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Mobile Information Systems
Volume 2016 (2016), Article ID 5909801, 12 pages
Research Article

CBRS Spectrum Sharing between LTE-U and WiFi: A Multiarmed Bandit Approach

1Department of Electrical & Computer Engineering, Florida International University, Miami, FL 33174, USA
2Department of Electrical & Computer Engineering, North Carolina State University, Raleigh, NC 27513, USA
3Department of Communications Engineering, University of Oulu, 90014 Oulu, Finland

Received 31 March 2016; Revised 14 June 2016; Accepted 19 July 2016

Academic Editor: Miguel López-Benítez

Copyright © 2016 Imtiaz Parvez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The surge of mobile devices such as smartphone and tablets requires additional capacity. To achieve ubiquitous and high data rate Internet connectivity, effective spectrum sharing and utilization of the wireless spectrum carry critical importance. In this paper, we consider the use of unlicensed LTE (LTE-U) technology in the 3.5 GHz Citizens Broadband Radio Service (CBRS) band and develop a multiarmed bandit (MAB) based spectrum sharing technique for a smooth coexistence with WiFi. In particular, we consider LTE-U to operate as a General Authorized Access (GAA) user; hereby MAB is used to adaptively optimize the transmission duty cycle of LTE-U transmissions. Additionally, we incorporate downlink power control which yields a high energy efficiency and interference suppression. Simulation results demonstrate a significant improvement in the aggregate capacity (approximately 33%) and cell-edge throughput of coexisting LTE-U and WiFi networks for different base station densities and user densities.