ON APPLICATION-PERCEIVED QUALITY OF SERVICE IN WIRELESS NETWORKS

Wireless and Mobile Internet have changed the way people and businessesoperate. Communication from any Internet access point, including wirelessnetworks such as UMTS, GPRS or WLAN has enabled organizations to havea mobile workforce. However, networked applications such as web, email,streaming multimedia etc. rely upon the ability of timely data delivery. Theachievable throughput is a quality measure for the very task of a communicationsystem, which is to transport data in time. Throughput is thus oneof the most essential enablers for networked applications. While in general,throughput is defined on network or transport level, the application-perceivedthroughput reflects the Quality of Service from the viewpoints......
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ON APPLICATION-PERCEIVED QUALITY OF SERVICE IN WIRELESS NETWORKSON APPLICATION-PERCEIVEDQUALITY OF SERVICEIN WIRELESS NETWORKS Stefan ChevulBlekinge Institute of TechnologyLicentiate Dissertation Series No. 2006:11School of EngineeringOn Application-Perceived Quality of Service in Wireless Networks Stefan ChevulBlekinge Institute of Technology Licentiate Dissertation Series No 2006:11 ISSN 1650-2140 ISBN 91-7295-096-X On Application-Perceived Quality of Service in Wireless Networks Stefan Chevul Department of Telecommunication Systems School of Engineering Blekinge Institute of Technology SWEDENc� 2006 Stefan ChevulDissertation Series No. 2006:11ISSN 1650-2140ISBN 91-7295-096-X© 2006 Stefan ChevulDepartment of Telecommunication SystemsDepartment of Telecommunication SystemsSchool of EngineeringSchool of EngineeringPublisher: Blekinge Institute of TechnologyBlekinge Institute of TechnologyPrinted by Kaserntryckeriet, Karlskrona, Sweden 2006ISBN 91-7295-096-XPrinted by Kaserntryckeriet AB, Karlskrona, SwedenThis publication was typeset using L TEX. ATo my family.AbstractWireless and Mobile Internet have changed the way people and businessesoperate. Communication from any Internet access point, including wirelessnetworks such as UMTS, GPRS or WLAN has enabled organizations to havea mobile workforce. However, networked applications such as web, email,streaming multimedia etc. rely upon the ability of timely data delivery. Theachievable throughput is a quality measure for the very task of a communi-cation system, which is to transport data in time. Throughput is thus oneof the most essential enablers for networked applications. While in general,throughput is defined on network or transport level, the application-perceivedthroughput reflects the Quality of Service from the viewpoints of the applica-tion and user. The focus of the thesis is on the influence of the network on the application-perceived Quality of Service and thus the user perceived experience. Ananalysis of application based active measurements mimicking the needs ofstreaming applications is presented. The results reveal clear influence of thenetwork on the application-perceived Quality of Service seen from variationsof application-perceived throughput on small time scales. Results also indi-cate that applications have to cope with considerably large jitter when tryingto use the nominal throughputs. It was observed that the GPRS network hadconsiderable problems in delivering packets in the downstream direction evenwhen the nominal capacity of the link was not reached. Finally, the thesis discusses the suitability of wireless networks for differentmobile services, since the influence of the network on the application-perceivedQuality of Service is of great significance when it comes to customer satisfac-tion. Therefore, application-perceived Quality of Service in wireless networksmust also be considered by the mobile application programmer during theapplication development. viiPrefaceThis thesis reports on my research in the field application-perceived Qual-ity of Service. The work was done at the School of Engineering at BlekingeInstitute of Technology (BTH) in the context of the Personal Informationfor Intelligent Transport Systems through Seamless communications and Au-tonomous decisions (PIITSA) project funded by the Swedish Agency for In-novation Systems VINNOVA (project number 2003-02873), www.vinnova.se.Other partners are: Saab Communication in V¨xj¨; the Swedish National a oTesting and Research Institute (SP), and the Swedish National Road Admin-istration (V¨gverket). Parts of my research material have been published in athe following publications: 1. Stefan Chevul, Johan Karlsson, Lennart Isaksson, Markus Fiedler, Pe- ter Lindberg and Lars Strand´n. Measurement of Application-Perceived e Throughput in DAB, GPRS, UMTS and WLAN Environments. In Pro- ceedings of RVK’05, June 2005, Link¨ping, Sweden. o 2. Markus Fiedler, Stefan Chevul, Lennart Isaksson, Peter Lindberg and Johan Karlsson. Generic Communication Requirements of ITS-Related Mobile Services as Basis for Automatic Network Selection. In Proceed- ings of NGI’05, April 2005, Rome, Italy. 3. Stefan Chevul, Lennart Isaksson, Markus Fiedler and Peter Lindberg, Measurement of Application-Perceived Throughput of an E2E VPN Con- nection Using a GPRS Network, In Second International Workshop of the EURO-NGI Network of Excellence, LNCS Volume 3883 / 2006, pp. 255 – 268, July 13-15, 2005, Villa Vigoni, Italy. ix 4. Lennart Isaksson, Stefan Chevul, Markus Fiedler, Johan Karlsson and Peter Lindberg. Application-Perceived Throughput Process in Wireless Systems. In Proceedings of ICMCS’05, August 2005, Montreal, Canada. 5. Markus Fiedler, Lennart Isaksson, Stefan Chevul, Peter Lindberg and Johan Karlsson, Measurements and Analysis of Application-Perceived Throughput via Mobile Links, In Proceedings of the 2005 3ed Perfor- mance Modeling and Evaluation of Heterogeneous Networks (HET- NETs) T06, July 18-2, 2005, Ilkley, West Yorkshire, U.K. 6. Peter Lindberg, Stefan Chevul, Roland Waltersson, Markus Fiedler and Lennart Isaksson. Seamless Communication for ITS Applications. In Proceedings of 13th World Congress of ITS, October 2006, London, England. ...