Implementation of Basic Qos Mechanisms on Videoconferencing Network Model

This article investigates the problem of the quality of service decrease in CARNet network during high videoconferencing traffic. The main objective of this research is to apply different queuing methods, i.e. FIFO, Priority Queuing and Weighted Fair Queuing on the proposed network. The ultimate objective is to create a model for the quality of service performance measurement based on the CARNet network. To fully perceive the effects of the queuing mechanisms, a default network model will be simulated with low, medium and high traffic and will be compared to a network model with applied queuing mechanisms. Comparative analysis will yield a conclusion which will determine the best queuing mechanism for the given CARNet network. One method of QoS improvement is a User-Oriented QoS Streaming System that can achieve perceptible satisfaction based on novel streaming and media differentiation policies in DiffServ networks. This method proposes Dynamic QoS Queue Mapping (DQ M) mechanism dynamically controls queue scheduling by adaptively maximizing the utilization of queues and network resources according to the soft states of the DiffServ network. DQ M algorithm can improve the fairness and efficiency of resource utilization for lowpriority queues [5]. Another approach is a cost-based admission control (CBAC) which is a novel approach to preserve QoS in Internet Commerce systems. CBAC is a dynamic mechanism which uses a congestion control technique to maintain QoS while the system is online. Rather than rejecting customer requests in a high-load situation, a discount-charge model (which is sensitive to system current load and navigational structure) is used to encourage customers to postpone their requests. A scheduling mechanism with load forecasting is used to schedule user's 2