LOS PROBABILITY MAP SIGNALING

20240057018

17/819589

August 12, 2022

Techniques for line-of-sight (LOS) probability map signaling are disclosed. The techniques can include receiving a positioning signal via a wireless link between the UE and a transmission/reception point (TRP) of a radio access network (RAN), identifying an LOS probability function associated with the wireless link based on LOS probability map information provided by a location management function (LMF) of a core network for the RAN, and generating an LOS probability estimate for the wireless link using the LOS probability function.

1. A method for wireless communication by a user equipment (UE), the method comprising: receiving a positioning signal via a wireless link between the UE and a transmission/reception point (TRP) of a radio access network (RAN); identifying a line-of-sight (LOS) probability function associated with the wireless link based on LOS probability map information provided by a location management function (LMF) of a core network for the RAN; and generating an LOS probability estimate for the wireless link using the LOS probability function.

2. The method of claim 1, wherein the LOS probability function corresponds to an LOS probability map region associated with the wireless link, wherein the LOS probability map information indicates vertex coordinates of the LOS probability map region.

3. The method of claim 1, comprising obtaining the LOS probability map information from a received non-access stratum (NAS) message.

4. The method of claim 1, comprising obtaining the LOS probability map information from a received radio resource control (RRC) message.

5. The method of claim 1, comprising obtaining the LOS probability map information from a received medium access control (MAC) control element (CE).

6. The method of claim 1, comprising identifying the LOS probability function from among multiple LOS probability functions associated with the wireless link, wherein each of the multiple LOS probability functions corresponds to a respective one of multiple LOS probability map regions associated with the wireless link.

7. The method of claim 6, comprising: determining a location estimate for the UE; identifying an LOS probability map region from among the multiple LOS probability map regions based on the location estimate; and identifying as the LOS probability function a one of the multiple LOS probability functions that corresponds to the identified LOS probability map region.

8. The method of claim 6, comprising: determining a location estimate for the UE; identifying two or more LOS probability map regions from among the multiple LOS probability map regions based on the location estimate; identifying two or more LOS probability functions comprising a corresponding LOS probability function for each of the two or more LOS probability map regions; and generating the LOS probability estimate using the two or more LOS probability functions.

9. The method of claim 1, comprising determining a position of the UE based on the LOS probability estimate.

10. The method of claim 1, comprising reporting the LOS probability estimate to the LMF.

11. A user equipment (UE), comprising: a transceiver; a memory; and one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to: receive a positioning signal via a wireless link between the UE and a transmission/reception point (TRP) of a radio access network (RAN); identify a line-of-sight (LOS) probability function associated with the wireless link based on LOS probability map information provided by a location management function (LMF) of a core network for the RAN; and generate an LOS probability estimate for the wireless link using the LOS probability function.

12. The UE of claim 11, wherein the LOS probability function corresponds to an LOS probability map region associated with the wireless link, wherein the LOS probability map information indicates vertex coordinates of the LOS probability map region.

13. The UE of claim 11, wherein the one or more processors are configured to obtain the LOS probability map information from a received non-access stratum (NAS) message.

14. The UE of claim 11, wherein the one or more processors are configured to obtain the LOS probability map information from a received radio resource control (RRC) message.

15. The UE of claim 11, wherein the one or more processors are configured to obtain the LOS probability map information from a received medium access control (MAC) control element (CE).

16. The UE of claim 11, wherein the one or more processors are configured to identify the LOS probability function from among multiple LOS probability functions associated with the wireless link, wherein each of the multiple LOS probability functions corresponds to a respective one of multiple LOS probability map regions associated with the wireless link.

17. The UE of claim 16, wherein the one or more processors are configured to: determine a location estimate for the UE; identify an LOS probability map region from among the multiple LOS probability map regions based on the location estimate; and identify as the LOS probability function a one of the multiple LOS probability functions that corresponds to the identified LOS probability map region.

18. The UE of claim 16, wherein the one or more processors are configured to: determine a location estimate for the UE; identify two or more LOS probability map regions from among the multiple LOS probability map regions based on the location estimate; identify two or more LOS probability functions comprising a corresponding LOS probability function for each of the two or more LOS probability map regions; and generate the LOS probability estimate using the two or more LOS probability functions.

19. The UE of claim 11, wherein the one or more processors are configured to determine a position of the UE based on the LOS probability estimate.

20. The UE of claim 11, wherein the one or more processors are configured to report the LOS probability estimate to the LMF.

21. A method for communication by a location management function (LMF) of a core network for a radio access network (RAN), the method comprising: determining, according to a line-of-sight (LOS) probability model, LOS probability map parameters for an LOS probability map region associated with a transmission/reception point (TRP) of the RAN; sending the LOS probability map parameters to a user equipment (UE) in the RAN; receiving, from the UE, feedback associated with the LOS probability map region; and training the LOS probability model based on the feedback.

22. The method of claim 21, wherein the LOS probability map parameters include vertex coordinates of the LOS probability map region.

23. The method of claim 21, wherein the LOS probability map parameters include a probability function for the LOS probability map region.

24. The method of claim 23, comprising updating the probability function based on the feedback.

25. The method of claim 24, wherein the feedback indicates: a location within the LOS probability map region; and an LOS probability estimate for the location.

26. The method of claim 21, wherein the feedback includes multipath information associated with a positioning reference signal (PRS) transmitted by the TRP.

27. The method of claim 21, comprising: determining a coarse location estimate for the UE; identifying the LOS probability map region based on the coarse location estimate for the UE; and sending the LOS probability map parameters for the LOS probability map region to the UE responsive to identifying the LOS probability map region.

28. The method of claim 21, comprising: receiving assistance data from the UE; and training the LOS probability model based on the assistance data and the feedback.

29. The method of claim 28, comprising: initiating a learning period for the LOS probability model; and receiving the assistance data from the UE during the learning period.

30. The method of claim 28, wherein the assistance data includes at least one of: a port identifier (ID); a panel ID; beamforming information; UE orientation information; a receive-transmit (Rx-Tx) turn-around time; and group delay information.

31. An apparatus for a location management function (LMF) of a core network for a radio access network (RAN), the apparatus comprising: at least one processor; and at least one memory communicatively coupled with the at least one processor and storing processor-readable code that, when executed by the at least one processor, is configured to: determine, according to a line-of-sight (LOS) probability model, LOS probability map parameters for an LOS probability map region associated with a transmission/reception point (TRP) of the RAN; send the LOS probability map parameters to a user equipment (UE) in the RAN; receive, from the UE, feedback associated with the LOS probability map region; and train the LOS probability model based on the feedback.

32. The apparatus of claim 31, wherein the LOS probability map parameters include vertex coordinates of the LOS probability map region.

33. The apparatus of claim 31, wherein the LOS probability map parameters include a probability function for the LOS probability map region.

34. The apparatus of claim 33, wherein the at least one memory storing processor-readable code that, when executed by the at least one processor, is configured to update the probability function based on the feedback.

35. The apparatus of claim 34, wherein the feedback indicates: a location within the LOS probability map region; and an LOS probability estimate for the location.

36. The apparatus of claim 31, wherein the feedback includes multipath information associated with a positioning reference signal (PRS) transmitted by the TRP.

37. The apparatus of claim 31, wherein the at least one memory storing processor-readable code that, when executed by the at least one processor, is configured to: determine a coarse location estimate for the UE; identify the LOS probability map region based on the coarse location estimate for the UE; and send the LOS probability map parameters for the LOS probability map region to the UE responsive to identifying the LOS probability map region.

38. The apparatus of claim 31, wherein the at least one memory storing processor-readable code that, when executed by the at least one processor, is configured to: receive assistance data from the UE; and train the LOS probability model based on the assistance data and the feedback.

39. The apparatus of claim 38, wherein the at least one memory storing processor-readable code that, when executed by the at least one processor, is configured to: initiate a learning period for the LOS probability model; and receive the assistance data from the UE during the learning period.

40. The apparatus of claim 38, wherein the assistance data includes at least one of: a port identifier (ID); a panel ID; beamforming information; UE orientation information; a receive-transmit (Rx-Tx) turn-around time; and group delay information.

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edspap.20240057018