基于完善WiMax技术的无线Mesh网络负载均衡策略研究

摘要

WiMAX是新一代城域网宽带无线接入技术，能够提供广阔的高速传输范围以支持固定和移动宽带接入，从而获得灵活、高效的网络经济。第四代(4G)移动无线网络是一个具有广泛应用前景的移动技术，是移动产业领域的研究热点，且已经有效地应用到世界大多数地方。而WiMAX是4G无线系统中的关键技术，也是无线通信技术中的前沿技术。
　　作为未来通信技术中不断发展的关键技术，无线网状网(WMNs)的主要目的是为更广阔的地域提供无线宽带网络服务，在多个接入点间使用多跳无线通信替代有线通信。为了在不可靠的无线媒介中提高通信服务的性能和质量，提出了自适应流量均衡策略的流量分配算法。本论文提出一种显式自适应流量均衡(EATB)策略，结合最短路径协议和APTLB（无线网状网络中流量负载均衡方法）的优势，同时很好地克服了两种算法的不足，例如拥塞、丢包和路径延迟。通过仿真评估本论文提出的算法，仿真结果显示，使用本论文提出的新自适应流量均衡策略后，网络性能较早期的算法得到明显改善，使系统资源得到更好地管理。

目录

声明

Abstract

摘要

Acknowledgments

TABLE OF CONTENTS

List of Figures

List of Tables

Chapter 1 Introduction

1．1 Introduction

1．2 Wireless Mesh Networks

1．3 Advantages of WMNs

1．4 Architeeture and Characteristics of WMN

1．4．1 Architecture of WMN

1．4．2 WMN Components

1．5 Applications of WMNs

1．6 Routing Protocols in Wireless Mesh Networks

1．6．1 CLASSIFICATION of routing

1．7 Open research issues

1．7．1 Physical layer

1．7．2 MAC layer

1．7．3 Network layer

1．7．4 Transport layer

1．7．5 Application layer

1．8 Related Works

1．9 Organization of Thesis

Chapter 2 WiMAX Technology

2．1 Overview

2．2 WiMAX Technology

2．3 Mechanism Of Wimax Technology

2．3．1 Line of Sight

2．3．2 None Line of Sight

2．4 TYPES OF WIMAX

2．4．1 Fixed WiMax

2．4．2 Portable WiMax

2．4．3 Mobile WiMax

2．5 WIMIAX STANDARDSAND ITS ARCHITECTURE

2．6 WiMax MAC layer

2．7 WiMax Physical layer

2．7．1 Wireless MAN-Single carrier

2．7．2 Wireless MAN-OFDM

2．7．3 Wireless MAN-OFDMA

2．8 WiMAX，Wi-Fi and 3G

2．8．1 Introduction of Wi-Fi Technology

2．8．2 Introduction of 3G Technology

2．9 Implementation WIMAX

2．9．1 Metropolitan Area Network

2．9．2 Networks for Educational Purposes

2．9．3 Campus Based Connectivity

2．9．4 Backhaul of Wireless Service Providers

2．9．5 Connectivity for Rural Areas

2．9．6 Residential and SOHO

2．9．7 Cellular backhaul

Chapter 3 WIMAX Protocols

3．1 Routing protocols

3．2 Routing Types in WiMAX Networks

3．2．1 Destination-Sequenced Distance-Vector Routing(DSDV)

3．2．2 Ad-hoe On-demand distance vector Routing(AODV)

3．2．3 Dynamic Source Routing(DSR)

3．3 RISSUES RELATED TO ROUTING IN WMN

Chapter 4 Traffic Balancing in Wireless Mesh Networks

4．1．Problem Description

4．2 Traffic Balancing Mechanism

4．3 An Explicit Adaptive Traffic Balancing Algorithm in Wimax(EATB)

4．4 Wireless Mesh Network Model Structure for the Three Algorithms

4．5 Experimentations and analysis of experimental results

4．6 Simulation Results

Chapter 5 Conclusions and Future Research

Publication from this thesis

References