改进5G-R自适应高速铁路越区切换算法  

An improved 5G-R adaptive high-speed railway handover algorithm

作　　者：陈永[1] 康婕 陶瑄 CHEN Yong;KANG Jie;TAO Xuan(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,兰州730070

出　　处：《北京航空航天大学学报》2025年第3期724-731,共8页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(62462043,61963023);兰州交通大学重点研发项目(ZDYF2304)。

摘　　要：在高速行车条件下,越区切换作为未来高速铁路5G-R通信的关键技术,对于保障行车安全至关重要。下一代高速铁路5G-R无线通信系统越区切换算法采用固定切换参数,但当列车高速运行时,极易受到多普勒效应影响,导致切换成功率低,基于此,提出了一种考虑多普勒频移影响的改进5G-R自适应高速铁路越区切换算法。分析多普勒频移对切换成功率的影响,得到多普勒频移与切换成功率的关系函数;提出考虑多普勒频移影响的越区切换动态函数,设计余弦、余切、余割3种函数对切换迟滞门限及触发时延自适应调整;在不同多普勒频移及不同高铁场景下进行切换成功率的量化比较分析。研究结果表明:所提算法可有效调高切换成功率,在高架桥和山区场景下,余弦、余切、余割3种函数的切换成功率均优于对比算法,且满足中国无线通信系统切换成功率服务质量(QoS)大于99.5%的要求。研究结果为下一代高速铁路5G-R无线通信系统演进提供了理论参考依据。Under high-speed driving conditions,over-area handover,as a key technology for future 5G-R communication of high-speed railways,is crucial for ensuring driving safety.The next-generation 5G-R wireless communication system of high-speed railways adopts fixed handover parameters,but when the train is running at high speed,it is highly susceptible to the Doppler effect,resulting in low handover success.To address this issue,an improved 5G-R adaptive high-speed railway handover algorithm that took into account the influence of the Doppler shift was proposed.First,the influence of the Doppler shift on the handover success rate was analyzed,and the relationship function between Doppler shift and handover success rate was obtained.Then,the dynamic function of handover over the area considering the influence of Doppler shift was proposed,and three functions,namely cosine,cotangent,and cosecant,were designed to adjust the handover hysteresis threshold and time-to-trigger adaptively.Finally,a quantitative comparison analysis of the handover success rate was carried out for different Doppler shift sizes and different high-speed railway scenarios.The results show that the proposed method can effectively improve the handover success rate over the area,and the handover success rate of the cosine,cosecant,and cosecant functions in the viaduct and mountain areas is better than the comparison algorithm and meets the requirement of quality of service(QoS)higher than 99.5%for the handover success rate of China’s wireless communication system.The research results provide a certain theoretical reference for the evolution of the 5G-R system for next-generation highspeed railways.

关 键 词：越区切换算法 5G-R 多普勒频移 动态函数 自适应切换 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TP391.9[自动化与计算机技术—计算机科学与技术]