Performance of Deferred Reservations in Data Networks
نویسندگان
چکیده
This paper studies the performance of deferred resource reservation in data networks. Conventional resource reservation protocols, such as PNNI and RSVP adopt an all-or-nothing approach, where partially acquired resources must be released if resources are not available at all links on the chosen path. During periods of high network load, this leads users to retry requests repeatedly, adding control tra c at exactly the time when the network's capacity to process that control tra c is exhausted. Deferred REServation (DRES) can signi cantly improve performance by reducing the overall call rejection probability, allowing more tra c to be carried, using the same resources. Call admissibility is increased by deferring requests at routers for a limited period of time until resources become available. The paper includes an analysis of the performance of a DRES multiplexor, for Poisson and bursty reservation arrival processes, and simulation results for substantial network con gurations, using several di erent QoS routing methods.
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