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>Design and implementation of next generation Ethernet-based hybrid wired/wireless broadband access networks for delivering differentiated services.
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Design and implementation of next generation Ethernet-based hybrid wired/wireless broadband access networks for delivering differentiated services.
This thesis addresses the important problem of how to provide the broadband services available at the backbone to the end users with cost effective solution that is robust and reliable. The work is focused on developing, modeling and analysis of various architectures and algorithms to provide broadband services to wired as well as wireless users. We proposed hybrid wired/wireless architectures based on PON to provide broadband differentiated services to end users.;The main body of the work is divided in to two main overlapping phases.;The first phase addresses a novel hybrid FSO/RF architecture based on PON. The proposed architecture provides cost effective solution for broadband services to end users that no other technology can compete. The first phase is divided in to 3 sections.;In the first section, we assess the feasibility, cost and the performance of the proposed architecture with that of a typical EPON architecture using the IPACT and limited DBA scheme. In simulation an event-driven packet-based simulation model was developed using C++. Two simulation programs with identical network parameters were developed, one for typical EPON using IPACT architecture and the other for the proposed architecture.;In the second section Fair Queuing Algorithms are provided to deliver differentiated services to the end users. To achieve fair queuing across different independent network flows in upstream direction, a fairness algorithm need to be implemented. A number of algorithms have been proposed to achieve fair queuing across different independent network flows in the literature, e.g., Deficit Round Robin (DRR), Weighted Fair Queuing (WFQ), and Fair Queuing with Round Robin. Considering the fact that DRR is an important fair queuing algorithm that is used in CISCO's Gigabit Switch Router 12016, we are going to implement DRR for fair queuing algorithm at the OLT (Optical Line Terminal). QoS is implemented in down stream direction by OLT and in upstream direction by DU.;In the third section we proposes a novel fair queuing algorithm for hybrid wired and wireless access network with wireless compensation to provide QoS bounds to Ethernet traffic for wired as well as wireless users with wireless error compensation. Scheduler maps priorities and weights for QoS of the Ethernet into wireless MAC.;In the second phases of the work we modified the architecture to deliver broadband differentiated services to mobile end users. The proposed Passive Optical Network (PON) based UMTS broadband wireless access network architecture provide multimedia services (video telephony, video streaming, mobile tv, mobile emails etc) to mobile users. In the conventional wireless access networks, the base stations (Node B) and Radio Network Controllers (RNC) are connected by point to point T1/E1 lines (Iub interface), the T1/E1 lines are not capable of supporting bandwidth (BW) required by next generation wireless multimedia services proposed by High Speed Packet Access (HSPA, Rel.5) for Universal Mobile Telecommunications System (UMTS) and Evolution Data only (EV-DO) for Code Division Multiple Access 2000 (CDMA2000). The proposed PON based back haul can provide Giga bit data rates and lub is shared by Node Bs. We also propose a novel algorithm to provide end to end QoS (between RNC and user equipment). The algorithm provides QoS bounds in the wired domain as well as in wireless domain with compensation for wireless link errors.
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