# Effects of Packet Loss and Jitter on VoLTE Call Quality

## TL;DR

This study analyzes how packet loss and jitter affect VoLTE call quality, comparing AMR and AMR-WB codecs over millions of calls using an enhanced E-Model, revealing differences in robustness and quality dependence.

## Contribution

It provides a comparative analysis of VoLTE call quality with two codecs, highlighting their robustness and the different relationships between packet loss and call quality.

## Key findings

- AMR-WB calls are more robust against network impairments.
- Call quality dependence on packet loss is exponential for AMR.
- Call quality dependence on packet loss is nearly linear for AMR-WB.

## Abstract

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