Faculty of Computing, Universiti Teknologi Malaysia (UTM), Johor 81310, Malaysia.
Sensors (Basel). 2014 Feb 5;14(2):2510-48. doi: 10.3390/s140202510.
Recently sink mobility has been exploited in numerous schemes to prolong the lifetime of wireless sensor networks (WSNs). Contrary to traditional WSNs where sensory data from sensor field is ultimately sent to a static sink, mobile sink-based approaches alleviate energy-holes issues thereby facilitating balanced energy consumption among nodes. In mobility scenarios, nodes need to keep track of the latest location of mobile sinks for data delivery. However, frequent propagation of sink topological updates undermines the energy conservation goal and therefore should be controlled. Furthermore, controlled propagation of sinks' topological updates affects the performance of routing strategies thereby increasing data delivery latency and reducing packet delivery ratios. This paper presents a taxonomy of various data collection/dissemination schemes that exploit sink mobility. Based on how sink mobility is exploited in the sensor field, we classify existing schemes into three classes, namely path constrained, path unconstrained, and controlled sink mobility-based schemes. We also organize existing schemes based on their primary goals and provide a comparative study to aid readers in selecting the appropriate scheme in accordance with their particular intended applications and network dynamics. Finally, we conclude our discussion with the identification of some unresolved issues in pursuit of data delivery to a mobile sink.
最近，许多方案都利用下沉移动性来延长无线传感器网络 (WSN) 的寿命。与传统的 WSN 不同，传统的 WSN 最终将传感器字段的传感数据发送到静态下沉，基于移动下沉的方法缓解了能量空洞问题，从而促进了节点之间的平衡能耗。在移动场景中，节点需要跟踪移动下沉的最新位置以进行数据传输。然而，频繁传播下沉拓扑更新会破坏节能目标，因此应该加以控制。此外，控制下沉拓扑更新的传播会影响路由策略的性能，从而增加数据传输延迟并降低分组投递率。本文对利用下沉移动性的数据收集/分发方案进行了分类。根据在传感器场中如何利用下沉移动性，我们将现有方案分为三类，即路径约束、路径非约束和基于受控下沉移动性的方案。我们还根据它们的主要目标对现有方案进行了分类，并进行了比较研究，以帮助读者根据特定的应用程序和网络动态选择合适的方案。最后，我们确定了一些未解决的问题，以追求向移动下沉传输数据。
