FIELD: radio engineering, communication.
SUBSTANCE: invention relates to communication. During channel selection, a control unit (208) selects a resource used in sending a response signal from among specific PUCCH resources notified in advance from a base station (100) and PUCCH resources mapped to a CCE, and controls the transmission of the response signal. A response signal generating unit (212) supports implicit signalling with respect to any given response signal, and at the same time as supporting LTE recovery from 2CC, uses a mapping method which, through bits, levels the amount of PUCCH resources which can determine ACK/NACK simply by determining the PUCCH resource regarding which the response signal was transmitted.
EFFECT: capacity of a terminal device to improve the characteristics of a response signal having poor transmission characteristics when ARQ is used in communication using an uplink unit band and a plurality of downlink unit bands associated with the uplink unit band.
20 cl, 52 dwg
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