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研究生: 林詩凱
論文名稱: 以折衷式路徑選擇演算法改善AODV路由協定效能之研究
Improving AODV Route Protocol Efficiency with Compromised Route Selection Algorithm
指導教授: 莊謙本
Chuang, Chien-Pen
王宏鈴
Wang, Hong-Ling
學位類別: 碩士
Master
系所名稱: 機電工程學系
Department of Mechatronic Engineering
論文出版年: 2007
畢業學年度: 96
語文別: 中文
論文頁數: 52
中文關鍵詞: 無線隨意行動網路AODV折衷式路徑選擇演算法
英文關鍵詞: MANET, AODV, compromised route selection algorithm
論文種類: 學術論文
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  • 無線隨意行動網路(Mobile Ad hoc Networks:MANETs)是由一群可以隨意移動的無線行動設備所構成的網路,行動主機(mobile host)之間的通訊是藉由網路間鄰近的行動節點相互傳遞資料、交換訊息而完成。在此種網路中無線行動設備以其有限的無線電波頻寬、高速的移動性和有限的電量傳送訊號。它不含有任何有線或無線的網路基礎建設,也不需要集中式的管理;如基地台等。因此,在某些小區域或是無基地台支援的地區如戰地、災區等,ad-hoc無線網路就顯得更重要。
    在無線隨意行動網路中,由於大部份的節點是處於移動的狀態,所以傳輸路徑的改變或中斷是相當頻繁的事件。因此尋找穩定之傳輸路徑是一項重要的議題。本論文以AODV路由協定為基礎,利用訊號強度係數、節點的電量係數、忙碌程度係數三個係數加以計算出路徑選擇值。將此值填入路由請求封包內傳送,作為建立路徑時目的地端判斷路徑選擇的因素,以選擇出穩定的主要路徑與備用路徑用。其效能在減少路由斷裂次數與延遲時間及增加封包的到達率。本論文特色在無外加傳送其他的控制封包,而選擇出穩定度高的路徑,減少整體網路控制封包的傳送負荷,而提高整體網路的效能。

    Mobile ad hoc Networks (MANETs) is formed by a group of wireless equipment (node) that can move fast and no centralized management mechanism can be used. The communication between mobile nodes can be accomplished via the nearby mobile hosts interchanging messages. In case of the limited resources such as network bandwidth, memory capacity, and battery power, the efficiency of routing scheme in ad hoc networks becomes more important and challenging.
    In Mobile ad hoc Networks, most nodes are mobile and the routing path may be changed or disrupted quite often due to the movement of some hosts on the path. Therefore, finding a reliable routing path is an important issue. In this thesis, signal strength coefficient, node power coefficient and busy condition coefficients are calculated for route selection, to meet the request packet for establishing transmission path. Route selection value is calculated with above three coefficients for choosing steady routing path and backup path. It can reduce the break time and latency period, and increase packet arrival rate. The developed method in this thesis can choose the path with high stability and reduce the overall network load. The results of simulation showed that overall network performance has been improved.

    目錄 中文摘要 I Abstract II 誌謝 III 目錄 IV 圖目錄 VI 表目錄 VIII 第一章 緒論 1 1.1前言 1 1.2 研究動機與目的 3 1.3論文架構 4 第二章 文獻探討 5 2.1 無線網路簡介 5 2.1.1 無線隨意行動網路簡介 5 2.1.2 無線隨意網路路由協定 6 2.1.3 廣播、單播、群播 10 2.2 Dynamic Source Routing 12 2.3 Ad Hoc On-Demand Distance Vector Routing 13 2.4 AODV 和DSR 的比較 15 第三章 折衷式路徑選擇演算法 17 3.1 AODV 17 3.1.1 路徑請求封包 19 3.1.2 路徑回覆封包 20 3.1.2.1 輔助的路徑回覆封包 21 3.1.2.2 接收及傳送路徑回覆封包 22 3.1.3 路徑中斷封包 23 3.1.4 路徑重建 24 3.2 相關研究 27 3.2.1 AODV-BR 27 3.2.2 MAODV 28 3.3 路徑選擇演算法 29 3.3.1 路徑選擇值 31 3.3.2 路徑選擇 33 3.3.3 路徑修復 35 3.3.4 折衷式路徑選擇演算法 36 第四章 模擬驗證 39 4.1 模擬環境及方法 39 4.2 效能分析 40 4.2.1速度模擬 41 4.2.2 不同權重係數模擬 48 第五章 結論與後續研究建議 52 參考文獻 53

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