| 摘要 |
PROBLEM TO BE SOLVED: To provide a base station capable of suppressing an increased overhead amount of an uplink control channel (PUCCH) at a terminal, if a channel selection is applied as the transmission method of a response signal at carrier aggregation communication using a plurality of downlink unit bands.SOLUTION: In a base station 100, the response signal indicates success/failure of downlink data decoding or DTX without transmission of the success/failure of decoding. When a plurality of downlink component carriers are set, a plurality of response signals to a plurality of downlink data in the plurality of downlink component carriers are transmitted. When a plurality of response signals are transmitted, the plurality of response signals are transmitted using a phase point according to the success/failure of decoding each of the plurality of downlink data, and one of a plurality of uplink control channel resources for response signals. |
