Dynamic Transmission Rate Adjustment in Vehicle Ethernet Networks
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Solution Overview
Problem
Existing vehicle network technologies, such as CAN and FlexRay-based networks, fail to support higher transmission rates and system expandability required by enhanced safety and infotainment systems, leading to inefficiencies in energy usage due to fixed data transmission rates regardless of data size.
Innovation Solution
An Ethernet-based vehicle network method where end nodes dynamically adjust transmission rates based on data size by using indicators within frames to determine and adjust transmission rates, incorporating quiet time durations to optimize energy usage and prevent idle mode delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If data is transmitted at a fixed rate regardless of data size, then transmission simplicity is maintained, but energy efficiency deteriorates
Solution Approach 1:
The patent implements dynamic transmission rate adjustment by introducing indicators (first indicator in frame n, second indicator in frame n+1) that signal data size changes between consecutive frames. The transmission rate is dynamically adapted based on whether the data unit size changes, allowing the system to transition from fixed-rate to variable-rate transmission. This resolves the contradiction by making the transmission system adaptive rather than static, improving energy efficiency for small data transmissions while maintaining simplicity through indicator-based control.
2Use of energy by moving object
If LPI mode is used to save energy, then energy consumption is reduced, but transmission rate deteriorates
Solution Approach 1:
The patent changes the transmission rate parameter dynamically based on data size. Instead of using LPI mode which forces a fixed low transmission rate, the system adjusts the transmission rate parameter up or down based on indicators signaling data size changes. This allows the system to maintain high transmission rates when needed (avoiding the rate deterioration of LPI mode) while still reducing energy consumption by using lower rates only when appropriate for small data transmissions.
3Loss of energy
If data is transmitted at regular intervals in LPI mode, then energy saving is achieved, but transmission rate difference increases
Solution Approach 1:
The patent introduces dynamic transmission rate adjustment that responds to data size changes indicated by indicators in the frame structure. Rather than transmitting at fixed regular intervals with a reduced rate (as in LPI mode), the system dynamically adapts the transmission rate based on whether data unit sizes are equal or different between consecutive frames. This dynamic approach achieves energy saving only when appropriate while avoiding the persistent transmission rate reduction of LPI mode.
4Adaptability or versatility
If fixed transmission rate is used, then system simplicity is maintained, but adaptability to different data sizes deteriorates
Solution Approach 1:
The patent implements parameter change capability by introducing indicators that signal when data unit sizes change between consecutive frames. The transmission rate parameter is adjusted based on these indicators, enabling the system to adapt to different data sizes. This provides adaptability through a relatively simple mechanism - using indicators to trigger parameter changes - rather than requiring complex transmission control systems.
Data Source
AI summary
An operation method of a first communication node in an Ethernet-based vehicle network is provided. A frame n is generated including a data unit n, and a first indicator indicating that a size of a data unit n+1 to be transmitted via a frame n+1 after determining that the frame n is different from a size of the data unit n. The frame n is transmitted to a second communication node and the frame n+1 is generated including the data unit n+1. The frame n+1 is then transmitted to the second communication node. The transmission rate of the data unit n is different from the transmission rate of the data unit n+1, and n is a natural number.