Spectrum Usage Understanding and Dynamic Spectrum Sharing

Dynamic spectrum access has been a subject of extensive study in recent years. The increasing volume of literature calls for a deeper understanding of the characteristics of current spectrum utilization. In this talk, I will first present some results we obtained from a detailed spectrum measurement study, with data collected in the 20MHz to 3GHz spectrum band and at four locations concurrently in Guangdong province of China. We examine the first and second order statistics of the collected data, including channel occupancy/vacancy statistics, channel utilization within each individual wireless service, and the temporal, spectral, and spatial correlation of these measures.

I will then further discuss a stochastic differential equation based wireless spectrum utilization model that we proposed which can accurately captures the dynamic changes in the channel condition induced by the primary users’ activities. Interesting, our large-scale spectrum occupancy measurement study reveals significantly unbalanced usage of spectrum bands owned by different wireless service providers (WSPs) in several representative locations in China. Such imbalance motivates us to consider the cooperation among WSPs to share their spectrum resources. With spectrum-based cooperation in mind, we propose a new wireless market paradigm, where the future wireless service provision will probably be associated with cooperation, in the form of spectrum resource exchange: while each WSP has its own deployed infrastructure (including multiple base stations) and operating spectrum, they can cooperate with each other to share their spectrum in form of time portion.

Finally, I would like to conclude my talk with some other efforts we have been spend related to dynamic spectrum management.

Speaker Details

Dr. Zhang joined Hong Kong University of Science and Technology in Sept. 2005 as an Associate Professor. She is now the co-director of Huawei-HKUST innovation lab and the associate 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 about 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.

Dr. Zhang has received TR 100 (MIT Technology Review) world’s 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 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. She was also served as the Associate Editor for IEEE Transactions on Wireless Communications and IEEE Transactions on Vehicular Technologies. Dr. Zhang was the CHAIR of the Multimedia Communication Technical Committee of the IEEE Communications Society from 2008 to 2010. 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.

Date:
Speakers:
Qian Zhang
Affiliation:
Hong Kong University of Science and Technology

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