UE-Based Positioning Using Distributed Antennas and TDoA
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Solution Overview
Problem
Conventional positioning methods in LTE/NR systems are inadequate for measuring the position of vehicles due to their reliance on downlink time difference of arrival (DL-TDoA) measurements, which result in delayed and unreliable location information, especially as the speed of the user equipment (UE) increases in NR-V2X systems.
Innovation Solution
A UE-based positioning method that measures the time difference of arrival (TDoA) between a positioning vehicle with distributed antennas and an anchor node, using a least-square (LS) approach to determine the absolute position of a reference point, and corrects the absolute position of an ego vehicle by measuring the relative position of adjacent vehicles with high accuracy through sidelink V2X networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional DL-TDoA positioning methods are used in LTE/NR systems, then positioning can be achieved, but the location information becomes delayed and unreliable, especially as UE speed increases in NR-V2X systems
Solution Approach 1:
The patent inverts the conventional DL-TDoA approach by using UL-TDoA measurements where the UE measures the time difference of arrival of downlink reference signals from multiple anchor nodes, and the network calculates the UE position based on these measurements. This inversion enables the UE to perform positioning independently without requiring network-side processing, thereby reducing positioning delay and improving reliability for high-speed V2X applications
Solution Approach 2:
The patent enables the UE to perform positioning autonomously by measuring TDoA values itself using reference signals received from multiple anchor nodes. The UE calculates its own position based on these measurements without requiring continuous network intervention, making the positioning system self-service capable and significantly reducing the time delay associated with network-based positioning methods
2Measurement precision
If network-based positioning is used, then positioning can be performed, but the network processing load increases and positioning accuracy decreases for high-speed vehicles
Solution Approach 1:
The patent extracts the positioning calculation function from the network and transfers it to the UE. By having the UE perform TDoA measurements and position calculations locally, the network's processing burden is significantly reduced, while the UE gains the capability to determine its own position with high accuracy independent of network processing capacity
Solution Approach 2:
The patent inverts the traditional role assignment by having the UE perform positioning calculations rather than the network. This inversion allows the UE to independently determine its position based on TDoA measurements from multiple anchor nodes, thereby reducing network processing complexity while maintaining or improving positioning accuracy for high-speed vehicles
3Measurement precision
If single antenna positioning is used, then the system is simple, but the positioning accuracy is insufficient for distributed antenna vehicles
Solution Approach 1:
The patent segments the antenna system into multiple distributed anchor nodes positioned at different locations within the vehicle. Each anchor node independently transmits reference signals that are measured by the UE, allowing the system to leverage the spatial distribution of multiple antennas to improve positioning accuracy through TDoA measurements without requiring a single complex antenna system
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides more accurate and reliable positioning for vehicles by distributing network processing load and improving distance measurement accuracy between vehicles, enhancing the confidence level of absolute position corrections in sidelink V2X networks.
Implementation Method 1
measuring a time difference of arrival (TDoA) between a positioning vehicle or a network and an anchor node
Implementation Method 2
measuring a time difference of arrival (TDoA) between a positioning vehicle or a network and an anchor node
Data Source
AI summary
The present disclosure relates to a terminal-based positioning method and device and, the terminal-based positioning method performed by a terminal in a wireless communication system, according to one aspect, can comprise the steps of: measuring a time difference of arrival (TDoA) for each distributed antenna on the basis of signals received from an anchor node through a plurality of distributed antennas; setting the relative position for each distributed antenna on the basis of a reference point preset in correspondence with the terminal; and determining an absolute position, which is the position of the reference point, on the basis of the TDoA measured for each distributed antenna and the relative position set for each distributed antenna.