Sidelink-assisted cellular-based positioning

1. A method for wireless communication at a base station, comprising:

receiving positioning information for a first user equipment (UE), the first UE supporting sidelink communications via a sidelink interface with one or more roadside units;

identifying that a second UE is associated with the first UE, the second UE supporting sidelink-assisted positioning, if an association between the first UE and the second UE satisfies a threshold;

selecting a third UE that is associated with the second UE based at least in part on an association between the second UE and the third UE satisfying the threshold, upon determining that the association between the first UE and the second UE fails to satisfy the threshold; and

providing, to a network entity, a message indicating the positioning information for the first UE and identifying the first UE and the second UE or the third UE, depending on if the association between the first UE and the second UE or the association between the second UE and the third UE satisfies the threshold.

2. The method of claim 1 , further comprising:

providing, to the network entity, a signal indicating that the second UE supports the sidelink-assisted positioning.

3. The method of claim 1 , further comprising:

obtaining, from the network entity, a signal indicating a request for the positioning information for the second UE, wherein the message indicating the positioning information is provided to the network entity based at least in part on the request.

4. The method of claim 1 , further comprising:

transmitting, to the second UE, an indication that the second UE is to remain in an idle state during positioning operations based at least in part on the association between the first UE and the second UE satisfying the threshold.

5. The method of claim 1 , further comprising:

receiving a signal from the second UE indicating that the association between the first UE and the second UE fails to satisfy the threshold, wherein the signal identifies the third UE.

6. The method of claim 1 , further comprising:

providing, to the network entity, a signal identifying the third UE and indicating that the third UE is associated with the second UE.

7. The method of claim 1 , further comprising:

refraining from initiating a positioning procedure with the second UE based at least in part on the association with the first UE satisfying the threshold.

8. The method of claim 1 , further comprising:

receiving a signal indicating a positioning accuracy for the first UE, wherein the association satisfying the threshold is based at least in part on the positioning accuracy of the first UE.

9. The method of claim 8 , wherein the signal is received from the second UE, the first UE, a roadside unit (RSU) associated with the first UE, or a combination thereof.

10. The method of claim 1 , wherein the threshold comprises a proximity threshold, a positioning accuracy threshold, a travel threshold, a connection threshold, a shared connection threshold, or any combination thereof.

11. A method for wireless communication at a network entity, comprising:

providing, to a base station, a signal indicating a request for positioning information for a first user equipment (UE);

obtaining a message indicating the positioning information for a second UE that supports sidelink communications via a sidelink interface with one or more roadside units and identifies the first UE and the second UE, if an association between the second UE and the first UE satisfies a threshold;

obtaining a signal indicating that a third UE associated with the first UE and an association between the first UE and the third UE satisfies the threshold if the association between the second UE and the first UE fails to satisfy the threshold; and

determining a position of the first UE based at least in part on the positioning information for the second UE and the association between the second UE and the first UE satisfying the threshold.

12. The method of claim 11 , further comprising:

obtaining a signal indicating that the first UE supports the sidelink-assisted positioning.

13. The method of claim 11 , further comprising:

determining a positioning accuracy associated with the second UE, wherein the association satisfying the threshold is based at least in part on the positioning accuracy of the first UE.

14. The method of claim 11 , wherein the threshold comprises a proximity threshold, a positioning accuracy threshold, a travel threshold, a connection threshold, a shared connection threshold, or any combination thereof.

15. A method for wireless communication at a first user equipment (UE), comprising:

receiving, via a cellular interface, a signal indicating a request for positioning information for the first UE;

receiving the positioning information of a second UE associated with the first UE, the second UE communicating with the first UE via a sidelink interface and the association between the first UE and the second UE satisfying a threshold;

transmitting, to a network entity via a base station, a message indicating the positioning information of the second UE for the first UE, the message identifying the second UE and the first UE;

receiving, via a cellular interface, a second signal indicating a second request for a positioning accuracy;

determining the positioning accuracy of the second UE based at least in part on the association satisfying the threshold; and

transmitting an indication of the positioning accuracy of the second UE for the first UE responsive to the second request.

16. The method of claim 15 , further comprising:

receiving a second signal indicating a positioning accuracy of the second UE, wherein the association satisfying the threshold is based at least in part on the positioning accuracy of the second UE.

17. The method of claim 16 , wherein the signal is received from the second UE, a roadside unit (RSU) associated with the second UE, or a combination thereof.

18. The method of claim 15 , wherein the threshold comprises a proximity threshold, a positioning accuracy threshold, a travel threshold, a connection threshold, a shared connection threshold, or any combination thereof.

19. An apparatus for wireless communication at a first user equipment (UE), comprising:

a processor;

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

receive, via a cellular interface, a signal indicating a request for positioning information for the first UE;

receive the positioning information of a second UE associated with the first UE, the second UE communicating with the first UE via a sidelink interface and the association between the first UE and the second UE satisfying a threshold;

transmit, to a network entity via a base station, a message indicating the positioning information of the second UE for the first UE, the message identifying the second UE and the first UE;

receive, via a cellular interface, a second signal indicating a second request for a positioning accuracy;

determine the positioning accuracy of the second UE based at least in part on the association satisfying the threshold; and

transmit an indication of the positioning accuracy of the second UE for the first UE responsive to the second request.

20. The apparatus of claim 19 , wherein the instructions are further executable by the processor to cause the apparatus to:

receive a second signal indicating a positioning accuracy of the second UE, wherein the association satisfying the threshold is based at least in part on the positioning accuracy of the second UE.

21. The apparatus of claim 20 , wherein the signal is received from the second UE, a roadside unit (RSU) associated with the second UE, or a combination thereof.

22. The apparatus of claim 19 , wherein the threshold comprises a proximity threshold, a positioning accuracy threshold, a travel threshold, a connection threshold, a shared connection threshold, or any combination thereof.