Event
Special Seminar: "Age of Information Modeling and Optimization"
Thursday, January 5, 2023
2:00 p.m.
Room 2460 A. V. Williams or Zoom
Darcy Long
301 405 3114
dlong123@umd.edu
Age of Information Modeling and Optimization
Speaker: Nail Akar, Professor, Bilkent University, Ankara, Turkey
Zoom Link: https://umd.zoom.us/j/99196841038?pwd=b3NRZjhGZWp3NXlsQko4cTVDQWpDZz09
Abstract: Timely status updates play a key role in networked control and monitoring systems. The concepts of Age of Information (AoI) and Peak AoI (PAoI) have been introduced in order to quantify the timeliness of information freshness in status update systems. In this talk, a novel technique based on absorbing Markov chains will be introduced to obtain the exact distributions of AoI/PAoI systematically for a wide variety of multi-source status update systems in both continuous- and discrete-time. The set of ideas that paved the way for the proposed modeling approach will be described in detail for two simple but representative scenarios. For the optimization part of the talk, a scheduler is first introduced for the Generate-at-Will scenario for weighted sum PAoI minimization thanks to the availability of simple closed-form expressions for mean PAoI in status update systems. Moreover, the superiority of the proposed scheduler over the currently deployed proportional fair schedulers in wireless networks for age-sensitive traffic will be demonstrated. Finally, I will introduce a water-filling based scheduler proposed to be used in multi-item cache update systems to minimize the weighted sum binary freshness where the goal is to synchronize the time-varying items between the server and the cache.
Bio: Nail Akar received his B.S. degree from Middle East Technical University, Turkey, in 1987 and M.S. and Ph.D. degrees from Bilkent University, Ankara, Turkey, in 1989 and 1994, respectively, all in electrical and electronics engineering. From 1994 to 1996, he was a visiting scholar and a visiting assistant professor in the Computer Science Telecommunications program at the University of Missouri - Kansas City, USA. He joined the Technology Planning and Integration group at Long Distance Division, Sprint, Overland Park, Kansas, in 1996, where he held a senior member of technical staff position from 1999 to 2000. Since 2000, he has been with Bilkent University currently as a Professor of the Electrical and Electronics Engineering Department and as the Associate Dean of the Faculty of Engineering. He visited the School of Computing, University of Missouri - Kansas City, as a Fulbright scholar in 2010 for a period of six months. His research interests are on information freshness, performance modeling of computer and communication systems and networks, wireless networks, Internet of Things, queueing theory, and optimization.
Host: Prof. Sennur Ulukus, ECE Chair
