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    题名: 異質性無線網路下垂直換手機制之研究
    A vertical handoff mechanism in heterogeneous wireless network
    作者: 莊森駒
    Chuang, Sen Chu
    贡献者: 張宏慶
    Jang, Hung Chin
    莊森駒
    Chuang, Sen Chu
    关键词: 遞換
    異質網路
    乒乓效應
    模糊理論
    Handover
    Heterogeneous Network
    Ping Pong effect
    Fuzzy Theory
    日期: 2009
    上传时间: 2016-05-09 16:46:42 (UTC+8)
    摘要: 隨著各種無線網路技術興起至今，各類無線網路技術及產品日益成熟與普及且無線網路的使用者也逐漸變多。而今在各種無線網路的廣泛使用下、時而可見的是當一個行動使用者手持行動裝置身處在一地理環境中，手持行動裝置一經掃描後，常會發現有許多無線網路其覆蓋範圍共同覆蓋在同一個地理區域中，此時多個無線存取點(Access Point)就會發生訊號覆蓋的重疊現象。行動使用者的行動裝置常需判斷是否應該切換到另一個無線網路，此種情形也就是所謂的遞換(Handoff)情形。遞換之產生，代表行動使用者從原本的無線網路區域範圍移動到另一個無線網路範圍，此時若因外界無線電訊號有所變化或是相關網路協定運作出現狀況時、就很容易產生通訊中斷的情形。

    在本論文中我們將探討在異質性網路的情況下，根據多種不同的參數、來
    設計一個垂直交握(Vertical handoff)的機制。以克服在異質性網路中，時常發生連線中斷之問題。本篇論文主要引使用模糊理論概念來推論其遞換(Handoff)執行的時間點，並且明確的告知終端設備要進入何種網路。
    In this paper, we propose a terminal –control scheme to avoid unnecessary vertical handovers between 3G cellular and WLAN hotspots.
    The proposed algorithm is a fuzzy logic based algorithm that can adapt itself
    to the dynamic conditions of the hybrid networks. The scheme can reduce the
    access delay, unnecessary handoff probability and aid the handoff decision for
    better connectivity. This handoff algorithm has much better performance than
    conventional algorithms and can be extended to other heterogeneous networks.
    CHAPTER 1 序論 1
    1.1 前言 1
    1.2 UMTS網路架構簡介 2
    1.3 IEEE 802.11及IEEE 802.11e QoS簡介 6
    1.3.1 IEEE 802.11簡介 6
    1.3.1.1 RTS/CTS 6
    1.3.1.2 分散式協調功能(DCF) 7
    1.3.1.3 集中式協調功能 (PCF) 8
    1.3.2 IEEE 802.11e QoS簡介 9
    1.4 IEEE 802.21 簡介 12
    1.4.1 媒體獨立事件服務 13
    1.4.2 媒體獨立命令服務 14
    1.4.3 媒體獨立資訊服務 16
    1.5 研究動機 16
    1.6 論文章節架構 17
    CHAPTER 2 背景及相關研究 18
    2.1 階層式異質性網路架構 18
    2.2 Handoff介紹 19
    2.3 Ping Pong Effect (乒乓效應)及遲滯現象 21
    2.4 相關研究 22
    CHAPTER 3 模糊理論及演算法 25
    3.1 真實世界的特性—模糊化的現象[15,50] 25
    3.2 Fuzzy理論概述 26
    3.3 模糊輸入歸屬函數 28
    3.4 模糊規則庫 28
    3.5 模糊輸出歸屬函數 29
    3.6 系統架構 30
    3.7 演算法 34
    CHAPTER 4 模擬結果與討論 39
    4.1 模擬網路環境與佈建方式之規劃 39
    4.2 模擬環境參數設定 40
    4.3 模擬實驗之結果分析 41
    CHAPTER 5 結論及未來研究方向 44
    5.1 結論 44
    5.2 未來研究方向 45
    REFERENCE 46
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    描述: 碩士
    國立政治大學
    資訊科學學系
    93971005
    資料來源: http://thesis.lib.nccu.edu.tw/record/#G0093971005
    数据类型: thesis
    显示于类别:[資訊科學系] 學位論文

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