Evaluation of QoS in internet accesses for multimedia applications (EQoSIM)

This paper presents a Java-based on-line Quality of Service (QoS) estimation system for Internet accesses specially aimed at real-time multimedia applications. The system is capable of estimating access capacity, available bandwidth and delay as the critical QoS parameters for this kind of applications, and to do it from the point of view of the final user. The algorithm selected for QoS estimations is one-way, and is based on the packet train technique. The system has been developed following the client-server model, where a central web server contains, among other things, the Java applet that implements the client side of the system, and has been validated using several commercial Internet accesses with different technologies: analog modem, Asymmetric Digital Subscriber Loop (ADSL), cable modem and Universal Mobile Telecommunications System (UMTS).