On-demand positioning reference signal (PRS)
Certain aspects of the present disclosure relate to methods and apparatus for on-demand UE positioning. For example a method may include transmitting a request that comprises one or more parameters based on a request configuration, to at least one of a plurality of base stations of a network, to participate in at least one of an uplink UE positioning procedure or a downlink UE positioning procedure, and receiving signaling from the at least one of the plurality of base stations of the network in response to the request.
1. A method for wireless communication by a user equipment (UE) comprising:
transmitting a positioning reference signal (PRS) request, wherein the PRS request indicates parameters comprising a requested comb density of a PRS and a quasi-colocation (QCL) to use; and
performing one or more measurements based on the PRS transmitted in accordance with configuration parameters selected by a network entity based on the parameters indicated in the PRS request.
2. The method of claim 1 , wherein the parameters further indicate resources to use for transmitting the PRS.
3. The method of claim 1 , wherein the parameters further comprise: a periodicity for the PRS, a number of symbols per slot for the PRS, a number of repeated slots for the PRS, a bandwidth (BW) for the PRS, a number of PRS occasions, or any combination thereof.
4. The method of claim 1 , wherein the parameters further comprise one or more beam directions or a positioning accuracy.
5. The method of claim 1 , wherein the PRS request is transmitted via radio resource control (RRC) signaling.
6. The method of claim 1 , wherein the configuration parameters are signaled via a medium access control (MAC) control element (CE), downlink control information (DCI), or both.
7. The method of claim 1 , wherein the configuration parameters are signaled via radio resource control (RRC) signaling.
8. The method of claim 1 , wherein the PRS request indicates to automatically deactivate the PRS.
9. The method of claim 7 , wherein the configuration parameters indicate one or more differences from the parameters requested by the UE.
10. The method of claim 1 , wherein the UE is in an idle mode and the PRS request is transmitted via a physical random access channel (PRACH) sequence associated with a set of PRS configuration parameters.
11. The method of claim 10 , further comprising: receiving the configuration parameters via a response to the PRACH sequence transmission.
12. The method of claim 11 , wherein the response initiates at least one of:
the PRS; or
an exchange of subsequent random access channel (RACH) messages.
13. The method of claim 1 , further comprising:
transmitting a request to deactivate the PRS.
14. A method for wireless communication by a network entity, comprising:
receiving a positioning reference signal (PRS) request, from a user equipment (UE), wherein the PRS request indicates parameters comprising a request comb density of a PRS and a quasi-colocation (QCL) to use; and
transmitting the PRS based on configuration parameters selected by the network entity based on the parameters indicated in the PRS request.
15. The method of claim 14 , wherein the parameters further indicate resources to use for transmitting the PRS.
16. The method of claim 14 , wherein the parameters further comprise: a periodicity for the PRS, a number of symbols per slot for the PRS, a number of repeated slots for the PRS, a bandwidth (BW) for the PRS, a number of PRS occasions, or any combination thereof.
17. The method of claim 14 , wherein the parameters further comprise one or more beam directions or a positioning accuracy.
18. The method of claim 14 , wherein the PRS request is received via radio resource control (RRC) signaling.
19. The method of claim 14 , wherein the configuration parameters are signaled via a medium access control (MAC) control element (CE), downlink control information (DCI), or both.
20. The method of claim 14 , wherein the configuration parameters are signaled via radio resource control (RRC) signaling.
21. The method of claim 14 , wherein the PRS request indicates to automatically deactivate the PRS.
22. The method of claim 20 , wherein the configuration parameters indicate one or more differences from the parameters requested by the UE.
23. The method of claim 14 , further comprising:
receiving a deactivation request for deactivating the PRS.
24. An apparatus for wireless communication by a user equipment (UE), comprising:
means for transmitting a positioning reference signal (PRS) request, wherein the PRS request indicates parameters comprising a requested comb density of a PRS and a quasi-colocation (QCL) to use; and
means for performing one or more measurements based on the PRS transmitted in accordance with configuration parameters selected by a network entity based on the parameters indicated in the PRS request.
25. An apparatus for wireless communication by a network entity, comprising:
means for receiving a positioning reference signal (PRS) request, from a user equipment (UE), wherein the PRS request indicates parameters comprising a request comb density of a PRS and a quasi-colocation (QCL) to use; and
means for transmitting the PRS based on configuration parameters selected by the network entity based on the parameters indicated in the PRS request.
26. An apparatus for wireless communication by a user equipment (UE) comprising:
a memory comprising instructions;
one or more transceivers;
one or more processors operably coupled to the one or more transceivers and the memory, the one or more processors configured, individually or in any combination, to execute the instructions and cause the apparatus to:
transmit a positioning reference signal (PRS) request, wherein the PRS request indicates parameters comprises a requested comb density of a PRS and a quasi-colocation (QCL) to use; and
perform one or more measurements based on the PRS transmitted in accordance with configuration parameters selected by a network entity based on the parameters indicated in the PRS request.
27. The apparatus of claim 26 , wherein the parameters further indicate resources to use to transmit the PRS.
28. The apparatus of claim 26 , wherein the parameters further comprise: a periodicity for the PRS, a number of symbols per slot for the PRS, a number of repeated slots for the PRS, a bandwidth (BW) for the PRS, a number of PRS occasions, or any combination thereof.
29. The apparatus of claim 26 , wherein the parameters further comprise one or more beam directions or a positioning accuracy.
30. The apparatus of claim 26 , wherein the PRS request is transmitted via radio resource control (RRC) signaling.
31. The apparatus of claim 26 , wherein the configuration parameters are signaled via a medium access control (MAC) control element (CE), downlink control information (DCI), or both.
32. The apparatus of claim 26 , wherein the configuration parameters are signaled via radio resource control (RRC) signaling.
33. The apparatus of claim 26 , wherein the PRS request indicates to automatically deactivate PRS transmission.
34. The apparatus of claim 26 , wherein the configuration parameters indicate one or more differences from the parameters requested by the UE.
35. The apparatus of claim 26 , where the UE is in an idle mode and the PRS request is transmitted via a physical random access channel (PRACH) sequence associated with a set of PRS configuration parameters.
36. The apparatus of claim 35 , wherein the one or more processors are configured, individually or in any combination, to execute the instructions and cause the apparatus to: receive the configuration parameters via a response to the PRACH sequence.
37. The apparatus of claim 26 , wherein the one or more processors are configured, individually or in any combination, to execute the instructions and cause the apparatus to transmit a request to deactivate the PRS.
38. An apparatus for wireless communication, comprising:
a memory comprising instructions;
one or more transceivers;
one or more processors operably coupled to the one or more transceivers and the memory, the one or more processors configured, individually or in any combination, to execute the instructions and cause the apparatus to:
receive a positioning reference signal (PRS) request, wherein the PRS request indicates parameters comprising a requested comb density of a PRS and a quasi-colocation (QCL) to use; and
transmit the PRS based on configuration parameters selected by the apparatus based on the parameters indicated in the PRS request.
39. The apparatus of claim 38 , wherein the parameters indicate resources to use to transmit the PRS.
40. The apparatus of claim 38 , wherein the parameters further comprise: a periodicity for the PRS, a number of symbols per slot for the PRS, a number of repeated slots for the PRS, a bandwidth (BW) for the PRS, a number of PRS occasions, or any combination thereof.
41. The apparatus of claim 38 , wherein the parameters further comprise one or more beam directions or a positioning accuracy.
42. The apparatus of claim 38 , wherein the PRS request is received via radio resource control (RRC) signaling.
43. The apparatus of claim 38 , wherein the configuration parameters are signaled via a medium access control (MAC) control element (CE), downlink control information (DCI), or both.
44. The apparatus of claim 38 , wherein the configuration parameters are signaled via radio resource control (RRC) signaling.
45. The apparatus of claim 38 , wherein the PRS request indicates to automatically deactivate the PRS.
46. The apparatus of claim 44 , wherein the configuration parameters indicate one or more differences from the parameters requested by the UE.
47. The apparatus of claim 38 , wherein the one or more processors are configured, individually or in any combination, to execute the instructions and cause the apparatus to:
receive a deactivation request to deactivate the PRS.