Measures to Improve the Accuracy and Reliability of Clock Synchronization in Time-Sensitive Networking

Abstract

Most of the time-sensitive networking standards are based on a high precise and reliability time reference, which is accomplished by IEEE 802.1 AS. However, the accuracy and reliability of clock synchronization could be affected in practice. To conquer the inaccuracy resulting from the collision between different packets, an algorithm that combines time-slot-based synchronization and priority scheduling is proposed. To improve the reliability, an abnormal recovery strategy of the master clock is proposed. The proposed algorithms are implemented on the OMNet++ simulation platform with an typical in-vehicle network topology. The simulation results show that the clock synchronization accuracy could achieve sub-microsecond level even if there are interference flows, and the abnormal recovery mechanism can maintain the stable state of the clock.

Keywords

• Clock synchronization
• time slot
• priority
• network reconstruction
• clock frequency synchronization
• time-sensitive networking