RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD AND RADIO COMMUNICATIONS EQUIPMENT, AND FREQUENCY ARRANGEMENT METHOD

PROBLEM TO BE SOLVED: To utilize a radio wave resource with a high efficiency in radio communication. SOLUTION: A frequency band of 5.2 GHz, having a frequency width of 100 MHz where 5.150 GHz is the lower limit and 5.250 GHz is the upper limit, is assigned to the wireless communication system. In the frequency arrangement of the frequency band, the frequency band with a width of 100 MHz is divided into 4 bands, each having 20 MHz, interval, and one communication channel is provided to each band so as to provide 4 communication channels 611, 612, 613, 614. Furthermore, a 1st protection band 631 for avoiding production of out-band leakage power from the communication channel 611 is provided with communication channels 621, 622, whose frequency band is narrower than the frequency band of the 611, 612, 613, 614 and a 2nd protection band 632, to avoid the generation of out-band leakage power from the communication channel 614 is provided with communication channels 623, 624,whose requency band is narrower than the frequency band of the 611, 612, 613, 614.