基于多家乡技术的列车移动网络研究

Research on Multi-homing Based Mobile Networks on Trains

针对在移动列车等公共交通工具上为乘客提供高速无缝的互联网接入服务的问题,本文对列车移动网络的自身特征以及所处无线网络环境进行分析,并建立一种基于多家乡技术的列车移动网络系统。构建具有多种无线外部接口和有线/无线内部接口的移动路由器,通过策略配置和网络状态实时监测,实现在多个不同类型的外部无线接口上进行流量分配和负载均衡的机制。提出一种基于自主选举方式的最佳移动路由器推举方法,通过分布式的协议消息交互推举出最佳移动路由器,保证了多个移动路由器的有效协同工作。仿真试验表明,本文提出的方案能够有效提高列车移动网络的总体可用带宽,降低列车运行所引起的数据传输速率抖动,增强网络连接的稳定性和可靠性。

With regard to providing high-speed seamless Internet services for passengers on moving trains, this paper analyzes the special characters of mobile networks on trains and the wireless environment along the railways and proposes a multi-homing train mobile network system. Mobile routers with multiple wireless outboard interfaces and wire/wireless inboard interfaces are consructured. The technic for implementing stream discribution and load balance at different outboard interfaces is established via tactical configuration and realtime monitoring of the network status. A self-determined scheme for selecting the primary mobile router is designed to ensure that multiple mobile routers can work together effectively. Simulation results indicate that the proposed system can improve the available bandwidths of the mobile networks on trains, decrease the traffic jitters caused by train movement and provide a faster and more stable Internet accessing services for passengers.