Traffic Control Based on Contention Resolution in Optical Burst
AbstractTraffic control based on contention resolution process (TCCR) is proposed in this study as a quality of service (QoS) mechanism to offer service level agreement (SLA) for optical burst switch (OBS). QoS of the high and the low priority classes are issued upon their SLA. The first one is defined for real time application as Internet protocol television (IP TV) and voice over Internet protocol (VoIP) while the other is for soft real–time service as Internet protocol remote terminal unit (IP RTU) based on IEC 86070–5–101/104 protocol. A combination of burst aggregation (BA), extra offset time, and fiber delay line (FDL) are utilized in TCCR to offer absolute service differentiation QoS to the high priority class. The experiments show TCCR can offer the high priority class of its satisfied SLA for both blocking probability and delay. It also relatively improves the performances of the low priority class bounded in its SLA because TCCR does not force to drop this class. The performances of TCCR are compared with the other techniques such as no class isolation and bandwidth allocation processes. The comparisons show TCCR gives the best solution of the defined SLA which enhances OBS performances and properly differentiates class of services.
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