| 摘要 |
In order to provide a search space configuration that is suitable for a communication system in which a plurality of component carriers are aggregated into a wide band, the present invention provides a base station apparatus having a control information generation section that generates, per fundamental frequency block, a downlink control information piece for demodulating a data channel that is transmitted for each of a plurality of fundamental frequency blocks assigned to a user terminal, a determining section that determines, per fundamental frequency block, a search space which is a candidate area where the downlink control information piece is arranged, and a transmission section that transmits a downlink control channel in which the search space containing the downlink control information piece is arranged. The control information generation section arranges respective downlink control information pieces corresponding to the fundamental frequency blocks in a downlink control channel of a specific fundamental frequency block among the fundamental frequency blocks, and using a fundamental frequency block-specific offset value and a user terminal-specific offset value, the determining section distributes positions of search spaces such that the search spaces are separate between fundamental frequency blocks and between user terminals. |
