基于OpenFlow的AFDX网络虚拟链路动态优先级接纳控制

Dynamic Priority Admission Control of Virtual Link in AFDX Based on OpenFlow

为了在航空电子全双工交换式以太网(AFDX)中更加灵活地对虚拟链路(VL)实行接纳控制,将OpenFlow引入AFDX网络中,建立了相应的网络模型、消息模型和流量模型。利用网络演算方法分析了优先级VL在基于OpenFlow的AFDX网络中的端到端延迟上界,结合粒子群优化算法,提出了动态优先级接纳控制算法。理论分析结果表明:与动态非优先级接纳控制方法和传统静态优先级分配方法相比,本算法的消息延迟分别降低了49.2%和26.4%,并且本算法能够更加灵活地对VL实行接纳控制,提高网络资源的利用率。最后通过仿真对理论分析的结果进行了验证。本算法为提高接纳控制方法的性能提供了参考,增强了AFDX网络的通信效率与实时性能。

To design a more flexible admission control of virtual link （VL） in avionics full duplex switched Ethernet （AFDX）,OpenFlow is introduced to AFDX,and the corresponding models are built including network model,message model and traffic model.The end-to-end delay bounds of priority VL in AFDX based on OpenFlow are analyzed with the help of the network calculus theory.Combining the particle swarm optimization,the dynamic priority admission control algorithm is proposed.The analytical results show that compared with the dynamic non-priority admission control method and the traditional static priority assignment method,the end-to-end delays of messages using the proposed algorithm are reduced by 49.2％ and 26.4 ％.And the proposed algorithm can improve the utilization of the network resources by providing a more flexible admission control of VL.In the end,the analytical results are verified by the simulation.The proposed algorithm provides a reference for improving the performance of admission control and enhances the communication efficiency and real-time performance of AFDX.