共查询到20条相似文献,搜索用时 15 毫秒
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随着微机电系统、无线通信、嵌入式计算、微型传感器及集成电路等技术的飞速发展,无线传感器网络应运而生.由于无线传感器网络的广阔应用前景,它已经成为21世纪的一个新研究领域.从功能的角度分析了无线传感器网络当前研究热点,并对相关技术进行深入剖析,讨论了目前存在的问题和需要进一步研究的方向. 相似文献
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移动自组织网络中一种基于多点中继策略的优化泛洪广播算法 总被引:1,自引:0,他引:1
多点中继(multipoint relaying,MPR)是一种有效的移动ad hoc网络即时泛洪广播策略.选择尽量少的邻节点以覆盖2跳(2-hop)范围内所有节点是MPR策略的关键.然而现有的基于MPR策略的泛洪算法忽视了转发节点之间所存在的共有邻接关系对结果的影响.在分析转发节点之间连接拓扑关系的基础上,发现尚未被覆盖的2跳节点集合的势(cardinality)可以进一步压缩,从而进一步减少冗余的转发节点.同时,讨论了利用自裁减(self-pruning)提升MPR性能的可能性.据此提出了基于共有邻接关系消除的自裁减辅助MPR优化泛洪广播算法(ECARSP).理论分析和实验结果表明,ECARSP在转发节点数量和网络负载等方面均要优于现有的移动ad hoc网络MPR泛洪算法. 相似文献
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As wireless LANs and wireless terminals deployed, security and authentication, among other things, became important. We propose a mutual authentication scheme for access security among wireless terminals. We use user identification together with hardware identification in creating a certificate for the wireless access. And authentication is performed based on the certificate. It enables reliable user authentication, establishment and check of access rights (when a terminal is managed in connection with a network gateway), Peer-to-Peer access with authentication, and international roaming of terminals.This work was supported by the Korea Research Foundation Grant (KRF-2004-005-D00198). 相似文献
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无线自组网AODV路由协议的实现 总被引:1,自引:0,他引:1
简要描述了无线自组网中的研究热点之一AODV路由协议的算法,然后设计了一种兼容传统TCP/IP、支持广播和单播两种数据通信服务的实现体系.详细介绍了实现的具体细节,经测试和评估表明,该实现体系能够高效地创建和维护路由. 相似文献
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Mobile ad hoc networks (MANETs) are gaining popularity in recent years due to their flexibility, the proliferation of smart computing devices, and developments in wireless communications. Clustering is an important research problem for MANETs because it enables efficient utilization of resources, and must strike a delicate balance between battery energy, mobility, node degree, etc. In this paper, we consider the typical communication workload of every mobile node as well as the additional communication workload of clusterheads in MANET clustering. We propose an algorithm that optimizes communication workload, power consumption, clusterhead lifetime, and node degree. Experiment results show that our clustering approach produces effectively balanced clusters over a diverse set of random scenarios. 相似文献
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As wireless LANs and wireless terminals deployed, security and authentication, among other things, became important. We propose
a mutual authentication scheme for access security among wireless terminals. We use user identification together with hardware
identification in creating a certificate for the wireless access. And authentication is performed based on the certificate.
It enables reliable user authentication, establishment and check of access rights (when a terminal is managed in connection
with a network gateway), Peer-to-Peer access with authentication, and international roaming of terminals.
This work was supported by the Korea Research Foundation Grant (KRF-2004-005-D00198). 相似文献
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一种安全的Ad Hoc网络路由协议SGSR 总被引:3,自引:0,他引:3
Ad Hoc网络作为一种无线移动网络,其安全问题,特别是路由协议的安全备受关注。针对现有适合移动Ad Hoc网络的链路状态路由协议GSR无法防范恶意节点伪造、篡改、DoS攻击的现状,本文提出了一种在移动Ad Hoc网络中抵抗单个节点恶意攻击的安全路由协议SGSR,给出了认证协议的形式化证明,并对路由协议进行仿真和性能分析。 相似文献
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提出了一种基于分布式实时信息的车载自组织网络路由协议(distributed real-time information based routing protocol,简称DRIP).网络中,车辆基于提出的分布式实时路段延时估计机制(distributed real-time delay evaluation scheme,简称DRES)获取各路段网络状态的实时信息,车辆根据对各路段网络延时的实时估计,采用DRIP协议,保证了数据的有效传递.与现有协议相比,DRIP在最低限度消耗资源的情况下,具有实时性和高效性的特点.通过仿真实验对比现有协议,验证了DRIP在性能上的优越性. 相似文献
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Content-Centric Networking (CCN) is a candidate future Internet architecture that gives favourable promises in distributed wireless environments. The latter ones seriously call into question the capability of TCP/IP to support stable end-to-end communications, due to lack of centralized control, node mobility, dynamic topologies, intermittent connectivity, and harsh signal propagation conditions. The CCN paradigm, relying on name-based forwarding and in-network data caching, has great potential to solve some of the problems encountered by IP-based protocols in wireless networks.In this paper, we examine the applicability of CCN principles to wireless networks with distributed access control, different degrees of node mobility and resource constraints. We provide some guidelines for readers approaching research on CCN, by highlighting points of strength and weaknesses and reviewing the current state of the art. The final discussion aims to identify the main open research challenges and some future trends for CCN deployment on a large scale. 相似文献
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针对Ad hoc网络的特点,提出了一种基于分簇的分布式密钥管理方案。该方案在簇内采用贡献份额的思想,由部署信息直接派生节点间的端端密钥;在簇间,由节点协商产生共享密钥。经分析表明,该方案避免了单点失效,对拓扑结构动态变化的网络适应性强,比传统方案更高效、更安全。 相似文献
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介质访问控制协议在很大程度上决定了无线自组网的性能。本文在介绍CTMAC协议的基础上对该协议的并发规则进行了证明,并从理论上讨论了CTMAC协议的开销。通过模拟并与IEEE802.11和MACA-P比较表明,CTMAC协议可以有效地提高网络吞吐量。 相似文献
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为了充分发挥超宽带高速率的特性,本文具体设计了Ad Hoc网络距离辅助的QoS路由。该路由协议主要考虑了传输速率和端到端时延这两个QoS参数,综合考虑路由的跳数和带宽来选择路由,并利用超宽带的精确测距能力及时切换路由,保证了高速业务能够稳定进行。本文给出了路由协议中路由发现、路由选择和建立以及路由维护的详细过程,最后通过使用OPNET仿真验证了协议的性能。仿真结果表明,该协议比DSR协议在吞吐量和平均时延上有所改进。 相似文献
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在无线网络中,无线传输导致节点之间的通信容易被恶意节点捕获,进行通信分析,得到节点身份和位置等重要信息,从而展开有效的主动攻击。现在研究Ad Hoe网络安全的文章很多,但很少有考虑到匿名问题。本文提出了安全匿名按需路由协议SAODRP,保证了路由安全形成和维护及数据安全传输,同时也满足了匿名性要求,使恶意节点难以进行攻击。 相似文献
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干扰是严重影响Ad hoc网络的网络吞吐率主要原因之一。已有的基于网络链路和路径的局部干扰优化算法并未考虑网络中准瓶颈节点对网络干扰的影响,准瓶颈节点不仅影响网络的吞吐率,还可能破坏网络的连通性。利用分布式算法找出准瓶颈节点,构建链路干扰度的本地最小生成树,提出一种新的干扰优化拓扑控制算法(Quasi-bottleneck node-based Interference-optimization Algorithm,QIA),有效地降低准瓶颈节点对网络的干扰。仿真实验结果表明,QIA算法在保证网络连通性的前提下,降低了网络干扰。该算法同经典干扰优化拓扑控制算法相比,网络吞吐率提高了约10%~30%。 相似文献