When TRS is set as the RS of QCL type A, the TRS is different from DMRS of the PDCCH or the PDSCH, and it is assumed that the same TRS is periodically transmitted for a long time. UE may measure the TRS and calculate an average delay, a delay spread, and the like. The UE for which the TRS is configured as the RS of QCL type A in the TCI state of the DMRS of the PDCCH or the PDSCH can assume that parameters (an average delay, a delay spread, and the like) of QCL type A are the same between the DMRS of the PDCCH or the PDSCH and the TRS, and thus, can obtain the parameters (an average delay, a delay spread, and the like) of QCL type A of the DMRS of the PDCCH or the PDSCH from the measurement result of the TRS. When performing channel estimation of at least one of the PDCCH and the PDSCH, the UE can perform channel estimation with higher accuracy using the measurement result of the TRS.

UE for which RS of QCL type D has been configured can determine a UE reception beam (spatial domain reception filter, UE spatial domain reception filter) using the RS of QCL type D and determine a monitoring occasion (type 0-PDCCH monitoring occasion) of search space zero of CORESET zero.

A TCI state for at least one of PDCCH and PDSCH may indicate RS and a serving cell of UE for which the RS is configured. Only when a QCL type has been set to type C or type D, the RS may be located in a serving cell other than a cell in which the TCI state has been configured. Therefore, in carrier aggregation (CA), RS of QCL type A configured as a TCI state of a secondary cell (SCell) may be TRS of the SCell. The TRS may be transmitted in the SCell to configure the RS of QCL Type A in at least one TCI state of the PDCCH and the PDSCH in the SCell for the UE.

For DMRS of PDCCH, UE may expect that a TCI state indicates any one of the following QCL types: