The Research On Data Storage And Forwarding Strategy In LEO Satellite System

In recent years,satellite communication has gradually replaced the traditional terrestrial communication in some fields,and has become an important component of global mobile communications gradually.It has been widely used in fields such as military field,disaster prevention,field investigation,offshore fishing and personal mobile communications.The next generation of broadband satellite communication system can provide a variety of multimedia services,such as audio,Internet of Things,which are necessary technologies to realize a full coverage of mobile terminal communication and Internet big data communication.With the steady and rapid development of satellite communication technology and optical communication technology,satellite communication technology,especially low-orbit optical satellite communication system,has contributed to all aspects of human social life.However,due to the limited resources of satellite systems,the effective management and utilization of resources in satellite communication networks is an important part of the current research field of satellite mobile communication networks.Through a large number of investigations and analysis of low-orbit satellite communication systems,this article studied the improvement of low-orbit satellite system capacity from two aspects.Firstly,we addressed the issue of resource management and utilization in low-orbit satellite communication systems.Considering the popularity of documents,success rate of satellite-earth access,and success rate of connection between ground stations,etc.,we proposed a resource forwarding strategy based on HMM,under the premise of improving the overall satellite resource forwarding amount and reducing the cost of file sharing and transmission between floors.The second research point focuses on the research of a single satellite.Considering the high-speed mobility of satellite nodes and time-varying satellite and satellite links in LEO satellite systems,a data caching control strategy based on satellite transmission capabilities is proposed and given.By optimizing cache control time,dynamically adjusts the rate of data transmission from other satellites to the satellite,and diverts part of the data to the next satellite serving the ground terminal for pre-caching,which improves the utilization of cache resources and transmission resources and reduces data transmission time.