IEEE802.11n 無線網路支援行動應用能力之研究

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Title:	IEEE802.11n 無線網路支援行動應用能力之研究
Other Titles:	The application and capability research of IEEE802.11n WLAN in a mobile networking environment
Authors:	林玫芳;Lin, Mei-fang
Contributors:	淡江大學資訊管理學系碩士在職專班梁德昭;Liang, Te-chao
Keywords:	IEEE802.11n;無線行動網路;正交分頻多工;多輸入多輸出;IEEE802.11n;Wireless Mobile Network;Orthogonal frequency division multiplexing (OFDM);Multiple Input Multiple Output (MIMO)
Date:	2009
Issue Date:	2010-01-11 04:50:59 (UTC+8)
Abstract:	隨著人類對於網際網路依賴程度的增加以及便利性和行動性的需求，無線區域網路已廣泛應用於行動裝置產品。以目前的無線行動寬頻網路技術如3.5G (HSDPA)及Mobile WiMAX而言，其最大上行傳輸速率皆未達4 Mbps，效能明顯不足。然而，IEEE802.11n使用正交分頻多工(OFDM)及多輸入多輸出(MIMO)為技術核心，傳輸速率最高達600 Mbps，目前其運作模式皆為靜止式網路。因此，若能將IEEE802.11n高傳輸頻寬之優勢應用至行動通訊中，勢必可提供業界做更多元之發展。本研究係透過實驗室實驗法，分別以IEEE802.11n單一基地台、跨基地台、高密度基地台和超高密度基地台四種架構模式，使用可程式化訊號衰減切換器於各架構模式之訊號覆蓋範圍內模擬行車時速，並利用封包模擬器分析資料(TCP/IP)、影音(IPTV)及語音(VOIP)的網路服務效能。經由實驗結果顯示，IEEE802.11n可應用於行車上網環境，其TCP/IP效能在時速50-60公里時，透過提高基地台訊號的覆蓋密度，傳輸流量優於IEEE802.11g的靜止傳輸模式；於時速40公里以下之高密度模式行車環境中，其IPTV及VOIP仍然能夠維持基本移動通訊品質。因此，經由效能及行動應用能力分析顯示，IEEE802.11n不但可應用於公車或輕軌列車等時速40公里以下之行車上網環境，而且對於無線行動寬頻網路產業之未來應用極具參考價值。 Since human beings demand the mobile lifestyle and convenience based on internet technology, the Wireless LAN Networks have been extensively incorporated in the Mobile Internet Devices. In comparison to the other Wireless Broadband Technology such as 3.5G (HSDPA) and Mobile WiMAX, the maximum transmission rate of 3.5G (HSDPA) and Mobile WiMAX is apparently insufficient (i.e. less than 4 Mbps in the upstream). However, as IEEE802.11n is implemented with OFDM (Orthogonal Frequency Division Multiplexing) and MIMO (Multiple Input Multiple Output) technology, the maximum transmission rate can reach up to 600 Mbps which is primarily utilized in the Fixed Networking Environment. Hence, provided that the advantage of IEEE802.11n bandwidth can be adopted in the Mobile Communication, the “True” High- Performance Mobility can be realized for the industry of Information Communication Technology. The Research is performed through the LAB methodology. Under the Single Access Point, Multiple Access Point, High-Density and Ultra High-Density Access Point architecture, we emulate the vehicular ratio within the signal coverage of each operating mode via the programmable signal attenuators and then analyze the performance of TCP/IP, IPTV and VOIP. As depicted in the LAB result, IEEE802.11n can be adopted in the Vehicular Internet Environment. Under the High-Density Access Point mode, the performance at the speed ratio of 50 to 60 KM/HR can be better than IEEE802.11g operated in the Fixed Networking Environment; while in the vehicular environment of 40 KM/HR, the IPTV and VOIP can remain basic mobile communication quality. The application and capability analysis result proved that IEEE802.11n not only can be adopted in the Public Shuttle Bus and Lightweight Transit Rail system, but also provide a valuable reference for the Mobile Wireless Broadband Industry.
Appears in Collections:	[Graduate Institute & Department of Information Management] Thesis

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