Janne Riihijärvi
Senior Research Scientist

Tel:  +49 241 80 20921
Fax: +49 241 80 620900

Email: jar-at-inets.rwth-aachen.de


Brief Biography

My current research focuses on applications of modern statistical tools for performance evaluation and optimization of next-generation wireless networks. I am especially interested in the radio environment mapping problem, or how to turn extremely noisy measurements collected by mobile terminals into reliable estimates of network coverage. Other lines of work include future network architectures, software defined networking, and applications of “big data” tools to processing of massive sensing data in the context of the Internet of Things. In the past I have worked on frequency allocation mechanisms for large-scale Wi-Fi networks, spectrum use modeling and measurements, wireless sensor networks, localization and tracking problems, and characterization of packet network traffic using methods from nonlinear dynamical systems research. Below is a selection of my main publications on these topics.


Spatial Statistics for Wireless Networks

J. Riihijärvi and P. Mähönen
"A Spatial Statistics Approach to Characterizing and

Modeling the Structure of Cognitive Wireless Networks
Elsevier Ad Hoc Networks, vol. 10, no. 5, pp. 858-869, July 2012.

J. Riihijärvi, J. Nasreddine, P. Mähönen
"Influence of Spatial Statistics of Spectrum Use on the
Performance of Cognitive Wireless Networks
Proc. of ACM MSWiM, Paphos, Cyprus, October 2012. (Best paper award)

M. Wellens, J. Riihijärvi and P. Mähönen
Spatial Statistics and Models of Spectrum Use"
Elsevier Computer Communications, vol. 32, no. 18, pp. 1998-2011, December 2009.

J. Riihijärvi, P. Mähönen and M. Rübsamen
Characterizing Wireless Networks by Spatial Correlations"
IEEE Communications Letters, vol. 11, No. 1, pp. 37-39, January 2007.

Radio Environment Maps

L. Gavrilovska, J. van de Beek, Y. Xie, E. Lidström,
J. Riihijärvi, P. Mähönen, V. Atanasovski, D. Denkovski, V. Rakovic
"Enabling LTE in TVWS with radio environment maps:
From an architecture design towards a system level prototype
Elsevier Computer Communications, Vol. 53, pp. 62–72, November 2014

A. Galindo-Serrano, B. Sayrac, S. Ben Jemaa, J. Riihijärvi, P. Mähönen
"Cellular Coverage Optimization:
A Radio Environment Map for Minimization of Drive Tests
in Cognitive Communication and Cooperative HetNet Coexistence,
M.-G. Di Benedetto, F. Bader (eds.), pp. 211-236, Springer, 2014

A. Achtzehn, J. Riihijärvi, P. Mähönen
Improving Accuracy for TVWS Geolocation Databases:
Results from Measurement-Driven Estimation Approaches
Proc. of IEEE DySPAN 2014, McLean, Virginia, April 2014

E. Meshkova, J. Riihijärvi, J. Ansari, P. Mähönen
"Indoor Coverage Estimation from
Unreliable Measurements using Spatial Statistics
Proc. of ACM MSWiM 2013, Barcelona, Spain, November 2013

J. van de Beek, T. Cai, S. Grimoud,
 P. Mähönen, J. Nasreddine, J. Riihijärvi, B. Sayrac
"How a layered REM architecture brings cognition to 
today's mobile networks"
IEEE Wireless Communications Mag., vol. 19, no. 4, pp. 17-24, August 2012.

Spectrum Usage

J. van de Beek, J. Riihijärvi, A. Achtzehn, and P. Mähönen
"TV White Space in Europe"

IEEE Transactions on Mobile Computing, vol. 11, no. 2, pp. 178-188, February 2012.

M. Wellens, J. Riihijärvi and P. Mähönen
Empirical Time and Frequency Domain Models of Spectrum Use"
Elsevier Physical Communication Journal, Special Issue on Cognitive Radio:
 Algorithms & System Design, vol. 2, no. 1-2, pp. 10-32, March-June 2009.

Network Traffic Characterization

J. Riihijärvi, M. Wellens and P. Mähönen
Measuring Complexity and Predictability in
 Networks with Multiscale Entropy Analysis"
Proc. of IEEE INFOCOM 2009, Rio de Janeiro, Brazil, April 2009.

O. Raivio, J. Riihijärvi and P.Mähönen
"Classifying and Clustering the Internet Traffic by Kohonen Network"
Proceeding of the ICSC Symposia on Neural Computation (NC'2000)
, May 2000, Berlin, Germany.

Big Data for Wireless Networks

C. Jardak, P. Mähönen, J. Riihijärvi
"Spatial Big Data and Wireless Networks:
Experiences, Applications, and Research Challenges
IEEE Network Magazine, 201
4, vol. 28, no. 4, pp. 26-31, July-August 2014.

C. Jardak, J. Riihijärvi, F. Oldewurtel, and P. Mähönen
"Parallel Processing of Data from Very Large-Scale Wireless Sensor Networks"
Proc. of MAPREDUCE'10, in conjunction with
 ACM HPDC 2010, Chicago, Illinois, June 2010.

Frequency Allocation

J. Riihijärvi, M. Petrova, P. Mähönen and J. de Almeida Barbosa
Performance Evaluation of Automatic Channel Assignment Mechanism for
IEEE 802.11 Based on Graph Colouring
Proceedings of PIMRC'06, Helsinki, Finland, September 2006.

J. Riihijärvi, M. Petrova and P. Mähönen
Frequency allocation for WLANs using graph colouring techniques"
Proceedings of WONS'05, St. Moritz, Switzerland, January 2005 (Best paper award).

Models for Performance Evaluation

E. Meshkova, J. Riihijärvi, P. Mähönen
"Extending Graph-based Models of
 Wireless Network Structure with Dynamics"
Proc. of ACM MSWiM (Short paper), Paphos, Cyprus, October 2012.

V. Kolar, K. Bharath, N. B. Abu-Ghazaleh and J. Riihijärvi
"The Effect of Contention in CSMA Networks: Model and Fairness Protocol"
Elsevier Performance Evaluation, vol. 68, no. 9, pp. 782-805, September 2011.

J. Riihijärvi, J. Nasreddine, P. Mähönen
"Influence of Primary Network Structure and Dynamics on
Achievable Performance of Cognitive Wireless Networks
Proc. of IEEE DySPAN 2011, Aachen, Germany, May 2011.

M. Wellens, J. Riihijärvi and P. Mähönen
Modelling Primary System Activity in Dynamic Spectrum Access Networks 
Aggregated ON/OFF-Processes
in Proc. of 4th IEEE Workshop on Networking Technologies for SDR Networks 
in conjunction with SECON 2009, June 2009.

New Network Architectures

D. Trossen, J. Riihijärvi, P. Nikander, P. Jokela, J. Kjällman, J. Rajahalme
"Designing, implementing and evaluating a new internetworking architecture"
Elsevier Computer Communications, vol. 35, Iss. 17, pp. 2069-2081, 2012.

J. Rajahalme, M. Särelä, K. Visala and J. Riihijärvi
"On Name-Based Inter-Domain Routing"
Elsevier Computer Networks, vol. 55, no. 4, pp. 975-986, March 2011.

Middleware and Programming Interfaces

J. Ansari, E. Meshkova, W. Masood, A. Muslim, J. Riihijärvi, P. Mähönen
"CONFab: Ontology and Component based Optimization of

WSN Protocol Stacks with Deployment Feedback
Elsevier Computer Networks, Vol. 74, pp. 89-108, December 2014

M. Sooriyabandara, T. Farnham, P. Mähönen, M. Petrova, J. Riihijärvi, and Z. Wang
"Generic Interface Architecture Supporting

Cognitive Resource Management in Future Wireless Networks
IEEE Communications Magazine, vol. 49, no. 9, pp. 103-113, September 2011.

J. Riihijärvi, M. Petrova, V. Atanasovski and L. Gavrilovska
Extending Policy Languages with Utility and Prioritization Knowledge:
 The CAPRI approach"
Proc. of IEEE DySPAN 2010, Singapore, April 2010.

J. Riihijärvi, M. Petrova and P. Mähönen
A Common Application Requirement Interface for
 Cognitive Wireless Networks"
in Proc. of 4th IEEE Workshop on Networking Technologies for SDR Networks
in conjuction with SECON 2009, June 2009.

K. Rerkrai, J. Riihijärvi, P. Mähönen and F. Oldewurtel
"UDAE: Universal Data Access Engine for Sensor Networks"
Proc. of 5th Annual IEEE Conf. on Sensor, Mesh and Ad Hoc Communications and
Networks, SECON 2008, San Francisco, CA, USA, June 2008.

J. Riihijärvi, M. Wellens, and P. Mähönen
Link-Layer Abstractions for Utility-Based Optimization in
 Cognitive Wireless Networks"
Proceedings of IEEE CrownCom 2006, Mykonos, Greece, June 2006

Foreshadowing the Internet of Things

Z. Shelby, P. Mähönen, J. Riihijärvi, O. Raivio and P. Huuskonen
NanoIP: The Zen of Embedded Networking"
Proceedings of ICC 2003, Anchorage, Alaska, May 2003.

J. Riihijärvi, P. Mähönen, M. Saaranen, J. Roivainen and J.-P. Soininen
"Providing Network Connectivity for Small Appliances:

Functionally Minimized Embedded Web-Server
IEEE Communications Magazine, vol. 39, No. 10, pp. 74-79, October 2001.

Institute for Networked Systems
RWTH Aachen University

Kackertstrasse 9
52072 Aachen

Tel. +49 241 8020900
Fax. +49 241 80 620900