Signaling to assist waveform selection

1. A method for wireless communications by a user equipment (UE), comprising:

transmitting, to a network device, feedback information that indicates delay spread information;

receiving control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

communicating the first data transmission via the first beam using the first waveform.

2. The method of claim 1 , wherein receiving the control signaling comprises:

receiving the control signaling that indicates to use a second waveform of the plurality of different waveforms for a second data transmission via a second beam based at least in part on the feedback information, the first waveform being different than the second waveform.

3. The method of claim 2 , wherein communicating the first data transmission via the first beam comprises receiving the first data transmission from the network device using the first waveform, the method further comprising:

communicating the second data transmission via the second beam using the second waveform, wherein communicating the second data transmission via the second beam comprises receiving the second data transmission from the network device using the second waveform.

4. The method of claim 1 , wherein transmitting the feedback information comprises:

transmitting the feedback information that indicates a power amplifier capability.

5. The method of claim 1 , wherein transmitting the feedback information comprises:

transmitting the feedback information that indicates a waveform recommendation.

6. The method of claim 5 , wherein the control signaling indicating the first waveform follows or disregards the waveform recommendation.

7. The method of claim 1 , wherein receiving the control signaling comprises:

receiving downlink control information, radio resource control signaling, a medium access control (MAC) control element (CE), or any combination thereof, that indicates to use the first waveform of the plurality of different waveforms.

8. The method of claim 1 , wherein transmitting the feedback information comprises:

transmitting the feedback information that indicates the delay spread information that comprises a delay spread threshold for a bandwidth assignment, or a modulation and coding scheme, or a signal-to-noise ratio, or a signal-to-interference-plus-noise ratio, or any combination thereof, for selecting between the first waveform and a second waveform.

9. The method of claim 1 , wherein transmitting the feedback information comprises:

transmitting the feedback information that indicates the delay spread information that comprises a delay spread measurement, wherein the control signaling that indicates to use the first waveform is based at least in part on the delay spread measurement.

10. The method of claim 1 , further comprising:

receiving a feedback request from the network device, wherein the feedback information is transmitted based at least in part on the feedback request.

11. The method of claim 10 , wherein receiving the feedback request comprises:

receiving downlink control information that instructs the UE to transmit the feedback information.

12. The method of claim 10 , wherein receiving the feedback request comprises:

receiving radio resource control signaling that indicates a configuration of a reference signal report, wherein the feedback information is the reference signal report.

13. The method of claim 12 , wherein the configuration of the reference signal report is a configuration of a channel state information reference signal report.

14. The method of claim 10 , wherein receiving the feedback request comprises:

receiving a message that activates a configuration of a reference signal report for delay spread reporting, wherein the feedback information is the reference signal report.

15. The method of claim 1 , wherein transmitting the feedback information comprises:

transmitting first feedback information corresponding to the first beam and second feedback information corresponding to a second beam.

16. The method of claim 15 , wherein each of the first feedback information and the second feedback information indicates a respective transmission configuration indicator (TCI) state.

17. The method of claim 1 , wherein, in response to the indication of delay spread information comprising a first delay spread measurement, the first waveform is an orthogonal frequency division multiplexing waveform, or in response to the indication of delay spread information comprising a second delay spread measurement which is less than the first delay spread measurement, the first waveform is a single carrier frequency division multiplexing waveform.

18. A method for wireless communications by a network device, comprising:

receiving, from a user equipment (UE), feedback information that indicates delay spread information;

transmitting, to the UE, control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

communicating the first data transmission via the first beam using the first waveform.

19. The method of claim 18 , wherein transmitting the control signaling comprises:

transmitting, to the UE, the control signaling that indicates to use a second waveform of the plurality of different waveforms for a second data transmission via a second beam based at least in part on the feedback information, the first waveform being different than the second waveform.

20. The method of claim 19 , wherein communicating the first data transmission via the first beam comprises receiving the first data transmission from the network device using the first waveform, the method further comprising:

communicating the second data transmission via the second beam using the second waveform, wherein communicating the second data transmission via the second beam comprises receiving the second data transmission from the network device using the second waveform.

21. The method of claim 18 , wherein receiving the feedback information comprises:

receiving the feedback information that indicates a power amplifier capability.

22. The method of claim 18 , wherein receiving the feedback information comprises:

receiving the feedback information that indicates a waveform recommendation.

23. The method of claim 22 , wherein the control signaling indicating the first waveform follows or disregards the waveform recommendation.

24. The method of claim 18 , wherein transmitting the control signaling comprises:

transmitting downlink control information, radio resource control signaling, a medium access control (MAC) control element (CE), or any combination thereof, that indicates to use the first waveform of the plurality of different waveforms.

25. The method of claim 18 , wherein receiving the feedback information comprises:

receiving the feedback information that indicates the delay spread information that comprises a delay spread threshold for a bandwidth assignment, or a modulation and coding scheme, or a signal-to-noise ratio, or a signal-to-interference-plus-noise ratio, or any combination thereof, for selecting between the first waveform and a second waveform.

26. The method of claim 18 , wherein receiving the feedback information comprises:

receiving the feedback information that indicates the delay spread information that comprises a delay spread measurement, wherein the control signaling that indicates to use the first waveform is based at least in part on the delay spread measurement.

27. The method of claim 18 , further comprising:

transmitting a feedback request to the UE, wherein the feedback information is received based at least in part on the feedback request.

28. The method of claim 27 , wherein transmitting the feedback request comprises:

transmitting downlink control information that instructs the UE to transmit the feedback information.

29. The method of claim 27 , wherein transmitting the feedback request comprises:

transmitting radio resource control signaling that indicates a configuration of a reference signal report, wherein the feedback information is the reference signal report.

30. The method of claim 29 , wherein the configuration of the reference signal report is a configuration of a channel state information reference signal report.

31. The method of claim 27 , wherein transmitting the feedback request comprises:

transmitting a message that activates a configuration of a reference signal report for delay spread reporting, wherein the feedback information is the reference signal report.

32. The method of claim 18 , wherein receiving the feedback information comprises:

receiving first feedback information corresponding to the first beam and second feedback information corresponding to a second beam.

33. The method of claim 32 , wherein each of the first feedback information and the second feedback information indicates a respective transmission configuration indicator (TCI) state.

34. The method of claim 18 , wherein, in response to the indication of delay spread information comprising a first delay spread measurement, the first waveform is an orthogonal frequency division multiplexing waveform, or in response to the indication of delay spread information comprising a second delay spread measurement which is less than the first delay spread measurement, the first waveform is a single carrier frequency division multiplexing waveform.

35. An apparatus for wireless communications by 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:

transmit, to a network device, feedback information that indicates delay spread information;

receive control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

communicate the first data transmission via the first beam using the first waveform.

36. An apparatus for wireless communications by a network device, 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, from a user equipment (UE), feedback information that indicates delay spread information;

transmit, to the UE, control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

communicate the first data transmission via the first beam using the first waveform.

37. An apparatus for wireless communications by a user equipment (UE), comprising:

means for transmitting, to a network device, feedback information that indicates delay spread information;

means for receiving control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

means for communicating the first data transmission via the first beam using the first waveform.

38. An apparatus for wireless communications by a network device, comprising:

means for receiving, from a user equipment (UE), feedback information that indicates delay spread information;

means for transmitting, to the UE, control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

means for communicating the first data transmission via the first beam using the first waveform.

39. A non-transitory computer-readable medium storing code for wireless communications by a user equipment (UE), the code comprising instructions executable by a processor to:

transmit, to a network device, feedback information that indicates delay spread information;

receive control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

communicate the first data transmission via the first beam using the first waveform.

40. A non-transitory computer-readable medium storing code for wireless communications by a network device, the code comprising instructions executable by a processor to:

receive, from a user equipment (UE), feedback information that indicates delay spread information;

transmit, to the UE, control signaling that indicates to use a first waveform of a plurality of different waveforms for a first data transmission via a first beam based at least in part on the feedback information; and

communicate the first data transmission via the first beam using the first waveform.