TERMINAL DEVICE AND RETRANSMISSION CONTROL METHOD

摘要

Provided are a terminal device and a retransmission control method which enable the reduction of the overhead of an uplink control channel when ARQ is applied in communication using an uplink unit band and a plurality of downlink unit bands associated with the uplink unit band. In a terminal (200), when the number of downlink unit bands included in a unit band group is three, a control unit (209) transmits a bundle response signal using a resource in a basic region of an uplink control channel associated with a downlink control channel in a basic unit band when downlink assignment control information transmitted in the basic unit band is received and no error is detected in downlink data transmitted through a downlink data channel indicated by the downlink assignment control information, and the control unit transmits the bundle response signal using a resource in an additional region of the uplink control channel, which is signaled in advance by a base station (100), when the reception of the downlink data transmitted in the basic unit band has not succeeded.