The purpose of call admission control in lntegrated Services Networks is to offer a guarantee that Qua.lity of Service (QoS) bounds are not violated due to the admission of new ca.lls into the network. This is typically accomplished using the declared worst-case traffic descriptors for incoming calls, a solution which results in poor bandwidth utilization. A measurement-based admission scheme is an appealing alternative: not only does it offer adaptivity to changing traffic conditions, it also

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... llows statistica.l multiplexing gains tobe exploited. In this paper, we examine the problern of determining which traffic characterization a measurement-based admission control algorithm should require of sources requesting access. Building on the work of Jamin et al. (1995) , we also propose an adaptive measurement-based admission control algorithm that simplifies the estimation process, and show that it can achieve a high level of utilization without violating its delay-based QoS guarantees.