TAILIEUCHUNG - ON APPLICATION-PERCEIVED QUALITY OF SERVICE IN WIRELESS NETWORKS

Wireless and Mobile Internet have changed the way people and businesses operate. Communication from any Internet access point, including wireless networks such as UMTS, GPRS or WLAN has enabled organizations to have a mobile workforce. However, networked applications such as web, email, streaming multimedia etc. rely upon the ability of timely data delivery. The achievable throughput is a quality measure for the very task of a communication system, which is to transport data in time. Throughput is thus one of the most essential enablers for networked applications. While in general, throughput is defined on network or transport level, the application-perceived throughput reflects the Quality of Service from the viewpoints | OF SERVICE IN WIRELESS NETWORKS ON APPLICATION-PERCEIVED QUALITY ABSTRACT Wireless and Mobile Internet have changed the the needs of streaming applications is presented. way people and businesses operate. Communica- The results reveal clear influence of the network ON APPLICATION-PERCEIVED tion from any Internet access point, including wi- on the application-perceived QoS seen from varia- reless networks such as UMTS, GPRS or WLAN tions of application-perceived throughput on small QUALITY OF SERVICE has enabled organizations to have a mobile work- time scales. Results also indicate that applications force. However, networked applications such as have to cope with considerably large jitter when IN WIRELESS NETWORKS web, email, streaming multimedia etc. rely upon trying to use the nominal throughputs. It was ob- the ability of timely data delivery. The achievable served that the GPRS network had considerable throughput is a quality measure for the very task problems in delivering packets in downstream di- of a communication system, which is to transport rection even when the nominal capacity of the link data in time. Throughput is thus one of the most was not reached. essential enablers for networked applications. While in general, throughput is defined on net- Finally, the thesis discusses the suitability of wire- work or transport level, the application-perceived less networks for different mobile services, since Stefan Chevul throughput reflects the Quality of Service from the influence of the network on the application- the viewpoints of application and user. perceived Quality of Service is of great significan- ce when it comes to customer satisfaction. The- The focus of the thesis is on the influence of the refore, application-perceived Quality of Service in network on the application-perceived QoS and wireless networks must also be considered by the thus the user perceived experience. An analysis of mobile application programmer during the appli- application based .

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