ASIL Gateway for Ethernet-CAN Protocol Integrity Verification
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Solution Overview
Problem
Current vehicle network communication technologies, such as CAN and FlexRay-based networks, fail to meet the higher transmission rate and system expandability requirements of advanced safety systems like telematics and infotainment, and the MOST-based network is costly, necessitating the use of Ethernet-based networks, but requiring improved communication reliability between different protocols.
Innovation Solution
Implementing an automotive safety integrity level (ASIL) based communication method that involves integrity verification of messages between Ethernet and CAN networks, using a gateway to generate and transmit verified messages with ASIL authentication information, ensuring reliable communication by discarding unverified messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If MOST-based network is applied to vehicle networks, then transmission rate is improved, but cost increases
Solution Approach 1:
The patent replaces the expensive MOST-based network with a cheaper Ethernet-based network that can achieve comparable transmission rates. The Ethernet network uses standard, cost-effective components while providing sufficient performance for vehicle communication needs, thereby reducing overall system cost without sacrificing transmission rate requirements.
Solution Approach 2:
The patent changes the network protocol parameters from MOST to Ethernet, leveraging Ethernet's capability to achieve transmission rates up to 10 Gbps. This parameter change allows the system to meet high-speed requirements while utilizing more cost-effective Ethernet infrastructure and components compared to MOST technology.
2Speed
If Ethernet-based network is used, then cost is reduced and transmission rate is improved, but communication reliability between different protocols deteriorates
Solution Approach 1:
The patent introduces a gateway as an intermediary device between the Ethernet-based network and the CAN network. This gateway performs protocol conversion and message verification, ensuring reliable communication between the different network protocols. The gateway validates messages using ASIL authentication information, maintaining communication reliability while enabling interoperability between Ethernet and CAN networks.
Solution Approach 2:
The patent implements a feedback mechanism through the gateway that verifies messages using ASIL authentication information. The gateway checks the integrity and authenticity of messages transmitted between Ethernet and CAN networks, providing feedback validation to ensure communication reliability. This feedback loop detects and prevents communication errors, maintaining high reliability across protocol boundaries.
3Adaptability or versatility
If protocol conversion is implemented between CAN and Ethernet, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the protocol conversion function into a dedicated gateway component, separating it from the main network infrastructure. This segmentation allows the gateway to handle protocol conversion and ASIL verification independently, making the overall system more manageable. The gateway's specialized function reduces the complexity burden on other network components while maintaining high adaptability between CAN and Ethernet protocols.
Data Source
AI summary
An operation method of a first communication node supporting communications between an Ethernet-based network and a controller area network (CAN) includes: receiving an Ethernet message from a second communication node belonging to the Ethernet-based network; performing an integrity verification on first automotive safety integrity level (ASIL) authentication information included in the Ethernet message; generating a CAN message based on the Ethernet message for which the integrity verification has been completed; and transmitting the CAN message to a third communication node belonging to the CAN.