基于车载数据库协同触发的高铁LTE-R切换算法

Vehicle-Mounted Database Based Switching Algorithm by Using Cooperative Trigger Mechanism for LTE-R of High-Speed Train

进一步提升高铁的信道切换性能具有重要的现实意义.基于信号功率和车载数据库协同触发机制提出了应用于高速铁路下一代通信专网LTE-R(long term evolution for railway)的新型切换算法,将数据库基站信息和信号功率实测信息的比对结果作为切换触发的判据,能实现中断快速重连和切换锁定等功能.仿真结果表明,该新型切换算法能有效提升LTE-R的信道切换性能,在重叠区关键位置点的触发效率比传统算法提升43.7%,切换成功率达到了99.5%.该协同触发切换算法在LTE-R高铁通信专网上具有广阔的应用前景.

It is of significant importance to further improve the channel switching performances of high-speed railway. In this paper, a new long term evolution for railway （LTE-R） switch algorithm for high-speed train is proposed based on the vehicle-mounted database and the signal power measurement. The comparison result between the information of eNodeB stations （BS） along the railway and the real-time measurement is used for switching trigger judgment of database. The simulation result shows that the proposed algorithm can achieve the fast reconnection after interruption and switch locking. The switching trigger efficiency ratio of the proposed algorithm is 43.7% higher than that of the conventional algorithm on several key points of overlap region. And the handover success rate reaches as high as 0.995. The cooperative triggering algorithm is promising for extensive applications in the high-speed railway network LTE-R.