Title: Spectrum sharing model for OFDMA macro-femtocell networks

Authors: Rebeca Estrada; Hadi Otrok; Zbigniew Dziong; Hassan Barada

Addresses: Electrical Engineering Department, École de Technologie Supérieure, Montréal, QC, H3C 1K3, Canada ' Faculty of Engineering, Khalifa University of Science, Technology and Research, P.O. Box 127788, Abu Dhabi, UAE ' Electrical Engineering Department, École de Technologie Supérieure, Montréal, QC, H3C 1K3, Canada ' Faculty of Engineering, Khalifa University of Science, Technology and Research, P.O. Box 127788, Abu Dhabi, UAE

Abstract: Enhancing the network throughput while supporting non-uniform user distribution and dense femtocell deployment is a challenge in OFDMA networks. Previous research works focus on spectrum partitioning or spectrum sharing with interference managements regardless the user distribution or mobility. In this paper, we propose a spectrum sharing approach that maximises the network throughput using Linear Programming. Power adaptation is performed to mitigate the interference and to guarantee QoS downlink transmissions. Our solution is able to: 1) fairly allocate resources to each macrocell zone taking into account the user distribution; 2) optimally reuse the bandwidth allocated to inner MC zones inside femtocells located in outer zones; 3) optimally determine the serving base station, subcarriers and transmitted power for downlink transmissions taking into account user locations and demands. Simulations are conducted to show a comparison of our solution with two SP approaches with and without partial bandwidth reuse incorporating user mobility.

Keywords: linear programming; OFDMA networks; macro-femtocell networks; subcarrier reuse; power control; spectrum sharing; femtocells; network throughput; QoS; quality of service; macrocells; bandwidth reuse; simulation; user mobility.

DOI: 10.1504/IJAHUC.2015.070587

International Journal of Ad Hoc and Ubiquitous Computing, 2015 Vol.19 No.3/4, pp.241 - 253

Received: 09 Nov 2013
Accepted: 28 Mar 2014

Published online: 13 Jul 2015 *

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