Cluster-Based Vehicle Positioning via Representative PRS Broadcasting
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Solution Overview
Problem
Existing methods for determining the position of vehicles in vehicle platooning or autonomous trucking require all vehicles to broadcast positioning reference signals (PRS), leading to inefficiencies and increased overhead, especially when inter-cluster distances are large.
Innovation Solution
A cluster-based approach where a single representative vehicle in each cluster broadcasts PRS to determine inter-cluster distances, and only initiates intra-cluster PRS broadcasting when the inter-cluster distance falls below a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all vehicles broadcast positioning reference signals (PRS), then accurate intra-cluster positioning is achieved, but transmission overhead and energy consumption increase significantly
Solution Approach 1:
The system segments vehicles into clusters and designates one representative vehicle per cluster to broadcast PRS. This segmentation reduces the total number of PRS transmissions from N vehicles to 1 representative per cluster, significantly reducing overhead while maintaining positioning accuracy for inter-cluster distance determination.
Solution Approach 2:
The representative vehicle performs multiple functions: it represents the entire cluster for inter-cluster positioning by broadcasting PRS, and also serves as a communication hub for receiving instructions from other representatives. This multi-functionality reduces the need for every vehicle to broadcast PRS independently.
2Quantity of substance
If a single representative vehicle broadcasts PRS for the cluster, then transmission overhead is reduced, but positioning accuracy for individual vehicles within cluster may deteriorate
Solution Approach 1:
The system dynamically adjusts PRS broadcasting behavior based on inter-cluster distance. When clusters are far apart, only representatives broadcast PRS for inter-cluster positioning. When clusters approach within threshold distance, all vehicles in the cluster are instructed to broadcast PRS, ensuring accurate intra-cluster positioning when needed.
Solution Approach 2:
The representative vehicle receives feedback about inter-cluster distance from other representative vehicles and adjusts the PRS broadcasting strategy accordingly. This feedback mechanism ensures that PRS broadcasting is activated only when necessary for accurate positioning, optimizing the balance between overhead and accuracy.
3Measurement precision
If PRS broadcasting is continuous, then positioning accuracy is maintained, but energy consumption increases
Solution Approach 1:
Instead of continuous PRS broadcasting, the system implements periodic broadcasting triggered by specific conditions (inter-cluster distance threshold). PRS transmission occurs periodically when needed for positioning updates, rather than continuously, significantly reducing energy consumption while maintaining positioning accuracy when required.
Solution Approach 2:
The system changes the broadcasting parameter (from continuous to conditional/periodic) based on the inter-cluster distance parameter. When distance exceeds the threshold, broadcasting is minimized; when distance falls below the threshold, broadcasting frequency increases. This parameter-based control optimizes energy usage based on actual positioning needs.
Data Source
AI summary
A user equipment in a vehicle (v-UE) may transmit ranging signals, sometimes referred to as physical ranging signals (PRS), via inter-vehicle messages. The vehicle may be designated as a representative of a cluster of vehicles, e.g., in a vehicle platoon, and may broadcast and receive PRS on behalf of the cluster, while no other vehicles in the cluster broadcast PRS. PRS received from single representative vehicle in a separate cluster may be used to determine the inter-cluster distance between the two clusters. If the inter-cluster distance falls below a predetermined threshold, the v-UE may instruct all other vehicles in its cluster to begin broadcasting PRS, so that each vehicle can determine its distance to all other vehicles. Accordingly, the overhead due to broadcast PRS may be minimized until, e.g., accurate positioning between vehicles is warranted.