In-Vehicle Message Timing Control for Unauthorized Signal Detection
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Solution Overview
Problem
Existing in-vehicle network technologies face challenges in accurately detecting unauthorized messages while preventing reduction in communication resource efficiency, particularly when periodic and event messages coexist, leading to potential misclassification of normal data as unauthorized and insufficient storage due to counter value usage in data fields.
Innovation Solution
The implementation of an in-vehicle device and detection method that includes a creation unit for periodic and event messages with identification information, where the transmission control unit transmits event messages after a waiting time that is longer than half the periodic message cycle but shorter than the full cycle, and a detection unit that monitors reception intervals to accurately identify unauthorized messages by comparing them against stored reference values or cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If event messages are transmitted immediately when generated, then communication responsiveness is improved, but unauthorized message detection accuracy deteriorates due to insufficient time interval from periodic messages
Solution Approach 1:
The transmission control unit dynamically adjusts the transmission timing of event messages based on the timing of previously transmitted periodic messages. Instead of fixed immediate transmission, the system calculates an appropriate waiting period that balances responsiveness with detection accuracy, making the transmission timing adaptive rather than static.
Solution Approach 2:
The invention changes the time interval parameter between message transmissions. By setting the waiting period for event message transmission to be longer than half the periodic message cycle but shorter than the full cycle, the system optimizes the temporal parameter to prevent misclassification while maintaining communication efficiency.
2Measurement precision
If waiting time for event message transmission is increased, then unauthorized message detection accuracy is improved, but communication resource efficiency deteriorates due to unnecessary delays
Solution Approach 1:
The invention optimizes the waiting time parameter to a specific range (longer than half the periodic message cycle but shorter than the full cycle). This parameter optimization ensures that the waiting time is sufficient for accurate unauthorized message detection while minimizing unnecessary delays that would reduce communication efficiency.
3Extent of automation
If counter values are used in data fields for message identification, then message tracking capability is improved, but storage capacity deteriorates due to insufficient storage space
Solution Approach 1:
The invention extracts the message tracking function from the data field counter values and implements it separately in the transmission control unit and detection device. Instead of embedding counter values in the message data structure, the system tracks message timing externally, removing the storage burden from the limited data fields while maintaining full tracking capability.
Data Source
AI summary
Provided is an in-vehicle device configured to transmit, in an in-vehicle network, messages to which identification information is added. The messages include a periodic message and an event message. The in-vehicle device includes: a creation unit configured to create the periodic message and the event message; and a transmission control unit configured to transmit the periodic message and the event message created by the creation unit. In transmitting the event message, after a waiting time elapses from a transmission timing of a previously transmitted message among the messages to which the identification information of the same value as that of the event message to be transmitted is added, the transmission control unit transmits the event message to which the identification information of the same value is added. The waiting time is longer than half a transmission cycle of the periodic message and is shorter than the transmission cycle.