Abstract

 
 
 Today, the great challenge in broad band networks, such as ATM, is to support applications that need guaranteed QoS. Efficient resource allocation for connections that need guaranteed QoS is only possible if the application can provide a precise and reliable traffic descriptor that the network can understand. This work presents a methodology to obtain the parameters of the traffic descriptor of an ATM application from an initial sample of the flow. Based on real-time measurements of the flow, we suggest periodic renegotiations of the parameters, every time they vary above or below their predefined limits. We apply this method to a VBR MPEG video flow and demonstrate its performance. Observed results are discussed and some future uses of the methodology are suggested.
 
 
Highlights
Modern broad band application typically require variable band width and specific performance requirements
In order to assess the performance of the practical method in obtaining UPC parameters, an application was sought that were as close as possible to real-time processing, which means that the UPC parameters must be inferred from a small initial sample because such time may be the fixed delay to be introduced on the flow
Considering the dynamic renegotiation of UPC parameters of the virtual connection (VC) from successive segments of traffic flow, one can obtain a dynamic adaptation of the UPC mechanism and, the actual effective connection band, while it is on
Summary
Modern broad band application typically require variable band width and specific performance requirements. ATM technology allows the implementation of a network capable of supporting the QoS requirements of such applications, as long as the application provides the network with a flow of cells within negotiated UPC (user parameter control) parameters This set of UPC parameters is part of the application’s traffic descriptor, which must be able to capture the main statistical characteristics of the flow. The application often has no means to provide precise information about its flow behavior, which forces the network to adopt QoS standards based solely on the application’s service category, which not always translates as an efficient allocation of network resources concerning band and buffer space In such case, a feasible alternative being proposed would be to try to use an initial sample of the flow to infer a set of attempt-parameters and renegotiate them as significant deviations of these parameters from the current flow occur.
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