5G移动通信在智能铁路中的方案分析

面对铁路智能化和未来演进,现有的移动通信技术不能满足智能铁路大容量数据传输,铁路亟需新一代移动通信支撑。5G技术可全面推进铁路通信技术换代升级,但对于数量庞大、高速移动用户,时速350 km上行多普勒频偏高于2 kHz,如不能有效预估并补偿,系统解调性能会严重恶化。针对5G移动通信在智能铁路的应用中面临的问题,分析其业务指标;提出了智能铁路5G移动通信整体架构;并对区间、隧道、室内覆盖组网进行了规划,描述了多普勒频偏原理并给出了频偏补偿方法,这可为实现智能铁路提供技术支持。

Scheme Analysis of 5G Mobile Communication in Intelligent Railway

In the face of railway intellectualization and future evolution,the existing mobile communication technology cannot meet the large capacity data transmission of intelligent railway,and the railway needs the support of new generation of mobile communication.5G technology can comprehensively promote the upgrading of railway communication technology.However,for a large number of high-speed mobile users,the uplinking Doppler frequency offset at a speed of 350 km/h is higher than 2 kHz.If the system cannot be effectively estimated and compensated,the demodulation performance of the system will deteriorate seriously.In view of the problems faced by 5G mobile communication in the application of intelligent railway,its KPI(Key Performance Indicators) are analyzed.The overall architecture of 5G mobile communication for intelligent railway is proposed,and the network of interval,tunnel and indoor coverage is planned.A brief explanation of some of the relevant concepts in Doppler shift and offset compensation method is presented,which provides technical support for the realization of intelligent railway.