The current prospects in wired and wireless access networks, it is becoming increasingly important to address potential convergence in order to offer integrated broadband services. These systems will need to offer higher data transmission capacities and long battery life, which is the catalyst for an everincreasing variety of air interface technologies targeting local area to wide area connectivity. Current integrated industrial networks do not offer application aware context delivery and enhanced services for optimised networks. Application aware services provide value-added functionality to business applications by capturing, integrating, and consolidating intelligence about users and their endpoint devices from various points in the network. This thesis mainly intends to resolve the issues related to ubiquitous application aware service, fair allocation of radio access, reduced energy consumption and improved capacity. A technique that measures and evaluates the data rate demand to reduce application response time and queuing delay for multi radio interfaces is proposed. The technique overcomes the challenges of network integration, requiring no user intervention, saving battery life and selecting the radio access connection for the application requested by the end user. This study is split in two parts. The first contribution identifies some constraints of the services towards the application layer in terms of e.g. data rate and signal strength. The objectives are achieved by application controlled handover (ACH) mechanism in order to maintain acceptable data rate for real-time application services. It also looks into the impact of the radio link on the application and identifies elements and parameters like wireless link quality and handover that will influence the application type. It also identifies some enhanced traditional mechanisms such as distance controlled multihop and mesh topology required in order to support energy efficient multimedia applications. The second contribution unfolds an intelligent application priority assignment mechanism (IAPAM) for medical applications using wireless sensor networks. IAPAM proposes and evaluates a technique based on prioritising multiple virtual queues for the critical nature of medical data to improve instant transmission. Various mobility patterns (directed, controlled and random waypoint) has been investigated and compared by simulating IAPAM enabled mobile BWSN. The following topics have been studied, modelled, simulated and discussed in this thesis: 1. Application Controlled Handover (ACH) for multi radios over fibre 2. Power Controlled Scheme for mesh multi radios over fibre using ACH 3. IAPAM for Biomedical Wireless Sensor Networks (BWSN) and impact of mobility over IAPAM enabled BWSN. Extensive simulation studies are performed to analyze and to evaluate the proposed techniques. Simulation results demonstrate significant improvements in multi radios over fibre performance in terms of application response delay and power consumption by upto 75% and 15 % respectively, reduction in traffic loss by upto 53% and reduction in delay for real time application by more than 25% in some cases.

By exploiting context awareness, traditional applications can be extended to offer better quality or new functions. Utilizing a context-aware infrastructure, a variety of context information is merged and processed to produce information that is useful to applications. Applications exploiting such context can provide more intelligent and creative services to end users. This thesis examines two ways to make use of a user’s location along with room occupancy information in context aware applications: a Context Agent and a Call Secretary. In the former case, the application subscribes to room occupancy information via a context server, and provides a Meeting Room Booking System with “real-time” information about the utilization of the rooms which the room booking system is to manage. The Call Secretary acquires both location and room occupancy information from a server. When the user is in one of the meeting rooms and multiple people are present, then this is interpreted as the user being in a meeting -- therefore it triggers a CPL module in a SIP proxy to redirect the user’s incoming call to their voice mail box. A description of the implementation of these two applications will be presented along with an evaluation of these applications’ performance. The evaluation of the Context Agent showed that it was straightforward to integrate information from a presence source and to extend the meeting room booking system to use this information. The Call Secretary needs a more reliable source for the user's location. However, given this location the Call Secretary provides the service which the user expects. / Genom att utnyttja sammanhang medvetenhet, traditionella tillämpningar kan utvidgas till att erbjuda bättre kvalitet eller nya funktioner. Använda en kontextmedvetna infrastruktur, en rad olika kontextuppgifter är sammanslagna och bearbetas för att producera information som är användbar för tillämpningar. Tillämpningar som utnyttjar sådana sammanhang kan ge mer intelligenta och kreativa tjänster till slutanvändare. Denna avhandling undersöker två sätt att använda sig av ett användaren befinner sig längs med rummet beläggningen information i samband medveten program: ett sammanhang av ombud och en uppmaning Sekreterare. I det förra fallet skall ansökan under på rumspris information via ett sammanhang server, och ger ett mötesrum bokningssystem med "realtid" information om användningen av de rum som lokalbokning system är att hantera. Ring sekreterare förvärvar både plats och rumspris information från en server. När användaren är i en av konferenslokaler och flera människor är närvarande, så är det tolkas som att användarna är i ett möte - därför det utlöser en CPL-modul i en SIP-proxy för att dirigera om användarens inkommande samtal till deras telefonsvarare fält. En beskrivning av genomförandet av dessa två program kommer att presenteras tillsammans med en utvärdering av dessa ansökningar resultat. Utvärderingen av det sammanhang ombud visade att det var enkelt att integrera information från en närvaro källa och att utvidga mötesrum bokningssystem att använda denna information. Ring sekreterare behöver en mer tillförlitlig källa för användarens plats. Med tanke på denna plats för samtal sekreterare tillhandahåller tjänster som användaren förväntar sig.

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Aplicações ubíquas e pervasivas são cientes do contexto dos recursos utilizados no que diz respeito à disponibilidade e qualidade. Esta classe de aplicações pode se beneficiar de mecanismos para descobrir recursos que atendam aos requisitos não-funcionais desejados, e mecanismos para monitorar a qualidade destes recursos. Neste trabalho é proposta uma arquitetura para dois serviços que deveriam ser incluídos na infra-estrutura de suporte a ser utilizada pelas aplicações mencionadas: um Serviço de Contexto, que provê acesso a informações de contexto, e um Serviço de Descoberta, que permite a descoberta dinâmica de recursos, levando em conta restrições de contexto a serem satisfeitas. Estes serviços se apóiam em Agentes de Recursos, que efetivamente monitoram os recursos e sensores. Uma implementação de referência foi desenvolvida, oferecendo os serviços mencionados na forma de Serviços Web e implementando os Agentes de Recursos empregando um padrão de projeto simples. Para avaliar os serviços estes foram utilizados como infra-estrutura para o desenvolvimento de um sistema tolerante a falhas e uma aplicação de assistência domiciliar remota (tele-saúde). O desempenho dos serviços também foi avaliado. / Ubiquitous and pervasive applications are aware of the context of the used resources, regarding their availability and quality. This class of application can benefit from mechanisms to discover resources that meet their non-functional requirements and mechanisms to monitor the quality of those resources. We proposed architecture for two services that should be included in the supporting infrastructure used by the mentioned applications: a Context Service that provides access to context information; and a Discovery Service, which allows the dynamic discovery of resources, considering context constraints to be satisfied. These services rely on Resource Agents, which monitor the actual resources and sensors. A reference implementation was developed, providing the mentioned services as Web Services and implementing the Resource Agents using a simple design pattern. To evaluate these services were employed them as the infrastructure to design a fault tolerant system and a remote assisted living application. The performance of the services was also evaluated.

Aplicações ubíquas e pervasivas são cientes do contexto dos recursos utilizados no que diz respeito à disponibilidade e qualidade. Esta classe de aplicações pode se beneficiar de mecanismos para descobrir recursos que atendam aos requisitos não-funcionais desejados, e mecanismos para monitorar a qualidade destes recursos. Neste trabalho é proposta uma arquitetura para dois serviços que deveriam ser incluídos na infra-estrutura de suporte a ser utilizada pelas aplicações mencionadas: um Serviço de Contexto, que provê acesso a informações de contexto, e um Serviço de Descoberta, que permite a descoberta dinâmica de recursos, levando em conta restrições de contexto a serem satisfeitas. Estes serviços se apóiam em Agentes de Recursos, que efetivamente monitoram os recursos e sensores. Uma implementação de referência foi desenvolvida, oferecendo os serviços mencionados na forma de Serviços Web e implementando os Agentes de Recursos empregando um padrão de projeto simples. Para avaliar os serviços estes foram utilizados como infra-estrutura para o desenvolvimento de um sistema tolerante a falhas e uma aplicação de assistência domiciliar remota (tele-saúde). O desempenho dos serviços também foi avaliado. / Ubiquitous and pervasive applications are aware of the context of the used resources, regarding their availability and quality. This class of application can benefit from mechanisms to discover resources that meet their non-functional requirements and mechanisms to monitor the quality of those resources. We proposed architecture for two services that should be included in the supporting infrastructure used by the mentioned applications: a Context Service that provides access to context information; and a Discovery Service, which allows the dynamic discovery of resources, considering context constraints to be satisfied. These services rely on Resource Agents, which monitor the actual resources and sensors. A reference implementation was developed, providing the mentioned services as Web Services and implementing the Resource Agents using a simple design pattern. To evaluate these services were employed them as the infrastructure to design a fault tolerant system and a remote assisted living application. The performance of the services was also evaluated.

L’objectif de cette thèse est d’apporter une réponse à la problématique d’adaptation automatique et dynamique des services numériques au sein des réseaux du futur (NGN). Pour cela, notre contribution s’articule autour d’un intergiciel qui prend en charge les fonctions de gestion du contexte pour les services numériques ; ceci pour permettre l’émergence de services numériques sensibles au contexte dans les réseaux du futur. L’originalité de ces travaux dans les NGN se situe dans le modèle de conception pour des services numériques sensibles au contexte où l’on découple la logique métier du service numérique de la logique de gestion du contexte. Plus spécifiquement nous définissons la notion de signature de contexte, propre à chaque service numérique, qui permet d’identifier les situations d’usage du service numérique et accompagne l’intergiciel dans le choix de la modalité d’exécution la plus performante. Elle est liée au service numérique sensible au contexte dès sa conception. Lors du déploiement du service dans le serveur d’applications, la signature de contexte est désolidarisée de la logique métier et se voit insérée dans la base de connaissance de l’intergiciel. La signature fait ainsi le lien entre l’intergiciel et le service numérique. Elle permet d’activer l’ensemble des fonctions de traitement du contexte que nous avons modélisées sous la forme d’une chaîne de traitement du contexte. Cette approche assure une séparation des deux logiques qui composent un service numérique sensible au contexte. Les concepteurs de tels services peuvent alors se concentrer sur le développement de la logique métier sans se soucier des fonctions de gestion du contexte / The era of fixed-mobile convergence is imminent, thanks to the Next Generation Network (NGN) paradigm. Such approaches encompass converged networks where users can use any kind of terminals and network access technologies.An utmost issue for NGN is to provide multimodal digital services, since the user’s terminal or network access are expected to change over time during his own session. This means services must be able to shift from one form of service delivery to another according to context updates. We propose to implement context awareness for digital services in NGNs by providing context-awareness to application servers hosted in a NGN. These services running on applications servers (AS) are consumed through a network using the client-server paradigm. In this situation, the context is composed of information about the network and features of the end-user terminal. We explain and implemente a novel architecture that makes AS taking into account the context-awareness of the digital service they host. The architecture employs application ontology in order to monitor the applications’ context. Moreover, when a new context-aware application is deployed on the application server, its context-logic (a set of SWRL rules which rely the domain ontology called context signature) is extracted from the application bundle. Each SWRL rule encodes a context-aware threshold for the application. When a rule is triggered at runtime, the application server notifies the application, so that the application change its service delivery modality, as the current context favors another service delivery modality different than the current one