Joint Sidelink RTT Positioning for Accurate UE Location Estimation
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Solution Overview
Problem
Existing wireless communication systems, particularly in the context of 5G, face challenges in accurately determining the position of user equipment (UE) due to limitations in measuring round-trip time (RTT) operations, which are crucial for precise positioning in vehicle-to-everything (V2X) applications.
Innovation Solution
The method involves obtaining multiple RTT measurements between anchor devices and target UEs, including anchor-to-target, target-to-anchor, and target-to-target RTT measurements, to estimate the position of the target UE using these measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single RTT measurement methods are used, then the positioning process is simple, but the positioning accuracy is insufficient
Solution Approach 1:
The patent segments the RTT measurement process into multiple independent measurement operations: anchor-to-target RTT measurements (first and second measurements) and target-to-target RTT measurements (third and fourth measurements). Each measurement operation is performed separately with specific anchor devices and target UEs, allowing the system to accumulate multiple independent data points that improve positioning accuracy through statistical processing while maintaining clear separation of measurement functions.
Solution Approach 2:
The patent merges multiple RTT measurements (first RTT measurement, second RTT measurement, third RTT measurement, and fourth RTT measurement) into a unified positioning calculation process. The location server combines all these measurements to compute the final position estimate of the target UE, leveraging the law of large numbers to reduce measurement errors and improve overall positioning precision.
2Measurement precision
If multiple RTT measurements are obtained from different anchors and targets, then positioning accuracy improves, but the measurement and processing time increases
Solution Approach 1:
The patent performs preliminary RTT measurements between anchor devices and target UEs, as well as between target UEs themselves, before the final positioning calculation is needed. These preliminary measurements (first RTT measurement, second RTT measurement, third RTT measurement, and fourth RTT measurement) are collected and stored, allowing the location server to perform efficient position estimation without requiring real-time repeated measurements during the actual positioning event.
Solution Approach 2:
The patent implements a feedback mechanism where the location server receives multiple RTT measurements from different anchors and targets, processes these measurements to estimate the position of the target UE, and uses this position information to refine subsequent measurements. The feedback loop allows the system to iteratively improve positioning accuracy while reducing the time needed for initial measurements.
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 approach enhances the accuracy of UE positioning by leveraging multiple RTT measurements, improving the precision of V2X applications such as autonomous driving and intelligent transportation systems.
Implementation Method 1
obtaining first one or more anchor-to-target round-trip time (RTT) measurements corresponding to one or more respective RTT operations between a first target user equipment (UE) and first one or more anchor devices
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a device may obtain first one or more anchor-to-target round-trip time (RTT) measurements corresponding to one or more respective RTT operations between a first target user equipment (UE) and first one or more anchor devices. The device may obtain second one or more anchor-to-target RTT measurements corresponding to one or more respective RTT operations between a second target UE and second one or more anchor devices. The device may obtain a target-to-target RTT measurement corresponding to an RTT operation between the first target UE and the second target UE. The device may determine at least a first estimated position of the first target UE based on the first one or more anchor-to-target RTT measurements, the second one or more anchor-to-target RTT measurements, and the target-to-target RTT measurement.