In-Vehicle Signal Group Routing With Precomputed E2E Protection
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Solution Overview
Problem
Existing in-vehicle signal transmission methods experience excessive delay and high hardware costs due to gateway calculations of CRC and Counter values, and require high functional security levels when messages are split or destroyed.
Innovation Solution
Divide messages into multiple signal groups at the sending end, apply security verification-related parameters, and send them in a first format to the gateway, which then disassembles and sends them in a second format directly to the receiving end, eliminating the need for gateway recalculations and high security level requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gateway performs multiple calculations of CRC and Counter values after receiving CAN FD messages, then the functional security level is improved, but the transmission delay increases excessively
Solution Approach 1:
The transmitting end ECU pre-calculates and embeds the CRC and Counter values into the CAN FD message before transmission. The gateway receives the pre-processed message and only performs verification without recalculation, thus maintaining functional security while minimizing transmission delay.
2Adaptability or versatility
If the gateway splits complete messages protected by E2E, then the message routing flexibility is improved, but the functional security level requirement increases to the highest level
Solution Approach 1:
The message is segmented into multiple signal groups at the transmitting end ECU, with each group independently protected by E2E mechanisms. This allows the gateway to route different signal groups independently without compromising the integrity of the complete message, thus achieving routing flexibility while maintaining security at a manageable level.
Data Source
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AI summary
A method and a system for in-vehicle signal transmission, to enable a message transmission from a signal sending end in a vehicle, via a gateway, to a signal receiving end in the vehicle , the method includes the following steps: obtaining and dividing, at the signal sending end, a message to be sent into multiple signal groups, and determining security verification-related parameters corresponding to at least one signal group that needs end-to-end protection, and writing the determined security verification-related parameters into the corresponded signal group(s), and then generating a message in a first format for all signal groups and sending the message in the first format to the gateway; disassembling, at the gateway, the message in the first format into a plurality of messages in a second format corresponding to the signal groups in units of signal groups respectively, and sending the messages in the second format to the signal receiving end; and verifying, at the signal receiving end, the messages in the second format having the security verification-related parameters to complete a signal transmission. The present application can increase a transmission speed of signals in the vehicle and reduce hardware requirements of the gateway.