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Performance Management in ATM Networks

Title of Dissertation: PERFORMANCE MANAGEMENT IN ATM NETWORKS Anubhav Arora, Doctor of Philosophy, 2002 Dissertation directed by: Professor John S. Baras Department of Electrical and Computer Engineering ATM is representative of the connection-oriented resource provisioning class of protocols. The ATM network is expected to provide end-to-end QoS guarantees to connections in the form of bounds on delays, errors and/or losses. Performance management involves measurement of QoS parameters, and application of control measures (if required) to improve the QoS provided to connections, or to improve the resource utilization at switches. QoS provisioning is very important for realtime connections in which losses are irrecoverable and delays cause interruptions in service. QoS of connections on a node is a direct function of the queueing and scheduling on the switch. Most scheduling architectures provide static allocation of resources (scheduling priority, maximum buffer) at connection setup time. Endto-end bounds are obtainable for some schedulers, however these are precluded for heterogeneously composed networks. The resource allocation does not adapt to the QoS provided on connections in real time. In addition, mechanisms to measure the QoS of a connection in real-time are scarce. In this thesis, a novel framework for performance management is proposed. It provides QoS guarantees to real time connections. It comprises of in-service QoS monitoring mechanisms, a hierarchical scheduling algorithm based on dynamic priorities that are adaptive to measurements, and methods to tune the schedulers at individual nodes based on the end-to-end measurements. Also, a novel scheduler is introduced for scheduling maximum delay sensitive traffic. The worst case analysis for the leaky bucket constrained traffic arrivals is presented for this scheduler. This scheduler is also implemented on a switch and its practical aspects are analyzed. In order to understand the implementability of complex scheduling mechanisms, a comprehensive survey of the state-of-the-art technology used in the industry is performed. The thesis also introduces a method of measuring the one-way delay and jitter in a connection using in-service monitoring by special cells. PERFORMANCE MANAGEMENT IN ATM NETWORKS