民机机内 5G 无线混合组网架构性能评估

Avionics Full-Duplex switched ethernet（AFDX）is a mature airborne networking technology for civil aircraft，and has been applied in large passenger aircraft such as Airbus A380. With the increasingly complex functions of civil aircraft avionics system，the complex cross-linking relationship between aircraft equipment has brought new challenges to the networking and deployment of wired network and caused the problems such as SWaP，which further limited the development of traditional wired network. 5G and a series of wireless communication technologies have become a new trend to solve the above problems. Considering the strong real-timeliness and high reliability of airborne network，it is necessary to investigate the airborne hybrid network with 5G wireless access without degradation of performance. In this paper，we propose a network topology architecture for in-flight wireless-wireline hybrid network based on 5G，and implement a traffic wireless access design. Based on this architecture，a traffic end-to-end delay analysis model of in-flight 5G wireless hybrid network is established by using the Chernoff boundary theorem and stochastic network cal⁃ culus. Referring to the A380 network topology，a simulation topology for large-scale airborne network is constructed，and the message transmission delay under the condition of wireless wired hybrid network is numerically simulated and analyzed. The results show that compared to the original AFDX wired network，the5G wireless hybrid network access can be achieved on the basis of an average network delay reduction of 5%.