| Citation: | CHEN Y，KANG J，TAO X. An improved 5G-R adaptive high-speed railway handover algorithm[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（3）：724-731 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0148
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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 high-speed railways.
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