Measurement of a downlink positioning reference signal from a non-serving base station of a user equipment at a serving base station of the user equipment

1. A method of operating a serving base station of a user equipment (UE), comprising, comprising:

measuring a time of arrival (ToA) of a first downlink positioning reference signal (DL-PRS), received at the serving base station, from a non-serving base station of the UE;

measuring a ToA of an uplink sounding reference signal for positioning (UL-SRS-P) from the UE, received at the serving base station, that is transmitted in association with a second DL-PRS from the non-serving base station of the UE and received at the UE; and

transmitting measurement information based on the ToA measurements of the first DL-PRS and the UL-SRS-P to a position estimation entity.

2. The method of claim 1 ,

wherein the first and second DL-PRS correspond to the same DL-PRS, or

wherein the first and second DL-PRS correspond to different time divisional multiplexed (TDMed) or frequency division multiplexed (FDMed) DL-PRSs.

3. The method of claim 1 , wherein the first DL-PRS is received at the serving base station from the non-serving base station over a line-of-sight (LOS) path.

4. The method of claim 1 , wherein the measurement information comprises a time differential between the measured ToA of the first DL-PRS and the measured ToA of the UL-SRS-P.

5. The method of claim 1 , further comprising:

measuring an angle of arrival (AoA) of the UL-SRS-P,

wherein the measured AoA is included as part of the measurement information.

6. The method of claim 1 , further comprising:

measuring at least one additional ToA of at least one additional DL-PRS from at least one additional non-serving base station of the UE,

wherein the measurement information is further based on the measurement of the at least one additional ToA of the at least one additional DL-PRS.

7. The method of claim 6 , wherein the at least one additional DL-PRS is received at the serving base station from the at least one additional non-serving base station over at least one additional LOS path.

8. The method of claim 6 , wherein the measurement information comprises at least one time differential between the measured at least one ToA of the at least one additional DL-PRS and the measured ToA of the UL-SRS-P.

9. The method of claim 6 , further comprising:

measuring an angle of arrival (AoA) of the UL-SRS-P,

wherein the measured AoA is included as part of the measurement information.

10. The method of claim 6 , further comprising:

estimating an angle of arrival (AoA) of the UL-SRS-P relative to the serving base station via multilateration,

wherein the estimated AoA is included as part of the measurement information.

11. The method of claim 6 , wherein an angle of arrival (AoA) of the UL-SRS-P is not included as part of the measurement information.

12. A method of operating a position estimation entity, comprising:

receiving, from a serving base station of a user equipment (UE), first measurement information indicative of a first time differential between a time of arrival (ToA) of a first downlink positioning reference signal (DL-PRS) from a non-serving base station of the UE as measured at the serving base station, and a ToA of an uplink sounding reference signal for positioning (UL-SRS-P) from the UE as measured at the serving base station;

receiving, from the UE, second measurement information indicative of a second time differential between a ToA of second DL-PRS from the non-serving base station of the UE as measured at the UE and a time of transmission of the UL-SRS-P as measured at the UE; and

determining a positioning estimate of the UE based at least in part upon the first measurement information and the second measurement information.

13. The method of claim 12 ,

wherein the first and second DL-PRS correspond to the same DL-PRS, or

wherein the first and second DL-PRS correspond to different time divisional multiplexed (TDMed) or frequency division multiplexed (FDMed) DL-PRSs.

14. The method of claim 12 , wherein the first DL-PRS is received at the serving base station from the non-serving base station over a line-of-sight (LOS) path.

15. The method of claim 12 , wherein the first measurement information comprises the first time differential.

16. The method of claim 12 , wherein the first measurement information further comprises an angle of arrival (AoA) of the UL-SRS-P as measured or estimated at the serving base station.

17. The method of claim 12 , further comprising:

receiving, from the serving base station of the UE, third measurement information indicative of at least one additional time differential between at least one additional ToA of at least one additional DL-PRS from at least one additional non-serving base station of the UE as measured at the serving base station, and the ToA of the UL-SRS-P as measured the serving base station,

wherein the positioning estimate is further determined based at least in part upon the third measurement information.

18. The method of claim 17 , wherein the at least one additional DL-PRS is received at the serving base station from the at least one additional non-serving base station over at least one additional LOS path.

19. The method of claim 17 , wherein the positioning estimate is determined based at least in part upon a measured or estimated of the UL-SRS-P relative to the serving base station.

20. The method of claim 12 ,

wherein the position estimation entity corresponds to the UE, or

wherein the position estimation entity corresponds to a location management function (LMF) component integrated with, or separate from, the serving base station or the non-serving base station.

21. A serving base station of a user equipment (UE), comprising:

a memory;

at least one transceiver; and

at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:

measure a time of arrival (ToA) of a first downlink positioning reference signal (DL-PRS) from a non-serving base station of the UE;

measure a ToA of an uplink sounding reference signal for positioning (UL-SRS-P) from the UE that is transmitted in association with a second DL-PRS from the non-serving base station of the UE; and

transmit, via the at least one transceiver, measurement information based on the ToA measurements of the first DL-PRS and the UL-SRS-P to a position estimation entity.

22. The serving base station of claim 21 , wherein the first and second DL-PRS correspond to the same DL-PRS, or wherein the first and second DL-PRS correspond to different time divisional multiplexed (TDMed) or frequency division multiplexed (FDMed) DL-PRSs.

23. The serving base station of claim 21 , wherein the first DL-PRS is received at the serving base station from the non-serving base station over a line-of-sight (LOS) path.

24. The serving base station of claim 21 , wherein the measurement information comprises a time differential between the measured ToA of the first DL-PRS and the measured ToA of the UL-SRS-P.

25. The serving base station of claim 21 , wherein the at least one processor is further configured to:

measure an angle of arrival (AoA) of the UL-SRS-P,

wherein the measured AoA is included as part of the measurement information.

26. A position estimation entity, comprising:

a memory;

at least one transceiver; and

at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:

receive, via the at least one transceiver, from a serving base station of a user equipment (UE), first measurement information indicative of a first time differential between a time of arrival (ToA) of a first downlink positioning reference signal (DL-PRS) from a non-serving base station of the UE as measured the serving base station, and a ToA of an uplink sounding reference signal for positioning (UL-SRS-P) from the UE as measured the serving base station;

receive, via the at least one transceiver, from the UE, second measurement information indicative of a second time differential between a ToA of second DL-PRS from the non-serving base station of the UE as measured at the UE and a time of transmission of the UL-SRS-P as measured at the UE; and

determine a positioning estimate of the UE based at least in part upon the first measurement information and the second measurement information.

27. The position estimation entity of claim 26 ,

wherein the first and second DL-PRS correspond to the same DL-PRS, or

wherein the first and second DL-PRS correspond to different time divisional multiplexed (TDMed) or frequency division multiplexed (FDMed) DL-PRSs.

28. The position estimation entity of claim 26 , wherein the first DL-PRS is received at the serving base station from the non-serving base station over a line-of-sight (LOS) path.

29. The position estimation entity of claim 26 , wherein the first measurement information comprises the first time differential.

30. The position estimation entity of claim 26 , wherein the first measurement information further comprises an angle of arrival (AoA) of the UL-SRS-P as measured or estimated at the serving base station.

31. A method of operating a serving base station of a user equipment (UE), comprising, comprising:

measuring a time of arrival (ToA) of a first downlink positioning reference signal (DL-PRS) from a non-serving base station of the UE;

measuring at least one additional ToA of at least one additional DL-PRS from at least one additional non-serving base station of the UE;

measuring a ToA of an uplink sounding reference signal for positioning (UL-SRS-P) from the UE that is transmitted in association with a second DL-PRS from the non-serving base station of the UE; and

transmitting measurement information based on the ToA measurements of the first DL-PRS, the at least one additional DL-PRS, and the UL-SRS-P to a position estimation entity, wherein angle of arrival (AoA) of the UL-SRS-P is not included in the measurement information.

32. A method of operating a serving base station of a user equipment (UE), comprising, comprising:

measuring a time of arrival (ToA) of a first downlink positioning reference signal (DL-PRS) from a non-serving base station of the UE;

measuring a ToA of an uplink sounding reference signal for positioning (UL-SRS-P) from the UE, received only at the serving base station, that is transmitted in association with a second DL-PRS from the non-serving base station of the UE; and

transmitting measurement information based on the ToA measurements of the first DL-PRS and the UL-SRS-P to a position estimation entity.