Downlink Message Fragmentation for Automated Vehicle Marshaling
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Solution Overview
Problem
Existing automated vehicle marshaling (AVM) technologies face challenges with packet loss during downlink communication between sensing infrastructure controllers and autonomous vehicles, particularly due to increasing packet sizes and distance, which disrupts marshaling and reduces traffic throughput.
Innovation Solution
The method involves segmenting marshaled vehicles into groups based on distance from roadside units and fragmenting messages into smaller packets according to transmission criteria, including distance, number of vehicles, and number of waypoints, to optimize communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the packet size is increased to accommodate more vehicles and waypoints, then the communication coverage is extended, but the packet loss increases
Solution Approach 1:
The patent segments the downlink communication into multiple smaller packets instead of transmitting one large packet containing all vehicle control data. This segmentation reduces the size of individual packets, thereby decreasing packet loss while maintaining comprehensive communication coverage across all marshaled vehicles through sequential packet transmission.
2Manufacturing precision
If the packet size is increased to include more waypoints for sharper maneuvers, then the maneuver control precision is improved, but the packet loss increases
Solution Approach 1:
The patent divides the maneuver control data into separate packets, allowing precise waypoint instructions to be transmitted in smaller units. This enables detailed maneuver control without the packet size becoming excessively large, thereby maintaining both precision and reliability.
3Productivity
If more marshaled vehicles are controlled simultaneously, then the system capacity is increased, but the packet size increases and packet loss increases
Solution Approach 1:
The patent segments the control data for multiple vehicles into smaller packets, enabling the system to manage higher capacity with reduced packet loss. Each packet contains control information for a subset of vehicles, allowing comprehensive control of many vehicles simultaneously without exceeding reliable transmission size limits.
4Length of stationary object
If the distance between the sensing infrastructure controller and automated vehicle increases, then the operational range is extended, but the packet loss increases
Solution Approach 1:
The patent uses packet segmentation to extend operational range by reducing individual packet sizes. Smaller packets are less prone to loss over long distances, enabling reliable communication between the sensing infrastructure controller and vehicles at extended ranges.
Data Source
AI summary
A method of segmenting a plurality of marshaled vehicles into one or more marshaling groups based on a distance each of the marshaled vehicles are from a respective road-side unit of one or more road-side units, fragmenting a message into a plurality of messages based on one or more transmission criteria, and transmitting the plurality of fragmented messages to each marshaled vehicle of the plurality of marshaled vehicles.