Tesis doctoral de Jordi Perelló Muntan
The current transport network infrastructure relies on a client-server four-layered approach, remaining the ip layer on top as the convergent technology to seamlessly integrate all emerging heterogeneous services. This transport architecture, however, leads to overlapped functionalities between layers. moreover, a huge overhead is introduced to finally interconnect ip-layer endpoints. Further issues concern its static nature, where leased line provisioning may take hours or days. the automatically switched optical network (ason) architecture has been proposed by the itu-t as an optical transport network architecture with dynamic connection provisioning capabilities. These functionalities are provided by means of a control plane entity that governs the underlying transport plane optical devices. Supposing ason an important advance in network evolution though, the introduction of statistical multiplexing of the resources in the optical layer seems to be a must. In point of fact, due to its coarse granularity and the inherent signaling overhead, optical circuit switching (ocs) may behave very inefficient when supporting higher layer bursty data traffic. optical burst switching (obs) has recently appeared as a promising technology for short to mid-term optical transport networks. Obs granularity lies between those of optical packet switching (ops) and ocs, which provides better adaptation than ocs to higher layer data traffic dynamics, but with more relaxed technological requirements than ops. Nevertheless, obs remains in a research phase and its quality of service (qos) support is still under study. In view of this, hybrid obs/ocs network architectures could be an efficient and cost-effective solution to optical transport networks. In such networks, the smooth traffic flows with high qos requirements would be carried by end-to-end optical circuits, whereas bursty data traffic would be supported on obs. this thesis is devoted to the management of these hybrid obs/ocs networks, aiming at a flexible, resilient and easy-to-maintain network operation. the considered scenario is composed of an underlying ason/gmpls dynamic ocs network, and a client obs network on top. Using ocs layer resources, either end-to-end circuits with qos guarantees or capacity for the obs client layer is provisioned. Therein, it is the task of a network ingress router to, depending on the incoming flow characteristics, choose the most appropriate transport service. after an introduction to the thesis, chapter 2 surveys enabling technologies to next-generation optical transport network deployment. This leads to conclude on the appropriateness of hybrid obs/ocs architectures as a short to mid-term solution to optical transport networks. Next, chapters 3 and 4 focus on the management and resilience of the ocs layer. While chapter 3 presents enabling mechanisms to automatic resource discovery in ason/gmpls networks, chapter 4 concentrates on the resilience of the out-of-fiber control plane in gmpls-controlled networks. In contrast, chapters 5 and 6 on the performance optimization and evaluation of the obs layer. Chapter 5 proposes several contention resolution and avoidance schemes matching service specific qos requirements. Finally, chapter 6 broadens the evaluation of usual contention resolution strategies in obs networks from the network to an application perspective. This gives insight into crucial obs parameters that become significant to supported applications performance, enabling better obs layer design. it shall be mentioned that part of the work reported in this thesis has been done within the framework of several european and national projects, namely ist ip nobel2 (fp6-027305), e-photon/one+ noe (fp6-ist-027497), cost 291 (towards digital optical networks), bone (fp7-216863) and diconet (fp7-216338), founded by the european commission, and the project ringing (tec2005-08051-c03-02) founded by the spanish science ministry.
Datos académicos de la tesis doctoral «Resource management in gmpls-controlled hybrid obs/ocs transport networks«
- Título de la tesis: Resource management in gmpls-controlled hybrid obs/ocs transport networks
- Autor: Jordi Perelló Muntan
- Universidad: Politécnica de catalunya
- Fecha de lectura de la tesis: 19/06/2009
Dirección y tribunal
- Director de la tesis
- Salvatore Spadaro
- Tribunal
- Presidente del tribunal: josep Sole pareta
- Javier Aracil rico (vocal)
- dimitra Simeonidou (vocal)
- davide Careglio (vocal)
