In a high-speed packet switched communication system such as an ATM network, the number of existing connections is limited by a Connection Admission Control (CAC) procedure. For each newly requested connection, the expected traffic rate is added to an already reserved bandwidth and a test is made whether the sum is above a given limit.;According to the invention, the reserved bandwidth (r_bw) is updated not only for each new connection adding the additional requested capacity (RQ), but also in-between using an effective traffic capacity value derived from measuring the actual traffic (EC). For obtaining a reasonable effective traffic capacity value, the traffic sample sequence is modified by filtering out the “noise” representing short-time variations. This is done in an iterative procedure in which the cutoff between the signal and the “noise” portion is adaptively and dynamically changed so that the available buffer capacity can accommodate just that noise portion. For the filtering process, wavelet transformation is used.
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