A data transmission method in a cognitive radio network

Abstract

The invention provides a data transmission method in a cognitive radio network, which comprises the following steps: in an initialized subframe, enabling all k secondary users to report the perception results, setting an ordinary subframe number into 1 in a data fusion center, determining to enable an optimal secondary user to report a set Omega according to the perception results reported by all the k secondary users, judging whether a main user exists or not and enabling all the k secondary users to carry out data transmission if the main user exists; and in an ordinary subframe, enabling the secondary users in the set omega reported by the optimal secondary user to report the perception results, judging whether the main user exists or not in the data fusion center according to the perception results reported by the secondary users in the set omega reported by the optimal secondary user and enabling all the k secondary users to carry out data transmission if the main user does not exist. By applying the invention, on the premise that the main user is not disturbed, the report signaling cost is reduced, so that the throughout capacity of the secondary users in the cognitive radio network is improved.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a data transmission method in a cognitive radio network. Background technique [0002] With the rapid development of broadband wireless communication technology, the demand for various ubiquitous wireless services in future communication networks is increasing, and the scarcity of wireless spectrum resources has become an urgent problem in the wireless communication field. In recent years, the academia has proposed cognitive radio (CR, cognitive radio) technology to enable secondary users (SU, secondary users) to access idle frequency bands (also called spectrum holes) to improve the scarcity of spectrum resources. The secondary users refer to users who are not legally authorized for certain wireless spectrums. [0003] Wherein, a spectrum hole is defined as an authorized frequency band that is not used by a primary user (PU, primary user) in a specific time...

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Problems solved by technology

[0005] However, the above three access methods all include an important process in cooperative spectrum sensing, that is, the process in which secondary users need to report sensing information to the data fusion center. Due to the large number of secondary users, many secondary The secondary users report the sensing information to the data fusion center at the same time, which will occupy a large time-frequency resource, that is, the actual reporting signaling overhead is relatively large, thereby reducing the achievable throughput of the secondary users in the cognitive radio network. Reporting signaling overhead represents the time-frequency resources occupied by secondary users when reporting sensing information

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