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A memory-lite time synchronization protocol for wireless sensor networks

机译：无线传感器网络的轻量级时间同步协议

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摘要

Wireless sensor networks (WSNs) used in distributed surveillance commonly requires network-wide time synchronization. Most existing time synchronization protocols assume that the clock with each node can be modeled by a linear equation at + b with t being the universal time, a the clock drift (skew) coefficient, and b the clock offset. Some protocols assume that a = 1, hence the synchronization target is the parameter b while others assume that a could deviate from one and both parameters a and b are the synchronization targets. In the latter case algorithmic synchronization details become complicated, requiring either involved computation or memory use. For example, the recently proposed Average TimeSync (ATS) protocol demands expensive use of memory within each WSN node. In this work a memory-lite time synchronization (MLTS) protocol is proposed, which can achieve synchronization of both drift and offset just by sending synchronization packet including the past time stamps received by the sender node, but the number of such past stamps is minor. Both simulation and hardware experimental results justify that the proposed memory-lite protocol is still capable of effective distributive time synchronization with robustness but at the slight price of a little slowed down synchronization speed.
机译：分布式监视中使用的无线传感器网络（WSN）通常需要网络范围的时间同步。现有的大多数时间同步协议都假定，每个节点的时钟都可以通过线性方程在+ b处建模，其中t为通用时间，a时钟漂移（时滞）系数和b时钟偏移。一些协议假设a = 1，因此同步目标是参数b，而其他协议则假设a可能偏离一个，并且参数a和b都是同步目标。在后一种情况下，算法同步细节变得复杂，需要涉及计算或内存使用。例如，最近提出的平均时间同步（ATS）协议要求在每个WSN节点内昂贵地使用内存。在这项工作中，提出了一种轻存储时间同步（MLTS）协议，该协议仅通过发送包括发送方节点接收到的过去时间戳的同步包就可以实现漂移和偏移的同步，但是这种过去时间戳的数量很少。仿真和硬件实验结果均证明，所提出的“内存精简”协议仍然能够以鲁棒性进行有效的分布式时间同步，但代价是稍微降低了同步速度。

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