Research On The SDN-Based Controller Of Space-Sky Information Network

With the rapid development of global network, the communication network on the ground cannot meet the needs of the global telecommunication, people tend to the development of the space-sky network. But aerospace network and terrestrial networks have a big gap in terms of network protocols, topology and link environment. In terms of network protocol, the space network cannot use the IP protocols which is in the ground network. The topology of the space network is time changing in full sense. Communication nodes and control nodes are in a constant state of change. The overall control of the space network is fairly difficult.Based on learning more about space network characteristics, In this work, we focus on designing the space controller system redesigning the configuration strategy of the network controllers and the shortest path algorithm. The main work and innovation of the paper are as follows.In this work, we put forward of the software design network, separating the control plane and forwarding plane, completing the space network controller in the method of software. Based on the location of the communication nodes, we redesigned model of the space-sky network. Furthermore, we study the configuration strategy of the controller system based on the special character of satellite node. To design the configuration strategy, we use the method of regionalism. We fully consider the topological structure characteristics when calculating the*weight of transmission delay, for this, we can improve the overall control ability of the controller system.In this work, we also should redesign the shortest path algorithm for the space network. As there are many difference between the space network and ground network, like the topology of the space network changing every time, the transmission link constantly switching, when we redesign the algorithm, we should consider the time-varying parameter, separating the time period, focusing every time quantum, then we can calculate the exact path. Using the improved algorithm, we can reduce the time delay.Based on the design of the space control system, we realized the controller function module. The new controller can solve the issue of network topology varying and support the telecommunication between different controllers. For adopting the space sky environment, we should modify the flow table of the openflow to support the protocols using in the space network. In addition, we can modify the topology service, realizing the shortest path algorithm. In the last, we simulate the new controller in mininet platform, testing its performance.In this paper, we solve the problem of space network using the concept of SDN. By redesigning the configuration strategy and shortest path algorithm, we can improve the responding speed when the topology changing frequently, then, we relize the goal of merging together the space network and ground network.