Distributed control architecture for multiservice networks

The research focuses in devising decentralised and distributed control system architecture for the management of internetworking systems to provide improved service delivery and network control. The theoretical basis, results of simulation and implementation in a real-network are presented. It is demonstrated that better performance, utilisation and fairness can be achieved for network customers as well as network/service operators with a value based control system. A decentralised control system framework for analysing networked and shared resources is developed and demonstrated. This fits in with the fundamental principles of the Internet. It is demonstrated that distributed, multiple control loops can be run on shared resources and achieve proportional fairness in their allocation, without a central control. Some of the specific characteristic behaviours of the service and network layers are identified. The network and service layers are isolated such that each layer can evolve independently to fulfil their functions better. A common architecture pattern is devised to serve the different layers independently. The decision processes require no co-ordination between peers and hence improves scalability of the solution. The proposed architecture can readily fit into a clearinghouse mechanism for integration with business logic. This architecture can provide improved QoS and better revenue from both reservation-less and reservation-based networks. The limits on resource usage for different types of flows are analysed. A method that can sense and modify user utilities and support dynamic price offers is devised. An optimal control system (within the given conditions), automated provisioning, a packet scheduler to enforce the control and a measurement system etc are developed. The model can be extended to enhance the autonomicity of the computer communication networks in both client-server and P2P networks and can be introduced on the Internet in an incremental fashion. The ideas presented in the model built with the model-view-controller and electronic enterprise architecture frameworks are now independently developed elsewhere into common service delivery platforms for converged networks. Four US/EU patents were granted based on the work carried out for this thesis, for the cross-layer architecture, multi-layer scheme, measurement system and scheduler. Four conference papers were published and presented

Sobrevivência das redes de transporte da nova geração

Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia de Electrónica e TelecomunicaçõesA presente dissertação tem como principal objectivo estudar os vários tipos de esquemas de sobrevivência em redes ópticas de alta capacidade, designadamente em redes WDM (Wavelenth Division Multiplexing). Para tal, foi efectuada inicialmente uma revisão da literatura, a qual se encontra estruturada em duas etapas. Primeiro é apresentada uma visão global das redes ópticas de transporte com destaque para evolução das redes WDM e seus componentes. De seguida, são apresentadas as técnicas de sobrevivência em NGNs (Next Generation Networks). Depois de uma breve exposição de conceitos, são apresentadas as técnicas mais importantes no que diz respeito aos esquemas de protecção e restauro em redes de transporte de alta capacidade. São também abordados os Planos de Controlo, Dados e Gestão do GMPLS (Generalized Multiprotocol Label Switching) no contexto da sobrevivência das NGNs. Com recurso a um modelo de simulação de redes WDM, baseado no simulador de redes ns-3, são analisados três cenários de falha. São eles, falha num link, falha em múltiplos links e falha num nó. Assim, foi possível verificar o comportamento do algoritmo RWA (Routing and Wavelength Assignment), na ocorrência de uma falha. O algoritmo RWA permitiu, nos três cenários de falha analisados, reencaminhar os canais para um caminho alternativo, e desta forma assegurar a continuidade da transmissão.This thesis aims to study the various types of survival schemes in highcapacity optical networks, in particularly in WDM networks (Wavelenth Division Multiplexing). This was done initially carried out a literature review, which is structured in two stages. First is shown an overview of optical transport networks highlighted the evolution of WDM networks and its network components. Then, an overview of the survivable techniques in NGNs (Next Generation Networks) is shown. After a brief concepts exposure are shown the most important techniques in regard to the protection and restoration schemes for high capacity transmission systems. They are also addressed the Control Plane, Data Plane and Management Plane of GMPLS (Generalized Multiprotocol Label Switching) in the context of survivability of NGN. Using a WDM network simulation model, based on ns-3, are analyzed three failure scenarios. They are, single-link failure, multiple-link failure and node failure. Thus, it was possible to verify the behavior of the RWA algorithm (Routing and Wavelength Assignment), in such event of failure. The RWA algorithm have allowed in the three failure scenarios, rerouting the channels to an alternate path, and thus ensures the continuity of transmission

Sobrevivência das redes de transporte da nova geração

Trabalho Final de Mestrado para obtenção do grau de Mestre em Engenharia de Electrónica e TelecomunicaçõesA presente dissertação tem como principal objectivo estudar os vários tipos de esquemas de sobrevivência em redes ópticas de alta capacidade, designadamente em redes WDM (Wavelenth Division Multiplexing). Para tal, foi efectuada inicialmente uma revisão da literatura, a qual se encontra estruturada em duas etapas. Primeiro é apresentada uma visão global das redes ópticas de transporte com destaque para evolução das redes WDM e seus componentes. De seguida, são apresentadas as técnicas de sobrevivência em NGNs (Next Generation Networks). Depois de uma breve exposição de conceitos, são apresentadas as técnicas mais importantes no que diz respeito aos esquemas de protecção e restauro em redes de transporte de alta capacidade. São também abordados os Planos de Controlo, Dados e Gestão do GMPLS (Generalized Multiprotocol Label Switching) no contexto da sobrevivência das NGNs. Com recurso a um modelo de simulação de redes WDM, baseado no simulador de redes ns-3, são analisados três cenários de falha. São eles, falha num link, falha em múltiplos links e falha num nó. Assim, foi possível verificar o comportamento do algoritmo RWA (Routing and Wavelength Assignment), na ocorrência de uma falha. O algoritmo RWA permitiu, nos três cenários de falha analisados, reencaminhar os canais para um caminho alternativo, e desta forma assegurar a continuidade da transmissão.This thesis aims to study the various types of survival schemes in highcapacity optical networks, in particularly in WDM networks (Wavelenth Division Multiplexing). This was done initially carried out a literature review, which is structured in two stages. First is shown an overview of optical transport networks highlighted the evolution of WDM networks and its network components. Then, an overview of the survivable techniques in NGNs (Next Generation Networks) is shown. After a brief concepts exposure are shown the most important techniques in regard to the protection and restoration schemes for high capacity transmission systems. They are also addressed the Control Plane, Data Plane and Management Plane of GMPLS (Generalized Multiprotocol Label Switching) in the context of survivability of NGN. Using a WDM network simulation model, based on ns-3, are analyzed three failure scenarios. They are, single-link failure, multiple-link failure and node failure. Thus, it was possible to verify the behavior of the RWA algorithm (Routing and Wavelength Assignment), in such event of failure. The RWA algorithm have allowed in the three failure scenarios, rerouting the channels to an alternate path, and thus ensures the continuity of transmission

Pour un mécanisme de protection différenciée unique contre la gestion ainsi que les pannes : DiffServ*

L'avènement de l'Internet multiservice met fin à l'ère du réseautage de nature meilleur effort. Cette nouvelle caractéristique est très souhaitable et prometteuse sur plusieurs plans mais elle reste sujette à la capacité du réseau de protéger chaque catégorie de trafic selon sa priorité et ses exigences en qualité de service. Quand le réseau est déployé sur une infrastructure optique, une des préoccupations des plus importantes est sa capacité de survie et le maintien d'un service adéquat à toutes les applications suite à une panne physique. Nous savons qu'une simple coupure de fibre provoque des pertes énormes en capacité de transmission et si laissée sans surveillance, elle peut causer des dégradations majeures dans la qualité de service perçue par les usagers du réseau. Bien qu'il existe déjà des mécanismes de protection physique qui sont conçus spécifiquement pour remédier à de telles situations, ces options sont généralement très coûteuses et difficilement adaptable aux besoins variés de chaque classe de trafic d'un réseau multiserviceNous proposons alors un modèle innovateur de protection différenciée du trafic, DiffServ*, qui permet de répondre aux exigences particulières en qualité de service et de protection de chacune des classes de trafic et qui introduit une robustesse accrue et des économies importantes en matière d'utilisation de ressources d'un réseau IP/WDM. DiffServ* se distingue par l'utilisation combinée de l'architecture des services différenciées à la couche logique d'un réseau et de la technique d'agrégation de liens ou canaux disjoints à sa couche physiqueNotre modèle de protection différenciée du trafic en cas de pannes a été soumis à l'épreuve, nous avons utilisé la simulation pour étudier sa performance et nous l'avons comparé à un modèle de protection physique homologue, DiffProtect. Les résultats montrent que DiffServ* permet en moyenne de garantir une meilleure protection que DiffProtect en cas de pannes simples et multiples. DiffProtect n'est plus performant que dans certaines situations de pannes et de trafic très particulières. Une évaluation subséquente de la fiabilité d'un réseau qui utilise DiffServ*, une étude de coût de son déploiement et une étude de cas qui cible les réseaux MPLS-DiffServ TE confirment davantage la supériorité de DiffServ* par rapport à tout autre option de protection différenciée envisageableNous rappelons que DiffServ* se base sur les techniques de différenciation de service de la couche logique pour protéger le trafic en cas de pannes de composantes optiques. Ceci est inédit puisque ces mêmes techniques sont originalement conçues que pour protéger le trafic en cas de congestion dans la couche logique. Alors pour démontrer définitivement que DiffServ* est réalisable et fonctionnel nous réalisons une expérience de déploiement pratique de DiffServ* en laboratoire à l'aide d'équipements de communication réel. Malgré les divergences techniques entre la modélisation théorique de DiffServ* et de son implémentation, DiffServ* est démontré performant, fiable, économique et réalisable en pratiqueNous clôturons ce projet par une planification de déploiement ; cette dernière permet de généraliser le déploiement de DiffServ* à toute topologie IP/WDM et d'en dimensionner la couche logique. Notre procédure approche les situations qui requièrent la fiabilité spécifique de DiffProtect en offrant un modèle d'optimisation complet sur le déploiement de la protection MixProtect multicouche qui utilise DiffServ* et DiffProtect dans le même résea