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      • Department of Electrical and Electronics Engineering
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      Congestion window-based adaptive burst assembly for TCP traffic in OBS networks

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      Author
      Ozsarac, S.
      Karasan, E.
      Date
      2010-06-29
      Source Title
      Photonic Network Communications
      Print ISSN
      1387-974X
      Publisher
      Springer
      Volume
      20
      Issue
      2
      Pages
      138 - 150
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      Burst assembly is one of the key factors affecting the TCP performance in optical burst switching (OBS) networks. When the TCP congestion window is small, the fixed-delay burst assembler waits unnecessarily long, which increases the end-to-end delay and thus decreases the TCP goodput. On the other hand, when the TCP congestion window becomes larger, the fixed-delay burst assembler may unnecessarily generate a large number of small-sized bursts, which increases the overhead and decreases the correlation gain, resulting in a reduction in the TCP goodput. In this paper, we propose adaptive burst assembly algorithms that use the congestion window sizes of TCP flows. Using simulations, we show that the usage of the congestion window size in the burst assembly algorithm significantly improves the TCP goodput (by up to 38.4% on the average and by up to 173.89% for individual flows) compared with the timerbased assembly, even when the timer-based assembler uses the optimum assembly period. It is shown through simulations that even when estimated values of the congestion window size, that are obtained via passive measurements, are used, TCP goodput improvements are still close to the results obtained by using exact values of the congestion window.
      Keywords
      Adaptive burst assembly
      TCP over OBS
      Burst assembly
      Congestion window
      End to end delay
      Fixed-delay
      Key factors
      OBS networks
      Passive measurements
      TCP congestion
      TCP flows
      Optical switches
      Optical burst switching
      Permalink
      http://hdl.handle.net/11693/22195
      Published Version (Please cite this version)
      http://dx.doi.org/10.1007/s11107-010-0254-2
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      • Department of Electrical and Electronics Engineering 3636
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