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—A number of schemes have been proposed for providing quality-of-service (QoS) differentiation in optical burst-switched (OBS) networks. Most existing schemes are based on a relative QoS model in which the service requirements for a given class of traffic are defined relative to the service requirements of another class of traffic. In this paper, we propose(More)
– In this paper we address the issue of contention resolution in optical burst switched networks, and we introduce an approach for reducing packet losses which is based on the concept of burst segmentation. In burst segmentation, rather than dropping the entire burst during contention, the burst may be broken into multiple segments, and only the overlapping(More)
— In this paper, we propose a novel proactive scheme, burst cloning, to reduce data loss due to burst contention in optical burst-switched (OBS) networks. The idea is to replicate a burst and send duplicated copies of the burst through the network simultaneously. If the original burst is lost, the cloned burst may still be able to reach the destination.(More)
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(More)
— In optical burst-switched networks, data loss may occur when bursts contend for network resources. There have been several proposed solutions to resolve contentions in order to minimize loss. These localized contention resolution techniques react to contention, but do not address the more fundamental problem of congestion. Hence, there is a need for(More)
In this work, we consider the problem of maximizing the reliability of connections in mesh networks against failure scenarios in which multiple links may fail simultaneously. We consider the single-path connection problem as well as multiple-path (protected) connection problems. The problems are formulated as minimum-color path problems, where each link is(More)
In a single-hop WDM optical network, a straightforward approach to implementing multicasting is to schedule a single transmission to multiple destinations so that all of the desti-nations' receivers must tune to the same channel at the same time. Although scheduling a single transmission in this manner reduces the amount of transmitter and channel resources(More)
— In this paper, we address the online multicast traffic grooming problem in wavelength-routed WDM mesh networks with sparse grooming capability. We develop a multicast dynamic light-tree grooming algorithm (MDTGA) that can support multi-hop traffic grooming by taking advantage of light-trees. In this algorithm, a light-tree can be dropped, branched, and(More)
— In this paper, we evaluate the performance of a burst retransmission scheme in which the bursts lost due to contentions in an OBS network are retransmitted at the OBS layer. The retransmission scheme aims to reduce burst loss probability in OBS networks. We develop an analytical model for obtaining the burst loss probability over an OBS network that uses(More)