Timing offset selection in non-terrestrial network
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a non-terrestrial network (NTN) entity, a message that is associated with an uplink grant. The UE may select, based at least in part on the message, either a cell-specific offset or an updated offset that is indicated after initial access, as a timing offset that accounts for a propagation delay between a base station of the NTN and the UE. The UE may transmit, to the NTN entity, an uplink communication using the timing offset. Numerous other aspects are described.
1. A network entity for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
transmit a message, comprising downlink control information (DCI) that is scrambled with a type of radio network temporary identifier (RNTI); and
receive, from a user equipment (UE), using a cell-specific timing offset based at least in part on the type of RNTI, hybrid automatic repeat request (HARQ) feedback in association with one or more of initial access or random access, wherein the cell-specific timing offset is included in a previously transmitted message and the cell-specific timing offset accounts for a propagation delay between the network entity, of a non-terrestrial network (NTN), and the UE.
2. The network entity of claim 1 , wherein the previously transmitted message comprises a system information block.
3. The network entity of claim 2 , wherein the one or more processors are further to:
transmit the system information block in a broadcast message within a cell associated with the UE.
4. The network entity of claim 1 , wherein the one or more processors are configured to transmit an indication of an updated timing offset.
5. The network entity of claim 4 , wherein the updated timing offset is a UE-specific timing offset.
6. The network entity of claim 4 , wherein the updated timing offset is an update over the cell-specific timing offset.
7. The network entity of claim 4 , wherein a duration of the updated timing offset is shorter than a duration of the cell-specific timing offset.
8. The network entity of claim 1 , wherein the type of RNTI is a MsgB-RNTI.
9. The network entity of claim 1 , wherein the one or more processors are configured to receive a physical uplink shared channel (PUSCH) communication using a UE-specific timing offset based at least in part on transmitting downlink control information that does not include a resource allocation.
10. The network entity of claim 1 , wherein the previously transmitted message comprises the DCI.
11. The network entity of claim 1 , wherein the previously transmitted message comprises a radio resource control message.
12. The network entity of claim 1 , wherein the previously transmitted message comprises a medium access-control (MAC) control element (CE) message.
13. A network entity for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
transmit a message, to a user equipment (UE), comprising downlink control information (DCI) that is scrambled with a type of radio network temporary identifier (RNTI); and
receive, from the UE, using a cell-specific timing offset based at least in part on the type of RNTI, a physical uplink shared channel (PUSCH) communication in association with one or more of initial access or random access, wherein the cell-specific timing offset is included in a previously transmitted message and the cell-specific timing offset accounts for a propagation delay between the network entity, of a non-terrestrial network (NTN) and the UE.
14. The network entity of claim 13 , wherein the previously transmitted message comprises a system information block.
15. The network entity of claim 14 , wherein the one or more processors are further to:
transmit the system information block in a broadcast message within a cell associated with the UE.
16. The network entity of claim 13 , wherein the one or more processors are configured to transmit an indication of an updated timing offset.
17. The network entity of claim 16 , wherein the updated timing offset is a UE-specific timing offset.
18. The network entity of claim 16 , wherein the updated timing offset is an update over the cell-specific timing offset.
19. The network entity of claim 16 , wherein a duration of the updated timing offset is shorter than a duration of the cell-specific timing offset.
20. The network entity of claim 13 , wherein the type of RNTI is a MsgB-RNTI.
21. The network entity of claim 13 , wherein the one or more processors are configured to receive a physical uplink shared channel (PUSCH) communication using a UE-specific timing offset based at least in part on transmitting downlink control information that does not include a resource allocation.
22. The network entity of claim 13 , wherein the previously transmitted message comprises the DCI.
23. The network entity of claim 13 , wherein the previously transmitted message comprises a radio resource control message.
24. The network entity of claim 13 , wherein the previously transmitted message comprises a medium access-control (MAC) control element (CE) message.
25. A method of wireless communication performed by a network entity, comprising:
transmitting a message, comprising downlink control information (DCI) that is scrambled with a type of radio network temporary identifier (RNTI); and
receiving, from a user equipment (UE), using a cell-specific timing offset based at least in part on the type of RNTI, hybrid automatic repeat request (HARQ) feedback in association with one or more of initial access or random access, wherein the cell-specific timing offset is included in a previously transmitted message and the cell-specific timing offset accounts for a propagation delay between the network entity, of a non-terrestrial network (NTN), and the UE.
26. The method of claim 25 , wherein the previously transmitted message comprises a system information block.
27. The method of claim 26 , further comprising
transmitting the system information block in a broadcast message within a cell associated with the UE.
28. The method of claim 25 , wherein the type of RNTI is a MsgB-RNTI.
29. A method of wireless communication performed by a network entity, comprising:
transmitting a message, to a user equipment (UE), comprising downlink control information (DCI) that is scrambled with a type of radio network temporary identifier (RNTI); and
receiving, from the UE, using a cell-specific timing offset based at least in part on the type of RNTI, a physical uplink shared channel (PUSCH) communication in association with one or more of initial access or random access, wherein the cell-specific timing offset is included in a previously transmitted message and the cell-specific timing offset accounts for a propagation delay between the network entity, of a non-terrestrial network (NTN) and the UE.
30. The method of claim 29 , wherein the previously transmitted message comprises a system information block.