Deterministic Rule Based Traffic Descriptors for Broadband ISDN: Worst Case Behavior and Concept of Equivalent Bandwidth

Deterministic rule based traffic descriptors in general, and Leaky Bucket Based (LBB) traffic descriptors in particular, offer many advantages over statistical descriptors for specifying and monitoring traffic in the ATM based Broadband ISDN (B-ISDN). If the quality of service (QOS) required by connections in such a network is to be guaranteed on a connection-basis, the Connection Acceptance Control (CAC) should be based on the worst case traffic compliant with the traffic descriptor (and hence allowed by the monitor). This requirement poses challenges which have not been addressed adequately. Two important challenges are: definition of the worst case behavior and characterization of the worst case traffic compliant with an LBB descriptor, applicability of 'Equivalent Bandwidth' concept to the LBB sources.