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Fiedler, Markus
Publications (10 of 190) Show all publications
Fiedler, M., Moller, S., Reichl, P. & Xie, M. (2018). A Glance at the Dagstuhl Manifesto 'QoE Vadis?'. In: 2018 10th International Conference on Quality of Multimedia Experience, QoMEX 2018: . Paper presented at 10th International Conference on Quality of Multimedia Experience, QoMEX 2018, 29 May 2018 through 1 June 2018, Sardinia, Italy. Institute of Electrical and Electronics Engineers Inc., Article ID 8463374.
Open this publication in new window or tab >>A Glance at the Dagstuhl Manifesto 'QoE Vadis?'
2018 (English)In: 2018 10th International Conference on Quality of Multimedia Experience, QoMEX 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, article id 8463374Conference paper, Published paper (Refereed)
Abstract [en]

This short paper presents the recently published Dagstuhl Manifesto 'QoE Vadis?'. The Manifesto is the result of a set of three Dagstuhl Seminars and one Dagstuhl Perspectives Workshop, aimed at shaping understanding, development and application of the Quality of Experience (QoE) notion and concept. Its task is to convey the current status, promising developments and future projections for different stakeholders. The latter are summarised in a set of eleven recommendations to academia, industry and funding organisations. © 2018 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
Business Aspects, Multimedia, Quality Feedback, Quality Management, Quality of Experience, Recommendations, Socioeconomic Aspects, User Experience
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:bth-17147 (URN)10.1109/QoMEX.2018.8463374 (DOI)2-s2.0-85054407120 (Scopus ID)9781538626054 (ISBN)
Conference
10th International Conference on Quality of Multimedia Experience, QoMEX 2018, 29 May 2018 through 1 June 2018, Sardinia, Italy
Available from: 2018-10-19 Created: 2018-10-19 Last updated: 2018-10-19Bibliographically approved
Kelkkanen, V. & Fiedler, M. (2018). A Test-bed for Studies of Temporal Data Delivery Issues in a TPCAST Wireless Virtual Reality Set-up. In: 2018 28TH INTERNATIONAL TELECOMMUNICATION NETWORKS AND APPLICATIONS CONFERENCE (ITNAC): . Paper presented at 28th International Telecommunication Networks and Applications Conference (ITNAC),Sydney, NOV 21-23 (pp. 404-406). IEEE
Open this publication in new window or tab >>A Test-bed for Studies of Temporal Data Delivery Issues in a TPCAST Wireless Virtual Reality Set-up
2018 (English)In: 2018 28TH INTERNATIONAL TELECOMMUNICATION NETWORKS AND APPLICATIONS CONFERENCE (ITNAC), IEEE , 2018, p. 404-406Conference paper, Published paper (Refereed)
Abstract [en]

Virtual Reality (VR) is becoming increasingly popular, and wireless cable replacements unleash the user of VR Head Mounted Displays (HMD) from the rendering desktop computer. However, the price to pay for additional freedom of movement is a higher sensitivity of the wireless solution to temporal disturbances of both video frame and input traffic delivery, as compared to its wired counterpart. This paper reports on the development of a test-bed to be used for studying temporal delivery issues of both video frames and input traffic in a wireless VR environment, here using TPCAST with a HTC Vive headset. We provide a solution for monitoring and recording of traces of (1) video frame freezes as observed on the wireless VR headset, and (2) input traffic from the headset and hand controls to the rendering computer. So far, the test-bed illustrates the resilience of the underlying WirelesslID technology and TCP connections that carry the input traffic, and will be used in future studies of Quality of Experience (QoE) in wireless desktop VR.

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
Virtual Reality, Quality of Experience, Video Freezes: Wireless, Head-Mounted Display, Monitoring, Recording: Tools
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:bth-17729 (URN)000459862300074 ()978-1-5386-7177-1 (ISBN)
Conference
28th International Telecommunication Networks and Applications Conference (ITNAC),Sydney, NOV 21-23
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21
Kelkkanen, V. & Fiedler, M. (2018). Coefficient of Throughput Variation as Indication of Playback Freezes in Streamed Omnidirectional Videos. In: 2018 28TH INTERNATIONAL TELECOMMUNICATION NETWORKS AND APPLICATIONS CONFERENCE (ITNAC): . Paper presented at 28th International Telecommunication Networks and Applications Conference (ITNAC), Sydney, NOV 21-23 (pp. 392-397). IEEE
Open this publication in new window or tab >>Coefficient of Throughput Variation as Indication of Playback Freezes in Streamed Omnidirectional Videos
2018 (English)In: 2018 28TH INTERNATIONAL TELECOMMUNICATION NETWORKS AND APPLICATIONS CONFERENCE (ITNAC), IEEE , 2018, p. 392-397Conference paper, Published paper (Refereed)
Abstract [en]

A large portion of today's network traffic consists of streamed video of large variety, such as films, television shows, live-streamed games and recently omnidirectional videos. A common way of delivering video is by using Dynamic Adaptive Streaming over HTTP (DASH), or recently with encrypted HTTPS. Encrypted video streams disable the use of Quality of Service (QoS) systems that rely on knowledge of application-dependent data, such as video resolution and bit-rate. This could make it difficult for a party providing bandwidth to efficiently allocate resources and estimate customer satisfaction. An application-independent way of measuring video stream quality could be of interest for such a party. In this paper, we investigate encrypted streaming of omni-directional video via YouTube to a smartphone in a Google Cardboard VR-headset. We monitored such sessions, delivered via both WiFi and mobile networks, at different times of day, implying different levels of congestion, and characterised the network traffic by using the Coefficient of Throughput Variation (CoTV) as statistic. We observe that this statistic shows to be able to indicate whether a stream is stable or unstable, in terms of potential video playback freezes, when the DASH delivery strategy is used.

Place, publisher, year, edition, pages
IEEE, 2018
Keywords
Virtual Reality, 360-videos, video streaming, Quality of Experience, video freezes, throughput statistics
National Category
Communication Systems Telecommunications
Identifiers
urn:nbn:se:bth-17728 (URN)000459862300072 ()978-1-5386-7177-1 (ISBN)
Conference
28th International Telecommunication Networks and Applications Conference (ITNAC), Sydney, NOV 21-23
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21
Eivazzadeh, S., Sanmartin Berglund, J., Larsson, T., Fiedler, M. & Anderberg, P. (2018). Most Influential Qualities in Creating Satisfaction Among the Users of Health Information Systems: A Study in Seven EU Countries. JMIR Medical Informatics, 6(4), 3-21
Open this publication in new window or tab >>Most Influential Qualities in Creating Satisfaction Among the Users of Health Information Systems: A Study in Seven EU Countries
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2018 (English)In: JMIR Medical Informatics, Vol. 6, no 4, p. 3-21Article in journal (Refereed) Published
Abstract [en]

Background:

Several models suggest how the qualities of a product or service influence user satisfaction. Models, such as the Customer Satisfaction Index (CSI), Technology Acceptance Model (TAM), and Delone and McLean Information Systems Success (D&M IS), demonstrate those relations and have been used in the context of health information systems.

Objective:

We want to investigate which qualities foster greater satisfaction among patient and professional users. In addition, we are interested in knowing to what extent improvement in those qualities can explain user satisfaction and if this makes user satisfaction a proxy indicator of those qualities.

Methods:

The Unified eValuation using ONtology (UVON) method was utilised to construct an ontology of the required qualities for seven e-health applications being developed in the FI-STAR project, a European Union (EU) project in e-health. The e-health applications were deployed across seven EU countries. The ontology included and unified the required qualities of those systems together with the aspects suggested by the Model for ASsessment of Telemedicine applications (MAST) evaluation framework. Two similar questionnaires, for 87 patient users and 31 health professional users, were elicited from the ontology. In the questionnaires, user was asked if the system has improved the specified qualities and if the user was satisfied with the system. The results were analysed using Kendall correlation coefficients matrices, incorporating the quality and satisfaction aspects. For the next step, two Partial Least Squares Structural Equation Modelling (PLS-SEM) path models were developed using the quality and satisfaction measure variables and the latent construct variables that were suggested by the UVON method.

Results:

Most of the quality aspects grouped by the UVON method are highly correlated. Strong correlations in each group suggest that the grouped qualities can be measures which reflect a latent quality construct. The PLS-SEM path analysis for the patients reveals that the effectiveness, safety, and efficiency of treatment provided by the system are the most influential qualities in achieving and predicting user satisfaction. For the professional users, effectiveness and affordability are the most influential. The parameters of the PLS-SEM that are calculated allow for the measurement of a user satisfaction index similar to CSI for similar health information systems.

Conclusions:

For both patients and professionals, the effectiveness of systems highly contributes to their satisfaction. Patients care about improvements in safety and efficiency, while professionals care about improvements in the affordability of treatments with health information systems. User satisfaction is reflected more in the users' evaluation of system output and fulfilment of expectations, but slightly less in how far the system is from ideal. Investigating satisfaction scores can be a simple, fast way to infer if the system has improved the abovementioned qualities in treatment and care.

Place, publisher, year, edition, pages
JMIR Publications, 2018
Keywords
Health Information Systems, Telemedicine, Evaluation Studies as Topic, Consumer Behavior, Treatment Outcome, Safety, Efficiency, Health Care Costs, Ontology Engineering, Equation Models
National Category
Other Health Sciences
Identifiers
urn:nbn:se:bth-16998 (URN)10.2196/11252 (DOI)000454162600001 ()
Projects
MD3S
Note

Open access

Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2019-01-10Bibliographically approved
Lagerspetz, E., Flores, H., Mäkitalo, N., Hui, P., Nurmi, P., Tarkoma, S., . . . Quercia, D. (2018). Pervasive Communities in the Internet of People. In: 2018 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2018: . Paper presented at 2018 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2018, 19 March 2018 through 23 March 2018 (pp. 40-45). Institute of Electrical and Electronics Engineers Inc., Article ID 8480273.
Open this publication in new window or tab >>Pervasive Communities in the Internet of People
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2018 (English)In: 2018 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2018, Institute of Electrical and Electronics Engineers Inc. , 2018, p. 40-45, article id 8480273Conference paper, Published paper (Refereed)
Abstract [en]

The Internet has traditionally been a device-oriented architecture where devices with IP addresses are first-class citizens, able to serve and consume content or services, and their owners take part in the interaction only through those devices. The Internet of People (IoP) is a recent paradigm where devices become proxies of their users, and can act on their behalf. To realize IoP, new policies and rules for how devices can take actions are required. The role of context information grows as devices act autonomously based on the environment and existing social relationships between their owners. In addition, the social profiles of device owners determine e.g. how altruistic or resourceconserving they are in collaborative computing scenarios. In this paper we focus on community formation in IoP, a prerequisite for enabling collaborative scenarios, and discuss main challenges and propose potential solutions. © 2018 IEEE.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
Computer programming, Computer science, Context information, IP addresss, Social profiles, Social relationships, Ubiquitous computing
National Category
Communication Systems Media and Communication Technology
Identifiers
urn:nbn:se:bth-17347 (URN)10.1109/PERCOMW.2018.8480273 (DOI)2-s2.0-85056482134 (Scopus ID)9781538632277 (ISBN)
Conference
2018 IEEE International Conference on Pervasive Computing and Communications Workshops, PerCom Workshops 2018, 19 March 2018 through 23 March 2018
Available from: 2018-11-29 Created: 2018-11-29 Last updated: 2018-11-29Bibliographically approved
Fotrousi, F., Fricker, S. & Fiedler, M. (2018). The effect of requests for user feedback on Quality of Experience. Software quality journal, 26(2), 385-415
Open this publication in new window or tab >>The effect of requests for user feedback on Quality of Experience
2018 (English)In: Software quality journal, ISSN 0963-9314, E-ISSN 1573-1367, Vol. 26, no 2, p. 385-415Article in journal (Refereed) Published
Abstract [en]

Companies are interested in knowing how users experience and perceive their products. Quality of Experience (QoE) is a measurement that is used to assess the degree of delight or annoyance in experiencing a software product. To assess QoE, we have used a feedback tool integrated into a software product to ask users about their QoE ratings and to obtain information about their rationales for good or bad QoEs. It is known that requests for feedback may disturb users; however, little is known about the subjective reasoning behind this disturbance or about whether this disturbance negatively affects the QoE of the software product for which the feedback is sought. In this paper, we present a mixed qualitative-quantitative study with 35 subjects that explore the relationship between feedback requests and QoE. The subjects experienced a requirement-modeling mobile product, which was integrated with a feedback tool. During and at the end of the experience, we collected the users' perceptions of the product and the feedback requests. Based on the users' rational for being disturbed by the feedback requests, such as "early feedback," "interruptive requests," "frequent requests," and "apparently inappropriate content," we modeled feedback requests. The model defines feedback requests using a set of five-tuple variables: "task," "timing" of the task for issuing the feedback requests, user's "expertise-phase" with the product, the "frequency" of feedback requests about the task, and the "content" of the feedback request. Configuration of these parameters might drive the participants' perceived disturbances. We also found that the disturbances generated by triggering user feedback requests have negligible impacts on the QoE of software products. These results imply that software product vendors may trust users' feedback even when the feedback requests disturb the users.

Place, publisher, year, edition, pages
SPRINGER, 2018
Keywords
Quality of experience, QoE, User feedback, User perception, Human factors
National Category
Software Engineering
Identifiers
urn:nbn:se:bth-16526 (URN)10.1007/s11219-017-9373-7 (DOI)000433521200007 ()
Available from: 2018-06-18 Created: 2018-06-18 Last updated: 2018-06-18Bibliographically approved
Popescu, A., Yao, Y., Fiedler, M. & Ducloux, X. (2018). Video Distribution Networks: Models and Performance. In: Adrian Popescu (Ed.), Greening Video Distribution Networks: Energy-Efficient Internet Video Delivery (pp. 227). Springer
Open this publication in new window or tab >>Video Distribution Networks: Models and Performance
2018 (English)In: Greening Video Distribution Networks: Energy-Efficient Internet Video Delivery / [ed] Adrian Popescu, Springer, 2018, p. 227-Chapter in book (Refereed)
Abstract [en]

The creation, distribution and delivery of video content is a sophisticated process with elements like video acquisition, preprocessing and encoding, content production and packaging as well as distribution to customers. IP networks are usually used for the transfer of video signals. The treatment of video content is also very complex, and we have a multidimensional process with elements like content acquisition, content exchange and content distribution. The focus of the chapter is on the presentation of models that can be used to characterize the main elements in a video distribution chain. These models are about video coding and compression, video streaming, video traffic models, energy consumption models, system performance, concepts of performance optimization and QoE- and energy-optimal streaming.

Place, publisher, year, edition, pages
Springer, 2018
Series
Computer Communications and Networks, ISSN 1617-7975
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-17224 (URN)10.1007/978-3-319-71718-0_3 (DOI)978-3-319-71718-0 (ISBN)
Available from: 2018-11-05 Created: 2018-11-05 Last updated: 2018-11-07Bibliographically approved
Yao, Y., Popescu, A., Fiedler, M. & Ljung, R. (2017). On the Performance of Video Streaming in Energy-Aware Wireless Mesh Networks. In: European Conference on Networks and Communications (EuCNC) 2017: . Paper presented at European Conference on Networks and Communications (EuCNC), Oulu, Finland. IEEE
Open this publication in new window or tab >>On the Performance of Video Streaming in Energy-Aware Wireless Mesh Networks
2017 (English)In: European Conference on Networks and Communications (EuCNC) 2017, IEEE, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Mobile multimedia has today become a promising application for end users and service providers. With reference to the existing systems for mobile communications, this application further demands for solving several technical problems, especially regarding video streaming over wireless networks. An interesting approach is in form ofWireless Mesh Network (WMN) based networks, where the individual video flows operate in an end-to-end (e2e) manner along a particular networking scenario including several mesh routers. That means, a particular mesh router may be traversed by multiple video flows. This situation may become even more complicated in the case of a large amount of packet retransmissions, which may deteriorate the performance of video flows. To investigate this problem, a two-level Modulated Markov Poisson Process (MMPP) based queueing model is built up and the transport performance of e2e video streaming in WMN based mobile multimedia system is analysed. Four metrics are used to study the system performance, namely e2e throughput, e2e delay, e2e error-rate and traffic-related energy consumption. Numerical analysis and evaluation studies are done. Based on the reported results, two different solutions are suggested and discussed with regard to the trade-off among these metrics.

Place, publisher, year, edition, pages
IEEE, 2017
Series
European Conference on Networks and Communications, ISSN 2475-6490, E-ISSN 2575-4912
Keywords
Streaming media, Energy consumption, Power demand, Routing, Mobile communication, Measurement, Mobile handsets
National Category
Telecommunications
Identifiers
urn:nbn:se:bth-15640 (URN)10.1109/EuCNC.2017.7980771 (DOI)000425922900130 ()978-1-5386-3873-6 (ISBN)
Conference
European Conference on Networks and Communications (EuCNC), Oulu, Finland
Projects
CONVINcE
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2018-05-23Bibliographically approved
Nawaz, O., Minhas, T. N. & Fiedler, M. (2017). QoE based comparison of H.264/AVC and WebM/VP8 in an error-prone wireless network. In: Chemouil P.,Simoes P.,Madeira E.,Secci S.,Monteiro E.,Gaspary L.P.,dos Santos C.R.P.,Charalambides M. (Ed.), Proceedings of the IM 2017 - 2017 IFIP/IEEE International Symposium on Integrated Network and Service Management: . Paper presented at 15th IFIP/IEEE International Symposium on Integrated Network and Service Management, IM 2017, Lisbon (pp. 1005-1010). Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>QoE based comparison of H.264/AVC and WebM/VP8 in an error-prone wireless network
2017 (English)In: Proceedings of the IM 2017 - 2017 IFIP/IEEE International Symposium on Integrated Network and Service Management / [ed] Chemouil P.,Simoes P.,Madeira E.,Secci S.,Monteiro E.,Gaspary L.P.,dos Santos C.R.P.,Charalambides M., Institute of Electrical and Electronics Engineers (IEEE), 2017, p. 1005-1010Conference paper, Published paper (Refereed)
Abstract [en]

Quality of Experience (QoE) management is a prime topic of research community nowadays as video streaming, online gaming and security applications are completely reliant on the network service quality. Moreover, there are no standard models to map Quality of Service (QoS) into QoE. HTTP media streaming is primarily used for such applications due to its coherence with the Internet and simplified management. The most common video codecs used for video streaming are H.264/AVC and Google's VP8. In this paper, we have analyzed the performance of these two codecs from the perspective of QoE. The most common end-user medium for accessing video content is via home based wireless networks. We have emulated an error-prone wireless network with different scenarios involving packet loss, packet delay and delay variation. The focus of this paper is evaluating the end user satisfaction with the multimedia content by subjective assessment using Mean Opinion Score (MOS). We have observed the overall superiority of H.264/AVC but the VP8 codec strongly gains ground in highly error-prone networks in terms of user satisfaction. © 2017 IFIP.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2017
Keywords
H.264/AVC, Multimedia communication, QoE management, Quality of Experience, WebM(VP8), Errors, HTTP, Human computer interaction, Media streaming, Motion Picture Experts Group standards, Multimedia systems, Packet networks, Video signal processing, Video streaming, Wireless networks, Multi-media communications, Qoe managements, Quality of experience (QoE), Quality of service
National Category
Communication Systems
Identifiers
urn:nbn:se:bth-15217 (URN)10.23919/INM.2017.7987426 (DOI)2-s2.0-85029430735 (Scopus ID)9783901882890 (ISBN)
Conference
15th IFIP/IEEE International Symposium on Integrated Network and Service Management, IM 2017, Lisbon
Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2017-09-29Bibliographically approved
Fiedler, M., De Moor, K., Ravuri, H., Tanneedi, P. & Chandiri, M. (2017). Users On The Move: On Relationships Between QoE Ratings, Data Volumes and Intentions to Churn. In: Proc. 2017 IEEE 42nd Conference on Local Computer Networks Workshops (LCN Workshops): Workshop On User MObility and VEhicular Networks (ON-MOVE). Paper presented at IEEE 42nd Conference on Local Computer Networks Workshops (LCN Workshops), Singapore (pp. 97-102). IEEE
Open this publication in new window or tab >>Users On The Move: On Relationships Between QoE Ratings, Data Volumes and Intentions to Churn
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2017 (English)In: Proc. 2017 IEEE 42nd Conference on Local Computer Networks Workshops (LCN Workshops): Workshop On User MObility and VEhicular Networks (ON-MOVE), IEEE, 2017, p. 97-102Conference paper, Published paper (Refereed)
Abstract [en]

For a long time, the risk of customer churn, i.e. to leave an operator, has been used as argument in favor of Quality of Experience (QoE) research. However, the understanding of how churn behavior and QoE are related is still limited. This is problematic, as customer retention and churn prediction have grown in importance in face of ever-growing competition on the telecom market. The work presented in this paper aims to make a contribution in this respect, by exploring the relationships between QoE ratings, data volumes and churn risk through a longitudinal user study. Using an Experience Sampling Method-inspired approach we have been collecting weekly feedback on experienced quality, annoyance and intentions to churn from 22 users for up to eight weeks. Additionally, measurements of weekly used data volumes were collected. We observed churning behavior for 3 out of 22 participants and analyze the rating and data usage profiles of churners against non-churners. Furthermore, we investigate correlations of ratings and volumes, and find that “annoyed churners surf less”. Our findings point out warning signals for potential user churn as well as promising directions for future studies.

Place, publisher, year, edition, pages
IEEE, 2017
Keywords
Quality of Experience, user ratings, customer churn, data volumes
National Category
Communication Systems
Identifiers
urn:nbn:se:bth-15621 (URN)10.1109/LCN.Workshops.2017.70 (DOI)000418465100013 ()978-1-5090-6583-7 (ISBN)
Conference
IEEE 42nd Conference on Local Computer Networks Workshops (LCN Workshops), Singapore
Projects
BigData@BTH
Funder
Knowledge Foundation, 2014-0032
Available from: 2017-12-13 Created: 2017-12-13 Last updated: 2018-02-02Bibliographically approved
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