Research On Reliability Evaluation Algorithm Based On Jump-plane Nodes And Petri Net In Space Information Networks

Space information network is different from the ground network,because of its high dynamic,long time delay,frequent link switch,open distribution and running in hostile environment,etc.first of all,space electromagnetic environment and other objective or subjective factors may lead to network node or link failure,network performance decline,resulting in paralysis of the entire network even;secondly,with the development of science and technology,people on satellite communication system performance and operational requirements also gradually improve.Therefore,it is important to evaluate the reliability of a given space information network with the efficient and accurate algorithm.A reliability evaluation algorithm based on jump-plane nodes and petri net in Space information Networks,the completion of the establishment of reliability evaluation indicators,dynamic data acquisition and processing and reliability evaluation of three parts.Algorithm respectively based on topological structure and based on the business flow of the two aspects are evaluated.The former is mainly connected reliability and survivability evaluation,while the latter is evaluation of the reliability of the network business.In the connectivity reliability and survivability evaluation process,to build a network of static topology and establish hop plane,computing network connectivity reliability,when a node or link failure,network connectivity reliability degree of decline,the network survivability assessment.In the business process of the reliability assessment,the establishment of network based on Petri net model evaluation.To collect the required data.To calculate the performance index of the network,the reliability of different business needs assessment network business.By using NS-2 and matlab network simulation software to simulate the proposed algorithm,the results show that:the algorithm can effectively evaluate the space information network reliability,for building topology of high reliability,ensure the data reliable transmission provides a strong basis,can effectively avoid the failure parts or congested area,improve the network survivability.