Cognitive Model of Space Information Networks

With the characteristics of highly dynamic topology and limited-resources, space information network are difficult to match its huge applications requirements. These inherent characteristics make it vulnerable to security risks. Comparing to traditional terrestrial networks, it is more vulnerable to its environmental and security threats. At the same time, the space information network plays an important role in the national economy and military applications, it puts forward high demands on network security. Risk assessment can predict and diagnose the network security threats, provide decision-making basis for security policy and counter measures. It become an important part of network security protection system. To solve this problem, cognitive wireless network technology is used and the cognitive model of space information network is proposed. This model is based on annular cognitive structure, it consists of multi-domain sensing, intelligent decision and network reconfiguration. The network is divided into three layers, the local multi-domain cognitive layer, the regional collaborative cognitive layer and the network overall cognitive layer. Cross-layer method of the node is designed, thus the nodes can have the cognitive ability. Finally, it is to be achieved that the traditional module of passive adaptive environment can be changed and the space information networks can adapt to the surrounding environment.