机载时间敏感网络流量调度算法性能研究

Research on Performance of Airborne Time Sensitive Network Traffic Scheduling Algorithm

时间敏感网络是由IEEE802.1工作组开发的一套确定性实时通信的协议标准,定义了以太网传输的时间敏感机制,适用于机载安全关键系统网络通信;流量调度机制可以有效保证机载时间敏感网络实时可靠通信,时间感知整形器和帧抢占是典型的TSN流量调度算法,目前还没有针对机载业务的传输需求进行性能评估;通过分析TSN系统架构及调度算法的核心特性,基于机载网络拓扑,提出一个机载时间敏感网络的数据流传输时延模型,并进行了数学推导,使用离散仿真工具构建TSN网络仿真平台,对3种典型网络流量调度算法进行验证,得到了流量传输时延性能的上界值,分析了流特性参数对调度算法选择的影响;最后,对机载应用流量调度算法的选择进行了总结。

Time-sensitive network is a set of protocol standards for deterministic real-time communication developed by the IEEE802.1 working group,which defines the time-sensitive mechanism of the Ethernet transmission and is suitable for the network communication of airborne safety-critical systems;The traffic scheduling mechanism can effectively ensure the real-time and reliable communication of the airborne time-sensitive network,the time-aware shaper and frame preemption are typical traffic scheduling algorithms of the time sensitive network(TSN).Currently,there is no performance evaluation for the transmission requirements of airborne services on the TSN.By analyzing the system architecture of the TSN and key characteristics of the scheduling algorithm based on the airborne network topology,a transmission delay model of the airborne time-sensitive network is proposed,and the mathematical derivation is carried out.The discrete simulation tool is used to build a network simulation platform,and three typical network traffic scheduling algorithms are verified.The upper bound value of traffic transmission delay is calculated,and the influence of stream characteristic parameters on the selection of scheduling algorithm is analyzed.Finally,the selection of traffic scheduling algorithm in airborne scenarios is summarized.