QoS-aware Routing for Real-Time and Multimedia Applications in Mobile Ad Hoc Networks

International audienceWith the increasing development of real-time and multimedia applications, there is a need to provide bandwidth and delay guarantees. Most of QoS ad hoc network routing protocols select path guaranteeing delay and/or bandwidth. However, they don't consider throughput optimization, which results in a low number of admitted real-time and multimedia flows. In this paper, we propose a cross-layer TDMA-based routing protocol to meet delay and bandwidth requirements while optimizing network throughput. Since in TDMA-based ad hoc networks, slot reservation impacts two-hops neighbors, our routing protocol selects paths with the lowest number of neighbors. To show the effectiveness of our protocol, we present simulations using NS-2

Preserving the Global Consistency of Dynamic Reconfiguration

International audienceMany component-based systems need to modify their behavior or structure at run time in order to adapt the continuous change of user requirements or working environments. Change management is an essential part of reconfigurable systems. Dynamic reconfiguration helps these systems to evolve incrementally for one configuration to another at execution time. Many approaches have been proposed to support dynamic reconfiguration in various kinds of systems. This paper introduces a new approach for preserving the global consistency of dynamic reconfiguration using Alloy specification language. Alloy is a powerful language for modeling and describing the structure and the behavior of a system by expressing its constraints. The approach starts by modeling the structure of a reconfigurable system, and then a set of predicates are proposed to describe the dynamic behavior of a reconfigurable system. Finally, an analysis is done to analyze the previous specifications using Alloy Analyze

Energy Optimization based on the Redundancy in WSNs

International audienceAlmost all WSNs (Wireless Sensor Networks) are deployed with some redundancy degree and redundancy is used only for robustness objectives. If not handled in an intelligent way, redundancy results in energy wasting because of (often unnecessary) redundant transmission and reception operations. We propose to take benefit from measurement redundancy to optimize the energy consumption and improve the end-to-end delay. We propose MR-LEACH (Measurement Redundancy aware LEACH) protocol, which is an extension to the well-known LEACH protocol to improve energy consumption in cluster-based WSNs. In addition to cluster formation according to LEACH protocol redundant nodes are grouped taking into account their redundancy and only a single node transmits data in each redundant group. This technique significantly improves the energy consumption and ensures a better end-to-end delay. Through intensive simulations, we discuss the performance of our approach and show how it outperforms the original LEACH protocol in terms of network lifetime and end-to-end delay

Telemedicine and e-health in Algeria facing challenges in medical practice

The Algerian health system operates in a demographic, economic, environmental, and societal specific context to meet the challenges of epidemiological transition. Development of information and communication technologies in this atmosphere allow telemedicine and e-health emergence in the vast country of Algeria. Thus, the country may face these challenges by including them in a national telemedicine plan and making a major focus of global action for the prevention and control of prevalent diseases. The interest to adopt this tool in daily practice stems from an improvement in the quality of communication between practitioners and in the doctor–patient relationship with a possibility of quick access to care and more efficient care pathways. Thus, national goals in fight plans against diseases will be achieved. Telemedicine and e-health projects that methodologically well-defined, respecting regulations and using all means and all available resources, including WHO mobile health, are to be designed and implemented in all areas, especially in the national plan against not-communicated diseases, maternal and child health, old aging health, and mental health. This approach will integrate telemedicine in the health care system whose inevitable implementation can be done on solid foundations and will be actively supported by SATeS

Multimedia CTI Services for Telecommunication Systems

Colloque avec actes et comité de lecture.Computer telephony combines telephone and computer technologies to allow information exchange. In telecommunication systems, CTI (Computer Telephony Integration) applications support multimedia contraints such as, the synchronization of audio and video flows in videoconference systems. This papers presents the CTI and our experience in developing CTI services for vocal server

CTI and Multimedia applications applied to intelligent networks

Colloque avec actes et comité de lecture.Computer telephony combines telephone and computer technologies to allow information exchange. This paper describe, the state of art of CTI (Computer Telephone Integration) and the architectures, past, present and futur to allow information exchance between the informatique and telecommunication domain

10th IEEE Workshop on Factory Communication Systems (WFCS 2014), Toulouse

International audienceno abstrac

Reinforcement Learning Based Routing in Networks: Review and Classification of Approaches

International audienceReinforcement learning (RL), which is a class of machine learning, provides a framework by which a system can learn from its previous interactions with its environment to efficiently select its actions in the future. RL has been used in a number of application fields, including game playing, robotics and control, networks, and telecommunications, for building autonomous systems that improve themselves with experience. It is commonly accepted that RL is suitable for solving optimization problems related to distributed systems in general and to routing in networks in particular. RL also has reasonable overhead—in terms of control packets, memory and computation—compared to other optimization techniques used to solve the same problems. Since the mid-1990s, over 60 protocols have been proposed, with major or minor contributions in the field of optimal route selection to convey packets in different types of communication networks under various user QoS requirements. This paper provides a comprehensive review of the literature on the topic. The review is structured in a way that shows how network characteristics and requirements were gradually considered over time. Classification criteria are proposed to present and qualitatively compare existing RL-based routing protocols