ITU-T E.840 PDF

The Recommendation specifies a statistical framework, as well as benchmarking scenarios and conditions within which it can be applied, whose use is required by operators and regulators when qualifying and quantifying performance differences between end-to-end key performance indicators (KPIs) or key quality indicators (KQIs) affecting the user experience.

The need for this Recommendation arises because, in the intense race to satisfy increasingly demanding existent users while expanding customer bases at optimal cost, operators have improved network performance to such an extent that differences between them have become smaller and smaller.