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1、本科毕业论文本科毕业论文题题 目：目：一种无线网状网中的多接口一种无线网状网中的多接口 多路径路由协议多路径路由协议姓 名：学 院：软件学院系：软件工程专 业：软件工程年 级： 学 号：指导教师（校内）： 职称： 指导教师（校外）： 职称： 年 月I摘 要近几年来，无线网状网(无线 Mesh 网)逐渐成为一个研究热点。无线网状网是一种基于多跳路由、对等网络技术的新型网络。该类型无线网络的潜力使无线宽带数据连接成为一种可实施的技术。作为移动自组网的一个特例，组成无线网状网基础设施的路由结点通常是非移动性的，因此它们可以被认为是固定结点的。而作为无线网络，其特性与有线网存在很多方面的不同，这导致了
2、现有有线网的很多概念都无法直接移植到无线网状网中。这些特殊性质让无线网状网的研究领域十分宽广。在无线网状网的组网框架中，内部数据是通过一个或者多个网关与外部因特网相连通的，因此无线网状网路由协议的设计就尤其重要。目前已经涌现了不少针对提高网内数据传输能力的研究成果。本文正是在前人的基础上，通过比较四种无线网状网路由类型，试图通过提出一种新的基于多接口、多路径的类 AODV 式路由协议来提升网络内部数据传输能力。该协议称为 MMAODV。这个新提出的协议通过动态生成并维护两条或者两条以上的数据传输路径以增加单位时间内的数据传输量。而各个路径之间以及路径内部节点间通信的频道竞争、信号干扰问题则通过
3、动态分配频道、多接口同时工作的最优化选择来予以避免。本文的最后利用 NS2 平台对于新协议进行了仿真实验，并通过与 AODV 路由协议和其他类型的路由协议的对比验证了 MMAODV 在性能方面的提升。关键词：无线网状网； 动态路由协议； 多路径； 多接口； 多频道IIMulti-Interface and Multi-Path Ad hoc On-Demand Distance Vector Routing Protocol in WMNsAbstract In recent years, Wireless Mesh Network (WMN) becomes a popular topic.
4、 WMN is a novel network base on multi-hop routing and equivalent network technology. Its potential makes broadband wireless internet access possible and practical.As a special case of mobile ad hoc networks, nodes of WMNs have relative fixed position, thus they can be considered to be static. And as
5、 a case of wireless networks, it is quite different from wired networks, thus lots of existing network notions can not be used in WMNs any more. These special characters cause many research issues in this area.In the framework of WMN, inner nodes communicate with internet through one or more gateway
6、s. Consequently, routing protocol for WMN is very important. Nowadays, a large quantity of work on this area has established various routing protocols in WMNs to improve end-to-end throughput, and this thesis is one of them. We summarize the existing works, compare four types of WMN routing scenario
7、s, and set up a novel dynamic scheme called Multi-Interface and Multi-Path Ad hoc On-Demand Distance Vector (MMAODV) Routing Protocol based on the effort above. The proposed protocol dynamically establishes and maintains two or more paths for data transmission to increase the throughput of the flow
8、in a distributed manner. Dynamical channel assignment is incorporated to avoid channel competition and interference intra and/or inter paths. A simulation study on NS2（Network Simulator） was performed in our work to evaluate the system performance in terms of throughput in our proposed protocol comp
9、aring to AODV and other WMN routing protocols in different scenarios.Key Words: wireless mesh network; dynamic routing protocol; multi-path; multi-interface; multi-channelIII目 录第 1 章 绪论 .11.1 什么是无线网状网1 1.2 无线网状网研究方向2 1.3 路由协议设计要素2第 2 章 路由协议理论对比 .42.1 单接口与单路径4 2.2 多接口与单路径5 2.3 单接口与多路径6 2.4 多接口与多路径7 2
10、.5 小结8第 3 章 相关的研究 .93.1 AODV 路由协议 .9 3.2 多频道 MAC 层与 Link 层协议.9 3.3 多频道路由协议.10 3.4 多路径路由协议.11 3.5 JMM 路由协议 .11第 4 章 MMAODV 协议 124.1 概述.12 4.2 前提假设.12 4.3 算法.12 4.3.1 预定义 .12 4.3.2 路径搜索 .13 4.3.3 建立反向路径 .14 4.3.4 建立发送路径 .14 4.3.5 多路径维护 .14 4.3.6 数据传输 .15 4.4 算法实现.15 4.4.1 实现环境 .15 4.4.2 拓扑模型 .15 4.4.3
11、 解决方案讨论 .15 4.4.4 类 MeshRouter 的分析 17 4.4.5 路径生成实验 .20 4.4.6 算法小结 .21IV第 5 章 仿真 225.1 仿真环境.22 5.2 仿真结果与讨论.24 5.2.1 吞吐量的提高 .24 5.2.2 与跳数相关的性能表现 .25 5.2.3 在其他传输流干扰下的表现 .26 5.3 仿真小结.28第 6 章 总结与展望 29致谢 .31参考文献 .33VContentsChapter 1 Introduction 1 11.1 What is Wireless Mesh Network (WMN)1 1.2 WMN Issues
12、2 1.3 Key Elements of Routing Protocol Design.2Chapter 2 Comparison 4 42.1 Single-Interface and Single-Path Scenario4 2.2 Multi-Interface and Single-Path Scenario5 2.3 Single-Interface and Multi-Path Scenario6 2.4 Multi-Interface and Multi-Path Scenario.7 2.5 Summary .8Chapter 3 Related Work9 93.1 A
13、ODV Routing Protocol.9 3.2 Multi-Channel MAC and Link Protocols.9 3.3 Multi-Channel Routing Protocols.10 3.4 Multi-Path Routing Protocols.11 3.5 JMM Protocol.11Chapter 4 MMAODV Protocol12124.1 Survey12 4.2 Assumption12 4.3 Algorithm12 4.3.1 Predefinition.12 4.3.2 Path Discovery 13 4.3.3 Reverse Path
14、 Setup 14 4.3.4 Forward Path Setup.14 4.3.5 Multi-Path Maintenance.14 4.3.6 Data Transmission.15 4.4 Implementation15 4.4.1 Environment 15 4.4.2 Topology Model.15 4.4.3 Issues 15 4.4.4 Class MeshRouter in the Demo.17 4.4.5 Path Discovery Experiments .20 4.4.6 Summary .21VIChapter 5 Simulation 22225.
15、1 Environment.22 5.2 Result and Discuss24 5.2.1 The Enhancement of Throughput24 5.2.2 Performance related to Hops.25 5.2.3 Performance against Interference from other Flow .26 5.3 Summary .28Chapter 6 Conclusion2929Acknowledgement3131References33331Chapter 1 Introduction1.1 What is Wireless Mesh Net
16、work (WMN)?Wireless Mesh Networks (WMNs) are believed to be a promising technology to offer broadband wireless access to the Internet and to build self-organized networks in places where wired infrastructure is not available or not worthy to deploy1. WMNs are dynamically self-organized and self-configured, with the mesh nodes in the network automatically establishing an ad hoc network and maintaining the mesh connectivity2. Mesh routers
