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|العنوان:||Bandwidth Quantization for Elastic Optical Networks||المؤلفون:||Shahad Waleed AlEnezi||Supervisor:||Prof. Anwar AlYatama||الموضوع:||Bandwidth : Networks||تاريخ الاصدار:||2018||الناشر:||Kuwait university - college of graduate studies||ملخص:||Elastic optical networks (EONs) are considered to be the effective solution for future high-speed networks. This is because EONs can handle the rapid growth in traffic demands (i.e. transmitting rates) through their ability to manage network resources efficiently and utilize the available spectrum in a better way to adapt with the new changes. Routing and spectrum assignment (RSA) problem in EONs is one of the key challenges that gains a great attention from researchers recently because of their direct impact on the design, operations, and efficiency of EONs. Current networks support continuous-rate transmission channels, where each request is being served by reserving the exact size of requested spectrum (frequency slots) from the link bandwidth. Ultimately, this support will lead to difficulties in controlling congestion, billing, routing, and admission. This problem can get exacerbated with the complexity growth in network design. Therefore, a new network design with minor difference in performance and reduced design complexity compared with the existing networks, which support continuous rates, is needed. In this thesis, it is proposed to support all transmission rates by having a number of frequency levels, where each one of them serves a certain number of transmission rates, such that if a requested transmission rate is not supported, the next higher bandwidth will be used to serve the request. This type of a network is called a network with a quantized bandwidth. The effect of bandwidth quantization on online RSA for EONs is also studied in this thesis, in which the frequency slots assignment for each request must maintain the continuity and contiguity. In this thesis, both uniform and non-uniform traffic distributions are studied. The covered non-uniform distributions are exponential, negative exponential, bell shape (normal), and multimodal. Two algorithms are used to set up the starting and ending points of the quantization levels for the non-uniform distributions which are Kaufman and Simulated annealing algorithms. Those algorithms are used because the quantization levels are not equally sized in the non-uniform distributions, whereas for uniform distribution, the quantization levels are equally spaced and there is no need to use those algorithms. The numerical results showed a small difference in performance between the proposed solution and the existing un-quantized bandwidth EONs and showed that only the offered load distribution (shape) has a strong correlation with the number of quantization levels and their locations||URI:||http://hdl.handle.net/123456789/719|
|يظهر في المحتويات:||0612 Computer Engineering|
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