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摘要: 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。Abstract: In order to improve the successful handover probability of GSM-R (GSM for railway) system, an enhanced handover scheme with shared-relay stations was put forward. In the scheme, shared-relay stations were applied to improve the signal quality of target base stations in the signal overlapping region among adjacent base stations and to separate the received mixed signals from different base stations, which could decrease the handover misjudgment resulted from signal fluctuation. Simulation result shows that the scheme can trigger handover appropriately in advance about 500 m, so that there is longer distance for completing handover process when train is traversing through the overlapping region. Because of better signal quality, ping-pong effect eliminates, handover failure probability reduces to 10-6, thereby, successful handover probability increases. Meanwhile, considering the system interference, shared-relay stations can not be used in the network with the less reuse factor than 2.2 tabs, 9 figs, 13 refs.
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Table 1. Required distances for train completing handover
Speed/ (km·h-1) Distance/m 200 46 250 58 360 83 500 115 The average handover time-consuming is 0.834 s[5] 
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Table 2. Coverage requirement of GSM-R network
Speed V/ (km·h-1) Coverage power/dBm Coverage rate/% V≤220 -95 95 220 < V≤280 (-95, -92) 95 V > 280 -92 95
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