This paper described certain problems when performing QoS active measurement. The term Test Traffic Influence Factor (TTIF), describing quantitatively influence which the test traffic compared to actual traffic on Qos parameters is defined. A kind of ideal model based on the queue theory to study TTIF is build up and a TTIF for delay is discussed. The theoretical analysis results are verified by using network simulation tool-OPNET modeler. Then certain important conclusions and advice about IP network QoS measurement are given and further research direction is directed.
The QoS measurement and monitoring framework proposed for Diff-Serv consists of three conceptual modules, the QoS data acquisition agent, the Qos data correlating agent and the QoS data analysis agent. The Common Object Request Broker Architecture (CORBA) is used when implementing the frame. The constructing of the measurement package, the transmitting rule of active measurement packages and path measurement is studied. A abbreviated QoS data correlating and analyzing is introduced.