高速鐵路環境下中繼器輔助換手系統之效能分析研究

Performance Analysis of Relay-Assisting Handover Schemes in High Speed Railway Scenarios

張瑋剛(Wei-Kang Chang)

指導教授 ： 吳燦明

中原大學/電機資訊學院/通訊工程碩士學位學程/碩士(2014年)

https://doi.org/10.6840/cycu201400422

摘要

在公共交通的快速發展之下,高速鐵路成為人們快速旅 行的一個選擇。在高速鐵路的環境底下,在車廂內與外界進 行通訊逐漸成為每一個乘客的需求。由於列車高速行駛的關 係,列車上的智慧終端將會更頻繁的處理換手 (Handover), 若無良好的換手機制,將會導致通訊的中斷。通訊的中斷會 使系統效能嚴重的下降。在本篇論文中,我們將注重換手的 觸發機率。我們結合了位置訊息和中繼器放大訊號的功能來 優化換手的效能。簡單來說,當火車同時達到兩個訊號交疊 的區域 (Overlap Area) 和中繼器的訊號範圍時,該區域的中 繼器會發射一個來自目標基地台的增強訊號,火車在接收增 強訊號之後,再來進行訊號強度的比較,這樣會使得換手成 功的機率提高,換手成功意味著訊號不中斷,也使得通訊的 品質獲得顯著的提升。

關鍵字

換手 ； 高速鐵路

並列摘要

With the development of the public transportation, the high speed railway becomes a solution for people who want to reach their destination much further faster. Communication on the train over the high speed railway scenario becomes passengers’ needs. Due to more frequent handover in broadband wireless communica- tion in the high speed railway scenario, communication interrupts, while handover could lead to severe performance degrade. In this thesis, we focus on the handover triggered probability. Handover probability and handover failure probability will be derived. More- over, we propose a scheme based on position information and relay assisting to optimize the performance of handover. When the train arrives both overlap area and relay cell, the relay will send an en- hanced signal to the train. This enhanced signal will assist to fit the minimal criterion of the handover.

並列關鍵字

handover ； high speed railway

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