Seminar - Professor Yi Qian

Speaker

Professor Yi Qian, University of Nebraska-Lincoln, USA

Title

A Performance Modeling Framework for Dynamic Behavior of Mobile Ad Hoc Networks

Abstract

There has been a great volume of work on mobile ad-hoc network communications and protocols, and the research is ongoing to expand the scope and quality of service of these networks. The performance of mobile ad-hoc networks is normally studied via simulation over a fixed time horizon using a steady-state type of statistical analysis procedure. However, due to the dynamic nature of the network topology, such an approach is inappropriate in many cases as the network can remain in a transient or nonstationary state most of the time. In this seminar, we present a performance modeling framework and detailed techniques for analyzing the time varying performance of mobile ad-hoc networks. Our approach is a hybrid of discrete event simulation and numerical analysis techniques. Network queues are modeled using fluid-flow based differential equation models which are solved using numerical methods, while node mobility is modeled using either discrete event simulation techniques or stochastic modeling of adjacency matrix elements. Extensions of the basic model include incorporating energy consumption, interference and propagation effects into the hybrid modeling framework to improve its fidelity.

Speaker's biography

Yi Qian received a Ph.D. degree in electrical engineering from Clemson University. Currently he is an Associate Professor in the Department of Computer and Electronics Engineering, University of Nebraska-Lincoln (UNL). His research interests include information assurance and network security, network design, network modeling, simulation and performance analysis for next generation wireless networks, wireless ad-hoc and sensor networks, vehicular networks, broadband satellite networks, optical networks, high-speed networks and the Internet. Prior to joining UNL, he worked in the telecommunications industry, academia, and the U.S. government. Some of his previous professional positions include serving as a senior member of scientific staff and a technical advisor at Nortel Networks, a senior systems engineer and a technical advisor at several start-up companies, an Assistant Professor at University of Puerto Rico at Mayaguez, and a senior researcher at National Institute of Standards and Technology. He has a successful track record to lead research teams and to publish research results in leading scientific journals and conferences. Several of his recent journal articles on wireless network design and wireless network security are among the most accessed papers in the IEEE Digital Library. Dr. Yi Qian is a member of ACM and a senior member of IEEE.

Invited by Professor Weihua Zhuang.  This is a presentation of the IEEE Vehicular Technology Chapter.