【摘要】：隨著社會經濟的發(fā)展，移動通信已經深入到人們日常工作和生活的每個角落，人們對移動通信的依賴性越來越強，通信質量的要求也越來越高。目前2G、3G通信系統已經能滿足人們日常工作和生活的無線通信需求，而在高速運行、客流集中、業(yè)務容量高、部署場景復雜的高鐵內提供高質量的通信服務，成為高鐵通信網建設和發(fā)展面臨的重大挑戰(zhàn)。2010年我國提出發(fā)展基于LTE的鐵路寬帶無線通信系統LTE-R，將OFDM、MIMO等關鍵技術應用于高鐵寬帶無線通信，，為鐵路運營管理提供安全、可靠、高效的通信系統，為列車上的旅客提供優(yōu)質的語音、多媒體接入和上網娛樂等服務，提升出行體驗。 切換技術作為LTE系統的關鍵技術之一，能有效地保證用戶的通信質量。如果切換過早會產生乒乓效應，切換過晚會造成無線鏈路連接中斷，產生掉話現象，因此需要研究適應于高鐵環(huán)境的快速可靠的切換算法。 本文首先介紹了高鐵發(fā)展的現狀和LTE技術的主要性能和優(yōu)勢，描述了LTE的網絡架構，對LTE包含的各個網元的功能與作用進行了介紹，其中重點介紹了LTE在組網架構和網元職能上的改進。然后介紹了LTE系統中的4種關鍵技術，包括OFDM技術、MIMO技術、切換技術和混合自動重傳HARQ技術，其中重點介紹了切換技術。接著介紹了列車的高速移動給鐵路寬帶無線通信系統帶來的一系列關鍵問題，提出了LTE高鐵組網關鍵技術，最后提出一種基于列車運行方向和運行速度進行切換的算法，并通過Matlab進行仿真和分析。 本文主要對高鐵環(huán)境下LTE的切換算法進行研究，對切換過程中涉及到的測量參數、濾波參數和控制參數等進行分析和優(yōu)化，提出適合高速鐵路環(huán)境的切換算法，并進行仿真驗證，仿真結果表明，改進的切換算法能更好地適應高鐵環(huán)境，提高切換的成功率，有效地防止乒乓切換和無線鏈路連接失敗，為高鐵提供安全、可靠的寬帶無線通信。
[Abstract]:With the development of social economy, mobile communication has penetrated into every corner of people's daily work and life. People rely more and more on mobile communication, and the quality of communication is becoming more and more high. At present, the 2GN 3G communication system has been able to meet the wireless communication needs of people's daily work and life, while high quality communication services are provided in high-speed trains with high speed operation, concentrated passenger flow, high service capacity, and complex deployment scenarios. In 2010, China proposed to develop the railway broadband wireless communication system (LTE-R,) based on LTE to apply OFDM,MIMO and other key technologies to high-speed railway broadband wireless communication. It provides safe, reliable and efficient communication system for railway operation and management, provides high-quality voice, multimedia access and Internet entertainment services to train passengers, and improves travel experience. As one of the key technologies of LTE system, handoff technology can effectively guarantee the communication quality of users. If the handoff is too early, the ping-pong effect will be produced, and the wireless link will be interrupted after the handover. Therefore, it is necessary to study a fast and reliable handoff algorithm suitable for the high-speed railway environment. This paper first introduces the current situation of high-speed rail development and the main performance and advantages of LTE technology, describes the network architecture of LTE, and introduces the functions and functions of each network element included in LTE. The paper mainly introduces the improvement of LTE in network structure and network element function. Then four key technologies in LTE system are introduced, including OFDM technology, MIMO technology, handoff technology and hybrid automatic retransmission HARQ technology. Then a series of key problems brought by high-speed train movement to railway broadband wireless communication system are introduced. The key technology of LTE high-speed rail network is proposed. Finally, a switching algorithm based on train running direction and speed is proposed. And through Matlab simulation and analysis. This paper mainly studies the switching algorithm of LTE in high-speed railway environment, analyzes and optimizes the measurement parameters, filter parameters and control parameters involved in the switching process, and puts forward a switching algorithm suitable for high-speed railway environment. The simulation results show that the improved handoff algorithm can better adapt to the high-speed rail environment, increase the success rate of handover, effectively prevent ping-pong handoff and wireless link connection failure, and provide security for high-speed rail. Reliable broadband wireless communication.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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