Showing papers by "Norvald Stol published in 2004"
TL;DR: The Preemptive Drop Policy is extended into the Adaptive PDP (APDP), which provides absolute QoS guarantees in OPS, and an analytical model of the PDP is introduced for switches with and without wavelength conversion.
Abstract: Optical Packet Switching (OPS) is a promising technology for future core networks due to the ability to handle bursty traffic, adaptability to changes in the network infrastructure and good network utilization. In order to provide sufficient Quality of Service (QoS) to the emerging range of real-time and critical business applications, service differentiation should be present in future OPS. This paper presents the Preemptive Drop Policy (PDP), which provides service differentiation in asynchronous bufferless OPS. Based on time-continuous Markov chains, we introduce an analytical model of the PDP for switches with and without wavelength conversion. We extend the PDP into the Adaptive PDP (APDP), which provides absolute QoS guarantees in OPS. Simulations performed validate our analytical model and show that the APDP operates properly in a dynamic changing system load scenario.
22 citations
TL;DR: Results indicate that the performance is degraded as the burstiness of the arrival process increases, and the packet loss rates in the case of a bursty hyper-exponential arrival process are derived.
Abstract: Service differentiation is a crucial issue in the next -generation Optical Packet Switched networks In this paper we examine how bursty traffic influences the performance of a service differentiated Optical Packet Switched network By using time -continuous Markov chains, we derive explicit results for the packet loss rates in the case of a bursty hyper-exponential arrival process Results indicate that the performance is degraded as the burstiness of the arrival process increases
19 citations
Journal Article•
TL;DR: An analytical model is presented, which considers the effects of the switching time on the network performance in service differentiated optical packet/burst switching (OPS/OBS) networks, and shows that the benefits of statistical resource sharing are almost non-existent for low priority traffic when the switchingTime is large.
Abstract: In this paper we present an analytical model, which considers the effects of the switching time on the network performance in service differentiated optical packet/burst switching (OPS/OBS) networks. Our results indicate that the switching time must be less than 10% of the packet/burst duration in order to avoid any significant reductions in the network performance. Furthermore, regarding a network with full wavelength conversion, we show that the benefits of statistical resource sharing are almost non-existent for low priority traffic when the switching time is large.
4 citations