中文摘要：

对现有及未来移动通信系统在高速铁路中应用出现的主要问题进行了分析，主要包括如车体损耗、小区切换、多普勒频移等。归纳总结了目前国内第三代移动通信（3G）三大主流技术的现有解决方案。在此基础上分析了未来分时长期演进（TD．LTE）移动通信在高铁场景下应用的先进性及其面临的技术难题。重点对解决该问题的国内外相关现有研究成果进行了分析评述，并针对现有研究存在的问题提出了下一步的研究方向。

英文摘要：

This paper analyzed main problems appeared in 3G and future TD-LTE mobile communication systems for high- speed railway, such as the penetration loss, handoff, Doppler shifts, etc. Firstly, it summarized the existing solutions of 3G operators and manufacturers. After that, it pointed out the advancements and the new challenge of TD-LTE over high speed railway environments. Then, it mainly reviewed relevant researches on how to undertake the challenge. Finally, it discussed and prospected the following research problems.