Frequency spectrum access method using idle channel in cognitive radio network

Abstract

The invention provides a frequency spectrum access method using communication of a selected idle authorized channel in a cognitive radio network. The method comprises the following steps: periodically perceiving a plurality of authorized channels and recording channel states which comprise a busy / idle state, utilization rate and waiting time by using each secondary (non-authorized) user in the cognitive radio network; and interacting control frames by the secondary users at transceiving two ends, calculating the maximum time that the secondary users can be accessed to the idle channels according to the utilization rate of the idle channels in the current network, selecting the idle authorized channel capable of transmitting maximum traffic, and performing communication between the secondary users on the selected channel. The method can solve the problems of a 'hidden' terminal and an 'exposed' terminal at the same time.

Description

A Spectrum Access Method Utilizing Idle Channels in Cognitive Radio Networks technical field The invention belongs to a spectrum access method in the technical field of wireless network communication, in particular to a cognitive radio spectrum access method using selected idle authorized channels for communication. vacant licensed channels, and utilize the spectrum access method of the selected selected vacant licensed channels. Background technique With the advent of the information age, wireless communication has developed rapidly, and people's requirements for service quality and data rate have been continuously improved. In the future, the available wireless resources will become increasingly scarce, and the scarcity of spectrum has become a serious problem. The lack of spectrum resources is more caused by the unreasonable utilization of wireless access technologies. The current spectrum allocation method is mainly based on a fixed allocation method, that is, a certa...

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Problems solved by technology

The existing spectrum access methods of wireless systems cannot be used in cognitive radio systems, mainly because: (1) traditional spectrum access methods do not need to consider interference to licensed users; (2) traditional spectrum access algorithms It is difficult to adjust in real time, and cannot meet the high flexibility and real-time requirements of the cognitive radio system; (3) The traditional spectrum access algorithm only considers the access of a single spectrum, and cannot adapt to the discrete spectrum access requirements of the cognitive radio system

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