BASE STATION DEVICE, TERMINAL DEVICE, COMMUNICATIONS METHOD, INTEGRATED CIRCUIT, AND COMMUNICATIONS SYSTEM

摘要

A base station apparatus in the present invention includes a terminal-specific control channel generation unit that generates terminal-specific control channels mapped in a terminal-specific control channel region that is configured specifically to the terminal apparatus and that is constituted by a prescribed number of resource block pairs and transmitted. If a number of candidate specific control channels monitored by the terminal apparatus is smaller than or equal to a number of resource block pairs in the terminal-specific control channel region at each aggregation level, which indicates a number of the enhanced control channel elements used in each of the terminal-specific control channels, each of the candidate terminal-specific control channels corresponds to a different resource block pair in the terminal-specific control channel region. The terminal-specific control channels are mapped in one of the candidates. As a result, in a radio communication system in which a base station and a terminal communicate with each other, the base station can efficiently transmit control information to the terminal, which is advantageous.