Analysis and optimization of a gated polling based spectrum allocation mechanismin cognitive radio networks

Shunfu Jin; Wuyi Yue; Zsolt Saffer

doi:10.3934/jimo.2016.12.687

Article Contents

2016, Volume 12, Issue 2: 687-702. Doi: 10.3934/jimo.2016.12.687

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Analysis and optimization of a gated polling based spectrum allocation mechanism in cognitive radio networks

1.
School of Information Science and Engineering, Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province, Yanshan University, Qinhuangdao 066004
2.
Department of Intelligence and Informatics, Konan University, Kobe 658-8501
3.
Department of Telecommunications, Budapest University of Technology and Economics, Budapest

Received: September 30, 2014

Revised: February 28, 2015

Published: March 2016

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Abstract

In Cognitive Radio Networks the licensed users and the cognitive users are called Primary Users and Secondary Users, respectively. The Primary Users enjoy preemptive priority during the spectrum usage, while the Secondary Users are allowed to access the unused parts of the spectrum opportunistically. In this paper we focus on the problem of improving the fairness of spectrum usage for real-time applications. We propose a novel centralized spectrum allocation mechanism with a gated polling strategy, which we model by a gated polling system with a non-zero switchover times. The approximate analysis of this polling model is performed. We derive formulas for estimating the system measures in terms of throughput of the system, average latency and delay jitter of the Secondary Users packets as well as the spectrum switching ratio and the spectrum utility. Numerical results based on the analysis and the simulation are provided to validate the analytical results and to investigate the impact of different parameters on the system performance. Finally we discuss the optimal system design by the help of building an appropriate cost function.

Keywords:

Mathematics Subject Classification: Primary: 68M10, 68M20; Secondary: 60J10.

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