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      • Department of Electrical and Electronics Engineering
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      Effect of number of burst assemblers on TCP performance in optical burst switching networks

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      Author
      Gürel, Güray
      Karasan, Ezhan
      Date
      2006-10
      Source Title
      3rd International Conference on Broadband Communications, Networks and Systems, BROADNETS 2006
      Publisher
      IEEE
      Pages
      [1] - [7]
      Language
      English
      Type
      Conference Paper
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      Abstract
      Burst assembly mechanism is one of the fundamental factors that determine the performance of an optical burst switching (OBS) network. In this paper, we investigate the influence of number of burstifiers on TCP performance for an OBS network. An ns2-based OBS network simulator is developed for simulating the optical network. The goodput of TCP flows between an ingress and an egress nodes traveling through an optical network is studied for different values of the number of assembly buffers per destination. First, the 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 to create contention at a core node in order to realize a burst dependent loss model. Simulation results show that for an OBS network employing timer-based assembly algorithm, TCP goodput increases as the number of burst assemblers is increased for both types of loss models. The improvement from one burstifier to moderate number of burst assemblers is significant (15-50% depending on the burst loss probability, processing delay and the TCP version), but the goodput difference between moderate number of buffers andperflow aggregation is relatively small, implying that a cost-effective OBS edge switch implementation should use moderate number of assembly buffers per destination for enhanced TCP performance. © 2006 IEEE.
      Keywords
      Agglomeration
      Cost effectiveness
      Optical data processing
      Optical materials
      Optical switches
      Packet networks
      Packet switching
      Telecommunication systems
      Transmission control protocol
      OBS networks
      TCP performances
      Switching networks
      Permalink
      http://hdl.handle.net/11693/27214
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/BROADNETS.2006.4374326
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      • Department of Electrical and Electronics Engineering 3524
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