Patent ID: 7542433

Claim:
A transmission apparatus in a radio communication system using a communication mode selection table for selecting a communication mode according to a channel condition, said table being provided from a correspondence relationship between a carrier to interference ratio and an error rate for each modulation coding scheme and indicating a correspondence relationship between the communication mode and the carrier to interference ratio, the transmission apparatus comprising: a transmission section that transmits calibration data for updating the communication mode selection table; and a table rewriting section that changes the correspondence relationship between the carrier to interference ratio and the error rate in the communication mode based on the error rate when the transmitted calibration data is transmitted through a communication channel, and rewrites the correspondence relationship between the communication mode and the carrier to interference ratio by the change; and a decision section that decides the communication mode for transmitting data based on the rewritten communication mode selection table, wherein: the calibration data is assigned to a slot which becomes empty as a result of scheduling, and when an error rate of the calibration data does not satisfy a desired error rate, the table rewriting section rewrites the correspondence relationship between the communication mode and the carrier to interference ratio based on the error rate of the calibration data and the carrier to interference ratio.