Experimental evaluation of WebRTC voice quality in LTE coverage tests

International audienceIn this paper, we present experimental results on WebRTC voice quality as a function of LTE radio coverage. Different LTE radio conditions were tested by varying the radio path loss (with fast fading) in controlled test lab conditions. Voice quality was evaluated at different speech coding bit rates in terms of POLQA score and mouth-to-ear delay. Results show that, with acknowledged mode data transmission over LTE, degrading radio 8 coverage translated mainly into increasing end-to-end delay and 9 jitter, with virtually no packet loss up to the coverage limit. Voice 10 quality is analyzed by studying the influence of the specific jitter 11 buffer used in WebRTC endpoints