| With the rapid development of aerospace technology and the emergence of new application scenarios,the industry is developing in a more flexible direction,in order to provide low-latency,high-reliability,low-packet loss transmission services,the adaptability of time-sensitive networks in satellite communication research is crucial.This paper focuses on the key technologies of cross-domain converged transmission of time-sensitive services in inter-satellite wireless networks and intra-satellite wired networks,and the research work is mainly divided into two aspects: the flow scheduling method of inter-satellite wireless wired convergence and the inter-satellite deterministic queue forwarding mechanism.Firstly,this paper studies the conflict-free co-network transmission problem of intersatellite cross-domain traffic and intra-satellite same-domain traffic,and considers the large difference in transmission rate between inter-satellite wireless links and intrasatellite wired links and the inconsistent time slot relationship between different domains,and gives a converged network architecture model and cross-domain time slot negotiation mechanism based on converged bridges and TSN switches.Then,on this basis,a linear integer programming model is established for the unified scheduling problem of interdomain traffic,and the constraints that need to be met in this scenario are given,and finally the cross-domain time slot mapping table is generated by the cross-domain time slot negotiation algorithm,and the time slot injection planning problem of the stream is solved by the genetic algorithm.The simulation results show that the algorithm designed in this paper can maximize the number of successfully scheduled streams while satisfying various constraints such as deadline time and queue resources,and has better performance improvement than other algorithms.Then,aiming at the periodic dynamic change of satellite link distance,the unexpected arrival of cross-domain traffic caused by satellite perturbation,clock jitter and other non-ideal factors,as well as the accompanying traffic burst and time slot resource overflow,this paper proposes a queue forwarding mechanism based on the combination of time slot capacity awareness and delay tolerance,and assigns a reasonable forwarding scheme for data frames that deviate from the expected plan by sensing the remaining capacity of the current time slot and combining the delay tolerance of the stream on the basis of the improved queue model and inbound and outbound rules.The simulation results show that the queue forwarding mechanism proposed in this paper can better balance the constraint between slot resources and delay requirements,minimize the probability of traffic conflicts and packet loss while ensuring deterministic delay,and improve the utilization rate of slot resources. |
