Method of configuring and indicating beam information for M-TRP communication in wireless communication system

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

• transmitting, to a user equipment (UE), via a first transmission reception point, TRP, a configuration information for a plurality of transmission configuration indicator (TCI) state including a common TCI state for a control resource set (CORESET), and physical downlink shared channel, PDSCH, for the first TRP, and a TCI state for a PDSCH for a second TRP;
• transmitting, to the UE via the first TRP, a first downlink control information (DCI), via a physical downlink control channel (PDCCH), the first DCI including information indicating a first TCI state for the first TRP and a second TCI state for the second TRP;
• receiving, from the UE via the first TRP, a first acknowledgement (ACK) indicating successful reception and of the first TCI state and the second TCI state;
• transmitting, to the UE via the first TRP, a second DCI based on the first TCI state via the PDCCH, the second DCI including information indicating a third TCI state for the first TRP and a fourth TCI state for the second TRP;
• and
• transmitting, to the UE via the second TRP, the PDSCH based on the fourth TCI state without receiving a second ACK indicating successful reception of the third TCI state and the fourth TCI state from the first TRP.

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

• at least one transceiver;
• at least one processor communicatively coupled to the at least one transceiver;
• and
• at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the UE to:
• receive, from a first transmission reception point, TRP, a configuration information for a plurality of transmission configuration indicator (TCI) state including a common TCI state for a control resource set (CORESET), and physical downlink shared channel, PDSCH, for the first TRP, and a TCI state for a PDSCH for a second TRP,
• receive, from the first TRP, a first downlink control information (DCI), via a physical downlink control channel (PDCCH), the first DCI including information indicating a first TCI state for the first TRP and a second TCI state for the second TRP,
• transmit, to the first TRP, a first acknowledgement (ACK) indicating successful reception of the first TCI state and the second TCI state,
• receive, from the first TRP, a second DCI based on the first TCI state via the PDCCH, the second DCI including information indicating a third TCI state for the first TRP and a fourth TCI state for the second TRP, and
• receive, from the second TRP, the PDSCH based on the fourth TCI state without transmitting a second ACK indicating successful reception of the third TCI state and the fourth TCI state to the first TRP.

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

• at least one transceiver;
• at least one processor communicatively coupled to the at least one transceiver;
• and
• at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the base station to:
• transmit, to a user equipment (UE), via a first transmission reception point, TRP, a configuration information for a plurality of transmission configuration indicator (TCI) state including a common TCI state for a control resource set (CORESET), and physical downlink shared channel, PDSCH, for the first TRP, and a TCI state for a PDSCH for a second TRP,
• transmit, to the UE via the first TRP, a first downlink control information (DCI), via a physical downlink control channel (PDCCH), the first DCI including information indicating a first TCI state for the first TRP and a second TCI state for the second TRP,
• receive, from the UE via the first TRP, a first acknowledgement (ACK) indicating successful reception of the first TCI state and the second TCI state,
• transmit, to the UE via the first TRP, a second DCI based on the first TCI state via the PDCCH, the second DCI including information indicating a third TCI state for the first TRP and a fourth TCI state for the second TRP, and
• transmit, to the UE via the second TRP, the PDSCH based on the fourth TCI state without receiving a second ACK indicating successful reception of the third TCI state and the fourth TCI state from the first TRP.