Method and apparatus for transmitting and receiving signal by using multiple beams in wireless communication system

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

• transmitting, to a user equipment (UE), physical downlink shared channel (PDSCH) configuration information including a list of transmission configuration indicator (TCI) states;
• transmitting, to the UE, a PDSCH media access control element (MAC CE) including information indicating an activation of at least one TCI state in the list of TCI states, the PDSCH MAC CE being capable of indicating two or more TCI states for one TCI codepoint, the PDSCH MAC CE being associated with a logical channel identifier (LCD) value;
• transmitting, to the UE, downlink control information (DCI) including information indicating a TCI codepoint;
• and
• transmitting, to the UE, data via a PDSCH based on the information indicating the activation of the at least one TCI state and the information indicating the TCI codepoint,
• wherein the information indicating the activation of the at least one TCI state comprises an identifier of a first TCI state mapped to a first TCI codepoint and an indicator indicating whether an identifier of a second TCI state mapped to the first TCI codepoint is present,
• wherein the identifier of the second TCI state is included in the information indicating the activation of the at least one TCI state in case that a value of the indicator is 1,
• wherein the identifier of the second TCI state is not included in the information indicating the activation of the at least one TCI state in case that a value of the indicator is 0, and
• wherein by the information indicating the activation of the at least one TCI state, for at least one TCI codepoint, two TCI states are indicated.

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

• a transceiver;
• and
• a processor operably connected to the transceiver, the processor configured to:
• receive, from a base station (BS), physical downlink shared channel (PDSCH) configuration information including a list of transmission configuration indicator (TCI) states,
• receive, from the BS, a PDSCH media access control element (MAC CE) including information indicating an activation of at least one TCI state in the list of TCI states, the PDSCH MAC CE being associated with a logical channel identifier (LCD) value,
• identify that the PDSCH MAC CE is a MAC CE capable of indicating two or more TCI states for one TCI codepoint based on the LCID value associated with the PDSCH MAC CE,
• receive, from the BS, downlink control information (DCI) including information indicating a TCI codepoint, and
• receive, from the BS, data via a PDSCH based on the information indicating the activation of the at least one TCI state and the information indicating the TCI codepoint,
• wherein the information indicating the activation of the at least one TCI state comprises an identifier of a first TCI state mapped to a first TCI codepoint and an indicator indicating whether an identifier of a second TCI state mapped to the first TCI codepoint is present,
• wherein the identifier of the second TCI state is included in the information indicating the activation of the at least one TCI state in case that a value of the indicator is 1,
• wherein the identifier of the second TCI state is not included in the information indicating the activation of the at least one TCI state in case that a value of the indicator is 0, and
• wherein by the information indicating the activation of the at least one TCI state, for at least one TCI codepoint, two TCI states are indicated.

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

• a transceiver;
• and
• a processor operably connected to the transceiver, the processor configured to:
• transmit, to a user equipment (UE), physical downlink shared channel (PDSCH) configuration information including a list of transmission configuration indicator (TCI) states,
• transmit, to the UE, a PDSCH media access control element (MAC CE) including information indicating an activation of at least one TCI state in the list of TCI states, the PDSCH MAC CE being capable of indicating two or more TCI states for one TCI codepoint, the PDSCH MAC CE being associated with a logical channel identifier (LCD) value,
• transmit, to the UE, downlink control information (DCI) including information indicating a TCI codepoint, and
• transmit, to the UE, data via a PDSCH based on the information indicating the activation of the at least one TCI state and the information indicating the TCI codepoint,
• wherein the information indicating the activation of the at least one TCI state comprises an identifier of a first TCI state mapped to a first TCI codepoint and an indicator indicating whether an identifier of a second TCI state mapped to the first TCI codepoint is present,
• wherein the identifier of the second TCI state is included in the information indicating the activation of the at least one TCI state in case that a value of the indicator is 1,
• wherein the identifier of the second TCI state is not included in the information indicating the activation of the at least one TCI state in case that a value of the indicator is 0, and
• wherein by the information indicating the activation of the at least one TCI state, for at least one TCI codepoint, two TCI states are indicated.