Terminal and Response Signal Transmission Method

1. A terminal apparatus, comprising: a receiver that receives downlink allocation control information transmitted through a control channel of at least one of a plurality of component carriers, and downlink data transmitted through a data channel in first communication with a base station apparatus using the plurality of component carriers including a primary component carrier, or second communication with the base station apparatus using only the primary component carrier; a generator that generates response signals indicating success or failure in receiving the downlink allocation control information and the downlink data; and a controller that configures phase points of the response signals, wherein: at least one of the receiver, the generator and the controller is included in a processor, and a phase point of the one response signal indicating the success or failure in reception for the primary component carrier in the second communication is configured to be identical to respective phase points of the two response signals indicating the success or failure in reception for the primary component carrier identical to the success or failure in reception for the primary component carrier in the second communication and the success or failure in reception which is a state in which the downlink allocation control information is not received through component carriers other than the primary component carrier, wherein a pair of phase points of the two response signals indicating the success or failure in reception for M (provided that, M is a natural number equal to 2 or above) component carriers in the first communication using the M component carriers is identical to a pair of phase points of the two response signals indicating the success or failure in reception for the component carriers indicating the success or failure in reception for the component carriers identical to the M component carriers in the first communication using N (provided that, N is a natural number greater than M) component carriers, which is identical to the success or failure in reception for the M component carriers in the first communication using the M component carriers and the success or failure in reception which corresponds to a state in which the allocation control information is not received through all (N-M) component carriers other than the M component carriers.

2. A response signal transmission method comprising: receiving downlink allocation control information transmitted through a control channel of at least one of a plurality of component carriers and downlink data transmitted through a data channel in first communication with a base station apparatus using the plurality of component carriers including a primary component carrier, or second communication with the base station apparatus using only the primary component carrier; generating, in the second communication, one response signal indicating success or failure in receiving the downlink data of the primary component carrier, and generating, in the first communication, two response signals indicating success or failure in receiving the allocation control information and the data of the plurality of component carriers; configuring phase points of the response signals, wherein: success or failure in receiving the downlink allocation control information and the downlink data is indicated by phase points of the response signals, and a phase point of the one response signal indicating the success or failure in reception for the primary component carrier in the second communication is configured to be identical to respective phase points of the two response signals indicating the success or failure in reception for the primary component carrier identical to the success or failure in reception for the primary component carrier in the second communication and the success or failure in reception which corresponds to a state in which the downlink allocation control information is not received through component carriers other than the primary component carrier, wherein a pair of phase points of the two response signals indicating the success or failure in reception for M (provided that, M is a natural number equal to 2 or above) component carriers in the first communication using the M component carriers is identical to a pair of phase points of the two response signals indicating the success or failure in reception for the component carriers indicating the success or failure in reception for the component carriers identical to the M component carriers in the first communication using N (provided that, N is a natural number greater than M) component carriers, which is identical to the success or failure in reception for the M component carriers in the first communication using the M component carriers and the success or failure in reception which corresponds to a state in which the allocation control information is not received through all (N-M) component carriers other than the M component carriers.