Summary and Highlights

The importance of the Internet for social and economic ends has increased over the last years, especially due to the large market growth for smartphones and tablet computers. However, the mechanisms used for traffic management in the Internet are still based on concepts unchanged since its initial inception and cannot cope with the increasing requirements of users, network operators and service providers, such as the Quality of Experience (QoE) perceived by the user and economic considerations of the service providers.
In order to deal with the new requirements, the project ÖkoNet considers the economic interests of all involved stakeholders during the design of new traffic management mechanisms. One example for this is the efficient transmission of video content studied during the first phase of ÖkoNet. Here, the QoE, energy consumption of user equipment and costs for the network operators were considered. A QoE Monitoring mechanism was developed for this scenario which was implemented at a mobile network operator. Furthermore, the developed QoE models were recommended for ITU standardisation.
In the second phase of this project, the applicability of traffic management mechanism design principles was studied. A special focus was put on the efficient distribution of video content using HTTP adaptive streaming in content centric networks (CCN) and in particular the performance of video dissemination regarding QoE, cost of inter-domain traffic and efficient use of available video sources. As a result an exemplary QoE-based resource management approach was developed that uses network information, application information and social information.  
The second phase of the ÖkoNet project showed the benefits of collaborative approaches, e.g., when exchanging information between network and application. Today, these approaches can already be realized using software defined networking (SDN). Current developments, however, show an opposing trend. An increasing number of service providers try to optimize their service quality on their own. Additionally, more and more services use end-to-end encryption, which prevents network providers from using, e.g., deep packet inspection to extracting information for application-oriented network optimization. End-to-end encryption and the lack of collaboration between network and service providers make it hard or even impossible to realize economic traffic management (ETM) approaches nowadays.
Phase three of the Ökonet project focuses on how to optimize end-user QoE and resource consumption if there is no or only little collaboration between network and service providers. The first scenario in the project considers web browsing via an encrypted connection. After classifying web pages into different types, appropriate web QoE models for the different web page classes will be derived. Based on these models, new QoE monitoring methods for encrypted traffic will be developed, and their accuracy is evaluated. These monitoring methods can later be used by network providers to optimize their resource management while maintaining a positive end- user experience. The second scenario considers a software defined network with a central controller that can dynamically change and reroute network flows. The goal of this scenario is to analyze using queuing theory, if the blockchain technology is suitable for dynamically negotiating resources and controlling service level agreements (SLAs) between infrastructure and service provider. This approach will, according to the Design for Tussle principle, strengthen the competition among infrastructure providers and consequently enable service providers to obtain better SLAs for lower costs. Both scenarios result in enabling and controlling QoE based experience level agreements (ELAs). 
 
Highlights
Hoßfeld, T., Metzger, F., Rossi, D. (2018). Speed Index: Relating the industrial Standart for users perceived web performance to web QoE. Quality of Multimedia Experience. 
Skorin-Kapov, L., Varela, M., Hoßfeld, T., Chen, K.-T. (2018). A survey of emerging concepts and challenges for QoE management of multimedia services. ACM Transactions on Multimedia Computing, Communications, and Applications 14.2
Hoßfeld, T., Heegaard, P. E., Varela, M., & Möller, S. (2016). QoE beyond the MOS: an in-depth look at QoE via better metrics and their relation to MOS. Quality and User Experience, 1(1), 2.
Seufert, M., Egger, S., Slanina, M., Zinner, T., Hoßfeld, T., Tran-Gia, T. (2015). A survey on quality of experience of http adaptive streaming. IEEE Communications Surveys & Tutorials 17.5
Hoßfeld, T., Seufert, M., Sieber, C., Zinner, T., & Tran-Gia, P. (2015). Identifying QoE optimal adaptation of HTTP adaptive streaming based on subjective studies. Computer Networks, 81, 320-332.
IEEE Transactions on Multimedia article "Best Practices for QoE Crowdtesting: QoE Assessment with Crowdsourcing", volume 16, Feb. 2014.
T. Hoßfeld and P. Tran-Gia receive Fred W. Ellersick prize 2013 for the best article published in a Communications Society magazine in the previous 3 calendar years
Best paper award at QcMAN 2013: "Implementation and User-centric Comparison of a Novel Adaptation Logic for DASH with SVC", PDF 
Best paper award at FINGNet-2012: "Passive YouTube QoE Monitoring for ISPs", 2012

Funding: The project OekoNet is funded by Deutsche Forschungsgemeinschaft (DFG) in the subject area "Operating, Communication and Information Systems" since 2012. Research grant holders are Tobias Hoßfeld (University of Würzburg, Chair of Communication Networks) and Phuoc Tran-Gia (University of Würzburg, Chair of Communication Networks) under grants HO 4770/1-1 and TR257/31-1: "Design and Performance Evaluation of New Mechanisms for the Future Internet – New Paradigms and Economic Aspects". The  original German title of the project is "Entwurf und Bewertung neuer Mechanismen für das Internet der Zukunft - Neue Paradigmen und ökonomische Aspekte (ÖkoNet)".