Terminal device and retransmission control method

摘要

Provided are a terminal device and a retransmission control method by which, when carrier aggregation communication using a plurality of downlink unit bands is applied, the quality of downlink data transmitted by each downlink unit band can be maintained, while suppressing the increase in overhead of downlink allocation control information. In a terminal (200), a control unit (208) performs transmission control of a response signal on the basis of a reception success/failure pattern of downlink data received by a downlink unit band which is included in a unit band group set in the terminal itself. The control unit (208) makes the phase points of the response signal different in accordance with a number of downlink data which has been successively received, namely, a number of ACK, in the reception success/failure pattern, and makes the phase points of the response signal between reception success/failure patterns identical when there are a plurality of reception success/failure patterns having the same ACK number.

主权项

1. A terminal configured with one or more downlink component carrier(s) comprising:
a control information detecting section configured to detect downlink assignment information indicating one or more resources for downlink data, each of the one or more resources being assigned to one of the one or more downlink component carrier(s); a decoding section configured to decode the downlink data, which is transmitted in the one or more resources indicated by the detected downlink assignment information; and a transmission controlling section configured to transmit one or more response signals for the decoded downlink data, wherein:
each response signal denotes an outcome of decoding downlink data, or denotes a Discontinuous Transmission (DTX) representing that the outcome is not transmitted;when downlink component carriers including a first downlink component carrier and a second downlink component carrier are configured, response signals for a plurality of downlink data in the downlink component carriers are transmitted using at least one phase point and at least one resource index of at least one uplink control channel depending on an outcome of decoding each of the plurality of downlink data; anda first outcome that a first response signal for downlink data in the first downlink component carrier denotes with a first phase point, with which a second response signal for downlink data in the second downlink component carrier denotes the DTX, is the same as the first outcome, which a third response signal for downlink data in the first downlink component carrier denotes with the same first phase point when only the first downlink component carrier is configured, such that:when the first downlink component carrier and the second component carrier are configured, an acknowledgment (ACK) for downlink data in the first downlink component carrier and a DTX for downlink data in the second downlink component carrier are denoted by the first response signal and the second response signal with the first phase point; andwhen only the first downlink component carrier is configured, an ACK for downlink data in the first downlink component carrier is denoted by the third response signal with the same first phase point.