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University: Berlin Institute of Technology
Professor: Adam Wolisz 
Department: School of Electrical and Computer Engineering
Research Group: Telecommunication Networks Group (TKN)

Upcoming Teaching Project (starting October 2013):
being part of the course "Project Communication Networks"


Title: Comparison of Power-Saving Mechanisms in IEEE 802.11 and 802.16 Networks

Topic Description:

Today, the diversity of wireless communication technologies is still increasing. To be everywhere and everytime online as well as available, more and more technologies are incorporated into end devices. This does not hold only for notebooks but also for the very popular smart phones, which support the classical GSM/UMTS network stack and additionally include extensions such as WLAN and Bluetooth as well as WiMax in the near future.
Still, the energy efficiency is a big issue for mobile devices being equipped with heterogeneous, wireless technologies. Thus, a decision for chosing a specific access technology for a communication session may also want to consider its power saving capabilities: this has to deal not only with the power consumption on the one hand, but also with the service interruptions and the signalling overhead on the other hand. In this study, we will focus on WLAN and WiMax power saving and will compare these regarding the required signalling load, the gains in power saving and the tolerable interruption gaps.

Task Description:

In order to enable a comparison of power-saving mechanisms in WLANs and WiMax, this project investigates both technologies simulatively with OPNET regarding its vulnerability to fading and background load.
  • literature studies regarding IEEE 802.11 and IEEE 802.16 power save mechanisms,
  • tutorials / training on OPNET simulator and relevant models,
  • parameterization of fading environment and background load,
  • simulative comparison of interruption times for VoIP traffic under the presence of fading and background load.
  • lectures communication networks, mobile communications, and performance evaluation,
  • excellent programming skills,


Sven Wiethoelter, wiethoel@tkn.tu-berlin.de


Authored Papers acknowleging OPNET's support:

Marc Emmelmann, Sven Wiethoelter, and Hyung-Taek Lim, "Influence of Network Load on the Performance of Opportunistic Scanning", In IEEE Conference on Local Computer Networks (LCN), pp. 1-8, Zurich, Switzerland, October 2009.

Marc Emmelmann, Sven Wiethoelter, and Hyung-Taek Lim, "Opportunistic Scanning: Interruption-Free Network Topology Discovery for Wireless Mesh Networks", In International Symposium on a World of Wireless, Mobile and Multimedia Networks (IEEE WoWMoM), pp. 1 -- 6, Kos, Greece, June 2009.

O. Puņal, J. Gross, and M. Emmelmann. Implementing Frequency Selective Fading for OPNET's Wireless LAN Modules. In Proc. of OPNETwork 2008, Washington DC, USA, October 2008.

J. Gross, M. Emmelmann, O. Punal, and A. Wolisz, "Dynamic Single-User OFDM Adaptation for IEEE 802.11 Systems", In Proc. ACM/IEEE International Symposium on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWIM 2007), pp. 124-132, Chania, Crete Island, October 2007.


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