基于概率的EPA Wireless时钟同步方法

发布时间：2018-12-07 16:17

【摘要】：针对在EPA Wireless协议中采用单报文广播(SPB)的时钟同步方法存在同步时间长、发送报文数目多、协议的宏周期长等问题,提出基于概率的用于EPA Wireless同步(PBS)方法.PBS只须分配较少的同步机会,每个机会中所有节点都以相等的概率发送同步报文.理论上PBS需要很少的时间和报文来保持节点和网关之间的同步,可以减少EPA Wireless的宏周期;此外PBS方法更加节能,并且可以减少网络流量.PBS方法的性能不会随着节点数目增多而明显下降.使用PBS,从节点与网关时钟之间的时钟偏差比SPB大,但是该偏差不会影响到协议的功能.将该方法在组建的无线网络上进行实验,结果表明:基于概率的时钟同步方法在实际上和理论上的性能是一致的.
[Abstract]:In order to solve the problems such as long time of synchronization, large number of packets sent, long macro period of protocol and so on, the clock synchronization method of single packet broadcast (SPB) in EPA Wireless protocol has many problems, such as long synchronization time, large number of packets sent and long macro period. A probabilistic (PBS) method for EPA Wireless synchronization is proposed. PBS only needs to allocate fewer synchronization opportunities and all nodes in each opportunity send synchronization packets with equal probability. In theory, PBS needs very little time and packets to keep the synchronization between nodes and gateways, which can reduce the macro period of EPA Wireless. In addition, the PBS method is more energy efficient and can reduce network traffic. The performance of the PBS method does not decrease with the number of nodes increasing. The clock deviation between the slave node and the gateway clock using PBS, is larger than that of SPB, but this deviation will not affect the function of the protocol. The experimental results on the constructed wireless network show that the probability-based clock synchronization method is in agreement with the theoretical performance in practice.
【作者单位】：浙江大学工业控制技术国家重点实验室;
【基金】：国家自然科学基金资助项目(61074028) 国家“863”高技术研究发展计划资助项目(2012AA041102)
【分类号】：TP212.9;TN929.5

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