Adjustable channel intersection method based on finite cover in cognitive wireless network

Abstract

The invention discloses an adjustable channel intersection method based on finite cover in a cognitive wireless network (CRN). An adjustable non-crossing finite cover channel intersection algorithm for time asynchronization, model heterogeneity, role symmetry and user information anonymity is acquired by use of non-crossing finite cover. A relationship is established between the channel intersection process of the CRN and non-crossing finite cover, wherein each cover in DFC represents one channel, each element in the cover represents a time slice in a CH frequency-modulated sequence, and the unique element in each cover represents the channel represented by the cover searched in the time slice represented by the element. The generated DFC is a function LOCK of network scale. The diverse requirements of the network can be satisfied by changing the size of LOCK. Simulation results show that ADFC-CH has better performance than other algorithms (SSB, L-DDP and DSCR).

Description

technical field [0001] The invention belongs to the technical field of cognitive wireless networks, and in particular relates to an adjustable channel rendezvous method based on limited coverage in a cognitive wireless network. Background technique [0002] With the popularization of wireless devices, the number of wireless devices is increasing day by day, resulting in the shortage of spectrum resources for unlicensed users, so a series of problems such as congestion, delay, and low reliability appear. At the same time, the spectrum resources of authorized users are not fully utilized. In order to solve this problem, the Federal Communications Commission of the United States proposed the technology of cognitive radio and proposed dynamic spectrum access. A cognitive radio network (CRN) consists of authorized primary users (PU) and unlicensed secondary users (SU). The core idea of ​​this network is to allocate idle PU spectrum resources to SU reasonably, so as to solve a s...

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Problems solved by technology

[0005] The purpose of the present invention is to provide an adjustable channel rendezvous method based on limited coverage in a cognitive wireless network, aiming to solve the saturation problem and congestion attack problem caused by a single control channel in the existing channel rendezvous strategy; Issues such as user allocation of authorized channels, reasonable channel utilization of SUs, avoidance of conflicts between SUs, increase of user rendezvous, and minimization of MTTR

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