Burst transmission algorithm to improve packet level performance in contention-free slotted OBS networks

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• 作者：Hozumi Kawanami (1)
  Hiroyuki Masuyama (1)
  Takuji Tachibana (2)
  Shoji Kasahara (1)
  Yutaka Takahashi (1)
  
• 关键词：Slotted optical burst switching ; Burst transmission algorithm ; Contention ; free networks ; Queueing analysis ; Packet level performance
• 刊名：Photonic Network Communications
• 出版年：2010
• 出版时间：August 2010
• 年：2010
• 卷：20
• 期：1
• 页码：54-63
• 全文大小：993KB
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• 作者单位：Hozumi Kawanami (1)
  Hiroyuki Masuyama (1)
  Takuji Tachibana (2)
  Shoji Kasahara (1)
  Yutaka Takahashi (1)
  
  1. Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto, 606-8501, Japan
  2. Nara Institute of Science and Techonology, 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
  
• ISSN：1572-8188

文摘

In contention-free slotted optical burst switching (SOBS) networks, controllers are utilized in order to manage the time-slot assignment, avoiding congestions among multiple burst transmissions. In this network, bursts are never lost at intermediate nodes but packets are lost at an ingress edge node due to a burst transmission algorithm. In addition, packet transmission delay increases depending on the algorithm. In order to improve packet level performance, in this paper, we propose a new burst transmission algorithm. In this method, two different thresholds are used; one is used to send a control packet to a controller and the other is used to assemble a burst. With these thresholds, a time slot can be assigned to a burst in advance and packet level performance can be improved. In order to evaluate its packet level performance and investigate the impact of thresholds, we also propose a queueing model of a finite buffer where a batch of packets are served in a slot of a constant length. Numerical results show that our proposed method can decrease packet loss probability and transmission delay with two thresholds. In addition, we show that our analysis results are effective to investigate the performance of the proposed method when the number of wavelengths is large.