低轨卫星网络回传业务的容量及吞吐量研究

Research on Capacity and Throughput of Backhaul Traffic in LEO Satellite Networks

针对低轨卫星网络拓扑动态性,根据反向缝与关口站的位置关系,抽象出六张星地拓扑快照,以分区离散化处理地面业务流量分布。利用基于虚拟源节点构造改进的推拉流算法研究容量及最大吞吐量,分析容量时仅考虑网络自身条件,分析吞吐量时增加业务流量分布的条件。在仿真中,分析网络容量及吞吐量,并得到上行接入带宽、星间链路带宽、馈电链路带宽的最佳设计比为1:8.6:18。研究结果可为路由算法设计提供吞吐量的参考值,并支撑星座带宽匹配设计。

According to the position relation between the cross seam and gateway stations, low-earth-orbit (LEO) satellite network is abstracted as six snapshots of satellite-ground topologies to deal with topology dynamic problems, and thus the ground traffi c distribution is processed regionally and discretely. Based on the virtual source nodes, an improved push-pull fl ow algorithm is proposed to investigate capacity and maximum throughput. The analysis of capacity merely considers the network’s own conditions, while the analysis of throughput further needs a known traffic distribution. Simulations analyze the capacity and throughput and obtain that the optimal ratio of uplink access bandwidth, inter-satellite link bandwidth and feedback link bandwidth is 1:8.6:18. The results provide a throughput reference of designing routing algorithm, and support the matching design of constellation bandwidth.