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Dissertations / Theses on the topic 'Communications opportunistes'

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Published: 21 December 2024
Last updated: 31 July 2025

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1

Shikfa, Abdullatif. "Sécurité des communications opportunistes." Paris, Télécom ParisTech, 2010. http://www.theses.fr/2010ENST0045.

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Dans cette thèse, nous étudions la sécurité des communications opportunistes. Dans ce nouveau type de communication, la mobilité des nœuds implique que les solutions de sécurité doivent être dynamiques et locales. Par ailleurs l’absence de connectivité bout-en-bout compromet toute solution de sécurité interactive. En outre, contrairement au routage traditionnel basé sur des adresses, les nouvelles stratégies de transmission opportunistes utilisent des informations comme le contexte d'un nœud ou le contenu d'un message pour prendre les décisions de transfert. Contexte et contenu sont des inform
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2

Koteich, Jana. "Routage opportuniste tenant compte du contexte dans les réseaux sans fil." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILB018.

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Aujourd'hui, le partage des données et du contenu numérique est essentiel dans diverses applications, notamment dans les domaines de la santé, de l'éducation et de l'agriculture. Les réseaux câblés traditionnels et les réseaux sans fil sont les deux principaux modes de communication, ces derniers présentant davantage de difficultés en raison de l'absence de chemin physique guidé. Le routage opportuniste apparaît comme une solution prometteuse dans les régions dépourvues d'infrastructures de communication, en particulier dans les pays les moins avancés.Dans cette thèse, nous proposons une solut
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3

Benchi, Abdulkader. "Middleware Systems for Opportunistic Computing in Challenged Wireless Networks." Thesis, Lorient, 2015. http://www.theses.fr/2015LORIS372/document.

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Les réseaux mobiles opportunistes (ou OppNets, pour Opportunistic Networks) constituent une solution séduisante pour compléter les réseaux fixes d’infrastructure, voire compenser leur absence dans des zones sinistrées ou défavorisées. Les recherches menées ces dernières années ont principalement visé à permettre les transmissions dans les OppNets, mais ceci ne peut être qu’un premier pas vers une réelle exploitation de tels environnements contraints. L’informatique opportuniste (Opportunistic Computing) dépasse le cadre des seules transmissions, et introduit un nouveau paradigme d’exécution de
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4

Belouanas, Salah-Eddine. "Dissémination de contenus populaires et tolérants au délai dans les réseaux cellulaires." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066230/document.

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Les ressources cellulaires sont précieuses et doivent être préservées dès que possible. Dans cette thèse, nous abordons le problème de la dissémination de contenus dans un réseau cellulaire surchargé. La première partie présente SCoD (Scheduled Content Delivery), une stratégie de dissémination purement cellulaire qui exploite la mobilité des utilisateurs ainsi que leur tolérance aux délais afin d’effectuer des transmissions différées. SCoD attend que les utilisateurs se rassemblent autour d’un minimum de points d’accès afin que le nombre total de transmissions soit réduit. Pour déclencher des
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5

Belouanas, Salah-Eddine. "Dissémination de contenus populaires et tolérants au délai dans les réseaux cellulaires." Electronic Thesis or Diss., Paris 6, 2017. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2017PA066230.pdf.

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Les ressources cellulaires sont précieuses et doivent être préservées dès que possible. Dans cette thèse, nous abordons le problème de la dissémination de contenus dans un réseau cellulaire surchargé. La première partie présente SCoD (Scheduled Content Delivery), une stratégie de dissémination purement cellulaire qui exploite la mobilité des utilisateurs ainsi que leur tolérance aux délais afin d’effectuer des transmissions différées. SCoD attend que les utilisateurs se rassemblent autour d’un minimum de points d’accès afin que le nombre total de transmissions soit réduit. Pour déclencher des
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6

Gorbil, Gokce. "Opportunistic communications for emergency support." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/14674.

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In this thesis, we consider the problem of providing emergency support when existing communication infrastructure is unavailable. We propose using opportunistic communications (oppcomms) among mobile devices carried by civilians for the dissemination of emergency information. With oppcomms, devices exchange mes- sages at a close range of a few to tens of meters with limited or no infrastructure and messages are carried over multiple hops in a "store-carry-forward" manner by exploiting human mobility. We specifically look at the evacuation component of emergency response and propose an emergenc
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7

To, Toan. "Distributed opportunistic scheduling algorithms for wireless communications." Thesis, Swansea University, 2012. https://cronfa.swan.ac.uk/Record/cronfa42588.

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In this thesis, we propose a number of distributed schemes for wireless communications in the cross layer design context, considering an uplink random access network in which multiple users communicate with a common base station. In addition, we perform a comprehensive study on a splitting based multiuser selection algorithm which is simple, effective, and scales with the network size. First, we investigate a reservation-type protocol in a channel aware ALOHA system. Various Markovian models are used to describe the system and to capture the temporal correlation of the channel evolution. The a
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8

Bjurefors, Fredrik. "Measurements in opportunistic networks." Licentiate thesis, Uppsala universitet, Avdelningen för datorteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-227626.

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Opportunistic networks are a subset of delay tolerant networks where the contacts are unscheduled. Such networks can be formed ad hoc by wireless devices, such as mobile phones and laptops. In this work we use a data-centric architecture for opportunistic networks to evaluate data dissemination overhead, congestion in nodes' buffer, and the impact of transfer ordering. Dissemination brings an overhead since data is replicated to be spread in the network and overhead leads to congestion, i.e., overloaded buffers. We develop and implement an emulation testbed to experimentally evaluate propertie
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9

Kouyoumdjieva, Sylvia T. "System Design for Opportunistic Networks." Doctoral thesis, KTH, Kommunikationsnät, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176479.

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Device-to-device communication has been suggested as a complement to traditional cellular networks as a means of offloading cellular traffic. In this thesis we explore a solution for device-to-device communication based on opportunistic content distribution in a content-centric network. Communication opportunities arise as mobile nodes roam around in an area and occasionally enter in direct communication range with one another. We consider a node to be a pedestrian equipped with a mobile device and explore the properties of opportunistic communication in the context of content dissemination in
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10

Dillon, PJ. "Enabling tetherless care with context-awareness and opportunistic communication." Thesis, University of Pittsburgh, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3690742.

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<p> Tetherless care is a novel healthcare delivery paradigm that enables an interaction between caregivers and patients beyond the confines of traditional points of care. This thesis presents a synthesis of recent advances in wearable, ubiquitous sensing; mobile computing; wireless networks; and health information technology into a cohesive framework that enables and supports the tetherless care concept. Tetherless care is formally defined and modeled in a higher order logical framework. The model distills three relations between several classes in the model&rsquo;s domain of discourse. A prot
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11

Eltayeb, Mohammed. "Opportunistic Scheduling with Limited Feedback in Wireless Communication Networks." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1414874159.

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12

Khan, Sardar Kashif Ashraf. "Message forwarding techniques in Bluetooth enabled opportunistic communication environment." Thesis, Middlesex University, 2015. http://eprints.mdx.ac.uk/17327/.

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These days, most of the mobile phones are smart enough with computer like intelligence and equipped with multiple communication technologies such as Bluetooth, wireless LAN, GPRS and GSM. Different communication medium on single device have unlocked the new horizon of communication means. Modern mobile phones are not only capable of using traditional way of communication via GSM or GPRS; but, also use wireless LANs using access points where available. Among these communication means, Bluetooth technology is very intriguing and unique in nature. Any two devices equipped with Bluetooth technolog
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13

Kurth, Mathias. "Contention techniques for opportunistic communication in wireless mesh networks." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2012. http://dx.doi.org/10.18452/16458.

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Auf dem Gebiet der drahtlosen Kommunikation und insbesondere auf den tieferen Netzwerkschichten sind gewaltige Fortschritte zu verzeichnen. Innovative Konzepte und Technologien auf der physikalischen Schicht (PHY) gehen dabei zeitnah in zelluläre Netze ein. Drahtlose Maschennetzwerke (WMNs) können mit diesem Innovationstempo nicht mithalten. Die Mehrnutzer-Kommunikation ist ein Grundpfeiler vieler angewandter PHY Technologien, die sich in WMNs nur ungenügend auf die etablierte Schichtenarchitektur abbilden lässt. Insbesondere ist das Problem des Scheduling in WMNs inhärent komplex. Erstaunlic
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Perez-Ramirez, Javier. "An Opportunistic Relaying Scheme for Optimal Communications and Source Localization." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581448.

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ITC/USA 2012 Conference Proceedings / The Forty-Eighth Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2012 / Town and Country Resort & Convention Center, San Diego, California<br>The selection of relay nodes (RNs) for optimal communication and source location estimation is studied. The RNs are randomly placed at fixed and known locations over a geographical area. A mobile source senses and collects data at various locations over the area and transmits the data to a destination node with the help of the RNs. The destination node not only needs to collect
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15

Huang, Wen, and 黄文. "Opportunistic scheduling in wireless data networks." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45895235.

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16

Nasif, Ahmed O. "Opportunistic spectrum access using localization techniques." Fairfax, VA : George Mason University, 2009. http://hdl.handle.net/1920/4572.

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Thesis (Ph.D.)--George Mason University, 2009.<br>Vita: p. 146. Thesis director: Brian L. Mark. Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Electrical and Computer Engineering. Title from PDF t.p. (viewed Oct. 11, 2009). Includes bibliographical references (p. 138-145). Also issued in print.
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17

Cao, Yaofu. "Modélisation du contexte social : application aux réseaux opportunistes." Thesis, Troyes, 2017. http://www.theses.fr/2017TROY0002/document.

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Cette thèse traite de l’adaptation automatique des applications sensibles au contexte par l’utilisation d’informations liées à l’environnement social des utilisateurs afin d’enrichir le service rendu par les applications. Pour cela, notre contribution s’articule autour de la modélisation multidimensionnelle des différents niveaux de contextes sociaux, notamment le poids de la relation entre les acteurs. Plus spécifiquement, nous synthétisons des contextes sociaux non seulement liés à la familiarité mais aussi liés à la similitude des communautés statiques et dynamiques. Deux modèles basés resp
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18

Butt, M. Majid. "On the Near-Far Gain in Opportunistic and Cooperative Multiuser Communications." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12009.

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In this dissertation, we explore the issues related to opportunistic and cooperative communications in a multiuser environment. In the first part of the dissertation, we consider opportunistic scheduling for delay limited systems. Multiuser communication over fading channels is a challenging problem due to fast varying channel conditions. On the other hand, it provides opportunities to exploit the varying nature of the channel and maximize the throughput by scheduling the user (or users) with good channel. This gain is termed as multiuser diversity. The larger the number of users, the greater
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19

Kathiravelu, Thabotharan. "Towards content distribution in opportunistic networks." Licentiate thesis, Uppsala universitet, Avdelningen för datorteknik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-85837.

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Opportunistic networking is a new communication paradigm. Content Distribution in opportunistic networks is challenging due to intermittent connectivity, short connection durations and a highly dynamic topology. Research is needed to develop new applications and protocols that can distribute content in opportunistic networks. This thesis explores and evaluates approaches to developing mobile P2P systems for content distribution, focusing mainly on the problem of modeling device contacts. Contact duration and patterns of connections influence routing and forwarding strategies. To model device c
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Rajaei, Aydin. "Efficient and flexible geocasting for opportunistic networks." Thesis, University of Sussex, 2016. http://sro.sussex.ac.uk/id/eprint/66039/.

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With the proliferation of smartphones and their advanced connectivity capabilities, opportunistic networks have gained a lot of traction during the past years; they are suitable for increasing network capacity and sharing ephemeral, localised content. They can also offload traffic from cellular networks to device-to-device ones, when cellular networks are heavily stressed. Opportunistic networks can play a crucial role in communication scenarios where the network infrastructure is inaccessible due to natural disasters, large scale terrorist attacks or government censorship. Geocasting, where m
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Chen, Yuan. "Opportunistic Overlays: Efficient Content Delivery in Mobile Environments." Diss., Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-04082005-002659/unrestricted/chen%5Fyuan%5F200505%5Fphd.pdf.

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Thesis (Ph. D.)--Computing, Georgia Institute of Technology, 2005.<br>Riley, George, Committee Member ; Zhou, Dong, Committee Member ; Pu, Calton, Committee Member ; Ahamad, Mustaque, Committee Member ; Schwan, Karsten, Committee Chair. Vita. Includes bibliographical references.
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Loke, Yong. "Sensor synchronization, geolocation and wireless communication in a shipboard opportunistic array." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Mar%5FLoke.pdf.

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23

Scone, Sion. "Opportunistic communication schemes for unmanned vehicles in urban search and rescue." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/7269.

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In urban search and rescue (USAR) operations, there is a considerable amount of danger faced by rescuers. The use of mobile robots can alleviate this issue. Coordinating the search effort is made more difficult by the communication issues typically faced in these environments, such that communication is often restricted. With small numbers of robots, it is necessary to break communication links in order to explore the entire environment. The robots can be viewed as a broken ad hoc network, relying on opportunistic contact in order to share data. In order to minimise overheads when exchanging d
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Almeida, Rodrigo Coelho. "A multi-technology network for environmental data gathering through opportunistic communication." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23783.

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mestrado em Engenharia Eletrónica e Telecomunicações<br>O conceito de Smart City surge da combinação do paradigma de Internet of Things (IoT) sobre contextos urbanos aliado à exploração de soluções de Tecnologias de Informação e Comunicação (TIC). O típico cenário de Smart City tem de lidar com desafios, tais como as elevadas quantidades de sensores e geradores de dados, dos quais alguns são colocados em dispositivos de grande mobilidade, visando a recolha e geração de todo o tipo de informações e levando ao aumento do número de dispositivos comunicantes. Esta dissertação foca o desenvo
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Trotta, Angelo <1985&gt. "Next-Generation Public Safety Systems Based on Autonomous Vehicles and Opportunistic Communications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/8065/1/TesiDottoratoAngeloTrottaFinal.pdf.

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An emergency scenario is characterized by the unpredictability of the environment conditions and by the scarcity of the available communication infrastructures. After a natural or human disaster, the main public and private infrastructures are partially damaged or totally destroyed. These infrastructures include roads, bridges, water supplies, electrical grids, telecommunications and so on. In these conditions, the first rescue operations executed by the public safety organizations can be very difficult, due to the unpredictability of the disaster area environment and the lack in the communic
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Klaghstan, Merza. "Multimedia data dissemination in opportunistic systems." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI125/document.

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Les réseaux opportunistes sont des réseaux mobiles qui se forment spontanément et de manière dynamique grâce à un ensemble d'utilisateurs itinérants dont le nombre et le déplacement ne sont pas prévisibles. En conséquence, la topologie et la densité de tels réseaux évoluent sans cesse. La diffusion de bout-en-bout d'informations, dans ce contexte, est incertaine du fait de la forte instabilité des liens réseaux point à point entre les utilisateurs. Les travaux qui en ont envisagé l'usage visent pour la plupart des applications impliquant l'envoi de message de petite taille. Cependant, la trans
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Martin-Guillerez, Damien Banâtre Michel. "Mécanismes de prise de points de reprise opportunistes pour robots mobiles autonomes." Rennes : [s.n.], 2009. ftp://ftp.irisa.fr/techreports/theses/2009/martin-guillerez.pdf.

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Erpek, Tugba. "Location-based propagation modeling for opportunistic spectrum access in wireless networks." Fairfax, VA : George Mason University, 2007. http://hdl.handle.net/1920/2934.

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Thesis (M.S.)--George Mason University, 2007.<br>Title from PDF t.p. (viewed Jan. 17, 2008). Thesis director: Brian L. Mark Submitted in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering. Vita: p. 60. Includes bibliographical references (p. 58-59). Also available in print.
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Ullah, Kifayat. "On the use of opportunistic vehicular communication for roadside services advertisement and discovery." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-27102016-142325/.

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Vehicular Ad hoc Network (VANET) is a special kind of Mobile Ad hoc Network (MANET) and is a key enabling technology for Intelligent Transportation Systems (ITS). It plays an important role in the deployment of a large scale of both safety and non-safety applications. Among non-safety applications, an important and challenging area is the provision of information about roadside services advertisement and discovery. In this work, we adopted the beaconing strategy and opportunistic vehicular communications to address the problem of roadside services advertisement and discovery on the highways. O
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Martin-Guillerez, Damien. "Mécanismes de prise de points de reprise opportunistes pour robots mobiles autonomes." Rennes 1, 2009. ftp://ftp.irisa.fr/techreports/theses/2009/martin-guillerez.pdf.

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Les systèmes informatiques connaissent des défaillances qui entraînent des pertes de données. Les systèmes robotiques collaboratifs, opérant de manière autonome, sont très sensibles à ces défaillances. L'usage de mécanismes de sauvegarde est alors utile. Les mécanismes de communication opportuniste reposent sur les technologies de communication sans-fil courte portée pour permettre des interactions entre deux calculateurs mobiles lorsque leur proximité physique le permet. Pour pallier l'absence d'une couverte réseau permanente, nous proposons un système de sauvegarde basé sur les communication
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Dunat, Jean-Christophe. "Allocation opportuniste de spectre pour les radios cognitives." Phd thesis, Paris : École nationale supérieure des télécommunications, 2006. http://catalogue.bnf.fr/ark:/12148/cb40978484c.

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Martínez-Vidal, Rubén. "Architectures for aeronautical opportunistic networking." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/319697.

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En els últims anys, el camp de les comunicacions aeronàutiques ha experimentat un increment en la demanda d'intercanvis de dades entre plataformes terrestres, aèries i satelitals. Els mètodes de comunicació aeronàutics convencionals han demostrat no ser suficients per manejar aquesta demanda creixent. Com a resultat, els sistemes aeronàutics han tendit cap a l'ús de comunicacions via satèl·lit, que encara que efectives, suposen un repte econòmic tant en la seva instal·lació com en el seu ús. En resposta a aquest problema, el treball acadèmic en aquesta àrea ha proposat l'ús d'alternatives basa
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Tsokalo, Ievgenii [Verfasser], Ralf [Gutachter] Lehnert, and Lutz [Gutachter] Lampe. "Opportunistic Routing with Network Coding in Powerline Communications / Ievgenii Tsokalo ; Gutachter: Ralf Lehnert, Lutz Lampe." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1226811167/34.

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De, Sousa Chaves Fabiano. "Controle de potência oportunista e equalização robusta em redes de comunicação sem fio : enfoques via controle automático e teoria dos jogos." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2010. http://tel.archives-ouvertes.fr/tel-00618079.

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L'interférence est un facteur de limitation de performance individuelle et globale dans les réseaux de communication sans fil. Dans ce travail, deux techniques classiques de gestion de l'interférence sont étudiées : le contrôle de puissance d'émission et l'égalisation du canal. Trois approches sont considérées pour Le contrôle de puissance décentralisé et opportuniste. La première est basée sur la théorie des jeux non-coopératifs statiques et les théories de fonctions itératives, d'où résulte la proposition d'une classe d'algorithmes. Dans la deuxième approche, nous proposons quelques algorith
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Wang, Yufeng. "Opportunistic Scheduling and Cooperative Relaying in Wireless Networks." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4416.

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The demand for ever larger, more efficient, reliable and cost effective communication networks necessitates new network architectures, such as wireless ad hoc networks, cognitive radio, relaying networks, and wireless sensor networks. The study of such networks requires a fundamental shift from thinking of a network as a collection of independent communication pipes, to a multi-user channel where users cooperate via conferencing, relaying, and joint source-channel coding. The traditional centralized networks, such as cellular networks, include a central controller and a fixed infrastructure, i
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Kurth, Mathias [Verfasser], Jens-Peter [Akademischer Betreuer] Redlich, Adam [Akademischer Betreuer] Wolisz, and Mesut [Akademischer Betreuer] Güne¸s. "Contention techniques for opportunistic communication in wireless mesh networks : a cross-layer perspective on opportunistic routing and opportunistic scheduling under carrier sensing multiple access / Mathias Kurth. Gutachter: Jens-Peter Redlich ; Adam Wolisz ; Mesut Güne¸s." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2012. http://d-nb.info/1019790008/34.

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Bhadane, Kunal. "A Cognitive Radio Application through Opportunistic Spectrum Access." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc984265/.

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In wireless communication systems, one of the most important resources being focused on all the researchers is spectrum. A cognitive radio (CR) system is one of the efficient ways to access the radio spectrum opportunistically, and efficiently use the available underutilized licensed spectrum. Spectrum utilization can be significantly enhanced by developing more applications with adopting CR technology. CR systems are implemented using a radio technology called software-defined radios (SDR). SDR provides a flexible and cost-effective solution to fulfil the requirements of end users. We can see
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Kailas, Aravind. "Toward perpetual wireless networks: opportunistic large arrays with transmission thresholds and energy harvesting." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34720.

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Solving the key issue of sustainability of battery-powered sensors continues to attract significant research attention. The prevailing theme of this research is to address this concern using energy-efficient protocols based on a form of simple cooperative transmission (CT) called the opportunistic large arrays (OLAs), and intelligent exploitation of energy harvesting and hybrid energy storage systems (HESSs). The two key contributions of this research, namely, OLA with transmission threshold (OLA-T) and alternating OLA-T (A-OLA-T), offer an signal-to-noise ratio (SNR) advantage (i.e., benefit
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Azeem, Muhammad Moazam. "Erasure Correcting Codes for Opportunistic Spectrum Access (OSA)." Electronic Thesis or Diss., Paris, CNAM, 2014. http://www.theses.fr/2014CNAM1002.

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Les années récentes ont vu l’explosion du trafic sur les réseaux mobiles depuis l’apparition de nouveaux terminaux (smartphones, tablettes) et des usages qu’ils permettent, en particulier les données multimédia, le trafic voix restant sensiblement constant. Une conséquence est le besoin de plus de spectre, ou la nécessité de mieux utiliser le spectre déjà alloué. Comme il n’y a pas de coordination entre les utilisateurs secondaire(s) et primaire, avant toute transmission les premiers doivent mettre en œuvre des traitements pour détecter les périodes dans lesquelles l’utilisateur primaire trans
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Silva, Rodrigo. "ITS-based decision making mechanism for opportunistic networking in heterogeneous network environment." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2020. http://www.theses.fr/2020IMTA0174.

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Le nombre de véhicules connectés augmentent et pour une utilisation plus intelligente des systèmes de transport, les véhicules ont besoin d’accroître leur connaissance de l’environnement. Cela peut être atteint en permettant aux véhicules de communiquer avec leur environnement. Pour une connectivité omniprésente, il sera nécessaire d’utiliser diverses technologies sans fil, existantes. Dans un tel environnement de réseau d’accès hétérogène, il est nécessaire de fournir aux applications des mécanismes décisionnels transparents pour gérer l’affectation des flux de données sur les réseaux disponi
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41

Sammarco, Matteo. "Dissémination multi-contenus opportuniste : monitorage passif et adaptation aux conditions du réseau." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066573/document.

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La pénétration du marché des appareils mobiles a connu une croissance impressionnante ces dernières années. Smartphones, tablettes et ordinateurs portables sont devenus soit producteurs soit consommateurs de contenus générés par les utilisateurs. Les communications opportunistes permettent une couverture étendue dans les endroits où il n'existe aucune infrastructure réseau disponible et des stratégies de délestage de données pour aider les opérateurs à soulager la charge de leurs infrastructures. Dans cette thèse, nous considérons le cas de la diffusion opportuniste de plusieurs grands contenu
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42

Sammarco, Matteo. "Dissémination multi-contenus opportuniste : monitorage passif et adaptation aux conditions du réseau." Electronic Thesis or Diss., Paris 6, 2014. http://www.theses.fr/2014PA066573.

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La pénétration du marché des appareils mobiles a connu une croissance impressionnante ces dernières années. Smartphones, tablettes et ordinateurs portables sont devenus soit producteurs soit consommateurs de contenus générés par les utilisateurs. Les communications opportunistes permettent une couverture étendue dans les endroits où il n'existe aucune infrastructure réseau disponible et des stratégies de délestage de données pour aider les opérateurs à soulager la charge de leurs infrastructures. Dans cette thèse, nous considérons le cas de la diffusion opportuniste de plusieurs grands contenu
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43

Shatila, Hazem Sarwat. "Adaptive Radio Resource Management in Cognitive Radio Communications using Fuzzy Reasoning." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26618.

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As wireless technologies evolve, novel innovations and concepts are required to dynamically and automatically alter various radio parameters in accordance with the radio environment. These innovations open the door for cognitive radio (CR), a new concept in telecommunications. CR makes its decisions using an inference engine, which can learn and adapt to changes in radio conditions. Fuzzy logic (FL) is the proposed decision-making algorithm for controlling the CRâ s inference engine. Fuzzy logic is well-suited for vague environments in which incomplete and heterogeneous information is pre
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Bolas, Eduardo José Ludovico. "Broadband VHF maritime communications based on cognitive radio." Doctoral thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/16285.

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Doutoramento em Engenharia Eletrotécnica<br>Traditionally, maritime business is associated to transportation, which represents about 90% of global trade, and fishery, but new activities at sea, opened up by technological innovations, are transforming economical context of maritime services and resources. In the future, the massive use of technology to support endurance and ranging of maritime operations, namely in intelligent transport systems and autonomous vehicles areas, would lead to federations of maritime based embedded computing devices. Nevertheless, existing systems are not pre
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45

Moradinia, Pourya, and Imal Sakhi. "Mobile Opportunistic Services for Experience Sharing : Via a NetInf Android Application." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104297.

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Information-Centric Networking (ICN) is a new research area concerning creating a new network architecture that would be more suitable for both current and the future's network. The MOSES (Mobile Opportunistic Services for Experience Sharing) project is part of this development. The project works with the development and demonstration of the Network of Information (NetInf) protocol, which is an implementation of the ICN concept. This Master’s thesis project is part of the MOSES project and aims to assist the MOSES project with the demonstration of a mobile opportunistic sharing concept based o
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46

Murugesan, Sugumar. "Opportunistic Scheduling Using Channel Memory in Markov-modeled Wireless Networks." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1282065836.

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Haillot, Julien. "Définition et validation d'un modèle de communication supportant la communication basée contenus dans les réseaux mobiles ad hoc discontinus." Phd thesis, Université de Bretagne Sud, 2010. http://tel.archives-ouvertes.fr/tel-00599669.

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L'activité de recherche des dernières décennies dans le domaine des réseaux mobiles ad hoc (MANETs) a essentiellement visé à définir des méthodes de routage dynamique au sein de ces réseaux. La plupart des propositions faites dans cette optique reposent sur l'hypothèse que la communication entre deux terminaux mobiles n'est possible que si une route pour l'acheminement des messages peut être établie entre ces terminaux lorsque cela est nécessaire. Cette approche équivaut à considérer que la ommunication entre deux terminaux ne peut être réalisée que dans un réseau totalement connexe. Depuis qu
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48

Wang, Kehao. "Multi-channel opportunistic access : a restless multi-armed bandit perspective." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00832569.

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In the thesis, we address the fundamental problem of opportunistic spectrum access in a multi-channel communication system. Specifically, we consider a communication system in which a user has access to multiple channels, but is limited to sensing and transmitting only on one at a given time. We explore how the smart user should exploit past observations and the knowledge of the stochastic properties of these channels to maximize its transmission rate by switching channels opportunistically. Formally, we provide a generic analysis on the opportunistic spectrum access problem by casting the pro
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Gungor, Onur. "INFORMATION THEORY ENABLED SECURE WIRELESS COMMUNICATION, KEY GENERATION AND AUTHENTICATION." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1406298547.

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Thanayankizil, Lakshmi. "Opportunistic large array (OLA)-based routing for sensor and adhoc wireless networks." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50374.

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An Opportunistic Large Array (OLA) is a form of cooperative diversity in which a large group of simple, inexpensive relays operate without any mutual coordination, but naturally fire together in response to the energy received from a single source or another OLA. The main contributions of this thesis are the introduction of two OLA-based routing protocols: OLA Concentric Routing Algorithm (OLACRA), which is an upstream routing algorithm suitable for static wireless sensor networks (WSNs), and OLA Routing On-Demand (OLAROAD), which is a robust reactive routing scheme suitable for mobile ad hoc
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