FlexRay Frame Timing Reconfiguration for Anomalous Transmission Defense
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Solution Overview
Problem
Existing anomaly detection methods for in-vehicle networks, such as those using the CAN protocol, are not applicable to FlexRay networks with a TDMA scheme, and there is a need for enhanced security measures to prevent unauthorized frame transmission in in-vehicle networks.
Innovation Solution
An anomaly handling method and device that detect anomalous frames in an in-vehicle network and dynamically switch the transmission timing of such frames based on predetermined information, making it difficult for attackers to predict the new timing, thereby maintaining network security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If anomaly detection is performed using fixed communication intervals as in CAN protocol, then anomaly detection is simple, but it is not applicable to FlexRay TDMA scheme where communication is performed at predetermined timings
Solution Approach 1:
The patent applies dynamics by making the transmission timing of safety-critical frames dynamic and unpredictable when anomalies are detected. Instead of fixed predetermined timings, the system switches to alternative transmission timings that are determined dynamically based on anomaly detection results, making the timing adaptive to security conditions while remaining applicable to FlexRay TDMA architecture
Solution Approach 2:
The patent changes the transmission timing parameter of frames when anomalies are detected. By modifying the transmission timing from fixed predetermined values to dynamically selected alternative timings, the system maintains compatibility with FlexRay TDMA while achieving anomaly detection capability that works within the protocol's timing constraints
2Reliability
If transmission timing of frames is switched to unpredictable values when anomaly is detected, then network security is improved, but transmission timing prediction becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple alternative transmission timings in advance. When an anomaly is detected, the system switches to one of these pre-prepared alternative timings rather than calculating new timings on the fly. This approach enhances security by making timing unpredictable while avoiding complex real-time calculations, as the alternatives are prepared beforehand
Solution Approach 2:
The patent combines multiple transmission timing options (normal predetermined timings and alternative timings) into a composite timing strategy. By maintaining a set of different timing values and selecting from them based on anomaly detection, the system achieves both security through unpredictability and manageability through pre-defined options
3Object-affected harmful factors
If dynamic transmission timing switching is implemented, then impact of anomalous frames is reduced, but communication traffic increases
Solution Approach 1:
The patent extracts and isolates the timing switching mechanism specifically for frames following anomaly detection, rather than changing timing for all communication traffic. By applying the dynamic timing switching only to affected frames and leaving normal communication unchanged, the system reduces the impact of anomalous frames while minimizing the increase in overall communication traffic
Data Source
AI summary
An anomaly handling method in an in-vehicle network includes: transmitting and receiving frames; detecting a frame having an anomaly; and switching, when the anomaly is detected in the detecting, a transmission timing of the frame in which the anomaly is detected. The switching includes changing a switched transmission timing to which the transmission timing is switched, according to predetermined information.