基于时延的软件定义卫星网络控制域规划策略

现有软件定义网络（SDN）多控制器划域研究大多基于拓扑相对固定的地面网络，难以适应拓扑动态变化的卫星网络，而现有卫星网络研究在处理时延问题时大多只考虑传播时延。针对这一问题，在建立模型时引入控制器处理时延、排队时延对划域的影响，提出了一种面向软件定义卫星网络（SDSN）的时延分析模型。借助该模型进行SDSN多控制域的划分。经过仿真验证，与现有的地面SDN多控制域规划算法及卫星网络控制域划分方法相比，该算法能够更好地适应卫星网络环境，有效降低网络时延，使控制器间负载均衡性能提升40%以上。同时迭代跳出机制使得算法运行速度快，能够适应卫星网络拓扑的快速变化。

Domain Balanced Partition Based on Delay Optimization in Software Defined Satellite Networking

Aimed at the problems that existing software defined network (SDN) multi-controller domain partitioning algorithms are mostly based on the ground networks with fixed topology, difficult to adapt to the satellite network with dynamic topology, and most of the existing satellite network researches are only in consideration of the propagation delay, a software defined satellite network (SDSN) delay analysis model is proposed in view of processing delay and queuing delay. On the basis of this model, satellite network multi control domains are divided. The simulations prove that this algorithm can adapt to the satellite network environment better compared with the existing ground SDN multi control domain planning algorithm and the satellite network control domain division method. Besides, the algorithm can effectively reduce the network delay, and increase the load balancing between the controllers by more than 40%. Moreover, the iteration stopping mechanism makes the algorithm run fast, and can adapt to the rapid changes of the satellite network topology.