Positioning with geographically-similar anchors including a mobile anchor

1. A positioning entity comprising:

a transceiver;

a memory; and

a processor, communicatively coupled to the transceiver and the memory, configured to:

identify a plurality of anchor devices of an anchor group, including a first UE (user equipment), based on a geographic similarity of the plurality of anchor devices, each of the plurality of anchor devices being capable of exchanging PRS (positioning reference signal(s)) with a second UE; and

transmit an anchor group message via the transceiver to the second UE, the anchor group message identifying the plurality of anchor devices and indicating a transient property of the anchor group, the transient property of the anchor group being a mobility status of at least the first UE.

2. The positioning entity of claim 1 , wherein the mobility status indicates whether the first UE is presently in motion.

3. The positioning entity of claim 1 , wherein the mobility status indicates which of the plurality of anchor devices of the anchor group are presently stationary.

4. The positioning entity of claim 1 , wherein the processor is further configured to:

receive updated locations of the plurality of anchor devices of the anchor group; and

at least one of:

determine whether to modify membership of the anchor group based on the updated locations; or

determine an updated transient property of the anchor group based on the updated locations and transmit the updated transient property via the transceiver to the second UE; or

terminate the anchor group based on the updated locations.

5. A positioning entity comprising:

a transceiver;

a memory; and

a processor, communicatively coupled to the transceiver and the memory, configured to:

identify a plurality of anchor devices of an anchor group, including a first UE (user equipment), based on a geographic similarity of the plurality of anchor devices, each of the plurality of anchor devices being capable of exchanging PRS (positioning reference signal(s)) with a second UE; and

transmit an anchor group message via the transceiver to the second UE, the anchor group message identifying the plurality of anchor devices and indicating a transient property of the anchor group;

wherein the transient property of the anchor group is an expiration time of the anchor group; and

wherein the processor is configured to determine the expiration time of the anchor group based on motion of the first UE relative to another member of the anchor group.

6. The positioning entity of claim 5 , wherein the processor is configured to determine the expiration time of the anchor group based on a predicted time that the first UE and the other member of the anchor group will fail to meet at least one criterion for being considered to be geographically similar.

7. A positioning method comprising:

identifying a plurality of anchor devices of an anchor group, including a first UE (user equipment), based on a geographic similarity of the plurality of anchor devices, each of the plurality of anchor devices being capable of exchanging PRS (positioning reference signal(s)) with a second UE; and

transmitting an anchor group message to the second UE, the anchor group message identifying the plurality of anchor devices and indicating a transient property of the anchor group, the transient property of the anchor group being a mobility status of at least the first UE.

8. The method of claim 7 , wherein the mobility status indicates whether the first UE is presently in motion.

9. The method of claim 7 , wherein the mobility status indicates which of the plurality of anchor devices of the anchor group are presently stationary.

10. The positioning method of claim 7 , further comprising:

receiving updated locations of the plurality of anchor devices of the anchor group; and

at least one of:

determining whether to modify membership of the anchor group based on the updated locations; or

determining an updated transient property of the anchor group based on the updated locations and transmitting the updated transient property to the second UE; or

terminating the anchor group based on the updated locations.

11. A positioning method comprising:

identifying a plurality of anchor devices of an anchor group, including a first UE (user equipment), based on a geographic similarity of the plurality of anchor devices, each of the plurality of anchor devices being capable of exchanging PRS (positioning reference signal(s)) with a second UE;

transmitting an anchor group message to the second UE, the anchor group message identifying the plurality of anchor devices and indicating a transient property of the anchor group, the transient property of the anchor group being an expiration time of the anchor group; and

determining the expiration time of the anchor group based on motion of the first UE relative to an other member of the anchor group.

12. The method of claim 11 , wherein determining the expiration time comprises determining the expiration time of the anchor group based on a predicted time that the first UE and the other member of the anchor group will fail to meet at least one criterion for being considered to be geographically similar.

13. A first UE (user equipment) comprising:

a transceiver;

a memory; and

a processor, communicatively coupled to the transceiver and the memory, configured to:

receive an anchor group message via the transceiver from a positioning entity, the anchor group message identifying a plurality of anchor devices of an anchor group including a second UE, each of the plurality of anchor devices being capable of exchanging PRS (positioning reference signal(s)) with the first UE, and the anchor group message indicating a transient property of the anchor group;

receive a plurality of PRS from the plurality of anchor devices;

measure one or more of the plurality of PRS to determine one or more PRS measurements; and

transmit, via the transceiver to a network entity, a positioning measurement report including the one or more PRS measurements based on the transient property of the anchor group, the transient property of the anchor group being a mobility status of at least the second UE.

14. The first UE of claim 13 , wherein the processor is configured to transmit the positioning measurement report including the one or more PRS measurements based on relative mobility of each of the plurality of anchor devices according to a priority protocol indicated in a priority message received via the transceiver.

15. The first UE of claim 13 , wherein the processor is configured to make the one or more PRS measurements based on relative mobility of each of the plurality of anchor devices.

16. A first UE (user equipment) comprising:

a transceiver;

a memory; and

a processor, communicatively coupled to the transceiver and the memory, configured to:

receive an anchor group message via the transceiver from a positioning entity, the anchor group message identifying a plurality of anchor devices of an anchor group including a second UE, each of the plurality of anchor devices being capable of exchanging PRS (positioning reference signal(s)) with the first UE, and the anchor group message indicating a transient property of the anchor group;

receive a plurality of PRS from the plurality of anchor devices;

measure one or more of the plurality of PRS to determine one or more PRS measurements; and

transmit, via the transceiver to a network entity, a positioning measurement report including the one or more PRS measurements based on the transient property of the anchor group;

wherein the one or more PRS measurements comprise two or more PRS measurements, and wherein the processor is further configured to:

determine a baseline measurement of the two or more PRS measurements based on relative mobility of each of the plurality of anchor devices corresponding to the two or more PRS measurements; and

transmit the positioning measurement report with a first of the two or more PRS measurements being the baseline measurement and a second of the two or more PRS measurements being a differential measurement relative to the baseline measurement.

17. The first UE of claim 16 , wherein the baseline measurement is of a first PRS, of the plurality of PRS, corresponding to a first anchor device of the plurality of anchor devices, and wherein the processor is configured to determine the baseline measurement based on the first anchor device being stationary.

18. The first UE of claim 16 , wherein the baseline measurement is of a first PRS, of the plurality of PRS, corresponding to a first anchor device of the plurality of anchor devices, and wherein the processor is configured to determine the baseline measurement based on the first anchor device being more stationary than a second anchor device of the plurality of anchor devices corresponding to the differential measurement.

19. A first UE (user equipment) comprising:

a transceiver;

a memory; and

a processor, communicatively coupled to the transceiver and the memory, configured to:

receive an anchor group message via the transceiver from a positioning entity, the anchor group message identifying a plurality of anchor devices of an anchor group including a second UE, each of the plurality of anchor devices being capable of exchanging PRS (positioning reference signal(s)) with the first UE, and the anchor group message indicating a transient property of the anchor group;

receive a plurality of PRS from the plurality of anchor devices;

measure one or more of the plurality of PRS to determine one or more PRS measurements; and

transmit, via the transceiver to a network entity, a positioning measurement report including the one or more PRS measurements based on the transient property of the anchor group;

wherein the transient property is an expiration time and the processor is configured to transmit the positioning measurement report based on lack of passage of the expiration time.

20. A PRS (positioning reference signal(s)) measurement reporting method comprising:

receiving, an anchor group message at a first UE (user equipment) from a positioning entity, the anchor group message identifying a plurality of anchor devices of an anchor group including a second UE, each of the plurality of anchor devices being capable of exchanging PRS with the first UE, and the anchor group message indicating a transient property of the anchor group;

receiving, at the first UE, a plurality of PRS from the plurality of anchor devices;

measuring, at the first UE, one or more of the plurality of PRS to determine one or more PRS measurements; and

transmitting, from the first UE to a network entity, a positioning measurement report including the one or more PRS measurements based on the transient property of the anchor group, the transient property of the anchor group being a mobility status of at least the second UE.

21. The method of claim 20 , wherein transmitting the positioning measurement report comprises transmitting the positioning measurement report including the one or more PRS measurements based on relative mobility of each of the plurality of anchor devices according to a priority protocol indicated in a priority message received by the first UE.

22. The method of claim 20 , wherein measuring one or more of the plurality of PRS comprises measuring one or more of the plurality of PRS based on relative mobility of each of the plurality of anchor devices.

23. A PRS (positioning reference signal(s)) measurement reporting method comprising:

receiving, an anchor group message at a first UE (user equipment) from a positioning entity, the anchor group message identifying a plurality of anchor devices of an anchor group including a second UE, each of the plurality of anchor devices being capable of exchanging PRS with the first UE, and the anchor group message indicating a transient property of the anchor group;

receiving, at the first UE, a plurality of PRS from the plurality of anchor devices;

measuring, at the first UE, one or more of the plurality of PRS to determine one or more PRS measurements; and

transmitting, from the first UE to a network entity, a positioning measurement report including the one or more PRS measurements based on the transient property of the anchor group;

wherein the one or more PRS measurements comprise two or more PRS measurements, wherein the method further comprises determining a baseline measurement of the two or more PRS measurements based on relative mobility of each of the plurality of anchor devices corresponding to the two or more PRS measurements, and transmitting the positioning measurement report comprises transmitting the positioning measurement report with a first of the two or more PRS measurements being the baseline measurement and a second of the two or more PRS measurements being a differential measurement relative to the baseline measurement.

24. The method of claim 23 , wherein the baseline measurement is of a first PRS, of the plurality of PRS, corresponding to a first anchor device of the plurality of anchor devices, and wherein determining the baseline measurement comprises determining the baseline measurement based on the first anchor device being stationary.

25. The method of claim 23 , wherein the baseline measurement is of a first PRS, of the plurality of PRS, corresponding to a first anchor device of the plurality of anchor devices, and wherein determining the baseline measurement comprises determining the baseline measurement based on the first anchor device being more stationary than a second anchor device of the plurality of anchor devices corresponding to the differential measurement.

26. A PRS (positioning reference signal(s)) measurement reporting method comprising:

receiving, an anchor group message at a first UE (user equipment) from a positioning entity, the anchor group message identifying a plurality of anchor devices of an anchor group including a second UE, each of the plurality of anchor devices being capable of exchanging PRS with the first UE, and the anchor group message indicating a transient property of the anchor group;

receiving, at the first UE, a plurality of PRS from the plurality of anchor devices;

measuring, at the first UE, one or more of the plurality of PRS to determine one or more PRS measurements; and

transmitting, from the first UE to a network entity, a positioning measurement report including the one or more PRS measurements based on the transient property of the anchor group;

wherein the transient property is an expiration time and transmitting the positioning measurement report comprises transmitting the positioning measurement report based on lack of passage of the expiration time.