Call for Papers
1 May 2012
Paper submission deadline
17 Dec 2012
Acceptance Notifications
28 Feb 2013
Camera ready papers
15 Apr 2013
1-4 July 2013

Invited speakers

Iztok Humar, Ph. D.
Assistant Professor at the University of Ljubljana, Slovenia
Energy efficiency of cellular networks including embodied energy


The continuous increase in energy consumption in telecommunication networks requires rethinking their energy efficiency. In this presentation, we will focus on cellular mobile networks. Current research indicates that one third of operating energy could be saved by reducing the transmission power of base stations. However, this approach requires the introduction of a range of additional equipment containing more embodied energy — consumed by all processes associated with the production of equipment. Furthermore, a new cellular network energy efficiency model with embodied energy is proposed, and optimization between the number of cells and their coverage is investigated. Contrary to previous works, we have found that embodied energy accounts for a significant proportion of total energy consumption and cannot be neglected. The simulation results confirm an important trade-off between operating and embodied energies, which can provide some practical guidelines for designing energy-efficient cellular access networks. The new model considering embodied energy is not limited to just cellular networks, but to other telecommunications, such as wireless local area networks and wired networks.


Iztok Humar received B.Sc., M.Sc. and PhD degrees in the field of Telecommunications at the Faculty of Electrical Engineering, University of Ljubljana, Slovenia, in 2000, 2003, and 2007 respectively. He also received PhD in the field of Information Management at the Faculty of Economics, University of Ljubljana, Slovenia, in 2009. In 2000 he joined Laboratory for Telecommunications as a researcher and teaching assistant. From 2004 - 2009 he was Senior Lecturer. Currently, he is an Assistant professor at the Faculty of Electrical Engineering, Slovenia, where he lecturers on The Fundamentals of Electromagnetics and Design, Management and Modeling of Telecommunication Networks. He is supervisor of many undergraduate and some postgraduate students.

His main research topics include the design, planning and management of telecommunications networks and services, as well as measurement and modeling of network loads and traffic. In 2010, he was a three-month Visiting Professor and Researcher at Huazhong University of Science and Technology, Wuhan, China, where he gave lectures and performed research on energy-efficient wireless networks. He is involved in many research and national industry projects as well in projects funded by EU FP and structural and Cohesion EU funds. Dr. Humar served as Chair of Vitel – national workshop from the field of telecommunications. He is a Senior member of IEEE Communication Society and a member of Electrical Association of Slovenia. He serves as IEEE Communication Society of Slovenia Chapter Chair.

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