Cross-layer cognitive radio network user access method based on frequency hopping

Abstract

The invention provides a cross-layer cognitive radio network user access method based on frequency hopping, and belongs to the field of application of radio networks. According to the method, cognitive users in primary user network is divided into a plurality of clusters according to the cognitive base station service range; each cluster comprises a cognitive base station (cluster head) and a plurality of cognitive users (cluster nodes); the cognitive base station is connected with a primary user base station and is managed by the user base station; however, the communications of cognitive users are controlled and managed by the cognitive base station. Based on the fact that corresponding idle spectrum information is obtained through monitoring a primary user on the network physical layer and sensing the spectrum, a plurality of frequency hopping patterns are generated by using a frequency hopping technology, and the cognitive users are made to carry out hopping communications between a plurality of signal channels as per certain frequency hopping pattern within different frequency ranges at different time on the MAC (Media Access Control) layer, so that the cognitive user dynamic access is achieved. The invention has the excellent effects of small network expense, high utilization ratio of spectrum, small interference and flexible and efficient user access manner.

Description

technical field [0001] The present invention relates to the technical field of wireless network communication, in particular to an implementation method for connecting multiple different users to a cognitive radio network. Background technique [0002] At present, with the increasing demand for wireless communication services, wireless spectrum resources are becoming increasingly scarce. In order to improve spectrum utilization, a new concept "spectrum holes" (Spectrum Holes) was proposed, that is, "a spectrum hole is allocated to authorized users However, at a specified time and space, this frequency band can be used by other users if the licensed user does not occupy this frequency band.” In this way, the potential utilization of spectrum resources can be significantly improved. Cognitive Radio (Cognitive Radio) technology is considered to be the main means to detect spectrum hole characteristics and efficiently utilize wireless spectrum in the future. Cognitive radio net...

AI Technical Summary

Problems solved by technology

However, due to the dynamic variability of the spectrum, the primary user may appear at any time, and once the primary user appears, the secondary user must immediately take back-off measures. If the secondary user frequently backs off, it will not only cause interference to the primary user in a short time, And it will affect the QoS (Quality of Service) of secondary users, thereby reducing the communication quality of the entire network

In addition, the cognitive radio network user access technology proposed in the existing research is mainly based on the adaptive method of MAC layer reservation and conflict avoidance, which does not fully consider the sharing of underlying monitoring information, resulting in high network overhead and low efficiency.

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