在第三代行動通訊網路中，為解決行動使用者可以在任何時間，任何地點作高速率的資料傳輸，故延伸使用4G技術也就是WiMax行動網路。此技術結合了行動通訊與IP網路，整合成一個IP語音通訊的行動網路世界，也就是IEEE 802.16，發展至今已到了IEEE 802.16e為行動通訊網路。此技術提供給使用者能在行動通訊世界中與IP網路互相通訊，達到高頻寬資料存取的效率。 本論文主要目標為提出一個以IEEE 802.16e的實體量測環境，提出實際對直視性(LOS)與非直視性(NLOS)的地形環境，以台灣地形為環境量測出定點與非定點的實際資料傳輸之速率與訊號強度，以便提供出一個參考依據。經實測數據可知在LOS環境下，訊號強度於-70dbm能保持資料傳輸品質，在NLOS環境下，訊號強度於-80dbm能保持資料傳輸品質。本研究也找出在LOS環境下最適合台灣地形的無線傳播模型為艾賽克模型B，在NLOS環境下最適合台灣地形的無線傳播模型為COST-231華爾費思－池上模型。 再者，由實測結果本研究也提出站台與站台之間在何種訊號強度下需要做換手機制的建議，期望本論文研究能對於第4代行動通訊網路(WiMax)能有所貢獻。 In the third generation mobile communication network, the solution for mobile users may proceeded the high speed data communication in any time, any place, Therefore, mobile communication technology extends to use the 4G technology which is also called the WiMax mobile network. This technology integrated the mobile voice communication and the IP network to construct The IP/voice mixed communication in the same mobile network. This is IEEE 802.16 serious. The newest development of this protocol is already to IEEE 802.16e. This technology provides the user the high efficiency of bandwidth for data access in the mobile IP network mutually communication.
The essential target of the paper is to propose the actual IEEE 802.16e measurement environment including the line of sight (LOS) and non-line of sight (NLOS) environments in typical urban district area in Taiwan. Both of the fixed point and the non-fixed-point (moving) mobile stations were measured. In order to provide the reference data to the service provider and system integrator, the measurement of data transmission speed and the signal intensity were recorded.
The conclusion of the emulation results can be stated as: 1. for the LOS environment, the data transmission quality can be maintained in - 70dbm of signal intensity; 2. for the NLOS environment, it is - 80dbm of signal intensity. We also proposed the best fitting model in our analysis which would be the suitable model in the urban district area in Taiwan. For the LOS environment, the Erceg model B shows the best result. For the NLOS environment, COST-231 Walfish-Ikegami model would be suggested.
Regard to the result of the transmission speed, we proposed the reference of the signal level which system integrator should consider to have the handover mechanism between cells. We wish this paper could make contribution to the 4th generation (WiMax) mobile communication network in Taiwan.
