Protocol Design Challenges and Applications for Distributed Cognitive Radio Networks
Prof. Kaushik Chowdhury
Northeastern University, Boston, MA, USA
DEI - Sala Seminari
2 Novembre 2011
Cognitive radio (CR) technology allows devices to share the wireless spectrum with other users that have a license for operation in these spectrum bands. This area of research promises to solve the problem of spectrum scarcity in the unlicensed bands, and improve on the inefficient spectrum utilization. This talk is composed of two parts: The first part focuses on highlighting the challenges in the design of link-layer and end-to-end protocols for different infrastructure-less CR networks. At the link layer, an interferer classification scheme is proposed that is used to adapt the MAC packet scheduling based on the specific type of the detected interferer. For reliable end-to-end communication, a TCP-based transport layer is developed that accounts for disruptions caused by periodic sensing and spectrum unavailability. The second part of this presentation describes recent advances in CR vehicular networks, emphasizing the need of cooperative sensing, and channel allocation by anticipating spectrum availability along the expected path of the vehicle. The talk concludes by listing the challenges and simulator enhancements for undertaking accurate and detailed performance evaluation of such spectrum-aware, distributed networks.
Kaushik Chowdhury (email@example.com) is Assistant Professor in the Electrical and Computer Engineering Department at Northeastern University, Boston, MA, USA. He graduated with B.E. in Electronics Engineering with distinction from VJTI, Mumbai University, India, in 2003. He received his M.S. in Computer Science from the University of Cincinnati, OH, in 2006, and Ph.D. from the Georgia Institute of Technology, Atlanta, GA in 2009. His M.S. thesis was given the outstanding thesis award jointly by the ECE and CS departments at the University of Cincinnati. He received the Best Paper Award at the IEEE ICC Conference in 2009, in the Ad Hoc and Sensor Network Symposium. He is currently serving as the guest editor of the Elsevier Ad Hoc Networks journal, special issue on Cognitive Radio Ad Hoc Networks, and as a regular area editor for the same journal. He has served as the technical chair/co‐chair in several workshops on the topic of wireless networks over the past several years, and is the Vice Chair for the IEEE Technical Committee on Simulation.
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