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Rapid-Flooding Time Synchronization for Large-Scale Wireless Sensor Networks

机译:大型无线传感器网络的快速洪水时间同步

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摘要

Accurate and fast-convergent time synchronization is very important for wireless sensor networks. The flooding time synchronization converges fast, but its transmission delay and by-hop error accumulation seriously reduce the synchronization accuracy. In this article, a rapid-flooding multiple one-way broadcast time-synchronization (RMTS) protocol for large-scale wireless sensor networks is proposed. To minimize the by-hop error accumulation, the RMTS uses maximum likelihood estimations for clock skew estimation and clock offset estimation, and quickly shares the estimations among the networks. As a result, the synchronization error resulting from delays is greatly reduced, while faster convergence and higher-accuracy synchronization is achieved. Extensive experimental results demonstrate that, even over 24-hops networks, the RMTS is able to build accurate synchronization at the third synchronization period, and moreover, the by-hop error accumulation is slower when the network diameter increases.
机译:准确且快速收敛的时间同步对于无线传感器网络非常重要。洪水时间同步迅速收敛,但其传输延迟和逐跳误差累积严重降低了同步精度。在本文中,提出了一种用于大型无线传感器网络的快速泛滥的多向广播时间同步(RMT)协议。为了最小化逐跳误差累积,RMT使用针对时钟偏斜估计和时钟偏移估计的最大似然估计,并且快速共享网络之间的估计。结果,延迟产生的同步误差大大减少,而实现了更快的收敛性和更高的准确性同步。广泛的实验结果表明,即使超过24秒的网络,RMT也能够在第三同步时段内构建精确同步,而且,当网络直径增加时,逐跳误差累积较慢。

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