基于LSTM动态波束赋形的高速列车越区切换算法  

Handover Algorithm Based on LSTM Dynamic Beamforming for High-speed Train

作　　者：李翠然[1] 张泽鹏 谢健骊[1] LI Cuiran;ZHANG Zepeng;XIE Jianli(School of Electronic and Information Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《铁道学报》2023年第10期78-86,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(62161016);甘肃省科技计划(20JR10RA273);北京市高速铁路宽带移动通信工程技术研究中心(北京交通大学)开放课题基金(BHRC-2022-1)。

摘　　要：高速列车越区切换参数具有较强的时空相关性,以及无线信号在不同线路地形下具有衰落差异性,这都对高性能的越区切换提出了新的挑战,针对这一问题,设计一种基于长短期记忆网络动态波束赋形的高速列车越区切换算法。提出基于LTE-R中继通信模型的高铁典型运行场景中波束无遮挡传输的基站天线高度设置规律,通过估计发射波束主瓣方向并利用参考信号接收功率序列的时间相关特性,提出eNB重叠区内天线波束增益需求预测模型;同时采用增加波束预留角策略实现联合约束条件下的高速列车越区切换。结合高速铁路典型运行场景(路堑、高架桥)的路径损耗预测模型仿真评估了算法性能。结果表明,所提算法以略微牺牲越区切换时延为代价提高了越区切换成功率,能够有效避免高速列车越区切换引起的通信中断问题。In view of the strong spatiotemporal relativity of handover parameters of high-speed trains and the difference of wireless signal fading in different high-speed railway(HSR)terrains,a novel handover algorithm was designed,based on the long short-term memory(LSTM)dynamic beamforming.The roles of eNB antenna height setting were given for the unobstructed beam transmission in typical HSR scenarios,based on the LTE-R relay communication model.A beam gain demand prediction model was proposed for the eNB overlapping area,by estimating the main lobe direction of the transmitted beam and considering the time-correlation in the reference signal receiving power(RSRP)sequence.In addition,a strategy of increasing beam reservation angle was adopted to achieve high-speed train handover procedure under the joint constraints.The algorithm performance was evaluated with the path loss prediction model under typical HSR scenarios(cutting and viaduct).The results show that the proposed algorithm improves the handover success rate at the cost of slightly sacrificing the handover delay,to avoid the communication interruption caused by the high-speed train handover.

关 键 词：高速铁路 波束赋形 长短期记忆网络模型 波束预留角 越区切换 

分 类 号：TN929.5[电子电信—通信与信息系统] U285.2[电子电信—信息与通信工程]