Aloha enhanced access method for low-orbit constellation system

Abstract

The invention relates to an Aloha enhanced access method for a low-orbit constellation system, belongs to the field of satellite communication, and is used for solving the problem of quick access whena high-dynamic terminal communicates with a new generation of low-orbit constellation system. The method comprises the following steps: firstly, constructing a system satellite access system model; reserving different numbers of channels for users with different priorities of the related high-dynamic terminals in advance; when the user terminal has an access demand, calculating the specific moment of sending the data packet by utilizing access control; when the data packet is sent, enabling the user terminal to divide a channel into time slots by utilizing a local clock and randomly puts thedata packet into the time slots to be sent; finally, utilizing the characteristic that the user terminal is covered by multiple satellites of the system in the communication process, wherein after receiving the data packet, each receiving end satellite forwards the data packet to the low-orbit constellation system for interference elimination until all the data packets are successfully decoded orthe maximum number of iterations is reached. According to the method disclosed in the invention, the throughput rate and packet loss rate indexes of the system can be optimized, the resource utilization rate is improved, and the first access success rate of the high-dynamic terminal can be optimized.

Description

technical field [0001] The invention provides an Aloha enhanced access method oriented to a low-orbit constellation system, belonging to the field of satellite communication. The invention mainly relates to a reliable fast access method for a high dynamic terminal of a low-orbit constellation system. Background technique [0002] With the development and maturity of "aerospace technology", the concept of a high-performance low-orbit satellite system that meets the requirements of diversified and real-time development of low-earth orbit satellite (Low Earth Orbit, LEO) information services has emerged as the times require. The current business requires strong on-orbit information forwarding and processing capabilities. At the physical level, the low-orbit satellite system is close to the surface, and its link loss and delay are relatively smaller than those of medium- and high-orbit satellites. It has lower requirements for satellite volume and power consumption, and can for...

AI Technical Summary

Problems solved by technology

However, because the user terminal sends the same data packet multiple times in the same channel, the throughput and packet loss rate indicators of ECRA become very poor under high load conditions, and the receiving end can hardly decode the complete data packet successfully. The access of user terminals cannot be guaranteed, and the success rate of first-time access of highly dynamic terminals cannot be guaranteed

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