Resource scheduling mechanism of LEO satellite networks is the key to determining communication efficiency. Facing the LEO satellite networks with the dynamic topology changes, varying service requirements, and intermittent inter-satellite links (ISLs), the state-of-the-art cannot achieve high resource efficiency under both heavy and burst traffic loads, and the applicability of parameters design is insufficient under intermittent ISLs. Considering this, we propose a dynamic even distribution mechanism combined with network coding DENC. This novel mechanism obtains the service requirements and allocates resources dynamically through the even distribution algorithm to balance network maintenance overhead and resource waste and improves the success probability of transmission based on network coding to balance retransmission and redundancy. In this paper, we establish performance analysis models to optimize the parameters such as maintenance frequency and coding coefficient. Besides, we construct a system-level simulation platform. Mathematical and simulation results indicate that the resource efficiency of EMNC can be improved by more than 48% compared with SAHN-MAC, ICSMA, CSMA-TDMA, and HTM when all nodes have service needs, and the ISL outage rate is 20%. As the outage probability of ISL increases and the proportion of nodes with service requirements decreases, the performance advantage of EMNC becomes more apparent.

中文翻译：

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结合网络编码的低地球轨道间卫星网络动态均匀分配资源调度机制

LEO卫星网络的资源调度机制是决定通信效率的关键。面对动态拓扑变化、变化的服务需求和间歇性星间链路（ISL）的低轨卫星网络，现有技术无法在大流量和突发流量负载下实现高资源效率，并且无法满足低轨卫星网络的适用性。间歇性ISL下参数设计不足。考虑到这一点，我们提出了一种结合网络编码DENC的动态均匀分配机制。该机制通过均匀分布算法动态获取业务需求并分配资源，平衡网络维护开销和资源浪费，并基于网络编码提高传输成功概率，平衡重传和冗余。本文建立性能分析模型来优化维护频率和编码系数等参数。此外，我们构建了系统级仿真平台。数学和仿真结果表明，当所有节点都有业务需求时，EMNC的资源效率比SAHN-MAC、ICSMA、CSMA-TDMA、HTM可提高48%以上，ISL中断率为20%。随着ISL的中断概率增加和有服务需求的节点比例减少，EMNC的性能优势变得更加明显。数学和仿真结果表明，当所有节点都有业务需求时，EMNC的资源效率比SAHN-MAC、ICSMA、CSMA-TDMA、HTM可提高48%以上，ISL中断率为20%。随着ISL的中断概率增加和有服务需求的节点比例减少，EMNC的性能优势变得更加明显。数学和仿真结果表明，当所有节点都有业务需求时，EMNC的资源效率比SAHN-MAC、ICSMA、CSMA-TDMA、HTM可提高48%以上，ISL中断率为20%。随着ISL的中断概率增加和有服务需求的节点比例减少，EMNC的性能优势变得更加明显。