On-Vehicle Switching Device Dynamic Port Selection
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Solution Overview
Problem
In on-vehicle communication systems, the close proximity of noise sources like engines and signal lines within limited vehicle spaces leads to increased noise levels, degrading signal quality and making redundant switching difficult due to the inability of existing methods to effectively detect signal quality degradation.
Innovation Solution
The implementation of a switching system with multiple communication ports and a measurement unit that measures signal quality, allowing for switching between ports based on signal-to-noise ratio (SNR) and temperature criteria, ensuring continuous communication by rerouting through alternative ports when noise levels deteriorate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple communication ports are provided for redundant switching, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic port switching based on real-time signal quality measurements. The switching device monitors reception signal quality of multiple communication ports and automatically switches from a degraded port to a healthier alternative port when quality thresholds are violated. This dynamic adaptation allows the system to maintain reliable communication without requiring complex static redundancy configurations, as the same physical infrastructure can adapt its topology based on environmental conditions.
2Reliability
If signal quality measurement and automatic switching are implemented, then communication quality is maintained, but measurement precision requirements increase
Solution Approach 1:
The patent implements a feedback mechanism where the switching device continuously measures reception signal quality of active communication ports and compares measurements against predetermined thresholds. When the signal quality of the currently active port falls below the threshold, the system triggers a switching operation to an alternative port. This feedback-based approach allows the system to maintain communication quality without requiring extremely precise measurements, as long as the measurements are sufficient to detect degradation trends and trigger appropriate switching decisions.
Data Source
AI summary
An on-vehicle communication system mounted on a vehicle comprises a first switching device, a second switching device and a third switching device each including a first communication port and a second communication port. The first communication port and the second communication port of the first switching device are respectively connected to the first communication port of the second switching device and the first communication port of the third switching device, and the second communication port of the second switching device and the second communication port of the third switching device are connected to each other. Each of the first switching device, the second switching device and the third switching device measures a reception signal quality for the first communication port of the device itself and a reception signal quality for the second communication port of the device itself. One of the first communication port and the second communication port is selected as a port for use which should be used for communication in each of the first switching device, the second switching device and the third switching device. Each of the switching devices performs switching processing for determining whether or not the port for use is to be switched to the another one of the first communication port and the second communication port based on the reception signal quality for the first communication port and the second communication port.