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

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