Electronic Horizon Bus Traffic Control Across Mixed Baud Rates
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Solution Overview
Problem
The existing E-Horizon system faces challenges in adapting message sending speed and data volume to the diverse baud rates of different vehicle network segments, leading to potential bus overload and data loss due to mismatched data transmission across buses with varying baud rates.
Innovation Solution
A data traffic control method involving an electronic horizon device generating a traffic notification message with message counts, a bus gateway monitoring load ratios, and performing real-time traffic control by adjusting message types and downsampling to prevent bus overload, ensuring data is forwarded only when the load is within reasonable limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the E-Horizon system matches the message load according to the lowest baud rate bus, then the bus load is controlled within reasonable limits, but devices on network segments with higher baud rates experience data loss in amount and accuracy
Solution Approach 1:
The system dynamically adjusts the message sending rate based on the destination bus's baud rate. The E-Horizon device determines the baud rate of each target bus and adaptively controls the message transmission frequency, transforming from a static single-rate approach to a dynamic multi-rate approach that prevents both overload and data loss
Solution Approach 2:
Different message types (POSITION, PROFILE, SEGMENT, STUB, METADATA) are handled with different transmission strategies tailored to their characteristics and the specific bus they are sent to. Each bus segment receives optimized message streams according to its local baud rate capability, rather than a uniform approach
2Reliability
If the message sending rate is reduced to accommodate lower baud rate buses, then bus overload is prevented, but the real-time transmission capability and data accuracy deteriorate
Solution Approach 1:
The message transmission speed is dynamically adjusted according to the destination bus's baud rate. High-baud-rate buses receive messages at higher speeds to maintain real-time performance, while low-baud-rate buses receive messages at reduced speeds to prevent overload, optimizing both speed and reliability simultaneously
3Device complexity
If a single baud rate is used for matching message load, then the system is simple to implement, but it cannot adapt to the diverse baud rates of different vehicle network segments
Solution Approach 1:
The system implements local optimization for each bus segment by determining the baud rate of each target bus and applying appropriate message rate limits specific to that bus. This localized approach provides adaptability to diverse baud rates without requiring complete system redesign
Solution Approach 2:
The E-Horizon device performs preliminary determination of the baud rate for each target bus before message transmission begins. This advance knowledge allows the system to pre-calculate appropriate message rates and avoid trial-and-error adjustments, managing complexity through proactive planning
Data Source
AI summary
The present disclosure relates to a data traffic control method and system for an electronic horizon bus, the method including: generating, by an electronic horizon device, a traffic notification message according to bus messages, and sending to a bus gateway; and after the bus gateway receives the traffic notification message, determining, according to a load ratio of a target bus, whether forwarding the bus messages directly to the target bus would result in exceeding a reasonable load of the target bus, performing traffic control and then performing forwarding if exceeding, or performing direct forwarding if not exceeding.