In this paper we introduce the notion of link and network admission control (LAC, NAC) and present three fundamentally different budget based NAC methods which categorize most of today's implemented NAC approaches. We propose a performance evaluation framework for their comparison. The required network capacity for each method is dimensioned for a certain flow blocking probability and the average resource utilization is taken as performance measure. We point out several implementation options and investigate their impact. Based on numerical results we give recommendations for preferred procedures. Finally, we compare different NAC methods under varying load conditions.

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