移动卫星网络信息资源管理策略仿真研究

Research on Topology Generation Strategy of Satellite Variable Network Based on Link Characteristic

移动卫星网络节点具有高度动态性,在进行拓扑构建会受到卫星服务时间、星间距离、星间链路剩余能量、带宽等信息资源的影响,最终带来网络资源消耗多和稳定性差的问题。针对上述问题,提出了一种分布式拓扑生成算法策略。上述策略从链路特性出发构建代价模型,利用层次分析法进行权重的计算,然后在度的约束下,每颗卫星根据代价值分布式选择局部最优路径生成全局最优拓扑,构建过程综合考虑卫星各信息资源,提高了拓扑网络的合理性和真实性。仿真结果表明,改进算法有效的减少了链路切换次数、平衡了卫星资源使用率,最终改善了网络的稳定性。

Mobile satellite networks are highly dynamic. During the construction of the topology, it will be influenced by many factors, such as satellite service time, inter-satellite distance, the residual energy, bandwidth of inter -satellite link and so on, which eventually lead to the question of poor network stability and much resource consumption. Aiming at this problem, this paper proposed a distributed topology generation algorithm. Based on the strategy, we constructed the cost model based on the link characteristics, and used the analytic hierarchy process to calculate the weight. Then under the constraint of the degree, the global optimal topology was constructed through distributed selecting local optimal path for each satellite. In the process of construction, the information resources were comprehensively considered, which improved the rationality and authenticity of the topology network. Simulation results show that the proposed algorithm can effectively reduce the link handover, balance satellite energy consumption, and ultimately improve the network stability.