高速切换场景下的双门限判决算法研究  

Research on the double-threshold decision algorithm in a high-speed handover scenario

作　　者：孙志国[1] 王程 王震铎 宁晓燕[1] SUN Zhiguo;WANG Cheng;WANG Zhenduo;NING Xiaoyan(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2024年第6期1196-1201,共6页Journal of Harbin Engineering University

基　　金：黑龙江省自然科学基金项目(LH2021F009)。

摘　　要：传统的越区切换算法无法应对高速列车提速带来的通信质量需求增长,本文提出一种基于双门限判决的位置触发切换算法,以提升越区切换时的通信质量。选择大小双门限值,能够有效减少信号强度波动带来的影响。在接收信号强度波动较小时采用双门限中的较小值,波动较大时则采用较大值,针对每次测量结果实时进行连续双判决。仿真结果表明:相较于传统切换算法,双门限判决算法能够使得切换发生位置更靠近基站重叠区域的中点,进而降低切换掉话率和切换失败率。同时双判决减小了平均切换次数,使通信体验得到了极大提升。Traditional handover algorithms cannot cope with the increasing demand for communication quality owing to the increase in high-speed trains.Therefore,a position-triggered handover algorithm based on double-threshold decision is proposed to enhance the communication quality during handovers between different areas.By selecting double-threshold values,it can effectively reduce the impact of signal strength fluctuations.The smaller threshold value will be used when the fluctuation of the received signal strength is small;otherwise,the larger threshold value will be used.Real-time,continuous dual decisions are made for each measurement result.Simulation results reveal that compared with traditional handover algorithms,the double-threshold decision algorithm can make handovers occur near the midpoint of the overlapping area of base stations,thereby reducing the handover drop and failure rate.Moreover,the dual decision reduces the average number of handovers,greatly improving the communication experience.

关 键 词：越区切换 LTE-R 列车通信系统 双门限判决 掉话率 切换失败率 性能仿真 动态检测 

分 类 号：TN929.5[电子电信—通信与信息系统]