Methods for timing advance indication and timing relationships indication for non-terrestrial networks
A method of enabling communication between a user equipment (UE) and a non-terrestrial network (NTN), is described. The UE may be able to calculate a timing advance compensation. The timing advance compensation may be a differential or full timing advance compensation. An offset value, K offset , may be indicated to the UE. The K offset value may be used for timing relationships.
1. A method of enabling communication between a user equipment (UE) and a non-terrestrial network (NTN), comprising:
receiving, at the UE, satellite position data of the NTN;
determining, at the UE, a UE position;
calculating, at the UE, a first distance between the UE position and the satellite position data;
calculating, at the UE, a timing advance based on the first distance;
receiving, at the UE, a K offset value, wherein the K offset value is transmitted to the UE by the NTN; and
applying, at the UE, one or both of the timing advance and K offset to configure transmission or reception of communication with the NTN.
2. The method of claim 1 , wherein the satellite position data is ephemeris or positional data.
3. The method of claim 1 , wherein the UE further receives a gateway position data.
4. The method of claim 3 , wherein the UE further calculates a second distance between the satellite position data and the gateway position data.
5. The method of claim 4 , wherein the UE further calculates the timing advance by
dividing the first distance by a speed to obtain a first propagation delay,
dividing the second distance by the speed to obtain a second propagation delay,
summing the first propagation delay and the second propagation delay, and doubling the sum.
6. The method of claim 4 , wherein the timing advance is a full timing advance compensation.
7. The method of claim 1 , wherein the UE further receives a reference point position data, wherein the reference point position data is on a feeder link.
8. The method of claim 7 , wherein the UE further receives a common timing advance value.
9. The method of claim 8 , wherein the UE further calculates a third distance between the reference point position data and the satellite position data.
10. The method of claim 9 , wherein the UE further calculates the timing advance by
dividing the first distance by a speed to obtain a first propagation delay,
dividing the third distance by the speed to obtain a third propagation delay,
summing the first propagation delay, the third propagation delay, and the common timing advance value, and
doubling the sum.
11. The method of claim 10 , wherein the timing advance is one of a full timing advance compensation and a differential timing advance compensation.
12. The method of claim 7 , wherein the reference point position data is the satellite position data.
13. The method of claim 1 , wherein the UE further receives a reference point position data, wherein the reference point position data is located in a cell that the UE is located in.
14. The method of claim 13 , wherein the UE further receives a common timing advance value.
15. The method of claim 14 , wherein the UE further calculates a fourth distance between the reference point position data and the satellite position data.
16. The method of claim 15 , wherein the UE further calculates a differential timing advance by
dividing the first distance by a speed to obtain a first propagation delay,
dividing the fourth distance by the speed to obtain a fourth propagation delay,
subtracting the fourth propagation delay from the first propagation delay, and doubling the subtraction.
17. The method of claim 1 , wherein the UE receives the K offset value in a group common DCI format, and/or a MAC-CE format, and the K offset value is a fixed number of bits.
18. The method of claim 17 , wherein the K offset value is specific to the UE.
19. The method of claim 17 , wherein the K offset value is used in a configured grant type 1 transmission, wherein the UE adds an offset of K offset multiplied by a number of symbols per slot value to a timing for the configured grant type 1 transmission.
20. The method of claim 17 , wherein the K offset value is used in a configured grant type 2 transmission, wherein the UE schedules to transmit a Physical Uplink Shared Channel (PUSCH) by a DCI by adding a K offset value to the configured grant type 2 transmission.
21. The method of claim 17 , wherein the K offset value is used for a slot format indicator (SFI) to dynamically configure and reconfigure symbols or slots in a subframe, wherein the UE configures and reconfigures symbols or slots at least K offset slots after an uplink slot.
22. The method of claim 17 , wherein the K offset value is used for timing for a PUSCH transmission scheduled by DCI.
23. The method of claim 17 , wherein the K offset value is used for timing for a Channel State Information (CSI) transmission on a PUSCH.
24. The method of claim 17 , wherein the K offset value is used for timing for a PUSCH transmission scheduled by a Random Access Response (RAR) grant.
25. The method of claim 17 , wherein the K offset value is used for Hybrid Automatic Repeat Request Acknowledgement (HARQ-ACK) transmission on Physical Uplink Control Channel (PUCCH).
26. The method of claim 1 , wherein the K offset value is greater than or equal to the timing advance.
27. The method of claim 17 , wherein the K offset value is used for timing for aperiodic SRS transmission.
28. The method of claim 17 , wherein the K offset value is used for timing for CSI reference resource transmission.
29. A system that enables communication between a user equipment (UE) and a non-terrestrial network (NTN), the system configured to:
receive, at the UE, satellite position data of the NTN;
determine, at the UE, a UE position;
calculate, at the UE, a first distance between the UE position and the satellite position data;
calculate, at the UE, a timing advance based on the first distance;
receive, at the UE, a K offset value, wherein the K offset value is configured to be transmitted to the UE by the NTN; and
apply, at the UE, one or both of the timing advance and the K offset to configure transmission or reception of communication with the NTN.
30. The system of claim 29 , further configured to receive a reference point position data.
31. The system of claim 30 , further configured to receive a common timing advance value.
32. The system of claim 31 , wherein the UE further calculates a third distance between the reference point position data and the satellite position data.
33. The system of claim 32 , wherein the UE further calculates the timing advance by
dividing the first distance by a speed to obtain a first propagation delay,
dividing the third distance by the speed to obtain a third propagation delay,
summing the first propagation delay, the third propagation delay, and the common timing advance value, and
doubling the sum.
34. The system of claim 33 , wherein the timing advance is one of a full timing advance compensation and a differential timing advance compensation.
35. The system of claim 33 , wherein the reference point is the satellite position data.
36. The system of claim 29 , wherein the system receives the K offset value in a group common DCI format, and/or a MAC-CE format, and the K offset value is a fixed number of bits.