Details of Research Outputs

节点连通性是无线传感器网络研究的热点问题之一,然而由于节点能量耗尽、硬件故障以及通信链路失效等问题的存在,造成网络分割,因此如何确保网络连通成为无线传感器网络亟待解决的关键性问题.近年来,一个新的研究趋势是通过引入计算能力较强且能量较为充足的移动性节点来进行连通控制,提高无线传感器网络的整体性能.本文对目前利用移动性节点的主流连通控制方法进行了充分调研,通过对这些方法的详细分类和比较,归纳了移动式连通控制的各类方法的特点,分析了这些方法的性能和适用范围,总结了研究中存在的主要问题与挑战,并指出了未来可能的研究方向. 

The connectivity of sensors is one of the main research problems in wireless sensor networks (WSNs). Data can be forwarded through connected sensor nodes. However, because of energy depletion, hardware failure and communication link failure, the network may be partitioned. How to guarantee the connectivity becomes an urgent issue in wireless sensor networks. Traditional work usually focuses on maximizing the connectivity with minimum sensors. In recent years, a new research trend is to utilize mobile elements for connectivity control. Since the mobile element is more powerful than normal sensors, it improves the performance of many aspects in wireless sensor networks. In this paper, we make a comprehensive investigation about the current major connectivity control methods with mobile elements. We first summarize the characteristics of mobile topology control methods via a new classification. Based on the classification, these methods are compared to each other according to a serial parameters. Finally, we analyze the performances and the application scopes of these methods, summarize the main problems, and point out the future research directions.