Link fault recovery method based on time sequence link weight graph in space-air-ground integrated network

Abstract

Space-Air-Ground Integrated network (SAGIN) that integrates satellite system, air network and ground communication network has attracted extensive research interests in recent years, for its high value to practical services and its wide applications in communication. Nevertheless, it also faces many unprecedented challenges due to its heterogeneity, selforganization, time variability and other characteristics. In order to solve the problems of unstable inter-domain neighbor relationship, frequent routing update and slow routing convergence in space-air-ground integrated network, a link fault recovery method of space-air-ground integrated network based on time sequence link weight graph is proposed in this paper. This method is based on the infrastructure of software-defined network, and introduces time-varying characteristics, designs a dynamic model of link weight change, and proposes a link fault recovery method. The simulation results show that by considering link resources and node resources, compared with the link detection and recovery scheme of softwaredefined satellite network, this method can effectively solve the problem that it is unable to build an effective recovery path because of the unstable inter domain relationship in the space-air-ground integrated network, and can effectively find a recovery path with the lower path cost, low end-to-end delay and high reliability.