不同制式LTE技术的高铁场景适应性比较研究

Comparison and Research on the Adaptability of Different Standard LTE Technology under High-speed Railway Scenario

研究目的:目前我国高速铁路在列车速度大于250 km/h时,尚不能正常提供面向乘客的宽带数据业务,主要依靠三大运营商对既有公网2G/3G/4G(LTE)网络补强来提供语音和数据业务服务,本文通过搭建半实物仿真平台,研究在高速铁路移动场景下不同制式LTE技术的适应性,为我国下一步开展铁路宽带无线网络规划和建设提供理论支持。研究结论:(1)两种制式FDD-LTE和TDD-LTE技术在不同高铁环境下均能提供安全、可靠的车地间宽带无线通信,FDD-LTE制式相比TDD-LTE制式网络具有更强的高速适应性;(2)两种FDD-LTE和TDDLTE制式的网络误块率和吞吐量性能与移动速度的变化趋势一致,均是随着速度增大,误块率逐渐增大,吞吐量逐渐下降;在速度超过300 km/h后,TDD-LTE网络相比FDD-LTE网络性能下降明显;在速度超过400 km/h后,两种制式网络性能均有大幅下降;在相同速度条件下,FDD-LTE制式比TDD-LTE制式网络性能更稳定;(3)两种FDD-LTE和TDD-LTE制式的网络误块率和吞吐量性能与覆盖场强的变化趋势一致,随覆盖场强增加,误块率会有一定程度的减小,而吞吐量会有一定程度的提高,特别是在移动速度较高时,提高覆盖场强,性能改善更为明显;(4)本研究成果可以为我国铁路宽带无线网络规划和建设提供依据和参考。

Research purposes： When the high - speed railway＇ s velocity is more than 250 km/h in China at present, it cant normally provide broadband data services of passenger oriented, and it mainly relies on three major operators of existing public 2G/3G/4G （LTE） network reinforcement to provide voice and data services. By setting up the hardware in the loop simulation platform, it was explored about the adaptability of different standard LTE technology under high - speed railway mobile scenarios, to provide theoretical support for future planning and construction of railway broadband wireless network in China. Research conclusions： （ 1 ） FDD - LTE and TDD - LTE technology can provide security and reliability of the train to the broadband wireless communication, FDD - LTE compared with TDD - LTE has more high adaptability. （2） The change trend of FDD - LTE and TDD - LTE standard network block error rate （BLER） and throughput performance is consistent with movement speed. With the increase of the movement speed, the BLER will be increased, the throughput will be reduced ; At a speed of more than 300 kin/h, TDD - LTE network compared with FDD - LTE network performance will decrease more significantly; At a speed of more than 400 kin/h, two standard network performance will significantly decreased ; Under the condition of the same speed, FDD - LTE standard network performance is more stable than TDD - LTE standard. （ 3 ） The change trend of FDD - LTE and TDD - LTE standard network BLER and throughput performance is consistent with field strength coverage. With the increase of the field strength, the BLER will be reduced to a certain extent, and the throughput will be improved to a certain extent. Especially when the moving speed is higher, it is more obvious to improve the performance of coverage. （4）The research results can provide the basis and reference for the planning and construction of China＇s railway broadband wireless network.