关键词: 空间信息网络, 软件定义网络, 接触图, 路由

Abstract: Space information network has many characteristics, such as heterogeneous network, time-varying topology, limited storage and computing capability of network nodes, and tedious maintenance and upgrading of space equipment and so on. It means that the solutions to large space-time span network architecture, dynamic network routing and other issues of space information network are badly desired. Thus, this paper devises a routing mechanism for space information network based on SDN (software defined networking) and contact graph. Firstly, aiming for the problems of heterogeneous network and tedious maintenance and upgrading of space equipment, this paper introduces SDN data control and independence to set the network architecture. Then, according to the cyclical time-varying topology of the space information network, this paper proposes a pre-computed multipath routing mechanism and a dynamic response routing strategy based on contact graph. Simulation results prove that the proposed routing mechanism can enhance the rate of data transmission and the capability of dealing with network failures, thus, it is feasible and effective.

Key words: space information network, software defined networking, contact graph, routing