Terminal apparatus, base station apparatus and communication method

A base station apparatus comprising:

• a processor;
• and
• a memory coupled to the processor, the processor being configured to:
• transmit at least one physical downlink control channel (PDCCH) with a downlink control information (DCI) format;
• and
• transmit a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) that is configured in a “frequency domain resource assignment” field of the DCI format and that is given at least based on a type of search space in which the PDCCH is detected;
• wherein in a case where
• a terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a user equipment specific search space (USS) according to the DCI format with a cell radio network temporary identifier (C-RNTI),
• a set of control channel elements (CCEs) constituting the first PDCCH candidate is the same as a set of CCEs constituting the second PDCCH,
• the first PDCCH candidate and the second PDCCH candidate correspond to the same scrambling, and
• the size of the DCI format corresponding to the first PDCCH candidate is the same as the size of the DCI format corresponding to the second PDCCH candidate, the processor is further configured to transmit the DCI format associated with the first PDCCH candidate.

A communication method for a terminal apparatus, the communication method comprising:

• receiving a physical downlink control channel (PDCCH) with a downlink control information (DCI) format;
• and
• receiving a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) that is configured in a “frequency domain resource assignment” field of the DCI format and that is given at least based on a type of search space in which the PDCCH is detected;
• wherein in a case where
• the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a user equipment specific search space (USS) according to the DCI format with a cell radio network temporary identifier (C-RNTI),
• a set of control channel elements (CCEs) constituting the first PDCCH candidate is the same as a set of CCEs constituting the second PDCCH,
• the first PDCCH candidate and the second PDCCH candidate correspond to the same scrambling, and
• the size of the DCI format corresponding to the first PDCCH candidate is the same as the size of the DCI format corresponding to the second PDCCH candidate, monitoring the DCI format associated with the first PDCCH candidate.