Communication apparatus and method that can promptly and efficiently perform decoding/processing of a downlink control information that is related to a search space

摘要

A communication system, a mobile station apparatus, a base station apparatus, and a processing method are provided that can perform decoding processing of a PDCCH related to a search space efficiently, and can perform communication promptly. A mobile station apparatus for performing communication with a base station apparatus in a mobile communication system: perform monitoring of a physical downlink control channel in an extension search space in accordance with an instruction from the base station apparatus.

主权项

1. A mobile station apparatus that is configured to communicate with a base station apparatus, the mobile station apparatus comprising:
a reception unit configured to perform detecting of Downlink Control Information with CRC (cyclic redundancy check) bits scrambled by C-RNTI (cell-radio network temporary identity) in a first search space which is commonly determined for mobile station apparatuses in a cell and a second search space which is a mobile station apparatus specific search space determined based on at least the C-RNTI; and the reception unit configured to perform detecting of the Downlink Control Information with the CRC bits scrambled by the C-RNTI in a third search space which is different from the first search space and the second search space, the third search space being configured by using at least a dedicated RRC (Radio Resource Control) signaling which includes at least information indicating a location of the third search space, wherein the first search space, the second search space and the third search space are configured in a same component carrier.