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.
