Arizona State University Network Science Seminar Series

Random Access with Energy Harvesting Nodes

Speaker Tolga M. Duman (Bilkent University)
Date 3:00 p.m., Feb 20, 2019
Location GWC 487
Short Bio
Tolga M. Duman is a Professor of Electrical and Electronics Engineering Department at Bilkent University in Turkey. He received the B.S. degree from the same university in 1993, M.S. and Ph.D. degrees from Northeastern University, Boston, MA, in 1995 and 1998, respectively, all in electrical engineering. Prior to joining Bilkent University, he has been with the Electrical Engineering Department of Arizona State University. Dr. Duman's current research interests are in systems, with particular focus on communications and signal processing, including wireless and mobile communications, coding/modulation, coding for wireless communications, data storage systems and underwater acoustic communications. Dr. Duman is a Fellow of IEEE, a recipient of the National Science Foundation CAREER Award and IEEE Third Millennium medal. He has served as an editor for various journals, and he is currently the coding and information theory area editor of IEEE Trans. on Communications and the Editor-in-Chief of Elsevier's Physical Communication.
We propose an irregular repetition slotted ALOHA (IRSA) based uncoordinated random access scheme for energy harvesting (EH) nodes. Specifically, we consider the case in which each user has a battery that is recharged with harvested energy from the environment in a probabilistic manner. We analyze this scheme starting with a unit-sized battery at the nodes and extend the analysis to the case of finite-sized battery. For both scenarios, we derive asymptotic throughput expressions, and obtain optimized probability distributions for the number of packet replicas for the users. We demonstrate that for the case of IRSA with EH nodes, these optimized distributions perform considerably better than the alternatives, especially in the limited battery scenarios, including slotted ALOHA (SA), contention resolution diversity slotted ALOHA (CRDSA) and IRSA, which do not take into account the EH process for both asymptotic and finite frame length scenarios. We also present some extensions of the asymptotic analysis to the contention resolution ALOHA without any slot synchronization.


Title Speaker Time Location
Random Access with Energy Harvesting Nodes Tolga M. Duman (Bilkent University) 3:00 p.m., Feb 20, 2019 GWC 487