Research On Inter-satellite Multiple Access Protocol Of Low Orbit Satellite Network Based On Propagation Delay

With the development of the Internet and big data,people have higher requirements for data transmission rate,bandwidth,and connection speed.Relying on ground networks alone cannot meet our needs.Due to the wide coverage of satellite networks and large network capacity Therefore,satellite communication will be a hot research direction in the future.Due to the limited on-satellite load and bandwidth resources of low-orbit satellite systems,a reasonable and effective inter-satellite resource allocation scheme plays an important role.In this context,a low-orbit satellite system is constructed in this paper.It also studies the multiple access methods and performance of inter-satellite link networking.This article first introduces the background of this topic and the current status of the development of satellite systems.Using the characteristics of satellite network propagation delay,the satellite's half-duplex working mode is converted to full-duplex working mode by setting the transmit and receive status of all nodes.It can realize that both communication parties send services to each other at the same time,thereby shortening the channel free time and improving the throughput of the entire network.Because the propagation delay is closely related to the design of the frame structure in this paper,we first analyze the distribution characteristics of the propagation delay across the entire network.Based on this feature,Combining the methods of time division multiple access and space division multiple access,the analysis of time slot scheduling is performed in two scenarios: multiple antennas and multiple radio frequency channels(MA-MRF)and multiple antennas and single radio frequency channels(MA-SRF).Under different service requirements,corresponding optimizations were made,and related suggestions were put forward for different business needs.This article makes full use of the space division feature to improve the time-frequency resource utilization and improve the system capacity.Through the simulation comparison between the multi-antenna multi-radio channel and the multi-antenna single-radio channel scenario,it is found that the increase in power consumption and cost can be exchanged for performance improvement such as throughput and delay.Because different routing schemes will affect the frequency of link usage to a certain extent and then affect the distribution characteristics of the network's propagation delay.Therefore,we combined the routing algorithms of the network layer to explore the impact on the resource allocation of the inter-satellite data link layer.We first analyze the changes of different routing algorithms on the propagation delay distribution characteristics of the entire network,and then analyze the effects of different routing algorithms on improving the efficiency of link layer resource allocation.The scheme proposed in this paper aims at guaranteeing the service quality of various information transmitted by LEO satellite networks as an optimization goal,and provides a new idea for the research of inter-satellite multiple access.