Communication, Tunisia
Communication, Tunisia

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El-Bessi S.,Laboratory MEDIATRON | Hamouda S.,Laboratory MEDIATRON | Tabbane S.,Laboratory MEDIATRON
IEEE Vehicular Technology Conference | Year: 2013

In Cognitive Radio Networks (CRN), Secondary Users (SUs) can access the spectrum simultaneously with the Primary Users (PUs) in underlay mode. In this case, interference caused to the licensed users has to be effectively controlled. The SUs have to make spectrum access decisions in order to enhance their quality of service, but without causing harmful interference to the coexisting PUs. In this paper, we propose a cooperative spectrum decision which enables the SUs to share the spectrum with the PUs more efficiently. Our approach is based on a new coalitional game in which the coalition value is a function of the SUs' spectral efficiencies, the inter-SUs interference and the interference caused to the PUs. By applying new Enter and Leave rules, we obtain a stable coalition structure. Simulation results show that the SUs' spectral efficiencies are considerably increased and that the interference caused to the coexisting PU is reduced by about 7.5% as compared to an opportunistic spectrum access scheme. Moreover, the proposed coalitional game results in a more balanced spectrum sharing in the network. Copyright © 2013 by the Institute of Electrical and Electronic Engineers, Inc.


Ben Chaabane I.,Laboratory MEDIATRON | Hamouda S.,Laboratory MEDIATRON | Tabbane S.,Laboratory MEDIATRON | Vicario J.L.,Autonomous University of Barcelona
IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC | Year: 2012

Relaying is a promising technique for the next generation cellular networks. It is highly recommended in the 3GPP LTE-Advanced because it is expected to satisfy the ever growing capacity and coverage demands in a cost-efficient way. Yet, in order to fully exploit the benefits of relaying, we should examine the radio resource allocation between the eNB and the relay nodes. In this paper, we propose a dynamic Physical Resource Blocks (PRBs) allocation scheme in a dual-hop LTE-advanced by using game theory. We define a new repeated game in which a selfish node can achieve cooperative spectrum opportunities sharing under the threat of punishment. Simulation results show that the proposed scheme significantly improves the spectrum utilization and total achieved throughput in the system. We also demonstrate that the game rapidly attain Pareto-efficiency. © 2012 IEEE.


Hamouda S.,Laboratory MEDIATRON | Bennour Z.,Laboratory MEDIATRON | Tabbane S.,Laboratory MEDIATRON | Morell A.,Autonomous University of Barcelona
IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC | Year: 2012

Femtocells are new devices that are recently developed to address the poor indoor coverage of the 3G cellular network and beyond. This solution may, however, cause significant interference in the system. In our paper, we propose a new approach based on game theory which aims at enhancing the femtocells' capacity in a HSDPA network while mitigating the interference impact on the macro users' quality of service. We propose a non-cooperative supermodular power control game in which we define a new utility function under total transmit power constraint, but also under macro user throughput constraint. We prove the existence of the Nash Equilibrium analytically and by means of simulations. Simulation results also showed that the macro users' data rates can be improved by 15% as compared to the case of a common femtocells deployment. © 2012 IEEE.

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