Ethernet Vehicle Network Physical Layer State Analysis
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Solution Overview
Problem
Current vehicle network technologies, such as CAN and FlexRay-based networks, fail to meet the higher transmission rate and system expandability requirements for telematics and infotainment systems, and the MOST-based network is costly to implement across all vehicle networks.
Innovation Solution
An Ethernet-based vehicle network method that analyzes the state of the physical layer by transmitting and receiving frames to identify signal-to-noise ratio (SNR) and path loss information, allowing for the setting of communication paths based on predefined quality criteria to ensure reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If MOST-based network is applied to support higher transmission rate, then transmission rate is improved, but cost increases
Solution Approach 1:
The patent applies Ethernet-based network technology which is more cost-effective compared to MOST-based network, achieving high transmission rates without the high cost associated with MOST technology. The Ethernet protocol and physical layer design enable reliable communication at lower implementation costs.
2Reliability
If physical layer state analysis is performed to ensure reliable transmission, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where communication nodes transmit test frames and analyze the state of the physical layer based on received frames. The system continuously monitors physical layer conditions (such as signal quality, noise levels, and transmission errors) and uses this feedback to adjust transmission parameters, select optimal communication paths, and maintain reliable frame transmission.
Solution Approach 2:
The communication nodes perform self-diagnosis and self-optimization by automatically analyzing their own physical layer state through transmitted and received frames. The system independently identifies transmission issues and adjusts its operation without requiring external intervention, reducing the need for complex external monitoring equipment.
3Reliability
If communication path is selected based on physical layer state, then transmission quality is improved, but measurement precision requirements increase
Solution Approach 1:
The patent measures specific key parameters of the physical layer state (such as signal-to-noise ratio, bit error rate, and frame reception quality) rather than attempting to measure all possible physical characteristics. By focusing on the most critical parameters that directly impact communication reliability, the system achieves sufficient measurement precision for path selection without requiring excessively precise measurements of all physical layer attributes.
Data Source
AI summary
Operation methods of a first communication node in a network, in particular, an Ethernet-based vehicle network, include: transmitting, by the first communication node to at least one communication node which is connected to the first communication node, a first frame requesting state information of a physical layer between the first communication node and the at least one communication node; receiving, by the first communication node from the at least one communication node, a second frame in response to the first frame; and identifying, by the first communication node, a state of the physical layer based on the second frame when the second frame is received.