Base station, mobile station, and channel quality information reporting method

A mobile station that communicates with a base station that divides a system bandwidth into M blocks and allocates data for the divided blocks in order to transmit the data, the mobile station comprising:

• an N reception portion that receives from the base station the number N of the blocks for which channel quality information is reported among the M blocks, the number N being set in accordance with an amount of traffic;
• an N selection portion that selects N pieces of channel quality information from M pieces of channel quality information that correspond to the M blocks;
• a remaining channel quality information averaging portion that averages pieces of channel quality information excluding the selected N pieces of channel quality information;
• and
• a feedback information generation portion that generates feedback information for reporting the N pieces of channel quality information and the averaged channel quality information to the base station.

A channel quality information reporting method in a communications system including a base station and a mobile station that communicates with the base station, wherein the base station divides a system bandwidth into M blocks and allocates data to be transmitted to a mobile station for the divided blocks in order to transmit the data, the channel quality information reporting method comprising:

• a setting step, wherein the number N of blocks for which the mobile station reports channel quality information among the M blocks is set in accordance with an amount of traffic;
• a reporting step, wherein the base station reports the number N of blocks to the mobile station;
• a receiving step, wherein the mobile station receives the number N of blocks from the base station;
• a selecting step, wherein the mobile station selects N pieces of channel quality information from M pieces of channel quality information corresponding to the M blocks;
• an averaging step, wherein the mobile station averages pieces of channel quality information excluding the selected N pieces of the channel quality information;
• and
• a reporting step, wherein the mobile station reports the N pieces of channel quality information and the averaged channel quality information to the base station.