Two-step random access physical uplink shared channel allocation over multiple resource block sets

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

receiving a configuration for a message A (Msg A) physical random access channel (PRACH) over a resource block (RB) set for a two-step random access channel (RACH) operation;

receiving one or more parameters for a Msg A physical uplink shared channel (PUSCH) configuration; and

transmitting a Msg A PUSCH in a configured Msg A PRACH occasion and a Msg A PUSCH resource, the Msg A PUSCH resource being based on the RB set configured for the Msg A PRACH and the one or more parameters for the Msg A PUSCH configuration.

2. The method of claim 1 , wherein the Msg A PUSCH comprises an interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a starting interlace for the Msg A PUSCH that the UE applies as the starting interlace in the RB set configured for the Msg A PRACH.

3. The method of claim 1 , wherein the Msg A PUSCH comprises an interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a number of interlaces for the Msg A PUSCH that the UE applies as the number of interlaces in the RB set configured for the Msg A PRACH.

4. The method of claim 1 , wherein the Msg A PUSCH comprises an interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a number of frequency division multiplexed (FDM) PUSCH occasions (POs) for the Msg A PUSCH that the UE applies as the number of FDM POs as a number of interlace based POs in the RB configured for the Msg A PRACH.

5. The method of claim 1 , wherein the Msg A PUSCH comprises a non-interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a starting offset for the Msg A PUSCH that the UE applies as a frequency start for the Msg A PUSCH from a lowest resource block in the RB set configured for the Msg A PRACH.

6. The method of claim 1 , wherein the Msg A PUSCH comprises a non-interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a number of frequency division multiplexed (FDM) PUSCH occasions (POs) for the Msg A PUSCH that the UE applies as a number of POs in the RB set configured for the Msg A PRACH.

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

memory; and

at least one processor coupled to the memory and configured to cause the UE to:

receive a configuration for a message A (Msg A) physical random access channel (PRACH) over a resource block (RB) set for a two-step random access channel (RACH) operation;

receive one or more parameters for a Msg A physical uplink shared channel (PUSCH) configuration; and

transmit the Msg A PUSCH in a configured Msg A PRACH occasion and a Msg A PUSCH resource, the Msg A PUSCH resource being based on the RB set configured for the Msg A PRACH and the one or more parameters for the configuration for the Msg A PUSCH.

8. The apparatus of claim 7 , wherein the Msg A PUSCH comprises an interlaced waveform, and the one or more parameters for the Msg A PUSCH configuration include at least one of:

a starting interlace for the Msg A PUSCH to be applied as the starting interlace in the RB set configured for the Msg A PRACH,

a number of interlaces for the Msg A PUSCH to be applied as the number of interlaces in the RB set configured for the Msg A PRACH, or

a number of frequency division multiplexed (FDM) PUSCH occasions (POs) for the Msg A PUSCH to be applied as the number of FDM POs in the RB set configured for the Msg A PRACH.

9. The apparatus of claim 8 , wherein the one or more parameters for the Msg A PUSCH configuration include the starting interlace for the Msg A PUSCH, and the Msg A PUSCH resources is based on the starting interlace in the RB set configured for the Msg A PRACH.

10. The apparatus of claim 8 , wherein the one or more parameters for the Msg A PUSCH configuration include the number of interlaces for the Msg A PUSCH, and the Msg A PUSCH resource is based on application of the number of interlaces in the RB set configured for the Msg A PRACH.

11. The apparatus of claim 8 , wherein the one or more parameters for the Msg A PUSCH configuration include the number of FDM POs for the Msg A PUSCH, and the Msg A PUSCH resource is based on application of the number of FDM POs as a number of interlace based POs in the RB configured for the Msg A PRACH.

12. The apparatus of claim 7 , wherein the Msg A PUSCH comprises a non-interlaced waveform, and the one or more parameters include at least one of:

a starting offset for the Msg A PUSCH to be applied from a lowest resource block in the RB set configured for the Msg A PRACH,

or

a number of frequency division multiplexed (FDM) POs for the Msg A PUSCH to be applied as a number of POs in the RB set configured for the Msg A PRACH.

13. The apparatus of claim 12 , wherein the one or more parameters for the Msg A PUSCH configuration include the starting offset for the Msg A PUSCH, and the Msg A PUSCH resource is based on a frequency start for the Msg A PUSCH from the lowest resource block in the RB set configured for the Msg A PRACH.

14. The apparatus of claim 12 , wherein the one or more parameters for the Msg A PUSCH configuration include the number of FDM POs for the Msg A PUSCH and the Msg A PUSCH resource is based on application of the number of POs in the RB set configured for the Msg A PRACH.

15. The apparatus of claim 12 , wherein the one or more parameters further include at least one of:

a number of resource blocks, or

a guard band between PUSCH occasions (POs).

16. The apparatus of claim 7 , further comprising:

an antenna; and

a transceiver coupled to the antenna and the at least one processor.

17. A method of wireless communication at a base station, comprising:

transmitting a configuration for a message A (Msg A) physical random access channel (PRACH) over a resource block (RB) sets for a two-step random access channel (RACH) operation;

indicating one or more parameters for a Msg A physical uplink shared channel (PUSCH) configuration; and

receiving a Msg A in a configured Msg A PRACH occasion and an identified Msg A PUSCH resource based on an RB set configured for the Msg A PRACH and the one or more parameters for the Msg A PUSCH configuration.

18. The method of claim 17 , wherein the Msg A PUSCH comprises an interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a starting interlace for the Msg A PUSCH for application as the starting interlace in the RB set configured for the Msg A PRACH.

19. The method of claim 17 , wherein the Msg A PUSCH comprises an interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a number of interlaces for the Msg A PUSCH for application as the number of interlaces in the RB set configured for the Msg A PRACH.

20. The method of claim 17 , wherein the Msg A PUSCH comprises an interlaced waveform and the one or more parameters for the Msg A PUSCH configuration include a number of frequency division multiplexed (FDM) PUSCH occasions (POs) for the Msg A PUSCH for application as the number of FDM POs as a number of interlace based POs in the RB set configured for the Msg A PRACH.

21. The method of claim 17 , wherein the Msg A PUSCH comprises a non-interlaced waveform, and the one or more parameters for the Msg A PUSCH configuration include a starting offset for the Msg A PUSCH for application as a frequency start for the Msg A PUSCH from a lowest resource block in the RB set configured for the Msg A PRACH.

22. The method of claim 17 , wherein the Msg A PUSCH comprises a non-interlaced waveform, and the one or more parameters for the Msg A PUSCH configuration include a number of frequency division multiplexed (FDM) PUSCH occasions (POs) for the Msg A PUSCH for application as a number of POs in the RB set configured for the Msg A PRACH.

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

memory; and

at least one processor coupled to the memory and configured to cause the base station to:

transmit a configuration for a message A (Msg A) physical random access channel (PRACH) over a resource block (RB) sets for a two-step random access channel (RACH) operation;

indicate one or more parameters for a Msg A physical uplink shared channel (PUSCH) configuration; and

receive a Msg A in a configured Msg A PRACH occasion and an identified Msg A PUSCH resource based on an RB set configured for the Msg A PRACH and the one or more parameters for the Msg A PUSCH configuration.

24. The apparatus of claim 23 , wherein a Msg A PUSCH comprises an interlaced waveform, and the one or more parameters for the Msg A PUSCH configuration include at least one of:

a starting interlace for the Msg A PUSCH to be applied as the starting interlace in the RB set configured for the Msg A PRACH,

a number of interlaces for the Msg A PUSCH to be applied as the number of interlaces in the RB set configured for the Msg A PRACH, or

a number of frequency division multiplexed (FDM) PUSCH occasions (POs) for the Msg A PUSCH to be applied as the number of FDM POs in the RB set configured for the Msg A PRACH.

25. The apparatus of claim 24 , wherein the one or more parameters for the Msg A PUSCH configuration include the starting interlace for the Msg A PUSCH for application as the starting interlace in the RB set configured for the Msg A PRACH.

26. The apparatus of claim 24 , wherein the one or more parameters for the Msg A PUSCH configuration include the number of interlaces for the Msg A PUSCH for application as the number of interlaces in the RB set configured for the Msg A PRACH.

27. The apparatus of claim 24 , wherein the one or more parameters for the Msg A PUSCH configuration include the number of FDM POs for the Msg A PUSCH for application as the number of FDM POs as a number of interlace based POs in the RB set configured for the Msg A PRACH.

28. The apparatus of claim 23 , wherein a Msg A PUSCH comprises a non-interlaced waveform, and the one or more parameters include at least one of:

a starting offset for the Msg A PUSCH to be applied from a lowest resource block in the RB set configured for the Msg A PRACH,

or

a number of frequency division multiplexed (FDM) POs for the Msg A PUSCH to be applied as a number of POs in the RB set configured for the Msg A PRACH.

29. The apparatus of claim 28 , wherein the one or more parameters for the Msg A PUSCH configuration include the starting offset for the Msg A PUSCH for application as a frequency start for the Msg A PUSCH from the lowest resource block in the RB set configured for the Msg A PRACH.

30. The apparatus of claim 28 , wherein the one or more parameters for the Msg A PUSCH configuration include the number of FDM POs for the Msg A PUSCH for application as the number of POs in the RB set configured for the Msg A PRACH.

31. The apparatus of claim 28 , wherein the one or more parameters further include at least one of:

a number of resource blocks, or

a guard band between PUSCH occasions (POs).

32. The apparatus of claim 23 , further comprising:

an antenna; and

a transceiver coupled to the antenna and the at least one processor.