Design and analysis of next generation ethernet-based passive optical access networks

Ethernet Passive Optical Network (EPON) has emerged as an optimized optical next-generation access network that is capable of providing high speed Internet to the ever increasing end-users carrying applications such as, voice communications (VoIP), standard and high-definition video, video conferencing (interactive video) and data traffic, at the minimum cost. However, although standardized, EPON presents network designers with several challenges. In this thesis, we address many of these issues and we propose appropriate solutions that we believe can be adopted by EPON designers. First, we introduce the technologies currently deployed and we motivate our work. Next, we overview the EPON technology along with its related work, and highlights the challenges it carries. Our main contributions start when we investigate the fairness issue in EPON. Here, a new intra-ONU scheduler is presented in order to provide every class of service (CoS) of every ONU with a fair access to the bandwidth allocated by the OLT. We then present the first admission control (AC) framework with all its rules and functionalities along with a new dynamic bandwidth allocation (DBA) designed especially for the application of AC. This framework will resolve the bandwidth guaranteed matter that stems from the lack of QoS flows protection. In our next main contribution, we discuss a possible upgrade of the current time division multiple access (TDMA) PON to a wavelength division multiplexing (WDM) PON. This upgrade is evident with the continuous growth of Internet users, that makes traditional EPONs not capable of coping with this increase. Here, we present novel dynamic wavelength and bandwidth allocation schemes (DWBAs) to arbitrate the transmission of ONUs over multiple wavelengths. We then present three new DWBAs to support quality of service (QoS) in the new WDM-PON. We validate all the proposed models and schemes by conducting comprehensive experiments and extensive simulations, where performance is evaluated. Finally, we conclude our work and presents suggested future wor

Design and Analysis of Green Mission-Critical Fiber-Wireless Broadband Access Networks

In recent years, the ever-increasing environmental friendliness concern has made energy efficiency in telecom networks as an important theme in their operations. Meanwhile, mission-critical (MC) services and systems (such as healthcare, police, and firefighting) have been acquiring special attention from telecom designers and operators. The currently deployed MC network technologies are indigent in terms of bandwidth capacity, and thus they are not able to support the emerging MC multimedia applications. Therefore in this thesis, we first explore the possibility of provisioning the MC services over the integration of fiber-wireless (FiWi) technologies, which has been considered as a promising candidate for the deployment of high-speed and mobile broadband access networks. We then investigate the energy efficiency problem in the FiWi integration, which consists of WiMAX in the wireless plane, and of Ethernet Passive Optical Network (EPON) - the most popular variant of the next-generation PON (NG-PON) technology, in the optical plane. In WiMAX, the energy saving protocol has been extensively investigated and standardized. Conversely, it has been recently studied in NG-PON, which currently consumes the least power among all the high-speed access networks. However, NG-PON has notably matured in the past few years and is envisioned to massively evolve in the near future. This trend will increase the power requirements of NG-PON and make it no longer coveted. Therefore we address the energy efficiency problem in NG-PON. For each of our contributions, we conduct extensive simulations to demonstrate the effectiveness and advantages of the proposed solutions