Novel Composite Burst Assembly for OBS-Networks

Abstract

Multiple priority packets are aggregated together to form a composite data-burst in an optical burst-switched network. The tail of the composite data-burst contains low-priority packets. It assumes that contention between data-bursts can be resolved by clipping and dropping the tail of data-burst which contains low-priority packets that result in quality-of-service (QoS) differentiation. This mechanism requires implementation of complex preemption-based scheduling scheme which employs increased signaling on the control channel. Further, it fails to handle several contention and scheduling scenarios especially when a data-burst contends at head- and tail-ends, simultaneously. Furthermore, in order to provide maximal class isolation, it has been identified that the best approach is to safeguard the high-priority packets by dropping low-priority packets. Thus, we propose a novel scheme for assembling a composite data-burst in which the packets having high-priority are placed at the tail-end. It has been learnt from the results of simulation that our proposed scheme guarantees maximum class isolation between traffic classes having low and high priority. Furthermore, class isolation is investigated for several percentage of class-0, highest priority, packets in a composite data-burst.