Research On Satellite Internet Of Things Based On Content Center Network

In recent years,the Internet of Things has been widely distributed in the region and the device terminals have been increasing rapidly.In response to the needs of the times,the satellite Internet of Things has emerged.The architecture problem under the satellite Internet of Things is an urgent problem to be solved.Due to its special satellite application environment characteristics,the satellite Internet of Things faces three major difficulties in the design level.The first is that the traditional network structure does not adapt to the emerging satellite Internet of Things.All devices accessing the satellite at the same time will bring various problems.Second,the network routing topology changes frequently,there are many types of satellites,and there are many problems in combination with the terrestrial network.Third,users frequently request application content will cause huge transmission load on the satellite.In response to these problems of the satellite Internet of Things,considering the traditional satellite network allows all nodes to access the satellite,a novel satellite IoT architecture is proposed by using the technology of Content Center Network(CCN).To further alleviate congestion,we design a Tree-based Ant Colony(TAC)routing algorithm to speed up data processing in satellite IoT.In addition,for the special environment of the satellite Internet of Things,we have proposed a layered caching scheme,which aims to improve the cache rate of content in a limited cache space.The main research contents and innovations of this article are as follows:(1)For the satellite IoT architecture,we analyzed the traditional satellite IoT architecture,and then proposed a satellite-based IoT architecture based on a contentcentric network.Composition of forwarding engine.The user is the requester of the data,that is,the sender of the interest packet.The user no longer needs the address of the content to request the content,just indicate the name of the data,then send out an interest package,and encrypt and sign this package.This will reduce the conflict and congestion directly caused by a large number of IoT devices.(2)For the routing under the proposed architecture,we propose a fast routing optimization solution based on the ant colony algorithm.Since each SR of the CCN network may have a copy of the content,users need to find the content corresponding to the interest faster.And users need to get this content through a shorter path.This paper proposes a new algorithm to solve this problem.The algorithm consists of two parts.First,by obtaining a spanning tree,the pheromone concentration of the ant colony is initialized by this spanning tree.It makes it easier for ants to preferentially choose a central node with a large amount of content to find the corresponding interest first.(3)For the caching in the proposed architecture,we propose a hierarchical caching mechanism for the satellite Internet of Things based on the content-centric network.From prefetching based on the content characteristics of certain content to a given heat value,the network is divided into clusters.The cache cluster is first determined by the heat value.In the cluster,content popularity is mainly used to measure content,and node cache update rate and node center to determine the cache location within the cluster.Effective intranet caching makes network communication more convenient and faster.