Testing of VoLTE mean opinion score in reverberation chambers. Issue 8 (24th September 2020)

• Record Type: Journal Article
• Authors: Barazzetta, Massimo; Colombo, Michele; Bastianelli, Luca; Moglie, Franco; Mariani Primiani, Valter; Diamanti, Riccardo; Micheli, Davide
• Is Part Of: IET science, measurement & technology. Volume 14:Issue 8(2020)
• Page Start: 949
• Page End: 954
• Publication Date: 2020-09-24
• Subjects: radiofrequency interference -- 3G mobile communication -- mobility management (mobile radio) -- quality of service -- Long Term Evolution -- telecommunication traffic -- radio access networks -- cellular radio -- radiowave propagation -- reverberation chambers; single radio voice call continuity -- radio access technologies -- VoLTE mean opinion score -- reverberation chamber -- call testing campaign -- long term evolution -- radio access network -- voice call -- electromagnetic propagation environment -- signal strength -- reference signal -- signal‐to‐interference noise ratio -- radio propagation environment -- perceived quality -- networks technology -- voice quality -- radio path loss -- mutual radio interference -- Telecom Italia mobile -- voice over long term evolution -- mean opinion score -- perceived speech quality -- traffic load -- LTE evolved Node B -- quality of service -- handover trigger -- UMTS -- GSM -- adaptive multirate CoDec; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2019.0385
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : In this study, the authors present results of a call testing campaign using voice over long term evolution (VoLTE) technology on the radio access network of the operator Telecom Italia mobile. The quality of the voice call is expressed by means of the mean opinion score (MOS). The electromagnetic propagation environment has been reproduced within a reverberation chamber, and its effect on MOS has been evaluated by varying the signal strength, i.e. the reference signal received power and the signal‐to‐interference noise ratio. The aim is to find a correlation between the radio propagation environment and the perceived quality of the speech. Regardless of the networks technology, voice quality could be impacted by several factors: traffic load of LTE evolved Node B, quality of service, radio pathloss, mutual radio interference, multipath and so on. Interference and multipath are added to the useful signal in order to deteriorate the MOS, until the VoLTE calls dropped. Target of such work is to properly set the thresholds that trigger a handover of single radio voice call continuity to other radio access technologies (UMTS or GSM). Tests take also into account the adaptive multi‐rate CoDec selected by the network.