Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System
1
Department of Electrical Engineering, Myongji University, Yongin 17058, Korea
2
School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Korea
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(20), 5784; https://doi.org/10.3390/s20205784
Received: 7 August 2020
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Revised: 12 October 2020
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Accepted: 12 October 2020
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Published: 13 October 2020
(This article belongs to the Section Sensor Networks)
This paper proposes a distributed nodes-based clock synchronization method to sustain sub-microsecond precision synchronization of slave clocks upon master clock failure in IEEE 1588 PTP (precision time protocol) system. The sustaining is achieved by synchronizing the slave clocks to the estimated reference clock which is obtained from the analysis of distributed slave clocks. The proposed method consists of two clock correction functions (i.e., a self-correction and a collaborative correction, respectively). Upon master failure, the self-correction estimates a clock correction value based on the clock model which is constructed during normal PTP operation. The collaborative correction is performed in the preselected management node. The management node estimates a reference clock by collecting and analyzing clock information gathered from the other slave clocks. The performance of the proposed method is simulated by computer to show its usefulness. It is confirmed that the fifty (50) clock model-based collaborative correction maintains 10−6 second PTP accuracy for 10 min prolonged period after the master failure when tested with clock offset variations less than 50 ppm.
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Keywords:
precision time synchronization; distributed sensing environment; IEEE 1588 precision time protocol
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MDPI and ACS Style
Son, K.J.; Chang, T.G. Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System. Sensors 2020, 20, 5784. https://doi.org/10.3390/s20205784
AMA Style
Son KJ, Chang TG. Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System. Sensors. 2020; 20(20):5784. https://doi.org/10.3390/s20205784
Chicago/Turabian StyleSon, Kyou J., and Tae G. Chang. 2020. "Distributed Nodes-Based Collaborative Sustaining of Precision Clock Synchronization upon Master Clock Failure in IEEE 1588 System" Sensors 20, no. 20: 5784. https://doi.org/10.3390/s20205784
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