Sidelink Positioning Ambiguity Resolution via AoA Reporting
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Solution Overview
Problem
Existing wireless communication systems face challenges in quickly detecting and resolving Time Difference of Arrival (TDoA) positioning ambiguity caused by the topology of anchor nodes in sidelink communication, which affects the accuracy and efficiency of TDoA positioning.
Innovation Solution
A method and device for performing positioning by user equipment (UE) in a wireless communication system supporting sidelink, which involves receiving sidelink control information from multiple anchor nodes, detecting positioning ambiguity based on the positional relationship between these nodes, requesting an angle of arrival (AoA) report from a selected anchor node, and measuring the UE's position using the received AoA report.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If TDoA positioning is performed using multiple anchor nodes in sidelink communication, then positioning coverage is improved, but positioning ambiguity occurs due to anchor node topology
Solution Approach 1:
The patent introduces an intermediary mechanism (AoA report requesting procedure) to resolve the positioning ambiguity caused by anchor node topology. When positioning ambiguity is detected, the UE requests additional AoA information from selected anchor nodes, which serves as intermediary data to disambiguate the position estimate and improve measurement precision while maintaining broad coverage.
2Device complexity
If traditional TDoA positioning procedures are used, then system complexity is maintained, but time consumption for positioning increases
Solution Approach 1:
The patent applies preliminary action by having the UE detect positioning ambiguity and request AoA reports proactively during the positioning procedure. This preliminary detection and request mechanism allows the system to prepare additional measurement data before final position calculation, reducing the overall time consumption without significantly increasing system complexity.
Solution Approach 2:
The patent enables skipping unnecessary waiting time by allowing the UE to request AoA reports from selected anchor nodes based on detected ambiguity, rather than following a fixed sequential procedure. This rushes through the positioning process by obtaining critical additional information faster, minimizing the time loss while maintaining manageable system complexity.
3Measurement precision
If AoA reports are requested from all anchor nodes, then positioning accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by having the UE request AoA reports from only selected anchor nodes based on the detected positioning ambiguity and anchor node topology, rather than from all anchor nodes. This localized approach obtains sufficient additional measurement data to resolve ambiguity and improve positioning accuracy while minimizing the signaling overhead by targeting only the necessary subset of anchor nodes.
Data Source
AI summary
A method and an apparatus for performing positioning by a user equipment (UE) in a wireless communication system supporting a sidelink according to various embodiments are disclosed. Disclosed are a method and an apparatus therefor, the method comprising the steps of: receiving a plurality of pieces of sidelink control information (SCI) including scheduling information of a PRS from a plurality of anchor nodes; receiving a plurality of PRSs on the basis of the plurality of pieces of SCI; on the basis of the positional relationship of the plurality of anchor nodes, detecting ambiguity in position measurement based on the plurality of PRSs; requesting an angle of arrival (AoA) report from one anchor node among the plurality of anchor nodes on the basis of the detected ambiguity in position measurement; and measuring the position of the UE on the basis of the plurality of PRSs and the reported AoA.