PERFORMANCE EVALUATION OF A PRIORITIZED RESERVATIONSCHEME FOR OPTICAL BURST SWITCHING (OBS)

摘要

This paper proposes a new reservation scheme forprioritized wavelength occupation in the OBS network.The scheme employs an extra offset time (EOT) to itsreal-time (RT) traffic during periods of congestion, only.In other words, when all wavelengths are occupied, theRT traffic is given priority over the non real-time (NRT)traffic, by offsetting its service time with the employmentof EOT. This obviates the idea of providing fixed extraoffset time (FEOT) to RT traffic at all times, as in thecase of prioritized just enough time (pJET). Since theproposed scheme needs to check the availability ofwavelengths in advance before employing the EOT, thisidea is incorporated into the Horizon reservation scheme,which has the benefit of ‘time horizon’, hence, the nameprioritized Horizon (pHorizon). The pHorizon iscompared against the pJET to evaluate the performance ofthe former scheme in terms of blocking probabilities, andin providing sufficient Quality of Service (QoS).