题　目：Cognitive Radio Based Multi-Channel MAC Protocols for Wireless Ad Hoc Networks

报告人：Prof. Xi Zhang（Networking and Information Systems Laboratory, Department of Electrical and Computer Engineering, Texas A&M University, College Station, USA）

时　间：2008年5月9日（周五）下午2:00

地　点：玉泉校区信电楼4楼学术报告厅

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Abstract

We propose cognitive-radio-based multi-channel medium access control (MAC) protocols, which integrate the spectrum sensing and packet scheduling, for the wireless ad hoc networks. Specifically, our MAC protocols allow the secondary users to identify and use the available frequency spectrum while constraining the level of interference to the primary users. In our scheme, each secondary user is equipped with two transceivers -- one tuned to a dedicated control channel and the other used as a cognitive radio dynamically sensing and using the identified available channels. To obtain the channel status accurately, we propose two collaboratively channel-sensing policies -- the random sensing policy and negotiation-based sensing policy, to help the MAC protocols detect the available channels. We develop the Markov chain model and the M/G^Y/1-based queueing model to validate and evaluate the performance of our proposed multi-channel MAC protocols under the two proposed channel sensing policies in terms of the network aggregate throughput and packets transmission delays.

Biography

Prof. Xi Zhang received his Ph.D. in Electrical Engineering and Computer Science (EE--Systems) from The University of Michigan, Ann Arbor. He is Associate Professor and the Founding Director of the Department of Electrical and Computer Engineering at Texas A&M University. He has published more than 100 research papers in the areas of wireless networks, Internet protocols, communications theory, signal processing, information theory, multimedia, and stochastic control systems. He received the U.S. NSF CAREER Award in 2004. He received the Best Paper Award in the IEEE Globecom 2007. He also received the TEES Select Young Faculty Award for Excellence in Research Performance from the College of Engineering at Texas A&M University in 2006. He is currently an Editor for the IEEE Transactions on Wireless Communications, an Associate Editor for the IEEE Transactions on Vehicular Technology, an Associate Editor for the IEEE Communications Letters, an Editor for Wiley's Journal on Wireless Communications and Mobile Computing, an Editor for the Journal of Computer Systems, Networking, and Communications, an Associate Editor for Wiley's Journal on Security and Communications Networks. He is also serving or has served as a Guest Editor for the IEEE Journal on Selected Areas in Communications for the Special Issue on "Resource Allocations for Wireless Video Traffic", a Guest Editor for the IEEE Wireless Communications Magazine for the Special Issue on "Next Generation of CDMA versus OFDMA for 4G Wireless Applications", and a Guest Editor for the Wiley's Journal on Wireless Communications and Mobile Computing for the Special Issue on "Next Generation Wireless Communications and Mobile Computing Networks". He is currently serving as a Program Co-Chair for the IEEE INFOCOM 2009 Mini-Conference. He is also serving as a Co-Chair for IEEE Globecom 2008 - Wireless Communications Symposium, as a Co-Chair for IEEE ICC 2008 - Information and Network Security Symposium, Technical Program Chair for IEEE/ACM International Wireless Communications and Mobile Computing Conference 2008, the Symposium Chair for IEEE/ACM International Symposium on Cross-Layer Optimized Wireless Networks 2006~2008. He has served as a Demo/Poster Co-Chair for the IEEE INFOCOM 2008 and also served as a Student Travel Grants Co-Chair for the IEEE INFOCOM 2007. He has also served as a Chair/Co-Chair for numerous other IEEE/ACM conferences and as a technical committee member for more than 50 IEEE/ACM conferences, including IEEE INFOCOM, IEEE Globecom, IEEE ICC, etc. He has also frequently served as a panelist for the U.S. NSF research proposal panels.