Prioritized burst segmentation and composite burst-assembly techniques for QoS support in optical burst-switched networks

In this paper, we address the issue of providing differentiated services to IP packets over an optical burst-switched network. QoS is supported by introducing prioritized contention resolution policies in the network core and a new burst assembly technique at the network edge. In the core, contention is resolved through prioritized burst segmentation and prioritized deflection. The burst segmentation scheme allows high-priority bursts to preempt low-priority bursts and enables full class isolation between bursts of different priorities. At the edge of the network, we introduce a composite burst assembly technique which combines packets of different classes into the same burst. By implementing burst segmentation in the core, those packets which are placed at the tail of the burst are more likely to be dropped than packets which are placed at the head of the burst. The proposed schemes are evaluated through analysis and simulation, and it is shown that significant differentiation between traffic classes may be achieved.