Experimental Studies of the Mobile WiMAX Performances in a High-Speed Circuit Environment

[[abstract]]地面高速載具已成為未來公眾運輸系統中的主流趨勢。特別是乘客在高速鐵路(HSR)列車上長時間搭乘時，可能需要取用資料。然而，對於發展強固的通訊技術，以提供無縫隙的寬頻無線接取(BWA)服務夢想，仍存在極大的挑戰。目前較為接近商品化的寬頻無線接取服務系統，即是Mobile WiMAX。但是Mobile WiMAX是否具備足夠能力成為高鐵通訊之地面對列車通訊系統，這是非常值得研究的課題。主要的技術瓶頸在於高速移動環境對於Mobile WiMAX系統效能的影響程度。本論文中，我們呈現了就2.5GHz頻段Mobile WiMAX系統於高速移動環狀環境下的實驗，包括了傳輸效能(TCP Throughput)測試與換手時間延遲(Handover Latency)測試結果。[[abstract]]The terrestrial high-speed vehicle has become a major trend of the future public transportation systems, and especially in the high-speed rail (HSR) train for a long trip, passengers may need to access data through the networks. However, there is still a great challenge for the development of a robust communication system to provide the seamless broadband wireless access (BWA) services. At present, Mobile WiMAX is the BWA technology which has been realized as commercial products, and it is very worthy of studying the feasibility of whether the Mobile WiMAX can be used for HSR as the ground-to-train communication system or not. The primary technical issue is the capability of the Mobile WiMAX system under high-mobility conditions. In this paper, we present test results of the TCP throughput and handover latency from the experiment of 2.5GHz Mobile WiMAX system in high-speed circuit environments