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P. Reichl, J. Fabini, M Happenhofer, C. Egger:
"From QoS to QoX: A Charging Perspective";
Talk: 18th ITC Specialist Seminar on Quality of Experience, Karlskrona, Sweden; 05-29-2008 - 05-30-2008; in: "Proceedings of the 18th ITC Specialist Seminar on Quality of Experience", Proceedings 18th ITC Specialist Seminar on Quality of Experience, Blekinge Institute of Technology, Research Report No. 2008:03 (2008), ISSN: 1103-1581; 35 - 44.

Quality-of-Service differentiation has traditionally been one of the key drivers for pricing current and future Internet services. As a result, a broad range of QoS-based charging mechanisms have been proposed, ranging from Paris Metro Pricing over Effective Bandwidth Charging up to the Cumulus Pricing Scheme or the Contract-Balancing Mechanism. The recent interest in Quality-of-Experience (QoE/QoX), however, so far has not led to a similar burst of research activity in the Internet Economics community.
This paper starts with reviewing and discussing the most prominent QoS-based charging schemes and provides some discussion on lessons learned before investigating the transition from QoS to QoX from a charging perspective. Some recent proposals for pricing QoX are introduced and a prototypical implementation in the framework of an open source 3GPP IMS (IP Multimedia Subsystem) project is presented. The paper ends with an out-look on current and future work in this highly interesting re-search field.

Quality-of-Service differentiation has traditionally been one of the key drivers for pricing current and future Internet services. As a result, a broad range of QoS-based charging mechanisms have been proposed, ranging from Paris Metro Pricing over Effective Bandwidth Charging up to the Cumulus Pricing Scheme or the Contract-Balancing Mechanism. The recent interest in Quality-of-Experience (QoE/QoX), however, so far has not led to a similar burst of research activity in the Internet Economics community.
This paper starts with reviewing and discussing the most prominent QoS-based charging schemes and provides some discussion on lessons learned before investigating the transition from QoS to QoX from a charging perspective. Some recent proposals for pricing QoX are introduced and a prototypical implementation in the framework of an open source 3GPP IMS (IP Multimedia Subsystem) project is presented. The paper ends with an out-look on current and future work in this highly interesting re-search field.

Quality-of-Service, Quality-of-Experience, Internet Economics, Charging, IP Multimedia Subsystem