Thierry Gayraud

Thierry Gayraud
Paul Sabatier University - Toulouse III | UPS Toulouse · Faculté des sciences et ingénierie (FSI)

Professor

About

114
Publications
60,838
Reads
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982
Citations
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January 2006 - December 2008
January 2000 - December 2011
January 1970 - present

Publications

Publications (114)
Article
Full-text available
The information-centric networking (ICN) is an emerging paradigm that grounds networking primitives on content names rather than node locators (as in the current Internet). ICN targets seamless mobility, native muticast/multipath support, and content oriented security to better reflect the needs of today users. ICN could greatly improve the efficie...
Conference Paper
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 resc...
Article
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 sc...
Article
Full-text available
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 traffi...
Conference Paper
There is rising interest in applying 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 as scalability, mobility and interferenc...
Conference Paper
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 transm...
Conference Paper
Full-text available
The Content-Centric Networking (CCN) concept is a significant approach of several future Internet research activities. CCN in Wireless Sensor Networks present a promised technique that may ensure data routing based on content. In this paper, we focus on the lifetime of the Content Object exchanged in the network and we explain the idea of its integ...
Book
This book offers the reader the keys for a successful understanding, integration and usage of satellite systems in addition to next generation terrestrial networks. The DVB-S2/RCS system is used to illustrate the integration challenges. The presentation uses a system approach, i.e. it tackles the terrestrial and satellite telecommunication systems'...
Book
Full-text available
Cet ouvrage à pour objectif de donner les clés d’une intégration réussie des systèmes de communication par satellite dans les réseaux terrestres de prochaine génération. Ces challenges sont illustrés par l’utilisation en exemple de systèmes de la famille DVB-S/RCS. Cet ouvrage suit une approche système, en abordant la complexité des réseaux de tél...
Chapter
This chapter addresses the problems related to the transport layer, and especially transmission control protocol (TCP), in satellite/terrestrial hybrid networks. It examines the principle of performance enhancing proxies (PEPs) and why they pose a problem in this context. The chapter explains the evolution of TCP which has significantly evolved in...
Chapter
The internet protocol (IP) multimedia subsystem (IMS) architecture, initially developed by the third generation partnership project (3 GPP) for universal mobile telecommunications system (UMTS) networks, offers an end-to-end quality of service (QoS) architecture which focuses on the access network part. This chapter looks at present difficulties an...
Chapter
This chapter highlights the components and fundamental concepts of bi-directional satellite systems. It examines the details of the digital video broadcast (DVB)-S and DVB-return channel over satellite (RCS) standards which define the mechanisms on physical, data link and network level. The chapter explains the difficulties of integrating satellite...
Chapter
In this chapter, the standards and studies regarding quality of service (QoS) are presented according to the main two approaches corresponding to the two different visions of the implementation of Information Technology (IT) networks: the internet engineering task force (IETF) approach and the ITU-next-generation network (NGN) approach. IETF offers...
Chapter
This chapter examines the issue of mobility in satellite systems by explaining the main types of mobility which exist. It provides a state-of-the-art of the various protocols developed to manage mobility in terrestrial networks. The chapter offers two solutions at different levels providing a mobility of service in the satellite networks which is c...
Article
Full-text available
Currently many aspects of the classical architecture of the Internet are etched in stone – a so called ossification of the Internet – which has led to major obstacles in IPv6 deployment and difficulty in using IP multicast services. Yet, there exist many reasons to extend the Internet, e.g., for improving intra-domain and inter-domain routing for h...
Article
Full-text available
Assuring end-to-end QoS in enterprise distributed real-time and embedded (DRE) systems is hard due to the heterogeneity and transient behavior of communication networks, the lack of integrated mechanisms that schedule communication and computing resources holistically, and the scalability limits of IP multicast in wide-area networks (WANs). This pa...
Conference Paper
Full-text available
Cable-less avionics implementation will clearly improve the efficiency of aircraft while reducing weight and maintenance costs. Therefore, with the technological progress of wireless technologies, an alternative avionic communication architecture based on Ultra WideBand (UWB) technology is proposed to fulfill these new needs. To adapt this wireless...
Conference Paper
Full-text available
Energy consumption is a critical point for sensor networks, which are located in remote places without access to the power grid and must harvest their own energy. The same networks may also have to use Delay Tolerant Networking technologies if they can't have a permanent connectivity. The PEAR routing algorithm was proposed to address the latter pr...
Conference Paper
Full-text available
New trends in cooperative human-machine system use in the domain of transportations are rising. These systems rely on a powerful interaction, or collaboration between humans and machines. This collaboration is made possible by an exchange of information between actors (humans or machines, commonly referred to as agents) in the transport of good or...
Article
Full-text available
Assuring end-to-end quality-of-service (QoS) in distributed real-time and embedded (DRE) systems is hard due to the heterogeneity and scale of communication networks, transient behavior, and the lack of mechanisms that holisti-cally schedule different resources end-to-end. This paper makes two contributions to research focusing on overcoming these...
Article
Full-text available
Assuring end-to-end quality-of-service (QoS) in distributed real-time and embedded (DRE) systems is hard due to the heterogeneity and scale of communication networks, transient behavior, and the lack of mechanisms that holistically schedule different resources end-to-end. This paper makes two contributions to research focusing on overcoming these p...
Article
The opportunities and challenges for using wireless interconnects for safety-critical avionics have been discussed in our previous work. A Wireless Avionics Network (WAN) has been proposed based on hybrid architecture UWB and Switched Ethernet with adequate reliability and security mechanisms to increase scalability and reduce electromagnetic susce...
Conference Paper
Full-text available
Supporting end-to-end quality-of-service (QoS) in Large-scale distributed interactive simulations (DIS) is hard due to the heterogeneity and scale of communication networks, transient behavior, and the lack of mechanisms that holistically schedule different resources end-to-end. This paper aims to cope with these problems in the context of wide are...
Article
Full-text available
Les routeurs mobiles fournissent à leurs nœuds une connexion fiable avec une mobilité transparente. Les protocoles de Transport sont affectés par cette transparence car l'état du réseau d'accès change sans avertissement rendant l'évaluation du réseau difficile. Notre architecture propose d'informer les protocoles de Transport lorsqu'un changement d...
Conference Paper
Full-text available
“Fly-By-Wireless” paradigm based on wireless connectivity in aircraft has the potential to improve efficiency and flexibility, while reducing weight, fuel consumption and maintenance costs. In this paper, first, the opportunities and challenges for wireless technologies in safety-critical avionics context are discussed. Then, the assessment of such...
Conference Paper
Full-text available
Satellite systems will complement terrestrial networks where the network could not be deployed for technical or economical reasons. Moreover, the natural broadcasting capacity of satellite networks makes it a good companion to terrestrial networks. Then, future services will be deployed over networks that combine terrestrial and satellite systems....
Conference Paper
Full-text available
The growing trend towards running publish/subscribe (pub/sub)-based distributed real-time and embedded (DRE) systems in cloud environments motivates the need to achieve end-to-end quality-of-service (QoS) over wide-area networks (WANs). The OMG Data Distribution Service (DDS) is a data-centric middleware that provides fast, scalable and predictable...
Conference Paper
Full-text available
The term “Dense networks” is usually used to identify networks having large number of nodes within a small area while affecting network performance. Starting from this concept, different networking solutions were proposed. However, it seems to us that this view is very abstract and needs to be further investigated. Knowing the network density level...
Article
Full-text available
The rise of new ways of communication along with the spread of mobile Internet will encourage the evolution of public transports to provide uninterrupted Internet service to its customers. It is obvious that using multiple technologies such as Wi-Fi, 3G and satellite each with their own characteristics will enhance the connectivity. Current proposa...
Conference Paper
Full-text available
The use of simulation in training and education enables to prepare personal in realistic environment. But the cost and the complexity to create and reuse simulations often limits their application. In this paper we investigate a low cost and high fidelity PC-based simulator based on Data Distribution Service (DDS) middleware. The main parts of the...
Conference Paper
Full-text available
End-to-end quality of service (QoS) is central to the ob- jectives of the today's networks requirements of middleware based distributed real-time and embedded (DRE) systems. Any middleware based QoS system should be totally oriented to this goal, and in the scope of this purpose several mecha- nisms, components and approaches were, are being and wi...
Conference Paper
Full-text available
Wireless Sensor Network (WSN) is an emerging special type of ad-hoc wireless networks technology. It is usually designed for special purpose applications. WSN has its own special characteristics that differentiate it from other types of wireless networks. These differences raise new challenges to be overcome; one of them is self-organization. As in...
Conference Paper
Full-text available
End-to-end quality-of-service (QoS) support in middleware is critical to achieve publish/subscribe (pub/sub)-based distributed real-time and embedded (DRE) systems. This poster describes ongoing work on supporting QoS properties over wide area networks within the OMG's Data Distribution Service (DDS) by leveraging the Session Initiation Protocol (S...
Article
Full-text available
A primary difficulty when investigating commu-nication 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...
Article
Full-text available
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...
Conference Paper
Full-text available
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...
Conference Paper
Full-text available
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 a...
Article
Full-text available
Research in the field of green-networking is raising more and more interest, in particular driven by energy saving purposes. The global Internet and its thousands of equipments consume an enormous energy amount, have an impact on global warming, and up to now, nobody really addresses subjects dealing with reducing its negative impact on the environ...
Article
Full-text available
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 th...
Conference Paper
Full-text available
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 influence to the state of an entity, sacrificing remote predictive accuracy in favor of low computational complexity. A novel extension of Dead Reckoning is s...
Article
Full-text available
Dead Reckoning mechanism allows reducing the network utilization considerably when used in Distributed Interactive Simulation Applications. 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. The rem...
Article
Full-text available
Real-Time availability of information is of most importance in large scale distributed interactive simulation in network-centric communication. Information generated from multiple federates must be distributed and made available to interested parties and providing the required QoS for consistent communication. The remainder of this paper discuss de...
Chapter
Full-text available
This chapter has explained the way that can be used to provide such a satellite network client with the QoS he requested. It was proven that these QoS archtectures are feasible, that their performances are good enough by several actions like simulation, emulation, and real systems. The work on QoS architecture is still ongoing and heterogeneous acc...
Article
Full-text available
Research in the field of green-networking is raising more and more interest, in particular driven by energy saving purposes. Recent research dealt on one hand to design new mechanisms to reduce the energy consumed in a network device and a second to establish protocols which take into account the energy profile of the material. We believe that the...
Article
Full-text available
The major issue in distributed multimedia simulation is how to specify and implement synchronization scheme satisfying the QoS applications requirements. This paper suggests the use of a powerful synchronization scheme based on HTSPN between different flows issued from distributed multimedia systems to fulfill these requirements. Such an interprete...
Article
Full-text available
Transport protocols have been developed at first for terrestrial networks, but they are also used on communication satellite networks which have specific characteristics such as low bandwidth, QoS architecture and large latency. TCP and SCTP have been intensively studied in several circumstances, recommendations have been provided and results obtai...
Conference Paper
Full-text available
Ultra-wideband (UWB) has been proposed for physical layer standard for high speed wireless personal area networks (WPAN). It has emerged as cost effective and reliable alternative to traditional wireless technologies in WPANs. This paper describes low complexity high data rate Ultra-wideband system based on Wimedia communication protocol. It intend...
Article
Full-text available
Ultra-WideBand (UWB) has been proposed for physical layer standard for high speed Wireless Personal Area Networks (WPAN). It has emerged as cost effective and reliable alternative to traditional wireless technologies in WPANs. This paper describes low complexity high data rate Ultra-WideBand system based on Wimedia communication protocol. It intend...
Article
Full-text available
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.
Article
Full-text available
Owing to its modular design and implementation, the SATIP6 satellite emulation platform is able to emulate a transparent DVB-RCS (Digital Video Broadcasting Return Channel via Satellite) system dimensioned around a single Hub, or a system using a regenerative satellite with an on-board switching matrix only by changing some configuration files. Aft...
Article
Full-text available
Satellite networks are enhanced permanently: new coding techniques, changes in the allocation algorithm or new technologies. These features are first implemented on a test bed in order to prove their efficiency, but an emulation platform is expensive and its implementation is time consuming. A simulation model can solve these issues, by giving a fi...
Article
Full-text available
Ultra-Wideband (UWB) radio has been proposed for physical layer standard for high Speed wireless personal area network (WPANs). One proposal is referred to as Multiband Orthogonal Frequency Division Multiplexing (MB-OFDM). This paper proposes to evaluate this powerful modulation scheme in a wireless field bus for aerospace industry hardware system...
Article
Full-text available
Broadband satellite will play an important role to provide universal broadband access for the users. In order to lower the cost, the next-generation satellite systems should support IPv6 and seamlessly integrate with terrestrial networks, including wireless local loops. Based on the studies on the requirements and design constraints, in this paper,...
Conference Paper
The comprehensive evaluation of satellite systems is not an easy task because of system complexity, bandwidth limitation and cost. The objective of this work is to propose an evaluation of the system in order to choose the pertinent parameters to optimize the QoS and link utilization, for the satisfaction of users and operators. First, a selection...
Conference Paper
The SatSix project introduces a mobility architecture based on Mobile IPv6 to support user mobility at IP level. We report here the validation and performance assessment of the main functions of this architecture, based on studies that were performed with the SatSix network emulation testbed. Handover delay analysis, implementation of mobility and...
Article
Next-generation broadband satellite systems will have the capability to provide cost-effective universal broadband access for the users. But in order to meet userspsila requirements, many enhancements have to be made on the existing satellite technologies. One of the promising methods is the introduction of cross-layer design. There are several adv...
Conference Paper
Full-text available
This paper introduces a Web services based approach that extends resource reservation mechanism for interactive multimedia applications over multimedia satellite systems. It proposes a flexible and extensible scheme for the discovery of services in the network and the configuration of the satellite terminal when resources are requested. It finally...
Conference Paper
Full-text available
This paper presents the three different platforms developed within the frame of the SATSIX European project and shows live trials description and results. To prepare final experimentations on the SATSIX platform (Q3 2008), satellite emulation test bed is used to validate and to show performance evaluations of several features. The major achievement...