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Browsing by Subject "service differentation"

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    Item type:Doctoral Dissertation, Access status: Open Access ,
    Net neutral quality of service differentiation in flow-aware networks
    (2008-09-25) (Data obrony: 2011) Wójcik, Robert
    Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
    Flow-Aware Networking (FAN) architecture is evaluated in this dissertation with regard to its service differentiation and quality of service (QoS) assurance capabilities. The network neutrality debate is presented first, and it is shown that the potential resolutions will have a strong impact on QoS architectures. Secondly, the detailed concept of FAN is presented and compared with other flow-based QoS architectures designed for IP networks. It is argued that all the solutions have their advantages and disadvantages, however, in FAN, the pros outnumber the cons in comparison with other architectures. The main goal of the dissertation is to propose and evaluate new mechanisms to enhance service differentiation capabilities of FAN architecture. The waiting times phenomenon as a result of admission control functionality is documented. Next, differentiated blocking and differentiated queuing mechanisms are proposed. Finally, Class of Service on Demand is shown as the ultimate method of providing rich service differentiation without violating the network neutrality principle. The static limitation and automatic intelligent limitation mechanisms are proposed as a simple, yet efficient way of improving service assurance. It is shown that limitation mechanisms significantly contributes to FAN's scalability and yields great performance benefits. Finally, the predictive approach is presented, which changes the functioning of the admission control block in FAN. Instead of waiting for congestion to appear and only then blocking new connections, the mechanism takes a pro-active approach and starts to act on the basis of the predicted values of the congestion indicators.