This work proposes a method for service differentiation in optical burst switching (OBS) nodes adopting theJust Enough Time, JET, reservation mechanism. It consists of optimizing the number of wavelength convertersemployed in the node and proper setting of the extra-offset time intervals to satisfy different levels of qualityof service (QoS). The ON/OFF model with exponentially distributed OFF periods, both exponentially andheavy-tailed distributed ON periods is adopted to assess the node performance under different traffic patterns.The OBS node investigated in this paper is equipped with M £M optical interfaces with N wavelengths eachat 2:5 Gbits/s. We suppose that wavelength converters are available and that the system is bufferless, i.e., nofiber delay lines are available. One way to reduce the blocking of higher priority users is to grant them a longerextra-offset time. Another way to provide higher priority users with better performance is to allow them onlyto employ wavelength converters. Low priority incoming bursts can be retransmitted on the output link on thesame wavelength only.
Service Differentiation in Optical Burst Switching: Performance Evaluation under LRD Traffic / Casoni, Maurizio; Merani, Maria Luisa. - STAMPA. - (2003), pp. 1-1. (Intervento presentato al convegno Workshop on Optical Burst Switching (WOBS) tenutosi a Dallas (TX, USA) nel 16 Ottobre 2003).
Service Differentiation in Optical Burst Switching: Performance Evaluation under LRD Traffic
CASONI, Maurizio;MERANI, Maria Luisa
2003
Abstract
This work proposes a method for service differentiation in optical burst switching (OBS) nodes adopting theJust Enough Time, JET, reservation mechanism. It consists of optimizing the number of wavelength convertersemployed in the node and proper setting of the extra-offset time intervals to satisfy different levels of qualityof service (QoS). The ON/OFF model with exponentially distributed OFF periods, both exponentially andheavy-tailed distributed ON periods is adopted to assess the node performance under different traffic patterns.The OBS node investigated in this paper is equipped with M £M optical interfaces with N wavelengths eachat 2:5 Gbits/s. We suppose that wavelength converters are available and that the system is bufferless, i.e., nofiber delay lines are available. One way to reduce the blocking of higher priority users is to grant them a longerextra-offset time. Another way to provide higher priority users with better performance is to allow them onlyto employ wavelength converters. Low priority incoming bursts can be retransmitted on the output link on thesame wavelength only.Pubblicazioni consigliate
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