Waveform-dependent random access channel procedure

1. A method for wireless communication at a user equipment (UE), comprising:

receiving an indication of at least one receive capability of a network access device;

transmitting a first message of a random access channel (RACH) procedure;

receiving a random access response (RAR) message in response to transmitting the first message;

interpreting the RAR message according to a format based at least in part on the received indication;

identifying, based at least in part on the indication, both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability of the network access device;

determining a type of uplink resource assignment included in the RAR message based at least in part on a second indication included in the RAR message; and

interpreting an uplink resource assignment included in the RAR message as the determined type of uplink resource assignment.

2. The method of claim 1 , further comprising:

identifying, based at least in part on the indication, only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability of the network access device; and

interpreting an uplink resource assignment included in the RAR message as a CP-OFDM waveform resource assignment.

3. The method of claim 2 , further comprising:

transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

4. The method of claim 1 , wherein the determined type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

5. The method of claim 1 , further comprising:

transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

6. The method of claim 1 , wherein the indication of the at least one receive capability of the network access device is received in system information.

7. The method of claim 6 , wherein the system information is received in at least one of: a minimum system information (MSI) received on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) received on a physical downlink shared channel (PDSCH), or a combination thereof.

8. The method of claim 1 , wherein the first message is transmitted according to a predetermined uplink resource assignment.

9. The method of claim 8 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

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

means for receiving an indication of at least one receive capability of a network access device;

means for transmitting a first message of a random access channel (RACH) procedure;

means for receiving a random access response (RAR) message in response to transmitting the first message;

means for interpreting the RAR message according to a format based at least in part on the received indication;

means for identifying, based at least in part on the indication, both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency- division multiplexing (DFT-s-OFDM) waveform receive capability of the network access device;

means for determining a type of uplink resource assignment included in the RAR message based at least in part on a second indication included in the RAR message; and

means for interpreting an uplink resource assignment included in the RAR message as the determined type of uplink resource assignment.

11. The apparatus of claim 10 , further comprising:

means for identifying, based at least in part on the indication, only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability of the network access device; and

means for interpreting an uplink resource assignment included in the RAR message as a CP-OFDM waveform resource assignment.

12. The apparatus of claim 11 , further comprising:

means for transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

13. The apparatus of claim 10 , wherein the determined type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

14. The apparatus of claim 10 , further comprising:

means for transmitting, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

15. The apparatus of claim 10 , wherein the indication of the at least one receive capability of the network access device is received in system information.

16. The apparatus of claim 15 , wherein the system information is received in at least one of: a minimum system information (MSI) received on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) received on a physical downlink shared channel (PDSCH), or a combination thereof.

17. The apparatus of claim 10 , wherein the first message is transmitted according to a predetermined uplink resource assignment.

18. The apparatus of claim 17 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

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

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to:

receive an indication of at least one receive capability of a network access device;

transmit a first message of a random access channel (RACH) procedure;

receive a random access response (RAR) message in response to transmitting the first message;

interpret the RAR message according to a format based at least in part on the received indication;

wherein the instructions are executable by the processor to:

identify, based at least in part on the indication, both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability of the network access device;

determine a type of uplink resource assignment included in the RAR message based at least in part on a second indication included in the RAR message; and

interpret an uplink resource assignment included in the RAR message as the determined type of uplink resource assignment.

20. The apparatus of claim 19 , wherein the instructions are executable by the processor to:

identify, based at least in part on the indication, only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability of the network access device; and

interpret an uplink resource assignment included in the RAR message as a CP- OFDM waveform resource assignment.

21. The apparatus of claim 20 , wherein the instructions are executable by the processor to:

transmit, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

22. The apparatus of claim 19 , wherein the determined type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

23. The apparatus of claim 19 , wherein the instructions are executable by the processor to:

transmit, based at least in part on the uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

24. The apparatus of claim 19 , wherein the indication of the at least one receive capability of the network access device is received in system information.

25. The apparatus of claim 24 , wherein the system information is received in at least one of: a minimum system information (MSI) received on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) received on a physical downlink shared channel (PDSCH), or a combination thereof.

26. The apparatus of claim 19 , wherein the first message is transmitted according to a predetermined uplink resource assignment.

27. The apparatus of claim 26 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

28. A non-transitory computer-readable medium storing computer-executable code for wireless communication at a user equipment (UE), the code executable by a processor to:

receive an indication of at least one receive capability of a network access device;

transmit a first message of a random access channel (RACH) procedure;

receive a random access response (RAR) message in response to transmitting the first message;

interpret the RAR message according to a format based at least in part on the received indication;

wherein the code is executable by the processor to:

identify, based at least in part on the indication, both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability of the network access device;

determine a type of uplink resource assignment included in the RAR message based at least in part on a second indication included in the RAR message; and

interpret an uplink resource assignment included in the RAR message as the determined type of uplink resource assignment.

29. The non-transitory computer-readable medium of claim 28 , wherein the code is executable by the processor to:

identify, based at least in part on the indication, only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability of the network access device; and

interpret an uplink resource assignment included in the RAR message as a CP-OFDM waveform resource assignment.

30. A method for wireless communication at a network access device, comprising:

transmitting an indication of at least one receive capability of the network access device;

receiving, from a user equipment (UE), a first message of a random access channel (RACH) procedure;

transmitting a random access response (RAR) message to the UE, in response to receiving the first message, the RAR message having a format based at least in part on the at least one receive capability of the network access device;

wherein the at least one receive capability comprises both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability, the method further comprising:

identifying a type of uplink resource assignment included in the RAR message using a second indication included in the RAR message, wherein the format of the RAR message comprises the identified type of uplink resource assignment.

31. The method of claim 30 , wherein the at least one receive capability comprises only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability, and the format of the RAR message comprises a CP-OFDM waveform resource assignment.

32. The method of claim 31 , further comprising:

receiving, based at least in part on the CP-OFDM waveform resource assignment, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

33. The method of claim 30 , wherein the identified type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

34. The method of claim 30 , further comprising:

receiving, based at least in part on the type of uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

35. The method of claim 30 , wherein the indication of the at least one receive capability of the network access device is transmitted in system information.

36. The method of claim 35 , wherein the transmitted system information comprises at least one of: a minimum system information (MSI) transmitted on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) transmitted on a physical downlink shared channel (PDSCH), or a combination thereof.

37. The method of claim 30 , wherein the first message is received according to a predetermined uplink resource assignment.

38. The method of claim 37 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

39. An apparatus for wireless communication at a network access device, comprising:

means for transmitting an indication of at least one receive capability of the network access device;

means for receiving, from a user equipment (UE), a first message of a random access channel (RACH) procedure;

means for transmitting a random access response (RAR) message to the UE, in response to receiving the first message, the RAR message having a format based at least in part on the at least one receive capability of the network access device;

wherein the at least one receive capability comprises both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability, the apparatus further comprising:

means for identifying a type of uplink resource assignment included in the RAR message using a second indication included in the RAR message, wherein the format of the RAR message comprises the identified type of uplink resource assignment.

40. The apparatus of claim 39 , wherein the at least one receive capability comprises only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability, and the format of the RAR message comprises a CP-OFDM waveform resource assignment.

41. The apparatus of claim 40 , further comprising:

means for receiving, based at least in part on the CP-OFDM waveform resource assignment, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

42. The apparatus of claim 39 , wherein the identified type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

43. The apparatus of claim 39 , further comprising:

means for receiving, based at least in part on the type of uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

44. The apparatus of claim 39 , wherein the indication of the at least one receive capability of the network access device is transmitted in system information.

45. The apparatus of claim 44 , wherein the transmitted system information comprises at least one of: a minimum system information (MSI) transmitted on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) transmitted on a physical downlink shared channel (PDSCH), or a combination thereof.

46. The apparatus of claim 39 , wherein the first message is received according to a predetermined uplink resource assignment.

47. The apparatus of claim 46 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

48. An apparatus for wireless communication at a network access device, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory, the instructions being executable by the processor to:

transmit an indication of at least one receive capability of the network access device;

receive, from a user equipment (UE), a first message of a random access channel (RACH) procedure;

transmit a random access response (RAR) message to the UE, in response to receiving the first message, the RAR message having a format based at least in part on the at least one receive capability of the network access device;

wherein the at least one receive capability comprises both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency- division multiplexing (DFT-s-OFDM) waveform receive capability, and wherein the instructions are executable by the processor to:

identify a type of uplink resource assignment included in the RAR message using a second indication included in the RAR message, wherein the format of the RAR messaae comprises the identified type of uplink resource assianment.

49. The apparatus of claim 48 , wherein the at least one receive capability comprises only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability, and the format of the RAR message comprises a CP-OFDM waveform resource assignment.

50. The apparatus of claim 49 , wherein the instructions are executable by the processor to:

receive, based at least in part on the CP-OFDM waveform resource assignment, at least one of: a third message of the RACH procedure, or a physical uplink shared channel (PUSCH), or a physical uplink control channel (PUCCH), or a combination thereof.

51. The apparatus of claim 48 , wherein the identified type of uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

52. The apparatus of claim 48 , wherein the instructions are executable by the processor to:

receive based at least in part on the type of uplink resource assignment included in the RAR message, at least one of: a third message of the RACH procedure, or a PUSCH, or a PUCCH, or a combination thereof.

53. The apparatus of claim 48 , wherein the indication of the at least one receive capability of the network access device is transmitted in system information.

54. The apparatus of claim 53 , wherein the transmitted system information comprises at least one of: a minimum system information (MSI) transmitted on a physical broadcast channel (PBCH), or a remaining minimum system information (RMSI) transmitted on a physical downlink shared channel (PDSCH), or a combination thereof.

55. The apparatus of claim 48 , wherein the first message is received according to a predetermined uplink resource assignment.

56. The apparatus of claim 55 , wherein the predetermined uplink resource assignment comprises a CP-OFDM waveform resource assignment or a DFT-s-OFDM waveform resource assignment.

57. A non-transitory computer-readable medium storing computer-executable code for wireless communication at a network access device, the code executable by a processor to:

transmit an indication of at least one receive capability of the network access device;

receive, from a user equipment (UE), a first message of a random access channel (RACH) procedure;

transmit a random access response (RAR) message to the UE, in response to receiving the first message, the RAR message having a format based at least in part on the at least one receive capability of the network access device;

wherein the at least one receive capability comprises both a CP-OFDM waveform receive capability and a discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform receive capability, and wherein the code is executable by the processor to:

identify a type of uplink resource assignment included in the RAR message using a second indication included in the RAR message, wherein the format of the RAR message comprises the identified type of uplink resource assignment.

58. The non-transitory computer-readable medium of claim 57 , wherein the at least one receive capability comprises only a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform receive capability, and the format of the RAR message comprises a CP-OFDM waveform resource assignment.