Modeling of Traffic Engineering Queues with QoS Differentiation

Abstract

The paper analyzes the Class-Based Traffic Engineering Queue (CB-TEQ) model, which provides organization and management of class queues on the router interface, supporting differentiated and balanced packet service. It is demonstrated that the advantage of CB-TEQ lies in the implementation of an optimal interface bandwidth allocation between class queues based on a linear programming problem. At the same time, a shortcoming of the model has been identified, related to the need for heuristic selection of the normalization coefficient. To address this issue, an Enhanced Class-Based Traffic Engineering Queue (ECBTEQ) model is proposed, in which the normalization coefficient is considered as a control variable. This enabled the calculation of the optimal value of the normalization coefficient by solving a nonlinear optimization problem with a modified criterion and a system of constraints. The results of experimental studies confirmed the efficiency of ECB-TEQ, in particular its ability to provide the maximum level of differentiation when servicing packets in different class queues.