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Testing the IQX Hypothesis for Exponential Interdependency between QoS and QoE of Voice Codecs iLBC and G.711
Blekinge Institute of Technology, School of Engineering, Department of Telecommunication Systems.
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2008 (English)Conference paper, (Refereed)
Abstract [en]

Given the growing importance of quantitative relationships between user-perceived Quality of Experience (QoE) and network Quality of Service (QoS), this paper investigates the IQX hypothesis for two voice codecs, iLBC and G.711. This hypothesis expresses QoE as an exponential function of QoS degradation. The experiments are carried out in a controlled environment using the softphone SJPhone, the network emulator NIST Net, and a tool calculating the PESQ (Perceptual Evaluation of Speech Quality) from sent and received audio files. The IQX hypothesis is confirmed exactly for disturbances perceived on applications level, packet loss and packet reordering, which clearly correlate to the main sensitivities of the used softphone to packet-level disturbances such as loss, jitter and reordering. So, besides of providing a unified relationship between QoE and QoS, the IQX also proved to be capable of identifying the QoS parameters of relevance for QoE degradations. The study also points out interesting tracks for future work in terms of QoS degradations and related QoE evaluations.

Abstract [sv]

Pappret belyser den exponentiella påverkan av tjänstekvalitetsstörningar (såsom dataförlust, fördröjningar och reordering) på upplevt tjänstekvalitet, fokusserat på populära röst-kodningsalgoritmer såsom G.711 och iLBC (som används av Skype). QoS, QoE, upplevt tjänstekvalitet, mätningar, nätverksemulering

Place, publisher, year, edition, pages
Karlskrona: BTH , 2008.
Keyword [en]
IQX hypothesis, QoS, QoE, measurements, VoIP, iLBC, G.711, network emulation, NIST Net
National Category
Telecommunications Computer Science
Identifiers
URN: urn:nbn:se:bth-8457Local ID: oai:bth.se:forskinfo3FEFF642DE524996C12574A7002F4034ISBN: ISSN 1103-1581 (print)OAI: oai:DiVA.org:bth-8457DiVA: diva2:836181
Conference
18th ITC Specialist Seminar on Quality of Experience
Note

Published in: 18th ITC Specialist Seminar on Quality of Experience http://www.bth.se/fou/forskinfo.nsf/3efcc0263496fe93c125681f0031bfd0/36404155081 45c5fc12574fe0052d5a4!OpenDocument

Available from: 2012-09-18 Created: 2008-08-16 Last updated: 2016-09-07Bibliographically approved

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  • apa
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More styles
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Output format
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