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研究生:劉育倫
論文名稱:非對稱鏈結行動隨意網路中一個新的廣播機制
論文名稱(外文):A New Broadcast Scheme for Mobile Ad Hoc Networks with Asymmetric Links
指導教授:許俊萍許俊萍引用關係
學位類別:碩士
校院名稱:明新科技大學
系所名稱:資訊管理研究所
學門:電算機學門
學類:電算機一般學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:43
中文關鍵詞:廣播風暴非對稱鏈結行動隨意網路
外文關鍵詞:Broadcast storm problemasymmetric linksMobile Ad Hoc Networks (MANETs)broadcast scheme
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在行動隨意網路中,網路廣播是一項基本且極為重要的機制,無論是路由選擇、網路狀態傳遞、服務來源尋找等服務,均依賴廣播來達成。最簡單的flooding廣播機制將會導致廣播風暴問題(broadcast storm problem)。多位學者已針對對稱性行動隨意網路提出多種解決方案來減緩廣播風暴所造成的問題,然而各家行動裝置無線網路卡的特性不同以及不同增益天線的使用,使得節點傳輸範圍不同,而形成非對稱鏈結行動隨意網路環境,因此,本論文首先將透過模擬分析現有廣播機制在節點選擇上是否有偏好哪種傳輸範圍的節點;並提出非對稱動態機率調整廣播機制以節點所處環境及傳輸範圍來動態調整轉播機率,讓大傳輸範圍節點得到較高的轉播機會,並比較接收到的訊號強度與節點自身的發送訊號強度大小來減少不必要的轉播。實驗證明ASAP廣播機制比現有廣播機制在非對稱鏈結網路環境可以獲得較佳效能表現。
In mobile ad hoc networks (MANETs), broadcasting is a common and important operation for providing network functions, such as route and service discoveries. Using naive flooding may cause broadcast storm problem. Many approaches have been proposed to mitigate this problem in MANETs with symmetric link. However, mobile devices use different wireless client adapters and antennas to cause asymmetric link, which has different transmission range. In this study, we used simulation to analyze previous approaches to find out the relationship between rebroadcast nodes and their transmission range in MANETs with asymmetric link. Then, we proposed a broadcast scheme called “ASymmetric Adjusted Probability scheme(ASAP)”. In order to cause long transmission range nodes which had higher probability to rebroadcast, ASAP adjusted probability dynamically according to degree and transmission range. Moreover, it eliminated unnecessary rebroadcast nodes by comparing RSS and TSS. The simulation results show that ASAP can offer better reachability, saved rebroadcast and latency as compared with other previous approaches.
摘 要 II
Abstract III
誌 謝 IV
目 錄 V
表目錄 VII
圖目錄 VIII
第一章 問題描述與研究動機 1
第二章  廣播風暴問題與現有解決方案 4
2.1 Probabilistic廣播機制 4
2.2 Counter-based 廣播機制 5
2.3 Distance-based 廣播機制 6
2.4 Location-based 廣播機制 7
2.5 Neighbor Coverage廣播機制 7
2.6 Efficient Counter-based廣播機制 8
2.7 Adjusted Probability廣播機制 9
2.8 現有廣播機制分析的結論 10
第三章 現有廣播機制在非對稱鏈結環境之分析 12
3.1 非對稱鏈結環境 12
3.2 模擬環境設定 13
3.3 效能評估項目 15
3.4 ECS、AP廣播機制在非對稱鏈結環境之分析 15
第四章 非對稱動態機率調整廣播機制 21
4.1 ASAP廣播機制參數說明 21
4.2 ASAP廣播機制運作流程 22
第五章 實驗分析 24
第六章 總結 40
參考文獻 41
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