Uncertainty Aware Hybrid Clock Synchronisation in Wireless Sensor Networks
Uncertainty Aware Hybrid Clock Synchronisation in Wireless Sensor Networks
复制标题
无线传感器网络中的不确定性感知混合时钟同步
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Andy Breuhan
中科院分区：
文献类型：
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作者：
Christoph Steup;Sebastian Zug;J. Kaiser;Andy Breuhan
—无线传感器网络旨在可靠地监控现实世界的现象，需要对检测到的单个事件进行组合和后处理。如果没有单个事件背景的可靠信息，这是不可能的。其中一个非常重要的信息就是时间。它可以对事件进行排序，并推断更多数据，例如速率和持续时间。不可靠的时间基准不仅会影响事件的顺序，还会影响推导出的值，因此推导出的值也是不可靠的。因此，各个节点的时钟同步对于系统的可靠性非常重要。另一方面，紧密且可靠的同步通常会导致大量的消息开销，这在 WSN 场景中通常是无法容忍的。本文提出了一种新的混合同步机制，可在单跳环境中实现紧密同步，在多跳环境中实现宽松同步。通过传递给应用程序的显式同步不确定性可以缓解缺乏保证的同步精度的问题。这使得应用程序能够对当前同步精度的变化做出反应。
—Wireless Sensor Networks, aiming to monitor the real world’s phenomena reliably, need to combine and post-process the detected individual events. This is not possible without reliable information of the context of the individual event. One such information of very high importance is time. It enables ordering of events as well as deduction of further data like rates and durations. An unreliable time base influences not only the ordering of events, but also the deduced values, which in consequence are unreliable as well. Therefore the synchronization of the clocks of the individual nodes is of high importance to the reliability of the system. On the other hand tight and reliable synchronization typically induces a large message overhead, which is often not tolerable in WSN scenarios. This paper proposes a new hybrid synchronization mechanism enabling tight synchronization in single hop environments and looser synchronization in multi hop environments. The lack of a guaranteed synchronization precision is mitigated by an explicit synchronization uncertainty, which is passed to the application. This enables the application to react to changes in the current synchronization precision.