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研究生： 蔡明辰
Ming-Chen Tsai
論文名稱： 在Wi-Fi & WiMAX環境下使用MIH服務之多屬性決策換手機制
Multi-Attributes Handover Decision Mechanism across Wi-Fi & WiMAX Using MIH Services
指導教授： 吳中實
Jung-Shyr Wu
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
畢業學年度： 95
語文別： 中文
論文頁數： 76
中文關鍵詞： 多屬性決策 、換手 、MIH
外文關鍵詞： MIH, MADM, Handover
相關次數： 點閱：7  下載：0 
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    • 隨著無線網路的蓬勃發展，未來的無線網路會是將現有的數種不同技術的無線網路整合起來，讓使用者能享受到隨時隨地都能上網的好處。而現有的無線網路有很多種，本文將重點放在同是IEEE所提的Wi-Fi & WiMAX並存的網路架構下，探討使用者在其間的換手問題，並提出了一種能考量到維持使用者原先的訊務品質的前提下之一種換手機制，其主要是當使用者要換手時，可能的目標網路不只一種時，不僅以傳統的訊號強度做為考量，還考量到是否換手過去的網路能否盡量維持使用者原先的服務品質甚至更好；考量的這部分則用了MIH的service加上多屬性決策的方式來選出一個較佳的網路；透過模擬的數據顯示出來，本文所提出來的方法較傳統的以訊號強度為考量的換手方式，不管是在換手次數、call被drop 的機率，或是基地台使用率的變化，都有較佳的結果。

    With the rapid growth of wireless networks, the next generation wireless networks tend to be the integration of the existing wireless networks, which allow users to enjoy the benefits of the Internet anywhere and anytime.
    There are many kinds of wireless networks. This thesis will focus on the Wi-Fi & WiMAX co-existing environment and discuss the handover problem. We propose a handover mechanism to maintain the user’s quality of service(QoS) after handover. The main idea is to consider not only the received strength of the signal but also the user’s QoS when a user has to handover. We use the MIH services and the MADM method to choose a best network if there is more than one network nearby.
    The results of our simulation show that the proposed mechanism is better both in handover times and dropping rate.

    摘要 i Abstract ii 致謝 iii 目錄 iv 圖目錄 v 表目錄 vi 第一章 序論 1 1.1 前言 1 1.2 現階段熱門無線網路技術 1 1.3 研究動機 2 1.4 論文架構 4 第二章 相關背景及研究 5 2.1 背景介紹 5 2.2 IEEE 802.11相關介紹 5 2.2.1 實體層 (Physical Layer)概述 6 2.2.2 媒體存取控制層(MAC Layer)概述 9 2.2.3 IEEE 802.11e 11 2.3 IEEE 802.16相關介紹 14 2.3.1 實體層 (Physical Layer)概述 15 2.3.2 媒體存取控制層(MAC Layer)概述 16 2.3.3 IEEE 802.16e 16 2.3.4 關於QoS 21 2.3.5 Wi-Fi & WiMAX比較 21 2.4 MIH (Media Independent Handover) 22 2.4.1 Media Independent Event Service (MIES) 24 2.4.2 Media Independent Command Service (MICS 26 2.4.3 Media Independent Information Service (MIIS) 27 2.5 相關研究 29 第三章 系統架構 31 3.1 前言 31 3.2 Information Server 31 3.3 Fuzzy MADM (Multiple Attributes Decision Making) 33 3.3.1 Analytic Hierarchy Process 層級分析法 34 3.3.2 MADM方法概述 40 3.4 系統架構環境介紹 44 3.5 機制與流程 45 3.5.1 [機制一] 46 3.5.2 [機制二] 48 第四章 模擬結果與數據分析 51 4.1 前言 51 4.1.1 系統模擬參數 52 4.2 數據分析及討論 52 4.2.1 Part1：mobile node所遭遇總換手次數的比較 52 4.2.2 Part2：不同traffic type所遭遇的換手次數 54 4.2.3 Part3：不同MADM決策方式的差異 60 4.2.4 Part4：Dropping Rate之比較 63 4.2.5 Part5：不同loading下dropping rate之比較 68 第五章 結論 73 5.1 結論 73 5.2 未來工作 74 參考文獻 76

    [1]IEEE 802.11, http://en.wikipedia.org/wiki/802.11
    [2]WMAX forum, http://www.wimaxforum.org
    [3]IEEE 802.21 D01.00, http:// www.ieee802.org/21/
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    Computing and Applications, NCA ‘06
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    [10] Qingyang Song and Abbas Jamalipour, " A Network Selection Mechanism for Next Generation Networks , " ICC, Vol2, pp.1418-1422,May 2005
    [11] Ming-Hong Wu, Yun-Mun Chen, Tein-Yaw Chung and Chih-Hung Hsu, "A profile-based Network Selection with MIH Information Service," ICS ,Dec 2006
    [12] Fang Zhu and Janise McNair, "Multiservice Vertical Handoff Decision Algorithms," EURASIP Journal on Wireless Comminucation and Networking, Article ID 25861, pp.1-13, 2006
    [13] K.Paul Yoon and Ching-Lai Hwang, "MULTIPLE ATTRIBUTE DECISION MAKING-An Introduction," SAGE PUBLICATIONS, 1995
    [14]Shu-Jen Chen, Chin-Lai Hwang, "Fuzzy Multiple Attribute Decision Making,"Spring-Verlag, 1992
    [15] WiMAX QoS Whitepaper Draft – Sep 2006, WiMAX Forum
    [16] Shantidev Mohanty and Ian F. Akyildiz, "A Cross-Layer
    (Layer2+3) Handoff Management Protocol for Next-Generation Wireless Systems," Mobile Computing, IEEE Transactions on Publication, 2006

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