Link establishment method by taking user as center in cognitive radio scene

Abstract

The invention discloses a link establishment method by taking a user as a center in a cognitive radio scene, and belongs to the technical field of wireless communication. In a system taking the user as the center, the user can freely select a seller having available channels, so call blocking can be generated unless all sellers are overloaded. Therefore, the call blocking rate is reduced, and the spectral efficiency is improved. The method comprises three steps of initial spectrum environment sensing, optimal seller locking, and stabilization of transceiving spectral masks. In the initial spectrum environment sensing, an MS scans BS beacons, a seller of which the link quality meets the requirement is selected, a request is sent, and a seller model and a related loss function are established; in the optimal seller locking, the optimal seller is selected in the established model basin, the MS sends a locking request to an MRC, the MRC sends locking information to the selected seller, and an initial link is established between the MS and the seller BS; and in the stabilization of transceiving spectral masks, the difference between the transceiving spectral masks is reduced by exchanging spectrum detecting results between the MS and the BS, a stable link is established, and the BS provides communication service for the MS in the update time T. The invention introduces the thought of taking the user as the center, and can effectively reduce the call blocking rate and improve the spectral efficiency.

Description

A User-Centric Link Establishment Method in Cognitive Radio Scenario technical field The invention relates to a method for establishing a link in a user-centered wireless system in a cognitive radio scenario, and belongs to the field of wireless communication technology, in particular to cognitive radio technology (CognitiveRadio, CR, S. Haykin, "CognitiveRadio: Brain -Empowered Wireless Communications," IEEE JSAC, Feb. 2005, vol. 23, no 2, pp. 201-220). Background technique CR technology has become one of the most attractive technologies to improve the spectrum utilization efficiency. Research on improving the performance of wireless systems based on CR technology has also made a lot of progress. In the traditional wireless communication system, the seller-centric system is adopted, that is, the user obeys the service provider (seller), and always uses the frequency spectrum allocated by the seller to establish a link for communication. Vendor-centric systems have lower...

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Problems solved by technology

In the traditional wireless communication system, the seller is the center, resulting in insufficient spectrum utilization, and due to the difference in the electromagnetic environment at the two ends of the link, the available wireless spectrum at the transceiver end is not completely consistent, resulting in spectrum The utilization rate is not high, the mutual interference between users and the problem of link quality degradation

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