Variable uplink response and/or scheduling delays for non-terrestrial networks
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station (BS) may determine at least one of a variable random access response (RAR) window start time, a variable maximum quantity of slots for an index of a first slot of a physical random access channel occasion, or scheduling information related to one or more variable delays for an uplink transmission. The BS may transmit, to a user equipment, at least one of information that identifies the RAR window start time, information that identifies the variable maximum quantity of slots, or the scheduling information. Numerous other aspects are provided.
1. A method of wireless communication performed by a user equipment (UE), comprising:
receiving information that identifies a variable random access response (RAR) window start time; and
searching for an RAR from the variable RAR window start time until an RAR window size elapses,
wherein the variable RAR window start time is greater than or equal to a value determined based at least in part on a feeder link delay and a service link delay.
2. The method of claim 1 , wherein the variable RAR window start time is associated with at least one of:
a particular beam, or
a particular satellite.
3. The method of claim 1 , further comprising:
receiving information that identifies a variable maximum quantity of slots for an index of a first slot of a physical random access channel (PRACH) occasion, wherein a random access procedure associated with the RAR is performed in accordance with the variable maximum quantity of slots for the index of the first slot of the PRACH occasion.
4. The method of claim 3 , wherein the index of the first slot of the PRACH occasion is between zero and another variable maximum quantity of slots.
5. The method of claim 3 , wherein the index is located within a variable duration of time that is signaled from a base station or is preconfigured for the UE.
6. The method of claim 1 , further comprising:
receiving an indication of the RAR window size.
7. The method of claim 1 , wherein the RAR includes a cyclic redundancy check (CRC) scrambled by a random access radio network temporary identifier (RA-RNTI).
8. The method of claim 1 , wherein the value is determined further based at least in part on a base station processing time.
9. The method of claim 8 , wherein the value is determined further based at least in part on a beam-dependent delay.
10. A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive information that identifies a variable random access response (RAR) window start time; and
search for an RAR from the variable RAR window start time until an RAR window size elapses,
wherein the variable RAR window start time is greater than or equal to a value determined based at least in part on a feeder link delay and a service link delay.
11. The UE of claim 10 , wherein the variable RAR window start time is associated with at least one of:
a particular beam, or
a particular satellite.
12. The UE of claim 10 , wherein the one or more processors are further configured to:
receive information that identifies a variable maximum quantity of slots for an index of a first slot of a physical random access channel (PRACH) occasion, wherein a random access procedure associated with the RAR is performed in accordance with the variable maximum quantity of slots for the index of the first slot of the PRACH occasion.
13. The UE of claim 12 , wherein the index of the first slot of the PRACH occasion is between zero and another variable maximum quantity of slots.
14. The UE of claim 12 , wherein the index is located within a variable duration of time that is signaled from a base station or is preconfigured for the UE.
15. The UE of claim 10 , wherein the one or more processors are further configured to:
receive an indication of the RAR window size.
16. The UE of claim 10 , wherein the RAR includes a cyclic redundancy check (CRC) scrambled by a random access radio network temporary identifier (RA-RNTI).
17. The UE of claim 10 , wherein the value is determined further based at least in part on a base station processing time.
18. The UE of claim 17 , wherein the value is determined further based at least in part on a beam-dependent delay.
19. An apparatus for wireless communication, comprising:
means for receiving information that identifies a variable random access response (RAR) window start time; and
means for searching for an RAR from the variable RAR window start time until an RAR window size elapses,
wherein the variable RAR window start time is greater than or equal to a value determined based at least in part on a feeder link delay and a service link delay.
20. The apparatus of claim 19 , wherein the variable RAR window start time is associated with at least one of:
a particular beam, or
a particular satellite.