Vehicle Log Differencing by Driving State to Cut Data Transmission
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Solution Overview
Problem
In-vehicle network logs transmitted to external servers require significant data communication resources due to low similarity between current and past logs, leading to reduced compression rates and increased data transmission.
Innovation Solution
A vehicle log transmission device that extracts vehicle states from obtained logs, selects corresponding difference generation logs, and generates difference logs for efficient data transmission by matching current logs with stored logs, reducing the amount of data sent to the server.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicle logs are transmitted in an undivided state to external servers, then the complete log data can be analyzed for security threats, but the amount of data communicated increases significantly
Solution Approach 1:
The patent divides vehicle logs into multiple segments based on time periods and vehicle states. Each segment is processed separately to identify differences, reducing the amount of data that needs to be transmitted to external servers while maintaining complete log analysis capability.
Solution Approach 2:
The patent extracts only the difference logs (changes from normal state) rather than transmitting complete logs. By identifying and extracting only the anomalous portions that deviate from baseline vehicle states, the communication data volume is significantly reduced while security threats are still detectable.
2Quantity of substance
If logs are divided into predetermined sizes for comparison, then data communication volume is reduced, but the similarity between current and past logs decreases
Solution Approach 1:
The patent dynamically adjusts log segmentation based on vehicle states rather than using fixed predetermined sizes. Logs are divided according to actual vehicle operational conditions (acceleration, deceleration, turning, etc.), ensuring that segments maintain high similarity with corresponding historical logs while still reducing overall communication volume.
Solution Approach 2:
The patent changes the segmentation parameters from fixed sizes to state-based divisions. By using vehicle state information (speed changes, direction changes, operational modes) as segmentation criteria, the system maintains high log similarity for comparable states while adapting to varying log lengths and content.
3Quantity of substance
If difference logs are generated based on vehicle states, then the compression rate of difference data improves, but the device complexity increases
Solution Approach 1:
The patent performs preliminary processing of vehicle logs locally before transmission. By pre-identifying vehicle states, pre-segmenting logs according to these states, and pre-calculating difference logs using stored baseline data, the system reduces the complexity of server-side processing and minimizes the data that needs to be transmitted.
Solution Approach 2:
The patent uses stored baseline logs as reference copies for comparison with current logs. By maintaining copies of normal vehicle states locally and comparing current segmented logs against these copies, the system efficiently identifies differences without requiring complex real-time analysis or large data transmissions.
Data Source
AI summary
A vehicle log transmission device includes: a vehicle log obtainer that obtains the vehicle log; a vehicle state extractor that extracts a vehicle state from the obtained vehicle log; difference generation log storage that stores a list of difference generation logs, each being a vehicle log for each of vehicle states shared between the vehicle log transmission device and a vehicle log analysis server; a difference generation log selector that selects a difference generation log from the list in accordance with the extracted vehicle state; a difference log generator that generates a difference log based on the obtained vehicle log and the selected difference generation log; and a difference log transmitter that transmits, to the vehicle log analysis server, the generated difference log and a difference generation log identifier corresponding to the selected difference generation log.