Adaptive threshold-based decision for efficient hybrid deflection and retransmission scheme in OBS networks

  • Authors:

  • Martin Lévesque;Halima Elbiaze;Wael Hosny Fouad Aly

  • Affiliations:

  • Department of Computer Science, Université du Québec à Montréal, Montréal, QC, Canada;Department of Computer Science, Université du Québec à Montréal, Montréal, QC, Canada;Department of Computer Science, Université du Québec à Montréal, Montréal, QC, Canada

  • Venue:
  • ONDM'09 Proceedings of the 13th international conference on Optical Network Design and Modeling
  • Year:
  • 2009

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Abstract

Burst contention is a well-known challenging problem in Optical Burst Switching (OBS) networks. Deflection routing is used to resolve contention. Burst retransmission is used to reduce the Burst Loss Ratio (BLR) by retransmitting dropped bursts. Previous works show that combining deflection and retransmission outperforms both pure deflection and pure retransmission approaches. This paper proposes a new Adaptive Hybrid Deflection and Retransmission (AHDR) approach that dynamically combines deflection and retransmission approaches based on network conditions such as BLR and link utilization. Network Simulator 2 (ns-2) is used to simulate the proposed approach on different network topologies. Simulation results show that the proposed approach outperforms static approaches in terms of BLR by using an adaptive decision threshold.