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Ariana, Tunisia

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. Source

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. Source

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. Source

Boussen S.,Research Unit MEDIATRON | Tabbane N.,Research Unit MEDIATRON | Arnaud J.,French National Center for Scientific Research | Krief F.,French National Center for Scientific Research
Proceedings of 2011 4th Joint IFIP Wireless and Mobile Networking Conference, WMNC 2011 | Year: 2011

In recent years, we have seen the emergence of realtime applications that have delay and reliability constraints. The challenge of the transport protocol is to provide a reliable service while reducing the delay. SCTP is a reliable transport protocol that have inherited the best characteristics of TCP and UDP and provided new attractive features such as multi-homing and multi-streaming. In this paper, we suggest the use of SCTP with the partial reliability extension as a transport protocol for the IPTV services in the IMS network, in order to improve the network performance and maximize the user satisfaction. Moreover, we have proposed an mSCTP based mobility scheme to guarantee service continuity during handover to IPTV users over IMS. © 2011 IEEE. Source

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. Source

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