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考虑38GHz毫米波通信中断与信道占用因素,依据磁浮运控系统越区切换流程建立了确定与随机Petri网(DSPN)模型,对单一移动终端(MT)和冗余MT两种结构进行了比较,研究了基站间距和列车运行速度对单一MT和冗余MT两种结构越区切换可靠性的影响。研究结果表明:冗余MT越区切换性能明显优于单一MT,后者的停车概率约为前者的3×104倍;越区切换成功率随列车运行速度的提高而降低,随基站间距的减小而降低;在极端情况下,即列车以500km·h-1运行,且相邻基站间距为500m,冗余MT和单一MT越区切换成功率只有98.50%和97.85%。研究结论为磁浮运控系统车地通信子系统的服务质量优化与移动小区设置提供了依据。
Considering the interruption of 38 GHz millimeter-wave communication and channel occupancy, a model of deterministic and stochastic Petri nets (DSPN) is established according to the handover process of Maglev system. The two structures of single mobile terminal (MT) and redundant MT are compared. The effect of base station spacing and train running speed on the handoff reliability of single MT and redundant MT are studied. The results show that the performance of redundant MT handover is obviously better than single MT, and the latter is about 3 × 104 times more than the single MT. The success rate of handover decreases with the increase of train operating speed, In the extreme case, that is, the train runs at 500km · h-1 and the distance between adjacent base stations is 500m. The successful rates of redundant MT and single MT handover are only 98.50% and 97.85% respectively. The research conclusion provides the basis for optimization of service quality and mobile cell setting of the car-ground communication subsystem of Maglev system.