Bandwidth insufficiency and frequent handover are the key problems for high-speed railways to devel-op broadband wireless communication at present.In this paper,the opto-electronic j oint fast handover mecha-nism was constructed on the basis of the Radio over Fiber (RoF)network and the novel concept of Cell Moving so as to support high-bandwidth and shorten handover time in high-speed train mobile communication.And then,the new abroad-vehicle & wayside positioning sync-prediction algorithm was brought forth to match the mechanism.Results of network simulation with NS-2 show that compared with the classific IEEE802.11 the synchronization position prediction handover algorithm can better the indexes of the network throughput,pack-eting delay and package losses to a great extent effectively overcome the shortage of long handover time and a-void the situation of handover-intensive.%带宽不足和切换频繁是高速铁路现阶段发展宽带移动通信所面临的关键问题。本文基于光载无线电新技术和小区移动的新概念，构建一种可支持高带宽高铁移动通信应用场景的光电联合控制快速越区切换机制，并提出一种与该机制相匹配的车-地同步定位预测越区切换方法。通过在网络仿真软件 NS-2下建立高铁通信模型，获得的仿真结果表明，车-地同步定位预测越区切换算法与经典的 IEEE 802.11切换算法相比，在网络吞吐量、封包延迟以及丢包率等指标上均有较大幅度的性能提升，有效克服切换时长问题，避免出现严重的切换风暴。
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