Method and apparatus for transmitting and receiving PDCCH in wireless communication system

A terminal for receiving a physical downlink control channel (PDCCH) in a wireless communication system, the terminal comprising:

• at least one transceiver for transmitting and receiving a radio signal;
• and
• at least one processor for controlling the at least one transceiver,
• wherein the at least one processor is configured to:
• receive, from a base station, configuration information related to a control resource set (CORESET), wherein the configuration information includes a plurality of transmission configuration indicator (TCI) state candidates, and each of the plurality of TCI state candidates includes information for configuring a quasi co-location (QCL) relationship between one or more reference signals and one or more antenna ports of a demodulation reference signal (DMRS) of a PDCCH;
• receive, from the base station, a single medium access control (MAC) control element (CE) for indicating two TCI states of the CORESET among the plurality of TCI state candidates;
• and
• receive, from the base station, a first PDCCH in the CORESET,
• wherein, based on the two TCI states being activated for the CORESET by the single MAC CE, one or more antenna ports of a DMRS of the first PDCCH in the CORESET are quasi co-located (QCLed) with reference signals of the two TCI states, and
• wherein the single MAC CE includes i) a CORESET identifier (ID) field, ii) a first TCI state ID field indicating one of the two TCI states applicable to the CORESET identified by the CORESET ID field and iii) a second TCI state ID field indicating the other of the two TCI states applicable to the CORESET identified by the CORESET ID field.

A method of transmitting a physical downlink control channel (PDCCH) in a wireless communication system, the method performed by a base station comprising:

• transmitting, to a terminal, configuration information related to a control resource set (CORESET), wherein the configuration information includes a plurality of transmission configuration indicator (TCI) state candidates, and each of the plurality of TCI state candidates includes information for configuring a quasi co-location (QCL) relationship between one or more reference signals and one or more antenna ports of a demodulation reference signal (DMRS) of a PDCCH;
• transmitting, to the terminal, a single medium access control (MAC) control element (CE) for indicating two TCI states of the CORESET among the plurality of TCI state candidates;
• and
• transmitting, to the terminal, a first PDCCH in the CORESET,
• wherein, based on the two TCI states being activated for the CORESET by the single MAC CE, one or more antenna ports of a DMRS of the first PDCCH in the CORESET are quasi co-located (QCLed) with reference signals of the two TCI states, and
• wherein the single MAC CE includes i) a CORESET identifier (ID) field, ii) a first TCI state ID field indicating one of the two TCI states applicable to the CORESET identified by the CORESET ID field and iii) a second TCI state ID field indicating the other of the two TCI states applicable to the CORESET identified by the CORESET ID field.