| 摘要 |
<p>Multiple downlink and uplink component carriers are allocated to a base station device, and a mobile station device (2) communicates with the base station device using the component carriers. The mobile station (2) has a downlink control channel detection unit (67) that detects a downlink control channel from multiple search spaces wherein a downlink control channel signal is detected; and a carrier component identification unit (53a) that identifies, from the search space in which is located the downlink control channel detected by the downlink control channel detection unit (67), a component carrier that is controlled with downlink control information to be transmitted to the mobile station device with the downlink control channel. Thus, it is possible to identify the component carrier controlled by downlink control information (DCI) that is transmitted with a physical downlink control channel (PDCCH) without increasing the encoding ratio of the physical downlink control channel (PDCCH).</p> |
