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Optical Engineering

Supporting differentiated quality of service in optical burst switched networks
Author(s): Bin Zhou; Mostafa A. Bassiouni
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Paper Abstract

We propose and evaluate two new schemes for providing differentiated services in optical burst switched (OBS) networks. The two new schemes are suitable for implementation in OBS networks using just-in-time (JIT) or just-enough-time (JET) scheduling protocols. The first scheme adjusts the size of the search space for a free wavelength based on the priority level of the burst. A simple equation is used to divide the search spectrum into two parts: a base part and an adjustable part. The size of the adjustable part increases as the priority of the burst becomes higher. The scheme is very easy to implement and does not demand any major software or hardware resources in optical cross-connects. The second scheme reduces the dropping probability of bursts with higher priorities through the use of different proactive discarding rates in the network access station (NAS) of the source node. Our extensive simulation tests using JIT show that both schemes are capable of providing tangible quality of service (QoS) differentiation without negatively impacting the throughput of OBS networks.

Paper Details

Date Published: 1 January 2006
PDF: 12 pages
Opt. Eng. 45(1) 015003 doi: 10.1117/1.2151852
Published in: Optical Engineering Volume 45, Issue 1
Show Author Affiliations
Bin Zhou, Univ. of Central Florida (United States)
Mostafa A. Bassiouni, Univ. of Central Florida (United States)


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