On-line Internet Access Estimation Tool: EQoSIM

This paper presents a Java-based on-line Internet access estimation tool called evaluation of quality of service (QoS) in Internet accesses for multimedia applications (EQoSIM). It is specially aimed at real-time multimedia applications transported over the user datagram protocol (UDP). The system is capable of estimating access capacity, available bandwidth and delay as the critical end-to-end QoS parameters for this kind of applications. The algorithm used for QoS estimations is one-way, and is based on the packet train technique. On-line QoS estimation elements are distributed among a central server and the final Internet user. The central server contains a UDP packet bursts server and a Web server that hosts the Java applet that implements the UDP packet bursts client. EQoSIM has been validated using several commercial Internet accesses with different technologies: asymmetric digital subscriber loop (ADSL), general packet radio service (GPRS) and universal mobile telecommunications system (UMTS)