Dynamic Bandwidth Allocation Algorithms for Differentiated Services enabled Ethernet Passive Optical Networks with Centralized Admission Control

Fiber based access networks can deliver performance that can support the in­ creasing demands for high speed connections. One of the new technologies that has emerged in recent years is Ethernet Passive Optical Networks. The key fea­ tures of this approach are the simplicity of the architecture and compatibility with existing Ethernet based local area networks. To make Ethernet Passive Optical Networks (EPONs) a fully functional part of the telecommunication system, support for classes of traffic with different Qual­ ity of Service (QoS) requirements is mandatory. Much research has been done on the optimal bandwidth allocation algorithms that would have the capability of supporting Differentiated Services (DiffServ) in EPONs. This thesis proposes that the access control mechanism should be centralized and performed by the Optical Line Terminal (OLT). It is shown that this ap­ proach can give greater flexibility to adjust to changing traffic conditions, can simplify the structure of the Optical Network Units, and can allow the easy adoption of Service Level Agreements. This thesis introduces a novel EPON simulator that allows testing of various types of bandwidth allocation algorithms. It is possible to evaluate the alloca­ tion mechanism under different traffic conditions and with network configura­ tions that closely resemble real systems. New algorithms are presented based on a paradigm of centralized access con­ trol. Simulation results showed that they offer good performance and support for the DiffServ architecture. List of Publications • Dawid Nowak and John M urphy, "Fiber to the Home: C om parison of C urrent System A rchitectures." in Proceedings of Optolreland, Apr. 2005. • Dawid Nowak, John M urphy, and Philip Perry, "B andw idth Allocation for Ser­ vice Level A greem ent A w are E thernet Passive Optical N etw orks," in Proceedings ofGLOBECOM Global Telecommunications Conference, Dec. 2004, vol. 3, pp. 19531957 • Dawid Nowak, John M urphy, and Philip Perry, "A daptive Dynamic B andw idth Allocation A lgorithm for E thernet PONs," in Proceedings of 30th European Confer­ ence on Optical Communication, Sept. 2004, vol. 3, pp. 740-741. • Dawid Nowak, John M urphy, and Philip Perry, "A novel Service Level Agree­ m ent based algorithm for D ifferentiated Services enabled Ethernet PONs," in Proceedings of OptoElectronics and Communications Conference/International Confer­ ence on Optical Internet, 2004, vol. 1, pp. 598-599. • Dawid Nowak, John M urphy, and Philip Perry, "B andw idth Scheduling Techniques for D ifferentiated Services Support in E thernet Passive Opticacl N etw orks," in Proceedings of 4th International Symposium on Communication Sys­ tems, Networks and Digital Signal Processing, 2004, vol. 1, pp. 67-70. • Dawid Nowak and Bartlomiej Klusek, "Analysis of W aveband Connecting Prob­ ability in H ybrid Optical N etw orks," in Proceedings of 2nd IFIP-TC6 International Conference on Optical Communications and Networks, Oct. 2003. LIST OF PUBLICATIONS • Dawid Nowak, Bartfomiej Khisek, and Tommy C urran , "N ew M ethod for Calcu­ lating Probability of W aveband C onnection in All Optical N etw orks/' in Proceed­ ings oflEIflEE Telecommunications System Research Symposium , M ay 2003. • Bartlomiej Klusek, Dawid Nowak, and Tommy C urran, "W avelength A ssignm ent A lgorithm s in an OBS N ode," in Proceedings oflEI/IEE Telecommunications System Research Symposium , M ay 2003. • Dawid Nowak and Tommy C urran, "Sim ulation of a Signalling C hannel on Top of DiffServ N etw orks," in Proceedings oflEI/IEE Telecommunications System Research Symposium , Nov. 2001.