request from another wireless apparatus that supports said first modulation method but not said second modulation method to the wireless apparatus, said parameter comparing unit compares said stored second threshold value of the parameter corresponding to said first modulation method with the parameter measured by said parameter measuring unit, and when it is determined by said parameter comparing unit that said measured parameter is lower than said stored second threshold value of the parameter, said channel allocation determining unit rejects allocation of a wireless channel to said another wireless apparatus that supports said first modulation method but not said second modulation method.