運用UWB提升MANET上檔案分享之效能

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姓名

張廷亭(Ting-Ting Chang) 查詢紙本館藏

畢業系所

資訊管理學系

論文名稱

運用UWB提升MANET上檔案分享之效能
(Performance enhancement of the P2P file sharing on MANET by using UWB)

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摘要(中)

隨著無線技術的發展，目前現有的行動裝置可以進行點對點傳輸，並且可由行動裝置互相連結形成一網路架構，這樣的網路架構稱之為行動隨意網路。其可讓行動裝置互相連結進行資料的分享。
在P2P檔案分享機制中，已提出使用藍芽技術作為行動隨意網路中節點傳送檔案之媒介。然而，藍芽技術本身僅使用輪詢時間，致使在P2P檔案分享機制的回應時間較長，進而影響成功率。目前的無線傳輸中的超寬頻技術，具備體積小、成本低、低耗電與高速傳輸的特性，在資料傳輸上，除與藍芽相同的輪詢方式外，還提供競爭存取期間用以緩解節點間對傳輸頻寬供需不一的情形，可降低回應時間，進而提高成功率。
本研究係以運用超寬頻技術在MANET上進行P2P檔案分享的效能研究，利用超寬頻技術之特性，以提升藍芽技術為連線方式的效能。超寬頻技術除110Mbps的傳輸速率外，尚具備以下兩項特性：首先，除具有與藍芽有相同的輪詢方式外，尚有競爭存取期間可進行傳輸；其次，Piconet中的DEV (Device)裝置可直接進行傳輸，不需藉由Piconet的PNC (Piconet Coordinator)裝置幫助轉傳。本研究針對上述之特性，分別提出適時傳輸模式與資料封包對傳機制，前者主要依據現在的傳輸時間決定較佳的傳輸方式；後者則使得資料封包以較短之路徑回覆至要求者。
根據模擬實驗之結果觀察超寬頻技術之改善率，從檔案長度之模擬中可觀察出，超寬頻平均成功率為90.23%，而藍芽平均成功率為46.96%，可見超寬頻於檔案長度模擬中之優勢，並可顯示出超寬頻適合應用於大檔案之傳輸；從資料要求數之模擬中觀察，超寬頻平均成功率為88.24%，而藍芽平均成功率為67.52%，可見超寬頻有效改善成功率。於回應時間部份，超寬頻於檔案長度平均花費0.42秒與資料要求數平均花費0.19秒，遠小於藍芽20.66秒與61.9秒的回應時間，由平均成功率與平均回應時間之改善幅度證實運用超寬頻技術可有效提升其效能。

摘要(英)

As wireless technology advances, mobile devices currently can be connected by wireless technology, they can form a network architecture which is called mobile ad hoc networks. The mobile ad hoc networks allow mobile devices to form a network structure. Mobile devices through the network structure can get some digital information from other devices.
In P2P file sharing mechanisms, it has been proposed to use Bluetooth technology to share files. However, the Bluetooth technology only uses polling time. Due to the reason, the response time of P2P sharing mechanisms increases. At the same time, we find UWB technology has characteristics with small size, low cost, low power consumption and high-speed transmission. Compare with Bluetooth technology, UWB has additional contention access period to share file. It can reduce response time and improve the success rate.
The purpose of this study is enhance performance of the P2P file sharing on MANET by using UWB; and use UWB characteristics to reduce response time and improve the success rate. There are two extra characteristics of UWB. First, In addition to the period of CTA, UWB can use contention access period to transmit packets. Second, this study considers the characteristics of DEVs in the same Piconet can transmit packets with each other. Based on the above characteristics, we propose two mechanisms. One mechanism can choose better time period to transmit packets, and the other mechanism can transmit packets with short path.
According to the simulation result, the above-mentioned mechanisms can improve the success rate and reduce response time.To confirm the use of UWB technology can effectively enhance their performance.

關鍵字(中)

★ 超寬頻
★ 微網
★ P2P

關鍵字(英)

★ P2P
★ Piconet
★ UWB

論文目次

摘要 i
Abstract ii
目錄 iii
圖目錄 vi
表目錄 ix
一、緒論 1
1-1 研究背景 1
1-2 研究動機 2
1-3 研究目的 3
1-4 論文架構 3
二、背景與相關研究 5
2-1 超寬頻技術 5
2-1-1 802.15.3 MAC基本元件與傳輸方式 6
2-1-2 連線程序流程與要求CTA程序流程 9
2-1-3 競爭存取期間及其CTA時段傳送封包運作簡介 12
2-1-4 Dependent Piconet介紹 12
2-1-5 超寬頻應用領域 14
2-2 P2P檔案分享 15
2-2-1 P2P概念 15
2-2-2 P2P檔案分享機制 16
2-2-3 藍芽P2P檔案分享機制 17
2-3 超寬頻與藍芽技術比較 21
三、運用UWB提升MANET上檔案分享之效能 22
3-1 規範Superframe時間 23
3-2 檔案分享機制 26
3-2-1 封包類型簡介 27
3-2-2 平時資料清單交換 28
3-2-3 資料找尋 29
3-2-4 資料要求路徑記錄 29
3-2-5 逾時處理 36
3-2-5-1定義預期資料封包回覆時間 36
3-3 UWB封包傳送機制 41
3-3-1 適時傳輸模式 41
3-3-2 資料封包對傳機制 44
3-3-3 逾時處理修正機制 48
四、實驗方法與分析 50
4-1 模擬場景設定 50
4-2 模擬結果分析 51
4-2-1 節點總數的效應 51
4-2-2 資料擁有數的效應 53
4-2-3 檔案長度的效應 56
4-2-4 資料要求數的效應 59
4-2-5 傳輸速率為10Mbps之模擬結果 63
4-2-5 實驗模擬改善率 65
4-2-5-1 節點總數對於成功率與回應時間之效能改良率之影響 65
4-2-5-2 資料擁有數對於成功率與回應時間之效能改良率之影響 65
4-2-5-3 檔案長度對於成功率與回應時間之效能改良率之影響 66
4-2-5-4 資料要求數對於成功率與回應時間之效能改良率之影響 67
4-3 藍芽3.0、藍芽4.0與超寬頻技術分析 67
五、結論 69
5-1 研究結論 69
5-2 未來研究 71
六、參考文獻 72

參考文獻

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指導教授

蘇坤良(Kuen-liang Sue)

審核日期

2010-7-25

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