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移动Adhoc网络的自组织、动态拓扑以及无线接入等特点使路由的安全性问题日益突出,而现有的Adhoc网络路由协议并没有提供安全的保护机制。论文首先论述了Adhoc网络几种常见的按需安全路由协议,指出有待解决的问题,在此基础上提出一种改进的、有效的安全路由协议(SEAR),阐述了该协议的路由请求、响应和维护的路由方式和过程,并通过协议间的比较分析其安全性和网络性能。该方案采用对称密钥协商和公钥认证方式,在兼顾性能资源的同时也保证了Adhoc网络的路由安全。 相似文献
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移动Ad Hoc网络的安全路由协议研究 总被引:2,自引:0,他引:2
ad hoc网络是一种新型的无线移动网络,因其独特的组网特性,使得安全问题成为其发展的最大束缚。路由协议的安全是自组网安全的一个重要部分。本文首先论述移动AdHoc网络中的安全问题,介绍了多种安全路由的协议和方案,并对其中的三种按需安全路由协议进行了比较,最后提出进一步研究AdHoc网络路由安全应注意的问题。 相似文献
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移动自组(Ad hoc)网络是现有网络的一种补充和扩展,它主要应用于缺乏网络基础设施的环境或者现有网络不能满足移动性、机动性等要求的情况。移动Ad hoc网络的特性使得它面临着比现有网络更大的安全挑战。首先介绍了移动Ad hoc网络的概念、特性及应用,接着探讨了移动Ad hoc网络中的安全漏洞以及相应的对策,最后讨论了今后移动Ad hoc网络安全问题的研究方向。 相似文献
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从路由安全性的角度出发,对无线Mesh网络中的多径路由(MPR)算法和随机路由(SR)算法进行了研究.在分析这两种算法的思路、实现步骤和安全性的基础上,对MPR算法和SR算法进行了仿真.仿真结果表示SR算法在路由安全性能上优于MPR算法,但在网络时延性能上劣于MPR算法. 相似文献
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移动Ad hoc网络中的安全问题 总被引:1,自引:0,他引:1
首先分析了Ad hoc网络存在的安全问题和安全目标。然后简单介绍了路由协议的安全隐患,接着详细讨论了Ad hoc网络的安全策略,最后说明了Ad hoc网络安全性面临的挑战。 相似文献
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Ad hoc网络的安全性问题越来越引起人们的关注,如何确保Ad hoc网络路由协议的安全成为Ad hoc研究的一项关键技术。本文介绍了安全协议的目标以及针对Ad hoc网络路由协议的恶意攻击,接着详细分析了目前比较典型的几种Ad hoc网络安全路由的研究现状,在对他们进行综合比较的基础上指出了存在的问题。 相似文献
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Ad hoc网络的安全性问题越来越引起人们的关注,如何确保Ad hoc网络路由协议的安全成为Ad hoc研究的一项关键技术.本文介绍了安全协议的目标以及针对Ad hoc网络路由协议的恶意攻击,接着详细分析了目前比较典型的几种Adhoc网络安全路由的研究现状,在对他们进行综合比较的基础上指出了存在的问题. 相似文献
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首先分析了Adhoc网络存在的安全问题和安全目标。然后简单介绍了路由协议的安全隐患,接着详细讨论了Adhoc网络的安全策略,最后说明了Adhoc网络安全性面临的挑战。 相似文献
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提出了无线自组织网络中一种拥塞意识的多径路由算法。该算法在路由发现过程中,综合节点的队列长度和路径跳数来动态确定路由请求消息的转发概率,可以在保证路由请求消息有一定送达率的条件下,降低路由开销;在路径选择和流量分配过程中,综合考虑节点的队列长度和路径质量作为路由度量,发现流量高吞吐量低拥塞路径,并基于该度量值进行流量分配。仿真结果显示,所提出的多径路由算法能有效提高网络性能。 相似文献
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ABRP: Anchor-based Routing Protocol for Mobile Ad Hoc Networks 总被引:2,自引:0,他引:2
Ad hoc networks, which do not rely on any infrastructure such as access points or base stations, can be deployed rapidly and
inexpensively even in situations with geographical or time constraints. Ad hoc networks are attractive in both military and
disaster situations and also in commercial uses like sensor networks or conferencing. In ad hoc networks, each node acts both
as a router and as a host. The topology of an ad hoc network may change dynamically, which makes it difficult to design an
efficient routing protocol. As more and more wireless devices connect to the network, it is important to design a scalable
routing protocol for ad hoc networks. In this paper, we present Anchor-based Routing Protocol (ABRP), a scalable routing protocol
for ad hoc networks. It is a hybrid routing protocol, which combines the table-based routing strategy with the geographic
routing strategy. However, GPS (Global Positioning System) (Kaplan, Understanding GPS principles and Applications, Boston:
Artech House publishers, 1996) support is not needed. ABRP consists of a location-based clustering protocol, an intra-cell
routing protocol and an inter-cell routing protocol. The location-based clustering protocol divides the network region into
different cells. The intra-cell routing protocol routes packets within one cell. The inter-cell routing protocol is used to
route packets between nodes in different cells. The combination of intra-cell and inter-cell routing protocol makes ABRP highly
scalable, since each node needs to only maintain routes within a cell. The inter-cell routing protocol establishes multiple
routes between different cells, which makes ABRP reliable and efficient. We evaluate the performance of ABRP using ns2 simulator.
We simulated different size of networks from 200 nodes to 1600 nodes. Simulation results show that ABRP is efficient and scales
well to large networks. ABRP combines the advantages of multi-path routing strategy and geographic routing strategy—efficiency
and scalability, and avoids the burden—GPS support. 相似文献
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移动Ad hoc网络中,节点随机移动会引起通信链路频繁断开,从而导致路由失效,带来大量的路由重建与路由发现,耗费了有限的网络资源。传统按需路由中,采用简单的洪泛进行路由发现,路由请求包的盲目转发会带来大量不必要的冗余转发,造成广播风暴问题。此外,大量的数据包同时发送也会对彼此的传输造成干扰,增加数据包冲突概率。针对这种情况,本文提出一种基于干扰和连通度的路由协议,该协议结合节点的连通度和潜在干扰设计转发概率,不仅减少了路由请求包的传播范围,还减少了路由请求包的冲突概率,提高了传输成功率。仿真结果表明,本文设计的方案在减少路由开销的同时,有效提高了数据包投递率,从而提高了路由性能。 相似文献
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Performance of Multipath Routing for On-Demand Protocols in Mobile Ad Hoc Networks 总被引:25,自引:0,他引:25
Mobile ad hoc networks are characterized by multi-hop wireless links, absence of any cellular infrastructure, and frequent host mobility. Design of efficient routing protocols in such networks is a challenging issue. A class of routing protocols called on-demand protocols has recently found attention because of their low routing overhead. The on-demand protocols depend on query floods to discover routes whenever a new route is needed. Such floods take up a substantial portion of network bandwidth. We focus on a particular on-demand protocol, called Dynamic Source Routing, and show how intelligent use of multipath techniques can reduce the frequency of query floods. We develop an analytic modeling framework to determine the relative frequency of query floods for various techniques. Our modeling effort shows that while multipath routing is significantly better than single path routing, the performance advantage is small beyond a few paths and for long path lengths. It also shows that providing all intermediate nodes in the primary (shortest) route with alternative paths has a significantly better performance than providing only the source with alternate paths. We perform some simulation experiments which validate these findings. 相似文献
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This paper presents the design and evaluation of a highly efficient on-demand multicast routing protocol for mobile ad hoc
networks (MANETs). The protocol, called Geography-aided Multicast Zone Routing Protocol (GMZRP), eliminates as much as possible
duplicate route queries by using a simple yet effective strategy for propagating the multicast route request (MRREQ) packets.
GMZRP is the first hybrid multicast protocol taking the advantages of both topological routing and geographical routing. It
partitions the network coverage area into small zones and guarantees that each geographic zone is queried only once. GMZRP
maintains a multicast forwarding tree at two levels of granularities, i.e., the zone granularity and the node granularity.
By doing this, it can easily handle route breakage since the zone level information can help recover the link failure at the
node level. The results of the performance evaluation of GMZRP using simulation show that, comparing with the well-known multicast
protocol ODMRP (On-Demand Multicast Routing Protocol), GMZRP has much lower protocol overhead in terms of query packets and,
meanwhile, achieves competing packet delivery ratio and shorter delivery latency.
相似文献
Xiaopeng FanEmail: |
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The main purposes of this article are to relieve broadcast problem, to immunize to some prerequisites, and to reduce the number of transmitted control packets. Broadcasting control packets network-wide is the most direct and common method for finding the required destination node in ad hoc mobile wireless networks; however, this causes a lot of waste of wireless bandwidth. To remedy the problem, routing protocols demanding some prerequisites are proposed; nonetheless, hardly can they be used if these prerequisites are missed or become stale. To efficiently reduce the number of transmitted control packets, our routing protocol partitions the network into interlaced gray districts and white districts by the aid of GPS and inhibits an intermediate node residing in a white district from re-transmitting the received control packets. However, a mobile node residing in a gray district is responsible for re-transmitting them till they reach the destination node. Our routing protocol does not demand any prerequisite except the use of GPS. Each mobile node can always obtain its own location information; furthermore, the information may neither be missed nor become stale. Our routing protocol is easy to be implemented, saves precious wireless bandwidth, and reduces almost half a number of control packets as compared with pure flooding routing protocols.Ying-Kwei Ho received the B.S. degree and M.S. degree in applied mathematics and in electrical engineering from the Chung-Cheng Institute of Technology in 1987 and 1993 respectively and the Ph.D. degree in computer engineering and science from the Yuan-Ze University, Taiwan, R.O.C. He joined the Army of Taiwan, R.O.C. in 1987 and worked as a software engineer. From 1993 to 1997, he was an instructor in the War Game Center of Armed Forces University, Taiwan, R.O.C. He is currently an assistant professor of the Department of Computer Science at Chung-Cheng Institute of Technology. His research interests include mobile computing, wireless network performance simulation and evaluation, and modeling and simulation.Ru-Sheng Liu received the B.S. degree in electrical engineering from the National Cheng-Kung University, Taiwan, in 1972 and the M.S. and Ph.D. degrees in computer science from the University of Texas at Dallas, Richardson, Texas, in 1981 and1985, respectively. He is currently an associate professor in the Department of Computer Engineering and Science at Yuan-Ze University, Chungli, Taiwan. His research interests are in the areas of mobile computing, internet technology, and computer algorithms. 相似文献
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曹常义 《电信工程技术与标准化》2002,(5):13-19
Ad hoc技术是从无线移动Ad hoc网络(WMANET)抽象出来的一个一般性概念,该项技术所标称的是自组识、多跳的一个临时分布式系统,是一种网络构架技术。它要面临多项难题。本文就是从OSI模型的角度把Ad hoc技术分层介绍,最后给出了一种WMANET应用方案。 相似文献