基于稳定性和能量损耗率的改进AODV路由协议

文章在传统AODV路由协议基础上综合考虑了网络拓扑的稳定性和节点能量损耗率,提出了一种能够有效的提高报文投递成功率和网络生存时间的路由协议SE-AODV。改进的SE-AODV路由协议中文在各项性能指标上相较于传统AODV路由协议有较好的提升。NS2仿真结果也表明,SE-AODV路由协议在很大程度上提高了网络性能。     

MANET网络中改进本地修复机制的AODV路由协议

针对移动AdHoc网络中,AODV路由协议在本地修复过程中存在路由发现币口路由维护的巨大开销。提出了一种改进本地修复机制的AODV路由协议。通过OPNET分别对普通AODV协议和提出的改进本地修复机制的AODV路由协议进行仿真。仿真结果表明,该机制有效地减少了路由开销和端到端的数据传输延时,提高了协议效率和整个网络的性能。     

MANET网络中改进本地修复机制的AODV路由协议

针对移动Ad Hoc网络中,AODV路由协议在本地修复过程中存在路由发现和路由维护的巨大开销,提出了一种改进本地修复机制的AODV路由协议.通过OPNET分别对普通AODV协议和提出的改进本地修复机制的AODV路由协议进行仿真.仿真结果表明,该机制有效地减少了路由开销和端到端的数据传输延时,提高了协议效率和整个网络的性能.     

一种基于AODV路由协议的分簇算法研究

基于距离向量的按需路由协议AODV是AdHoc网络研究的热点之一。该协议有效减少了建立和维护路由所需要的开支,但是随着网络节点发送数据量的增加,网络性能会迅速下降。为了提高AdHoc网络的路由效率和可靠性,文章提出了一种基于AODV路由协议的分簇算法。经仿真研究分析表明,该算法提高了网络节点的平均每跳吞吐率,减少了节点的平均每跳时延。     

AODV路由协议的改进算法

无线Ad hoc网络拓扑结构动态变化的特点,决定了路径断裂是不可避免的。路径断裂会引起源节点路由重建,源节点频繁地发起路由重建过程会降低网络的性能。AODV协议中采用本地修复机制来减少源节点路由重建的次数。基于这一思想,文章提出了一种AODV路由协议改进算法SRP,旨在进一步提高本地修复的成功率。仿真结果表明,在拓扑结构变化迅速的Ad hoc网络中,SRP协议比AODV路由协议有更好的网络性能。     

基于缓存队列的减少拥塞的Ad hoc路由算法

AODV路由协议为了快速地建立路由,允许拥有积极路由的中间节点响应路由请求,而不考虑该节点当时的负荷,容易造成节点拥塞丢包。针对这一问题,文章在AODV的基础上,提出了根据缓存队列长度选择路径的AODV_Q路由协议,优先选择负荷较轻的中间节点,使数据流不在某些节点上过于集中。另外,AODV_Q还引入路由回复应答机制,提高路由回复包的送达率。仿真结果表明AODV_Q明显优于AODV,能在吞吐量、延时、丢包率等方面综合提高网络性能。     

基于Hello消息和MAC层协作的AODV路由改进

AODV是一个比较成熟并被广泛接受的移动自组织网络路由协议,实现起来比较简单,但在网络拓扑快速变化时,采用此协议会产生大量的控制信息,增加网络的协议开销,从而引起网络带宽资源和能量资源消耗的增加,网络的其他性能也将受到影响。文中通过优化Hello消息并与MAC层合作对传统的AODV路由协议进行了改进,提出了一种改进后的AODV路由算法:MAC-AODV路由算法。仿真表明MAC-AODV路由算法相对传统AODV路由算法减少了协议开销,提高了网络性能。     

基于802.11 MAC的移动Ad Hoc网络AODV路由协议改进算法

基于802.11的Ad Hoc网络AODV路由协议会引入通信盲区问题,使路由发现信息建立的路由不能很好地满足高速数据分组的传输,本文在传统通信盲区解决方案的基础上提出一种AODV路由协议改进算法.Opnet仿真表明,改进算法能有效地提高Ad-hoc网络性能.     

基于自愈性的无线Mesh网路由协议的研究

在AODV-BR路由协议的基础上提出了一种前摄式路由机制,旨在提高无线Mesh网络的快速自愈的能力。首先介绍了传统AODV路由协议中的本地修复算法,然后介绍了一种典型的前摄式AODV路由协议——AODV—BR路由协议,并指出了AODV-BR路由协议的不足,然后提出了改进的前摄式路由协议（AODV—RP）。     

一种基于缓存技术的改进型AODV路由协议

AODV路由协议是ad hoc网络中一种典型的按需路由协议,但是当网络节点具有高移动性,网络拓扑变化频繁使得路由链路断开频繁时,按需路由协议包括AODV算法都缺乏鲁棒性,各个移动节点在发送数据包时需要不断发起路由请求.文章对AODV算法进行了详细分析,并利用路由缓存技术对AODV算法进行了改进.在缓存中建立了两条备用路由,当活动路由链路断开时,选取一条较好的备用路由作为活动路由.NS2仿真结果表明,这种带缓存功能的AODV算法能降低丢包率、时延,提高路由的稳健性,从而适应网络拓扑结构的频繁变化.     

基于ZigBee的无线传感器网络路由分析

为了研究基于ZigBee的无线传感器网络路由协议的性能优劣,在路由设计中有选择地改进。介绍了ZigBee无线传感器网络结构,分析了AODV、LEACH和ZigBee路由三种路由协议的基本原理,并使用NS2模拟仿真软件,在其他外部条件相同的情况下,分别对ZigBee路由和AODV进行模拟仿真,以能量消耗和网络生命周期为衡量网络性能的指标,仿真结果表明ZigBee路由在能耗上高于AODV,算法在节能上有待改进。指出了ZigBee路由算法在节能上的改进方法。     

多跳蜂窝网互连性研究

将Ad Hoc网络与蜂窝网融合首要解决的问题是Ad Hoc如何接入蜂窝网,多数方案使用的是移动IP。提出了一种基于扩展Ad Hoc路由协议的多跳转发网络方案。Ad Hoc多种路由协议中可以实现Ad Hoc网络与蜂窝网互连的只有DSDV,但在移动场景中的低性能限制了它的发展。AODV是Ad Hoc路由协议中最有前途的协议,但它并不支持Ad Hoc节点接入基站的路由搜索。研究对AODV协议进行改进,以使它能支持移动节点到固定基站以及有线网络的寻路。     

移动Ad hoc网络中AODV路由协议的研究与改进

针对移动Ad hoc网络AODV路由协议存在的一些缺点,提出了一个改进的路由协议。在改进方案中增加了备份路由和电池电量门阀值,可以有效避免路由的重新发现。性能分析与仿真结果表明,改进后的AODV路由协议更能适应网络拓扑结构的变化,并能在链路中断后迅速找到可用的路由。     

一种基于带宽接入控制的AODV改进路由协议

无线自组网中的路由协议AODV没有提供流控和拥塞避免机制,当网络负载较重时,多媒体业务或产生较大的延时,或分组被大量丢弃,使网络性能下降.在AODV协议的基础上,提出一种基于带宽接入控制的改进协议BAC-AODV,对节点和路径的可用带宽进行估算,修改路由建立机制,使路径满足业务流对带宽的需求,保证网络的QoS质量.分析和仿真结果表明,改进后的协议相比原有AODV,能更有效地控制业务流量,提高吞吐量,降低延时.     

A highly topology adaptable ad hoc routing protocol with complementary preemptive link breaking avoidance and path shortening mechanisms

Ad-hoc on-demand distance vector routing (AODV) is a well-known routing protocol for mobile ad hoc networks. The original AODV protocol works in a semi-dynamic fashion, by establishing a route on demand and using that route until it breaks. However, to suit the changing network topology of ad hoc networks, more aggressive and adaptable routing strategies are required. A number of researches have proposed improving AODV performance by locally repairing broken links, predicting and replacing potentially vulnerable links, or shortening a link through removing redundant nodes from the transmission path. Although local repair may relieve some problems, it usually results in longer paths and thus a considerable performance drop in heavy traffic conditions. There are also issues regarding packet loss and communication delay due to route rebuilding once the link is broken. Predicting and replacing potentially vulnerable links may require special hardware, additional tables to maintain, or other extra overhead. Finally, path shortening may result in shorter and more efficient routes, but there is no guarantee that the new paths will be robust. This paper proposes integrating preemptive link breaking avoidance and path shortening mechanisms into a modified AODV protocol. However, the difficult issue lies in determining the right timing to initiate the two independent mechanisms so that the two dynamically and complementarily operating mechanisms can work together to improve the routing performance. Through numerical analysis and simulation, we have arranged a simple parameter setting for controlling the activation of each mechanism at the appropriate time. The proposed combination is a highly dynamic ad hoc routing protocol that is capable of adapting itself to the changing network topology and achieving extremely good performance in various routing performance metrics. Extensive simulations show that each of the two schemes alone improves AODV performance. More importantly, the integrated protocol performs even better in terms of data delivery rate, average delay time, and network overhead. To be more specific, in the best cases our protocol can reduce up to 82% in control overhead and 66% in delay time, while achieving 12% more in data delivery rate comparing to AODV.     

移动Ad Hoc网络中AODV路由协议的改进

移动Ad Hoc网络研究中,路由协议是一个关键问题。鉴于Ad Hoc网络的高移动性,通信路径的稳定性显得尤为重要。本文在基于AODV（Ad Hoc On-Demand Distance Vector）按需距离矢量路由的思想上,提出一种新的双径路由改进方案。旨在提高协议的健壮性,增强网络对拓扑变化的适应能力。性能分析和仿真结果表明,改进后的AODV路由协议,降低了端到端时延,减少了数据包的丢失,提高了网络的吞吐量,使得网络的性能得到了提升。     

基于AODV的多度量无线路由算法研究

随着移动自组网络的快速发展,对距离矢量按需路由协议(AODV)的服务质量提出了越来越高的要求.为了提升AODV在无线传感器网络通信中的表现,文章提出了一种新型的基于AODV的多度量无线路由协议(MWR-AODV).MWR-AODV综合考虑了对路由协议性能影响重大的最小跳数、剩余能量、能量流失率和网络节点密度这四个因素,并且引入了一种低成本且高效的本地修复策略.通过Network Simulator-2仿真平台对MWR-AODV与标准AODV、DSDV协议的表现进行了仿真分析.结果表明,所提出的MWR-AODV能为无线传感器网络提供更好的通信服务,并且在均衡能量消耗延长网络寿命和平衡网络通信负载方面也有上佳表现.     

路由信息的攻击对AODV协议性能的影响分析

AODV协议是移动自组网络中一种按需反应的表驱动路由协议。在移动自组网中，每个节点既是计算机又是路由器，容易遭受基于路由信息的网络攻击，而现今的路由协议基本没有考虑到该问题。本文在分析移动自组网中针对路由信息主要攻击方法的基础上，建立了主动性和自私性两个攻击模型，并且在AODV协议中扩充实现了这两类攻击行为。通过对模拟结果的分析和比较，讨论了路由信息的攻击对AODV协议性能的影响，并进一步探讨了针对基于路由信息攻击的防御措施。     

Scalability enhancement of AODV using local link repairing

Dynamic change in the topology of an ad hoc network makes it difficult to design an efficient routing protocol. Scalability of an ad hoc network is also one of the important criteria of research in this field. Most of the research works in ad hoc network focus on routing and medium access protocols and produce simulation results for limited-size networks. Ad hoc on-demand distance vector (AODV) is one of the best reactive routing protocols. In this article, modified routing protocols based on local link repairing of AODV are proposed. Method of finding alternate routes for next-to-next node is proposed in case of link failure. These protocols are beacon-less, means periodic hello message is removed from the basic AODV to improve scalability. Few control packet formats have been changed to accommodate suggested modification. Proposed protocols are simulated to investigate scalability performance and compared with basic AODV protocol. This also proves that local link repairing of proposed protocol improves scalability of the network. From simulation results, it is clear that scalability performance of routing protocol is improved because of link repairing method. We have tested protocols for different terrain area with approximate constant node densities and different traffic load.