The evolution of cognitive (secondary) networks to enable more efficient spectrum usage will rely on fast and accurate spectrum sensing/mapping, supported by a suitable architecture for data integration and model building. In the first part of the talk, fundamental aspects of the wide-area RF mapping problem as a grand challenge will be highlighted; and some recent work at UW that underpin sub-system level trade-offs (between scan latency and channel status estimation accuracy) for channel sensing described. Next, the role of centralized databases in RF map creation for enabling primary-to-secondary and secondary-to-secondary coexistence is explored and a hybrid architecture proposed – that involves both distributed (crowd-sourced) local sensing as well as it’s integration into databases. Finally, some ongoing work regarding a fundamental question: how much white space capacity is actually available – will be described.
Sumit Roy (Fellow, IEEE) received the B. Tech. degree from the Indian Institute of Technology (Kanpur) in 1983, and the M. S. and Ph. D. degrees from the University of California (Santa Barbara), all in Electrical Engineering in 1985 and 1988 respectively, as well as an M. A. in Statistics and Applied Probability in 1988. Presently he is Integrated Systems Professor of Electrical Engineering, Univ. of Washington where his research interests broadly encompass analysis/design of wireless communication and sensor networked systems. His recent research emphasis includes multi-standard wireless inter-networking and cognitive radios, vehicular and sensor networking involving RFID technology and networking for the emerging Smart Grid. He spent 2001-03 on academic leave at Intel Wireless Technology Lab as a Senior Researcher engaged in systems architecture and standards development for ultra-wideband systems (Wireless PANs) and next generation high-speed wireless LANs. He served as Isaac Walton Fellow at University College Dublin for Jan-Jun 2008, and as a UK Royal Acad. Engineering Distinguished Visitor for summer 2011. His activities for the IEEE Communications Society (ComSoc) includes membership of several technical and conference program committees, notably the Technical Committee on Cognitive Networks and is currently a ComSoc Distinguished Lecturer for 2014-15. He has served as Associate Editor for IEEE Trans. Communications, IEEE Trans. Wireless Communications and IEEE Trans. Smart Grids, and currently serves on the Editorial Board for IEEE Trans. Circuits & Systems II Express Briefs. Most recently, he served as a Guest Editor for the 2014 J. Selected Areas Communications Spl. Issue on Smart Grid Communications.