郭兴海 彭程 吴睿涵

【摘要】    铁路5G专网是目前铁路通信系统的重要工程。现采用射线跟踪仿真方法，以丰台西站货场为研究场景。确定了场景RSRP和SINR标准，制定了使发射总功率最小的规划目标。通过链路预算规划场景天线数目，提出了快速计算场景RSRP情况的方法，建立了基于重叠复杂度的模型评价场景SINR情况的模型，从而提出天线角度规划方法，筛选出10组最优天线角度组合。之后采用了模拟退火算法求出各角度组合下满足RSRP和SINR标准的发射功率，选取各组中总发射功率最低者作为最终方案。现提出针对天线数目、天线角度和发射功率的一系列规划和优化方法，在保证达到标准的情况下兼顾了计算的高效性，有利于铁路5G专网的快速部署。

【关键词】    铁路5G专网   射线跟踪    天线数目    天线角度    发射功率

Coverage Planning Method of 5G Private Network in Marshalling Station Scene Based on Ray-tracing Technology

Xinghai GUO1，Cheng PENG1，Ruihan WU1

（1. School of Electronic and Information Engineering， Beijing Jiaotong University， Beijing 100044）

Abstract：Railway 5G private network is an important project of railway communication system. In this paper， the ray-tracing simulation method is adopted， and the freight yard of Fengtai West Railway Station is taken as the research scene. The RSRP and SINR standards of the scene are determined， and the planning goal of minimizing the total transmitting power is formulated. By planning the number of antennas in the scene through the link budget， a fast method to calculate the scene RSRP situation is proposed， and a model to evaluate the scene SINR situation based on the model of overlap complexity is established. The antenna angle planning method is proposed， and 10 groups of optimal antenna angle combinations are screened out. Then the simulated annealing algorithm was used to calculate the transmitting power satisfying the RSRP and SINR standards in each Angle combination， and the one with the lowest total transmitting power in each group was selected as the final scheme. In this paper， a series of planning and optimization methods for antenna number， antenna Angle and transmission power are proposed， which can guarantee the high efficiency of calculation while meeting the standards， which is conducive to the rapid deployment of 5G railway network.

Keywords：5G railway private network; ray-tracing; number of antennas; antenna angle; transmitting power;

引言

目前的GSM-R系統可以实现对列车的调度、监控及管理，也可以满足旅客的简单通信要求。但随着智能调度以及视频监控等列车安全辅助系统的应用，现有的技术已经无法满足高速数据传输要求[1]。5G铁路专网是在5G系统平台上增加了铁路运输专用调度通信功能，可以更好地应用于铁路运输，并满足下一代铁路移动通信系统的功能及需求[2]。5G网络对新一代铁路的安全控制、调度管理起着至关重要的作用[3]。传统的规划和优化方法多基于既有经验结合场景来设定基站站址和天线工参，并使用低速轨道车或人工测量获取场景覆盖场强，发现问题后进行优化。……