Cooperation in Cognitive Radio Networks
Qian Zhang (Hong Kong University of Science and Technology)
APPLIED SIGNAL PROCESSING SERIESDATE: 2011-08-24
TIME: 11:00:00 - 12:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU
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ABSTRACT:
Today's wireless networks are regulated by fixed spectrum assignment policy, under which fixed spectrum slices will be assigned to license holders on a long term basis. As the demands for new wireless services are accelerating, it has been reported that there is basically no more spectrum to allocate. However, there exist a large number of frequency bands that are significantly under-utilized. To cope with such a dilemma, dynamic spectrum access with cognitive radio has recently been investigated, which is a novel paradigm that improves the spectrum utilization by allowing secondary users to reuse the unused spectrum owned by primary licensed users. Particularly, unlicensed wireless users (secondary users) dynamically access the licensed bands from legacy spectrum holders (primary users) on a negotiated or an opportunistic basis.
In this talk, we will discuss different modes of cooperation in dynamic spectrum access. We will first discuss the cooperation among secondary users only, where the primary users do not leverage secondary users for their own data transmissions. A cooperative relay idea will be introduce in detail for cognitive radio networks to fulfill the heterogeneous traffic demand from secondary users by fully leveraging the unbalanced spectrum usage and availability within the secondary CRN. Then, the cooperation among primary and secondary users will be discussed, where the primary users leverage secondary users for their own data transmissions. We propose a novel cooperative cognitive radio framework, which enable the primary user to actively involve secondary users as the cooperative relays. A payment mechanism, where secondary users pay charges to primary user in order to achieve the access opportunity, is designed under this framework.
BIO:
Qian Zhang joined the Hong Kong University of Science and Technology in Sept. 2005 where she is a full Professor in the Department of Computer Science and Engineering. She is also serving as the co-director of Huawei-HKUST innovation lab and the director of digital life research center of HKUST. Before that, she was in Microsoft Research Asia, Beijing, from July 1999, where she was the research manager of the Wireless and Networking Group. Dr. Zhang has published more than 200 refereed papers in international leading journals and key conferences in the areas of wireless/Internet multimedia networking, wireless communications and networking, wireless sensor networks, and overlay networking. She is the inventor of about 30 pending International patents. Her current research is on cognitive and cooperative networks, dynamic spectrum access and management, as well as wireless sensor networks.
Dr. Zhang has received TR 100 (MIT Technology Review) worldas top young innovator award. She also received the Best Asia Pacific (AP) Young Researcher Award elected by IEEE Communication Society in year 2004. She received the Best Paper Award in Multimedia Technical Committee (MMTC) of IEEE Communication Society in 2005 and Best Paper Award for QShine 2006, IEEE Globecom 2007, IEEE ICDCS 2008, and IEEE ICC 2010. She received the Oversea Young Investigator Award from the National Natural Science Foundation of China (NSFC) in 2006. She has been elected as IEEE Communication Society Distinguished Lecture from Jan. 2010 to Dec. 2011.
Dr. Zhang is the Editorial Board Member of IEEE Transactions of Multimedia, IEEE Transactions on Mobile Computing, IEEE Wireless Communications Magazine, IEEE Communications Surveys and Tutorials, Elsevier Computer Communications, and Elsevier Computer Networks. Dr. Zhang is the steering committee member of IEEE Transactions of Multimedia. She was also served as the Associate Editor for IEEE Transactions on Wireless Communications and IEEE Transactions on Vehicular Technologies. She served as Guest Editor for special issue on wireless video in IEEE wireless Communication Magazine, special issue on Cross-layer Optimized Wireless Multimedia Communications in IEEE Journal on Selected Areas in Communications (JSAC), special issue on Wireless Sensor Networking in IEEE Wireless Communication Magazine, special issue on Wireless Multimedia Sensor Networks in Elsevier Computer Networks, special issue on Wireless Mesh Networks in ACM/Springer Journal of Mobile Networks and Applications (MONET), feature topic on Advances in Wireless VoIP in IEEE Communications Magazine, and special issue on Quality-Driven Cross-Layer Design for Multimedia Communications in IEEE Transactions on Multimedia.
Dr. Zhang was the CHAIR of the Multimedia Communication Technical Committee of the IEEE Communications Society from 2008 to 2010. She is Chair of Chapter Coordination Committee of IEEE Asia Pacific Board (APB) of IEEE Communication Society. Dr. Zhang is also a member of the Visual Signal Processing and Communication Technical Committee and the Multimedia System and Application Technical Committee of the IEEE Circuits and Systems Society. She is the senior member of IEEE from 2004.
Dr. Zhang received the B.S., M.S., and Ph.D. degrees from Wuhan University, China, in 1994, 1996, and 1999, respectively, all in computer science.
