Opportunity spectrum access method under limited energy condition

Abstract

The invention discloses an opportunity spectrum access method under the condition of limited energy. The method comprises the following steps: establishing a perception access energy consumption channel model; checking residual energy of the cognitive user, and determining a channel set to be perceived; sensing the channels to obtain a sensing idle channel set; enabling the secondary user to access all channels which are perceived to be idle; and enabling the secondary user to update the channel statistical information and the energy information. The perceptual access energy consumption channel model established by the method is closer to reality, the problem is abstracted into an energy-limited multi-arm bandit model based on sequential decision and statistical learning theories, and a channel perceptual access strategy is provided by utilizing a knapsack problem in the optimization problem. Besides, the algorithm designed by the invention has a nonlinear relationship with the magnitude of the user energy in simulation and theory, which indicates that the larger the user energy is, the longer the sensing time is, the more the user can sense the access to a better channel, and better benefits can be obtained.

Description

technical field [0001] The invention relates to the technical field of wireless networks, in particular to an opportunistic spectrum access method under the condition of limited energy. Background technique [0002] Cognitive radio originated from the groundbreaking work of Dr. Joseph Mitola in 1999. Its core idea is that network users have the ability to learn and interact with the surrounding environment to perceive and utilize the available spectrum in the space and reduce the risk of conflict with other users. occur. More specifically, cognitive radio discovers parts of the radio spectrum that are not occupied at specific times at specific locations and shifts operations to these parts, known as "spectrum holes" (vacant spectrum), for opportunistic access. Therefore, cognitive radio has two main operations: spectrum sensing and spectrum access (information transfer). Spectrum sensing means that cognitive users obtain spectrum usage information in wireless networks thro...

AI Technical Summary

Problems solved by technology

However, the earlier methods mentioned above did not consider the energy-constrained situation

[0005] Therefore, there is still a lack of effective method design research for channel-aware access when channel statistics are unknown and secondary user energy is limited.

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