Quality aspects of internet telephony

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MARC

Marsh, Ian,1965-RISE,KTH,Kommunikationsnät,SICS (author)

Quality aspects of internet telephony

BookEnglish2009

Publisher, publication year, extent ...

Stockholm :KTH,2009
89 s.
electronicrdacarrier

Numbers

LIBRIS-ID:oai:DiVA.org:kth-10572
ISBN:9789174153132
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10572URI
https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-23578URI

Supplementary language notes

Language:English
Summary in:English

Part of subdatabase

SwePubSwePub

Classification

Subject category:vet swepub-contenttype
Subject category:dok swepub-publicationtype

Series

TRITA-EE,1653-5146 ;2009:025
SICS Dissertation Series ;51

Notes

QC 20100802
Also identified as KTH publication TRITA-EE 2009:025
Internet telephony has had a tremendous impact on how people communicate.Many now maintain contact using some form of Internet telephony.Therefore the motivation for this work has been to address the quality aspectsof real-world Internet telephony for both fixed and wireless telecommunication.The focus has been on the quality aspects of voice communication,since poor quality leads often to user dissatisfaction. The scope of the workhas been broad in order to address the main factors within IP-based voicecommunication.The first four chapters of this dissertation constitute the backgroundmaterial. The first chapter outlines where Internet telephony is deployedtoday. It also motivates the topics and techniques used in this research.The second chapter provides the background on Internet telephony includingsignalling, speech coding and voice Internetworking. The third chapterfocuses solely on quality measures for packetised voice systems and finallythe fourth chapter is devoted to the history of voice research.The appendix of this dissertation constitutes the research contributions.It includes an examination of the access network, focusing on how calls are multiplexed in wired and wireless systems. Subsequently in the wireless case, we consider how to handover calls from 802.11 networks to the cellularinfrastructure. We then consider the Internet backbone where most of ourwork is devoted to measurements specifically for Internet telephony. The applications of these measurements have been estimating telephony arrival processes, measuring call quality, and quantifying the trend in Internet telephony quality over several years. We also consider the end systems, since they are responsible for reconstructing a voice stream given loss and delay constraints. Finally we estimate voice quality using the ITU proposal PESQ and the packet loss process.The main contribution of this work is a systematic examination of Internet telephony. We describe several methods to enable adaptable solutions for maintaining consistent voice quality. We have also found that relatively small technical changes can lead to substantial user quality improvements.A second contribution of this work is a suite of software tools designed to a certain voice quality in IP networks. Some of these tools are in use within commercial systems today.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Telekommunikation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications hsv//eng
NATURVETENSKAP Data- och informationsvetenskap hsv//swe
NATURAL SCIENCES Computer and Information Sciences hsv//eng
Telecommunication
Telekommunikation
VoIP

Added entries (persons, corporate bodies, meetings, titles ...)

Gunnar, Karlsson,ProfessorKTH,Kommunikationsnät(Swepub:kth)u1orxwa1 (thesis advisor)
Schulzrinne, Henning,ProfessorDepartment of Computer Science, Columbia University, NY (opponent)
KTHKommunikationsnät (creator_code:org_t)

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Telecommunicatio ...

NATURAL SCIENCES: NATURAL SCIENCES; and Computer and Inf ...

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By the university: Royal Institute of Technology; RISE

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