CBTC Train to Ground Communication Optimization Based on Modified Powell Direction Acceleration Algorithm
YANG Qian1,2, SU Hongsheng1, YANG Jiangang3, LIU Dawei2, DONG Yu1,2
Author information+
1. Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China; 2. Lanzhou Institute of Technology, Lanzhou, Gansu 730050, China; 3. CRSC Research & Design Institute Group Co. Ltd, Beijing 100070, China
Research purposes: Aiming at the problems of instantaneous communication interruption caused by high time delay and insufficient system capacity influenced in the process of train-to-ground(T2G) communication in CBTC system, this paper analyzes affecting factors, proposes an optimization scheme for T2G communication performance in CBTC system, and verifies its effectiveness through modeling and simulation. According to the characteristics of time-varying channel incomplete channel state information in CBTC system, the probability of receiving signal-to-noise ratio lower than proposed threshold, outage probability, is used as evaluation index of T2G communication performance, and a mathematical model is established to express its relationship with decision variables such as the location of trackside access points, small-scale channel decay and train position. The modified Powell direction acceleration algorithm is used to perform iterative optimization on solution of the objective function, and global optimal solution is obtained. Research conclusions: (1) Reducing train speed, reducing T2G information transmission rate and improving communication channel environment can reduce T2G communication outage probability, but seeking the optimal arrangement of trackside access points is the best scheme to improve T2G communication performance in CBTC system, and cost is the lowest. (2) Compared with random search, the modified Powell direction acceleration algorithm used to solve the unconstrained optimization problem in the model shows high efficiency, and the convergence rate is more than 80% faster than random search. (3) The research results can provide theoretical guidance for improving T2G communication performance of CBTC system by optimizing outage probability, and provide a solution for the problem of trackside access point setting in urban rail construction.
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CBTC Train to Ground Communication Optimization Based on Modified Powell Direction Acceleration Algorithm[J]. Journal of Railway Engineering Society, 2025, 42(1): 95-100
[1] 黄佳强. 中低运量轨道交通LTE专网带宽需求研究[J].铁道工程学报, 2020(5): 99-105. Huang Jiaqiang.Research on the Bandwidth Demand of LTE Special Network for Medium and Low Speed Volume Rail Transit[J].Journal of Railway Engineering Society, 2020(5): 99-105. [2] 赵军辉, 陈垚, 张青苗. 基于深度强化学习的车车通信智能频谱共享[J].铁道科学与工程学报, 2022(3): 841-848. Zhao Junhui, Chen Yao, Zhang Qingmiao.Intelligent Spectrum Sharing for Train-to-train Communication Based on Deep Reinforcement Learning[J].Journal of Railway Science and Engineering, 2022(3): 841-848. [3] 韩江磊, 陈永刚. 基于随机网络演算的CBTC车-地无线通信时延分析[J].铁道标准设计, 2019(2): 166-171. Han Jianglei, Chen Yonggang.Analysis of CBTC Vehicle-to-round Wireless Communication Delay Based on Stochastic Network Calculus[J].Railway Standard Design, 2019(2): 166-171. [4] SIMON M K, ALOUNINI M S.Digital Communication over Fading Channels[M].Hoboken NJ: John Wiley & Sons, 2005. [5] 缪海烊. 轨道交通车站场景毫米波无线信道特性研究与应用[D].北京: 北京交通大学, 2021. Miu Haiyang.Researches and Applications of Millimeter Wave Wireless Channel Characteristics in Rail Traffic Station Scenarios[D].Beijing: Beijing Jiaotong University, 2021. [6] 梁雪松. 无线中继通信系统可达速率及中断概率理论分析[D].南京: 东南大学, 2013. Liang Xuesong.Theoretical Analysis of Achievable Rate and Outage Probability for Wireless Relay System[D].Nanjing: Southeast University, 2013. [7] 赵小军, 徐华伟, 刘小娜, 等.基于PSO-Powell混合算法的软磁复合材料二维矢量磁滞特性模拟[J].电工技术学报, 2021(14): 2893-2903. Zhao Xiaojun, Xu Huawei, Liu Xiaona, etc. Two-Dimensional Vector Hysteresis Simulation of Soft Magnetic Composite Materials Based on the Hybrid Algorithm of PSO-Powell[J].Transactions of China Electrotechnical Society, 2021(14): 2893-2903. [8] 李茂青, 郑锋贺, 高云波, 等. 城轨列车对列车通信的多天线Rake接收技术研究[J].铁道标准设计, 2022(10): 149-155. Li Maoqing, Zheng Fenghe, Gao Yunbo, etc. Research on Multi-antenna Rake Receiving Technology for Train to Train Communication in Urban Rail Transit System[J].Railway Standard Design, 2022(10): 149-155.
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