15 research outputs found

    Products and Services

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    Todayñ€ℱs global economy offers more opportunities, but is also more complex and competitive than ever before. This fact leads to a wide range of research activity in different fields of interest, especially in the so-called high-tech sectors. This book is a result of widespread research and development activity from many researchers worldwide, covering the aspects of development activities in general, as well as various aspects of the practical application of knowledge

    Methods of implementation of context-aware platforms and context-aware user interfaces for applications in consumer electronics

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    U okviru disertacije predstavljene su metode realizacije kontekstualnih platformi i kontekstualnih korisničkih sprega za uređaje potroĆĄačke elektronike. PredloĆŸeni su algoritmi semantizacije konteksta i procene zauzetosti korisnika, arhitektura reĆĄenja i rezultati evaluacije.  In this dissertation methods of implementation of context-aware platforms and context-aware user interfaces for applications in consumer electronics are presented. The work includes the proposition of algorithms for context semantization and user availability estimation, architecture of the solution as well as the results of evaluation experiments

    Convergence du web et des services de communication

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    Les services de communication, du courrier postal Ă  la tĂ©lĂ©phonie, en passant par la voix et la vidĂ©o sur IP (Internet Protocol), la messagerie Ă©lectronique, les salons de discussion sur Internet, les visioconfĂ©rences ou les tĂ©lĂ©communications immersives ont Ă©voluĂ© au fil du temps. Un systĂšme de communication voix-vidĂ©o sur IP est rĂ©alisĂ© grĂące Ă  deux couches architecturales fondamentales : la couche de signalisation et la couche mĂ©dia. Le protocole de signalisation est utilisĂ© pour crĂ©er, modifier et terminer des sessions multimĂ©dias entre des participants. La couche de signalisation est divisĂ©e en deux sous-couches - la couche de service et celle de contrĂŽle - selon la spĂ©cification de l IP Multimedia Subsystem (IMS). Deux systĂšmes de communication largement utilisĂ©s sont l IMS et SIP Pair-Ă - Pair (P2P SIP). Les fournisseurs de services, qui se comportent en tant qu intermĂ©diaires entre appelants et appelĂ©s, implĂ©mentent les systĂšmes de communication, contrĂŽlant strictement la couche signalisation. Or ces fournisseurs de services ne prennent pas en compte la diversitĂ© des utilisateurs. Cette thĂšse identifie trois barriĂšres technologiques dans les systĂšmes de communication actuels et plus prĂ©cisĂ©ment concernant la couche de signalisation. I. Un manque d ouverture et de flexibilitĂ© dans la couche de signalisation pour les utilisateurs. II. Un dĂ©veloppement difficile des services basĂ©s sur le rĂ©seau et les sessions. III. Une complexification du la couche de signalisation lors d un trĂšs grand nombre d appels. Ces barriĂšres technologiques gĂȘnent l innovation des utilisateurs avec ces services de communication. BasĂ© sur les barriĂšres technologiques listĂ©es cidessus, le but initial de cette thĂšse est de dĂ©finir un concept et une architecture de systĂšme de communication dans lequel chaque individu devient un fournisseur de service. Le concept, "My Own Communication Service Provider" (MOCSP) et le systĂšme MOCSP sont proposĂ©s, accompagnĂ© d un diagramme de sĂ©quence. Ensuite, la thĂšse fournit une analyse qui compare le systĂšme MOCSP avec les systĂšmes de communication existants en termes d ouverture et de flexibilitĂ©. La seconde partie de la thĂšse prĂ©sente des solutions pour les services basĂ©s sur le rĂ©seau ou les sessions, mettant en avant le systĂšme MOCSP proposĂ©. Deux services innovants, user mobility et partial session transfer/retrieval (PSTR) sont pris comme exemples de services basĂ©s sur le rĂ©seau ou les sessions. Les services basĂ©s sur un rĂ©seau ou des sessions interagissent avec une session ou sont exĂ©cutĂ©s dans une session. Dans les deux cas, une seule entitĂ© fonctionnelle entre l appelant et l appelĂ© dĂ©clenche le flux multimĂ©dia pendant l initialisation de l appel et/ou en cours de communication. De plus, la coopĂ©ration entre le contrĂŽle d appel rĂ©seau et les diffĂ©rents pairs est facilement rĂ©alisĂ©. La derniĂšre partie de la thĂšse est dĂ©diĂ©e Ă  l extension de MOCSP en cas de forte densitĂ© d appels, elle inclut une analyse comparative. Cette analyse dĂ©pend de quatre facteurs - limite de passage Ă  l Ă©chelle, niveau de complexitĂ©, ressources de calcul requises et dĂ©lais d Ă©tablissement de session - qui sont considĂ©rĂ©s pour Ă©valuer le passage Ă  l Ă©chelle de la couche de signalisation. L analyse comparative montre clairement que la solution basĂ©e sur MOCSP est simple et amĂ©liore l usage effectif des ressources de calcul par rapport aux systĂšmes de communication traditionnelsDifferent communication services from delivery of written letters to telephones, voice/video over Internet Protocol(IP), email, Internet chat rooms, and video/audio conferences, immersive communications have evolved over time. A communication system of voice/video over IP is the realization of a two fundamental layered architecture, signaling layer and media layer. The signaling protocol is used to create, modify, and terminate media sessions between participants. The signaling layer is further divided into two layers, service layer and service control layer, in the IP Multimedia Subsystem (IMS) specification. Two widely used communication systems are IMS, and Peer-to-Peer Session Initiation Protocol (P2P SIP). Service providers, who behave as brokers between callers and callees, implement communication systems, heavily controlling the signaling layer. These providers do not take the diversity aspect of end users into account. This dissertation identifies three technical barriers in the current communication systems especially in the signaling layer. Those are: I. lack of openness and flexibility in the signaling layer for end users. II. difficulty of development of network-based, session-based services. III. the signaling layer becomes complex during the high call rate. These technical barriers hinder the end-user innovation with communication services. Based on the above listed technical barriers, the first part of this thesis defines a concept and architecture for a communication system in which an individual user becomes the service provider. The concept, My Own Communication Service Provider (MOCSP) and MOCSP system is proposed and followed by a call flow. Later, this thesis provides an analysis that compares the MOCSP system with existing communication systems in terms of openness and flexibility. The second part of this thesis presents solutions for network-based, session based services, leveraging the proposed MOCSP system. Two innovative services, user mobility and partial session transfer/retrieval are considered as examples for network-based, session-based services. The network-based, sessionbased services interwork with a session or are executed within a session. In both cases, a single functional entity between caller and callee consistently enables the media flow during the call initiation and/or mid-call. In addition, the cooperation of network call control and end-points is easily achieved. The last part of the thesis is devoted to extending the MOCSP for a high call rate and includes a preliminary comparative analysis. This analysis depends on four factors - scalability limit, complexity level, needed computing resources and session setup latency - that are considered to specify the scalability of the signaling layer. The preliminary analysis clearly shows that the MOCSP based solution is simple and has potential for improving the effective usage of computing resources over the traditional communication systemsEVRY-INT (912282302) / SudocSudocFranceF

    COIN : a customisable, incentive driven video on demand framework for low-cost IPTV services

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    There has been a significant rise in the provision of television and video services over IP (IPTV) in recent years. Increasing network capacity and falling bandwidth costs have made it both technically and economically feasible for service providers to deliver IPTV services. Several telecommunications (telco) operators worldwide are rolling out IPTV solutions and view IPTV as a major service differentiator and alternative revenue source. The main challenge that IPTV providers currently face, however, is the increasingly congested television service provider market, which also includes Internet Television. IPTV solutions therefore need strong service differentiators to succeed. IPTV solutions can doubtlessly sell much faster if they are more affordable or low-cost. Advertising has already been used in many service sectors to help lower service costs, including traditional broadcast television. This thesis therefore explores the role that advertising can play in helping to lower the cost of IPTV services and to incentivise IPTV billing. Another approach that IPTV providers can use to help sell their product is by addressing the growing need for control by today's multimedia users. This thesis will therefore explore the varied approaches that can be used to achieve viewer focused IPTV implementations. To further lower the cost of IPTV services, telcos can also turn to low-cost, open source platforms for service delivery. The adoption of low-cost infrastructure by telcos can lead to reduced Capital Expenditure (CAPEX), which in turn can lead to lower service fees, and ultimately to higher subscriptions and revenue. Therefore, in this thesis, the author proposes a CustOmisable, INcentive (COIN) driven Video on Demand (VoD) framework to be developed and deployed using the Mobicents Communication Platform, an open source service creation and execution platform. The COIN framework aims to provide a viewer focused, economically competitive service that combines the potential cost savings of using free and open source software (FOSS), with an innovative, incentive-driven billing approach. This project will also aim to evaluate whether the Mobicents Platform is a suitable service creation and execution platform for the proposed framework. Additionally, the proposed implementation aims to be interoperable with other IPTV implementations, hence shall follow current IPTV standardisation architectures and trends. The service testbed and its implementation are described in detail and only free and open source software is used; this is to enable its easy duplication and extension for future research.TeX output 2012.03.02:1241Adobe Acrobat 9.2 Paper Capture Plug-i

    Contributions to presence-based systems for deploying ubiquitous communication services

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    Next-Generation Networks (NGNs) will converge the existing fixed and wireless networks. These networks rely on the IMS (IP Multimedia Subsystem), introduced by the 3GPP. The presence service came into being in instant messaging applications. A userÂżs presence information consists in any context that is necessary for applications to handle and adapt the user's communications. The presence service is crucial in the IMS to deploy ubiquitous services. SIMPLE is the standard protocol for handling presence and instant messages. This protocol disseminates users' presence information through subscriptions, notifications and publications. SIMPLE generates much signaling traffic for constantly disseminating presence information and maintaining subscriptions, which may overload network servers. This issue is even more harmful to the IMS due to its centralized servers. A key factor in the success of NGNs is to provide users with always-on services that are seamlessly part of their daily life. Personalizing these services according to the users' needs is necessary for the success of these services. To this end, presence information is considered as a crucial tool for user-based personalization. This thesis can be briefly summarized through the following contributions: We propose filtering and controlling the rate of presence publications so as to reduce the information sent over access links. We probabilistically model presence information through Markov chains, and analyzed the efficiency of controlling the rate of publications that are modeled by a particular Markov chain. The reported results show that this technique certainly reduces presence overload. We mathematically study the amount of presence traffic exchanged between domains, and analyze the efficiency of several strategies for reducing this traffic. We propose an strategy, which we call Common Subscribe (CS), for reducing the presence traffic exchanged between federated domains. We compare this strategy traffic with that generated by other optimizations. The reported results show that CS is the most efficient at reducing presence traffic. We analyze the load in the number of messages that several inter-domain traffic optimizations cause to the IMS centralized servers. Our proposed strategy, CS, combined with an RLS (i.e., a SIMPLE optimization) is the only optimization that reduces the IMS load; the others increase this load. We estimate the efficiency of the RLS, thereby concluding that the RLS is not efficient under certain circumstances, and hence this optimization is discouraged. We propose a queuing system for optimizing presence traffic on both the network core and access link, which is capable to adapt the publication and notification rate based on some quality conditions (e.g, maximum delay). We probabilistically model this system, and validate it in different scenarios. We propose, and implement a prototype of, a fully-distributed platform for handling user presence information. This approach allows integrating Internet Services, such as HTTP or VoIP, and optimizing these services in an easy, user-personalized way. We have developed SECE (Sense Everything, Control Everything), a platform for users to create rules that handle their communications and Internet Services proactively. SECE interacts with multiple third-party services for obtaining as much user context as possible. We have developed a natural-English-like formal language for SECE rules. We have enhanced SECE for discovering web services automatically through the Web Ontology Language (OWL). SECE allows composing web services automatically based on real-world events, which is a significant contribution to the Semantic Web. The research presented in this thesis has been published through 3 book chapters, 4 international journals (3 of them are indexed in JCR), 10 international conference papers, 1 demonstration at an international conference, and 1 national conferenceNext-Generation Networks (NGNs) son las redes de prĂłxima generaciĂłn que soportaran la convergencia de redes de telecomunicaciĂłn inalĂĄmbricas y fijas. La base de NGNs es el IMS (IP Multimedia Subsystem), introducido por el 3GPP. El servicio de presencia naciĂł de aplicaciones de mesajerĂ­a instantĂĄnea. La informaciĂłn de presencia de un usuario consiste en cualquier tipo de informaciĂłn que es de utilidad para manejar las comunicaciones con el usuario. El servicio de presencia es una parte esencial del IMS para el despliegue de servicios ubicuos. SIMPLE es el protocolo estĂĄndar para manejar presencia y mensajes instantĂĄneos en el IMS. Este protocolo distribuye la informaciĂłn de presencia de los usuarios a travĂ©s de suscripciones, notificaciones y publicaciones. SIMPLE genera mucho trĂĄfico por la diseminaciĂłn constante de informaciĂłn de presencia y el mantenimiento de las suscripciones, lo cual puede saturar los servidores de red. Este problema es todavĂ­a mĂĄs perjudicial en el IMS, debido al carĂĄcter centralizado de sus servidores. Un factor clave en el Ă©xito de NGNs es proporcionar a los usuarios servicios ubicuos que esten integrados en su vida diaria y asi interactĂșen con los usuarios constantemente. La personalizaciĂłn de estos servicios basado en los usuarios es imprescindible para el Ă©xito de los mismos. Para este fin, la informaciĂłn de presencia es considerada como una herramienta base. La tesis realizada se puede resumir brevemente en los siguientes contribuciones: Proponemos filtrar y controlar el ratio de las publicaciones de presencia para reducir la cantidad de informaciĂłn enviada en la red de acceso. Modelamos la informaciĂłn de presencia probabilĂ­sticamente mediante cadenas de Markov, y analizamos la eficiencia de controlar el ratio de publicaciones con una cadena de Markov. Los resultados muestran que este mecanismo puede efectivamente reducir el trĂĄfico de presencia. Estudiamos matemĂĄticamente la cantidad de trĂĄfico de presencia generada entre dominios y analizamos el rendimiento de tres estrategias para reducir este trĂĄfico. Proponemos una estrategia, la cual llamamos Common Subscribe (CS), para reducir el trĂĄfico de presencia entre dominios federados. Comparamos el trĂĄfico generado por CS frente a otras estrategias de optimizaciĂłn. Los resultados de este anĂĄlisis muestran que CS es la estrategia mĂĄs efectiva. Analizamos la carga en numero de mensajes introducida por diferentes optimizaciones de trĂĄfico de presencia en los servidores centralizados del IMS. Nuestra propuesta, CS, combinada con un RLS (i.e, una optimizaciĂłn de SIMPLE), es la unica optimizaciĂłn que reduce la carga en el IMS. Estimamos la eficiencia del RLS, deduciendo que un RLS no es eficiente en ciertas circunstancias, en las que es preferible no usar esta optimizaciĂłn. Proponemos un sistema de colas para optimizar el trĂĄfico de presencia tanto en el nĂșcleo de red como en la red de acceso, y que puede adaptar el ratio de publicaciĂłn y notificaciĂłn en base a varios parametros de calidad (e.g., maximo retraso). Modelamos y analizamos este sistema de colas probabilĂ­sticamente en diferentes escenarios. Proponemos una arquitectura totalmente distribuida para manejar las informaciĂłn de presencia del usuario, de la cual hemos implementado un prototipo. Esta propuesta permite la integracion sencilla y personalizada al usuario de servicios de Internet, como HTTP o VoIP, asi como la optimizacĂłn de estos servicios. Hemos desarrollado SECE (Sense Everything, Control Everything), una plataforma donde los usuarios pueden crear reglas para manejar todas sus comunicaciones y servicios de Internet de forma proactiva. SECE interactĂșa con una multitud de servicios para conseguir todo el contexto possible del usuario. Hemos desarollado un lenguaje formal que parace como Ingles natural para que los usuarios puedan crear sus reglas. Hemos mejorado SECE para descubrir servicios web automaticamente a travĂ©s del lenguaje OWL (Web Ontology Language)

    A SIP-based Programming Framework for Advanced Telephony Applications

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    International audienceThe scope of telephony is signiïŹcantly broadening, providing users with a variety of communication modes, including presence status, instant messaging and videoconferencing. Furthermore, telephony is being increasingly combined with a number of non-telephony, heterogeneous resources, consisting of software entities, such as Web services, and hardware entities, such as location-tracking devices. This heterogeneity, compounded with the intricacies of underlying technologies, make the programming of new telephony applications a daunting task. This paper proposes an approach to supporting the development of advanced telephony applications. To do so, we introduce a declarative language over Java to deïŹne the entities of a target telephony application area. This deïŹnition is passed to a generator to produce a Java programming framework, dedicated to the application area. The generated frameworks provide service discovery and high-level communication mechanisms. These mechanisms are automatically mapped into SIP, making our approach compatible with existing SIP infrastructures and entities. Our work is implemented and has been validated on various advanced telephony applications

    Communication Web Services and JAIN-SLEE Integration Challenges

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    Meshing up telecommunication and IT resources seems to be the real challenge for supporting the evolution towards the next generation of Web Services. In telecom world, JAIN-SLEE (JAIN Service Logic Execution Environment) is an emerging standard specification for Java service platforms targeted to host value added services, composed of telecom and IT services. In this paper we describe StarSLEE platform which extends JAIN-SLEE in order to compose JAIN-SLEE services with Web services and the StarSCE service creation environment which allows exporting value added services as communication web services, and we analyze open issues that must be addressed to introduce Web Services in new telecom service platforms
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