Data Naming And Caching Of LEO Mega Satellite Constellations For Internet Of Things

With the development of 5GB/6G technology,massive access to wireless devices and the generation of big data,the Internet of everything and intelligent interconnection have become a vital enabler for a new generation of information technology development,which poses a critical challenge to the traditional host-centric IP interconnection technology and also gives birth to the Information-Centric Networking(ICN)as an important choice for future Io T technology.On the other hand,with the rapid development of microsatellite technology and launch vehicle technology,building a Low Earth Orbit(LEO)satellite mega-constellation with hundreds or even thousands of satellites to provide global coverage,low latency transmission and high performance Internet access has become a reality.Also,making the LEO giant satellite constellation become an ideal network architecture to support the interconnection of everything and intelligent interconnection.Accordingly,a new concept of LEO satellite mega-constellation information centric networking for Io T(LEO-SMC-ICN-Io T)is proposed by integrating LEO satellite mega-constellation and ICN.Around ICN data naming and caching,research on data naming and caching mechanism of LEO satellite mega-constellation for Io T.The research content mainly includes:Firstly,the framework of LEO-SMC-ICN-Io T is proposed.The LEO satellite mega-constellation for Io T and inter-satellite link(ISL)characteristics are analyzed.Moreover,the routing and caching process are analyzed for the application scenario of LEO-SMC-ICN-Io T.Secondly,a data naming mechanism for LEO satellite mega-constellation is proposed.By analyzing the Io T data distribution requirements of LEO-SMC-ICN-Io T,the ICN hierarchical,multi-components,and hash flat-in-one(ICN-HMc H)data naming mechanism is proposed.The naming structure includes the root prefix layer,the task type layer,the service type layer and the inter-network function and local node identification layer.Also,the data transfer process is analyzed,including information distribution,content source acquisition and chunked data request download.Thirdly,a data caching mechanism based on random forest algorithm is proposed.By analyzing the prediction of content popularity and satellite node location,combining both node dimension and content dimension,the random forest caching(CARF)data caching mechanism is proposed based on the lifetime and freshness of Io T content.CARF makes cache matching rules between satellite nodes and content by using the correspondence between multidimensional state attributes including cache rate,replacement rate,popularity,etc.and cache viscosity.According to the matching rules,the matching relationship between satellite nodes and content is predicted for future moments,hence guiding the deployment of the constellation's web cache.Fourthly,the LEO satellite mega-constellation for Io T data naming and caching demonstration simulation validation platform was developed based on the satellite vision simulation software Sa Vi and the network simulator(NS3).The platform consists of infrastructure layer,network model layer,network configurations layer and control layer,includes ground segment ground station and space segment constellation networking,satellite node movement model,broadcast channel configuration,ISL and satellite-ground link update,etc.And finally,the performance of the proposed data naming method and caching mechanism is validated by applying the developed LEO satellite mega-constellation for Io T simulation platform.Simulation results show that(1)compared to the classical IP,ICN-HMc H can provide low latency and high throughput,with better performance in terms of data transfer efficiency,hence provide high quality of service.(2)Compared to LCE,OPP,LCD and prob0.5,CARF is more efficient with average hop count,hit rate and throughput.The caching performance is significantly improved and the quality of experience is enhanced.