| 摘要: | 為解決日益增加的行動數據的需求，電信運營商均以新增基站(BaseStation)或採優化自家無線網路的方式解決，最後付出一筆費用後，結果卻不如預期中的理想。為改善室內涵蓋與提昇自家無線網路的服務品質，陸續端出新設備，ex: Repeater、Small Cell、 Femtocell、WiFi等解決方案，來滿足廣大客戶的需求。如何瞭解既有無線網路的佈建缺失及未來引進新設備的規劃使用，與對既有無線網路的影響程度，將會是下階段電信業者所要多考慮的。為瞭解目前無線網路覆蓋的狀態，除了從模擬(Simulation)程式中得到的訊號涵蓋結果外，另一個方式就是路測(Drive test)，此方式採KPI的方式進行研判，但對於因環境改變所引起的訊號變化，卻沒有太多的說明。
本研究將在WiMAX基站(Basestation)的有效涵蓋區域與差異化之環境下，執行實地量測RSSI(Received Signal Strength Indicator；接收信號強度指示)、FTP Down Link throughput(FTP下載流量)的可靠性能測試，並計算出量測區的Path Loss(路徑損耗)即可對於無線訊號之強度因環境差異化所造成的變化，進行資料分析。藉此，經由現場實地量測所得到的經驗與結果，對往後電信業者於佈建基站(BaseStation)的環境選擇與天線方向的擺放與角度的設計，有進一步的參考貢獻。
關鍵字：WiMAX，RSSI，Simulation，Basestation，基站位置，覆蓋率，Path Loss，天線方向
To address the increasing demand of mobile data, mobile operators often add Basestations or adopt its own wireless network optimization solution. But they usually find that the result is not as good as expected ideals after paying big expenses. To improve indoor coverage and enhance the service quality of its own wireless network to meet the needs of users, the mobile operators bring in new equipments one after another, for example, Repeater, Small Cell, Femtocell, WiFi and other solutions. Comprehensive understanding the deficiencies of existing wireless network provisioning, introducing new equipments to implement the plans, and evaluating the impact on the existing level of wireless networks will be the subjects that mobile operators have to consider more deliberately in the next phase. There are some methods to understand the current state of wireless network coverage, for example, signal cover results obtained from Simulation program and road test, adopted by KPI judged. However, the variations of signal caused by environmental changes are left behind illustrations.
This study, under the effective coverage area and differential environment of WiMAX Basestation, implemented on-site measurements RSSI (Received Signal Strength Indicator
received signal strength indication) and FTP Down Link throughput (FTP download traffic) to test the reliability and calculate the Path Loss of measurement area, and then analyzing the strength of the wireless signal differences caused by environmental changes. Thus, the test results of these on-site field surveys would be a benefit for operator in environmental selecting of BaseStation provision, choosing placement of antenna orientation, and angle design, with further reference contributions.
Keywords: WiMAX, RSSI, Simulation, Basestation location, Coverage, Path Loss, Antenna |
