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oai:recercat.cat:2117/223102026-02-04T01:59:35Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Triay Marquès, Joan author Cervelló Pastor, Cristina author Vokkarane, Vinod M. author 2013 Immediate reservation (IR) and advance reservation (AR) are the two main reservation mechanisms currently implemented on large-scale scientific optical networks. They can be used to satisfy both provisioning delay and low blocking for delay-tolerant applications. Therefore, it seems reasonable that future optical network provisioning systems will provide both mechanisms in hybrid IR/AR scenarios. Nonetheless, such scenarios can increase the blocking of IR if no quality-of-service (QoS) policies are implemented. A solution could be to quantify such blocking performance based on the current network load and implement mechanisms that would act accordingly. However, current blocking analytical models are not able to deal with both IR and AR. In this paper, we propose an analytical model to compute the network-wide blocking performance of different IR/AR classes within the scope of a multiservice framework for optical wavelength-division multiplexing (WDM) networks. Specifically, we calculate the blocking on two common optical network scenarios using the fixed-point approximation analysis: on wavelength conversion capable and wavelength-continuity constrained networks. Performance results show that our model provides good accuracy compared to simulation results, even in a scenario with multiple reservation classes defined by different book-ahead times. Postprint (published version) Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica Optical communications Advance reservation analytical model immediate reservation optical networks wavelength-division multiplexing (WDM) Multiplexatge Comunicacions òptiques Analytical blocking probability model for hybrid immediate and advance reservations in optical WDM networks