Sidelink Anchor UE Selection Using Synchronization Status
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Solution Overview
Problem
In sidelink (SL) positioning scenarios, synchronization misalignment among anchor UEs can lead to degraded positioning accuracy due to the use of lower-cost and lower-processing-capability devices with varying synchronization levels, especially in out-of-coverage conditions, affecting the precision of SL TDOA methods.
Innovation Solution
A method for selecting a set of synchronized anchor UEs by exchanging synchronization status assistance information, allowing target UEs to determine and establish communication with high-accuracy synchronized anchor UEs for precise SL positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lower-cost and lower-processing-capability devices are used for SL positioning, then device cost and complexity are reduced, but synchronization accuracy and positioning precision deteriorate
Solution Approach 1:
The patent applies preliminary action by having anchor UEs exchange synchronization status assistance information before the positioning session starts. This allows the target UE to select synchronized anchor UEs in advance, ensuring synchronization accuracy is established before positioning begins, thus resolving the contradiction between using lower-cost devices and maintaining positioning precision
Solution Approach 2:
The patent implements feedback mechanisms where anchor UEs provide synchronization status assistance information to the target UE. This feedback loop enables the target UE to evaluate and select appropriate synchronized anchor UEs, ensuring that even lower-cost devices can achieve sufficient synchronization accuracy for positioning purposes
2Adaptability or versatility
If anchor UEs with varying synchronization levels are used, then system adaptability and coverage are improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent applies local quality by allowing different anchor UEs to have different synchronization characteristics, but requiring that the selected anchor UEs for a specific positioning session share common synchronization characteristics. This enables system adaptability across diverse devices while ensuring positioning accuracy within the selected synchronized subset
Solution Approach 2:
The patent uses preliminary action by having anchor UEs exchange synchronization status information before the positioning session. This advance evaluation allows the system to adapt to varying synchronization levels by selecting only those anchor UEs that meet the required synchronization criteria, thus maintaining positioning accuracy while preserving system adaptability
3Measurement precision
If synchronization status information exchange is implemented, then positioning precision is improved, but communication overhead and time consumption increase
Solution Approach 1:
The patent applies preliminary action by exchanging synchronization status assistance information before the positioning session starts. This advance preparation ensures that when positioning begins, the target UE already has the information needed to select synchronized anchor UEs, minimizing time delays during the actual positioning operation while maintaining precision
Solution Approach 2:
The patent implements partial action by having anchor UEs exchange only the necessary synchronization status assistance information rather than complete synchronization data. This selective information exchange reduces communication overhead and time consumption while providing sufficient precision for positioning decisions
Data Source
AI summary
Systems, methods, apparatuses, and computer program products for sidelink (SL) synchronization during user equipment (UE) selection. A method may include receiving one or more messages from one or more devices of a selected set of devices. According to certain example embodiments, each of the one or more messages may include synchronization information. The method may also include selecting, based on the synchronization information, at least one device of the selected set of devices for a positioning communication session. The method may further include performing a positioning estimate of the apparatus based on positioning signals received through the positioning communication session from the at least one device of the selected set of devices.