基于短帧优先调度的AFDX端系统发送策略

摘要

Based on the format research on the AFDX protocol and the current existing end system commonly used data scheduling method,puts forward the scheduling strategy,this strategy makes full use of its own virtual link features of the AFDX protocol and short frame is preferred to send, reduces delay upper bound of part of the link the and waiting time as well as improve network utilization. By using network calculus theory to the short frame prior scheduling strategy to construct the model and get the different virtual link delay upper bound,then do some simulation about the packets sending of the system, the simulation results show that the scheduling strategy reduce the end- to- end delay,and can be a prior strategy in the use of Aircraft Data Network.%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.