University of Khartoum

A Proposed Model for Improving the Performance of Spectrum Handoff in Cognitive Radio Networks

A Proposed Model for Improving the Performance of Spectrum Handoff in Cognitive Radio Networks

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Title: A Proposed Model for Improving the Performance of Spectrum Handoff in Cognitive Radio Networks
Author: Mohammed, Ghada Abd Elraouf
Abstract: Cognitive Radio Networks (CRNs) have received tremendous attention from both academia and spectrum regulatory bodies in order to promote efficient spectrum utilization by allowing unlicensed users exploit the vacant frequency bands of the licensed spectrum. The concept of CRN has inspired innumerable research ideas and efforts to explore Dynamic Spectrum Access (DSA) strategies to provide satisfactory performance for both primary and secondary networks. Cognitive Radio (CR) has risen as an encouraging technology to improve spectrum efficiency and to solve the problem of spectrum scarcity. This is because CR allows the secondary (unlicensed) users to occupy unused licensed spectrum bands temporarily, given minimum interference with the primary (licensed) users. The thesis proposed a prioritized spectrum handoff scheme in a heterogeneous spectrum environment in order to improve the performance of CR networks. The handoff Secondary Users (SUs) have a higher priority relative to new SUs to occupy available spectrum channels in the licensed and unlicensed spectrum bands without interfering with the primary users (PUs). Queuing theory has been used to evaluate the performance of the proposed scheme and compare it with other existing schemes. The interrupted handoff probability and the handoff delay have mainly been used to investigate the impact of handoff on the performance of the proposed CR networks. Implemented model has shown an improvement in the adopted performance measures. The results of validation of the model reveals that the proposed model has improved on current average handoff delay and the number of handoff thus reducing the network congestion and the transmission overhead.
URI: http://khartoumspace.uofk.edu/123456789/27077


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