Wireless access method and system in cognitive wireless network

Abstract

The invention relates to a wireless access method and system in a cognitive wireless network. Wireless access of a cognitive user terminal is assisted by utilizing a cognitive pilot channel in the cognitive wireless network. The wireless access method comprises an access method which is to access the cognitive user terminal to an idle frequency point of an authoring system, and a spectrum switching method which is triggered when a main user occurs or the service quality of a cognitive user drops to a certain threshold value. According to the invention, the communication process of the cognitive user is mainly considered, and the communication process includes an initial access process after the cognitive terminal is started up, a network environment information obtaining way, conceding and switching when the main user occurs, spectrum switching caused by reduction of communication quality, and the like; in the communication process, the cognitive pilot channel is utilized to obtain the spectrum information of the environment and help the terminal to find the network and access to the spectrum rapidly, so that operations of the cognitive terminal for scanning and sensing a large-scale spectrum are avoided, and the process of accessing the cognitive terminal to the network rapidly is realized.

Description

technical field [0001] The present invention relates to a wireless network, in particular to a wireless access method and system in a cognitive wireless network, and in particular to a method for assisting wireless access in a cognitive wireless network by using a cognitive pilot channel, that is, a cognitive pilot channel and system. Background technique [0002] In recent years, cognitive wireless networks have received attention from all walks of life. Cognitive wireless networks are composed of licensed systems and unlicensed systems. The licensed system refers to the communication system authorized by the spectrum management agency to use a certain spectrum, and the communication of the licensed system is not interfered by other systems. The utilization rate of the frequency band occupied by the system is not very high, and there are often idle frequency bands; an unlicensed system refers to a communication system that operates on an unlicensed spectrum or a cognitivel...

AI Technical Summary

Problems solved by technology

[0011] 1. The communication between the cognitive user and the idle frequency point of the authorization system in the cognitive network should include the initial network access process at the beginning, the way to obtain network environment information, the concession when the main user appears, and the frequency point switching when the communication quality drops For the complete communication process, in Patent Document 1 and Patent Document 2, only the initial access between the terminal and the network can be considered; in Patent Document 3 and Patent Document 4, only the spectrum switching between the terminal and the network is considered, and there is no Describe the communication process of a complete cognitive user

[0012] 2. As described in Patent Document 1, when multiple users make initialization requests, each user is assigned different cognitive pilot dedicated resources and different uplink access channels. This method is not easy to ensure the smooth operation of cognitive users.

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