ITU-T Q.3925 PDF

The Q.39xx-series of Recommendations relates to testing methods and specifications for model networks. The model network concept was created in 2006 due to the complexity of next generation network (NGN) equipment over digital networks, the unlimited services set in principle, the level of guaranteed quality of service (QoS) for separated QoS classes, and so on. The global interoperability concept was also created as a next step in testing methodology. Global interoperability includes the interoperability of technical means, of services, and of QoS classes and parameters.

The modern type of traffic is required to realize the testing of global interoperability on the model network. In general, voice traffic flow has been digital network traffic flow. Over a long period of time, voice traffic flow characteristics were obtained in the real networks and these characteristics are standardized in [ITU-T Q.543], in accordance with statistical data.

The NGN traffic contains voice traffic, data traffic, and video traffic. As a rule, data and video traffic have different characteristics than voice traffic in the circuit switched network. Data and video traffic in the NGN are self-similar. Consequently, the new methods for traffic generation and modelling should be used in the testing procedure for global interoperability.

This Recommendation describes the voice, data, and video traffic flow characteristics which should be generated for testing global interoperability parameters on the model network. Traffic characteristics of the ubiquitous sensor network (USN) are also described in this Recommendation.