一种改进AODV重路由算法在无线Mesh网络中的应用

本文在AODV路由协议的基础上提出了一种基于无环替代(LFA)的前摄性重路由机制,旨在提高无线Mesh网络的快速自愈的能力.文中首先介绍了AODV的改进AODV备份路由协议,并指出AODV备份路由协议的不足,然后提出了基于无环替代的AODV路由算法AODV-LFA,最后通过NS仿真实验,比较了AODV、AODV备份路由和AODV-LFA的丢包率、端到端时延等,表明AODV-LFA具有更强的自愈能力.     

网络编码在无线Mesh网络中的研究与实现

Mesh网络沿用了Ad Hoc网络中的路由协议,但Mesh网络节点移动性高,路径的生存周期短,根据无线Mesh网络自身的动态特点进行路由协议的优化成为了研究的热点。COPE编码方案是针对Mesh网络中的单播特性提出的一种新的机会网络编码机制,能够提高网络的吞吐量。通过NS2仿真平台对AODV路由协议添加COPE网络编码方案,仿真结果表明在不同网络条件下,AODV和COPE的结合增加了无线节点的编码机会,使网络的吞吐量得到了有效的提高。     

一种改进无线Mesh网络孤岛效应的路由算法研究

针对无线Mesh网络路由协议自身的缺陷而导致的孤岛效应,分析了其形成原因以及对网络的危害,通过对AODV、DSDV、DSR和TORA等典型路由协议的具体分析,提出动态传输距离算法,整理形成了改进的AODV路由协议,仿真结果表明,改进后的协议能够很好地解决Mesh孤岛效应。     

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）。     

无线Mesh网路由协议仿真及性能分析

当前对无线网格网络（Mesh网络）主要研究之一是无线路由技术,即针对无线Mesh网络自身的特点进行路由设计。在熟悉基于Linux平台的网络仿真器（NS2）针对Mesh网络路由协议的仿真过程的基础上,利用NS2网络仿真软件分别从端到端平均时延、分组递交率、归一化路由开销三个方面比较了目前三种典型的路由协议——按需平面距离矢量路由（AODV）、动态源路由（DSR）和目的序列距离矢量路由（DSDV）的性能,并详细介绍了整个仿真过程的步骤。最后,通过分析AODV协议的吞吐量,得出网络最佳容纳的节点数,研究成果对协议的实现具有重要的应用价值。     

基于无线Mesh网络的视频传感器节点研究与设计

视频信息传输对救灾、应急通信和特殊区域监控有着重要意义,网络的适应性和带宽问题是限制视频监控系统发展的重要因素.无线Mesh网络具有带宽高、易组网等优点,能够提供实时的视频传输服务.首先完成对基于Mesh网络的视频监控系统整体架构设计,通过实验仿真的方法对比几种常用的Mesh网络路由协议性能,根据仿真结果和应用需求,选择AODV作为路由协议方案.然后在DM365硬件平台和嵌入式Linux操作系统平台之上完成视频传感器节点设计.最后对无线Mesh网络多跳带宽性能进行测试,测试结果表明系统可以满足应用需求.     

Mesh网下AODV、DSR和ZigBee路由的比较分析

为了研究在Mesh拓扑网络下不同无线自组网络路由协议的性能优劣,在网络设计中有选择地使用,分析和研究了ZigBee路由、动态源路由协议（DSR）和平面距离矢量路由协议（AODV）三种无线自组网络路由协议的思想和原理。通过网络模拟软件NS-2,在其他外部条件相同的条件下对三者在Mesh拓扑结构组网进行模拟,得到端到端平均延迟、包传输率和路由开销率三种性能指标的折线图。从仿真结果图上看,ZigBee路由在其应用范围内具有独特优势,适合在Mesh拓扑网络中应用。     

WMN中基于免疫算法的QoS路由研究

无线Mesh网络的路由技术是影响网络性能的一个关键问题。针对无线Mesh网络的QoS多约束路由算法难于找到最优路径的问题,提出了一种基于免疫算法的路由算法,利用免疫算法的寻优能力,实现了无线Mesh网络QoS多约束条件下的最优路径选择,并与基于遗传算法的路由算法进行了比较。实验结果表明,利用免疫算法获得满足QoS要求的最佳路径时,不容易陷入局部最优,且收敛速度快,性能优越,更符合无线通信实时性的要求。     

基于无线Mesh网络的干扰感知型路由判据

在无线Mesh网络路由判据的研究中,最小跳数、ETX、ETT等路由判据没有考虑到无线网络中的干扰问题,据此选出的一般不是最佳路由。因此,基于它们的路由协议会对整个无线Mesh网络的延时、丢包率、吞吐量等性能产生较大影响。干扰感知型路由判据的提出对无线Mesh网络性能的提升起到了一定的作用。     

无线MESH网络路由协议研究

无线Mesh网络WMN (wireless mesh networks)是近年来的研究热点之一,它融合了无线局域网(WLAN)和Ad Hoc网络的优势,为解决"最后一公里"问题提供了一种很有效的宽带接入手段.而无线Mesh网络的路由算法则是这个领域中的研究难点.本文首先介绍了无线Mesht网络的一些背景及其特点.然后对可以应用于无线Mesh网络的几种传统的路由协议进行了分析比较.最后简单介绍了当前这个领域的几种最新的无线Mesh网络路由算法.并展望了今后无线Mesh网络路由算法的研究前景.     

Routing in Large-Scale Wireless Mesh Networks Using Temperature Fields

Many wireless mesh networks are based on unicast routing protocols even though those protocols do not provide a particularly good fit for such scenarios. In this article, we report about an alternative routing paradigm, tailor-made for large multihop wireless mesh networks: field-based anycast routing. In particular, we present HEAT, a routing protocol based on this paradigm. In contrast to previous protocols, HEAT requires communication only between neighboring nodes. The underlying routing concept is a field similar to a temperature field in thermal physics. In extensive simulation experiments, we found that HEAT has excellent scalability properties due to a fully distributed implementation, and it provides much more robust routes than the unicast protocols, AODV and OLSR. As a consequence, in large-scale mobile scenarios, the packet delivery ratio with HEAT is more than two times higher, compared to AODV or OLSR. These promising results indicate that HEAT is suitable for large-scale wireless mesh networks that cover entire cities.     

无线Mesh网中实时数据业务仿真与分析

无线Mesh网络是一种架构式多跳无线网络,具有结构灵活、快速部署、自组织和自愈合等优点,具有广泛的应用前景。通过采用ns-2仿真软件对基于IEEE 802.11 MAC协议和AODV路由协议的无线Mesh网中实时数据业务的数据传输进行建模与仿真,分析了Mesh网络中数据流经过的传输跳数与吞吐率的关系,以及MAC层RTS/CTS、重传次数以及MAC层和路由层相互作用对无线Mesh网中实时数据业务性能的影响,指出了提高无线Mesh网中实时数据业务性能的所需要的改进方向。     

High throughput route selection in multi-rate wireless mesh networks

Most existing Ad-hoc routing protocols use the shortest path algorithm with a hop count metric to select paths. It is appropriate in single-rate wireless networks, but has a tendency to select paths containing long-distance links that have low data rates and reduced reliability in multi-rate networks. This article introduces a high throughput routing algorithm utilizing the multi-rate capability and some mesh characteristics in wireless fidelity （WiFi） mesh networks. It uses the medium access control （MAC） transmission time as the routing metric, which is estimated by the information passed up from the physical layer. When the proposed algorithm is adopted, the Ad-hoc on-demand distance vector （AODV） routing can be improved as high throughput AODV （HT-AODV）. Simulation results show that HT-AODV is capable of establishing a route that has high data-rate, short end-to-end delay and great network throughput.     

Mesh IP Video Surveillance Systems Model Design and Performance Evaluation

This paper proposes a model for Internet Protocol (IP) mesh video surveillance systems and presents the performance evaluation of Ah-hoc On-demand Distance Vector (AODV) and Open Shortest Path First (OSPF) routing protocols in wireless mesh video surveillance system. A wireless mesh video surveillance network consists of IP cameras linked to mesh routers which are then linked to the mesh gateways. Local monitoring can be done by inserting a switch or router between the gateways and the Internet while remote monitoring can be done through the Internet. Routing provides selection, constructing and management of routes in order to maximize throughput and minimize video packet losses, end-to-end delays and Jitter. Results show that the OSPF routing protocol outperformed the AODV in throughput, packet loss, end-to- end delay and Jitter terms with a throughput advantage of 35%.     

基于ZigBee的自愈组网与协议实现

ZigBee技术是一种低功耗、网络容量大、时延小且具有自组织自愈功能的无线通讯技术。利用ZigBee技术组建的网络是一种低数据传输速率的无线个域网。在简要阐述传感器网络节点的基本体系结构的基础上,介绍了基于CC2530的ZigBee传感器节点的硬件组成。主要是对多跳自组路由协议和网状网的自愈的研究,并在此硬件平台上进行组网,通过对生理信息数据的传递来进行检验。     

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。     

Predictability of Aggregated Traffic of Gateways in Wireless Mesh Network with AODV and DSDV Routing Protocols and RWP Mobility Model

When evaluating the performance of routing protocols in wireless mesh network (WMN), we need deeper analysis from the aspect of network traffic complexity to show how traffic characteristics are influenced by routing protocols and node mobility. The predictability of network traffic can be used as one metric of complexity and can be analyzed by multi-scale entropy (MSE) method. With 20 different random waypoint (RWP) mobility scenarios and with destination sequenced distance vector (DSDV), a typical proactive protocol, and Ad hoc on-demand distance vector (AODV), a typical reactive protocol, the predictabilities of aggregated traffic of gateway in WMN are analyzed using MSE method to show how different routing protocols bear different mobility scenarios. The MSE results show that the aggregated traffic of gateway with DSDV is more difficult to be predicted than that with AODV for different mobility scenarios. The maxspeed parameter of RWP dominates the traffic predictability for AODV. Both of the pause time and the maxspeed parameters, have great influence on the traffic predictability for DSDV. The reasons lie in the behaviors of routing protocols, i.e., AODV has up-to-date paths while DSDV does not.     

无线mesh网中一种基于博弈论的公平性路由协议

提出一种基于博弈论的以树为拓扑结构的公平性路由协议.新的协议综合了先验式路由和按需路由,并且将路由计算和信道资源分配控制分布到树中的每个枝节点上,降低了根节点的负担,使其更适合于无线 mesh网的通信需求.仿真结果表明,新的路由协议改进了AODV、HWMP路由协议的端到端平均延迟和网络吞吐量,并且网络中各个无线节点占有的信道资源基本相近,满足公平性原则.