Patent ID: 7961677

Claim:
A wireless base station which transmits radio signals between itself and a plurality of mobile stations by means of OFDMA, comprising: multiplexing means for generating orthogonal frequency division multiplexed user data; channel assignment control means for selecting a plurality sets of sub-carriers among a plurality of sub-carriers dispersed on a frequency domain so as to constitute a radio frame containing sub-channels assigned for each of the plurality sets of sub-carriers, and for setting the user data and control data regarding setting of the user data in the radio frame by means of orthogonal frequency division multiplexing, in the radio frame; and transmission means for transmitting a radio signal containing the radio frame, wherein, the channel assignment control means is constituted so as to divide the radio frame into 2 zones for the control and user data, divide all sub-channels in the zone for the control data into groups for each of sectors of the radio signal, allocate the corresponding divided sub-channel groups for the control data, and allocate all the sub-channels in the zone for the user data.