The PhD defence will be partially digital, in Kristen Nygaards sal (5370), Ole-Johan Dahls hus and streamed directly using Zoom. The host of the session will moderate the technicalities while the chair of the defence will moderate the disputation.
Ex auditorio questions: the chair of the defence will invite the attending audience at Kristen Nygaards sal to ask ex auditorio questions.
Trial lecture
- Thursday 7 April 2022, 11:15, in Kristen Nygaards sal (5370), Ole-Johan Dahls hus / Zoom
- Join the trial lecture
- Title: “Congestion control in packet networks”
Main research findings
Empirical Analysis of QoS and QoE in Mobile Broadband Networks
or alternatively
Why is my Internet so slow? And why does my video keep buffering?
Mobile broadband (MBB) networks are a key component of modern communication infrastructures and they underpin vital operations in society. As MBB network performance has significant consequences for a large number of stakeholders, measurements are necessary for continuous evaluation and benchmarking.
In this thesis, we present an empirical study of MBB network performance from two aspects: Quality of Service (QoS) as experienced by the end-users of speedtests, and Quality of Experience (QoE) as experienced by the end-users of adaptive video streaming applications. Our goal is to identify the influencing factors on selected QoS and QoE metrics.
Our study of operational networks (``measurements in the wild'') shows that there are clear differences in network performance depending on underlying application, transport, network, and physical layer parameters, as well as spatio-temporal factors and measurement configurations. We find that MBB networks vary in terms of their performance stability over time, and their ability to support popular applications such as video streaming. We identify the most prominent influencing factors for selected QoS and QoE metrics, and quantify their effects where possible. We provide the research community with multiple open-source frameworks for continued empirical analysis of MBB networks, along with open datasets from various measurement studies.
Adjudication committee:
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Professor Saverio Mascolo, Dipartimento di Ingegneria Elettrica e dell'Informazione (DEI), Politecnico di Bari, Italy
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Associate Professor Laura Toni, Institute of Communications and Connected Systems, University College London, United Kingdom
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Professor Tor Skeie, University of Oslo, Department of informatics Norway
Supervisors
- Senior Research Scientist Özgü Alay, Department of Informatics / Simula Research Laboratory
- Professor Carsten Griwodz, Department of Informatics, UiO
Chair of defence
- Associate Professor Petter Nielsen, University of Oslo, Department of informatics Norway
Candidate contact information: https://research.cise.ninja
Contact information to Department: Pernille Adine Nordby