基于交换式以太网的列车通信网络的交换机排队时延分析

传统列车通信网络的带宽难以满足现代列车数据传输的要求.本文提出了一种基于交换式以太网的列车通信网络解决方案,为了降低列车实时数据的传输时延,为交换机设计了具有优先级的队列调度策略,并采用G/D/1排队论分析了列车实时数据和非实时数据的排队时延,计算证实了该策略可以将实时数据在交换机的平均排队时延降低到70 μs以下.最后,通过网络仿真研究证实了实时周期数据的平均排队时延从无优先级时的91 μs降低到了有优先级时的61 μs.

Switch queuing delay of train communication network based on switched Ethernet

Aiming at the problem that the bandwidth of the traditional train communication networkcannot meet the communication needs nowadays, this paper presents an innovative mlution for TCNbased on switched Ethernet. In order to reduce the transmission delay of train real-time data, theswitch is designed with priority queue scheduling algorithm. Then, this paper analyzes differentqueue＇s delay using G/D/1 queuing theory, which confirms the scheduling algorithm can reduce theaverage queuing delay of real-time data in the switch less than 70 μs. Finally, this paper confirms theresults using network simulation that the average queuing delay of real-time data can be reduced to61 μs with priority queue scheduling from 91 μs without the tactic.