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

Abstract

Burst assembly is an operation at the ingress node of optical burst switching (OBS) networks that aggregatesincoming packets from various access networks into larger carriers, called bursts. Depending on the density of incomingpackets and the preset time or length thresholds, the completed bursts may have various lengths, but they must be atleast equal to a minimum value (Bmin) to facilitate the switching in existing physical optical switches. If a completedburst is smaller than Bmin , 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 leastequal to Bmin . However, increasing the assembly time will result in increased end-to-end delay. This article proposes amodel of QoS differentiation burst assembly with padding for improving the performance of OBS networks.