【摘要】 能量捕获无线传感器网络(Energy-harvesting wireless sensor network,EH-WSN)的节点可以从环境中捕获能量.目前,EH-WSN节点所捕获的能量与维持其正常工作(例如感测、计算和数据通信)所需能耗之间存在着较大缺口.节点常因能量不足需要捕获能量而停止数据转发工作,从而导致数据收集时延增大.因此,为EH-WSN设计一个低时延的数据收集策略是极为重要.对无线链路定义了能够反映能量捕获功率、能量捕获时长和剩余能量的权值,并利用之提出数据收集树构建算法,让具有较小权值的链路优先加入到数据收集树;提出了低时延数据收集策略,使得EHWSN的节点利用所构建的数据收集树传递数据.仿真结果表明:所提出的低时延数据收集策略在数据收集时延方面优于已有方案.更多还原

【Abstract】 The nodes in energy-harvesting wireless sensor network(EH-WSN)harvest energy from ambience.Currently,there is a big gap between the energy harvested from ambience and that needed to support node’s normal operations,such as sensing,computing,data communications etc.Hence,it is unavoidable that a node stops data forwarding to harvest energy due to shortage of energy,which results in a longer delay in gathering data.As a result,it is important to design a low-delay data gathering scheme for EH-WSN.In this paper,the weight of wireless link is defined that considers energy harvesting ratio,energy harvesting duration,and residual energy.Based on the defined weight,a data gathering tree construction algorithm is presented,which chooses the link with a smaller weight to join the tree prior to the others.Moreover,the low delay data gathering scheme is proposed,which lets the EH-WSN nodes deliver data using the built tree.The simulation results show the proposed scheme outperforms the existing schemes in terms of data gathering delay.更多还原