Patent ID: 8705479

Claim:
A communications system for exchange of information between communications apparatuses by a multicarrier transmission mode using a plurality of subcarriers, the communication system comprising: a transmission data generator configured to generate frequency band information indicating which frequency band is to be used for transmission of data information between said communication apparatuses; a transmitter configured to transmit the frequency band information by using a specific frequency band which is set from among a plurality of frequency band assigned to the communications system, and to transmit data information by using at least one frequency band set from among said plurality of frequency bands; and a receiver configured to receive the frequency band information by using the specific frequency band. Wherein the frequency band set as said at least one frequency band set from among said plurality of frequency bands, other than the specific frequency band, is made variable, wherein at the time of establishing the wireless channel, the frequency band usable by the communications apparatus is restricted, and said at least one frequency band, other than the specific frequency band, are dynamically assigned within that restricted frequency band.