共查询到20条相似文献,搜索用时 25 毫秒
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针对大规模无线传感器网络(WSN)流量随访问者数量增加而上升的问题,设计并实现了一种适用于构建大型WSN并降低系统流量的应用系统框架。系统采用IPv6和低功耗无线个域网的IPv6技术(6LoWPAN)搭建大规模WSN,使用消息队列遥测传输(MQTT)协议和针对WSN设计的消息队列遥测传输(MQTT-SN)协议在应用层搭建了连接WSN和传统互联网的发布/订阅结构。实验结果显示,当系统中存在5个传感器节点时,与受限应用协议(CoAP)构建的WSN应用系统相比,提出的系统框架的数据流量仅为前者的18%左右。这表明该系统框架可有效地控制访问者增加对WSN流量造成的影响。 相似文献
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Saamaja Vupputuri Kiran K. Rachuri C. Siva Ram Murthy 《Journal of Parallel and Distributed Computing》2010
In this paper, we focus on maximizing network lifetime of a Wireless Sensor Network (WSN) using mobile Data Collectors (DCs) without compromising on the reliability requirements. We consider a heterogeneous WSN which consists of a large number of sensor nodes, a few DCs, and a static Base Station (BS). The sensor nodes are static and are deployed uniformly in the terrain. The DCs have locomotion capabilities and their movement can be controlled. Each sensor node periodically sends sensed event packets to its nearest DC. The DCs aggregate the event packets received from the sensor nodes and send these aggregate event packets to the static BS. We address the following problem: the DCs should send the aggregate event packets to the BS with a given reliability while avoiding the hotspot regions such that the network lifetime is improved. Reliability is achieved by sending each aggregate event packet via multiple paths to the BS. The network lifetime is maximized by moving the DCs in such a way that the forwarding load is distributed among the sensor nodes. We propose both centralized and distributed approaches for finding a movement strategy of the DCs. We show via simulations that the proposed approaches achieve the required reliability and also maximize the network lifetime compared to the existing approaches. 相似文献
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无线传感器网络(Wireless sensor networks)是随机分布的传感器节点通过分布式协议自组织方式形成的网络,网络管理是保障无线传感器网络稳定、可靠、高效运行的重要条件。讨论研究了现有无线传感器网络管理技术,并结合无线传感器网络的特点和实际需求,在已有IPv6无线传感器网络底层协议及SNMP(简单网络管理协议)的基础上,设计和实现了一个切实可行的符合无线传感器网络特点的节点信息管理平台,以实现用户对无线传感器网络的远程有效管理。 相似文献
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Shu-Ching Wang Kuo-Qin Yan Shun-Sheng Wang Guang-Yan Zheng 《Parallel and Distributed Systems, IEEE Transactions on》2008,19(9):1252-1262
Fault-tolerance is an important research topic in the study of distributed systems. To cope with the influence of faulty components, reaching a common agreement in the presence of faults before performing certain tasks is essential. However, the Byzantine Agreement (BA) problem is a fundamental problem in fault-tolerant distributed systems. In previous studies, protocols dealing with the BA problem focused on static networks; however, these do not perform well in dynamically changing mobile networks. The most well known mobile network is the Mobile Ad-hoc Network (MANET). To enhance fault-tolerance and MANET reliability, the BA problem in virtual subnets of MANET is revisited in this paper. The proposed protocol is called the Hybrid Agreement Protocol (HAP). It achieves agreement on a common value among all functional mobile processors in a minimal number of message exchange rounds, and can tolerate a maximal number of allowable faulty components in the virtual subnet of MANET. 相似文献
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无线传感器网络(Wireless Sensor Network,WSN)在实现万物互联的同时,无线通信安全面临挑战。WSN网络节点随机分散部署,网络结构动态变化,使得现有安全通信方案无法直接应用。针对该问题,应用随机泊松点过程对网络节点进行位置建模,以安全中断概率、连接中断概率为指标,应用随机几何工具对无线传感网系统的物理层安全性能展开分析。仿真验证了理论分析的正确性,仿真结果表明通过合理布置传感器节点密度可使系统安全可靠性能达到最佳。 相似文献
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针对大规模无线传感器网络(WSN)中故障检测准确率降低,并产生较大通信负载的问题,根据传感器节点的时空相关性特点,提出一种基于簇的分布式传感器故障检测算法。通过邻居节点间的数据交换和互相测试检测簇首节点,并以正常簇首节点作为参照诊断故障节点。性能分析与实验结果表明,在大规模WSN中,该算法具有良好的故障检测能力和较低的通信负载,在邻居节点数较少、节点故障率较高的情况下,能达到98%以上的故障检测准确率,并保持较低的能耗水平。 相似文献
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针对无线传感器网络(WSN)中基于数字签名的公钥加密体制的广播认证需要耗费大量的能量,以及传感器节点资源有限的问题,为了减少传感器节点的能量耗费和加快传感器节点的认证,提出一种传感器节点相互协作的广播认证方案。首先,用户向无线传感器网络的组网络广播其签名信息,但不广播签名信息中点的纵坐标;然后,组网络中的高能量节点依据点的横坐标和椭圆曲线方程计算得出纵坐标,并将其广播给组内的一般节点,同时利用vBNN-IBS数字签名对用户广播的签名信息进行认证,并转播有效的签名信息;最后,组网络内的一般节点收到纵坐标后,利用椭圆曲线方程验证其有效性和正确性,同时执行和高能节点相同的签名认证过程,并转播有效的签名信息。此外,该方案通过整合立即撤销和自动撤销以最大限度地减小授权撤销列表(ARL)的长度。仿真实验表明,当认证节点收到来自邻居节点的数据包达到一定数目时,该方案的能量耗费和认证总时间比利用WSN中传感器节点间的相互协作来加速vBNN-IBS的签名方案分别减少了41%和66%。 相似文献
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针对无线传感器与执行器网络(WSAN)的传感器节点定位问题,提出了一种基于虚拟力的无线传感器与执行器网络测距定位算法,使用移动的执行器节点替代传统无线传感器网络(WSN)定位算法中的锚节点,并将虚拟力模型引入基于信号到达时间(TOA)的定位算法。该算法在利用虚拟力驱动执行器节点逼近提出定位请求的传感器节点的同时,根据信号传输时间计算节点间的距离完成节点定位。仿真结果表明,提出的定位算法使得节点定位成功率提高20%左右,平均定位时间以及定位开销均小于传统TOA算法,适用于实时性要求高、执行器节点数量较少的场合。 相似文献
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基于无线传感器网络的环境监测系统研究与设计 总被引:5,自引:1,他引:4
李忠成 《计算机测量与控制》2008,16(7):929-931,958
为了改善传统的环境监测系统因采用有线网络连接方式而导致的可靠性差、易受损、失效快等问题,引入无线传感器网络(WSN)技术,提出一种基于无线传感器网络的通用综合环境监测系统解决方案;通过对无线传感器网络特点和应用的研究,并参考环境监测系统的现状,结合无线传感器网络技术、嵌入式系统技术和网络通信技术研究和设计了一套适用于多种场合和环境的无线传感器网络环境监测系统;该系统不但有效地克服了传统系统的低可靠性问题,而且增加了新的监测功能,是一套完整、可行的系统。 相似文献
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Soledad Escolar Díaz Florin Isaila Alejandro Calderón Mateos Luis Miguel Sanchez García David E. Singh 《The Journal of supercomputing》2010,51(1):76-93
In the last years the Wireless Sensor Networks’ (WSN) technology has been increasingly employed in various application domains.
The extensive use of WSN posed new challenges in terms of both scalability and reliability. This paper proposes Sensor Node
File System (SENFIS), a novel file system for sensor nodes, which addresses both scalability and reliability concerns. SENFIS
can be mainly used in two broad scenarios. First, it can transparently be employed as a permanent storage for distributed
TinyDB queries, in order to increase the reliability and scalability. Second, it can be directly used by a WSN application
for permanent storage of data on the WSN nodes. The experimental section shows that SENFIS implementation makes an efficient
use of resources in terms of energy consumption, memory footprint, flash wear levelling, while achieving execution times similarly
with existing WSN file systems. 相似文献
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针对层次型无线传感网络(HSN)中的安全通信问题,提出了一种基于逻辑密钥树(LKH++)的组密钥管理方案——W-LKH++。针对无线传感器节点的低配置特点,首先,对LKH++树的组密钥初始化计算方法进行修改,降低传感器节点的计算消耗;其次,对LKH++的组密钥持有方式进行改进,减少传感节点的存储消耗;最后,提出适用于簇头节点的动态密钥更新方法,在降低通信消耗的基础上增强簇头节点的抗捕获能力,提高无线通信网络的安全性。性能分析和仿真实验结果表明,W-LKH++在保证低计算、存储和通信消耗的基础上,进一步提高了网络安全性。 相似文献
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