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Technical Report


Resource Allocation and Admission Control Styles in QoS DiffServ Networks


In this paper we propose a DiServ architecture for the support of real time trac eg video with QoS constraints eg bandwidth and delay over an IP domain The main goal of the paper is to identify solutions which provide QoS guarantees without requiring per ow processing in the core routers as is commonly done in IntServ solutions and which are thus scalable In the paper we de ne and compare dierent options for supporting per hop forwarding behaviors PHB First we de ne packet classi cation functions and trac conditioning functions with particular emphasis on shaping at border routers Then we propose dierent approaches for call admission control CAC and resource allocation These approaches are all consistent with the DiServ model but place dierent processing and signaling loads on edge and core routers One approach is based on measurements at core routers and CAC at edge routers Another approach is based on CAC at all routers along the selected path it requires bookkeeping of resource allocation for behavior aggregates but not for speci c ows and is supported by an explicit signaling protocol Yet a third approach is the compromise of the rst two and seems to combine their bene ts In a second set of experiments we combine these dierent CAC styles treated as separate classes in the same network We show that WFQ scheduling allows the coexistence of these two classes with minimum impact on relative performance In all cases paths are computed by means of a QoS routing algorithm Q OSPF MPLS is used to handle explicit routing and class separation The alternative techniques are evaluated with respect to performance and implementation cost using simulation in a video application scenario

Paper: PDF file of paper

Information & Date

UCLA CSD Technical Report #010008, , May. 2001


M. Gerla
C. Casetti
S.S. Lee
G. Reali