共查询到19条相似文献,搜索用时 203 毫秒
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无线传感器网络节点采用电池供电,能量有限。很多情况下电池无法更换,网络中的节点会因能量耗尽而失效。节点的主要能耗是网络通信开销,因此,设计低能耗的网络协议成为无线传感器网络研究的核心问题之一。描述了无线传感器网络的主要能量消耗来源,介绍了Cross-layer设计思想和协议结构,对在Cross-layer框架下开发相关网络协议的能量有效性进行了必要的分析。 相似文献
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无线传感器网络中,传感器节点的能量、存储和计算能力有限,且无线传感器网络具有数据链路不对称、拓扑易变化等特点,设计节能可靠的网络协议是困难的。设计良好的网络协议不仅能降低网络的负载,还有助于节省传感器节点的能量,从而延长网络的生存周期。在无线传感器网络操作系统TinyOS平台上实现了基于RS纠删码的信息分发协议,并理论分析了在单跳情况下的协议性能,最后在仿真环境TOSSIM上模拟比较了在多跳、多路径情况下该信息分发协议和洪泛分发协议的性能。模拟仿真表明,提出的基于RS纠删码的信息分发协议明显减少了发送方发送数据包的数量,同时提高了节点的报文接收率,从而达到了降低网络能耗的目的。 相似文献
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为了延长无线传感器网络的生命周期,进行了无线传感器网络中节能路由协议的探索性研究,提出了一种新的节能路由协议并将其具体实现.首先分析了传感器网络应用的特点以及设计和应用中的限制,综述了现有传感器网络中节能路由设计的方法,设计并实现了一种基于能量的半径自适应路由协议ERARP;然后在OPNET仿真平台上对该协议进行了仿真模拟;最后与无线传感器网络传统的两种节能路由协议基于信息协商的传感器网络协议和直接扩散协议在同等条件下针对节点能量使用、延迟、丢包率和吞吐量等四个性能评价指标进行了对比.结果表明,ERARP使得节点能够根据自身剩余能量的状况对节点的运行模式进行控制,同时对无线模块的收发半径进行动态调整,达到节能目的. 相似文献
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一种节能的无线传感器网络路由协议的设计与实现 总被引:1,自引:0,他引:1
在无线传感器网络的路由协议中,基于簇的路由协议在拓扑管理、能量利用、数据融合等方面具有优势。本文针对目前已有协议能量消耗大、网络寿命短等问题,提出了一种能量感知的基于分布式簇算法的无线传感器网络协议EA-HEED。此协议改进了分布式的簇头选举算法,分配时分复用时隙并在簇头节点建立一棵路由树,从而提高簇头选举效率;设计了休眠冗余节点的簇内活动节点调度算法,减少能耗;采用考虑节点能量和节点与基站距离的簇头节点组织路由树方法、最小化网络开销以及能量负载平衡方法,优化路由协议,有效延长网络寿命。仿真结果表明,与LEACH和HEED协议相比,EAHEED协议可以进一步延长网络寿命。 相似文献
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针对无线传感器网络寿命受节点能量制约的问题,提出一种面向环境监测应用的无线传感器网络协议。利用该协议建立临时虚电路预约机制,由控制中心启动和控制数据传输的操作,实现无冲突策略。控制中心通过下发唤醒时间安排随时调整占空比,由此节省网络能耗。实验结果表明,该协议能降低节点能耗,延长网络生命周期。 相似文献
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无线移动自组网中的大多数节点都是由有限寿命的电池来提供的,能量保护策略就成为设计网络协议的一个重要条件。提出一种能量感知的无线移动自组网路由协议,综合考虑了节点的剩余能量和路由跳数,有效保护网络中能量低的节点,减少了节点能量损耗,延长了网络的使用时间。该路由协议中采用了局部路由修复机制,减少了数据包丢失,提高了数据传输率。最后,仿真结果证明了协议的有效性。 相似文献
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传感器节点体积微小,通常携带能量十分有限的电池。由于传感器节点个数多,成本要求低廉,分布区域广,而且部署区域环境复杂,有些区域甚至是人员不能到达的,所以传感器节点通过更换电池的方式来补充能量是不现实的。如何高效使用能量来最大化网路的生命周期是无线传感器网络面临的首要挑战。为了提高网络的寿命,目前人们已经提出了很多基于网络层的路由协议。比较研究了传感器网络现有的路由协议,参考LEACH分簇算法和MTP协议,提出了一种在MTP协议基础上将LEACH分簇思想引入进来的改进方法,即在基于能量强度将网络节点分层后,再在各层上进行簇区分,均衡各传感器节点的能量来提高网络的寿命。实验表明该路由算法可提高网络寿命。 相似文献
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为了将无线传感器网络应用于冶金企业中的设备监测,根据冶金现场的特殊环境,提出一种低功耗的TDMA网络协议,该协议采用了簇头轮换的能量均衡策略,在保证有效采样率的条件下使更多节点进入休眠状态以节省能量.实验证明了该协议有效的延长了无线传感器监测网络的生存时间,并且具有可靠的数据查询报告.基于该协议开发的网络系统已很好的应用于钢铁厂的温度监测中. 相似文献
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由于无线传感器网络(WSN)节点的能量有限,因此尽量减少各节点的能量消耗,延长整个网络的生命周期,是无线传感器网络路由协议设计中考虑的主要问题。文章提出了一种改进的SPIN路由协议,取名为SPIN-Z,与现有的SPIN协议比较,其主要特点是通过减少整个网络冗余数据的传输来减少能量消耗。在NS2环境下进行仿真,结果表明SPIN-Z协议比SPIN协议更加节省能量。 相似文献
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Wireless sensor networks are composed of a large number of sensor nodes with limited energy resources. One critical issue in wireless sensor networks is how to gather sensed information in an energy efficient way since the energy is limited. The clustering algorithm is a technique used to reduce energy consumption. It can improve the scalability and lifetime of wireless sensor network. In this paper, we introduce an adaptive clustering protocol for wireless sensor networks, which is called Adaptive Decentralized Re-Clustering Protocol (ADRP) for Wireless Sensor Networks. In ADRP, the cluster heads and next heads are elected based on residual energy of each node and the average energy of each cluster. The simulation results show that ADRP achieves longer lifetime and more data messages transmissions than current important clustering protocol in wireless sensor networks. 相似文献
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《Computer Communications》2007,30(14-15):2774-2785
Wireless sensor network consists of large number of sensor nodes with limited battery power, which are randomly deployed over certain area for several applications. Due to limited energy resource of sensors, each of them should minimize the energy consumption to prolong the network lifetime. In this paper, a distributed algorithm for the multi-hop wireless sensor network is proposed to construct a novel energy efficient tree topology, without having location information of the nodes. Energy conservation of the nodes is accomplished by controlling transmission power of the nodes. Besides, maintenance of the network topology due to energy scarcity of the gateway nodes is also proposed in the protocol. Simulation results show that our distributed protocol can achieve energy conservation up to an optimum level similar to the centralized algorithm that we have considered and can extend the network lifetime as compared to other distributed algorithms without any power control. 相似文献
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基于S-MAC协议改进,利用虚拟簇之间边界节点的调度信息,采用能量有效的二次监听和灵活的调度自适应两个主要方法,设计一种能量有效的移动无线传感器网络MAC协议(EM-MAC),能实现移动节点更有效的更快速的睡眠——唤醒调度自适应。仿真结果表明该协议用于移动无线传感器网络,在能耗、延迟等性能方面有较好提高。 相似文献
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《Computer Communications》2007,30(11-12):2401-2412
A Wireless Sensor Network (WSN) is a collection of wireless sensor nodes forming a temporary network without the aid of any established infrastructure or centralized administration. In such an environment, due to the limited range of each node’s wireless transmissions, it may be necessary for one sensor node to ask for the aid of other sensor nodes in forwarding a packet to its destination, usually the base station. One important issue when designing wireless sensor network is the routing protocol that makes the best use of the severely limited resource presented by WSN, especially the energy limitation. Another import factor required attention from researchers is providing as much security to the application as possible. The proposed routing protocols in the literature focus either only on increasing lifetime of network or only on addressing security issues while consuming much power. None of them combine solutions to the two challenges. In this paper, we propose a new routing protocol called SEEM: Secure and Energy-Efficient multipath Routing protocol. SEEM uses multipath alternately as the path for communicating between two nodes thus prolongs the lifetime of the network. On the other hand, SEEM is effectively resistive to some specific attacks that have the character of pulling all traffic through the malicious nodes by advertising an attractive route to the destination. The performance of our protocol is compared to the Directed Diffusion protocol. Simulation results show that our protocol surpasses the Directed Diffusion protocol in terms of throughput, control overhead and network lifetime. 相似文献