| 无线传感器网络混合触发一致性时间同步 |
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| 引用本文： | 陈珍萍,李德权,黄友锐,唐超礼.无线传感器网络混合触发一致性时间同步[J].仪器仪表学报,2015,36(10):2193-2199. |
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| 作者姓名： | 陈珍萍 李德权 黄友锐 唐超礼 |
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| 作者单位： | １．安徽理工大学电气与信息工程学院淮南232001；2．安徽理工大学理学院淮南232001 |
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| 基金项目： | 国家自然科学基金(51404008，51274011，61472003)项目资助 |
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| 摘 要： | 针对无线传感器节点能量有限、无线通信环境差的特点,将事件触发通信机制应用于无线传感器网络(WSNs)的时间同步中,提出一种混合触发一致性时间同步(MTCTS)算法,并研究同步能耗的降低方法及传输延迟和数据丢包对同步算法的影响。节点的时钟特性建模成二阶状态方程,每个节点通过与其邻居节点交换本地时间这一状态信息获得同步控制输入,从而实现WSNs的时间同步。在所提出的一致性同步算法中,每个节点周期性地更新状态,根据当前状态是否满足给定的事件触发条件去触发通信事件的发生,如此降低通信事件的发生频率。在假定传输延迟服从指数分布和所有节点丢包率相同的情况下,进一步研究了传输延迟、信息丢包对同步精度和算法收敛性的影响。实验和MATLAB仿真验证了所提算法的有效性,并通过仿真确定出了传输延迟和丢包率的上界。
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| 关 键 词： | 无线传感器网络 时间同步 一致性 混合触发 |
Mixed triggered consensus time synchronization for wireless sensor networks |
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| Chen Zhenping,Li Dequan,Huang Yourui,Tang Chaoli.Mixed triggered consensus time synchronization for wireless sensor networks[J].Chinese Journal of Scientific Instrument,2015,36(10):2193-2199. |
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| Authors: | Chen Zhenping Li Dequan Huang Yourui Tang Chaoli |
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| Affiliation: | 1. School of Electrical and Information Engineering, Anhui University of Science and Technology, Huainan 232001, China;
2. School of Science, Anhui University of Science and Technology, Huainan 232001, China |
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| Abstract: | Aiming at the features of limited energy supply in WSN node and adverse wireless communication environment, this paper applies event triggered communication mechanism to the time synchronization of wireless sensor networks, and proposes a mixed triggered consensus time synchronization algorithm, which includes both the time triggered and event triggered mechanisms. The reduction method of synchronization energy consumption and the effects of the transmission delay and packet loss on the synchronization algorithm are also investigated. The clock feature of the node is modeled as a second order state equation, and each node obtains the synchronization control input through exchanging the state variable, its local time, with its neighbor nodes, and the time synchronization in the WSNs is realized. In the proposed consensus synchronization algorithm, each node updates its states periodically and triggers the communication event according to whether its current states satisfy the given event triggered conditions, thus the communication event frequency is reduced. Given that the transmission delay obeys exponential distribution and all the nodes in the network have the same packet loss rate, the influence of the transmission delay and information packet loss on the synchronization precision and the convergence of the algorithm is further studied. The experiment and Matlab simulations verify the effectiveness of the proposed algorithm; and the upper bounds for transmission delay and packet loss rate are determined with simulations. |
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| Keywords: | wireless sensor network time synchronization consensus mixed trigger |
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