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研究了航空电子全双工交换式以太网(AFDX,Avionics Full Duplex SwitchedEthernet)交换机分组调度方法的实时性能,采用实时通信中的周期性任务模型,依据AFDX协议“确定性网络”中关于交换机支持双优先级消息调度原则,推导出了相应的交换机关键参数的数学表达,提出了强实时约束下基于双优先级调度的负载匹配的分组调度方法(DP-LM,Du-al Priority-Load Match),比较了单/双优先级分组调度的不同(消息调度、关键参数和匹配方法),算例结果表明:由于低优先级消息的引入将会对高优先级消息的实时传输产生重要影响.
The real-time performance of Avionics Full Duplex Switched Ethernet (AFDX) switch scheduling method is studied. The periodic task model in real-time communication is adopted. According to the AFDX protocol, “deterministic network” Supports the principle of double-priority message scheduling, deduces the mathematical expression of the key parameters of the switch, and proposes a packet scheduling method based on dual-priority scheduling under strong real-time constraints (DP-LM, Du-al Priority-Load Match ). The differences between single / dual-priority packet scheduling (message scheduling, key parameters and matching methods) are compared. The results show that the introduction of low-priority messages will have a significant impact on the real-time transmission of high priority messages.