| 主权项 |
1. A communication apparatus comprising:
a receiver which, in operation, receives a control signal including first downlink control information that is common to a plurality of terminal apparatuses and second downlink control information that is directed to at least one specific terminal apparatus of the plurality of terminal apparatuses, the first downlink control information being mapped to one of a plurality of first mapping candidates that are included in a common search space, which is configured in a Physical Downlink Control Channel (PDCCH) region of a subframe, and the second downlink control information being mapped to one of a plurality of second mapping candidates that are included in a user-specific search space, which is configured in an extended Physical Downlink Control Channel (extended PDCCH) defined within a Physical Downlink Shared Channel (PDSCH) region of the subframe, and receives decoding area information that indicates whether the extended PDCCH should be decoded for each terminal apparatus; and a decoder which, in operation, according to the decoding area information, decodes each of the plurality of first mapping candidates in the PDCCH area or decodes each of the plurality of first mapping candidates in the PDCCH area and each of the plurality of second mapping candidates in the extended PDCCH to acquire the first downlink control information and the second downlink control information that is directed to the communication apparatus itself, wherein a number of the second mapping candidates included in the user-specific search space equals to or is more than a number of the first mapping candidates included in the common search space. |
