改善無線網路換手延遲的主從式合作機制｜國立臺灣科技大學博碩士論文系統

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研究生：	邱裕文 Yu-Wen Chiu
論文名稱：	改善無線網路換手延遲的主從式合作機制 A Client-Server Cooperative Mechanism to Improve Handoff Latency in Wireless Network
指導教授：	陳漢宗 Hann-Tzong Chern
口試委員:	黃進芳 Jhin-Fang Huang 黎碧煌 Bih-Hwang Lee 蕭振木 none
學位類別：	碩士 Master
系所名稱：	電資學院 - 電子工程系 Department of Electronic and Computer Engineering
論文出版年：	2006
畢業學年度：	94
語文別：	中文
論文頁數：	90
中文關鍵詞：	IEEE 802.11 、換手、行動式IP 、微觀移動、無線區域網路
外文關鍵詞：	IEEE 802.11, Handoff, Mobile IP, Micro-Mobility, WLAN
相關次數：	點閱：207 下載：2
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在本論文中，為了改善在IEEE 802.11網路中因換手(handoff)所產生的問題，例如：過長的換手延遲(handoff latency)與網路訊息的壅塞(message congestion)等等，都會影響整個網路的運作效率及安全性；所以我們提出了主從式合作機制(client-server cooperative mechanism)以達到改善的目的和解決相關的問題。

在主從式合作機制中，我們會先利用存在於網路端的行動中心(mobility center，簡稱MC)對網域內所有行動節點(mobile node，簡稱MN)過去經過的無線存取點(access point，簡稱AP)所獲得的相關資訊進行紀錄，使得未來MN可以針對能提供較高服務品質(quality of service，簡稱QoS)的AP來進行handoff；另一方面在用戶端的MN中也會將局部的資訊保存於快取暫存區(cache)中，加快往後執行handoff的速度以便改善換手延遲的情形。

In this paper, we propose a new mechanism to obviate handoff delay and message congestion for fast handoff process in 802.11 networks. Since the utilization of wireless local area networks (WLAN) and security may degrade due to those problems, we take advantage of client-server cooperative mechanism to improve related issues.

We use mobility center (MC), to record related information about access point (AP) which mobile node (MN) had handoff before. So, MN can quickly select AP which has better quality of service (QoS) to execute handoff in the future. Besides these, MN also keeps local information about AP in cache to speed up the coming handoff. In this way, the above-mentioned problem can be improved well.

論文摘要 ............................................... IV
Abstract .................................................. V
誌謝 ................................................... VI
目錄 .................................................. VII
圖目錄 .................................................. X
表目錄 ................................................ XII

第一章  導論                                              1
1.1  研究背景 ........................................ 1
1.2  研究動機與目的 .................................. 2
1.3  各章摘要 ........................................ 3
第二章  IEEE 802.11系統及相關換手程序                     5
2.1  IEEE 802.11系統概述 .............................. 5
2.1.1  IEEE 802.11系統下的三項標準 ............... 5
2.1.2  IEEE 802.11系統下的媒介存取控制層 ......... 8
2.2  IEEE 802.11換手程序 ............................. 11
2.2.1  IEEE 802.11系統下的無線區域網路架構 ...... 11
2.2.2  IEEE 802.11系統下的管理訊框 .............. 13
2.2.3  IEEE 802.11系統下的換手流程 .............. 15
第三章  相關研究之探討                                   24
3.1  改善第二層換手延遲的方法 ....................... 24
3.1.1  實際量測後對於換手延遲的分析 ............ 24
3.1.2  選擇性掃描演算法 ........................ 30
3.2  第三層的行動管理策略 ........................... 34
3.2.1  巨觀移動下的管理方式 .................... 35
3.2.2  微觀移動下的管理方式 .................... 40
3.2.3  比較與分析 .............................. 47
第四章  主從式合作機制                                   50
4.1  相關系統架構及運作方式 ......................... 50
4.2  特性分析........................................ 59
第五章  模擬結果與效能分析                               62
5.1  模擬環境介紹 ................................... 62
5.2  結果與分析 ..................................... 64
第六章  結論與未來展望                                   70

參考文獻 ............................................... 72
作者簡介 ............................................... 77

                                

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