Speech and multimedia Transmission Quality (STQ); Transmission requirements for wideband wireless terminals (handset and headset) from a QoS perspective as perceived by the user (V1.2.1)
The present document provides speech transmission performance requirements for wireless terminals; it addresses all types of wireless terminals@ including softphones. The present document addresses handset and headset functions of wideband wireless terminals. Differently from 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 present document 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 environments. Related requirements and test methods will be defined in the present document. For all the functions@ the present document 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.