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高速移动的无线节点在接入点间切换时,切换延迟较大、丢包率较高.在单网卡切换环境中,不可避免地存在网络中断的现象.该文结合地铁无线通信环境对切换延迟和丢包问题进行研究,为移动节点配备两块无线网卡,控制两块网卡协同工作,共同完成无线切换和数据传输.测试结果表明,双网卡软切换机制无需修改网络层及上层协议栈,在特定环境中可以实现低延迟和零丢包.该切换机制已经在地铁信号系统国产化预研项目中得到应用.
High speed mobile wireless nodes switch between access points, the switching delay larger, higher packet loss.In a single network adapter switching environment, there is inevitably a network interruption.This paper combines subway wireless communication environment for switching delay And packet loss problem, the mobile node is equipped with two wireless network cards, control two network cards to work together to complete the wireless switch and data transmission.The test results show that the double network card soft switching mechanism without modifying the network layer and the upper protocol stack in Low delay and zero packet loss can be achieved in a specific environment.The switching mechanism has been applied in the pre-research project of localization of subway signaling system.