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在高速铁路场景下,列车时速最高可达到350 km/h,留给扇区间切换的时间很短。通过对普速、高速、高铁三种场景下码分多址(CDMA)系统切换时长进行比较研究,得出:软切换、更软切换时长随着移动台移动速度的增加有所变长;切换加比切换去所用的切换时长要长;从软切换和更软切换时长的分析来看,建议采用400 ms作为软切换时长的参考值,而350 ms作为更软切换时长的参考值。最后,提出高铁场景下小区重叠覆盖区域大小的建议。
In the high-speed railway scenario, the train speed can reach up to 350 km / h, leaving a very short time to switch between sectors. By comparing the switching duration of code division multiple access (CDMA) systems in three kinds of scenes, that is, general speed, high speed and high speed rail, it is concluded that soft handoff and longer soft handoff length become longer as the moving speed of mobile station increases. It takes 400 ms as the reference for the soft handoff duration and 350 ms as the reference for the softer handoff duration from the analysis of soft handoff and softer handoff duration. Finally, the author proposes the size of the overlapping area of the area under the HSR scenario.