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簇路由是节省无线传感网络(WSNs)能量的有效策略。簇头的选择是簇路由的关键。然而,传统的簇路由是采用固定周期更新簇头,并没有考虑到簇头的剩余能量。为此,针对稳定簇头选择协议(SEP)进行改进,提出基于多级能量阈值的簇头更新策略,记为I-SEP。I-SEP路由考虑三类节点,这三类节点的初始能量不同。并针对三类节点的能量以及比例,计算它们成为簇头的概率和阈值。同时,每轮计算簇头的剩余能量,只有簇头剩余能量小于预定的阈值,才进行簇头更新,否则原来的簇头仍作为簇头,进而减少了更换簇头所带来的能耗。仿真结果表明,相比于SEP,提出的I-SEP路由有效地降低了能耗,延长了网络寿命。 相似文献
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LEACH路由协议是无线传感器网络中经典的层次型拓扑组织算法。对LEACH协议进行研究和分析,指出LEACH协议在簇的区域分布和簇头负载不均衡等方面问题。文章通过节点剩余能量和与基站的距离对簇头选择、构造分簇以及非簇节点选择簇头进行改进。并利用MATLAB对改进后的算法进行仿真,表明改进后的算法有效地均衡节点能量消耗,并延长网络生存时间。 相似文献
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LEACH路由协议是无线传感器网络中经典的层次型拓扑组织算法。对LEACH协议进行研究和分析,指出LEACH协议在簇的区域分布和簇头负载不均衡等方面问题。文章通过节点剩余能量和与基站的距离对簇头选择、构造分簇以及非簇节点选择簇头进行改进。并利用MATLAB对改进后的算法进行仿真,表明改进后的算法有效地均衡节点能量消耗,并延长网络生存时间。 相似文献
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本文将无线传感网络的能量采集模型进行综述,并对无线传感网络的两种路由协议进行仿真与比较,LEACH路由协议和HEED路由协议进行分析比较,HEED协议是基于LEACH协议的一种改进协议。LEACH协议没有能量意识,HEED在簇头选举阶段引入能量因素,节点生存周期明显有所延长。 相似文献
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无线传感器网络(WSN,Wireless Sensor Network)中,如何减少节点的能耗一直是簇头选择机制的研究目标。现提出了一种基于历史能耗信息选择机制的簇头选择算法(CHCM,Cluster Head Choosing Mechanism),该算法通过节点历史能耗信息和节点分布密度参数预测簇头能耗速度,并将该预测方法融入簇头选取过程当中,使网络生命期延长。最后利用CHCM对LEACH路由协议进行改进,得到CHCM+LEACH路由协议。仿真结果表明CHCM+LEACH在网络生命期和网络总剩余能量上分别比LEACH算法分别提高了27%和14%。 相似文献
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经典的分簇路由协议LEACH在无线传感器网络中有着非常广泛的应用,针对LEACH协议在成簇时没有考虑簇头节点的能量等因素的缺陷,为延长网络生存期在LEACH协议基础之上,在簇头选择公式中加入节点剩余能量的参数,使得选举能量较高的节点为簇头,提出改进的LEACH协议。并在网络模拟软件NS2平台下,对改进的LEACH协议与原LEACH协议进行仿真比较分析,结果表明改进后的协议中各个节点能耗均衡,避免个别节点过早衰亡,可以延长网络生存期。 相似文献
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针对无线传感器网络中存在的热区问题,采用非均匀部署方案,并在此基础上提出基于能量预测的无线传感器网络节点覆盖调度算法。并对算法进行了仿真实验和性能分析。结果表明该算法可以延长的网络生命周期并在较长的时间里保持较高的网络覆盖率,能够达到网络内大多数节点能耗均衡的设计目标。 相似文献
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To maximize the network lifetime of a wireless sensor network, an efficient transmission technique is critical. The energy constraint is a crucial factor in the sensor network because the sensor nodes are typically battery-run and it is impossible or difficult to recharge them in most application scenarios. Unbalanced data transference in the communication channel frequently produces an energy hole problem, which causes the premature death of the sensor nodes and reduces the network lifetime. To resolve this issue and improve the network lifetime, the proposed approach adjusts the transmission range according to the distances between the cluster heads and their members. Furthermore, a mobile data collector based on the firefly optimization algorithm is employed to increase the network lifetime. The proposed algorithm is compared with standard benchmark algorithms in several scenarios. The simulation results demonstrate that the proposed algorithm outperforms existing algorithms with respect to the network lifetime. 相似文献
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An optimum sensor node deployment in wireless sensor network can sense the event precisely in many real time scenarios for example forests, habitat, battlefields, and precision agriculture. Due to these applications, it is necessary to distribute the sensor node in an efficient way to monitor the event precisely and to utilize maximum energy during network lifetime. In this paper, we consider the energy hole formation due to the unbalanced energy consumption in many-to-one wireless sensor network. We propose a novel method using the optimum number of sensor node Distribution in Engineered Corona-based wireless sensor network, in which the interested area is divided into a number of coronas. A mathematical models is proposed to find out the energy consumption rate and to distribute the optimum number of sensor node in each corona according to energy consumption rate. An algorithm is proposed to distribute the optimum number of sensor nodes in corona-based networks. Simulation result shows that the proposed technique utilized 95 % of the total energy of the network during network lifetime. The proposed technique also maximizes the network lifetime, data delivery and reduce the residual energy ratio during network lifetime. 相似文献
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分析了基于低功耗自适应分簇(LEACH)路由协议的无线传感网络(WSN)在不同拓扑形状下的生命周期,并改进了长方形拓扑形状的路由协议。进而针对WSN在某些场合能量有限、易受干扰和安全性差等缺点,在长方形区域中引入分布式光纤传感结构。将传感光纤铺设在环境复杂和外界电磁波干扰大的监测区域,从而提高整个传感网络的生命周期和可靠性。理论分析和仿真结果表明,改进的拓扑和协议在提高可靠性的同时,有效地延长了光WSN的生存时间,性能优于传统LEACH协议。 相似文献
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A wireless sensor network is a network of large numbers of sensor nodes, where each sensor node is a tiny device that is equipped with a processing, sensing subsystem and a communication subsystem. The critical issue in wireless sensor networks is how to gather sensed data in an energy-efficient way, so that the network lifetime can be extended. The design of protocols for such wireless sensor networks has to be energy-aware in order to extend the lifetime of the network because it is difficult to recharge sensor node batteries. We propose a protocol to form clusters, select cluster heads, select cluster senders and determine appropriate routings in order to reduce overall energy consumption and enhance the network lifetime. Our clustering protocol is called an Efficient Cluster-Based Communication Protocol (ECOMP) for Wireless Sensor Networks. In ECOMP, each sensor node consumes a small amount of transmitting energy in order to reach the neighbour sensor node in the bidirectional ring, and the cluster heads do not need to receive any sensed data from member nodes. The simulation results show that ECOMP significantly minimises energy consumption of sensor nodes and extends the network lifetime, compared with existing clustering protocol. 相似文献
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Energy-aware wireless microsensor networks 总被引:5,自引:0,他引:5
Raghunathan V. Schurgers C. Sung Park Srivastava M.B. 《Signal Processing Magazine, IEEE》2002,19(2):40-50
This article describes architectural and algorithmic approaches that designers can use to enhance the energy awareness of wireless sensor networks. The article starts off with an analysis of the power consumption characteristics of typical sensor node architectures and identifies the various factors that affect system lifetime. We then present a suite of techniques that perform aggressive energy optimization while targeting all stages of sensor network design, from individual nodes to the entire network. Maximizing network lifetime requires the use of a well-structured design methodology, which enables energy-aware design and operation of all aspects of the sensor network, from the underlying hardware platform to the application software and network protocols. Adopting such a holistic approach ensures that energy awareness is incorporated not only into individual sensor nodes but also into groups of communicating nodes and the entire sensor network. By following an energy-aware design methodology based on techniques such as in this article, designers can enhance network lifetime by orders of magnitude 相似文献
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Muruganathan S.D. Ma D.C.F. Bhasin R.I. Fapojuwo A.O. 《Communications Magazine, IEEE》2005,43(3):S8-13
Wireless sensor networks consist of small battery powered devices with limited energy resources. Once deployed, the small sensor nodes are usually inaccessible to the user, and thus replacement of the energy source is not feasible. Hence, energy efficiency is a key design issue that needs to be enhanced in order to improve the life span of the network. Several network layer protocols have been proposed to improve the effective lifetime of a network with a limited energy supply. In this article we propose a centralized routing protocol called base-station controlled dynamic clustering protocol (BCDCP), which distributes the energy dissipation evenly among all sensor nodes to improve network lifetime and average energy savings. The performance of BCDCP is then compared to clustering-based schemes such as low-energy adaptive clustering hierarchy (LEACH), LEACH-centralized (LEACH-C), and power-efficient gathering in sensor information systems (PEGASIS). Simulation results show that BCDCP reduces overall energy consumption and improves network lifetime over its comparatives. 相似文献
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Mehdi Nazari Cheraghlou Ahmad Khadem-Zadeh Majid Haghparast 《Wireless Personal Communications》2017,92(2):603-622
The main application of wireless sensor networks is to monitor remote and dangerous areas that are inaccessible or difficult and or costly to reach by humans. This characteristic makes these networks be self-managed, face the challenges of fault tolerance and energy and network lifetime constraints due to non-renewable energy sources. In this paper, a management framework capable of providing and increasing network fault tolerance is introduced. To design such a framework, fault detection and recovery mechanisms for various fault levels including network nodes and communications between them have been used. The proposed management framework and protocols increase network’s fault tolerance capability in network nodes and in the communications between them. Also, the network lifetime increases three to five times more. On the one hand, it’s expected that the provision of network fault tolerance would decrease network’s lifetime and since it increases information exchange, it would increase energy consumption and cause reduced network life time, however the final results suggest a several-fold increase of network lifetime. 相似文献