| 摘要 |
Disclosed is a radio base station (100) provided with: a reception unit (111) that receives, from a radio terminal, a reference signal multiplexed with an ACK or a NACK; an ACK/NACK detection unit (121) that detects the ACK or NACK multiplexed onto the reference signal, using a detection criterion (1) set such that the ACK false-positive rate is lower than the NACK false-positive rate; an ACK/NACK detection unit (123) that detects the ACK or NACK multiplexed onto the reference signal, using a detection criterion (2) set such that the relationship between the ACK false-positive rate and the NACK false-positive rate is different from that in the detection criterion (1); a transmission/retransmission control unit (122) that controls retransmission of data in accordance with the detection result from the ACK/NACK detection unit (121); and a channel estimation unit (124) that performs channel estimation using the reference signal from which the ACK/NACK is removed in accordance with the detection result from the ACK/NACK detection unit (123).
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