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为了提高GSM-R系统的切换成功率,设计了一种共享中继增强型切换机制,利用共享中继改善相邻基站重叠区内来自目标基站的信号质量,明显区分不同基站的信号,减少信号波动导致的切换误判。仿真结果表明:利用增强型切换机制将列车的切换触发地点提前约500 m,从而保证列车在重叠区内具有足够的距离完成切换,并且由于信号质量的改善,减少了乒乓效应,将切换失败概率降低到10-6,提高了切换成功概率。同时,考虑到系统干扰的原因,共享中继不适用于频率复用因子小于2的网络。
In order to improve the handover success rate of GSM-R system, a shared relay enhanced handover mechanism is designed, which uses shared relay to improve the signal quality from the target base station in the overlapping area of adjacent base stations, obviously distinguishes the signals of different base stations and reduces the signal Fluctuation caused by the switching misjudgment. The simulation results show that using the enhanced switching mechanism to switch the train trigger location about 500 m ahead of schedule to ensure the trains have enough distance to complete the handover in the overlapping area and the ping-pong effect is reduced due to the improvement of the signal quality. The switching failure probability Reduced to 10-6, improve the probability of success of the switch. At the same time, considering the reason of system interference, shared relay does not apply to networks with frequency reuse factor <2.