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通过分析AFDX协议格式以及当前端系统常用数据调度方法,提出了短帧优先调度策略,策略充分利用了AFDX协议虚拟链路特点,优先发送短帧,从而降低了部分链路的延迟上界,有助于减少等待时间,提高网络带宽利用率。应用网络演算理论建立了基于短帧优先调度策略的端系统模型,推导了不同虚拟链路的延迟上界表达式,并进行了与系统数据发送相关的一系列仿真研究,结果表明调度策略降低了端到端系统的发送延迟,是航空数据网络实时传输系统的优选策略。
By analyzing the AFDX protocol format and the data scheduling method commonly used in the current system, a short frame priority scheduling strategy is proposed. The strategy makes full use of the characteristics of the AFDX virtual link and sends short frames first, which reduces the delay upper bound of some links Help reduce the waiting time, improve network bandwidth utilization. Based on the network calculus theory, an end system model based on the short-frame priority scheduling strategy is established. The upper bound of the delay for different virtual links is deduced and a series of simulation studies are carried out. The results show that the scheduling strategy reduces End-to-end system to send the delay, the air data network real-time transmission system, the preferred strategy.