空间站空间传输链路带宽分配算法

Research on bandwidth allocation of the space station transport link

针对星上资源的限制问题,提出了多节点空间站空间链路带宽分配算法。首先,将中继卫星等效为一个缓冲区容量和服务速率有限的基本型(stochastic fluid model,SFM)节点,建立了由空间站节点和具有星上处理能力的卫星节点构成的串型SFM节点链模型(serial multi-nodes SFM,SMSFM);以此为基础,建立了考虑星上传输能力约束的带宽资源分配模型,运用无穷小摄动分析方法和随机逼近理论,提出了相应的带宽资源分配算法;最后,通过仿真实例验证了带宽分配算法的性能。仿真结果表明,该算法能够较好地逼近业务流的实际带宽需求,能够有效提高网络的带宽资源利用率。

Considering the limits of on-board resource,the multi-nodes bandwidth allocation algorithm of the space station transport link was put forward.First,the regenerative relay satellite is equivalent to a basic SFM node with limited buffer capacity and service rate,serial SFM node chain model SMSFM（serial multi-nodes SFM） is established built up with the space station node and relay satellite node with on-board processing capacity.On this basis,a bandwidth cross-layer allocation model is established.The IPA method and SA theory are used to introduce the corresponding bandwidth resource cross-layer allocation method.Finally,the performance of the algorithm introduced in this paper is validated through a simulation example,and the influence of limited on-board processing resources on system performance through simulations is analyzed.Simulation results show that the bandwidth allocation algorithm introduced in this paper can better approximate actual bandwidth demand of service flows and effectively improve network bandwidth utilization.