面向航天器有线无线混合场景的流调度机制研究

随着各国深空探测任务的开展，空间站的建设需求日益增加，而航天器内部大量的数据通信总线在一定程度上影响了航天器的有效载荷。因此，该文将无线通信方式引入到航天器通信系统设计中，但传统无线通信难以保障时敏数据的端到端传输时延，该文提出了一种有线无线融合的时间敏感网络(TSN)流调度方案。设计了一种上下行时隙分离的TDMA时隙分配机制，通过对航天器内部业务类型与有线无线融合传输链路的时延关系进行建模分析，构建了以时敏业务平均端到端时延最小的目标函数，采用粒子群算法对时隙分配方案进行快速求解。最后在Pycharm平台对所提算法进行对比测试，并在EXata网络仿真平台搭建航天传感器采集网络进行验证。实验结果表明，该文所提出的有线无线融合流调度方案能为时敏业务提供稳定、有界的时延保障。

Research on Flow Scheduling Mechanism for Spacecraft Wired Wireless Hybrid Scenario

With the development of deep-space explorations in various countries, the demand for construction of space stations is increasing. However, a large number of data communication buses inside the spacecraft affect the payload of spacecraft to a certain extent. The wireless communication is introduced into spacecraft communication system. But, the traditional wireless communication can not guarantee the end-to-end delay for time-sensitive traffic. Therefore, this paper proposes a flow scheduling scheme for wire and wireless converged time-sensitive network. Firstly, a TDMA time slot allocation mechanism with separation of uplink and downlink communication is designed, the delay relationship between the type of services inside the spacecraft and the wired and wireless converged transmission link is modeling and analyzed. An objective function with the minimum average end-to-end delay of time-sensitive traffic is built. The time-slot allocation scheme is solved quickly by the particle swarm optimization algorithm. Finally, the proposed algorithm is tested on the Pycharm platform. Furthermore, a spacecraft sensor acquisition network is built on the EXata network simulation platform to test the performance. The results show that the proposed scheme can provide stable and bounded delay guarantees for time-sensitive traffic.