Eirik Larsen Følstad

Position: PhD Student
Office: E-252
Email: eirik.folstad@q2s.ntnu.no
Phone: +47 73 55 02 65
Mobile: +47 920 44 740

Publications: Cristin (Norwegian universities' research publication index).

Short Bio

  • 2008- PhD student at the Norwegian Centre of Excellence (CoE) for Quantifiable Quality of Service in Communication Systems (Q2S) at the Norwegian University of Science and Technology.
  • 1998-2008 TeliaSonera Norway. Various positions in Network Development for cellular system. Last five years as department manager for network functionality, structure and capacity.
  • 1994-1998 Ericsson. SW development for network management systems for mobile and fixed switches.
  • 1994 Master's Degree (Siv.ing.) from Division of Computer Systems and Telematics, NTH (now NTNU).


Thesis title: Managed access dependability for critical services in wireless inter domain environment

My supervisor is Professor Bjarne E. Helvik.

On going research given in standardization through technical specifications, forums and papers strongly give the impression that forthcoming 4G networks will consist of diverse set of wireless networks integrated into IP-based networks. Mobility and seamless handover between the networks is one of the key features. Critical services further strengthen the need for continuously availability of the service through one or more access link during the session time of the service (or set of services).

The objective is that mobile user should be able to have a guarantee of the availability and continuity (of a specified set of services) and be warned if the requirements is not met or likely to be violated if she/he proceeds. The main challenge of such a scenario in a multi operator and multi access technology environment is to predict the availability the service that use wireless links by combining the possible access technologies with seamless vertical or horizontal handover for the service continuity.

Research goals

  1. Propose an information model of physical and logical resources for wireless/cellular access up to the core infrastructure that unveils the cooperation and sharing/dependencies of resources between operators. Methods for ensuring that the model is updated and reflecting the actual network condition shall be included.
  2. Propose mechanisms for dependability analysis based upon the information model obtained. This shall include dynamic calculation of availability and continuity for the during the session time of the service (or set of services) meeting the mobile user requirements (as well as cost) by performing vertical and/or horizontal handovers. An efficient network discovery scheme for wireless/cellular environment is needed to ensure an always best connected scenario.
  3. Propose an architecture/model of efficient handover procedure(s) between access technologies based on the prediction model/scheme. Important aspects are the handover detection/criteria, decision, initiation and execution and whether this shall be network and/or terminal controlled procedures. A comparison between a multi homed and a single homed scenario shall be conducted.


MOBILITY 2011Reviewer


The following courses are part of my PhD education;
TM8109Advance Network Topics in ad hoc NetworksAutumn 2009
TM8105Advanced Dicrete Event Simulation MethodologyAutumn 2009
---Seamless RoamingSpring 2009
TM8102Traffic Analysis of Communication NetworksSpring 2009
TM8101Dependability Analysis of Information and Communication SystemsAutumn 2008


I was a teaching assistant in the following courses;
TTM4165ICT, Organization and MarketAutumn 2013
TTM4165ICT, Organization and MarketAutumn 2012
TTM4165ICT, Organization and MarketAutumn 2011
TTM4165ICT, Organization and MarketSpring 2011