Karl-Johan Grinnemo

My research primarily considers the quality of service in IP-based computer and telecommunication networks. To address the needs of current and future cellular networks to support services that demand strict requirements such as low latency, high throughput, and high availability, I have been involved in research on multi-connectivity solutions and solutions that exploit so-called network slicing that was introduced in 5G, and which is one of the main pillars in the architecture of 5G-and-beyond networks.

With the advent of 5G, there has been a surge of interest in the Internet of Things (IoT) in general and Cellular IoT (CIoT) in particular. As a result of this interest, research on power-saving mechanisms and configurations and finding a tradeoff between limited resources and battery lifetime of CIoT devices and resource-intensive applications have become important research questions. I have been part of research that has developed a simulator in OMNeT++ to study the power consumption of Narrow-Band IoT (NB-IoT) devices, i.e., one type of CIoT device. As a first step, my research colleagues and I have, with the help of this simulator, provided guidelines on how to power efficiently configure these devices. Our research group has also proposed heuristics for efficiently allocating tasks between cellular devices, including CIoT devices, the mobile edge, and the cloud.

I am actively participating in teaching at both the first-, second-, and third-cycle levels. Since 2010, I work at Karlstad University, however, during 2009-2010, I was an acting lecturer at the KTH Royal Institute of Technology.

Karlstad University

• Lecturer in graduate course Advanced "Communication Networks" (DVAD20), Fall 2022.

• Course responsible for graduate course "Introduction to Machine Learning" (DVAD91), Fall 2021.

• Responsible for resit exam in undergraduate course "Databases" (DVGA21), Spring 2021.

• Responsible for resit exam in undergraduate course "Database Techniques" (DVGB04), Spring 2021.

• Course responsible for undergraduate course "Computer Networking I" (DVGB02), Spring 2021, Spring 2022.

• Course responsible for undergraduate course "Operating Systems" (DVGB01), Fall 2020, Fall 2021, Fall 2022.

• Thesis advisor and examiner in undergraduate course "Degree Project for Master of Science in Engineering, Computer Engineering" (DVAE11), Fall 2018, Spring 2018, Spring 2019, Spring 2020, Spring 2021, Spring 2022.

• Assistant teacher in Ph.D. course "Individual Theme", Spring 2019.

• Lecturer in graduate course "Future Internet Design and Service Quality" (DVAD60, DVAD61, DVAD62, DVAD63, DVAD64), Spring 2019, Spring 2020, Spring 2021, Spring 2022, Fall 2020, Fall 2021, Fall 2022.

• Lecturer in undergraduate course "Computer Networking I" (DVGB02), Spring 2019.

• Lecturer in undergraduate course "Computer Engineering Project" (DVAE08), Fall 2018, Fall 2020.

• Lecturer in undergraduate course "Operating Systems" (DVGB01), Fall 2018, Fall 2019.

• Lecturer in undergraduate course "Programming Techniques" (DVGA01), Fall 2017, Fall 2022.

• Course Responsible for undergraduate course "Programming Techniques" (DVGA01), Fall 2021.

• Course Responsible for Ph.D. course "Computer Networking Seminar", Fall 2017.

• Course responsible for undergraduate course "Computer Engineering Project" (DVAE08), Fall 2015.

• Assistant in Ph.D. course "Individual Themes", Spring 2014, Fall 2015.

• Assistant in Ph.D. course "Classic Papers", Fall 2013.

• Lab assistant in undergraduate course "Programming Techniques for Engineers" (DVGA15), Fall 2013.

• Lab assistant in undergraduate course "Software Development and Design" (DVGA09), Spring 2013.

• Lab assistant in undergraduate course "Operating Systems" (DVGB01), Fall 2012 and Fall 2013.

• Lecturer in graduate course "Perspectives in Computer Science" (DVAD07), Fall 2011, Fall 2012, Fall 2013, Fall 2014, Fall 2015.

• Thesis advisor and examiner in undergraduate course "Bachelor's Project" (DVGC25), Fall 2011, Fall 2012, Fall 2013, Fall and Spring between 2017 and 2022.

• Lecturer in Ph.D. course "Current Advances in Computer Networking", Spring 2011.

• Course responsible for undergraduate course "Distributed Systems and Applications" (DVGC15), Fall 2010, Fall 2011, Fall 2012, Fall 2013, Fall 2014, Fall 2015, Fall 2016, Fall 2017, Fall 2019.

KTH Royal Institute of Technology

• Project assistant in graduate course "Communication System Design" (IK2200), Spring 2010.
• Course responsible for the undergraduate course "Networks and Communication" (IK1203), Spring 2010.
• Lecturer and lab assistant in graduate course "Advanced Internetworking" (IK2215), Fall 2009 and Fall 2010.
• Lecturer and lab assistant in graduate course "Internet Security and Privacy" (IK1206), Fall 2009.

Cooperates with several Swedish universities and research institutes, including MDU, KTH, and RISE, in nationally funded projects, as well as several European universities and institutes in EU funded projects, including University of Oslo, Simula, University of Malaga, University of Athens, Fraunhofer FOKUS, and FH Munster.

I completed my Ph.D. studies in June 2006 and worked half a year as a post-doctor at the former Department of Computer Science at Karlstad University. During that time, I continued my research from my Ph.D. studies on telephone signaling over IP and SCTP with Ericsson Research in Aachen. I also participated in a cooperative research effort on using SCTP in mobile networks with Universitat Politècnica de Catalunya (UPC) in Barcelona. In January 2007, my post-doctoral position at Karlstad University ended, and I resumed my position as a consultant at Tieto in Karlstad. My work at Tieto was aligned with my research and covered a broad range of activities, including pre-studies, system design, and implementation. For example, I implemented an alarm function in Ericsson’s Connectivity Packet Platform (CPP). I conducted a pre-study with colleagues from Tieto’s Beijing office on how to build an SCTP traffic offload engine for SCTP in CPP.
Moreover, I continued to have a foot in research. I took part in more or less all research project phases, including planning, grant seeking, and execution. As an adjunct researcher, I actively participated in an ongoing research effort between Tieto and Karlstad University.
Between the Fall of 2009 and the Fall of 2010, I was on leave from Tieto in Karlstad. I worked as an acting associate professor at the School of Information and Communication Technology at the KTH Royal Institute of Technology. As an associate professor, I initiated a research project, ”Smart Session Management for Multi-homed SCTP” (SCTP Smartswitch), together with Karlstad University and Ericsson Research in Kista. The “SCTP Smartswitch” project aimed at extending the failover/changeover mechanism of SCTP with intelligent session management so that it would be able to manage everything from real-time applications, such as interactive games, which require fast failovers/changeovers, to roaming mobile terminals which sometimes experience long disconnection periods, i.e., long failover/changeover periods. In the Fall of 2010, I acquired a four-year tenure-track position at Karlstad University. During my first two years as a senior associate lecturer in their computer science department, the ”SCTP SmartSwitch” project was a major part of my research work. Notably, it resulted in about ten publications, an SCTP-based mobility management framework for smartphones and tablets that offered sub-second vertical handover between 3G and WiFi networks, and a generic SCTP-based session layer for mobility support in mobile delay-tolerant networks.
I became a Senior Lecturer at Karlstad University in the Fall of 2014 and an Associate Professor (Swedish Docent) in the Fall of 2016. I have authored and co-authored more than 80 conference and journal papers and am a Senior Member of IEEE.