【摘要】 5G-R作为智能铁路的重要组成部分，为铁路基础设施智能监测、智能运维和智能运输等的建设及持续演进提供了大带宽、低时延和广连接的通信支撑。通过分析智能网络10种铁路应用业务通信模型对5G-R在应用业务承载和带宽等方面的需求，结果表明采用TDD制式构建5G-R通信系统在空口标准化和自适应化、网络延展性等方面具有技术优势，能够很好地满足铁路业务对车地通信服务质量的需求类型多、差异性大的特点，以及适应车地通信上下行带宽、速率需求不平衡不对称的特征。试验结果显示：采用TDD制式构建5G-R在频率资源调度方面具有更好的灵活性，在综合提高频谱资源利用效率方面具备独特优势，能够很好地适应350 km运营时速的高速铁路运用场景。更多还原

【Abstract】 As a key part of intelligent railways, 5G-R provides the strong communication capability of large bandwidth,low latency, and wide connection for the construction and development of intelligent monitoring, intelligent maintenance,and intelligent transportation of railway infrastructure. The requirements of 10 communication models of railway application services in an intelligent network for 5G-R were analyzed in terms of application service carrying capacity and bandwidth. The results show that the 5G-R communication system constructed by time division duplex(TDD)standard has technical advantages in air interface standardization and self-adaptation, as well as network scalability,which can well meet the various and different requirements of railway services for train-to-ground communication service quality. In addition, the 5G-R communication system can adapt to the characteristics of the unbalanced and asymmetric up/downlink bandwidth and rate requirements of train-to-ground communication. The experimental results show that the 5G-R system constructed by TDD standard is more flexible in frequency resource scheduling. It has unique advantages in comprehensively improving the utilization efficiency of spectrum resources and can well adapt to the application scenario of high speed railways with an operating speed of 350 km/h.更多还原