Tag Archives: modeling

Realistic Simulation

Realistic Simulation of Wireless Networks

Simulation is commonly used in networking research to prototype and validate new protocols and ideas. Hence, the realism of these simulators is crucial in order for the results they produce to be trustworthy and interpretable. To this end, we are working to find limitations in existing simulation methodologies and improve them through direct measurement, modeling, and implementation.

Selected Publications

  • Eric Anderson, Gary Yee, Caleb Phillips, Douglas Sicker, and Dirk Grunwald. The Impact of Directional Antenna Models on Simulation Accuracy. 7th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt 2009). Seoul, Korea. June 23 – 27, 2009.
  • Caleb Phillips, Suresh Singh, Douglas Sicker, and Dirk Grunwald. Techniques for Simulation of Realistic Infrastructure Wireless Network Traffic. 7th International Symposium on Modeling and Optimization in Mobile, Ad Hoc, and Wireless Networks (WiOpt 2009). Seoul, Korea. June 23 – 27, 2009.

Software and Data

Usable Coverage Mapping

Usable Coverage Mapping for Large Area Networks

PIs: Douglas Sicker and Dirk Grunwald

The problem of mapping the extent of “usable” coverage of an existing wireless network is important

Measurements of recieved signal strength of a municipal WiFi network in Portland, Oregon.

in a large number of applications, including communicating the abilities of the network to users, identifying
coverage gaps and planning expansion, and determining possible sources of interference with other
networks. Our research here addresses fundamental but unsolved problems of measurement-based wireless coverage mapping: where should measurements be made, how many are necessary, and what can be said about
the coverage at points that have not been measured.

Downloads

Selected Publications

  • Caleb Phillips, Douglas Sicker, and Dirk Grunwald. The Stability of the Longley-Rice Irregular Terrain Model for Typical Problems. University of Colorado at Boulder, Tech. Report. CU-CS-1086-11. September, 2011. (download)

  • Caleb Phillips, Douglas Sicker, and Dirk Grunwald. Bounding the Practical Error of Path Loss Models in Urban Environments. IEEE Dynamic Spectrum Access Networks 2011 (DySPAN 2011). Aachen, Germany. May 3-6, 2011.
  • Caleb Phillips, Scott Raynel, Jamie Curtis, Sam Bartels, Douglas Sicker, Dirk Grunwald and Tony McGregor. The Efficacy of Path Loss Models for Fixed Rural Wireless Links. Passive and Active Measurement Conference 2011 (PAM 2011). Atlanta, Georgia. March 20-22, 2011.
  • Caleb Phillips, Russell Senior, Douglas Sicker, and Dirk Grunwald. Robust Coverage and Performance Testing for Large-Area Wireless Networks. AccessNets 2008. Las Vegas, Nevada. October 15 – 17, 2008.

Caleb Phillips, Douglas Sicker, and Dirk Grunwald. The Stability of the Longley-Rice Irregular Terrain Model for Typical Problems. University of Colorado at Boulder, Tech. Report. CU-CS-1086-11. September, 2011. (download)

Directional and Phased Array Networks

Directional and Steerable Antennas for Optimizing Networks

PIs: Douglas Sicker and Dirk Grunwald

Directional Antennas emphasize gain in some directions and de-emphasize it in others. Steerable and phased array antennas allow these patterns to be changed in real-time.

As the demand for wireless networks grows, the research community continues to seekmethods for improving network performance. On method for improving network throughput involves using directional antennas to increase signal gain and/or decrease interference. Our work in this area focuses on real-world development and evaluation of directional and phased array antenna systems. To this end, we have built the first large-scale testbed of outdoor phased array antennas, suggested new models for directional antenna use in simulations based on measurements, and have proposed new protocols that optimize their behavior in both time and space.

Selected Publications

The CU WART testbed is the first wide area testbed of functional phased array antennas

  • Eric Anderson, Caleb Phillips, Douglas Sicker, and Dirk Grunwald. Signal Quality Pricing: Decomposition for Spectrum Scheduling and System Configuration. IEEE Dynamic Spectrum Access Networks 2011 (DySPAN 2011). Aachen, Germany. May 3-6, 2011.
  • Eric Anderson, Caleb Phillips, Douglas Sicker, and Dirk Grunwald. Modeling Environmental Effects on Directionality. Mathematical and Computer Modeling Journal. Special Issue on Modeling and Simulation of Wireless Networks. June, 2010. Elsevier.
  • Eric Anderson, Caleb Phillips, Douglas Sicker, and Dirk Grunwald. Challenges in Deploying Steerable Wireless Testbeds. TridentCom 2010. Berlin, Germany. May 18-20, 2010.
  • Gary Yee, Caleb Phillips, Douglas Sicker, and Dirk Grunwald. Wireless Networking Optimizations for Studying Algorithm Interactions. University of Colorado at Boulder, Tech. Report. CU-CS-1070-10. 2010.
  • Eric Anderson, Caleb Phillips, Douglas Sicker, and Dirk Grunwald. Modeling Environmental Effects on Directionality in Wireless Networks. 5th International workshop on Wireless Network Measurements (WiNMee 2009). Seoul, Korea. June 26, 2009.
  • Michael Buettner, Eric Anderson, Gary Yee, Dola Saha, Doug Sicker, Dirk Grunwald – A Phased Array Antenna Testbed for Evaluating Directionality in Wireless Networks. MobiEval ’07 , San Juan, Puerto Rico, USA, June, 2007.
  • Neufeld, M., Grunwald, D. – Using phase array antennas with the 802.11 MAC protocol. Broadband Networks, 2004. BroadNets 2004. Proceedings. First International Conference on pp. 733-735, 25-29 Oct. 2004

Software and Data Downloads