一种基于卫星节点的时变拓扑网络模型

A Satellite Node Based Time-varying Topological Network Model

卫星网络与地面固定网络有着本质的差别,特别是它的时变特性,使得成熟的固定拓扑网络理论不能很好地应用到卫星网络中。将卫星网络抽象为以时间为变量的周期函数矩阵,并引入图论,提出一种基于卫星节点的时变拓扑网络模型,讨论模型中节点间的关系和模型离散化条件,给出该模型的离散化形式以及离散时间序列选取原则和相应的证明和仿真,最后指出现有的虚拟节点、有限状态自动机、快照系列、动态虚拟拓扑等研究卫星网络的方法都可以纳入所提出的模型框架中。

Satellite network is essentially different from fixed network on ground,especially its a time-varying characteristic,therefore the mature nework theory that based on the fixed topological can not be applied to satellite network availably.In this paper,to describe the characteristics of satellite newoke,a periodic function matrix is given and introduced to the current graph theory.Then a time-varying topological network model based on satellite nodes is proposed.The relations among network nodes and the discretization condition of model are discussed.A discrete model of satellite time-varying topological network is proposed.The rule how to get the discrete time sequences is proposed and some laws about it are proved and simulated.At last,it is indicated that the methods which is being used to study satellite networks,such as virtual nodes finite state automaton(FSA),snapshot,dynamic virtual topology routing(DVTR),all can be included in the proposed model.