Radio communication apparatus and method

摘要

A radio communication apparatus for use in a communication system where a downlink frequency band includes a plurality of frequency blocks including one or more carrier frequencies and one or more of the frequency blocks are used for data transmission to a single user. The apparatus comprises a transmission unit configured to transmit a signal to a communication opponent; and a reception unit configured to receive an uplink control signal including a CQI and a detected ACK or NACK from a communication opponent. If the transmitted signal includes data, the ACK or NACK included in the uplink control signal received at the reception unit is detected, and the CQIs included in the uplink control signal received at the reception unit are determined as a reference value calculated from a plurality of measurement results over the overall downlink frequency band by selecting measurement results for a predetermined number of frequency blocks from reception signal qualities measured for a plurality of frequency blocks included in the downlink frequency band at a predetermined time instant and difference values between the selected measurement results and the reference value.