Methods and apparatuses for physical layer beam indications

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

• transmitting, to a user equipment (UE), first configuration information on at least one transmission configuration indicator (TCI) state;
• transmitting, to the UE, downlink control information (DCI) for indicating a TCI state among the at least one TCI state;
• and
• receiving, from the UE via an uplink channel, positive hybrid automatic repeat request acknowledgment (HARQ-ACK) information indicating that the DCI was successfully received,
• wherein the TCI state is applied for transmission or reception of a signal from a slot that is a time duration after a last symbol of the uplink channel carrying the positive HARQ-ACK information, and
• wherein the time duration is configured by second configuration information received from the base station.

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

• a processor;
• and
• a transceiver coupled with the processor and configured to:
• receive, from a base station, first configuration information on at least one transmission configuration indicator (TCI) state,
• receive, from the base station, downlink control information (DCI) for indicating a TCI state among the at least one TCI state, and
• transmit, to the base station via an uplink channel, positive hybrid automatic repeat request acknowledgment (HARQ-ACK) information indicating that the DCI was successfully received,
• wherein the TCI state is applied for transmission or reception of a signal from a slot that is a time duration after a last symbol of the uplink channel carrying the positive HARQ-ACK information, and
• wherein the time duration is configured by second configuration information received from the base station.

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

• a processor;
• and
• a transceiver coupled with the processor and configured to:
• transmit, to a user equipment (UE), first configuration information on at least one transmission configuration indicator (TCI) state,
• transmit, to the UE, downlink control information (DCI) for indicating a TCI state among the at least one TCI state, and
• receive, from the UE via an uplink channel, positive hybrid automatic repeat request acknowledgment (HARQ-ACK) information indicating that the DCI was successfully received,
• wherein the TCI state is applied for transmission or reception of a signal from a slot that is a time duration after a last symbol of the uplink channel carrying the positive HARQ-ACK information, and
• wherein the time duration is configured by second configuration information received from the base station.