Transmitting beam schedules to and receiving beam schedules from sidelink user equipments
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first sidelink user equipment (UE) may transmit, to a second sidelink UE via sidelink control information (SCI), a receiving (Rx) beam schedule indicating Rx beams associated with the first sidelink UE in a set of slots, wherein the Rx beam schedule indicates that the first sidelink UE is configured to tune to the Rx beams in the set of slots for possible sidelink receptions. The first sidelink UE may receive, from the second sidelink UE, a sidelink transmission using an Rx beam indicated in the Rx beam schedule. Numerous other aspects are described.
1. An apparatus for wireless communication at a first sidelink user equipment (UE), comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
transmit, to a second sidelink UE via sidelink control information (SCI), a receiving (Rx) beam schedule indicating Rx beams associated with the first sidelink UE in a set of slots,
wherein the Rx beam schedule indicates that the first sidelink UE is configured to tune to the Rx beams in the set of slots for sidelink receptions, and
wherein the Rx beam schedule is:
a dynamic Rx beam schedule carried in the SCI based at least in part on a dynamic reservation field being configured in a physical sidelink control channel (PSCCH), or
a periodic Rx beam schedule carried in the SCI based at least in part on a periodic reservation field being configured in the PSCCH; and
receive, from the second sidelink UE, a sidelink transmission using an Rx beam indicated in the Rx beam schedule.
2. The apparatus of claim 1 , wherein the one or more processors, to receive the sidelink transmission using the Rx beam, are configured to receive the sidelink transmission without a unicast connection setup between the first sidelink UE and the second sidelink UE, or prior to the unicast connection setup between the first sidelink UE and the second sidelink UE.
3. The apparatus of claim 1 , wherein the one or more processors, to transmit the Rx beam schedule, are configured to:
transmit the Rx beam schedule in a unicast PSCCH or physical sidelink shared channel (PSSCH);
transmit the Rx beam schedule in a groupcast PSCCH or PSSCH;
transmit the Rx beam schedule in a broadcast PSCCH or PSSCH;
transmit the Rx beam schedule in a medium access control control element (MAC-CE); or
transmit the Rx beam schedule in an application layer packet in the groupcast PSCCH or PSSCH, or in the broadcast PSCCH or PSSCH.
4. The apparatus of claim 1 , wherein the Rx beam indicated in the Rx beam schedule corresponds to a transmit (Tx) beam used for transmitting a current PSCCH or physical sidelink shared channel (PSSCH), or
wherein the Rx beam schedule indicates other Rx beams not corresponding to the Tx beam.
5. The apparatus of claim 1 , wherein the dynamic Rx beam schedule indicates the set of slots in a time window.
6. The apparatus of claim 1 , wherein the periodic Rx beam schedule indicates that the first sidelink UE is configured to tune to the Rx beams in the set of slots defined with a periodicity in a time window.
7. The apparatus of claim 1 , wherein the periodic Rx beam schedule indicates that the first sidelink UE is configured to perform a beam sweeping reception at a start of the set of slots defined with a periodicity in a time window.
8. The apparatus of claim 1 , wherein the periodic Rx beam schedule indicates a start of a next periodic Rx beam schedule, wherein the start of the next periodic Rx beam schedule corresponds to a time window of upcoming slots during which the first sidelink UE transmits the next periodic Rx beam schedule.
9. The apparatus of claim 1 , wherein the one or more processors are further configured to:
receive the Rx beam schedule from a network entity; and
wherein transmitting the Rx beam schedule to the second sidelink UE comprises transmitting the Rx beam schedule received from the network entity.
10. The apparatus of claim 1 , wherein the one or more processors are further configured to:
receive an initial Rx beam schedule from a network entity; and
wherein transmitting the Rx beam schedule to the second sidelink UE comprises transmitting the Rx beam schedule based at least in part on the initial Rx beam schedule received from the network entity.
11. An apparatus for wireless communication at a second sidelink user equipment (UE), comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive, from a first sidelink UE via sidelink control information (SCI), a receiving (Rx) beam schedule indicating Rx beams associated with the first sidelink UE in a set of slots,
wherein the Rx beam schedule is:
a dynamic Rx beam schedule carried in the SCI based at least in part on a dynamic reservation field being configured in a physical sidelink control channel (PSCCH), or
a periodic Rx beam schedule carried in the SCI based at least in part on a periodic reservation field being configured in the PSCCH; and
transmit, to the first sidelink UE, a sidelink transmission using an Rx beam indicated in the Rx beam schedule.
12. The apparatus of claim 11 , wherein the one or more processors are further configured to:
receive a plurality of Rx beam schedules from a plurality of sidelink UEs; and
transmit, based at least in part on an occurrence of a triggering condition, a medium access control control element (MAC-CE) associated with the plurality of Rx beam schedules,
wherein the triggering condition is based at least in part on:
a signal received from a peer sidelink UE having a unicast connection with the second sidelink UE,
a signal from a network entity, or
a periodic timer.
13. The apparatus of claim 11 , wherein the one or more processors, to transmit the sidelink transmission using the Rx beam, are configured to transmit the sidelink transmission without a unicast connection setup between the second sidelink UE and the first sidelink UE, or prior to the unicast connection setup between the second sidelink UE and the first sidelink UE.
14. The apparatus of claim 11 , wherein the dynamic Rx beam schedule indicates the set of slots in a time window.
15. The apparatus of claim 11 , wherein the periodic Rx beam schedule indicates that the first sidelink UE is configured to tune to the Rx beams in the set of slots defined with a periodicity in a time window.
16. A method of wireless communication performed by a first sidelink user equipment (UE), comprising:
transmitting, to a second sidelink UE via sidelink control information (SCI), a receiving (Rx) beam schedule indicating Rx beams associated with the first sidelink UE in a set of slots,
wherein the Rx beam schedule indicates that the first sidelink UE is configured to tune to the Rx beams in the set of slots for sidelink receptions, and
wherein the Rx beam schedule is:
a dynamic Rx beam schedule carried in the SCI based at least in part on a dynamic reservation field being configured in a physical sidelink control channel (PSCCH), or
a periodic Rx beam schedule carried in the SCI based at least in part on a periodic reservation field being configured in the PSCCH; and
receiving, from the second sidelink UE, a sidelink transmission using an Rx beam indicated in the Rx beam schedule.
17. The method of claim 16 , wherein receiving the sidelink transmission using the Rx beam comprises receiving the sidelink transmission without a unicast connection setup between the first sidelink UE and the second sidelink UE, or prior to the unicast connection setup between the first sidelink UE and the second sidelink UE.
18. The method of claim 16 , wherein transmitting the Rx beam schedule comprises:
transmitting the Rx beam schedule in a unicast PSCCH or physical sidelink shared channel (PSSCH);
transmitting the Rx beam schedule in a groupcast PSCCH or PSSCH;
transmitting the Rx beam schedule in a broadcast PSCCH or PSSCH;
transmitting the Rx beam schedule in a medium access control control element (MAC-CE); or
transmitting the Rx beam schedule in an application layer packet in the groupcast PSCCH or PSSCH, or in the broadcast PSCCH or PSSCH.
19. The method of claim 16 , wherein the Rx beam indicated in the Rx beam schedule corresponds to a transmit (Tx) beam used for transmitting a current PSCCH or physical sidelink shared channel (PSSCH), or
wherein the Rx beam schedule indicates other Rx beams not corresponding to the Tx beam.
20. The method of claim 16 , wherein the dynamic Rx beam schedule indicates the set of slots in a time window.
21. The method of claim 16 , wherein the periodic Rx beam schedule indicates the first sidelink UE is configured to tune to the Rx beams in the set of slots defined with a periodicity in a time window.
22. The method of claim 16 , wherein the periodic Rx beam schedule indicates that the first sidelink UE is configured to perform a beam sweeping reception at a start of the set of slots defined with a periodicity in a time window.
23. The method of claim 16 , wherein the periodic Rx beam schedule indicates a start of a next periodic Rx beam schedule.
24. The method of claim 16 , further comprising:
receiving the Rx beam schedule from a network entity; and
wherein transmitting the Rx beam schedule to the second sidelink UE comprises transmitting the Rx beam schedule received from the network entity.
25. The method of claim 16 , further comprising:
receiving an initial Rx beam schedule from a network entity; and
wherein transmitting the Rx beam schedule to the second sidelink UE comprises transmitting the Rx beam schedule based at least in part on the initial Rx beam schedule received from the network entity.
26. A method of wireless communication performed by a second sidelink user equipment (UE), comprising:
receiving, from a first sidelink UE via sidelink control information (SCI), a receiving (Rx) beam schedule indicating Rx beams associated with the first sidelink UE in a set of slots,
wherein the Rx beam schedule is:
a dynamic Rx beam schedule carried in the SCI based at least in part on a dynamic reservation field being configured in a physical sidelink control channel (PSCCH), or
a periodic Rx beam schedule carried in the SCI based at least in part on a periodic reservation field being configured in the PSCCH; and
transmitting, to the first sidelink UE, a sidelink transmission using an Rx beam indicated in the Rx beam schedule.
27. The method of claim 26 , further comprising:
receiving a plurality of Rx beam schedules from a plurality of sidelink UEs; and
transmitting, based at least in part on an occurrence of a triggering condition, a medium access control control element (MAC-CE) associated with the plurality of Rx beam schedules,
wherein the triggering condition is based at least in part on:
a signal received from a peer sidelink UE having a unicast connection with the second sidelink UE,
a signal from a network entity, or
a periodic timer.
28. The method of claim 26 , wherein transmitting the sidelink transmission using the Rx beam comprises transmitting the sidelink transmission without a unicast connection setup between the second sidelink UE and the first sidelink UE, or prior to the unicast connection setup between the second sidelink UE and the first sidelink UE.
29. The method of claim 26 , wherein the dynamic Rx beam schedule indicates the set of slots in a time window.
30. The method of claim 26 , wherein the periodic Rx beam schedule indicates the first sidelink UE is configured to tune to the Rx beams in the set of slots defined with a periodicity in a time window.