Research on Flow Scheduling of Wired and Wireless Converged Satellite Time Sensitive Network

With the increasing complexity of space communication tasks, especially the increasing demand for time sensitivity, on the one hand, the performances of high bandwidth, high reliability and real time in intra satellite systems are required; on the other hand, low latency and high reliability are demanded for inter satellite wireless links. However, due to the large difference between the satellite internal wired link and the inter-satellite wireless link, when the data is transmitted from the wired link to wireless link, it is easy to cause congestion problem on node, and can not guarantee the bounded latency for time-sensitive service. To improve the real time performance for data transmission in space information network, a flow scheduling scheme in wired and wireless converged Time-Sensitive Network (TSN) is proposed. Firstly, the relationship between terminal delay requirement and wired/wireless link resources is analyzed. Then, the time-sensitive requirements of terminals are collected by TSN controller and the optimization goal is determined by the end-to-end minimum average delay of time-sensitive flow in the entire network. Moreover, the enhanced elite retention genetic algorithm is adopted to solve quickly the scheme. Finally, the performance of proposed time slot allocation algorithm is verified through Pycharm. Meanwhile, a low- orbit satellite network scenario is implemented under EXata network simulation platform to evaluate the proposed scheme in the further. The results demonstrate that the proposed wired and wireless joint stream scheduling scheme can provide bounded and stable delay for space time-sensitive tasks.