A dynamic allocation method of low-orbit satellite Internet of Things channel resources based on sdn

Abstract

The present invention provides an SDN-based low-orbit satellite Internet of Things channel resource dynamic allocation method. The access matching flow table calculation step calculates the sub-satellite point position of each satellite and the geographical grid where the satellite Internet of Things terminal is located through the ground controller. Judging which satellite the terminal should choose for access; the satellite channel resource dynamic allocation step uses the satellite controller to calculate the QoS level, quantity, minimum access success rate limit and satellite available resources of the access terminal service, and dynamically divides the channel Resources: the random access step assisted by access control performs contention random access according to the channel resources allocated to the terminal. Based on the SDN architecture, the method optimizes channel resource allocation through the ground controller and satellite controller, while ensuring that the success rate of medium and low priority services accessing the channel is not lower than the specified threshold, and maximizing high priority services. The access success rate is high to ensure the access performance of services with different priorities.

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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