scope:

The present document serves as a generic umbrella document for the further documents part 2 to part 8 of this series. It gives an overview over the topics addressed by these documents and enables the reader to work with the documents in the intended way. It is important to understand that the complete series of documents focuses on Quality of Service which stands for the objective discussion of quality measures from a rather technical perspective. Based on existing quality standards and further definitions, a complete picture of Quality of Service as seen from a user's point of view is drawn.

Wherever possible, existing ITU-T or ETSI definitions are referenced. If ITU-T or ETSI definitions do not exist or are considered as too generic, a more service and mobile network specific definition is made.

The present document comprises the theoretical backgrounds to understand terms like "Quality of Service", "Network Performance" and "Quality of Experience". Their meaning and interrelation are discussed by taking different QoS models into account.