Method and apparatus for applying transmission beam of uplink control channel in wireless communication system

A base station in a wireless communication system, the base station comprising:

• at least one transceiver;
• and
• a controller coupled to the at least one transceiver,
• wherein the controller is configured to:
• transmit, to a user equipment (UE), configuration information on one or more physical uplink control channel (PUCCH) resources indicating at least one transmission configuration indicator (TCI) state and information on a TCI state application time;
• transmit, to the UE, first downlink control information (DCI) comprising information indicating first one or more TCI states;
• transmit, to the UE, second DCI which is for scheduling of a PUCCH and comprises information indicating second one or more TCI states and an indicator for at least one PUCCH resource;
• and
• receive the PUCCH from the UE based on the first DCI, the second DCI, and the TCI state application time.

A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

• receiving, from a base station, configuration information on one or more physical uplink control channel (PUCCH) resources indicating at least one transmission configuration indicator (TCI) state and information on a TCI state application time;
• receiving, from the base station, first downlink control information (DCI) comprising information indicating first one or more TCI states;
• receiving, from the base station, second DCI which is for scheduling of a PUCCH and comprises information indicating second one or more TCI states and an indicator for at least one PUCCH resource;
• and
• transmitting the PUCCH to the base station based on the first DCI, the second DCI, and the TCI state application time.