Methods and apparatus to facilitate spatial relation indication for uplink control channel and sounding reference signals

An apparatus for wireless communication at a first user equipment (UE), comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• determine, based on a rule, a default uplink transmit beam for transmitting an uplink transmission when an uplink transmit beam for the uplink transmission is not configured, wherein the default uplink transmit beam corresponds to a beam used for receiving a downlink transmission, wherein parameters for the default uplink transmit beam correspond to the beam, and wherein the determining of the default uplink transmit beam includes selecting a beam associated with a control resource set (CORESET) having a lowest CORESET identifier;
• and
• transmit, to a base station, the uplink transmission on the default uplink transmit beam.

A method of wireless communication at a base station, comprising:

• transmitting, to a user equipment (UE), a downlink transmission on a downlink beam;
• selecting a beam to monitor for receiving an uplink transmission, wherein parameters of the selected beam correspond to the downlink beam, and wherein the selecting of the beam to monitor for receiving the uplink transmission is based on the beam associated with a control resource set (CORESET) having a lowest CORESET identifier;
• and
• receiving, from the UE, the uplink transmission on a default uplink transmit beam when the base station has not configured an uplink transmit beam for the uplink transmission.

An apparatus for wireless communication at a base station, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• transmit, to a user equipment (UE), a downlink transmission on a downlink beam;
• select a beam to monitor for receiving an uplink transmission, wherein parameters of the selected beam correspond to the downlink beam, and wherein the selecting of the beam to monitor for receiving the uplink transmission is based on the beam associated with a control resource set (CORESET) having a lowest CORESET identifier;
• and
• receive, from the UE, the uplink transmission on a default uplink transmit beam when the base station has not configured an uplink transmit beam for the uplink transmission.