论文标题
大规模无线传感器网络的快速流量时间同步
Rapid-Flooding Time Synchronization for Large-Scale Wireless Sensor Networks
论文作者
论文摘要
准确且快速的时间同步对于无线传感器网络非常重要。洪水时间同步速度很快，但是其传输延迟和副跳跃误差积累严重降低了同步精度。在本文中，提出了针对大规模无线传感器网络的快速流体多种单向广播时间同步（RMTS）协议。为了最大程度地减少by-hop误差的积累，RMTS使用时钟偏差估计和时钟偏移估计的最大似然估计，并迅速在网络之间共享估计。结果，延迟引起的同步误差大大减少，而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个求助网络，RMT也能够在第三个同步期建立准确的同步，此外，当网络直径增加时，副跳跃误差的积累也较慢。
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 rapidflooding 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.
