A model of QoS differentiation burst assembly with padding for improving the performance of OBS networks

Authors: VIET MINH NHAT VO, VAN HOA LE, HOANG SON NGUYEN, MANH THANH LE

Abstract: Burst assembly is an operation at the ingress node of optical burst switching (OBS) networks that aggregates incoming packets from various access networks into larger carriers, called bursts. Depending on the density of incoming packets and the preset time or length thresholds, the completed bursts may have various lengths, but they must be at least equal to a minimum value ($B_{\min})$ to facilitate the switching in existing physical optical switches. If a completed burst is smaller than $B_{\min}$, it should be padded by padded bytes and it results in bandwidth utilization inefficiency. One solution to the problem is increasing the assembly time so that completed bursts must be longer than or at least equal to $B_{\min}$. However, increasing the assembly time will result in increased end-to-end delay. This article proposes a model of QoS differentiation burst assembly with padding for improving the performance of OBS networks.

Keywords: Optical burst switching networks, burst assembly, QoS differentiation, burst padding, bandwidth utilization efficiency, delay reduction, throughput fairness

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