Methods for providing time synchronization quality

The method monitors synchronization messages to ensure reliable time synchronization in vehicle networks by measuring parameters and adapting responses, addressing integrity and reliability issues in IEEE 802.1AS, enhancing safety and cost-effectiveness.

DE102024122569B4Active Publication Date: 2026-06-18CARIAD SE
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
CARIAD SE
Filing Date
2024-08-07
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Current time synchronization protocols in vehicle networks, such as IEEE 802.1AS, lack mechanisms to ensure the integrity and reliability of synchronization data, making them susceptible to errors, temperature fluctuations, and potential attacks, which can be critical for applications like sensor data fusion in automated driving.

Method used

A method for monitoring synchronization messages to determine their quality by measuring parameters like frequency, accuracy, and failures, allowing for flexible responses such as changing the time master or adjusting network paths to maintain reliable synchronization.

Benefits of technology

Ensures reliable and secure time synchronization by detecting errors early, adapting to network conditions, and preventing misinterpretations, thereby enhancing the safety and cost-effectiveness of vehicle systems.

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Abstract

Method for providing time synchronization quality in a network (100), in particular Ethernet, e.g. for a vehicle, comprising: - Determining a time master (M) in the network (100), - Monitoring synchronization messages (Sync, Follow_Up), in particular to determine parameters of the synchronization messages (Sync, Follow_Up), - Determining the synchronization quality (G) of the time master (M) depending on monitoring, in particular depending on parameters of the synchronization messages (Sync, Follow_Up), - Performing potential replacement reactions (141, 142, 143) if insufficient quality of the time master (M) has been determined.
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