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航空电子全双工交换式以太网(AFDX)对传输的数据流采用先到先服务(FCFS)调度策略,导致安全关键性数据的网络延迟较大,拥塞情况下的数据流延迟存在不确定性。为解决该问题,提出一种用于优化AFDX网络实时性的混合队列调度策略,综合FCFS调度策略、静态优先级队列调度策略和差额轮询调度策略的优点,通过网络演算分析数据流的延迟上界,理论验证硬实时数据流满足AFDX网络通信需求。仿真实验结果表明,混合队列调度策略不仅可以保证AFDX网络中安全关键性数据流的实时性,以及非安全关键性数据流的调度公平性,而且能有效隔离恶意数据流。
Avionics Full Duplex Switched Ethernet (AFDX) uses a first-come, first-serve (FCFS) scheduling strategy for transmitted data streams, resulting in greater network latency for safety-critical data and data stream delays in congestion scenarios . In order to solve this problem, a hybrid queue scheduling strategy is proposed to optimize the real-time performance of AFDX network. The advantages of FCFS scheduling strategy, static priority queue scheduling strategy and balance round robin scheduling strategy are proposed. The delay of data flow is analyzed by network analysis Realms, Theoretical Validation Hard real-time data streams meet AFDX network communication needs. The simulation results show that the hybrid queue scheduling strategy can not only ensure the real-time security-critical data flow in AFDX networks, but also the fairness of scheduling of non-safety-critical data flows and effectively isolate malicious data flows.