Performance of an ATM multiplexer and a connectionless server in ATM networks

Abstract

The main objective of this dissertation work is to investigate the performances of traffic control schemes for an asynchronous transfer mode (ATM) multiplexer and a connectionless server (CLS) for high-speed integrated broadband networks. Due to a flexible and dynamic nature of ATM and the heterogeneity of quality of services (QoSs) in a broadband integrated services digital network (B-ISDN) environment, an effective overall traffic control strategy in the ATM layer which will play a critical role in the ultimate success of B-ISDN should be defined. Thus, accurate traffic modeling and performance estimation of traffic control schemes should first be accomplished for network dimensioning, determination of control parameters, connection admission control (CAC) scheme, etc. In this dissertation we first study an ATM multiplexer with selective cell discarding (SCD), and propose as a new traffic parameter the ratio of high and low priority cell streams when a cell stream multiplexed is classified by the cell loss priority (CLP) field in a cell header. By having loss priority control, it is possible to increase the multiplexing gain. For performance analysis we assume that an on-off bursty traffic is described with several traffic parameters and the proposed priority ratio, and is approximately modeled by a Markov-modulated deterministic process (MMDP). Assuming that several independent and homogeneous on-off bursty traffics with priority discrimination are multiplexed by an ATM multiplexer with one or two thresholds, we present an analytical procedure for the cell loss probability of each priority level in statistical cell multiplexing with the threshold renewal assumption, and use the performance results for CAC. Also, we consider the effect of the proposed priority ratio. Although loss priority control increases the statistical multiplexing gain, it is not appropriate for the on-off bursty traffic to change the value of the high-priority ratio in order to obtain a...