臺灣博碩士論文加值系統

無線通訊改變了人們通訊的方式。而如何在有限的頻譜中提供無線寬頻上網就成了很大的挑戰。WiMAX和LTE可能是未來十年的解決方案。根據WiMAX Forum的資料顯示，在2009年五月就有475個WiMAX網路在140個國家佈建完成。但卻只有非常少的可攜式裝置和筆電有WiMAX上網的能力。所以對WiMAX營運商而言，如何使現在的使用者能輕易的連上WiMAX網路而不需要他們更換現在的裝置是很大的挑戰。一個透過WiMAX上網的Wi-Fi熱點也許是一個又簡單又吸引人的解決方法。在這篇論文中我們實作了一個低耗電的WiMAX可攜式路由器。這個裝置不但提供其他行動裝置透過Wi-Fi經由WiMAX上網也包含了電池，所以說是一個可攜式路由器。

Wireless communication has changed the way people communicate. How to provide broadband wireless is always a great challenge in limited frequency resources.WiMax and LTE seems to be the solution in the next decade. According to WiMAX Forum, as of May 2009, 475 networks are deployed in 140 countries. However, very few of the mobile devices and laptops have integrated with WiMAX access capability. It is a very big challenge for operators to have current users easily accessing the internet through WiMAX without selling new devices which have WiMAX capability to them. The idea of portable hotspot using WiMAX might be the easiest and most attractive way for most of users. In this thesis we have implemented a portable internet access device with low power consumption. This device has routing capability to access WiMAX and can be connected by all mobile devices with Wi-Fi or internet capability. This device is driven by battery such that it is portable.

Abstract i
Acknowledgements ii
Contents iii
Introduction vi
1 Introduction 1
1.1 Motivation 2
1.2 Goals 2
2 Background 3
2.1 Hardware 3
2.1.1 WiMAX chip 4
2.1.2 Wi-Fi chip 5
2.1.3 Processor 5
2.1.4 Battery 6
2.1.5 USB Connector 6
2.2 Software Tools 7
2.2.1 Linux4SAM 7
2.2.2 Virtual Machine 7
2.2.3 Linux OS 8
3 Proposed architecture 9
3.1 The Linux 9
3.1.1 Linux Kernel 10
3.1.2 File System ( Buildroot ) 10
3.1.3 Boot Sequence 10
3.2 The Data Flow 11
3.3 Packet Traversal 11
3.4 Drivers and Modules 13
3.4.1 WiMAX Driver 13
3.4.2 Wi-Fi Driver 15
3.4.3 Battery Driver 15
3.4.4 USB Gadget driver 15
3.4.5 Bridge 15
3.4.6 Netfilter 16
3.4.7 UDHCPD 16
3.4.8 Dnsmasq 16
3.4.9 Mongoose 16
4 System Evaluation 17
4.1 Throughput Performance 17
4.1.1 Comparison 17
4.2 Battery Performance 18
5 Conclusion 19

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