Research On Inter-Satellite Routing Strategy Of The Space-Ground Intergrated Information-Centric Network

With the deployment of many new network applications and the rapid increase of the terminal equipment,the reliance of people on the network is unprecedented.The construction of ground network is no longer sufficient to support complex business.In order to cope with the lack of ground network,the Space-Ground Intergrated Network(SGIN)which is combined with satellite,space and ground is proposed.Depending on the wide coverage of satellite to the ground,and strong invulnerability,the SGIN can realize the large-scale and non-blocking communication.During the construction process based on the TCP/IP protocol stack,there are some problems in the inter-satellite routing strategy such as low content delivery efficiency.The Information-Centric Networking(ICN)can solve these problems effectively.Therefore,we launch the research on the Space-Ground Integrated Information-Centric Network(SGI~2CN).The main research contents are as follows:1.Aiming at the problems of large routing table,frequent routing updates,and low transmission efficiency caused by the high dynamics of the low-orbit satellite network topology,limited node resources and large number of ICN contents,a hierarchical routing model of SGI~2CN network divided according to the characteristics of the ground area is proposed.In this model,by dividing the overall network into smaller autonomous domain networks,the scale of the routing table and routing updates are controlled within a certain range,so as to reduce the pressure of node calculation and storage,and reduce routing overhead.Then,according to this model,combined with the network cache,an inter-satellite routing mechanism based on content names is proposed.The inter-satellite routing process is divided into two parts:intra-domain and inter-domain.The transmission method of name routing and multiple content sources reduces propagation delay and improves transmission efficiency.2.On the basis of the above architecture,designing the corresponding routing algorithms respectively.To solve these problems such as limited satellite resources and unstable inter-satellite links,a optimal path algorithm based on the link status is proposed.The comprehensive evaluation of link status reference delay,link bandwith and link switching probability.In inter-domain routing process,the mapping of domain boundary nodes is the main problem.A domain boundary node mapping algorithm based on the multi-attribute decision making algorithm is proposed.First,giving the node status evaluation function,then sorting the nodes reference the node status and choose the best node.In terms of request hit rate,delay,packet loss rate and throughput,the simulation results show that the intra-domain routing algorithm are better.And the domain boundary node mapping algorithm can ensure the long-term benefits of the network.