DYNAMIC RATE-BASED VIRTUAL CLOCK SCHEDULER FOROUTPUT BUFFERED IP SWITCHES

摘要

In this paper, an enhanced and improvedversion of the rate-based Virtual Clock scheduling algorithmis proposed and analyzed. The Virtual Clock scheduling tagconstituting of the firewall and inverse bandwidth tagimplements static bandwidth paradigm. However, themigration towards robust and adaptive network applicationshave complemented with dynamic resource reservationschemes are becoming dominant as the communicationcommunity increases. Thus, an enhancement of the VirtualClock algorithm to sustain dynamic conditions is proposedin this research. An acceleration concept in contexts ofcongestion prevention is implemented in the proposedscheduler. The proposed enhanced Virtual Clock schemeaims at fulfilling the requested level of Quality of Service(QoS) while simultaneously achieving high resourceutilization via a versatile and dynamic resource reservationscheme. An enhanced scheduling tag is implemented in theresearch. The tag computation integrates an correlationindex between utilization and the sustained average delay.The results obtained through the extensive discrete-eventsimulation models have shown that the enhanced schemehas significantly improved the average delay, average bufferutilization and for different traffic patterns. The proposedscheme can be adopted for adaptive real-time traffic basedapplications to enhance the QoS in terms of better delay andimproved resource utilization.