臺灣博碩士論文加值系統

本論文研製之目的乃是在於研究藍芽裝置與Wi-Fi裝置使用分時機制(TDD)共享設備頻寬情況下，Wi-Fi的網路效能。 TDD共存下，因天線切換，產生傳送失敗。傳統解決方案透過減少封包長度與802.11電源管理機制，緩和TDD機制下的傳送失敗問題。 本論文以802.11行動框架做為通知方法，通過封包交換確認彼此之使用時間，降低共存時封包的丟失，達到時間不浪費的目的，提升網路頻寬的使用率。 論文並從802.11網路拓樸效能分析參考文獻「Performance Analysis of the IEEE 802.11 Distributed Coordination Function」，加入TDD模型的各種參數，延伸出BT/Wi-Fi分時共存模型的網路效能公式與效能分析，最後透過802.11網路吞吐量模擬程式之模擬結果與分析結果吻合來支持論文之論點。

The purpose of this thesis is to study the Wi-Fi network performance under the situation that the Bluetooth device and the Wi-Fi device use the Time Duplex Division Mechanism (TDD) to share device bandwidth. In the coexistence of TDD Model, transmission failure occurs due to antenna switching. The traditional solution mitigates transmission failures under the TDD mechanism by reducing packet length and 802.11 power management mechanisms. This thesis uses the 802.11 action frame as a notification frame to indicate the time scheduling through packet exchange. It reduces packets loss, saves wasting time, and improves the utilization of network bandwidth under TDD model. From the 802.11 network topology performance analysis paper “Performance Analysis of the IEEE 802.11 Distributed Coordination Function”, this thesis adds various parameters of the TDD model, extending the network efficiency formula and performance analysis of the BT/Wi-Fi time-sharing coexistence model, and finally The paper's arguments are supported by the analysis results similar to the simulation results by network throughput simulator.

中文摘要
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英文摘要
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ii
誌謝
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iii
目錄
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iv
表目錄
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圖目錄
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符號說明
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vii
一、
緒論…………………………………………………………
1
1.1
前言…………………………………………………………
1
1.2
研究動機……………………………………………………
1
1.3
論文目標……………………………………………………
2
二、
研究內容與方法……………………………………………
3
2.1
研究範圍……………………………………………………
3
2.2
Wi-Fi傳送行為：A-MPDU (Aggregate MPDU)…………
3
2.3
Wi-Fi與藍芽共存機制與問題……………………………
4
2.4
TDD傳送失敗問題…………………………………………
4
2.5
傳統解決方案………………………………………………
5
2.5.1
BA Re-Size (BA重新交握)………………………………
5
2.5.2
論文解決方案………………………………………………
7
2.5.3
封包通知機制 Notice Frame Method (NFM)……………
7
三、
理論…………………………………………………………
9
3.1
網路拓樸……………………………………………………
10
3.2
Wi-Fi藍芽共存吞吐量公式推導…………………………
11
3.2.1
傳統模型共存吐量…………………………………………
12
3.2.2
NFM機制吞吐量……………………………………………
13
3.2.3
網路總吞吐量………………………………………………
14
四、
實驗部份……………………………………………………
16
4.1
實驗參數……………………………………………………
16
4.2
傳統競爭模型下之BT/Wi-Fi共存服務效能………………
18
4.3
RTS/CTS競爭模型下之BT/Wi-Fi混合服務效能…………
21
4.4
RTS+NFM競爭模型下之BT/Wi-Fi混合服務效能…………
24
五、
結論…………………………………………………………
28
參考文獻
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29

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