高速铁路车-地同步定位预测快速越区切换方法  

Vehicle-ground Position Sync-prediction Handover for High-speed Railways

作　　者：杨春勇[1] 胡雯萱[1] 石珊[1] 

机构地区：[1]中南民族大学智能无线通信湖北省重点实验室,湖北武汉430074

出　　处：《铁道学报》2014年第5期53-57,共5页Journal of the China Railway Society

基　　金：国家自然科学基金(61002013)

摘　　要：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。Bandwidth insufficiency and frequent handover are the key problems for high-speed railways to develop broadband wireless communication at present.In this paper,the opto-electronic joint fast handover mechanism 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,packeting delay and package losses to a great extent effectively overcome the shortage of long handover time and avoid the situation of handover-intensive.

关 键 词：高速铁路 小区移动 同步预测 切换时间 

分 类 号：U285.5[交通运输工程—交通信息工程及控制]