Abolfazl MehbodniyaWireless Signal Processing and Networking Laboratory, Graduate School of Engineering, Dept. of Communications Engineering, Tohoku University, 6-6-05 Aza-Aoba, Aramaki, Sendai 980-8579, Japan

Fumiyuki AdachiWireless Signal Processing and Networking Laboratory, Graduate School of Engineering, Dept. of Communications Engineering, Tohoku University, 6-6-05 Aza-Aoba, Aramaki, Sendai 980-8579, Japan


The information and communication technology (ICT) data traffic is expected to increase 1,000 fold by 2020. This increasing demand is quickly draining the scarce radio resources and will eventually affect our nations' economy. This strongly motivates the need for intensive research on the next generation of wireless networks. Beyond conventional cellular data, machine-to machine (M2M) and device to device (D2D) communication will be responsible for a big portion of the wireless traffic in the next few years. This will, in turn, further strain existing wireless infrastructure and require novel designs. According to recent forecasts, there will be 12.5 billion inter-connected machine-type devices worldwide by the year 2020, up from 1.3 billion in 2012. For coping with such traffic growth, it is well known that the major technique for meeting a much needed 1000x capacity improvement will be a byproduct of massive network densification. The idea is to introduce heterogeneous networks (HetNets) having new, additional nodes, such as small cell

base stations, deployed within local-area range and making the network closer to the end-users. The integration of macro/micro/pico/small cell base stations (SBSs) with disparate cell sizes and capabilities, has already been approved as a working item in LTE-advanced and 5G. Such hyper-dense and heterogeneous networks (HDHNs) can significantly improve spatial frequency reuse and coverage, thus meeting the wireless capacity crunch. For example, it is envisioned that a viral and hyper-dense deployment of low-cost small cells in the near future, with 200-300 small cells per typical macro cell coverage, approaching one-to-one ratio with the number of UEs. Such HDHNs are characterized by two unique features: a) massive number of devices and b) highly dynamic environment. How to manage, operate, and optimize such hyper-dense, dynamic networks, in an energy-efficient and sustainable manner, is an important research challenge that has recently received significant research interest from both academia and industry. The main goal of this tutorial is to introduce different aspects of designing HDHNs with advanced capabilities while focusing on spectral-efficiency (SE) and energy-efficiency (EE). In particular, we will introduce a plethora of techniques that include stochastic geometry, fuzzy logic, and game-theory that are necessary for deploying and operating large-scale, self-organizing HDHNs that can be used to support various communication systems with seamless mobility.

Intended Audience

The potential audience includes researchers from both academia and industry, including graduate and undergraduate students who are interested in learning novel analytical techniques that can lay the foundations of the future energy-efficient hyper-dense heterogeneous wireless networks (HDHNs). In particular, this tutorial is expected to attract a large crowd which can include:

  • Researchers and communication engineers in both industry and academia looking for a comprehensive introduction on future wireless systems, and potential applications.
  • Researchers and communication engineers interested in learning new network design tools such as stochastic geometry and game theory which are of paramount importance for the analysis of next-generation systems, particularly, in hyper-dense environments.
  • Graduate students pursuing interdisciplinary wireless and networking research who are interested in studying novel network planning, design, and optimization techniques.
  • Researchers interested in better understanding the future of wireless systems and ongoing activities in both academia and industry.

Tutorial Goals

  • A comprehensive knowledge of current trends and developments in wireless communications with a focus on hyper-dense systems which will be the pillar of next-generation wireless networks.
  • The challenges and design problems facing the introduction of sustainable, energy-efficient communication systems.
  • An overview on the state-of-the-art results and literature on HDHNs and the key roadmap for the future.
  • A comprehensive overview on innovative techniques, such as stochastic geometry and game theory, used in designing SON and radio resource management modules for HDHNs.
  • Future research directions and open problems in the area of energy-efficient HDHNs.


About the Presenters


Abolfazl Mehbodniya received his Ph.D degree from the National Institute of Scientific Research-Energy, Materials, and Telecommunications (INRS-EMT), University of Quebec, Montreal, QC, Canada in 2010. From 2010 to 2012 he was a JSPS postdoctoral fellow at Tohoku University. Since Jan 2013, he has been an assistant professor at department of communications engineering, Tohoku University. Dr. Mehbodniya has 10+ years of experience in electrical engineering, wireless communications, and project management. He has over 40 published conference and journal papers in the areas of radio resource management, sparse channel estimation, interference mitigation, short-range communications, 4G/5G design, OFDM, heterogeneous networks, artificial neural networks (ANNs) and fuzzy logic techniques with applications to algorithm and protocol design in wireless communications. He is the recipient of JSPS fellowship for foreign researchers, JSPS young faculty startup grant and KDDI foundation grant.


Fumiyuki Adachi received the B.S. and Dr. Eng. degrees in electrical engineering from Tohoku University, Sendai, Japan, in 1973 and 1984, respectively. In April 1973, he joined the Electrical Communications Laboratories of NTT and conducted various types of research related to digital cellular mobile communications. From July 1992 to December 1999, he was with NTT DoCoMo, where he led a research group on Wideband CDMA for 3G systems. Since January 2000, he has been with Tohoku University, Sendai, Japan, where he is a Distinguished Professor of Communications Engineering at the Graduate School of Engineering.

Professor Adachi is an IEEE Fellow and an IEICE Fellow. He is a pioneer in wireless communications since 1973 and has largely contributed to the design of wireless networks from 1 generation (1G) to 4G. He is listed on and is an IEEE Vehicular Technology Society Distinguished Lecturer since 2012. He is a vice president of IEICE Japan since 2013. He was a recipient of the IEEE Vehicular Technology Society Avant Garde Award 2000, IEICE Achievement Award 2002, Thomson Scientific Research Front Award 2004, Ericsson Telecommunications Award 2008, Telecom System Technology Award 2010, Prime Minister Invention Award 2010, and KDDI Foundation Excellent Research Award 2012. His research interests include wireless signal processing for wireless access, equalization, transmit/receive antenna diversity, MIMO, adaptive transmission, channel coding, and wireless systems.