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Enabling mMTC and URLLC in 5G: Initial Access, Traffic Prediction, and User Availability

Thilina Nuwan Weerasinghe of the Faculty of Engineering and Science at the University of Agder has submitted his thesis entitled «Enabling mMTC and URLLC in 5G: Initial Access, Traffic Prediction, and User Availability» and will defend the thesis for the PhD-degree Tuesday 25 May 2021. (Photo: Private)

A major contribution of this dissertation lies in initial access scheme design considering both URLLC and mMTC traffic.

Thilina Nuwan Weerasinghe

PhD Candidate

The disputation will be held digitally, because of the Corona covid-19-situation. Spectators may follow the disputation digitally – link is available below.

 

Thilina Nuwan Weerasinghe of the Faculty of Engineering and Science at the University of Agder has submitted his thesis entitled «Enabling mMTC and URLLC in 5G: Initial Access, Traffic Prediction, and User Availability» and will defend the thesis for the PhD-degree Tuesday 25 May 2021. 

He has followed the PhD-programme at the Faculty of Engineering and Science, with spesialisation in ICT.

Summary of the thesis by Thilina Nuwan Weerasinghe:

Enabling mMTC and URLLC in 5G: Initial Access, Traffic Prediction, and User Availability

The 5th generation (5G) mobile communication networks focus on three main technological pillars as enhanced mobile broadband (eMBB), ultra-reliable and low latency communications (URLLC), and massive machine type communications (mMTC).

While eMBB is already in the deployment phase, how to provide URLLC and mMTC still needs further investigation, especially when the stringent requirements for both URLLC and mMTC are considered.

Therefore, topics relevant to URLLC and mMTC have attained a surge of research interests from both industry and academia.

Initial Access Approaches in URLLC and mMTC Scenarios

A major contribution of this dissertation lies in initial access scheme design considering both URLLC and mMTC traffic.

Three initial access schemes are proposed for scenarios that involve a massive number of devices with and without URLLC requirements. A dynamic resource allocation scheme for heterogeneous traffic which takes the advantage of the 5G new radio frame structure is proposed.

Both grant-based and grant-free access schemes are investigated in this thesis work.

Traffic Prediction

The dissertation also investigates traffic prediction at a 5G base station when a massive number of devices generate traffic abruptly during a short period of time.

Such a situation could cause high collisions at the base station resulting in loss of packets and longer delays.

With precise traffic prediction, radio resources can be allocated proactively to mitigate such shortcomings.

User Availability

In addition, an analysis of service availability for a mobile user in 5G networks to achieve anytime and anywhere communication is performed and three strategies to improve per-user availability are explored.

All the above proposed schemes are evaluated and compared with reference schemes through in-depth mathematical analysis and extensive discrete-event simulations.

Disputation facts:

The trial lecture and the public defence will take place online, via the Zoom conferencing app (link below)

Head of the Department of ICT, Folke Haugland, Faculty of Engineering and Science, University of Agder, will chair the disputation.

The trial lecture at 10:15 hours

Public defence at 12:15 hours

Given topic for trial lecture«Coexistence Mechanisms between eMBB and URLLC in 5G Wireless Networks»

Thesis Title«Enabling mMTC and URLLC in 5G: Initial Access, Traffic Prediction, and User Availability»

Search for the thesis in AURA - Agder University Research Archive, a digital archive of scientific papers, theses and dissertations from the academic staff and students at the University of Agder.

The thesis is available here:

https://hdl.handle.net/11250/2755618

 

The CandidateThilina Nuwan Weerasinghe (1985, Galle, Sri Lanka) BSc Engineering- Faculty of Engineering, University of Ruhuna (2009), MSc in Information and Communication Technology, University of Agder (2015) Master thesis: Adaptive Backbone and Link Correlation based Data Transmission Schemes for Wireless Sensor Networks. He has worked as an Engineer in Radio Network Optimization in various telecommunication related projects in Sri Lanka and Maldives. Present position: Lecturer at Department of Electrical and Information Engineering, University of Ruhuna.

The doctoral work has been funded by Center for Research-Based Innovation (SFI) Offshore Mechatronics at UiA, and the Department of ICT at UiA.

Opponents:

First opponent: Professor Oriol Sallent, Technical University of Catalonia, Spain

Second opponent: Associate Professor Katina Kralevska, NTNU - Norwegian University of Science and Technology

Associate Professor Martin Gerdes, Department of ICT, University of Agder, is appointed as the administrator for the assessment commitee.

Supervisors were Professor Frank Yong Li, UiA (main supervisor) and Senior Lecturer Indika Anuradha Mendis Balapuwaduge, UiA (now Anuradha Mendis at the University of Ruhuna, Sri Lanka)  (co-supervisor)

What to do as an audience member:

The disputation is open to the public, but to follow the trial lecture and the public defence, which is transmitted via the Zoom conferencing app, you have to register as an audience member.

We ask audience members to join the virtual trial lecture at 10:05 at the earliest and the public defense at 12:05 at the earliest. After these times, you can leave and rejoin the meeting at any time. Further, we ask audience members to turn off their microphone and camera and keep them turned off throughout the event. You do this at the bottom left of the image when in Zoom. We recommend you use ‘Speaker view’. You select that at the top right corner of the video window when in Zoom.

Opponent ex auditorio:

The chair invites members of the public to pose questions ex auditorio in the introduction to the public defense, with deadlines. It is a prerequisite that the opponent has read the thesis. Questions can be submitted to the chair Folke Haugland by e-mail folke.haugland@uia.no