PhD defence by Krzysztof Mateusz Malarski

Title: Reliable Architecture for Future Smart Communities


Principal supervisor: Associate Professor Sarah Ruepp, Department of Fotonics, DTU, Denmark
Co-supervisor: Associate Professor Martin Nordal Petersen, Department of Fotonics, DTU, Denmark
Co-supervisor: Associate Professor Michael Stübert Berger, Department of Fotonics, DTU, Denmark

Evaluation Board
Associate Professor Lars Staalhagen, Department of Fotonics, DTU, Denmark
Professor Eik Larsson, Lund University, Sweden
Senior Staff Software Engineer Jakob Buron, Silicon Labs, Denmark

Master of the Ceremony
Associate Professor Henrik Wessing, Department of Fotonics, DTU, Denmark

Smart Communities of the future are the ecosystems where critical use-cases (e.g. environmental monitoring, remote water/gas metering, asset tracking, tele-medicine) are powered by Internet of Things (IoT) networks. The communication infrastructure of Smart Communities must ensure robust coverage, high reliability and strong security for all the considered scenarios. This thesis focuses on the most prominent Low-Power Wide-Area Network (LP-WAN) technologies: NB-IoT, LTE-M, LoRaWAN and Sigfox and addresses the aforementioned features in the following way:

  1. Coverage of the LP-WANs is experimentally evaluated in outdoor maritime scenario and in the underground tunnels, where the connectivity is challenged by extreme signal attenuation. It is proven that the considered standards can provide solid coverage outdoor. Based on our publicly available deep-indoor measurements we could observe that the current statistical models for path-loss prediction are not accurate in the underground scenario; instead, we derive a novel prediction model utilising basic environmental parameters and outperforming the currently available model.
  2. Reliability of cellular IoT (i.e. NB-IoT and LTE-M) is addressed in a scenario of base station failure. A proposed Device-to-Device (D2D) failure-recovery scheme can enable the communications even when no base station in the neighbourhood is reachable.
  3. Security in LP-WANs is investigated via the implemented vulnerability exploits, which were successful for LoRaWAN, Sigfox and NB-IoT. A novel application layer security scheme, Group OSCORE is implemented and published in an open-source repository, and performance evaluated on 2 types of constrained devices.


tir 18 maj 21
13:30 - 16:30


DTU Fotonik



Online via Zoom.

Meeting ID: 625 9602 7231
Passcode: 017744