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Abstract

In high speed cell switching networks, a Call Admission Control (CAC) procedure is performed on each connection according to a specified Traffic Descriptor. A mandatory parameter of the Traffic Descriptor is the Peak Cell Rate (PCR), associated with a Cell Delay Variation Tolerance (CDVT). Connections which specify a high CDVT value may potentially send into the network bursts of cells at a rate much higher than the declared Peak Cell Rate, which may lead to congestion in cell buffers of intermediate network nodes. Guaranteeing the Quality of Service (QoS) for such connections may require the reservation of a high amount of resources in the network, leading to poor utilization of those resources. A Call Admission Control procedure, associated with an Usage Parameter Control/Network Parameter Control mechanism, provides: accepting not bursty connections and guaranteeing the Quality of Service requested at connection setup, accepting very bursty connections and guaranteeing a minimal Quality of Service rather than simply rejecting them, protecting the network from potentially too bursty traffic, determining a bandwidth reservation method based on a Mean Burst Length, for every connection, minimizing the bandwidth reservation while satisfying the required Quality of Service.

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