WFRF:(Karlsson Henning)
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 04501nam a2200457 4500 | |
| 001 | oai:DiVA.org:kth-10572 | |
| 003 | SwePub | |
| 008 | 090527s2009 | |||||||||||000 ||eng| | |
| 009 | oai:DiVA.org:ri-23578 | |
| 020 | a 9789174153132q print | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105722 URI |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-235782 URI |
| 040 | a (SwePub)kthd (SwePub)ri | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a vet2 swepub-contenttype |
| 072 | 7 | a dok2 swepub-publicationtype |
| 100 | 1 | a Marsh, Ian,d 1965-u RISE,KTH,Kommunikationsnät,SICS4 aut0 (Swepub:ri)IanMa@ri.se |
| 245 | 1 0 | a Quality aspects of internet telephony |
| 264 | 1 | a Stockholm :b KTH,c 2009 |
| 300 | a 89 s. | |
| 338 | a electronic2 rdacarrier | |
| 490 | 0 | a TRITA-EE,x 1653-5146 ;v 2009:025 |
| 490 | 0 | a SICS Dissertation Series ;v 51 |
| 500 | a QC 20100802 | |
| 500 | a Also identified as KTH publication TRITA-EE 2009:025 | |
| 520 | a 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. | |
| 650 | 7 | a TEKNIK OCH TEKNOLOGIERx Elektroteknik och elektronikx Telekommunikation0 (SwePub)202042 hsv//swe |
| 650 | 7 | a ENGINEERING AND TECHNOLOGYx Electrical Engineering, Electronic Engineering, Information Engineeringx Telecommunications0 (SwePub)202042 hsv//eng |
| 650 | 7 | a NATURVETENSKAPx Data- och informationsvetenskap0 (SwePub)1022 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Computer and Information Sciences0 (SwePub)1022 hsv//eng |
| 653 | a Telecommunication | |
| 653 | a Telekommunikation | |
| 653 | a VoIP | |
| 700 | 1 | a Gunnar, Karlsson,c Professoru KTH,Kommunikationsnät4 ths0 (Swepub:kth)u1orxwa1 |
| 700 | 1 | a Schulzrinne, Henning,c Professoru Department of Computer Science, Columbia University, NY4 opn |
| 710 | 2 | a KTHb Kommunikationsnät4 org |
| 856 | 4 | u https://kth.diva-portal.org/smash/get/diva2:219379/FULLTEXT01.pdfx primaryx Raw objecty fulltext |
| 856 | 4 | u https://ri.diva-portal.org/smash/get/diva2:1042654/FULLTEXT01.pdfx primaryx Raw objecty fulltext:print |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10572 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-23578 |
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