Novel management strategies for dynamic provisioning and monitoring in all-optical, control plane enabled metro ip/wdm networks

• Autores: Carolina Pinart Gilberga
• Directores de la Tesis: Gabriel Junyent Giralt (dir. tes.)
• Lectura: En la Universitat Politècnica de Catalunya (UPC) ( España ) en 2005
• Idioma: español
• Tribunal Calificador de la Tesis: Josep Solé Pareta (presid.), Jaume Comellas Colome (secret.), Raul Muñoz González (voc.)
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• Resumen

  • In this thesis we study novel management strategies for future communication networks based on concepts and technologies that allow for dynamic provisioning and monitoring of transparent lambda services supported by advanced transparent technologies and optical intelligence. Transparent optical networks have no opto-electronic conversions, and are independent of the payload and format of the traffic transported. Optical intelligence aims at automating network functions and its most extended flavor is the control plane. In an intelligent, service-aware context, rapid provisioning is possible, and efficient monitoring is crucial to realize resource-related automatic functions and to assure service quality. We take advantage of the optical control plane, methods for non-intrusive monitoring of transparent data services, and flexible technologies for management. The control plane represents a set of functions and interconnection mechanisms that allow for unified communication, routing and control across disparate types of underlying transport technologies. Optical Performance Monitoring has been discussed since the early 1990s and the term itself has taken on multiple definitions. In this thesis, we adopt a broad definition of OPM: physical layer monitoring of the signal quality, i.e., for the purpose of determining the health of the signal in the optical domain. As for technologies and concepts for flexible management, user-empowered networks are becoming a reality due to the access to dark fiber. Moreover, the multi-purpose technology of SOAP/XML allows flexible, universal interfacing with users for dynamic service provisioning.

    In the context of lambda service provisioning, this thesis models and assesses a three-layer distributed management plane. Both evolutionary and revolutionary trends are taken into account in order to provide smooth migration from current operator-owned networks and to integrate new players. Distribution and decentralization are key, as it is cross-plane interworking. The strategies proposed are based on three pillars: distribution of connection requests, decentralization of the management system and efficient function allocation and decentralization of management information. Analytical and experimental results confirm low complexity and great flexibility through setup delays (far below 1 sec), a crucial service-intrinsic SLA parameter. The decentralization of the management system has also been proven through peering strategies in the management system, both in the cooperative architecture and in the inter-management-system interface.

    Introducing transparency in optical networks results in a lack of electrical signal regeneration; physical impairments accumulate. Future services are expected to be QoS enabled, which leads to the need for accurate in-service performance monitoring. This thesis designs and assesses an in-service monitoring system that can verify the quality of transparent lambda services non-intrusively. This system also provides up-to-date information about link status for impairment-aware RWA. To this end, 'all-optical' SLAs (layers 1 and 3 metrics) are proposed that can be measured in msec-sec order. The system is distributed, modular and low-complexity, and performs real-time validation: 100 SLAs in 800 msec, link-state update in 400 msec.

    Finally, this thesis has implemented these strategies in an ASON/GMPLS setting. The management infrastructure is a distributed optical management system, which combines SNMP and SOAP/XML over the innovative .NET framework, SNMP management controllers embedded in control plane nodes, and an in-service, non-intrusive performance monitoring system. These elements are combined with commercial equipment (transport monitors and BER tester), and with testbed's control (GMPLS) and transport (all-optical DWDM). The infrastructure implemented serves to validate experimentally the strategies proposed in this thesis both for provisioning and monitoring, and has provided valuable hands-on experience on the intricacies of optical network management, and the suitability of chosen technologies.