As a platform for data transmission, space data relay network (SDRN), which has high coverage and continuous communications, provides data relay services for the spacecrafts and satellites by allocating antenna resource. However, the diversity between emergency tasks and common tasks for antenna requirements may result in the conflicts of resource occupation. This leads to the loss of emergency information and the low scheduling efficiency. In this paper, a real-time dynamic scheduling (RTDS) scheme is proposed to ensure the transmission of emergency tasks and improve the scheduling efficiency by scheduling sequence adjustment and task management. Firstly, the relative SDRN system models are given and a dynamic scheduling mechanism is designed to deal with the disturbance factors during the scheduling process. Then, based on the dynamic scheduling mechanism, the RTDS scheme is implemented in three stages, which include initial scheduling, dynamic scheduling for emergency tasks, and final scheduling. The simulation results demonstrate that the proposed RTDS scheme can guarantee the timely transmission of emergency tasks and enhance the scheduling efficiency compared with the existing scheduling algorithms.

中文翻译：

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空间数据中继网络中紧急任务的动态调度

作为数据传输的平台，具有高覆盖范围和连续通信的空间数据中继网络（SDRN）通过分配天线资源为航天器和卫星提供数据中继服务。但是，紧急任务和天线要求的常规任务之间的差异可能导致资源占用的冲突。这导致紧急信息的丢失和调度效率低。本文提出了一种实时动态调度（RTDS）方案，通过调度顺序调整和任务管理，确保应急任务的传输并提高调度效率。首先，给出了相关的SDRN系统模型，设计了动态调度机制来处理调度过程中的干扰因素。然后，基于动态调度机制，RTDS方案分三个阶段实施，包括初始调度，紧急任务动态调度和最终调度。仿真结果表明，与现有调度算法相比，所提出的RTDS方案能够保证紧急任务的及时发送，提高了调度效率。