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Performance Characterization and Call Reliability Diagnosis Support for Voice over LTE

Published: 07 September 2015 Publication History

Abstract

To understand VoLTE performance in a commercial deployment, in this paper we conduct the first comprehensive performance characterization of commercially deployed VoLTE, and compare with legacy call and over-the-top (OTT) VoIP call. We confirm that VoLTE excels in most metrics such as audio quality, but its call reliability still lags behind legacy call for all the three major U.S. operators. We propose an on-device VoLTE problem detection tool, which can capture new types of problems concerning audio quality with high accuracy and minimum overhead, and perform stress testing on VoLTE call's reliability. We discover 3 instances of problems in the early deployment of VoLTE lying in the protocol design and implementation. Although the identified problems are all concerned with the immature LTE coverage in the current deployment, we find that they can cause serious impairment on user experience and are urgent to be solved in the developing stage. For example, one such instance can lead to up to 50-second-long muting problem during a VoLTE call! We perform in-depth cross-layer analysis and find that the causes are rooted in the lack of coordination among protocols designed for different purposes, and invalid assumptions made by protocols used in existing infrastructure when integrated with VoLTE. We summarize learnt lessons and suggest solutions.

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            cover image ACM Conferences
            MobiCom '15: Proceedings of the 21st Annual International Conference on Mobile Computing and Networking
            September 2015
            638 pages
            ISBN:9781450336192
            DOI:10.1145/2789168
            Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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            Published: 07 September 2015

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            Author Tags

            1. QoE
            2. VoIP
            3. trouble shooting cellular network
            4. volte

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            • (2024)A Unified Prediction Framework for Signal Maps: Not All Measurements are Created EqualIEEE Transactions on Mobile Computing10.1109/TMC.2022.322177323:1(70-89)Online publication date: Jan-2024
            • (2023)When Good Turns Evil: Encrypted 5G/4G Voice Calls Can Leak Your Identities2023 IEEE Conference on Communications and Network Security (CNS)10.1109/CNS59707.2023.10288900(1-9)Online publication date: 2-Oct-2023
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