Low-orbit satellite Internet of Things channel resource dynamic allocation method based on SDN

Abstract

The invention provides a low-orbit satellite Internet of Things channel resource dynamic allocation method based on SDN. In an access matching flow table calculation step, the distance between the sub-satellite point position of each satellite and the geographic grid where a satellite Internet of Things terminal is located is calculated through a ground controller to judge which satellite should be selected by the terminal for access; in a satellite channel resource dynamic allocation step, the QoS grade, the quantity, the minimum access success rate limit and the satellite available resourcesof the access terminal service are calculated through a satellite controller, and the channel resources are dynamically divided; and in an access control assisted random access step, competitive random access is carried out according to the channel resources allocated by the terminal. According to the method, on the basis of an SDN architecture, channel resources are allocated through cooperativeoptimization of the ground controller and the satellite controller, so that the access success rate of high-priority services is maximized and the access performance of services with different priorities is guaranteed while the success rate of accessing channels of services with medium and low priorities is not lower than a specified threshold value.

Description

technical field [0001] The invention relates to a method for dynamically allocating channel resources of a low-orbit satellite Internet of Things based on a software-defined network (Software Defined Network, referred to as SDN), which belongs to satellite communication technology. Background technique [0002] In recent years, the Internet of Things (Internet of Things, referred to as IoT) has gradually been widely used in more fields, including logistics, security, home furnishing, and medical treatment. However, due to the limitation of space environment and geographical factors, terrestrial IoT cannot effectively solve all problems. In remote areas where humans cannot reach, it is very difficult to deploy base stations and establish communication networks. Compared with the ground mobile cellular communication network, the satellite communication system with wider coverage has become a new direction for the development of Internet of Things technology. Although the sat...

AI Technical Summary

Problems solved by technology

Although the satellite Internet of Things, as a supplement to the terrestrial Internet of Things, can cover areas that are difficult to cover with the terrestrial Internet of Things, it also faces many difficulties.

First of all, the satellite communication system itself faces the characteristics of extended transmission time and high dynamics of network nodes. Therefore, compared with the terrestrial cellular Internet of Things, the satellite Internet of Things is not suitable for delay-sensitive services; secondly, with the development of technology, The number of end users accessing the satellite Internet of Things system is increasing, the randomness is becoming stronger, and the business types are becoming more and more complicated

Random access of a large number of terminal devices and large-scale service requests can easily lead to network congestion

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