Papers by Thierry GAYRAUD
HAL (Le Centre pour la Communication Scientifique Directe), Aug 1, 2010
HAL (Le Centre pour la Communication Scientifique Directe), Dec 1, 2005
Full integration of satellite technology in future terrestrial infrastructures requires support f... more Full integration of satellite technology in future terrestrial infrastructures requires support for high-quality broadband bi-directional communications. Research efforts in the field of satellite communications are currently oriented in the study of QoS-aware solutions for DVB-S and DVB-RCS which allowed seamless deployment in the Internet. In this paper, the QoS architecture designed in the framework of the SATIP6 project, sponsored within the 5 th EU Research Programme Framework, is presented, along with the implemented demonstrator and the obtained results. The QoS architecture is organized into two main modules, the Traffic Control and Access Control modules, whose aims are (i) to provide for differentiated service of conveyed IP flows and (ii) to achieve efficient utilization of uplink bandwidth respectively. Experimental results obtained through the developed hardware demonstration platform are reported and discussed to assess the effectiveness of the designed solution in terms of both service differentiation and efficient utilization of satellite resources.
IFIP, 2005
, except for brief excerpts in connection with reviews or scholarly analysis. Use in connection w... more , except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now know or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks and similar terms, even if the are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.
There is rising interest in applying SDN principles to wireless multihop networks, as this paves ... more There is rising interest in applying SDN principles to wireless multihop networks, as this paves the way towards bringing the programmability and flexibility that is lacking in today's distributed wireless networks (ad-hoc, mesh or sensor networks) with the promising perspectives of better mitigating issues as scalability, mobility and interference management and supporting improved controlled QoS services. This paper investigates this latter aspect and proposes an Integer Linear Programming (ILP) based wireless resource allocation scheme for the provision of point-to-point and point-to-multipoint end-to-end virtual links with bandwidth requirements in softwaredefined multi-radio multi-channel wireless multi-hop networks. The proposed scheme considers the specificities of wireless communications: the broadcast nature of wireless links which can be leveraged for point-to-multipoint links resource allocations, and, the interference between surrounding wireless links. It also considers switching resource consumption of wireless nodes since, for the time being, the size of SDN forwarding tables remains quite limited. A Genetic Algorithm derived from the ILP formulation is also proposed to address the case of large wireless networks. Our simulation results show that both methods work effectively.
We present a topology discovery service for software-defined wireless multi-hop networks, which i... more We present a topology discovery service for software-defined wireless multi-hop networks, which is capable of capturing rich information about the network topology, such as link quality, interference and node characteristics etc., to effectively support the requirements of higher-layer SDN applications such as routing, channel allocation and transmission power control with enhanced flexibility. We analyse the general topology representation required by such SDN applications and specify the procedure and mechanism required at the controller and nodes to maintain this representation. A proof-of-concept implementation of our service on an SDN enabled multi-channel multi-interface wireless multi-hop network testbed shows the feasibility of our proposal.
HAL (Le Centre pour la Communication Scientifique Directe), Nov 10, 2013
Stimulées par la croissance de leur utilisation tant dans le domaine militaire que dans le domain... more Stimulées par la croissance de leur utilisation tant dans le domaine militaire que dans le domaine civil, les applications DDS connaissent une forte croissance dans les réseaux a large envergure. Cependant, certaines caractéristiques de ces réseaux comme les longs délais, la limitation de la bande passante et l'interdiction de l'utilisation de certains protocoles dans les réseaux opérationnels comme le multicast réseau, rendent difficile voire impossible la mise en place d'applications DDS. Nous présentons dans ce travail une proposition pour l'interconnexion d'applications DDS sur des réseaux distants : dans un premier temps, nous analysons la possibilité d'utiliser le service de routage de la couche middleware DDSà travers la mise en oeuvre d'un "pont-fédéré" DDS permettant d'interconnecter des domaines DDS distincts sur des réseauxétendus. Ensuite, nous proposons le concept de "Proxy DDS" qui en comparaison avec la solution précédente permet de réduire le volume de traficéchangé sur le réseau.
Sciyo eBooks, Aug 18, 2010
Thanks to technological advances in information and communications, Unmanned Aerial Vehicles (UAV... more Thanks to technological advances in information and communications, Unmanned Aerial Vehicles (UAVs) (aka drones) technology has become one of the most important service delivery inventions these days. Equipped with sensors and cameras, these technologies can perform much on-demand critical application ranging from military and environmental to rescue operations. These UAVs devices, sometimes tiny, that can replace human and manned aircraft in several tasks, have been utilized to perform various types of services and applications more efciently. However, the deployment side of such emerging technology is still facing many issues and challenges. Using multi-drones or swarm of drones, together to accomplish one operation is one of these recent challenges. Such a system requires a high level of delicacy and cooperation to achieve the required autonomy and reduce human interaction as possible. Communication is one of the biggest challenges in these systems, since the devices should keep exchanging various types of messages with different Quality of Service (QoS) requirements. In this paper, a collaborative autonomous system of swarm drones based on deep learning has been proposed and a testbed of cooperative UAVs' mission to validate the performance of the dedicated QoS communication system using Paparazzi drones The proposed system is aware of the drones' requirements in term of QoS and able to meet with their dynamic demands.
Computer Communications, Sep 1, 2019
There is rising interest in applying Software Defined Networking (SDN) principles to wireless mul... more There is rising interest in applying Software Defined Networking (SDN) principles to wireless multi-hop networks, as this paves the way towards bringing the programmability and flexibility that is lacking in today's distributed wireless networks (ad-hoc, mesh or sensor networks) with the promising perspectives of better mitigating issues such as scalability, mobility and interference management and supporting improved controlled QoS services. This paper investigates this latter aspect and proposes an Integer Linear Programming (ILP) based wireless resource allocation scheme for the provision of point-to-point and point-to-multipoint end-to-end virtual links with bandwidth requirements in softwaredefined multi-radio multi-channel wireless multi-hop networks. The proposed algorithm considers the peculiarities of wireless communications: the broadcast nature of wireless links which can be leveraged for point-to-multipoint links resource allocations, and, the interference between surrounding wireless links. It also considers switching resource consumption of wireless nodes since, for the time being, the size of SDN forwarding tables remains quite limited. We also consider the case where the requirements of already embedded virtual links evolve over time and propose a re-embedding strategy that meets the new requirements while minimizing service disruption. Genetic Algorithms derived from the ILP formulations are also proposed to address the case of large wireless networks. Our simulation results show that our proposed methods work effectively compared to shortest path based heuristics.
HAL (Le Centre pour la Communication Scientifique Directe), Oct 12, 2009
HAL (Le Centre pour la Communication Scientifique Directe), Oct 1, 2006
This paper addresses an overview of the wireless sensor networks. It is shown that MEMS/NEMS tech... more This paper addresses an overview of the wireless sensor networks. It is shown that MEMS/NEMS technologies and SIP concept are well suited for advanced architectures. It is also shown analog architectures have to be compatible with digital signal techniques to develop smart network of microsystem.
2017 IEEE Symposium on Computers and Communications (ISCC), 2017
This work proposes an approach based on Steiner trees to efficiently support multipoint communica... more This work proposes an approach based on Steiner trees to efficiently support multipoint communications in a multidomain context, where each domain exposes a synthetic and aggregated view of its network. The approach that we propose is based on two pillars: The adoption of a topology aggregation of each domain's network as a Steiner tree and the use of a shortest path heuristic for the calculation of these aggregated networks as well as the global Steiner tree. An extensive experimental study on random and real network topologies shows the gains made by our approach in terms of both accuracy and computational complexity.
2017 13th International Wireless Communications and Mobile Computing Conference (IWCMC), 2017
Unlike other networks, WSNs have the particular characteristic of collecting sensed data and forw... more Unlike other networks, WSNs have the particular characteristic of collecting sensed data and forwarding it to the gateway through a one-way communication protocol. In such data-driven networks, it may seem spontaneous to argue to content-centric networking communication architecture. Through exploiting DFCCN-WSNs implemented previously, we focus on two approaches concerning content update in CCN for Wireless Sensor Networks. Techniques used for content update are either reactive or proactive. In addition, our approaches support multi-user scenarios in order to decrease the propagation of the content object in the network. Through extensive simulations, we demonstrate that the two approaches outperforms traditional CCN in terms of end-to-end delay and energy consumption.
Livrable 1.2 Architecture preliminaire et algorithmes pour le cas d'applications dynamiques e... more Livrable 1.2 Architecture preliminaire et algorithmes pour le cas d'applications dynamiques en environnement maitrise
Réseaux Télécommunications, 2015
Stimulées par la croissance de leur utilisation, tant dans le domaine militaire que dans le domai... more Stimulées par la croissance de leur utilisation, tant dans le domaine militaire que dans le domaine civil, les applications DDS (Data Distribution Service) connaissent une forte croissance dans les réseauxà large envergure. Certaines caractéristiques de ces réseaux comme les longs délais, la limitation de la bande passante et l'interdiction de l'utilisation de certains protocoles dans les réseaux opérationnels (tel le multicast réseau), rendent cependant difficile, voire impossible, leur mise en place. Cet article présente une proposition pour l'interconnexion d'applications DDS sur des réseaux distants. Est d'abord analysée la possibilité d'utiliser le service de routage de la couche middleware DDSà travers la mise en oeuvre d'un "pont-fédéré" DDS permettant d'interconnecter des domaines DDS distincts sur des réseauxétendus. Le concept de "Proxy DDS" qui, comparé avec la solution précédente, permet de réduire le volume de trafić echangé sur le réseau, est ensuite proposé.
Electronics, 2019
Currently, one of the main challenges that large metropolitan areas must face is traffic congesti... more Currently, one of the main challenges that large metropolitan areas must face is traffic congestion. To address this problem, it becomes necessary to implement an efficient solution to control traffic that generates benefits for citizens, such as reducing vehicle journey times and, consequently, environmental pollution. By properly analyzing traffic demand, it is possible to predict future traffic conditions, using this information for the optimization of the routes taken by vehicles. Such an approach becomes especially effective if applied in the context of autonomous vehicles, which have a more predictable behavior, thus enabling city management entities to mitigate the effects of traffic congestion and pollution, thereby improving the traffic flow in a city in a fully centralized manner. This paper represents a step forward towards this novel traffic management paradigm by proposing a route server capable of handling all the traffic in a city, and balancing traffic flows by accou...
Berthou/Satellite and Terrestrial Hybrid Networks, 2015
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Papers by Thierry GAYRAUD