ETSI - TS 103 738
Speech and multimedia Transmission Quality (STQ); Transmission requirements for narrowband wireless terminals (handsfree) from a QoS perspective as perceived by the user
|Publication Date:||1 October 2018|
The present document provides speech transmission performance requirements for wireless terminals; it addresses all types of wireless terminals, including softphones. This part addresses handsfree function of narrowband wireless terminals.
In contrast to other standards which define minimum performance requirements it is the intention of the present document to specify terminal equipment requirements which enable manufacturers and service providers to enable good quality end-to-end speech performance as perceived by the user, whatever be the radio link (terminals may implement different radio links with the access network).
When an additional radio link between the terminal and external electroacoustical devices is used (e.g. Bluetooth® link), the standard will address the overall quality.
In the present document, objective measurement methodologies and requirements for wireless speech terminals are given.
In addition to basic testing procedures, the present document describes advanced testing procedures taking into account further quality parameters as perceived by the user.
The requirements available in the present document will ensure a high compatibility across access networks with all types of terminals.
It is the aim to optimize the listening and talking quality, conversational performance, as well as the use in noisy environment. Related requirements and test methods will be defined in the present document.
For all the functions, the standard will consider the limitations in audio performance due to different form factors (e.g. size, shape).
Terminals which are not intended to be connected to public networks are outside the scope of the present document.