Research And Design Of Business Process For LEO Satellite Internet Of Things Based On NB-IoT

As the result of information revolution,Internet of things has been increasingly close to our lives.Considering remote areas with special locations and imperfect infrastructure,especially the strong demand for the deployment of IoT terminals in large factories,LEO satellites,as the only means of achieving global coverage,provide new solutions to this need combined with the Internet of things.As a novel concept,"LEO satellite Internet of things" will face a severe challenge from proposing the architecture to the commercialization.The deployment and operation of a network architecture depends on business support.Firstly,the paper describes the background and development of the LEO satellite IoT,and provides an in-depth understanding of the narrow-band IoT architecture and basic knowledge of satellite communications,providing a theoretical basis for the design of low-orbit satellite IoT business processes.At present,there is no related research on the LEO satellite IoT business process.Therefore,this paper proposes a business process for the LEO satellite IoT architecture in combination with the overall process of the narrow-band IoT,which provides reference value for the deployment of the network architecture in the future.The main research business processes are data service transmission process and security authentication process.The process is improved for solving the incompatibility of the narrowband IoT data transmission business process in the satellite environment.This paper proposes a segmented data service transmission process,which distributes the transmission between the terminal and the satellite and signal to the gateway and then enters the core network into two segments.The first segment proceeds simple transmission to reduce the problem of excessive context storage caused by disconnection.The second segment establishes a data processing gateway in the gateway to interact with the base station to integrate with the ground core network.The simulation proves that the improved process in the satellite environment has better performance in terms of throughput,packet loss rate and transmission delay than the narrowband IoT process.In view of the tremendous pressure faced by satellites in the traditional IoT connection,combined with the principle of satellite digital TV conditional access system,this paper proposes a LEO satellite IoT authentication strategy.According to different user groups,different authentication policies are adopted.Massive common group terminals adopt the method of broadcasting authentication by group.Some intermediate users who have security requirements but have low real-time requirements adopt one-to-one authentication mode.The advanced user group terminals with particularly strong confidentiality like military industry adopt the method of direct satellite authentication.A lightweight authentication strategy ensures both security and authentication efficiency.Feasibility of broadcast authentication is assessed by broadcast authorization bandwidth estimation and capacity analysis.