An Overlay Gateway for the Integration of IP Multimedia Subsystem and Mobile Sink Based-Wireless Sensor Networks

RÉSUMÉ D'une part les Réseaux de Capteurs (WSN par ses sigles en anglais) constituent un domaine de recherche qui a reçu beaucoup d'attention de la part de la communauté scientifique grâce à ses avantages en différents domaines. Chaque réseau est généralement conçu à partir de périphériques de petite taille appelés capteurs qui peuvent capter, effectuer des calculs et communiquer entre eux. De plus, inclure des stations de base mobiles dans les réseaux de capteurs sans fils s'est avéré utile dans une large gamme de scénarios puisque ces derniers permettent d'améliorer la durée de vie globale du réseau et d'augmenter la capacité de transmission de données. D'autre part, le sous-système IP Multimédia (IMS) vise à fournir un accès aux réseaux cellulaires à l'ensemble des services Internet. Il s'agit d'une surcouche de contrôle implantée sur une couche IP dont les objectifs sont de fournir et maintenir une qualité de service (QoS) donnée, un schéma de chargement équitable et des services intégrés; le tout en utilisant des interfaces standards. Combiner les fonctionnalités d‟IMS et l‟ensemble d'informations contextuelles capturées par les stations de base des réseaux de capteurs sans fils ouvre la porte à une nouvelle gamme de services multimédias. Cette dissertation propose une architecture de surcouche pour l'intégration des IMS avec les réseaux de capteurs sans fils. Le service "présence" sert de point d'entrée au domaine des IMS. La passerelle, qui constitue le coeur de notre architecture, est une couche de recouvrement construite sur les mêmes téléphones mobiles qui agissent également en tant que canaux mobiles, publicateurs / écouteurs de présence et périphériques utilisateurs. ----------ABSTRACT On one hand, Wireless Sensor Networks (WSNs) are a research area that has been gaining attention from the research community. They are made up of small scale devices called sensors that can sense, compute and communicate. Moreover, including mobile sinks in WSNs has shown to be useful in a wide range of scenarios since they can improve the overall network lifetime and increase data capacity. On the other hand, the IP Multimedia Subsystem (IMS) aims to provide cellular access to all Internet services. It is an overlay control layer on top of an IP layer whose goals is based in provisioning of Quality of Service (QoS), a fair charging scheme and integrated services through standard interfaces. Combining the capabilities of IMS with the rich set of contextual information captured by mobile sink WSNs opens the door to a wide range of novel multimedia services. This dissertation proposes an overlay architecture for the integration of IMS with mobile sink-based WSN. The Presence service is used as entry point to the IMS world. The gateway which is the heart of our architecture is an overlay built on top of the very same mobile phones that act as mobile sinks, presence publishers / watchers, and end-user devices

Integrating Wireless Sensor Networks and Mobile Ad-hoc NETworks for enhanced value-added services

In some situations where the standard telecommunication infrastructure is not available, Mobile Ad hoc NETworks (MANETs) can be deployed to provide the required communication. These networks are established "on the fly" without a need for prior communication organization and are composed of autonomous mobile devices, such as cell phones, PDAs or laptops. In similar conditions, such as in emergency response operations, integrating MANETs and Wireless Sensor Networks (WSNs) can notably enhance the MANET participant's end-user experience. WSNs sense and aggregate ambient information, such as physiological, environmental or physical data related to a nearby phenomenon. The integration, which provides end-user availability to WSN required information, is feasible via gateways. However, when the ambient information collected by WSNs is intended for applications residing in MANETs, centralized and fixed gateways are not practicably feasible. This is mainly due to ad-hoc nature, lack of centralized control and constraints on the end-user devices that are used in MANETs. These devices are usually limited in power and capacity and cannot host centralized gateways. In this thesis we exploit the integration of WSN and MANET in order to provide novel value-added services which enhance the end-user experience of MANET participants. Motivating scenarios are introduced, background information is presented, requirements are derived and the state of the art regarding the integration of WSN with existing networks, including MANETs, is evaluated. Based on the evaluation, none of the existing solutions satisfies all of our derived requirements. Therefore, we propose an overall two-level overlay architecture to integrate WSNs (with mobile sinks) and MANETs. This architecture is based on the distributed gateway and applications which form the P2P overlays. Overlays are application-layer networks which are created on top of the exiting MANET. To interconnect gateway and application overlays we derive corresponding requirements and evaluate the existing approaches. Since none of these approaches fulfills all of our requirements, we propose protocols, mechanisms and design corresponding modules for the interconnection of overlays. Finally we refine our overall architecture based on the interconnection aspects. As a proof of concept, we implement a prototype for the inter-overlay information exchange. This implementation is based on SIP extensions and uses two existing P2P middlewares. We also simulate our prototype using Oversim simulation tool and collect experimental results. Based on these results, we can see that our architecture is a valid and promising approach for interconnecting different P2P overlays and can be deployed to provide the overall solution for WSN and MANET integrated system

The operator's response to P2P service demand

Peer-to-peer (P2P) systems are in high demand for all sorts of tasks-video communication, resource sharing, and content retrieval, to mention a few. However, current P2P solutions are intrinsically incompatible with the IP multimedia subsystem (IMS), the service provisioning framework adopted by the major telecommunication players. We look at ways to develop P2P applications over IMS, identifying the essential service components that pave the way toward interoperable P2P. We discuss the added value that a P2P-IMS solution offers to all parties involved in the service provisioning chain: content provider, third-party service provider, network operator, and ultimately, the user. P2P-IMS brings the power of P2P (increased scalability, availability, resilience, and resource utilization) to the future domain of services, creating a wealth of new business opportunities. Our findings are supported by an IMS-compliant prototype, including a variety of applications