Simone Ferlin-Oliveira successfully defended her PhD

On Friday June 23rd, Simone Ferlin-Oliveria defended her PhD thesis "Making Multipath TCP Work over Heterogeneous Wireless Networks". The defense took place at 13.15 at Storstua, Simula.

Multipath TCP (MPTCP) is the major standardised extension of the Transmission Control Protocol (TCP).  MPTCP enables a regular TCP connection to use multiple networks simultaneously, increasing both application's throughput and reliability. Although multipath transport promises are great, they come with challenges when the underlying networks are heterogeneous in terms of capacity, delay and loss. In this thesis, we focus on MPTCP's performance in such heterogeneous scenarios, and how heterogeneity impacts MPTCP's operational goals.

Our main findings can be summarised as:

  • We implement and evaluate a shared bottleneck detection with MPTCP's couple congestion control, which makes possible the separation of fairness aspects in MPTCP, unlocking its full potential when bottlenecks are not shared.
  • We propose and implement a scheduling algorithm, which is able to improve performance, in terms of latency and throughput, in heterogeneous scenarios and reduce the amount of spurious retransmissions compared to default MPTCP.
  • We propose a lightweight XOR Forward Error Correction (FEC) to aid MPTCP with subflows with heterogeneity in terms of loss, reducing loss detection and recovery time to 0-RTT.

The thesis is written within the field of Communication Systems. The work has been conducted at Simula Research Laboratory.

Prior to the defense, at 10:15, Simone Ferlin-Oliveria presented her trial lecture "Autonomic Driving: Technical and Non-technical Challenges".

The adjudication committee

  • Professor Adam Wolisz, Technische Universität Berlin,
  • Professor Xiaoming Fu,  Institute of Computer Science, Faculty of Mathematics and Computer Science, Georg-August-University of Goettingen, Germany   
  • Associate Professor Tao Yue, Department of Informatics, University of Oslo

Chair of the disputation

  • Head of Department Ellen Munthe-Kaas, University of Oslo, Institute of Informatics


  • Senior Research Scientist Özgü Alay, Simula Research Laboratory
  • Professor Michael Welzl, Department of informatics, University of Oslo
  • Professor Olav Lysne, Simula Research Laboratory

Read more

Announcement of the PhD defense at the University of Oslo's web pages.

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