Research On Resource Dynamic Control Strategy Of Centerless Satellite Communication System Based On TDMA

With the continuous advancement of China's "air-space integration" strategy,the role and position of satellite communication have been strengthened.Traditional satellite communication systems usually adopt a centralized management and scheduling method.The earth station network access,exit,service application,resource allocation,etc.are managed and scheduled through a unified central station.This method can maximize the use of satellite communication resources.However,this typical centralized management system also brings greater risks.Since the central station is responsible for network control,scheduling,and management functions,the network is extremely dependent on it,resulting in high cost and poor mobility of the central station.In the environment of military confrontation,the central station as the center of the system will become the key target of enemy forces.Once the central station fails,the entire satellite communication network that depends on it will be paralyzed.The centreless satellite communication system is a typical distributed system without obvious central station nodes.The system has low cost and strong survivability.It has practical value in military communications,emergency communications and other occasions.This paper focuses on the TDMA(Time Division Multiple Access: Time Division Multiple Access)system resource control strategy for the centerless satellite communication system.Aiming at the problem of low resource utilization of existing algorithms under asymmetric services,the TDMA frame structure and centerless TDMA are designed.The system service communication strategy proposes a dynamic resource control algorithm that supports asymmetric transmission.The algorithm uses a greedy reservation method to ensure the low delay characteristics of the terminal station to establish communication services,and improves the system's time slot resource utilization through dynamic adjustment.Enhance the load capacity of the system to meet the business communication needs of the centerless satellite communication system.Then,the feasibility and correctness of the proposed method are demonstrated by comparing the system service call rate and average service connection delay through software simulation and existing algorithms.In order to verify the practical feasibility of the algorithms and strategies proposed in this article,a hardware-in-the-loop simulation system based on the C/S(Client/Server)architecture is proposed.The channel delay,signaling errors and various detection errors generated in the satellite communication process are all in the Server Uniform simulation at the end level,the client-side access control program is fully developed in accordance with the software framework developed by the final terminal,and it can be directly used on the actual satellite communication terminal only by changing the transceiver interface.Through the hardware-in-the-loop simulation system,the performance test of the dynamic control algorithm and resource dynamic control strategy of the centerless TDMA satellite communication system is carried out,and compared with the software simulation results,the results show that the method in this article can run reliably on the hardware-in-the-loop simulation system.