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Absolute priority just-enough-time scheme for absolute quality of service in optical-burst-switching networks

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Abstract

We propose an extension of the popular priority just-enough-time (PJET) system in optical-burst-switched networks to provide absolute quality-of-service (QoS) differentiation. PJET is a simple QoS protocol that provides relative service differentiation by means of an extra offset time given to higher-priority bursts. By the innovative use of fiber delay lines (FDLs) and an accompanying token algorithm, we are able to achieve an absolute QoS technique that provides a worst-case loss probability for the guaranteed traffic. This absolute PJET technique is similar to the PJET scheme in that it conforms to the conservation law at high loads. This means that the drop probability of low-priority bursts is kept to a minimum. This is a significant advantage over existing absolute QoS techniques that employ intentional dropping or wavelength reservation, which does not conform to the conservation law.

© 2004 Optical Society of America

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