Sidelink Synchronization Source Identification for Accurate Positioning
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Solution Overview
Problem
Existing sidelink positioning technologies face challenges in accurately determining synchronization sources, leading to positioning performance degradation due to synchronization offsets between devices, especially in out-of-coverage scenarios where UEs synchronize to different sources without clear identification.
Innovation Solution
A method for terminal devices to receive and transmit information about sidelink synchronization sources, enabling accurate determination of their synchronization sources and offsets, allowing for correction of SL RSTD measurements through explicit synchronization source identification and offset mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs synchronize to different sidelink synchronization sources without clear identification, then device connectivity is maintained, but positioning accuracy degrades due to synchronization offsets
Solution Approach 1:
The patent introduces synchronization source identification information as an intermediary element that mediates between the synchronization sources and the terminal device. This intermediary carries explicit identification data about the synchronization source, allowing the terminal to accurately determine which source it is synchronized to and apply appropriate offset corrections, thereby resolving the contradiction between maintaining connection and achieving positioning accuracy.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal device receives synchronization source identification information from supporting terminal devices and uses this feedback to correct positioning measurements. The feedback loop allows the terminal to continuously update its knowledge of synchronization sources and apply real-time offset corrections, improving positioning accuracy while maintaining reliable connections.
2Measurement precision
If explicit synchronization source identification is implemented, then positioning accuracy is improved, but message overhead increases
Solution Approach 1:
The patent applies local quality by providing synchronization source identification information only where needed - specifically in messages related to sidelink positioning operations. Rather than broadcasting this information universally, the patent embeds the identification data locally in positioning-related signaling, minimizing overall system overhead while maintaining positioning accuracy for affected terminals.
Solution Approach 2:
The patent segments the synchronization source identification information into discrete, manageable components that can be transmitted efficiently. By breaking down the identification data into specific fields within existing message structures, the patent reduces the incremental overhead while still providing sufficient information for accurate positioning calculations.
3Measurement precision
If synchronization offset correction is applied, then SL-TDOA measurement precision is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the terminal device pre-determine and store synchronization source identification information before positioning measurements are taken. The terminal proactively acquires and caches the necessary synchronization data, so that when positioning measurements occur, the correction calculations can be performed efficiently without adding real-time complexity to the measurement process itself.
Data Source
AI summary
A terminal device including at least one processor; and at least one memory including computer program code; wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the terminal device at least to: receive, from a plurality of supporting terminal devices, information indicative of corresponding sidelink synchronization sources to which each of the plurality of supporting terminal devices is synchronized; and obtain a position of the terminal device, which is based on the indicated information of the corresponding sidelink synchronization sources.