高铁环境下LTE切换技术的研究与应用

发布时间：2018-11-03 12:14

【摘要】：随着社会经济的发展，移动通信已经深入到人们日常工作和生活的每个角落，人们对移动通信的依赖性越来越强，通信质量的要求也越来越高。目前2G、3G通信系统已经能满足人们日常工作和生活的无线通信需求，而在高速运行、客流集中、业务容量高、部署场景复杂的高铁内提供高质量的通信服务，成为高铁通信网建设和发展面临的重大挑战。2010年我国提出发展基于LTE的铁路宽带无线通信系统LTE-R，将OFDM、MIMO等关键技术应用于高铁宽带无线通信，，为铁路运营管理提供安全、可靠、高效的通信系统，为列车上的旅客提供优质的语音、多媒体接入和上网娱乐等服务，提升出行体验。切换技术作为LTE系统的关键技术之一，能有效地保证用户的通信质量。如果切换过早会产生乒乓效应，切换过晚会造成无线链路连接中断，产生掉话现象，因此需要研究适应于高铁环境的快速可靠的切换算法。本文首先介绍了高铁发展的现状和LTE技术的主要性能和优势，描述了LTE的网络架构，对LTE包含的各个网元的功能与作用进行了介绍，其中重点介绍了LTE在组网架构和网元职能上的改进。然后介绍了LTE系统中的4种关键技术，包括OFDM技术、MIMO技术、切换技术和混合自动重传HARQ技术，其中重点介绍了切换技术。接着介绍了列车的高速移动给铁路宽带无线通信系统带来的一系列关键问题，提出了LTE高铁组网关键技术，最后提出一种基于列车运行方向和运行速度进行切换的算法，并通过Matlab进行仿真和分析。本文主要对高铁环境下LTE的切换算法进行研究，对切换过程中涉及到的测量参数、滤波参数和控制参数等进行分析和优化，提出适合高速铁路环境的切换算法，并进行仿真验证，仿真结果表明，改进的切换算法能更好地适应高铁环境，提高切换的成功率，有效地防止乒乓切换和无线链路连接失败，为高铁提供安全、可靠的宽带无线通信。
[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.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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