User equipment selection for sidelink-assisted position estimation procedure
Disclosed are techniques for wireless communication. In an aspect, a communications device determines at least one position estimation performance parameter, determines a zone identifier based at least in part upon the at least one position estimation performance parameter, wherein the zone identifier identifies one of a plurality of zones, and transmits the zone identifier to one or more UEs. A UE receives the zone identifier, determines the at least one position estimation performance parameter, selects one or more candidate UEs for the sidelink-assisted position estimation procedure based at least in part upon the at least one position estimation performance parameter, and performs the sidelink-assisted position estimation procedure of the UE with at least the selected one or more candidate UEs.
1 . A method of operating a user equipment (UE), comprising:
receiving a zone identifier identifying one of a plurality of zones;
determining at least one position estimation performance parameter that is associated with the zone identifier;
selecting one or more candidate UEs for a sidelink-assisted position estimation procedure for deriving a location estimate of the UE based at least in part upon the at least one position estimation performance parameter; and
performing the sidelink-assisted position estimation procedure with at least the selected one or more candidate UEs,
wherein the sidelink-assisted position estimation procedure comprises transmission of one or more first reference signals for positioning by the selected one or more candidate UEs and measured by the UE, transmission of one or more second reference signals for positioning by the UE and measured by the selected one or more candidate UEs, or a combination thereof,
wherein the at least one position estimation performance parameter indicates an accuracy of a position estimate of a candidate UE for the sidelink-assisted position estimation procedure, and
wherein the accuracy is indicated via an error variance threshold.
2 . The method of claim 1 , wherein the plurality of zones is associated with different geographical sizes.
3 . The method of claim 2 , wherein a respective geographical size of the zone identified by the zone identifier is based on the indicated accuracy of the position estimate.
4 . The method of claim 1 , wherein the at least one position estimation performance parameter indicates one of a plurality of position estimation accuracy tiers.
5 . The method of claim 4 , wherein the plurality of position estimation accuracy tiers includes a highest accuracy tier associated with anchor UEs, a lowest accuracy tier associated with UEs without a known position estimate, and one or more intervening accuracy tiers between the lowest accuracy tier and the highest accuracy tier.
6 . The method of claim 1 ,
wherein the accuracy is further indicated in an x direction, a y direction, a z direction, or a combination thereof.
7 . The method of claim 1 , wherein the zone identifier includes a first part that identifies the zone and a second part that indicates the at least one position estimation performance parameter.
8 . The method of claim 1 , wherein the at least one position estimation performance parameter indicates a synchronization error class of a candidate UE for the sidelink-assisted position estimation procedure.
9 . The method of claim 8 , wherein the selection is biased so as to select candidate UEs in the same synchronization error class as the UE.
10 . The method of claim 8 , wherein the synchronization error class indicates a timing synchronization error associated with the candidate UE, a frequency synchronization error associated with the candidate UE, or a combination thereof.
11 . The method of claim 1 , wherein the at least one position estimation performance parameter is determined based on one or more predetermined computational rules applied by the UE to at least part of the zone identifier.
12 . The method of claim 1 , wherein the at least one position estimation performance parameter is encoded in the zone identifier.
13 . A user equipment (UE), comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
receive, via the at least one transceiver, a zone identifier identifying one of a plurality of zones;
determine at least one position estimation performance parameter that is associated with the zone identifier;
select one or more candidate UEs for a sidelink-assisted position estimation procedure for deriving a location estimate of the UE based at least in part upon the at least one position estimation performance parameter; and
perform the sidelink-assisted position estimation procedure with at least the selected one or more candidate UEs,
wherein the sidelink-assisted position estimation procedure comprises transmission of one or more first reference signals for positioning by the selected one or more candidate UEs and measured by the UE, transmission of one or more second reference signals for positioning by the UE and measured by the selected one or more candidate UEs, or a combination thereof,
wherein the at least one position estimation performance parameter indicates an accuracy of a position estimate of a candidate UE for the sidelink-assisted position estimation procedure, and
wherein the accuracy is indicated via an error variance threshold.
14 . The UE of claim 13 , wherein the plurality of zones is associated with different geographical sizes.
15 . The UE of claim 14 , wherein a respective geographical size of the zone identified by the zone identifier is based on the indicated accuracy of the position estimate.
16 . The UE of claim 13 , wherein the at least one position estimation performance parameter indicates one of a plurality of position estimation accuracy tiers.
17 . The UE of claim 16 , wherein the plurality of position estimation accuracy tiers includes a highest accuracy tier associated with anchor UEs, a lowest accuracy tier associated with UEs without a known position estimate, and one or more intervening accuracy tiers between the lowest accuracy tier and the highest accuracy tier.
18 . The UE of claim 13 ,
wherein the accuracy is further indicated in an x direction, a y direction, a z direction, or a combination thereof.
19 . The UE of claim 13 , wherein the zone identifier includes a first part that identifies the zone and a second part that indicates the at least one position estimation performance parameter.
20 . The UE of claim 13 , wherein the at least one position estimation performance parameter indicates a synchronization error class of a candidate UE for the sidelink-assisted position estimation procedure.
21 . The UE of claim 20 , wherein the selection is biased so as to select candidate UEs in the same synchronization error class as the UE.
22 . The UE of claim 20 , wherein the synchronization error class indicates a timing synchronization error associated with the candidate UE, a frequency synchronization error associated with the candidate UE, or a combination thereof.
23 . The UE of claim 13 , wherein the at least one position estimation performance parameter is determined based on one or more predetermined computational rules applied by the UE to at least part of the zone identifier.