Terminal apparatus, base station apparatus, and communication method

A base station apparatus comprising:

• a processor;
• and
• a memory coupled to the processor and storing instructions, wherein the processor is configured to execute the instructions to
• transmit a physical downlink control channel (PDCCH) accompanied with a downlink control information (DCI) format, and
• transmit a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) set to a “Frequency domain resource assignment” field of the DCI format, wherein
• the RIV is based on at least a type of a search space in which the PDCCH is detected, and
• in a case that
• the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a UE-specific search space (USS) according to the DCI format accompanied with a cell radio network temporary identifier (C-RNTI) in one control resource set (CORESET),
• a period of the CORESET is one orthogonal frequency division multiplexing (OFDM) symbol,
• the CORESET is a non-interleaved CORESET,
• one of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 8 and the other of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 16,
• a lowest index of a control channel element (CCE) constituting the first PDCCH candidate is identical to a lowest index of a CCE constituting the second PDCCH candidate,
• a higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, or
• a size of the DCI format corresponding to the first PDCCH candidate is identical to a size of the DCI format corresponding to the second PDCCH candidate, the processor is further configured to execute the instructions to
• transmit the PDCCH accompanied with the DCI format only in the first PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
• transmit the PDCCH accompanied with the DCI format only in the second PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
• consider that the PDCCH accompanied with the DCI format is transmitted in the second PDCCH candidate in a case that the PDCCH accompanied with the DCI format is transmitted in the first PDCCH candidate,
• consider that the PDCCH accompanied with the DCI format is transmitted in the first PDCCH candidate in a case that the PDCCH accompanied with the DCI format is transmitted in the second PDCCH candidate,
• transmit the PDCCH accompanied with the DCI format only in the PDCCH candidate having the aggregation level of 8 out of the first PDCCH candidate and the second PDCCH candidate,
• transmit the PDCCH accompanied with the DCI format only in the PDCCH candidate having the aggregation level of 16 out of the first PDCCH candidate and the second PDCCH candidate,
• consider that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 16 in a case that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 8, or
• consider that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 8 in a case that the PDCCH accompanied with the DCI format is transmitted in the PDCCH candidate having the aggregation level of 16.

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

• receiving a physical downlink control channel (PDCCH) accompanied with a downlink control information (DCI) format;
• and
• receiving a physical downlink shared channel (PDSCH) corresponding to a resource indication value (RIV) set to a “Frequency domain resource assignment” field of the DCI format, wherein:
• the RIV is based on at least a type of a search space in which the PDCCH is detected;
• and
• in a case that
• the terminal apparatus is configured to monitor a first PDCCH candidate in a common search space (CSS) and a second PDCCH candidate in a UE-specific search space (USS) according to the DCI format accompanied with a cell radio network temporary identifier (C-RNTI) in one control resource set (CORESET),
• a period of the CORESET is one orthogonal frequency division multiplexing (OFDM) symbol,
• the CORESET is a non-interleaved CORESET,
• one of the first PDCCH candidate and the second PDCCH candidate is of an aggregation level of 8 and the other of the first PDDCH candidate and the second PDCCH candidate is of an aggregation level of 16,
• that a lowest index of a control channel element (CCE) constituting the first PDCCH candidate is identical to a lowest index of a CCE constituting the second PDCCH candidate,
• a higher layer parameter PDCCH-DMRS-Scrambling-ID is not configured for the CORESET, or
• a size of the DCI format corresponding to the first PDCCH candidate is identical to a size of the DCI format corresponding to the second PDCCH candidate, considering that
• the PDCCH accompanied with the DCI format is transmitted only in the first PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
• the PDCCH accompanied with the DCI format is transmitted only in the second PDCCH candidate out of the first PDCCH candidate and the second PDCCH candidate,
• the PDCCH accompanied with the DCI format is transmitted or received in the second PDCCH candidate in a case that the PDCCH accompanied with the DCI format is received in the first PDCCH candidate,
• the PDCCH accompanied with the DCI format is transmitted or received in the first PDCCH candidate in a case that the PDCCH accompanied with the DCI format is received in the second PDCCH candidate,
• the PDCCH accompanied with the DCI format is transmitted only in the PDCCH candidate having the aggregation level of 8,
• the PDCCH accompanied with the DCI format is transmitted only in the PDCCH candidate having the aggregation level of 16,
• the PDCCH accompanied with the DCI format is transmitted or received in the PDCCH candidate having the aggregation level of 16 in a case that the PDCCH accompanied with the DCI format is detected in the PDCCH candidate having the aggregation level of 8, or
• the PDCCH accompanied with the DCI format is transmitted or received in the PDCCH candidate having the aggregation level of 8 in a case that the PDCCH accompanied with the DCI format is detected in the PDCCH candidate having the aggregation level of 16.