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US-20260129604-A1 - METHODS AND SYSTEMS FOR POSITIONING GROUP MONITORING AND MAINTENANCE

US20260129604A1US 20260129604 A1US20260129604 A1US 20260129604A1US-20260129604-A1

Abstract

A target wireless transmit/receive unit (WTRU) may receive a first sidelink positioning reference signal (SL-PRS) from an anchor WTRU. The target WTRU may determine a signal quality of the first SL-PRS. The target WTRU may transmit a second SL-PRS to the anchor WTRU. The target WTRU may receive a SL-PRS measurement report from the anchor WTRU. The SL-PRS measurement report may be based on the second SL-PRS transmitted to the anchor WTRU. The target WTRU may determine that the anchor WTRU is suitable for sidelink link-based positioning, for example based on the signal quality of the first SL-PRS and/or the SL-PRS measurement report received from the anchor WTRU. The target WTRU may determine a position of the target WTRU using the anchor WTRU.

Inventors

  • Tuong Hoang
  • Fumihiro Hasegawa
  • Tao Deng
  • Paul Marinier
  • Moon Il Lee
  • Jaya Rao
  • Kunjan Shah

Assignees

  • INTERDIGITAL PATENT HOLDINGS, INC.

Dates

Publication Date
20260507
Application Date
20231101

Claims (20)

  1. 1 - 20 . (canceled)
  2. 21 . A first wireless transmit/receive unit (WTRU) comprising: a processor configured to: receive a first sidelink positioning reference signal (SL-PRS) from a second WTRU; determine a signal quality of the first SL-PRS; transmit a second SL-PRS to the second WTRU; receive a SL-PRS measurement report from the second WTRU, the SL-PRS measurement report based on the second SL-PRS transmitted to the second WTRU; determine that the second WTRU is suitable for sidelink link-based positioning based on the signal quality of the first SL-PRS and the SL-PRS measurement report received from the second WTRU; and determine a position of the first WTRU using the second WTRU.
  3. 22 . The first WTRU of claim 21 , wherein the processor is configured to determine that the second WTRU is suitable for sidelink link-based positioning when the signal quality of the first SL-PRS is greater than a first threshold and the SL-PRS measurement report indicates that a signal quality of the second SL-PRS transmitted to the second WTRU is greater than a second threshold.
  4. 23 . The first WTRU of claim 22 , wherein the first threshold or the second threshold is in a predetermined range.
  5. 24 . The first WTRU of claim 21 , wherein the processor is configured to: determine that the second WTRU is unsuitable for link-based positioning for a number of consecutive periods; transmit a link persistently unusable for sidelink positioning (LPUSP) indication based on the number of consecutive periods exceeding a third threshold; and stop a sidelink positioning session with the second WTRU.
  6. 25 . The first WTRU of claim 24 , wherein, during each period of the number of consecutive periods, the processor is configured to receive the first SL-PRS, transmit the second SL-PRS, and receive the SL-PRS measurement report.
  7. 26 . The first WTRU of claim 24 , wherein the LPUSP is transmitted to the second WTRU or a location management function (LMF).
  8. 27 . The first WTRU of claim 21 , wherein the processor is configured to determine that the second WTRU is unsuitable for link-based positioning when one or more of the signal quality of the first SL-PRS is less than a first threshold, the SL-PRS measurement report indicates that a signal quality of the second SL-PRS transmitted to the second WTRU is less than a second threshold, the second SL-PRS is not transmitted to the second WTRU, the first SL-PRS from second WTRU is not received, or the SL-PRS measurement report is not received.
  9. 28 . The first WTRU of claim 21 , wherein the signal quality of the first SL-PRS comprises a line of sight (LOS) value or a non-line of sight (NLOS) value.
  10. 29 . The first WTRU of claim 21 , wherein the processor is configured to receive an indication to perform sidelink positioning monitoring.
  11. 30 . The first WTRU of claim 21 , wherein the processor is configured to transmit an indication to perform sidelink positioning monitoring to a third WTRU.
  12. 31 . A method performed by a first wireless transmit/receive unit (WTRU, the method comprising: receiving a first sidelink positioning reference signal (SL-PRS) from a second WTRU; determining a signal quality of the first SL-PRS; transmitting a second SL-PRS to the second WTRU; receiving a SL-PRS measurement report from the second WTRU, the SL-PRS measurement report based on the second SL-PRS transmitted to the second WTRU; determining that the second WTRU is suitable for sidelink link-based positioning based on the signal quality of the first SL-PRS and the SL-PRS measurement report received from the second WTRU; and determining a position of the first WTRU using the second WTRU.
  13. 32 . The method of claim 31 , further comprising: determining that the second WTRU is suitable for sidelink link-based positioning when the signal quality of the first SL-PRS is greater than a first threshold and the SL-PRS measurement report indicates that a signal quality of the second SL-PRS transmitted to the second WTRU is greater than a second threshold.
  14. 33 . The method of claim 32 , wherein the first threshold or the second threshold is in a predetermined range.
  15. 34 . The method of claim 31 , further comprising: determining that the second WTRU is unsuitable for link-based positioning for a number of consecutive periods; transmitting a link persistently unusable for sidelink positioning (LPUSP) indication based on the number of consecutive periods exceeding a third threshold; and stopping a sidelink positioning session with the second WTRU.
  16. 35 . The method of claim 34 , wherein, during each period of the number of consecutive periods, the method further comprises: receiving the first SL-PRS; transmitting the second SL-PRS; and receiving the SL-PRS measurement report.
  17. 36 . The method of claim 34 , further comprising: transmitting the LPUSP to the second WTRU or a location management function (LMF).
  18. 37 . The method of claim 31 , further comprising: determining that the second WTRU is unsuitable for link-based positioning when one or more of the signal quality of the first SL-PRS is less than a first threshold, the SL-PRS measurement report indicates that a signal quality of the second SL-PRS transmitted to the second WTRU is less than a second threshold, the second SL-PRS is not transmitted to the second WTRU, the first SL-PRS from second WTRU is not received, or the SL-PRS measurement report is not received.
  19. 38 . The method of claim 31 , wherein the signal quality of the first SL-PRS comprises a line of sight (LOS) value or a non-line of sight (NLOS) value.
  20. 39 . The method of claim 31 , further comprising: receiving an indication to perform sidelink positioning monitoring.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Patent Application No. 63/421,853 filed on Nov. 2, 2022, the entire contents of which are incorporated herein by reference. BACKGROUND Mobile communications using wireless communication continue to evolve. More specifically, sidelink communications between devices continues to evolve. In NR V2X, the resource for sidelink transmission/reception may be structured as resource pools. The resource pool may consist of a set of continuous frequency resources repeating in time following a bitmap pattern. A wireless transmit/receive unit (WTRU) may be configured one or multiple resource pool. For in coverage WTRUs, the resource pool can be configured via SIB/RRC. For out of coverage WTRUs, the resource pool can be configured. SUMMARY Systems and methods are disclosed for positioning group monitoring and maintenance. For example, a WTRU may perform link-based sidelink position monitoring. A WTRU may determine which of one or more WTRU performs link-based sidelink position monitoring. In some examples, a determined WTRU may include the WTRU that makes the determination. A WTRU may determine whether or not to initiate a sidelink positioning monitoring procedure. In some embodiments, a WTRU may determine the suitability of a link for sidelink positioning. A WTRU may base the suitability on a received sidelink—positioning reference signal (SL-PRS). In other embodiments, the WTRU may base the suitability of the link for sidelink positioning on a receiving sidelink transmission. The suitability may be based on measurement reporting in some embodiments. The WTRU can evaluate a link based on one or more link quality metrics. The one or more link quality metrics may be selected for link-based sidelink position monitoring. Additionally, or alternatively, the WTRU may determine a time to evaluate the suitability of a link. In some embodiments, the WTRU can trigger one or more sidelink transmissions. The one or more sidelink transmissions can be for sidelink positioning monitoring. In some examples, the WTRU may determine whether or not to formulate a positioning group. Additionally or alternatively, the WTRU may determine whether to monitor a link in a group. The link may be associated with another WTRU. In some embodiments, the WTRU may determine whether one or more positioning group is suitable or is unsuitable for sidelink positioning. The WTRU may determine a time to evaluate the suitability of the one or more positioning group. The WTRU may determine that a link is LPSUP (Link-Persistently Unusable for Sidelink Positioning). Additionally, or alternatively, the WTRU may trigger a LPUSP timer. In some embodiments, the WTRU may determine that a group is Group-Persistently Unusable for Sidelink Positioning (GPUSP). Additionally, or alternatively, the WTRU may trigger a GPUSP timer. In some embodiments, the WTRU may receive an indication from a node for sidelink positioning monitoring. The WTRU may select one or more additional or alternative WTRUs for one or more positioning session. A WTRU may include a processor and a memory. The processor and the memory may be configured to establish a connection with an anchor WTRU for sidelink link-based positioning. The processor and memory may be configured to receive an indication of a positioning method type, determine a link quality metric for the connection between the WTRU and the anchor WTRU based on the positioning method type, determine the suitability of the anchor WTRU for sidelink link-based positioning based on the link quality metric, and determine a position of the WTRU using the anchor WTRU for sidelink link-based positioning. A link quality metric may comprise both a Sidelink Positioning Reference Signal (SL-PRS) reception and a SL-PRS measurement report when the positioning method type is Round Trip Time (RTT)-based. A link quality metric may comprise SL-PRS reception when the positioning method type is Sidelink Positioning Reference Signal Reception (SL-PRS Rx)-based. A link quality metric may comprise the SL-PRS measurement report when the positioning method type is Sidelink Positioning Reference Signal Transmission (SL-PRS Tx)-based. In some embodiments, when a positioning method type is RTT-based, one or more of the memory and processor may be configured to perform one or more of transmitting a sidelink positioning reference signal to the anchor WTRU, receiving a sidelink positioning reference signal from the anchor WTRU, and receiving a SL-PRS measurement report from the anchor WTRU based on the sidelink positioning reference signal transmitted to the anchor WTRU. The link quality metric may comprise, for example, the SL-PRS received from the anchor WTRU and the SL-PRS measurement report. In some embodiments, when a positioning method type is SL-PRS Rx-based, the WTRU may be configured to receive a sidelink positioning reference signal from the anchor WTRU. The link qual