Vehicle Network Node Asymmetric Data Rate Identification
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Solution Overview
Problem
Current Automotive Ethernet technologies face challenges in time synchronization and data transfer rate asymmetry, particularly with low-frequency signal transfer, which can lead to EMC issues and require complex circuit designs to balance.
Innovation Solution
A network node configuration that identifies data transfer rate symmetry by transmitting and receiving messages with timestamps to determine if data rates in transmission and reception directions are equal or unequal, using a communication unit to calculate the data rate ratio and account for latency and clock deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If different data rates are used for transmission and reception directions, then data transfer efficiency is improved, but time synchronization accuracy deteriorates
Solution Approach 1:
The system dynamically adapts data transfer rates for transmission and reception directions based on actual communication needs. The network node can independently set different data rates for each direction, allowing the system to optimize for either throughput or synchronization accuracy depending on the operational context, thus resolving the contradiction between efficiency and precision.
Solution Approach 2:
The invention changes the parameter of data transfer rate from a fixed symmetric value to variable asymmetric values for transmission and reception directions. By adjusting these rate parameters independently, the system can achieve high data transfer efficiency when needed while maintaining acceptable synchronization accuracy through compensating mechanisms.
2Productivity
If parallel transfer with current is used, then data transfer capability is improved, but EMC problems worsen
Solution Approach 1:
The system performs preliminary identification of asymmetric data transfer rates before conducting parallel current transfers. By detecting and compensating for rate asymmetries in advance, the system prevents EMC problems from arising during high-speed data transfer operations, thus enabling improved data transfer capability without suffering from electromagnetic interference issues.
3Measurement precision
If symmetric data rates are maintained, then time synchronization accuracy is improved, but data transfer efficiency deteriorates
Solution Approach 1:
The system dynamically selects between symmetric and asymmetric data rate modes based on operational requirements. When time synchronization accuracy is the priority, symmetric rates are maintained; when data transfer efficiency is more important, asymmetric rates are applied. This dynamic switching resolves the contradiction by allowing the system to optimize for the current operational context.
4Reliability
If complex circuit design is used to balance low-frequency signal transfer, then signal transfer quality is improved, but device complexity worsens
Solution Approach 1:
The invention replaces complex hardware circuit designs with software-based identification and compensation mechanisms. By using computational algorithms to detect and correct asymmetric data transfer rates, the system achieves reliable signal transfer quality without requiring complicated circuitry, thus reducing device complexity while maintaining reliability.
Data Source
AI summary
A first network node for a vehicle communicates with a second network node and identifies a data transfer rate symmetry by: transmitting a first message and storing a first timestamp indicating the transmission time of the first message, transmitting a second message directly after transmitting the first message and storing a second timestamp indicating the transmission time of the second message, receiving a third message and storing a seventh timestamp indicating the transmission time of the third message, receiving a fourth message, which was transmitted after the third message, and storing an eighth timestamp indicating the transmission time of the fourth message. The first computing unit is configured for identifying, a data transfer rate symmetry by means of the first timestamp, the second timestamp, the seventh timestamp, and the eighth timestamp.