Vehicle Network Time Synchronization with Abnormality Detection
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Solution Overview
Problem
Existing vehicle-mounted networks face issues with time synchronization abnormalities due to unauthorized attacks on the grandmaster clock, leading to improper synchronization and potential operational discrepancies among connected apparatuses.
Innovation Solution
A vehicle-mounted apparatus equipped with a time synchronization unit, detection unit, and abnormality processing unit that monitors and detects abnormalities in time synchronization information, allowing for the stoppage of synchronization processes to prevent further synchronization errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time synchronization is performed using a grandmaster clock on a vehicle-mounted network, then time synchronization accuracy is improved, but the system becomes vulnerable to unauthorized attacks that can cause synchronization abnormalities
Solution Approach 1:
The detection unit performs preliminary monitoring of time synchronization information before it is fully processed by the time synchronization unit. By detecting abnormalities in advance (such as unexpected changes in time values or transmission patterns), the system can prevent synchronized time errors from propagating across the network, thus maintaining reliability while preserving synchronization accuracy.
Solution Approach 2:
The abnormality detection unit acts as an intermediary between the time synchronization information source and the time synchronization unit. It monitors and validates the incoming synchronization data, filtering out potentially harmful information from unauthorized attacks before it can affect the synchronization process, thereby protecting the system while maintaining accurate timekeeping.
2Reliability
If the system monitors time synchronization information for abnormalities, then synchronization reliability is improved, but the device complexity increases
Solution Approach 1:
The detection unit is integrated within the existing vehicle-mounted apparatus rather than being a separate external component. It leverages the same communication interfaces and processing resources already present in the time synchronization unit, allowing a single apparatus to perform both time synchronization and abnormality detection functions, thus improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The time synchronization apparatus performs self-monitoring through the integrated detection unit, which automatically checks incoming synchronization information for abnormalities without requiring external monitoring systems. This self-service capability enhances synchronization reliability while avoiding the complexity of additional external monitoring infrastructure.
Data Source
AI summary
A vehicle-mounted apparatus to be used on a vehicle-mounted network includes: a time synchronization unit configured to calculate a time difference with another vehicle-mounted apparatus by transmitting and receiving time synchronization information, which is information for time synchronization between the vehicle-mounted apparatus and the other vehicle-mounted apparatus, and to perform time synchronization with the other vehicle-mounted apparatus based on the calculated time difference; a detection unit configured to monitor first transmission information, which is information transmitted to the vehicle-mounted apparatus from the other vehicle-mounted apparatus, and to detect an abnormality in a content of the first transmission information; and an abnormality processing unit configured to perform a stop process for stopping time synchronization on the vehicle-mounted network using the time synchronization information transmitted from the other vehicle-mounted apparatus when an abnormality has been detected by the detection unit.