QoS Performance of WR-OBS Network Architecture with Request Scheduling

The paper investigates the QoS performance with service differentiation of the wavelength-routed optical burst switched (WR-OBS) network architecture. The request scheduler was analysed as the means of the QoS provisioning and impact of the request scheduling on the QoS performance was investigated in terms of the burst blocking probability and burst end-to-end delays. The WR-OBS QoS performance was also studied as a function of the wavelength requirement. The trade-off between the wavelength over-provisioning and the maximum scheduling delay satisfying the service requirements is reported for both premium and best-effort traffic classes. It is shown that the request scheduling allows to significantly improve the QoS performance and reduce the wavelength requirement in the WR-OBS.

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