Rach conveyance of DL synchronization beam information for various DL-UL correspondence states

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

• transmitting a downlink (DL) signal on one or more DL beams;
• receiving an indication of a nature of beam correspondence between the one or more DL beams at a user equipment (UE) and one or more uplink (UL) beams at the UE, wherein the nature of beam correspondence corresponds to one of:
• full beam correspondence, partial beam correspondence, or no beam correspondence;
• receiving, on at least one of a resource or a waveform, a scheduling request message from the UE;
• identifying, based at least in part on the resource or the waveform and further based at least in part on the nature of beam correspondence, a selected DL beam of the one or more DL beams for communications from the base station to the UE, the selected DL beam associated with one or more uplink beams at the base station by beam correspondence;
• and
• transmitting one or more subsequent messages to the UE using the selected DL beam.

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

• a processor, memory coupled with the processor;
• and instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive a downlink (DL) signal from a base station on one or more DL beams;
• select a DL beam of the one or more DL beams for communications from the base station to the UE;
• transmit an indication of a nature of beam correspondence between the one or more DL beams at the UE and one or more uplink (UL) beams at the UE, wherein the nature of beam correspondence corresponds to one of:
• full beam correspondence, partial beam correspondence, or no beam correspondence;
• select a resource or a waveform for uplink transmission, the resource or the waveform corresponding to the selected DL beam of the one or more DL beams and selected based at least in part on the beam correspondence between the selected DL beam and one or more uplink beams at the UE;
• and
• transmit a scheduling request message to the base station using at least one of the resource or the waveform selected based at least in part on the selected DL beam.

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

• a processor, memory coupled with the processor;
• and instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit a downlink (DL) signal on one or more DL beams;
• receive an indication of a nature of beam correspondence between the one or more DL beams at a user equipment (UE) and one or more uplink (UL) beams at the UE, wherein the nature of beam correspondence corresponds to one of:
• full beam correspondence, partial beam correspondence, or no beam correspondence;
• receive, on at least one of a resource or a waveform, a scheduling request message from the UE;
• identify, based at least in part on the resource or the waveform and further based at least in part on the nature of beam correspondence, a selected DL beam of the one or more DL beams for communications from the base station to the UE, the selected DL beam associated with one or more uplink beams at the base station by beam correspondence;
• and
• transmit one or more subsequent messages to the UE using the selected DL beam.