Systems and methods for network procedures for on-demand random access channel (RACH)

1. A method for wireless communication by a user equipment (UE) comprising:

transmitting, by the UE, a request to participate in a UE positioning procedure configured to determine a position of the UE, wherein the request indicates one or more parameters to be used by a location server in coordinating one or more base stations (BSs) to participate in the UE positioning procedure, the one or more parameters indicating a number of symbols per slot for positioning reference signal (PRS) signaling, comb density of a desired PRS, a number of PRS occasions, a periodicity for sending the PRS signaling, a bandwidth (BW) for sending the PRS signaling, or one or more beams for sending the PRS signaling, or a combination thereof for configuring the PRS signaling; and

receiving, by the UE, signaling from the location server configuring the UE to participate in the UE positioning procedure in response to the request.

2. The method of claim 1 , wherein the location server comprises a location management function (LMF).

3. The method of claim 1 , wherein:

the one or more parameters indicate resources to use for the UE positioning procedure; and

the signaling from the location server configuring the UE to participate in the UE positioning procedure comprises a PRS configuration of the one or more BSs.

4. The method of claim 3 , wherein the indicated resources comprise a frequency domain resource or a time domain resource, or a combination thereof.

5. The method of claim 1 , wherein the one or more parameters include a desired positioning accuracy or a desired application for using results of the UE positioning procedure.

6. The method of claim 1 , wherein the one or more parameters indicate a number of repeated slots for the PRS signaling.

7. The method of claim 1 , wherein the one or more parameters are configured to tailor the configuration information according to communication requirements of an application operating on the UE, the configuration information for configuring the PRS signaling at the UE.

8. A method for wireless communication by a network entity comprising:

receiving, from a user equipment (UE), a request to participate in a UE positioning procedure configured to provide the UE with a position of the UE, wherein the request indicates one or more parameters to be used in the UE positioning procedure, the one or more parameters indicating a number of symbols per slot for positioning reference signal (PRS) signaling, comb density of a desired PRS, a number of PRS occasions, a periodicity for sending the PRS signaling, a bandwidth (BW) for sending the PRS signaling, or one or more beams for sending the PRS signaling, or a combination thereof for configuring the PRS signaling;

configuring, in response to the request, one or more base stations (BSs) to participate in the UE positioning procedure with the UE;

transmitting a response to the UE, wherein the response includes configuration information for participating in the UE positioning procedure; and

receiving a positioning measurement report from the UE, the positioning measurement report based on the configuration information obtained from the one or more BSs.

9. The method of claim 8 , wherein:

the network entity is a BS; and

the request from the UE is received via the BS.

10. The method of claim 9 , further comprising:

modifying the request to include configuration information for configuring the PRS signaling; and

transmitting the modified request to a location server.

11. The method of claim 9 , further comprising:

receiving, from a location server, signaling configuring the BS to participate in the UE positioning procedure with the UE; and

participating in the UE positioning procedure in accordance with the signaling.

12. The method of claim 11 , wherein participating comprises communicating, in response to the request, with the one or more BSs or the location server.

13. The method of claim 9 , further comprising transmitting signaling to the UE in response to the request.

14. The method of claim 9 , wherein the BS modifies the request by adding additional configuration information.

15. The method of claim 8 , wherein the request indicates one or more additional parameters to be used by a location server in coordinating with a BS to participate in the UE positioning procedure.

16. A user equipment (UE) comprising:

a processor;

a transceiver communicatively coupled to the processor; and

a memory communicatively coupled to the processor, wherein the processor is configured to cause the UE to:

transmit a request to participate in a UE positioning procedure configured to determine a position of the UE, wherein the request indicates one or more parameters to be used by a location server in coordinating one or more base stations (BSs) to participate in the UE positioning procedure, the one or more parameters indicating a number of symbols per slot for positioning reference signal (PRS) signaling, comb density of a desired PRS, a number of PRS occasions, a periodicity for sending the PRS signaling, a bandwidth (BW) for sending the PRS signaling, or one or more beams for sending the PRS signaling, or a combination thereof for configuring the PRS signaling; and

receive signaling from the location server configuring the UE to participate in the UE positioning procedure in response to the request.

17. The UE of claim 16 , wherein:

the one or more parameters indicate resources to use for the UE positioning procedure; and

the signaling from the location server configuring the UE to participate in the UE positioning procedure comprises a PRS configuration of the one or more BSs.

18. The UE of claim 17 , wherein the indicated resources comprise a frequency domain resource or a time domain resource, or a combination thereof.

19. The UE of claim 16 , wherein the one or more parameters include a desired positioning accuracy or a desired application for using results of the UE positioning procedure.

20. The UE of claim 16 , wherein the one or more parameters indicate a number of repeated slots for the PRS signaling.

21. The UE of claim 16 , wherein the one or more parameters are configured to tailor the configuration information according to communication requirements of an application operating on the UE, the configuration information for configuring the PRS signaling at the UE.

22. A network entity comprising:

a processor;

one or more of a transceiver or a network interface communicatively coupled to the processor; and

a memory communicatively coupled to the processor, wherein the processor is configured to cause the network entity to:

receive, from a user equipment (UE), a request to participate in a UE positioning procedure configured to provide the UE with a position of the UE, wherein the request indicates one or more parameters to be used in the UE positioning procedure, the one or more parameters indicating a number of symbols per slot for positioning reference signal (PRS) signaling, comb density of a desired PRS, a number of PRS occasions, a periodicity for sending the PRS signaling, a bandwidth (BW) for sending the PRS signaling, or one or more beams for sending the PRS signaling, or a combination thereof for configuring the PRS signaling;

configure, in response to the request, one or more base stations (BSs) to participate in the UE positioning procedure with the UE;

transmit a response to the UE, wherein the response includes configuration information for participating in the UE positioning procedure; and

receive a positioning measurement report from the UE, the positioning measurement report based on the configuration information obtained from the one or more BS.

23. The method of claim 1 , further comprising:

receiving a base station almanac (BSA) from the location server or a BS of the one or more BSs; and

determining a position of the UE based at least on the received BSA and the one or more positioning measurements.

24. The method of claim 1 , further comprising:

measuring one or more positioning measurements based on the signaling from the location server; and

determining a position of the UE, based at least on the one or more positioning measurements.

25. The method of claim 1 , further comprising:

measuring one or more positioning measurements based on the signaling from the location server; and

sending at least one of the one or more positioning measurements to the location server.

26. The method of claim 9 , further comprising:

determining a position of the UE based at least on the positioning measurement report; and

transmitting the determined position to the UE.

27. The UE of claim 16 , wherein the processor is further configured to cause the UE to:

measure one or more positioning measurements based on the signaling from the location server; and

determine a position of the UE, based at least on the one or more positioning measurements.

28. The UE of claim 16 , wherein the processor is further configured to cause the UE to:

measure one or more positioning measurements based on the signaling from the location server; and

send at least one of the one or more positioning measurements to the location server.

29. The network entity of claim 22 , wherein the processor is further configured to cause the network entity to:

determine a position of the UE based at least on the positioning measurement report; and

transmit the determined position to the UE.

30. The method of claim 1 , wherein the one or more parameters indicate the comb density of the desired PRS.

31. The method of claim 8 , wherein the one or more parameters indicate the comb density of the desired PRS.

32. The UE of claim 16 , wherein the one or more parameters indicate the comb density of the desired PRS.

33. The network entity of claim 22 , wherein the one or more parameters indicate the comb density of the desired PRS.

34. The method of claim 26 , wherein determining the position of the UE further comprises determining the position of the UE based at least on a base station almanac (BSA) and the positioning measurement report, wherein the BS includes the BS.