Terminal device, base station device, transmission method, and receiving method

摘要

A control unit (208) employs instruction information which instructs a unit band which is employed in the transmission of a response signal to transmit the response signal. A first unit band and a second unit band which differs from the first unit band are included in the plurality of unit bands. The first unit band is employed in the transmission of the response signal when downstream data is simultaneously assigned to both the first unit band and the second unit band. When at least the second unit band downstream circuit data is assigned, the second unit band is employed in making a notification of the instruction information. When the downstream circuit data is simultaneously assigned to both the first unit band and the second unit band, the unit band which is denoted in the instruction information is the first unit band.

主权项

1. A terminal apparatus that communicates with a base station apparatus using a plurality of component carriers, the terminal apparatus comprising:
circuitry, which, in operation generates a response signal using error detection results of downlink data transmitted using the plurality of component carriers; and a transmitter, which, in operation, transmits the response signal using a component carrier indicated by indication information that indicates a component carrier to be used for transmission of the response signal, wherein: the plurality of component carriers include a first component carrier and a second component carrier which is different from the first component carrier, the first component carrier being a component carrier used for transmission of the response signal when downlink data is simultaneously assigned to both the first component carrier and the second component carrier, the first component carrier being a component carrier not used to indicate the indication information when multiple component carriers are used by the base station, and the second component carrier being a component carrier used for transmission of the response signal when downlink data is assigned to only the second component carrier; the indication information is indicated from the base station apparatus using the second component carrier when downlink data of at least the second component carrier is assigned; and when downlink data is simultaneously assigned to both the first component carrier and the second component carrier, the component carrier indicated by the indication information is the first component carrier, and when downlink data is assigned to only the second component carrier, the carrier indicated by the indication information is the second component carrier.