132documents trouvés
Energy-efficient directional antenna model for wireless sensor networks
E.ALBU, T.GAYRAUD, Y.LABIT, P.BERTHOU
OLC
Rapport LAAS N°11093, Mars 2011, 8p.
Diffusable
124085Design of a multiple-interfaces synchronized energy-efficient architecture for wireless sensor networks
E.ALBU, T.GAYRAUD, P.BERTHOU, Y.LABIT
OLC
Rapport LAAS N°11091, Mars 2011, 7p.
Diffusable
124083A new wireless architecture for IFE systems inside aircraft cabin
A.AKL, T.GAYRAUD, P.BERTHOU
OLC
Revue Scientifique : International Journal on Advances in Networks and Services, Vol.4, N°1-2, pp.159-175, Janvier 2011 , N° 11077
Lien : http://hal.archives-ouvertes.fr/hal-00661029
Diffusable
Plus d'informations
Abstract
A primary difficulty when investigating communication requirements rises when a very specific field as an aircraft cabin is considered. The diverse needs of passengers are often incompatible to the strict constraints inside the cabin. Nowadays In-Flight Entertainment (IFE) systems, for instance, are widely spread in modern flights. An IFE system usually consists of a Seat Electronic Box, the passengers terminal hardware, plus a Passengers Control Unit, the remote control to select the service, and a Visual Display Unit, the screen. Using the wireless technology in these systems can increase the satisfaction level of both the passengers and the avionics companies. However, the inside of the cabin is not a flexible environment; reliability and safety are two mandatory requirements, so different constrains are imposed. This means that off-shelf technologies (hardware including antennas, network topology, network protocols and services) are usually not suitable for such environment. Consequently, a new architecture has to be designed and implemented. This paper aims at integrating heterogeneous available communication technologies, showing their pros and cons, within this context, while considering the imposed communication restrictions inside the aircrafts cabin. From that, a new wireless heterogeneous architecture is proposed. In addition, to be able to use such architecture, we propose a new protocol, which utilizes the smart antennas technology to allow Passenger Control Units to be recognized and configured autonomously without any external intervention.
QoS-enabled ANFIS dead reckoning algorithm for distributed interactive simulation
A.HAKIRI, P.BERTHOU, T.GAYRAUD
OLC
Manifestation avec acte : IEEE/ACM International Symposium on Distributed Simulation and Real Time Applications (DS-RT 2010), Faifax (USA), 17-20 Octobre 2010, pp.33-42 , N° 10522
Lien : http://hal.archives-ouvertes.fr/hal-00537501/fr/
Diffusable
Plus d'informations
Abstract
Dead Reckoning mechanisms are usually used to estimate the position of simulated entity in virtual environment. However, this technique often ignores available contextual information that may be influential to the state of an entity, sacrificing remote predictive accuracy in favor of low computational complexity. A novel extension of Dead Reckoning is suggested in this paper to increase the network availability and fulfill the required Quality of Service in large scale distributed simulation application. The proposed algorithm is referred to as ANFIS Dead Reckoning, which stands for Adaptive Neuro-based Fuzzy Inference System Dead Reckoning is based on a fuzzy inference system which is trained by the learning algorithm derived from the neuronal networks and fuzzy inference theory. The proposed mechanism takes its based on the optimization approach to calculate the error threshold violation in networking games. Our model shows it primary benefits especially in the decision making of the behavior of simulated entities and preserving the consistence of the simulation.
An energy-efficient clock synchronization protocol for wireless sensor networks
E.ALBU, Y.LABIT, T.GAYRAUD, P.BERTHOU
OLC
Manifestation avec acte : IFIP Wireless Days 2010, Venise (Italie), 20-22 Octobre 2010, 5p. , N° 10659
Lien : http://hal.archives-ouvertes.fr/hal-00544972/fr/
Diffusable
Plus d'informations
Abstract
The behavior of Wireless Sensor Networks (WSN) is nowadays widely analyzed. One of the most important issues is related to their energy consumption, as this has a major impact on the network lifetime. Another important application requirement is to ensure data sensing synchronization, which leads to additional energy consumption as a high number of messages is sent and received at each node. Our proposal consists in implementing a combined synchronization protocol based on the IEEE 1588 standard that was designed for wired networks and the PBS (Pairwise Broadcast Synchronization) protocol that was designed for sensor networks, as none of them is able to provide the needed synchronization accuracy for our application on its own. The main goals of our new synchronization protocol are: to ensure the accuracy of local clocks up to a tenth of a microsecond and to provide an important energy saving. Our results obtained using NS-2 (Network Simulator) show that the performance of our solution (IEEE 1588-PBS) matches our application requirements with regard to the synchronization, with a significant improvement in energy saving.
On the impact of monitoring router energy consumption for greening the internet
A.ADELIN, P.OWEZARSKI, T.GAYRAUD
OLC
Manifestation avec acte : IEEE/ACM International Conference on Grid Computing (Grid 2010), Bruxelles (Belgique), 25-29 Octobre 2010, pp.298-304 , N° 10489
Lien : http://hal.archives-ouvertes.fr/hal-00505509/fr/
Diffusable
122974Dynamic QoS configuration of a DVB-RCS satellite terminal for SIPbased applications
B.JACQUEMIN , P.BERTHOU, T.GAYRAUD, C.BAUDOIN
OLC, Thalès Alenia Space
Manifestation avec acte : 16th Ka Band Conference, Milan (Italie), 20-22 Octobre 2010, 8p. , N° 10656
Lien : http://hal.archives-ouvertes.fr/hal-00529000/fr/
Diffusable
Plus d'informations
Abstract
Satellite systems were long-dedicated mainly to broadcast services as television whereas Internet access was offered by terrestrial networks as DSL technologies. However, the democratization of DVB-S terminal, the standardization of a return channel via satellite (DVB-RCS) and the significant breakthroughs leading to DVB-S2 standard have allowed them to represent an interesting alternative to terrestrial networks in remote areas. But, to be competitive, DVB-S2/RCS systems have to offer an appropriate support to the variety of current and future multimedia applications (VoIP, videoconferencing) by providing QoS guarantees in spite of its specific characteristics: a long transmission delay and a limited bandwidth. In this context, this paper considers a DiffServ architecture, compliant with the SatLabs recommandations, in which three classes are considered at the IP layer to differentiate the traffic: EF, dedicated to real-time applications with strong time-constraints, AF used for non real-time applications and BE. Each Diffserv classe is mapped on a specific MAC queue to take benefit of the DAMA (Demand Assignment Multiple Access) mechanisms which allow the ST to dynamically request capacity to the NCC (Network Control Center). The goal of this work is to configure dynamically the DiffServ classes of service of the Linux-based ST for interactive applications, as VoIP, by using the session descriptors contained in SIP messages. For that, a complete QoS architecture based on the communication between an enhanced SIP proxy and a QoS Server and/or an ARC (Access Resource Controller) has been designed, developed and evaluated on a satellite network emulation testbed (PLATINE), implemented in the SatIP6 and SatSIX IST projects.
Investigating several wireless technologies to built an heterogeneous network for the In-Flight Entertainment system inside an aircraft cabin
A.AKL, T.GAYRAUD, P.BERTHOU
OLC
Manifestation avec acte : International Conference on Wireless and Mobile Communications (ICWMC 2010), Valence (Espagne), 20-25 Septembre 2010, pp.532-537 , N° 10419
Lien : http://hal.archives-ouvertes.fr/hal-00661013
Diffusable
Plus d'informations
Abstract
A primary difficulty when investigating communication requirements in an aircraft cabin is the diverse needs of passengers when compared to the strict constraints inside the cabin. It is recognized that there is an increasing need of passengers to use their electronic devices as well as the need for entertaining during the flight. This paper aims at integrating heterogeneous available communication technologies, showing their pros and cons -within this context while considering the imposed communication restrictions inside the aircraft's cabin.
Experience with monitoring electrical power consumed by routers
A.ADELIN, P.OWEZARSKI, T.GAYRAUD
OLC
Rapport LAAS N°10488, Août 2010, 5p.
Lien : http://hal.archives-ouvertes.fr/hal-00505510/fr/
Diffusable
122264Rapport de pré-étude des standards et de l'existant pour l'architecture et la plate-forme. Livrable L1.1 V0.7
H.AROUS, L.BERTAUX, K.DRIRA, T.GAYRAUD, T.VILLEMUR
OLC
Rapport de Contrat : Projet OSEO ISI: AMIC-TCP, Août 2010, 88p. , N° 10445
Non diffusable
122145