In-Vehicle Ethernet PHY Interrupt Data Insertion
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Solution Overview
Problem
In-vehicle Ethernet communication devices using 100BaseT1 protocol face inefficiencies due to unused inter-frame gaps, which result in suboptimal utilization of the 100 Mbps communication band.
Innovation Solution
An in-vehicle communication device and method that inserts interrupt data into the inter-frame gap between Ethernet frames, allowing for communication utilizing this region while ensuring a predetermined communication band by using a control circuit to generate transmission data and a PHY unit to convert and transmit this data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If interrupt data is inserted into the inter-frame gap, then communication efficiency is improved by utilizing previously unused bandwidth, but the risk of link disconnection increases when the inter-frame gap is intermittently absent
Solution Approach 1:
The system dynamically adjusts inter-frame gap settings based on communication conditions. When interrupt data transmission is successful, the inter-frame gap is maintained at a minimum value to maximize bandwidth utilization. When link disconnection risks are detected or interrupt data cannot be transmitted, the inter-frame gap is increased to ensure stable link operation, thereby adapting to changing communication requirements
Solution Approach 2:
The patent changes the inter-frame gap parameter from a fixed value to a variable parameter that can be adjusted between minimum and maximum values. This allows the system to optimize communication efficiency by using minimum inter-frame gaps when possible, while ensuring link stability by increasing the gap when necessary, thus resolving the contradiction between productivity and reliability
2Speed
If the inter-frame gap is minimized to maximize bandwidth utilization, then communication speed is improved, but the margin for error in transmission timing is reduced
Solution Approach 1:
The system dynamically adjusts the inter-frame gap based on transmission conditions. During normal operation, minimum inter-frame gaps are used to maximize communication speed. When transmission timing issues or errors are detected, the system automatically increases the inter-frame gap to provide sufficient timing margin, thus maintaining both high speed and reliability under different operating conditions
Data Source
AI summary
An in-vehicle communication device for transmitting and receiving a signal by a predetermined communication protocol related to Ethernet® (registered trademark), the in-vehicle communication device comprising: a control circuit configured to generate transmission data including interrupt data inserted into an inter-frame gap between Ethernet frames; and a PHY unit having a communication circuit configured to convert the transmission data generated by the control circuit into a signal and transmit the signal.