Variable random access channel contention resolution window in a non-terrestrial network

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

transmitting a physical uplink shared channel (PUSCH) message associated with a random access channel (RACH) procedure to a non-terrestrial network node;

calculating a round-trip delay (RTD) between the UE and the non-terrestrial network node; and

monitoring, after transmitting the PUSCH message and waiting a variable time period, a physical downlink control channel (PDCCH) for a contention resolution message during a contention resolution window, wherein the variable time period is based at least in part on:

the RTD between the UE and the non-terrestrial network node,

a feeder link delay between a gateway and the non-terrestrial network node, and

a service link delay between the UE and the non-terrestrial network node.

2. The method of claim 1 , wherein the variable time period has a value that is based at least in part on the RTD between the UE and the non-terrestrial network node.

3. The method of claim 1 , wherein the variable time period has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

4. The method of claim 1 , wherein the variable time period has a value based at least in part on a random access response window start time and a delta.

5. The method of claim 4 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

6. The method of claim 4 , wherein the delta has a value based at least in part on a maximum one-way differential delay within a beam used for communication between the UE and the non-terrestrial network node.

7. The method of claim 1 , wherein the variable time period has a value based at least in part on a network-signaled round-trip delay at a center of a beam used for communication between the UE and the non-terrestrial network node and a delta.

8. The method of claim 7 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

9. The method of claim 7 , wherein the delta has a value based at least in part on a maximum one-way differential delay within the beam used for communication between the UE and the non-terrestrial network node.

10. The method of claim 1 , wherein the contention resolution window has an extended duration based at least in part on an expected arrival time for the contention resolution message in a terrestrial network and an additional time based at least in part on a communication delay between the UE and the non-terrestrial network node.

11. The method of claim 10 , wherein the variable time period has a null value.

12. The method of claim 1 , wherein the variable time period is further based at least in part on at least one of a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the gateway, and a differential delay within a beam used for communication between the UE and the non-terrestrial network node.

13. The method of claim 1 , wherein the variable time period is further based at least in part on a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the non-terrestrial network node, and a differential delay within a beam used for communication between the UE and the non-terrestrial network node.

14. A user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors coupled with the memory, the one or more processors configured to:

transmit a physical uplink shared channel (PUSCH) message associated with a random access channel (RACH) procedure to a non-terrestrial network node;

calculate a round-trip delay (RTD) between the UE and the non-terrestrial network node; and

monitor, after transmitting the PUSCH message and waiting a variable time period, a physical downlink control channel (PDCCH) for a contention resolution message during a contention resolution window, wherein the variable time period is based at least in part on:

the RTD between the UE and the non-terrestrial network node,

a feeder link delay between a gateway and the non-terrestrial network node, and

a service link delay between the UE and the non-terrestrial network node.

15. The UE of claim 14 , wherein the variable time period has a value that is based at least in part on the RTD between the UE and the non-terrestrial network node.

16. The UE of claim 14 , wherein the variable time period has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

17. The UE of claim 14 , wherein the variable time period has a value based at least in part on a random access response window start time and a delta.

18. The UE of claim 17 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

19. The UE of claim 17 , wherein the delta has a value based at least in part on a maximum one-way differential delay within a beam used for communication between the UE and the non-terrestrial network node.

20. The UE of claim 14 , wherein the variable time period has a value based at least in part on a network-signaled round-trip delay at a center of a beam used for communication between the UE and the non-terrestrial network node and a delta.

21. The UE of claim 20 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

22. The UE of claim 20 , wherein the delta has a value based at least in part on a maximum one-way differential delay within the beam used for communication between the UE and the non-terrestrial network node.

23. The UE of claim 14 , wherein the contention resolution window has an extended duration based at least in part on an expected arrival time for the contention resolution message in a terrestrial network and an additional time based at least in part on a communication delay between the UE and the non-terrestrial network node.

24. The UE of claim 23 , wherein the variable time period has a null value.

25. The UE of claim 14 , wherein the variable time period is further based at least in part on at least one of a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the gateway, and a differential delay within a beam used for communication between the UE and the non-terrestrial network node.

26. The UE of claim 14 , wherein the variable time period is further based at least in part on a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the non-terrestrial network node, and a differential delay within a beam used for communication between the UE and the non-terrestrial network node.

27. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:

one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:

transmit a physical uplink shared channel (PUSCH) message associated with a random access channel procedure to a non-terrestrial network node;

calculate a round-trip delay (RTD) between the UE and the non-terrestrial network node; and

monitor, after transmitting the PUSCH message and waiting a variable time period, a physical downlink control channel (PDCCH) for a contention resolution message during a contention resolution window, wherein the variable time period is based at least in part on:

the RTD between the UE and the non-terrestrial network node,

a feeder link delay between a gateway and the non-terrestrial network node, and

a service link delay between the UE and the non-terrestrial network node.

28. The non-transitory computer-readable medium of claim 27 , wherein the variable time period has a value that is based at least in part on the RTD between the UE and the non-terrestrial network node.

29. The non-transitory computer-readable medium of claim 27 , wherein the variable time period has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

30. The non-transitory computer-readable medium of claim 27 , wherein the variable time period has a value based at least in part on a random access response window start time and a delta.

31. The non-transitory computer-readable medium of claim 30 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

32. The non-transitory computer-readable medium of claim 30 , wherein the delta has a value based at least in part on a maximum one-way differential delay within a beam used for communication between the UE and the non-terrestrial network node.

33. The non-transitory computer-readable medium of claim 27 , wherein the variable time period has a value based at least in part on a network-signaled round-trip delay at a center of a beam used for communication between the UE and the non-terrestrial network node and a delta.

34. The non-transitory computer-readable medium of claim 33 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the UE in one or more downlink messages associated with the RACH procedure.

35. The non-transitory computer-readable medium of claim 33 , wherein the delta has a value based at least in part on a maximum one-way differential delay within the beam used for communication between the UE and the non-terrestrial network node.

36. The non-transitory computer-readable medium of claim 27 , wherein the contention resolution window has an extended duration based at least in part on an expected arrival time for the contention resolution message in a terrestrial network and an additional time based at least in part on a communication delay between the UE and the non-terrestrial network node.

37. The non-transitory computer-readable medium of claim 36 , wherein the variable time period has a null value.

38. The non-transitory computer-readable medium of claim 27 , wherein the variable time period is further based at least in part on at least one of a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the gateway, and a differential delay within a beam used for communication between the UE and the non-terrestrial network node.

39. The non-transitory computer-readable medium of claim 27 , wherein the variable time period is further based at least in part on a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the non-terrestrial network node, and a differential delay within a beam used for communication between the UE and the non-terrestrial network node.

40. An apparatus for wireless communication, comprising:

means for transmitting a physical uplink shared channel (PUSCH) message associated with a random access channel procedure to a non-terrestrial network node;

means for calculating a round-trip delay (RTD) between the apparatus and the non-terrestrial network node; and

means for monitoring, after transmitting the PUSCH message and waiting a variable time period, a physical downlink control channel (PDCCH) for a contention resolution message during a contention resolution window, wherein the variable time period is transmitted, based at least in part on the:

RTD between the apparatus and the non-terrestrial network node,

a feeder link delay between a gateway and the non-terrestrial network node, and

a service link delay between the apparatus and the non-terrestrial network node.

41. The apparatus of claim 40 , wherein the variable time period has a value that is based at least in part on the RTD between the apparatus and the non-terrestrial network node.

42. The apparatus of claim 40 , wherein the variable time period has one or more of a predefined value or a network-determined value that is signaled to the apparatus in one or more downlink messages associated with the RACH procedure.

43. The apparatus of claim 40 , wherein the variable time period has a value based at least in part on a random access response window start time and a delta.

44. The apparatus of claim 43 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the apparatus in one or more downlink messages associated with the RACH procedure.

45. The apparatus of claim 43 , wherein the delta has a value based at least in part on a maximum one-way differential delay within a beam used for communication between the apparatus and the non-terrestrial network node.

46. The apparatus of claim 40 , wherein the variable time period has a value based at least in part on a network-signaled round-trip delay at a center of a beam used for communication between the apparatus and the non-terrestrial network node and a delta.

47. The apparatus of claim 46 , wherein the delta has one or more of a predefined value or a network-determined value that is signaled to the apparatus in one or more downlink messages associated with the RACH procedure.

48. The apparatus of claim 46 , wherein the delta has a value based at least in part on a maximum one-way differential delay within the beam used for communication between the apparatus and the non-terrestrial network node.

49. The apparatus of claim 40 , wherein the contention resolution window has an extended duration based at least in part on an expected arrival time for the contention resolution message in a terrestrial network and an additional time based at least in part on a communication delay between the apparatus and the non-terrestrial network node.

50. The apparatus of claim 49 , wherein the variable time period has a null value.

51. The apparatus of claim 40 , wherein the variable time period is further based at least in part on at least one of a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the gateway, and a differential delay within a beam used for communication between the apparatus and the non-terrestrial network node.

52. The apparatus of claim 40 , wherein the variable time period is further based at least in part on a symbol time associated with the PUSCH message, a processing time associated with the PUSCH message at the non-terrestrial network node, and a differential delay within a beam used for communication between the apparatus and the non-terrestrial network node.