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研究生:何錦淮
研究生(外文):Ching-Huai Ho
論文名稱:Wi-Fi裝置在5GHz頻段頻道配置機制之探討
論文名稱(外文):Investigation of channel allocation mechanism for Wi-Fi devices at 5GHz band
指導教授:林信標林信標引用關係
指導教授(外文):Hsin-Piao Lin
口試委員:劉建宏鄭献勳
口試委員(外文):Chien-Hung LiuShiann-Shiun Jeng
口試日期:2013-12-20
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電腦與通訊研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:69
中文關鍵詞:Wi-Fi干擾頻道配置802.11ac802.11n
外文關鍵詞:Wi-Fiinterferencechannel allocation802.11ac802.11n
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本論文主要探討無線保真(Wireless Fidelity;Wi-Fi)裝置在5GHz頻段的干擾問題與頻道配置機制,802.11ac標準在80 MHz的工作頻寬下與802.11a/n標準的20/40MHz頻寬通道重疊的情況會經常發生。本論文想藉由實際802.11a/n與802.11ac干擾的量測實驗,來探討802.11ac產品普及後所即將面臨的問題。
在本論文中分別使用無線網路晶片大廠Atheros平台的無線網卡與Broadcom平台的無線基地台,在四種基礎建設模式(Infrastructure mode)架構下的設置,用來模擬實際開放空間多個使用者使用相同頻道通訊時,所產生的干擾現象。在5GHz頻段802.11a/n分別對802.11n/ac的六種連線干擾情境下,量測出實際的無線網&;#63799;卡效能,利用量測吞吐量的大小作為實驗的效能評估依據。
實驗結果顯示當802.11n使用者互相重疊頻道時,效能皆會大幅下降30%~70%。當802.11n使用者與802.11ac使用者次要頻道重疊時效能會大幅下降92%~97%。另外本論文建立一種用於802.11n的頻道配置機制,並藉由第三方韌體打開無線基地台軟體環境執行演算法程式,並且根據量測實驗結果做為程式判斷依據,除了在面對相同頻道有其他使用者時能夠去選擇其他空閒的頻道,還能夠優先選出對802.11n衝擊較小的802.11a頻道來使用,使吞吐量效能提升將近36%。


This thesis focuses on investigating Wi-Fi devices interference and channel allocation mechanism at the 5GHz band. The overlap with the 802.11a/n standards 20/40MHz bandwidth channel occurs frequently when set to 80 MHz bandwidth on 802.11ac standard. This thesis would like to discuss the interference problems between 802.11a/n and 802.11ac by measurement experiments for the upcoming 802.11ac products.
In this thesis, we use the Wi-Fi card with chipset maker Atheros platforms and wireless base station with Broadcom platform respectively. We use four kinds of infrastructure mode settings to simulate the interference phenomenon rising from actual communication condition in open space with multiple users using the same frequency channel. When set to 5GHz band on 802.11a/n and 802.11n/ac respectively, we use six kind of connection interference scenario to evaluate the Wi-Fi card performance by measuring throughput.
The experimental results show that when the 802.11n users overlapping channels to each other, the performance will be substantially decreased around 30% to 70%. When 802.11n device working on 802.11ac secondary channel, 802.11ac device performance will be significantly decreased around 92% to 97%. In this thesis we also use third-party firmware to enter the wireless base station software environment and run a shell script for 802.11n channel selection. When users use the same channel with another user, the shell script will choose to use other free channels automatically. This could improve throughput performance near 36%.


摘 要 ....................................... i
ABSTRACT .................................... ii
誌 謝 ....................................... iv
目 錄 ....................................... v
表目錄 ...................................... vii
圖目錄 ...................................... viii
第一章 緒論 .................................. 1
1.1 前言 ..................................... 1
1.2 研究動機 ................................. 2
1.3 研究方法 ................................. 2
1.4 論文架構 ................................. 3
第二章 無線區域網路概述 ...................... 4
2.1 802.11n概述 .............................. 4
2.2 5GHz頻帶使用頻道與發射頻譜遮罩 ........... 5
2.3 802.11ac概述 ............................. 8
第三章 量測環境架設與實驗分析 ................ 12
3.1 測試設備與量測系統架構 ................... 12
3.2 量測工具與軟硬體設定 ..................... 16
3.3 802.11a/b/g/n在辦公室環境下效能測試分析 .. 22
3.3.1 802.11b/g/n效能測試分析 ................ 22
3.3.2 802.11a/n/ac效能測試分析 ............... 24
3.4 5GHz頻道重疊使用干擾情況下的效能分析 ..... 27
3.4.1 量測情境說明 ........................... 29
3.4.2 六種干擾情境下量測結果與分析 ........... 33
第四章 頻道配置機制之研究與驗證 .............. 40
4.1 避開使用中頻道之實驗方法 ................. 40
4.1.1 刷新無線路由器為第三方韌體DD-WRT之研究 . 41
4.1.2 頻道配置演算法程式撰寫之研究 ........... 44
4.1.3 在第三方韌體中執行shell script程式 ..... 48
4.2 頻道配置機制演算法驗證與量測 ............. 50
4.2.1 手動執行頻道配置機制演算法程式之驗證 ... 50
4.2.2 定時執行頻道配置機制演算法程式之驗證 ... 54
第五章 結論與未來展望 ........................ 56
參考文獻 ..................................... 57
附錄 ......................................... 60

[1] IEEE Std 802.11a-1999, “Supplement to IEEE Standard for Local and metropolitan area networks— Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications High-speed Physical Layer in the 5 GHz Band,” 1999.
[2] IEEE Std 802.11b-1999, “Supplement to IEEE Standard for Local and metropolitan area networks Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Higher-Speed Physical Layer Extension in the 2.4 GHz Band,” Sept. 1999.
[3] IEEE Std 802.11g-2003, “IEEE Standard for Local and metropolitan area networks Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 4: Further Higher Data Rate Extension in the 2.4 GHz Band,” Jun. 2003.
[4] IEEE P802.11n/D9.0, “Draft STANDARD for Local and metropolitan area networks Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 5: Enhancements for Higher Throughput,” Mar. 2009.
[5] IEEE P802.11ac/D3.0, “Draft STANDARD for Local and metropolitan area networks Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 4: Enhancements for Very High Throughput for Operation in Bands below 6 GHz,” Jun. 2012.
[6] S. Lakshmanan, J. Lee, R. Etkin, Sung-Ju Lee, and R. Sivakumar, “Realizing High Performance Multi-radio 802.11n Wireless Networks,” in Proc. 8th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks (SECON), Jun. 2011, pp. 242-250.
[7] Stanley W.K. Ng and T.H. Szymanski, “Interference measurements in an 802.11n Wireless Mesh Network testbed,” in Proc. 25th IEEE Canadian Conference on Electrical &; Computer Engineering (CCECE), Apr. 29 2012-May 2 2012, pp. 1-6.
[8] A. Zubow and R. Sombrutzki, “Adjacent channel interference in IEEE 802.11n,” in Proc. IEEE Wireless Communications and Networking Conf. (WCNC), Apr. 2012, pp. 1163-1168.
[9] P. Szulakiewicz, R. Kotrys, M. Krasicki, P. Remlein, and A. Stelter, “OFDM Interfering Signal Rejection From 802.11ac Channel,” in Proc. IEEE 23rd International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), Sept. 2012, pp. 2015-2018.
[10] http://www.wi-fi.org/files/kc/WFA_802_11n_Industry_June07.pdf
[11] Shoa-Yei Yeong, Wafaa Al-Salihy, and Tat-Chee Wan, “Indoor WLAN Monitoring and Planning using Empirical and Theoretical Propagation Models,” in Proc. Second International Conference on Network Applications Protocols and Services (NETAPPS), Sept. 2010, pp. 165-169.
[12] http://www.litepoint.com/whitepaper/80211ac_Whitepaper_tch.pdf
[13] Stacey, R. et al., Specification Framework for TGac, IEEE 802.11-09/0992r13, Jul. 2010.
[14] M. X. Gong, B. Hart, L. Xia, and R. Want, “Channel Bounding and MAC Protection Mechanisms for 802.11ac,” in Proc. IEEE Global Telecommunications Conf., Dec. 2011, pp. 1-5.
[15] M. Park, “IEEE 802.11ac: Dynamic Bandwidth Channel Access,” in Proc. IEEE International Conference on Communications, Jun. 2011, pp. 1-5.
[16] 楊曜隆,無線網&;#63799;技術應用於802.11n效能評估與分析,碩士論文,國立中央大學,桃園,2008。
[17] Sandra Sendra, Pablo Fernandez, Carlos Turro, and Jaime Lloret, “IEEE 802.11a/b/g/n Indoor Coverage and Performance Comparison,” in Proc. IEEE 6th International Conference on Wireless and Mobile Communications (ICWMC), Sept. 2010, pp. 185-190.
[18] http://www.qualcomm.com/media/documents/files/ieee802-11ac-the-next-evolution-of-wi-fi.pdf
[19] C. Yeow Yeoh, “Anomaly-aware IP Scheduler with Admission Control for 802.1 in Base Station,” in Proc. HONET 2008. International Symposium on High Capacity Optical Networks and Enabling Technologies, Nov. 2008, pp. 57-62.
[20] http://www.freeos.com/guides/lsst/ch01sec06.html
[21] DD-WRT WiKi, http://www.dd-wrt.com/wiki/index.php/Main_Page
[22] DD-WRT, http://www.dd-wrt.com/site/index
[23] DD-WRT forum, http://www.dd-wrt.com/phpBB2/
[24] http://linux.vbird.org/linux_basic/
[25] http://www.freeos.com/guides/lsst/


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