APE-Sync: An Adaptive Power Efficient Time Synchronization for Mobile Underwater Sensor Networks
APE-Sync: An Adaptive Power Efficient Time Synchronization for Mobile Underwater Sensor Networks
复制标题
APE-Sync：用于移动水下传感器网络的自适应节能时间同步
DOI：
10.1109/access.2019.2912229
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发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Niaz, Ahmed
中科院分区：
文献类型：
--
作者：
Zhou, Feng;Wang, Qi;Niaz, Ahmed
时间同步是水下传感器网络节点间协同工作的基础，在水下传感器网络的应用和研究中起着至关重要的作用。目前，已有几种用于陆地无线电网络的时间同步协议，但由于水声信号传播速度慢、传感器节点间的移动性以及水下无线传感器网络中能量的限制，这些协议不能立即应用于实时水下传感器网络。在本文中，我们提出了一个自适应的功率有效的时间同步移动的水下传感器网络，称为APE同步。该方案考虑到时变时钟偏差，结合多普勒增强同步协议（DE-Sync）和跟踪时钟偏差的卡尔曼滤波器实现时间同步。该方案还有助于通过保证精确的时间同步来降低节点的能量消耗。仿真结果表明，APE-Sync在功率效率和精度方面都优于现有的时间同步方案。
Time synchronization is a cooperative work's foundation among underwater sensor networks' nodes; it takes a crucial role in the application and the study of underwater sensor networks. Several time synchronization protocols have been presented for terrestrial radio networks, but they cannot be instantly utilized to real-time underwater sensor networks due to the slow propagation speed of the underwater acoustic signals, the mobility among sensor nodes, and the energy limitation in the underwater wireless sensor networks. In this paper, we propose an adaptive power-efficient time synchronization for mobile underwater sensor networks, called APE-Sync. The proposed scheme takes into account the time-varying clock skew and combines the Doppler-Enhanced synchronization protocol (DE-Sync) and the Kalman filter tracking the clock skew to achieve time synchronization. The proposed scheme also helps in reducing the energy consumption of the nodes by guaranteeing accurate time synchronization. The simulation results are presented, which show that APE-Sync outperforms existent time synchronization schemes in both power efficiency and precision.