Distributed Cognitive Random Access of Unslotted Markovian Channels under Tight Collision Constraints

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Date: November 26, 2019
Time: 11:30 a.m. - 12:20 p.m.
Location: Old Main #106 | Map
4841 Cass
Detroit, MI 48201
Category: Seminar

Abstract: The co-existence of perceived scarcity of wireless spectrum and many significantly underutilized licensed bands has urged more efficient and dynamic spectrum allocation and use. As the key enabling technology to the so called “Dynamic Spectrum Access (DSA)”, Cognitive Radio (CR) allows unlicensed users, called secondary users (SUs), to identify the “spectrum holes” of licensed channels and utilize them opportunistically as long as they do not cause collisions to the communications of licensed users, called primary users (PUs), beyond a prescribed level. In this talk, I will discuss the design of distributed strategies that allow multiple SUs to opportunistically access multiple unslotted Markovian channels with unknown parameters and tight collision constraints, a practical yet challenging problem that has not been well addressed by existing work. I will talk about the state-of-art solutions and present our approach that strikes an optimal balance among exploration, exploitation, and competition.  

Bio: Dr. Zhang is an associate professor in the Department of Computer and Information Sciences at Indiana University South Bend. He received his Ph.D. in Computer Science from Wayne State University in 2005. His research interests broadly include wireless networking and mobile computing, cyber-physical systems, resource allocation for networked and distributed systems, and network security. His recent research focuses on cognitive networks, machine learning in networks and distributed systems, and SLAM (simultaneous localization and mapping) for robotics. His work has been published in various peer-reviewed conference proceedings and archived journals, including The Proceedings of the IEEE, IEEE Transactions on Parallel and Distributed Systems, IEEE Transactions on Computers, and IEEE Transactions on Mobile Computing. Dr. Zhang was the founding Program Co-Chair of the First International Workshop on Wireless Mesh and Ad Hoc Networks (WiMAN 2007). He was the Program Co-Chair for the ICCCN 2013 Track on Sensor Networks, Embedded Systems, and Pervasive Computing, the Workshop General Co-Chair of ICCCN 2011, ICCCN 2010, and GLOBECOM 2010. He was a guest editor of ACM Transactions on Autonomous and Adaptive Systems, Elsevier's Computer Communications journal, and International Journal of Distributed Sensor Networks. Dr. Zhang received an Outstanding Leadership Award from GLOBECOM 2010 and ICCCN 2014. 


LaNita Stewart




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