Feedback-based clock synchronization in wireless sensor networks: A control theoretic approach

Jiming Chen, Qing Yu, Yan Zhang, Hsiao Hwa Chen, Youxian Sun

研究成果: Article同行評審

78 引文 斯高帕斯(Scopus)

摘要

Most wireless sensor networks (WSNs) employ a sleep clock to enable sensor onoff mode to save energy. Since the sleep clock usually works at a relatively low frequency, it is important to correct the long-term synchronization error caused by instability and nonlinearity. In this paper, the time synchronization issue in a WSN is formulated as a closed-loop control problem. Using the proportionalintegral (PI) control principle, we propose a feedback-based synchronization (FBS) scheme to compensate the clock drift caused by both internal perturbation and external disturbance. Synchronization accuracy and FBS dynamics are analyzed in terms of response time and overshoot. We also derive a formula to determine the controller parameters for different synchronization accuracy and response-time requirements. Extensive experiments have been conducted to evaluate this synchronization scheme. The results indicate that FBS is much more robust than the delay measurement time-synchronization (DMTS) protocol in different synchronization durations and sensor node configurations. It is shown that FBS achieves almost the same accuracy as the flooding time-synchronization protocol (FTSP) when synchronization period $P$ is less than 60 s, and it outperforms FTSP when $P$ is longer than 60 s. Furthermore, the experimental results reveal that FBS's response to an external disturbance is faster than that of FTSP in one- or two-hop WSN scenarios. In addition, FBS consumes fewer resources than FTSP.

原文English
文章編號5460894
頁(從 - 到)2963-2973
頁數11
期刊IEEE Transactions on Vehicular Technology
59
發行號6
DOIs
出版狀態Published - 2010 7月

All Science Journal Classification (ASJC) codes

  • 汽車工程
  • 航空工程
  • 電氣與電子工程
  • 應用數學

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