目前国际铁路联盟建议将GSM-R直接演进到LTE-R，在高铁场景中，LTE-R将面临无线信号衰减严重、多普勒频移和越区切换频繁等难点。因此项目将研究面向高铁的LTE-R的接入架构及其物理层关键技术，优化接入和越区切换策略，以保障LTE-R承载业务的可靠接入。利用高铁基站沿铁路线带状分布的特点，研究多普勒频偏所引起的子载波干扰自消除技术，改善LTE-R无线传输性能。在移动中继环境下，研究基于多天线双向中继协同技术，提升LTE-R无线传输容量。在应急条件下，研究D2D技术，完善LTE-R信息传输安全保障。项目的研究对推动GSM-R向LTE-R的演进具有学术价值和现实意义，可以为我国高铁发展提供一定的技术支撑。

At present, the UIC (International Union of Railways) has suggested using LTE-R (Long Term Evolution for Railway) instead of GSM-R (GSM for Railway) directly. In the scenario of high speed railway, LTE-R will be faced with various difficulties (e.g., serious attenuation of radio wave, Doppler Shift and frequent handoff). Therefore, this project will be focused on the access architecture and key technologies in the physical layer of LTE-R for high speed railway. The access network and handover schemes will be optimized to ensure the reliability of LTE-R service. Utilizing the distribution of railway, ICI (intercarrier interference) caused by Doppler Shift will be studied to improve the throughput of LTE-R system. Cooperative relay technology combined with MIMO (Multiple-Input Multiple-Output) will improve the system capacity of LTE-R in the mobile relay environment. In the emergency scenario, the D2D (Device-to-Device) technology will be investigated to secure the information transformation of LTE-R system. The research will motivate the network from GSM-R to LTE-R in both the academic and practical aspects. Meanwhile, it can provide certain technical support for the high speed railway development of our country.