Synchronization Reference Alignment for 5G Sidelink Positioning
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Solution Overview
Problem
Sidelink positioning in 5G NR faces challenges in maintaining synchronization among anchor user equipment (UEs), which can lead to degraded positioning accuracy for target UEs due to synchronization misalignment.
Innovation Solution
A server device determines a common synchronization reference source for positioning anchor devices based on information about the role of devices and the quality of links between them, ensuring synchronized sidelink positioning reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If anchor UEs use independent synchronization references, then device complexity is reduced, but positioning accuracy deteriorates due to synchronization misalignment
Solution Approach 1:
The patent introduces a location management function (LMF) as an intermediary that coordinates synchronization reference selection among anchor UEs. The LMF receives synchronization status information from anchor UEs, determines a common synchronization reference source, and provides configuration information to align all anchors to the same reference, thereby resolving the contradiction between independent operation and synchronization accuracy
Solution Approach 2:
The patent changes the synchronization reference parameter from independent local references to a common reference source determined by the LMF. By dynamically adjusting the synchronization reference parameter based on network conditions and anchor UE capabilities, the system achieves both simplified management and high positioning accuracy
2Measurement precision
If a common synchronization reference source is enforced, then positioning accuracy is improved, but device complexity increases due to coordination requirements
Solution Approach 1:
The LMF acts as a centralized mediator that handles the complexity of synchronization coordination. Anchor UEs simply report their synchronization status and receive configuration instructions, eliminating the need for complex peer-to-peer coordination protocols while ensuring common reference alignment
Solution Approach 2:
Anchor UEs autonomously determine their synchronization reference status and report it to the LMF without requiring complex negotiation protocols. The LMF then automatically assigns the common reference source, allowing anchors to self-configure while maintaining centralized coordination
Data Source
AI summary
Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage medium for synchronization reference alignment. In a method, a server device obtains first information indicating at least one of: a role of a device of at least one device during positioning of a target device based on at least sidelink positioning reference signals, or quality of a plurality of links between the device of the at least one device and a plurality of positioning anchor devices for the positioning of the target device. Based on at least the first information, the server device determines a common synchronization reference source for synchronization of at least one of the plurality of positioning anchor devices.