scope:

The present document defines a consistent terminology for the formalized definition of quality of service (QoS) parameters and their computation. In doing so, it carefully distinguishes between measurable quantities and associated statistical aggregation formulas. For frequently used types of quantities and aggregations, generic symbols and calculation formulas are specified.

For a large class of QoS parameters, which are basically determined by the observation of events, the present document specifies a methodology for constructing definitions in two stages, using the concept of abstract events and their representation by technical events at well-defined points of observation.

In addition, a framework is presented which indicates how QoS parameters may be derived in a generic way via subdividing the usage of a service into meaningful sub-transactions, called "phases".