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Dive into the research topics where Leila Merghem-Boulahia is active.

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Featured researches published by Leila Merghem-Boulahia.


international conference on telecommunications | 2010

A Cooperative Multiagent Based Spectrum Sharing

Usama Mir; Leila Merghem-Boulahia; Dominique Gaïti

A major issue in recent wireless networks is the static utilization and allocation of the available spectrum. An effective solution to this problem is to detect the empty spectrum portions using cognitive radio devices and to share them with the neighboring users, in a dynamic and distributed manner. However, since nodes generally have limited knowledge about their environment, we suggest that cooperative behavior can provide them with the necessary information in order to solve the global issues. To this extend, we develop a novel approach for spectrum allocation using multiagent system cooperation that enables cognitive radio (or secondary user) devices to utilize the amount of available spectrum, dynamically and opportunistically. The key aspect of our design is the deployment of agents on each of the primary and secondary user devices that cooperate in order to have a better use of the spectrum. For cooperation, contract net protocol is considered, allowing spectrum to be dynamically allocated by having a series of exchange of messages amongst the devices. Simulation results show that our approach achieves up to 80% of the whole utility within the span of few messages, and provides an effective mechanism for distributed spectrum allocation.


Computer Networks | 2013

Crisis management using MAS-based wireless sensor networks

Ahmad Sardouk; Majdi Mansouri; Leila Merghem-Boulahia; Dominique Gaïti; Rana Rahim-Amoud

Wireless communication is increasingly used to manage large-scale crises (e.g., natural disasters or a large-scale city fire). Communication has traditionally been based on cellular networks. However, real-life experience has proven that the base stations of these networks may collapse or become unreachable during a crisis. An incident commander must also know as much information as possible about the occurring events to control them quickly and efficiently. This paper thus proposes a crisis management approach that overcomes the problems encountered by the base stations and insures relevant, rich and real-time information about events. This approach is based on wireless sensor networks, which are distributed in nature with no need for infrastructure and could be deployed in dangerous and inaccessible zones to gather information. Our proposal uses a multi-agent system as a software layer. The multi-agent system aims to improve the wireless sensor network performance by allowing cooperation between sensor nodes, offering better lifetime management and virtualizing the application layer. This virtualization supports several required applications simultaneously, including event monitoring and object tracking. Through successive simulations, we prove the importance of our approach in crisis management using several criteria to estimate the positions error in object tracking, end-to-end delay and wireless sensor network lifetime management.


Eurasip Journal on Wireless Communications and Networking | 2013

Admission control in wireless ad hoc networks: a survey

Lyes Khoukhi; Hakim Badis; Leila Merghem-Boulahia; Moez Esseghir

Wireless mobile ad hoc networks (MANETs) have emerged as a key technology for next-generation wireless networking. Because of their advantages over other wireless networks, MANETs are undergoing rapid progress and inspiring numerous applications. However, many technical issues are still facing the deployment of this technology, and one of the most challenging aspects is the quality of service (QoS) provisioning for multimedia real-time applications. MANETs are expected to offer a diverse range of services to support real-time traffic and conventional data in an integrated fashion. Because of the diversified QoS requirements of these services, QoS models are needed for an efficient usage of network resources. One of the most crucial mechanisms for providing QoS support is admission control (AC). AC has the task of estimating the state of networks resources and thereby to decide which application data flows can be admitted without promising more resources than are available and thus violating previously made guarantees. In order to provide a better understanding of the AC research challenges in MANETs, this paper presents a detailed investigation of current state-of-the-art AC models in ad hoc networks. A brief outline of the admission function, feedback to route failures, as well as the advantages and drawbacks of each discussed model are given.


wireless and mobile computing, networking and communications | 2011

A continuous time Markov model for unlicensed spectrum access

Usama Mir; Leila Merghem-Boulahia; Moez Esseghir; Dominique Gaïti

Recent static spectrum allocations have created an opportunity to develop novel solutions that can efficiently share the available spectrum both in licensed and unlicensed bands. Considering the relative rarity of solutions for unlicensed spectrum access, in this paper, we propose a scheme, where the cognitive radio (CR) devices (equipped with agents) interact with their neighbors to form several coalitions over the unlicensed bands. These types of coalitions can provide a less-conflicted spectrum access as the agents mutually agree for spectrum sharing. Further, we present a continuous time Markov chain (CTMC) with queuing to model the user interactions with the movement of spectrum access process from one state to another and derive the important performance metric as the blocking probability. Numerical results are presented to observe the impact of forming multiple coalitions on the blocking probability.


global information infrastructure and networking symposium | 2011

A cooperative aggregation-based architecture for vehicle-to-grid communications

Natalie Matta; Rana Rahim-Amoud; Leila Merghem-Boulahia; A. Jrad

In the future Intelligent Transportation Systems, vehicles will be equipped with special units giving them the capacity to communicate wirelessly. Furthermore, electric vehicles are expected to take a bigger part of the market in the future. Global preoccupations to reduce carbon emissions and stimulate the use of renewable and sustainable energies have motivated the concept of vehicle-to-grid power, which integrates the electric vehicles within the smart grid (the electricity network of the future). The vehicle-to-grid vision aims to take advantage of these battery equipped vehicles, using them as a storage device for intermittent energy sources, and as a power resource to provide ancillary services to the power grid. This paper focuses on the architectural needs of such a system, specifically at the communications level. It also presents an agent-based model for an aggregative system for vehicle-to-grid communications. The agent-based approach will allow the distributed architecture to benefit from a variety of well-established communication and cooperation mechanisms and methods that can be applied to the vehicle-to-grid concept.


Annales Des Télécommunications | 2011

An intelligent agent-based scheme for vertical handover management across heterogeneous networks

Atiq Ahmed; Leila Merghem-Boulahia; Dominique Gaïti

Advances in technology have enabled a proliferation of mobile devices and a broad spectrum of novel and outbreaking solutions for new applications and services. The increasing demand for all time and everywhere services requires the network operators to integrate different kinds of wireless and cellular networks. To enable this integration, it is important that users can roam freely across networks. As different technologies are involved in the current infrastructure, the problem of vertical handover needs to be addressed. To cope with the problem of seamless connectivity, several solutions have been presented. But most of them either lack intelligence or are not adaptable for reducing the packet loss and delay involved in the handover procedure. An intelligent technique is needed in order to perform the service continuity in the heterogeneous environment. This paper presents a cooperative agent based approach for the vertical handover using a knowledge plane. We propose to introduce the agents in the mobile nodes and access points to collect the necessary information from the environment. Based on this information, agents take a handover decision. A selection function is also introduced in this work which helps in choosing a best network from the available ones for handover. Finally, the proposed approach is validated with the help of simulations.


practical applications of agents and multi agent systems | 2010

Multiagent Based Spectrum Sharing Using Petri Nets

Usama Mir; Leila Merghem-Boulahia; Dominique Gaïti

This paper presents a cooperative framework for dynamic spectrum access in cognitive radio networks, where the cognitive radio devices may use the currently unutilized spectrum dynamically and opportunistically. The proposed solution works on the principle of multiagent system that allows the cooperation amongst several participating devices. The key aspect of our design is the deployment of agents on each of the primary and cognitive radio device that cooperates in order to have a better and dynamic use of the spectrum. For cooperation, contract net protocol is considered allowing spectrum to be dynamically allocated by having a series of exchange of messages. Due to the concurrent, distributed and autonomous nature of our approach, Petri nets are adopted to model the behavior of cooperative framework. Based on Petri nets, we study the internal message passing and spectrum allocation mechanism between the participating primary and cognitive radio users and identify the information needed by the agents to make cooperative decisions. Then, using empirical results, we show that our approach achieves up to 80% of the whole utility within the span of few messages, and provides an effective mechanism for distributed spectrum allocation.


international conference on telecommunications | 2010

Cooperative Agent Based Vertical Handover Scheme for Heterogeneous Networks

Atiq Ahmed; Leila Merghem-Boulahia; Dominique Gaïti

The increasing demand for all time and every where services requires the network operators to integrate different kinds of wireless and cellular networks. To enable this integration, it is important that users can roam freely across networks. But, as different technologies are involved, the problem of vertical handover (VHO) needs to be addressed. Solutions in the literature lack intelligence and are not adaptable for reducing the packet loss and latency involved in the handover. An intelligent technique is needed in order to perform the service continuity. This paper presents a cooperative agent based approach for the VHO. We propose to introduce the agents in the mobile nodes (MNs) and Access Points (APs) to collect the necessary information from the environment. Based on this information, agents will anticipate the handover in order to reduce the handover latency and packet loss. We have defined three behaviors for the agents that will assist us in performing this task.


modelling autonomic communications environments | 2009

Utilization of a Cooperative Multiagent System in the Context of Cognitive Radio Networks

Usama Mir; Leila Merghem-Boulahia; Dominique Gaïti

In this paper we propose an approach to solve the spectrum allocation/sharing problem using Multiagent System (MAS) cooperation that enables Cognitive Radio (CR) devices to share the unutilized spectrum dynamically and opportunistically. We introduce briefly the problem of static spectrum assignment and propose an approach to solve this issue. The key aspect of our design is the deployment of agents on each of the CR and Primary User (PU) devices that cooperate in order to have a better use of the spectrum. An example scenario is also presented along with our proposed model.


practical applications of agents and multi agent systems | 2015

An Agent-Based Approach for Energy Management in Smart-Grids

Joelle Klaimi; Rana Rahim-Amoud; Leila Merghem-Boulahia; A. Jrad

The advances in Information and Communication Technologies (ICT) permits interactions among the computational and the physical elements of the smart-grid, and provide opportunities for novel energy management techniques allowing thus renewable energy integration and energy price minimization. Few of the current energy management schemes integrate storage aspects. In this paper, we propose an agent-based algorithm for better energy management in the smart-grid using a storage system. Furthermore, we propose a negotiation algorithm to help consumer choose the appropriate producer which provides him the needed energy at the lowest price. Simulation results show that our proposal minimizes the energy costs for each energy demand and reduces conventional energy utilization.

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Dive into the Leila Merghem-Boulahia's collaboration.

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Dominique Gaïti

University of Technology of Troyes

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Moez Esseghir

University of Technology of Troyes

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Ahmad Sardouk

Centre national de la recherche scientifique

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Usama Mir

Centre national de la recherche scientifique

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Lyes Khoukhi

University of Technology of Troyes

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Natalie Matta

Centre national de la recherche scientifique

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Atiq Ahmed

Information Technology University

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