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研究生： 蘇雯琪
Su, Wun-Ci
論文名稱： 稀疏車載網路環境中網路修復時間之研究
Accurate Analysis of the Re-Healing Time for Sparse Vehicular Ad Hoc Networks
指導教授： 黃政吉
Huang, Jeng-Ji
學位類別： 碩士
Master
系所名稱： 電機工程學系
Department of Electrical Engineering
論文出版年： 2012
畢業學年度： 100
語文別： 中文
論文頁數： 45
中文關鍵詞： 車載隨意網路 、專用短距離通訊 、網路連接性 、安全訊息 、路間單元
英文關鍵詞： VANETs, DSRC, network connectivity, safety message, roadside units (RSUs)
論文種類： 學術論文
相關次數： 點閱：216  下載：10 
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    • 車載網路（VANET）為智慧型運輸系統（Intelligent Transportation System, ITS）之應用的發展關鍵，其中用於提升行車安全的車輛安全應用最為重要。安全應用之運作方式，是由發生事故之車輛不斷地利用訊號廣播，以達到警告周遭車輛之目的。本論文以高速公路為探討環境，分析因車流密度造成網路不完全連接而導致的訊息傳送延遲，除了使用雙向車道之環境特性以減少網路修復時間，並以更為精準之機率密度計算方式，討論其網路修復時間，以提供數值化之車輛隨意網路延遲解析。模擬結果顯示，本論文提出之分析作法與模擬結果高度相符，不但修正過去文獻使用之分析方式於低密度環境下產生之錯誤結果，並且也大幅改善延遲分析之準確度。

    The development of VANET is crucial for the applications of Intelligent Transportation System (ITS) to, e.g., improving safety of driving. That is, warning messages can periodically be broadcast to inform neighboring vehicles when an emergency event occurs. In this thesis, we analyze the transmission delay of warning messages resulting from the disconnected network when traffic density is low on a bidirectional highway. When a disconnection occurs, vehicles moving in the opposite direction help to restore the connectivity of VANET. We provide accurate analysis to calculate the re-healing time, the average time during which a disconnected VANET can be restored. Simulation result shows that our analysis achieves very accurate results.

    中文摘要....................................................i 英文摘要...................................................ii 誌　　謝..................................................iii 目　　錄....................................................v 圖 目 錄..................................................vii 表 目 錄.................................................viii 第一章 緒論...............................................1 1.1 研究背景................................................1 1.2 研究動機與目的...........................................2 1.3 其他相關研究.............................................4 1.4 論文架構................................................5 第二章 車載隨意網路（VANET）相關領域..........................6 2.1　智慧型運輸系統（ITS）....................................6 2.2　無線隨意網路（wireless ad hoc network）..................7 2.3　行動隨意網路（MANET）...................................11 2.4　VANET網路特性與通訊型態.................................12 2.4.1　網路特性............................................13 2.4.2　通訊型態............................................14 2.5　專用短距離通訊（DSRC）與車用環境無線存取（WAVE）............14 2.6　車載網路之應用..........................................16 第三章 數值分析...........................................18 3.1　背景環境介紹...........................................18 3.2　網路修復時間（rehealing time）..........................22 3.2.1　Case 1.............................................22 3.2.2　Case 2.............................................25 3.2.2.1　Case 2.1　N=0....................................28 3.2.2.2　Case 2.2　N>0....................................32 3.2.3　小結................................................35 第四章 模擬結果與討論......................................36 4.1　環境參數..............................................36 4.2　re-healing time分析與模擬..............................38 第五章 總結..............................................42 5.1　結論..................................................42 參考文獻...................................................43

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