一种基于强化学习的铁路通信基站天线覆盖自优化方法  

A Self-optimizing Method for Antenna Coverage of Railway Communication Base Station Based on Reinforcement Learning

作　　者：张志国 ZHANG Zhi-guo(China Energy Shuohuang Railway Development Co.,Ltd.,Suning 062350,China)

机构地区：[1]国能朔黄铁路发展有限责任公司,河北肃宁062350

出　　处：《计算机与现代化》2023年第7期69-72,85,共5页Computer and Modernization

基　　金：国家重点研发计划项目(K20B5100010)。

摘　　要：在LTE-R网络中,基站天线下倾角是影响网络覆盖的主要因素,调整天线下倾角可以有效提高覆盖小区接收终端的信号接收质量。针对3GPP项目中提出的网络覆盖自优化问题,提出一种基于强化学习算法的基站天线下倾角优化方法。首先,借助基站天线电磁波辐射模型,建立以天线发射增益为目标函数的通信网络覆盖优化模型;然后,基于强化学习算法,将覆盖优化问题转化为强化学习中的最大收益问题,在基站天线下倾角可调整空间中获得最优调整角度值,实现移动网络覆盖自优化;最后,利用终端设备接收到的RSRP性能数据进行仿真并在试验段现场实验,验证该方法的有效性。通过实验对比分析,基于强化学习算法的优化方法较未优化前网络覆盖率提升了4.11个百分点,较粒子群优化方法提升了3.59个百分点。本文方法适用于LTE-R专用网络覆盖的基站天线倾角自优化。In LTE-R(Long Term Evolution for Railway)communication network,one major factor influencing the coverage is re⁃lated to the antenna tilt angle.By adjusting antenna tilt,signal reception of user terminal within a cell can be effectively im⁃proved.To solve the coverage optimization problem of Self-Organizing Network(SON)proposed in the 3rd Generation on Part⁃nership Project(3GPP),a method using reinforcement learning algorithm for optimizing the title angle of base station antenna is proposed.Firstly,with the help of the electromagnetic radiation model of the base station antenna,we build a signal coverage op⁃timization model that takes the antenna transmission gain as the objective function.Secondly,we transform the coverage optimiza⁃tion problem into the maximum benefit problem by employing reinforcement learning algorithm,and then accomplish the cover⁃age self-optimization of mobile terminal by finding the best angle value in the range space of the antenna tilt angle.Finally,we have carried out simulation and field verification.The results show that the solution increased 4.11 percentage points compared to no an⁃tenna tilt optimization,and increased 3.59 percentage points compared to the method based on the particle swarm algorithm.The proposed method is suitable for the self-optimization of base station antenna tilt angle covered by LTE-R communication network.

关 键 词：下一代铁路通信网络 网络优化 网络覆盖 强化学习 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]