Performance analysis of traffic control schemes in broadband ATM networks

Abstract

The main objective of this dissertation work is to investigate the performance of traffic control schemes for the high-speed integrated broadband networks. The ATM networks must accommodate diverse types of applications with different quality of services (QOS) and traffic characteristics, which maybe require point-to-point connections or multipoint connections. Thus, in order to increase the utilization of the networks and satisfy the QOS``s of each traffic type, some types of traffic control schemes must be adopted in ATM networks. And the accurate estimation of the performance of traffic control schemes is needed for dimensioning of the networks, determination of control parameters, connection admission control, etc. First, we study the performance of a nonblocking input and output queueing multicast ATM switch with capacity C. A multicast packet switch provides an efficient transport method which can connect any input port to any subset of output ports. Each input packet of the switch is copied to multiple packets with identical payload and destined to a subset of output ports. So, the offered load to output ports increases as the mean number of copy packets generated by one input packet increases in a multicast switch, thus requiring some scheme of speeding up the switch. Our study indicates that the service time involved by packets at the head of input queues becomes a phase-type (PH) process for a large-size switch. With this service time distribution, we analyze the saturation throughput of the switch, input queue length distribution and mean delay using the matrix-geometric solution method. Our numerical and simulation results indicate that the switch capacity 2 is sufficient for adequate multicast switch performance. Also we study the performance of a multicast ATM switch with capacity C which adopts either one of two fanout splitting disciplines, i.e., the first-come-first-served (FCFS) head-of-line (HOL) service discipline and the random HOL servic...