Summary

Recommendation ITU-T E.802 provides a framework and methodologies for the identification of QoS criteria relevant to users and guidelines for conversion of these criteria into QoS parameters that can be used to evaluate the QoS of telecommunication services.

Guidelines are also given to obtain user's QoS requirements and to prioritize the criteria or parameters. All these may be applied to services supported by the terrestrial and wireless legacy networks as well as services supported by the emerging IP network.

Amendment 1 incorporates Annex A, which provides guidance on the selection of representative samples in the measurement of QoS parameters. At the time of publication Recommendation ITU‑T E.802 had opted not to give this guidance because "the selection of representative samples is a process that is heavily influenced by specific technical and operational conditions of the measurement task." (see clause 8.5). Annex A therefore provides guidance that takes into account these technical (statistical) and operational (practical QoS data collection) conditions by proposing a simple random sampling methodology.

Amendment 1 also adds Appendices IV and V with additional information on the implementation of the sampling algorithm included in Annex A, and on the use of sample-based QoS parameters.

Amendment 2 adds analysis and information on the degree of variability function defined in Annex A.

The electronic attachment that was introduced by Amendment 1, and which contains sample calculator files, is not included with this issue of Amendment 2, but remains available bundled with Amendment 1.