Tra c Management for the Available Bit Rate ABR Service in Asynchronous Transfer Mode ATM Networks

With the merger of telecommunication entertainment and computer industries computer networking is adopting a new paradigm called Asynchronous Transfer Mode ATM networking ATM networks have multiple service classes allow audio video and data to share the same network Of these the Available Bit Rate ABR service class is designed to e ciently support data tra c Tra c management involves the design of a set of mechanisms which ensure that the network bandwidth bu er and computational resources are e ciently utilized while meeting the various Quality of Service QoS guarantees given to sources as part of a tra c contract The general problem of network tra c management in volves all the available tra c classes In this dissertation we address the problem of designing tra c management mechanisms for one class the ABR service class in ATM networks We consider ve aspects of this problem in this dissertation First the ABR service requires a mechanism to carry rate feedback from the network switches to the sources We design three switch algorithms the OSU scheme the ERICA and ERICA schemes which calculate the rate allocations to satisfy di erent sets of goals Second we design a set of source end system mechanisms which respond to network feedback and perform control in the case when feedback is disrupted or is stale Third we validate the performance of the service for various ABR and VBR demand ii patterns Speci cally we study the case of Internet tra c over ATM ABR Fourth we consider the switch design issues for a speci c ABR framework option called the Virtual Source Virtual Destination option Finally we discuss cost performance issues pertaining to the implementation of the service In summary this dissertation work addresses fundamental issues in ATM ABR tra c management and the techniques developed are applicable to a wider class of high speed packet networks