Research On Satellite Internet Admission Control Strategy Based On Traffic Perception

As one of the deterministically important technologies of the next generation mobile communication,the satellite internet communication system can break through the terrain limitation,realize the real global seamless coverage,provide the global users with access service on demand,and realize the intelligent connection of everything.Due to the rapid growth of global users and the non-uniform distribution of user services,beam-hopping system is developed which can improve the utilization rate of on-board resources.The new resources allocation mode also brings new challenges to radio resource management.How to optimize the resources in beam hopping system becomes one of the hot research topics that need to be solved.As one of the important technologies of radio resource management,admission control strategy can reduce blocking rate and improve utilization rate of radio resources.This dissertation solves the admission control problem of satellite internet from three aspects as follows:1.In satellite internet communication system,operators are committed to optimizing the available resources on demand and providing high quality of service to improve customer’s satisfaction and reduce the errors of packet information loss and delay.As one of the prerequisites for admission control,how to accurately classify traffic types is one of the major challenges of the current satellite internet.In satellite internet,there are many types of services with sudden occurrence.The channel interruption by high mobility of satellite and the instability of inter-satellite link transmission will affect the traffic characteristics.In chapter 3,this dissertation researches satellite internet traffic source and type,and then according to the characteristics of the traffic sources and the disadvantage of density peak clustering algorithm,puts forward the improved traffic sensing algorithm,which solves the problems of difficult selection of truncation distance and wrong discrimination of edge points in the traditional density peak clustering algorithm,effectively improves the accuracy of clustering.Build a satellite Internet traffic simulation platform,and collect the traffic by satellites,finally verify the better performance of the proposed algorithm.2.Aiming at the admission control problem of low orbit satellite beam-hopping system,the dissertation studies the existing admission control strategies of ground communication and multi-beam satellite communication systems.In chapter 4,analyze the influence of resource allocation mode of hopping beam system and multi-beam system on admission control strategy.Due to the uniqueness of beam hopping resource grid and the flexibility of time slot allocation,the previous admission control strategy can’t well satisfy the new system requirements.This dissertation studies the time-frequency resource utilization of beamhopping system deeply,and constructs the mathematical model of beamhopping system’s admission control problem according to the two situations.By taking full advantage of the high dynamic nature of beamhopping system’s beam pattern,this dissertation puts forward the optimal selection method based on temptation feedback,designs the admission control strategy in the hopping beam system,and uses the carnivorous algorithm to solve the proposed selection method to determine the optimal admission control scheme.3.In order to verify the traffic sensing algorithm and admission control strategy proposed in Chapter 3 and Chapter 4,This dissertation adopts OPNET and STK to build an internet simulation platform for loworbit satellites.Design the satellite constellation,beam modeling in multi beam and hop beam satellite communication system,complete the network topology modeling and node distribution design,and simulate the coverage of real satellites by STK.At the same time,in order to simulate the actual communication protocol process,built up a satellite internet protocol stack in OPNET based on 5G ground protocol stack,complete the random access process,and design the admission control process.Design the interface between heterogeneous platforms,realize the linkage between constellation topology simulation and network protocol simulation,complete the data transmission between the two platforms and the characterization of simulation results,and finally verify the performance of the proposed traffic sensing algorithm and admission control strategy.