Sidelink PRS Timing Synchronization Using RSTD for UE Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently utilizing sidelink (SL) positioning reference signals (PRS) for accurate positioning in V2X communication, particularly in scenarios requiring enhanced mobile broadband, massive Machine Type Communication (MTC), and Ultra-Reliable and Low Latency Communication (URLLC), due to complexities in timing and distance measurements between user equipment (UEs).
Innovation Solution
A method and device for performing wireless communication that involves obtaining and processing SL PRS resources, receiving PRS from multiple devices within an SL positioning group, calculating reference signal time difference (RSTD) values, and using these to perform precise positioning based on synchronized time intervals and distance measurements among UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL PRS resources are used for positioning in V2X communication, then positioning accuracy is improved, but timing and distance measurement complexity increases
Solution Approach 1:
The patent segments the positioning measurement process into distinct phases: obtaining SL PRS resources from multiple UEs, measuring RSTD values for each UE pair, calculating distance values based on time intervals, and finally determining position. This segmentation simplifies the overall complexity by breaking down the complex positioning task into manageable measurement and calculation steps.
Solution Approach 2:
The patent performs preliminary actions by first obtaining SL PRS resources and configuring timing relationships before actual positioning measurements. The system pre-establishes time intervals between PRS transmissions from different UEs and pre-calculates expected RSTD values, which simplifies the subsequent measurement process and reduces real-time computational complexity.
2Reliability
If multiple PRS signals are received from different UEs for positioning, then positioning reliability is improved, but measurement time and processing delay increase
Solution Approach 1:
The patent implements periodic action by having multiple UEs transmit SL PRS signals at regularly spaced time intervals. This periodic transmission pattern allows the target UE to efficiently measure RSTD values across multiple signal pairs without continuous processing, reducing overall measurement time while maintaining reliability through multiple measurements.
Solution Approach 2:
The system enables self-service by allowing each UE to autonomously measure RSTD values against reference UEs and calculate its own position without requiring centralized coordination for each measurement. This distributed self-measurement approach reduces processing delays compared to centralized processing while maintaining positioning reliability.
3Measurement precision
If synchronized PRS transmission timing is implemented across UEs, then positioning precision is improved, but system coordination complexity increases
Solution Approach 1:
The patent applies universality by using a common reference UE that serves all other UEs in the positioning group. This single reference UE provides a universal timing reference for RSTD measurements, simplifying synchronization coordination compared to requiring pairwise synchronization between all UE pairs while maintaining high measurement precision.
Solution Approach 2:
The reference UE acts as an intermediary that mediates timing synchronization between multiple UEs. Instead of requiring direct coordination between all UE pairs, the reference UE provides a central timing reference that all other UEs can measure against, reducing system coordination complexity while maintaining RSTD measurement precision.
Data Source
AI summary
A method of operating a first device 100 in a wireless communication system is proposed. The method may comprise: obtaining information related to an SL PRS resource; receiving a first PRS at a first time point, based on the SL PRS resource; receiving a second PRS at a second time point, based on the SL PRS resource; receiving, a first distance value between the second device 200 and the third device 300; obtaining a first RSTD value between the second device 200 and the third device 300; and performing the positioning based on the first RSTD value.