• About
  • Policies
  • What is openaccess
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Electrical and Electronics Engineering
      • Dept. of Electrical and Electronics Engineering - Ph.D. / Sc.D.
      • View Item
      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Electrical and Electronics Engineering
      • Dept. of Electrical and Electronics Engineering - Ph.D. / Sc.D.
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Effect of burst assembly over TCP performance in optical burst switching networks

      Thumbnail
      View / Download
      1.4 Mb
      Author
      Gürel, Güray
      Advisor
      Karaşan, Ezhan
      Date
      2006
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
      Item Usage Stats
      70
      views
      27
      downloads
      Abstract
      Optical Burst Switching (OBS) is proposed as a short-term feasible solution that is capable of efficiently utilizing the optical bandwidth of the future Internet backbone. Performance evaluation of TCP traffic in OBS networks has been under intensive study, as TCP constitutes the majority of Internet traffic. Since burst assembly mechanism is one of the fundamental factors that determine the performance of an OBS network, we focus our attention on burst assembly and specifically, we investigate the influence of the number of burstifiers on TCP performance for an OBS network. We start with a simple OBS network scenario where very large flows are considered and losses resulting from the congestion in the core OBS network are modeled using a burst independent Bernoulli loss model. Then, a background burst traffic is generated in order to create contention at a core node realizing burst-length dependent losses. Finally, simulations are repeated for Internet flows where flow sizes are modeled using a Bounded Pareto distribution. Simulation results show that for an OBS network employing timerbased assembly algorithm, TCP goodput increases as the number of burst assemblers is increased for each loss model. The improvement from one burstifier to moderate number of burst assemblers is significant, but the goodput difference between moderate number of buffers and per-flow aggregation is relatively small, implying that a cost-effective OBS edge switch implementation should use moderate number of assembly buffers per destination. The numerical studies are carried out using nOBS, which is an ns2 based OBS simulation tool, built within this thesis for studying the effects of burst assembly, scheduling and contention resolution algorithms in OBS networks.
      Keywords
      Optical Burst Switching
      Burst Assembly
      TCP Performance
      Permalink
      http://hdl.handle.net/11693/29810
      Collections
      • Dept. of Electrical and Electronics Engineering - Ph.D. / Sc.D. 145
      Show full item record

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartments

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 1771
      Copyright © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy