【摘要】：隨著社會(huì)經(jīng)濟(jì)的發(fā)展，移動(dòng)通信已經(jīng)深入到人們?nèi)粘９ぷ骱蜕畹拿總�(gè)角落，人們對(duì)移動(dòng)通信的依賴性越來越強(qiáng)，通信質(zhì)量的要求也越來越高。目前2G、3G通信系統(tǒng)已經(jīng)能滿足人們?nèi)粘９ぷ骱蜕畹臒o線通信需求，而在高速運(yùn)行、客流集中、業(yè)務(wù)容量高、部署場(chǎng)景復(fù)雜的高鐵內(nèi)提供高質(zhì)量的通信服務(wù)，成為高鐵通信網(wǎng)建設(shè)和發(fā)展面臨的重大挑戰(zhàn)。2010年我國(guó)提出發(fā)展基于LTE的鐵路寬帶無線通信系統(tǒng)LTE-R，將OFDM、MIMO等關(guān)鍵技術(shù)應(yīng)用于高鐵寬帶無線通信，，為鐵路運(yùn)營(yíng)管理提供安全、可靠、高效的通信系統(tǒng)，為列車上的旅客提供優(yōu)質(zhì)的語音、多媒體接入和上網(wǎng)娛樂等服務(wù)，提升出行體驗(yàn)。 切換技術(shù)作為L(zhǎng)TE系統(tǒng)的關(guān)鍵技術(shù)之一，能有效地保證用戶的通信質(zhì)量。如果切換過早會(huì)產(chǎn)生乒乓效應(yīng)，切換過晚會(huì)造成無線鏈路連接中斷，產(chǎn)生掉話現(xiàn)象，因此需要研究適應(yīng)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(xiàn)狀和LTE技術(shù)的主要性能和優(yōu)勢(shì)，描述了LTE的網(wǎng)絡(luò)架構(gòu)，對(duì)LTE包含的各個(gè)網(wǎng)元的功能與作用進(jìn)行了介紹，其中重點(diǎn)介紹了LTE在組網(wǎng)架構(gòu)和網(wǎng)元職能上的改進(jìn)。然后介紹了LTE系統(tǒng)中的4種關(guān)鍵技術(shù)，包括OFDM技術(shù)、MIMO技術(shù)、切換技術(shù)和混合自動(dòng)重傳HARQ技術(shù)，其中重點(diǎn)介紹了切換技術(shù)。接著介紹了列車的高速移動(dòng)給鐵路寬帶無線通信系統(tǒng)帶來的一系列關(guān)鍵問題，提出了LTE高鐵組網(wǎng)關(guān)鍵技術(shù)，最后提出一種基于列車運(yùn)行方向和運(yùn)行速度進(jìn)行切換的算法，并通過Matlab進(jìn)行仿真和分析。 本文主要對(duì)高鐵環(huán)境下LTE的切換算法進(jìn)行研究，對(duì)切換過程中涉及到的測(cè)量參數(shù)、濾波參數(shù)和控制參數(shù)等進(jìn)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(jìn)行仿真驗(yàn)證，仿真結(jié)果表明，改進(jìn)的切換算法能更好地適應(yīng)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(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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