Research On On-demand Beam Scheduling Technology For High-throughput Satellites Internet

With the development of mobile communication,conventional communication satellite system can no longer meet the increasing speed and connection density requirements of the users.Therefore,the research on Internet of high throughput satellite is becoming more and more important.At present,high throughput satellite technology has been applied to geostationary satellites.As the integration of the satellite and 5G,high throughput satellite technology will be further studied in the LEO scenario,to provide all-weather ultra wideband communication services for terrestrial users.However,unlike the conventional geostationary satellite scenario,how to adapt to the flexible and uneven terrestrial traffic demand and improve the downlink system throughput in the LEO satellite scenario is an urgent problem in the current research of high throughput satellite.To solve the above problem,this paper proposes a on-demand beam scheduling scheme for Internet of high throughput satellites.The on-board resource utilization is improved by using fewer beams to cover more cells by time-division multiplexing,and the cluster precoding is carried out by relying on the beam sparsity brought by on-demand beam scheduling,to further suppress the interference between beams and improve the system throughput.Firstly,the model of LEO high-throughput satellite downlink system is constructed,and the feasibility of hybrid beamforming architecture is discussed,the model of the LEO satellite downlink channel is built subsequently.The queue model in the LEO high throughput downlink system is analyzed,which lays the foundation for the establishment of the problem model and the stability qualitative analysis of the following on-demand beam scheduling.Secondly,this paper studies the on-demand beam scheduling scheme of LEO high-throughput satellite,and establishes the dynamic beam scheduling optimization model to ensure the on-board resources utilization.In order to solve the problem,a dynamic beam scheduling scheme based on the idea of "relaxation-discretization" is proposed.The problem is solved in three steps,and the stability of the relaxation optimization objective and the corresponding "longest queue based" discretization principle is proved.Thirdly,because the on-demand beam scheduling scheme can not eliminate the inter-beam interference completely through the space isolation formed by the beam scheduling,this paper proposes a high throughput satellite downlink precoding scheme based on beam scheduling.Considering the beam scheduling scheme above,this paper constructs the equivalent downlink channel model,and proposes a cluster precoding scheme with low complexity according to the sparsity of the beam s,which effectively suppresses the inter-beam interference and improves the throughput of the system.Finally,the simulation results show that the beam scheduling scheme for high throughput satellite can improve the throughput of the system on the basis of ensuring the on-demand allocation of high-throughput satellite resources.