Communication apparatus and communication reception method

摘要

Provided are a base station, whereby the erroneous detection of control information can be reduced, thereby preventing the degradation of the system throughput. A base station (100) maps a downstream allocation control information unit, which is addressed to a terminal (200), to a first resource region, which can be used for any of a downstream control channel region and a downstream data channel region, or to a second resource region, which can be used only for the downstream control channel, so as to transmit the downstream allocation control information unit. In the base station (100), a control unit (102) establishes a scale of the PDCCH region, and a transmission region establishing unit (131) establishes, on the basis of a scale value established by the control unit (102), a mapping region to which the DCI is mapped within the R-PDCCH region and the PDCCH region.

主权项

1. A communication apparatus comprising:
a receiver which, in operation, receives downlink control information transmitted using both of a first resource region and a second resource region included in a subframe or using only the second resource region, the first resource region being available for a downlink control channel and a downlink data channel, the second resource region being available for the downlink control channel; and a decoder which, in operation, identifies both of the first resource region and the second resource region or only the second resource region as a region for decoding, and decodes the identified first and second resource regions or the identified second resource region to obtain the downlink control information, wherein the decoder decodes only the second resource region in a special subframe having a gap period for switching between a downlink and an uplink in a time division duplex (TDD).