重载铁路LTE网络应急处置策略研究

Research on Emergency Response Strategy of LTE Network for Heavy-haul Railway

重载铁路LTE网络主要承载重载列车机车同步操控(列控)、调度通信、调度命令等业务,对无线网络可靠性、时延性和稳定性等要求较高。若无线网络发生故障,将直接影响重载列车的行车安全,故障恢复时长亦影响重载铁路的运行效率。为及时处置网络故障,保障列车安全运行,重点对LTE网络应急处置策略进行研究。首先,依据重载铁路LTE网络线性组网应用模型,分析平原、山区等不同场景网络的覆盖特点。然后,对受LTE网络影响较大的无线侧所涉及的基站设备、天馈及漏缆等主要故障类型进行深入分析,通过研究不同故障类型对LTE网络承载能力、网络有效覆盖范围、网络信号质量等的影响,利用无线场强GIS仿真、覆盖范围冗余计算、软参特性分析等方法,在保证故障应急处置效率EoEH的前提下,针对性提出架设模块化基站、设置级联RRU、调整相邻基站天馈参数、调整相邻小区软参等应急处置策略。最后,给出应急处置效果评估方法。通过朔黄重载铁路实际应用,验证所提策略对网络故障快速恢复切实有效,并有助于提高LTE-R网络的可靠性和稳定性。

The main services carried by the heavy-haul railway LTE network have high requirements on the reliability,delay,and stability of the wireless network.Once the wireless network fails,it must be restored accurately and quickly to ensure the safe operation of the train.First,according to the linear networking application model of heavy-haul railway LTE network,this paper explains the network coverage characteristics of different scenarios in plain areas,mountain tunnels,etc.,and analyzes the main fault types such as base station equipment,antenna feeders and leaky cables.Then,for different types of failures,strategies such as setting up modular base stations,setting cascaded RRUs,adjusting the antenna feeder parameters of adjacent base stations,and adjusting the software parameters of adjacent cells are proposed.Finally,the evaluation method of emergency response effect is given.Through the actual application of Shuohuang heavy-haul railway,the strategy proposed in this paper is effective for rapid recovery of network failures,and helps to improve the reliability and stability of LTE-R network applications.