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1. WO2020210767 - BEAM PREFERENCE FEEDBACK FOR DATA TRANSMISSIONS

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[ EN ]

CLAIMS

What is claimed is:

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

means for performing a measurement of one or more reference signals from a base station;

means for transmitting to the base station an indication of a beam preference for communicating with the base station based at least in part on the measurement of the one or more reference signals;

means for receiving, based at least in part on the indication of the beam preference, downlink control information from the base station, the downlink control information comprising an indication of a beam for a data transmission; and

means for communicating the data transmission using the indicated beam.

2. The apparatus of claim 2, further comprising:

means for receiving a first semi-static configuration message indicating a set of active beams; and

means for identifying the beam preference based at least in part on the set of active beams, wherein transmitting the indication of the beam preference is based at least in part on the identifying

3. The apparatus of claim 2, further comprising:

means for determining a mobility status of the UE; and

means for determining the beam preference based at least in part on the mobility status.

4. The apparatus of claim 1, further comprising:

means for receiving, from the base station, an indication of an association between one or more beam preferences and one or more mobility statuses of the UE;

means for determining a current mobility status of the UE;

means for determining the current mobility status of the UE exceeds a mobility status associated with the indicated beam;

means for transmitting, to the base station, an indication of a beam preference for communicating with the base station, the indication of beam preference associated with the current mobility status of the UE.

5. An apparatus for wireless communications at a base station, comprising:

means for transmitting, to a user equipment (UE), one or more reference signals;

means for receiving, from the UE, an indication of a beam preference for communicating with the base station based at least in part on the one or more reference signals;

means for transmitting, based at least in part on the indication of the beam preference, downlink control information to the UE, the downlink control information comprising an indication of a beam for a data transmission; and

means for communicating the data transmission using the indicated beam.

6. A method for wireless communications at a user equipment (UE), comprising:

performing a measurement of one or more reference signals from a base station;

transmitting to the base station an indication of a beam preference for communicating with the base station based at least in part on the measurement of the one or more reference signals;

receiving, based at least in part on the indication of the beam preference, downlink control information from the base station, the downlink control information comprising an indication of a beam for a data transmission; and

communicating the data transmission using the indicated beam.

7. The method of claim 6, further comprising:

receiving a first semi-static configuration message indicating a set of active beams; and

identifying the beam preference based at least in part on the set of active beams, wherein transmitting the indication of the beam preference is based at least in part on the identifying.

8. The method of claim 7, wherein the indication of the beam preference comprises a subset of the set of active beams.

9. The method of claim 7, wherein the indication of the beam preference comprises one or more candidate beams not included within the set of active beams.

10. The method of claim 7, further comprising:

receiving, based at least in part on the indication of the beam preference, a second semi-static configuration message indicating an updated set of active beams from the base station, wherein the indication of the beam for the data transmission is based at least in part on the updated set of active beams.

11. The method of claim 7, wherein the indication of the beam preference comprises an indication of a candidate beam that is spatially wider than at least one active beam of the set of active beams.

12. The method of claim 6, further comprising:

generating a scheduling request message or a medium access control (MAC) control element (MAC-CE) message, wherein the indication of the beam preference is included in the generated scheduling request message or the generated MAC-CE message.

13. The method of claim 6, further comprising:

identifying, based at least in part on the measurements of the one or more reference signals, a set of one or more preferred beams, wherein the indication of the beam preference is based at least in part on the one or more preferred beams.

14. The method of claim 6, further comprising:

identifying, based at least in part on the measurements of the one or more reference signals, a set of one or more non-preferred beams, wherein the indication of the beam preference is based at least in part on the one or more non-preferred beams.

15. The method of claim 6, further comprising:

determining a mobility status of the UE; and

determining the beam preference based at least in part on the mobility status.

16. The method of claim 6, further comprising:

determining associations between one or more beam preferences and one or more mobility statuses of the UE based at least in part on the measurement of the one or more reference signals.

17. The method of claim 16, further comprising:

determining a current mobility status of the UE;

determining the current mobility status of the UE exceeds a mobility status associated with the indicated beam;

transmitting, to the base station, an indication of a beam preference for communicating with the base station, the indication of beam preference associated with the current mobility status of the UE.

18. The method of claim 6, wherein transmitting the indication of beam preference comprises:

transmitting, to the base station, an indication of a preferred transmission configuration indication (TCI) state for receiving downlink transmissions from the base station.

19. The method of claim 6, wherein transmitting the indication of beam preference comprises:

transmitting, to the base station, an indication of a preferred spatial relation for transmitting uplink transmissions to the base station.

20. A method for wireless communications at a base station, comprising: transmitting, to a user equipment (UE), one or more reference signals;

receiving, from the UE, an indication of a beam preference for communicating with the base station based at least in part on the one or more reference signals;

transmitting, based at least in part on the indication of the beam preference, downlink control information to the UE, the downlink control information comprising an indication of a beam for a data transmission; and

communicating the data transmission using the indicated beam.

21. The method of claim 20, further comprising:

transmitting a first semi-static configuration message indicating a set of active beams, wherein the indication of the beam preference is based at least in part on the set of active beams.

22. The method of claim 21, wherein the indication of the beam preference comprises a subset of the set of active beams.

23. The method of claim 21, wherein the indication of the beam preference comprises one or more candidate beams not included within the set of active beams.

24. The method of claim 21, further comprising:

transmitting, based at least in part on the indication of the beam preference, a second semi-static configuration message indicating an updated set of active beams from the base station, wherein the indication of the beam for the data transmission is based at least in part on the updated set of active beams.

25. The method of claim 21, wherein the indication of the beam preference comprises an indication of a candidate beam that is spatially wider than at least one of the set of active beams.

26. The method of claim 20, further comprising:

receiving a scheduling request message or a medium access control (MAC) control element (MAC-CE) message, wherein the indication of the beam preference is included in the generated scheduling request message or the generated MAC-CE message.

27. The method of claim 20, wherein the indication of the beam preference comprises at least one of a preferred beam or a non-preferred beam.

28. The method of claim 20, wherein receiving the indication of the beam preference comprises:

receiving an indication of a preferred transmission configuration indication (TCI) state for transmitting downlink transmissions to the UE.

29. The method of claim 20, wherein receiving the indication of the beam preference comprises:

receiving an indication of a preferred spatial relation for receiving uplink transmissions from the UE.

30. The method of claim 20, further comprising:

associating one or more beam preferences with one or more mobility statuses of the UE based at least in part on the indication of the beam preference; and

transmitting, to the UE, an indication of the association between the one or more beam preferences and the one or more mobility statuses.