無線行動隨意網路是一種特殊之網路架構，網路拓樸不需預先建構網路相關基礎設備即可進行資訊之交換，也因為少了網路基礎設備的幫助，因此產生以下問題：節點裝置傳輸範圍有限、網路拓樸變化迅速、節點能源不足、網路頻寬限制…等。此外，為了因應高速移動性的車載環境，進而發展出車載網路，在車載網路的高度變異性環境中，由於車輛的快速移動與周遭建築物的阻礙，使得節點之間能夠維持通訊的時間相當短暫。另一方面，隨著智慧型手機的盛行，人們對於UMTS行動網路的需求也逐漸增加，然而，在行動網路的頻寬不足下，當使用者要下載檔案時，可能會有存取速度過慢的情形發生。
本論文以無線網路頻寬議題為主軸，結合智慧型手機與車載網路，提出一新奇的UMTS/VANET網路整合架構。我們主要提出Requester/Helper之概念，當Requester想要下載檔案時，可透過鄰近的Helper使用閒置的UMTS網路幫忙下載，同時將資料利用DSRC傳送給Requester，可有效縮短Requester下載檔案的時間。此外，我們的機制亦考量到智慧型手機的電池能量與車輛的移動性，根據電池能量、車輛的移動性過濾掉某些不適合的使用者，Requester進而從中挑選出評分較高的使用者當作Helper。當Requester完成檔案後，亦可將檔案透過DSRC分享給其他使用者，可有效縮短獨自下載同一檔案的時間。

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第1章 導論 1
1.1 簡介 1
1.2 研究動機 4
1.3 論文架構 5
第2章 相關背景與研究 6
2.1 IEEE 802.11 Family 6
2.1.1 IEEE 802.11a 6
2.1.2 IEEE 802.11b 7
2.1.3 IEEE 802.11g 7
2.1.4 IEEE 802.11n 8
2.2 車載網路 9
2.3 專屬短距無線通訊 12
2.4 無線廣域網路 13
2.4.1 通用行動通訊系統 13
2.4.2 高速下行封包存取 14
2.4.3 高速上行封包存取 16
2.5 多重輸入多重輸出 17
2.6 無線電能量消耗模組 19
2.7 Ad-hoc On-demand Distance Vector (AODV) 20
2.8 Flow Oriented Routing Protocol (FORP) 22
第3章 研究方法 24
3.1 情境假設 25
3.2 機制流程 26
3.3 建構時期 27
3.3.1 Candidates Search 27
3.3.2 Information Report 27
3.3.3 Helpers Selection 29
3.4 維護時期 33
3.5 多躍式傳輸 34
第4章 模擬與效能分析 39
4.1 模擬環境與參數設定 39
4.2 評測項目 42
4.3 模擬圖表及討論 43
4.3.1 Helper數量與網路效能之分析 43
4.3.2 移動速度與網路效能之分析 44
4.3.3 Hop數與網路效能之分析 48
第5章 結論 50
參考文獻 51

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