在NLOS情形下透過高車來改善AODV的傳輸效能之研究

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姓名

楊翊辰(Yi-Chen Yang) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

在NLOS情形下透過高車來改善AODV的傳輸效能之研究
(The Study of Improving the Transmission Efficiency of AODV by Tall Vehicle under NLOS)

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摘要(中)

車聯網(Vehicular Ad-Hoc Networks)是連接具有移動性拓撲結構的移動車輛的隨意網絡，也因為這樣在連接性方面穩定性會比較低，借助網路(Internet)使得道路上的車輛可以與其他已連接上網路的車輛進行通信，藉由這種方法來分享彼此的車況來達到安全且有效率的駕駛，車對車(V2V)與車對基礎設施(V2I)是其主要的架構，當中也有許多問題值得探討。
但是，在某些道路上因為地形或建築物的關係而導致有視線遮蔽(Non line of sight)的情況，這會造成較大的封包遺失率從而導致封包接收率較低，因此我們在這篇論文提出了一個解決方法，透過高車(Tall Vehicle)來提高天線的高度從而改善傳播的效能，讓高車使用AODV (Ad hoc On-Demand Distance Vector Routing)進行群播將資訊傳給群內其他的車輛，使用不同的速度並加入Fading環境更加嚴峻，來比較有無使用高車傳播的差異，藉此證明高車可以明顯的優化在NLOS狀況下的傳播。

摘要(英)

Vehicular Ad-Hoc Networks is an organizational network that connects mobile vehicles with mobile topology. Because of this, the stability of connectivity is relatively low. With the help of the Internet, vehicles on the road can communicate with other ones. Vehicles connected to the Internet communicate to achieve safe and efficient driving by sharing each other’s conditions. Vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) are the main architectures. There are many issues about V2V and V2I worth discussing.
However, on some roads, due to the trees or buildings, there is a Non-line of sight (NLOS) situation, which will cause a large packet loss rate and lead to a lower packet reception rate. So in this thesis, we propose a solution to increase the height of the antenna through the Tall Vehicle to improve the propagation efficiency. The Tall Vehicle multicasts information with AODV (Ad hoc On-Demand Distance Vector Routing) to communicate with other vehicles in the group. By using different speeds and the addition of the Fading channel to make the environment worse, we can compare the difference between using tall-vehicle and not using it to prove that the tall-vehicle can obviously optimize the propagation under NLOS conditions.

關鍵字(中)

★ 車載隨意網路
★ 非視線傳輸
★ 高車
★ 無線隨意網路

關鍵字(英)

論文目次

中文摘要.....................................................................................................I
英文摘要...................................................................................................II
誌謝..........................................................................................................III
目錄..........................................................................................................IV
圖目錄.....................................................................................................VII
表目錄......................................................................................................IX
序論..............................................................................................1
前言..............................................................................................1
研究動機......................................................................................2
論文架構......................................................................................3
第二章相關研究背景..............................................................................4
2-1 車聯網架構簡介..........................................................................4
2-1-1 車聯網介紹........................................................................4
2-2 Ad hoc network for Vanet............................................................5
2-2-1 主動式路由DSDV............................................................6
2-2-2 主動式路由OLSR...........................................................10
2-2-3 被動式路由DSR.............................................................11
2-2-4 被動式路由AODV..........................................................12
2-3 VANET MAC Protocol..............................................................16
2-3-1 IEEE standards for VANET.............................................19
2-3-2 IEEE 802.11p...................................................................22
第三章系統情境與架構........................................................................27
3-1 NLOS與LOS環境...................................................................27
3-2 系統的架構及流程....................................................................30
3-2-1系統架構及規格...............................................................30
3-2-2系統流程圖.......................................................................33
3-3 Tall-Vehicle................................................................................34
第四章模擬與分析................................................................................35
4-1 模擬之參數................................................................................35
4-2 模擬結果與分析........................................................................36
4-2-1 無Fading的情況(m=∞)................................................36
4-2-2 有Fading的情況(m=1)..................................................39
第五章結論與未來研究之方向............................................................42
參考文獻..................................................................................................43

參考文獻

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指導教授

吳中實

審核日期

2020-7-20

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