Method and apparatus for performing cooperative communication in wireless communication system

A method of a base station (BS) in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE), radio resource control (RRC) information configuring a plurality of transmission configuration indication (TCI) states for a physical downlink shared channel (PDSCH);
• transmitting, to the UE, a medium access control (MAC) control element (CE) activating a plurality of TCI state groups, wherein each TCI state group of the plurality of TCI state groups includes a TCI state or a combination of two TCI states, based on the RRC information;
• and
• transmitting, to the UE, downlink control information (DCI) including a codepoint of a TCI field,
• wherein the codepoint of the TCI field indicates a TCI state group from among the plurality of TCI states groups.

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

• at least one processor operably connected to the memory and the transceiver, the at least one processor configured to:
• control the transceiver to receive, from a base station (BS), radio resource control (RRC) information configuring a plurality of transmission configuration indication (TCI) states for a physical downlink shared channel (PDSCH),
• control the transceiver to receive, from the base station, a medium access control (MAC) control element (CE) activating a plurality of TCI state groups, wherein each TCI state group of the plurality of TCI state groups includes a TCI state or a combination of two TCI states, based on the RRC information, and
• control the transceiver to receive, from the base station, downlink control information (DCI) including a codepoint of a TCI field,
• wherein the codepoint of the TCI field indicates a TCI state group from among the plurality of TCI states groups.

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

• a transceiver;
• and
• at least one processor operably connected to the transceiver, the at least one processor configured to:
• control the transceiver to transmit, to a user equipment (UE), radio resource control (RRC) information configuring a plurality of transmission configuration indication (TCI) states for a physical downlink shared channel (PDSCH),
• control the transceiver to transmit, to the UE, a medium access control (MAC) control element (CE) a plurality of TCI state groups, wherein each TCI state group of the plurality of TCI state groups includes a TCI state or a combination of two TCI states, based on the RRC information, and
• control the transceiver to transmit, to the UE, downlink control information (DCI) including a codepoint of a TCI field,
• wherein the codepoint of the TCI field indicates a TCI state group from among the plurality of TCI state groups.