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Boussen S.,Research Unit MEDIATRON | Tabbane N.,Research Unit MEDIATRON | Tabbane S.,Research Unit MEDIATRON | Krief F.,French National Center for Scientific Research
4th International Conference on Communications and Networking, ComNet 2014 - Proceedings | Year: 2014

In next generation networks, the availability of different wireless access networks in combination with the evolution of mobile terminals with multiple access interfaces makes the handover decision problem an important issue to study in order to improve the vertical handover process. To allowing the best connectivity to applications anywhere at any time, many vertical handover decision strategies have been proposed in the literature. In this paper, we present an overview of the most representative and recent strategies. We also compare them. Finally, we introduce our context aware vertical handover decision approach based on both quality of service and energy-efficiency criteria. © 2014 IEEE.


Fourati S.,Research Unit MEDIATRON | Hamouda S.,Research Unit MEDIATRON | Tabbane S.,Research Unit MEDIATRON
IEEE Vehicular Technology Conference | Year: 2011

The Cognitive Radio (CR) is a recent technology that aims at increasing the spectrum utilization under the current static spectrum management. With appropriate CR MAC protocols, the unlicensed users, also called secondary users (SUs), are able to access the unused portion of spectrum in an opportunistic way. These protocols should also provide a coordinated access between the SUs and protect the licensed users (or primary users, PUs) from the induced interference. In this paper, we propose a novel multi-channel cognitive MAC protocol based on a cooperative spectrum access among the SUs, which enhances the throughput of the cognitive radio network (CRN) subject to a SU transmit power constraint. Our proposed protocol introduces a new reactive sensing period and a novel recovery scheme to instantly detect the presence of a PU, and proposes an adaptive handoff to preserve the continuity of the SU transmission. The results of simulation show the effectiveness of our protocol. The aggregate throughput of the SUs is improved and the handoff delay is considerably reduced. © 2011 IEEE.


Hamouda S.,Research Unit Mediatron | Hamdaoui B.,Oregon State University
International Journal of Autonomous and Adaptive Communications Systems | Year: 2012

The next generation of radio wireless networks is expected to support spectrum decision operations that will allow a cognitive radio terminal to share the frequency bandwidth with primary users (PUs) without impairing their QoS requirements. This can indeed enhance the utilisation of the limited spectrum resources, and help meet the growing bandwidth demand. In this paper, we propose a new, cross-layer algorithm that allows a cognitive terminal (CT) to share and access to either HSDPA or WiMAX licensed spectrum while giving priority to the PUs. This algorithm not only considers the interference caused by the CT, but also enhances the achievable throughput of this CT. Simulation results show the effectiveness of our spectrum access scheme. Under our proposed scheme, the achievable data rate of the cognitive radio terminal is increased by 30% when compared with that obtained under common access schemes. Copyright © 2012 Inderscience Enterprises Ltd.


Thaalbi M.,Research Unit MEDIATRON | Tabbane N.,Research Unit MEDIATRON
Technological Developments in Networking, Education and Automation | Year: 2010

IEEE 802.21 is one of the emerged standards designed to build handover between heterogeneous technologies while optimizing session continuity. In this paper we provide a performance evaluation of the vertical handover between WiFi and WiMAX using IEEE802.21 for different traffic flows: VoIP, video streaming and FTP. The performance metrics used for this evaluation include throughput, end-to-end delay and packet loss rate. The performance evaluation is done using the Network Simulator NS2. © Springer Science+Business Media B.V. 2010.


Mallat Y.,Research Unit MEDIATRON | Ayari A.,Research Unit MEDIATRON | Ayadi M.,Research Unit MEDIATRON
Journal of Convergence Information Technology | Year: 2011

To improve the efficiency of the transfer of data, a major evolution of the GSM standard is known as GPRS (General Packet Radio Service). In addition, to ensure the proper functioning of these networks and to meet the needs of customers, operators should concentrate on the supervision of the quality of its service network. This supervision is essentially guaranteed through measures which are used to calculate performance indicators (KPI). These indicators reflect the level of satisfaction of the client. KPIs can then be calculated from two sources of data that are the drive test and the OMC. In this article, we are concentrating on the second case. The major problem in our study is the large volume of data to be treated. The idea of this article is based on the application of intelligent methods as decision system support to authorize the calculation of KPIs and the evaluation of the state of the network.


Mallat Y.,Research Unit MEDIATRON | Ayadi M.,Research Unit MEDIATRON | Ayari A.,Research Unit MEDIATRON | Tabaane S.,Research Unit MEDIATRON
Proceedings - IEEE 30th International Conference on Advanced Information Networking and Applications Workshops, WAINA 2016 | Year: 2016

Cognitive radio (CR) technology plays a major rolein managing the spectrum resources and allocating themaccording to the requirements of the users. Few recent worksfocused on the problem of routing in cognitive networks. Werecommend an adaptation of on-demand routing since itsperformance has been proven to CRAHNs (Cognitive RadioAd Hoc Networks). As an example, we can find the CognitiveAd hoc On demand Distance Vector (CAODV). This protocolis based on AODV protocol. The main drawback of thisprotocol is that it doesn't support the degree of influence of theQuality of Service (QoS) parameters on the user perception. Then, a novel routing metric should be defined to optimize theuse of QoS mechanisms in relation to the user's Quality ofExperience (QoE) in the routing mechanisms. In this paper, wepropose to develop and implement a new protocol, calledQoS/QoE-CAODV, that integrate the QoS and QoE adaptionmechanisms in cognitive on demand routing protocol. Theperformances of QoS/QoE-CAODV protocol have beenevaluated by numerical simulations (OPNET 14.5). We haveobserved from results that the QoS/QoE-CAODV protocolprovides better performance in term of MOS (Mean OpinionScore), end-to-end delay, Delay variations and jitter parameters. © 2016 IEEE.


Mallat Y.,Research Unit MEDIATRON | Ayari A.,Research Unit MEDIATRON | Ayadi M.,Research Unit MEDIATRON | Tabaane S.,Research Unit MEDIATRON
2015 23rd International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2015 | Year: 2015

A large number of routing protocols for Cognitive Radio (CR) have been recently proposed to improve the efficiency of spectrum utilization. As an example, we can find the Cognitive Ad hoc On demand Distance Vector (CAODV). This protocol is based on AODV one and uses an on-demand approach for finding routes to which the principals of regions activity avoidance of the Primary User (PU) has been added during the packet transfer. The main drawback of this protocol is that it doesn't support the Quality of Service (QoS) mechanisms. In this paper, we propose to develop, implement and test a new protocol that integrate the QoS adaption mechanism in cognitive on demand routing protocol. The new protocol, called QoS-CAODV, is a combination of QoS-AODV and CAODV. The performances of QoS-CAODV protocol have been evaluated by numerical simulations (OPNET 14.5). We have observed from results that the QoS-CAODV protocol provides better performance in term of average throughput, end-to-end delay and gives the smallest number of dropped packets. © 2015 University of Split, FESB.


Chalouf M.A.,University of Bordeaux 1 | Krief F.,University of Bordeaux 1 | Boussen S.,Research Unit MEDIATRON
2010 IEEE-RIVF International Conference on Computing and Communication Technologies: Research, Innovation and Vision for the Future, RIVF 2010 | Year: 2010

SCTP is a transport protocol which provides new interesting features such as multi-homing and multi-streaming. To support the multi-homing characteristic of SCTP, the service level negotiation protocols have to be updated. In this paper, we propose an extension of the Service Level Negotiation Protocol (SLNP) in order to enable service offer negotiation for SCTP-based applications. We propose also a new component called XMLL, which was added at the negotiation layer, situated in user's terminal, in order to accelerate handovers and optimize mobility management for mobile users. ©2010 IEEE.


Yosra M.,Research Unit Mediatron | Mohamed A.,Research Unit Mediatron | Sami T.,Research Unit Mediatron
2nd International Conference on Advanced Technologies for Signal and Image Processing, ATSIP 2016 | Year: 2016

To have a successful communication in Ad Hoc networks, Cognitive Radio (CR) can funding a flexible utilization of wireless radio spectrums. Routing Protocol is a significant problem in CRNs. Some routing protocol is based on different scenarios and it should incorporate QoS parameters in route definition to support QoS performance. Some revisions are done to the Cognitive Radio Ad Hoc network (CRAHN) protocols to satisfy QoS challenges such us bandwidth, delay, Packet delivery Ratio. So, we propose to develop some Cognitive Routing Protocols that integrate the QoS mechanisms. The performance of our work is calculated by simulations (OPNET 14.5 simulator). The results show that the QoS Cognitive Routing Protocols improved performance in term of delay, Route Discovery Time and throughput. © 2016 IEEE.


Ben Chaabane I.,Research Unit MEDIATRON | Hamouda S.,Research Unit MEDIATRON | Tabbane S.,Research Unit MEDIATRON
2012 IEEE Wireless Communications and Networking Conference Workshops, WCNCW 2012 | Year: 2012

Deploying decode-and-forward relay nodes is a promising solution for LTE-advanced networks in order to meet the growing data rate demand and the challenging requirements for coverage extension. However, relay selection scheme plays a crucial role in enhancing the benefit of this technology. In this paper, we have proposed a new relay selection scheme which achieves a more balanced load in the network, respects the user's quality of service requirements, but more importantly, avoids recurrent handovers and reduces the transmission delay. Simulation results proved a significant enhancement of the system performance in terms of outage probability, total system throughput and delay as compared to common relay selection strategies. © 2012 IEEE.

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