CN-122029904-A - Apparatus and method for reference anchor UE for side-link positioning

Abstract

Various aspects of the present disclosure relate to a reference anchor UE for side-uplink positioning of a target UE. The reference anchor may be selected by the target UE or a positioning entity such as a Location Management Function (LMF) or server UE. The target UE may receive an initial anchor UE list, select a set of active anchor UEs from the initial anchor UE list, select a reference anchor UE from the set of active anchor UEs using one or more selection criteria, perform one or more sidelink location measurements with respect to the reference anchor UE, and transmit information of the one or more sidelink location measurements and the reference anchor UE to a position calculation entity.

Inventors

• THOMAS ROBERT R.
• H-N.Cui

Assignees

• 联想（新加坡）私人有限公司

Dates

Publication Date

20260512

Application Date

20241030

Priority Date

20231102

Claims (18)

1. 1. A user equipment, UE, for wireless communication, comprising: At least one memory At least one processor coupled with the at least one memory and configured to cause the UE to: selecting a reference anchor UE from a set of active anchor UEs using one or more selection criteria; performing side-uplink measurements for positioning with respect to the selected reference anchor UE, and One or more of a side-downlink measurement report based at least in part on the performed side-downlink measurement or information associated with the reference anchor UE is transmitted.
2. 2. The UE of claim 1, wherein the at least one processor is further configured to cause the UE to: Receiving anchor UE list A set of active anchor UEs is selected from the list of anchor UEs, Wherein the anchor UE list is received from a server UE or a location management function, LMF, and wherein one or more of the side uplink measurement report or information associated with the reference anchor UE is transmitted to the server UE or the LMF.
3. 3. The UE of claim 2, wherein the anchor UE list is received in a message that serves as a container for carrying a side-uplink positioning protocol SLPP message, or wherein the anchor UE list is received in the SLPP message.
4. 4. The UE of claim 1, wherein the one or more selection criteria include at least one of: a threshold of a side uplink reference signal; A line-of-sight LoS state associated with one or more of each of the UE or at least one active anchor UE of the set of active anchor UEs; a coverage status associated with one or more of each of the UE or at least one active anchor UE of the set of active anchor UEs; A side uplink time difference of arrival, SL-TDoA, measurement is supported by one or more of the UE or each of at least one active anchor UE of the set of active anchor UEs; whether the position of each of at least one active anchor UE in the set of active anchor UEs is available in multiple dimensions, and Public land mobile network, PLMN, information associated with each active anchor UE in the set of active anchor UEs.
5. 5. The UE of claim 1, wherein the at least one processor is further configured to cause the UE to: Ordering each active anchor UE in the active anchor UE list, and Transmitting an indication of the ordered active anchor UEs.
6. 6. The UE of claim 1, wherein the information associated with the reference anchor UE includes an identifier of the reference anchor UE.
7. 7. The UE of claim 1, wherein the information associated with the reference anchor UE includes one or more of: One or more side-uplink reference signal time difference SL-RSTD measurements; An application layer identifier; Temporary mobile subscriber identity TMSI; A source identifier; A destination identifier; Anchor UE identifier The anchor UE identifier is temporarily referenced.
8. 8. The UE of claim 1, wherein the selected reference anchor UE is a first reference anchor UE, and wherein the at least one processor is further configured to cause the UE to: a second reference anchor UE for a side-uplink positioning protocol, SLPP, session is selected as the first reference anchor UE based at least in part on the one or more selection criteria.
9. 9. The UE of claim 8, wherein the at least one processor is further configured to cause the UE to: performing one or more sidelink reference signal time difference SL-RSTD measurements with the first reference anchor UE and the second reference anchor UE, and A report of the SL-RSTD measurements is transmitted with the first reference UE and the second reference UE, wherein the transmitted report associates each SL-RSTD measurement with one or more of the first reference anchor UE or the second reference anchor UE.
10. 10. A processor for wireless communication, comprising: At least one memory A controller coupled with the at least one memory and configured to cause the controller to: selecting a reference anchor UE from a set of active anchor UEs using one or more selection criteria; performing side-uplink measurements for positioning with respect to the selected reference anchor UE, and One or more of a side-downlink measurement report based at least in part on the performed side-downlink measurement or information associated with the reference anchor UE is transmitted.
11. 11. An apparatus for performing a network function, the apparatus comprising: At least one memory At least one processor coupled with the at least one memory and configured to cause the apparatus to: transmitting an initial anchor UE list to the target UE; receiving a set of active anchor UEs from the initial anchor UE list from the target UE; selecting a reference anchor UE from the set of active anchor UEs using one or more selection criteria; receiving side-uplink positioning measurements from the target UE, and The position of the target UE is calculated using the side-uplink positioning measurements.
12. 12. The apparatus of claim 11, wherein a candidate UE list is received from the target UE, and the processor is further configured to cause the apparatus to generate the initial anchor UE list from the candidate UE list.
13. 13. The apparatus of claim 11, wherein the initial anchor UE list is transmitted in a side uplink positioning protocol, SLPP, message.
14. 14. The apparatus of claim 11, wherein the selection criteria is preconfigured in the apparatus.
15. 15. The apparatus of claim 11, wherein the one or more selection criteria include at least one of: a threshold of a side uplink reference signal received by the target UE; Line-of-sight LoS status between the target UE and the corresponding anchor UE; Coverage status; support for side uplink time difference of arrival, SL-TDoA, measurements; whether the position of the corresponding anchor UE in the two-dimensional or three-dimensional position is available, and Public land mobile network, PLMN, information for the respective anchor UE.
16. 16. The apparatus of claim 11, wherein the at least one processor is further configured to cause the apparatus to: and transmitting auxiliary information to the selected reference anchor UE.
17. 17. The apparatus of claim 16, wherein the assistance information includes at least one of a side-uplink positioning reference signal, SL-PRS, resource ID, SL-PRS periodicity, comb size offset, number of symbols, and dedicated SL-PRS and shared resource pool information.
18. 18. The apparatus of claim 16, wherein the location of the target UE is calculated from a set of SL-RSTD measurements, and each of the SL-RSTD measurements is based on a first time-of-arrival measurement between the target UE and the reference anchor UE and a second time-of-arrival measurement between the target UE and an anchor UE from the set of active anchor UEs.

Description

Apparatus and method for reference anchor UE for side-link positioning Technical Field The present disclosure relates to wireless communications, and more particularly to side-uplink positioning of UEs using reference anchors. Background A wireless communication system may include one or more network communication devices, such as base stations, which may otherwise be referred to as enodebs (enbs), next generation nodebs (gnbs), or other suitable terminology. Each network communication device, such as a base station, may support wireless communications for one or more user communication devices, which may be otherwise referred to as User Equipment (UE) or other suitable terminology. In addition, the wireless communication system may support wireless communication across various radio access technologies, including third generation (3G) radio access technologies, fourth generation (4G) radio access technologies, fifth generation (5G) radio access technologies, and other suitable radio access technologies after 5G (e.g., sixth generation (6G)). The introduction of a Sidelink (SL) positioning framework is approved to support different target positioning requirements across different use cases. SL positioning is intended to be applied to various use cases, such as car-to-anything (V2X), public safety, industrial internet of things (IIoT), and business use cases. The purpose of SL positioning is to determine the absolute, relative position of a UE or the distance or direction between a pair of UEs by using various SL positioning methods, such as the SL Round Trip Time (RTT) type method, including single and double sided RTT, SL angle of arrival (AoA), SL-TOA (SL time of arrival), and SL time difference of arrival (TDOA). SL positioning is implemented using side-uplink positioning reference signals (SL-PRS) transmitted over the PC5 (SL) interface and will be supported in multiple coverage scenarios (in-coverage, partial-coverage and out-of-coverage scenarios). SL positioning is also supported for network-based, network-assisted and UE-only operational positioning scenarios. The side-uplink positioning protocol (SLPP) is also designed to support the transmission of all relevant SL positioning messages between the LMF and the UE and between a pair of UEs. TDoA is a mature positioning technique for providing absolute position of one or more UEs and is one of the key supported positioning techniques supported in the side-uplink, also known as SL-TDoA. In order to obtain good positioning performance, the SL-TDoA requires at least 3 anchor nodes, tight synchronization between the anchor nodes (ideally without synchronization errors) and diversified geometrical layout of the anchor nodes. In practice, it is difficult to guarantee these conditions using known techniques. Disclosure of Invention The present disclosure relates to methods, apparatus and systems supporting identification, selection and configuration of reference anchor UEs to support optimized SL-TDoA procedures. Embodiments of the present disclosure provide more accurate and efficient side-link positioning of a target UE. Some implementations of the methods and apparatus described herein may further include a User Equipment (UE) for wireless communication comprising at least one memory, and at least one processor coupled with the at least one memory and configured to cause the UE to select a reference anchor UE from a set of active anchor UEs using one or more selection criteria, perform side-link measurements for positioning relative to the selected reference anchor UE, and transmit one or more of side-link measurement reports based at least in part on the performed side-link measurements or information associated with the reference anchor UE. In some implementations of the methods and apparatus described herein, the at least one processor is further configured to cause the UE to receive an anchor UE list and select a set of active anchor UEs from the anchor UE list, wherein the anchor UE list is received from a server UE or a Location Management Function (LMF), and wherein one or more of the sidelink measurement report or information associated with the reference anchor UE is transmitted to the server UE or the LMF. In some implementations of the methods and apparatus described herein, the anchor UE list is received in a message that serves as a container for carrying a side-uplink positioning protocol (SLPP) message, or the anchor UE list is received in the SLPP message. In some implementations of the methods and apparatus described herein, the one or more selection criteria include at least one of a threshold value of a side-uplink reference signal, a line-of-sight (LoS) state associated with one or more of the UE or each of the at least one active anchor UEs of the set of active anchor UEs, a coverage state associated with one or more of the UE or each of the at least one active anchor UEs of the set of active anchor UEs, a side-uplink time difference