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This work performs a preliminary, comparative analysis of the end-to-endquality guaranteed by Voice over LTE (VoLTE), examining several millions ofVoLTE calls that employ two popular speech audio codecs, namely, AdaptiveMulti-Rate (AMR) and Adaptive Multi-Rate WideBand (AMR-WB). To assess callquality, VQmon, an enhanced version of the standardized E-Model, is utilized.The study reveals to what extent AMR-WB based calls are more robust againstnetwork impairments than their narrowband counterparts; it further shows thatthe dependence of call quality on the packet loss rate is approximatelyexponential when the AMR codec is used, whereas it is nearly linear for theAMR-WB codec.

Effects of Packet Loss and Jitter on VoLTE Call Quality