Analysis and Optimization of Multi-layer FFR Designs in Multi-cellular OFDMA Networks

Abstract:

In OFDMA networks, the use of universal frequency reuse plans improves overall cell capacity at the cost of very high levels of inter-cell interference (ICI) at the users typically located in the cell-edge regions. In order to mitigate ICI while achieving high spectral efficiencies, fractional frequency reuse (FFR) shows a good tradeoff between cell-edge throughput and overall cell spectral efficiency. Recently, multi-layer FFR-aided OFDMA-based designs, splitting the cell into inner, middle and outer layers have been proposed and studied with the aim of increasing the spectrum utilization and improving the user fairness throughout the cell. Accordingly, an analytical framework allowing the performance evaluation and optimization of a multi-layer FFR-aided OFDMA-based networks is presented. Tractable mathematical expressions of the average cell spectral efficiency as well as the layers' edge spatial throughput have been derived for both proportional fair (PF) and round robin (RR) scheduling policies. Moreover, different optimization problems have been proposed, applying the benchmark two-layer FFR and a four-layer FFR scheme, allowing a tradeoff between throughput and fairness by suitably dimensioning the cell layers.

Biography:

Jan García Morales was born in 1984 in Cienfuegos (Cuba). In 2008 he graduated with a degree in Telecommunications and Electronic from the Faculty of Electrical Engineering, Central University of Las Villas (www.uclv.edu.cu), Villa Clara, Cuba.

He worked at the Mobile Telecommunications Company  MOVITEL S.A. (www.movitel.co.cu) from September 2008 to August 2012. Motivated by the research in the telecommunications and information technology area, he applied for one of the Santander-Iberoamerica scholarship in 2012 to study the Master Degree (research itinerary) in Spain.

In July 2013 he obtained the Master of Science in Information Technologies from the Department of Mathematical and Information, University of the Balearic Islands (www.uib.es). Upon completion of the MSc, he stayed at Innovation and Technology Company  IBITEC S.L. (www.ibitec.es) as a Santander-Crue-Cepyme Internship researcher assistant conducting work on designing and programming automatic systems and sensor networks.

In December 2013 he obtained a pre-doctorate scholarship under project AM3DIO (TEC2011-25446), and in part by the Conselleria d’Educació, Cultura i Universitats (Govern de les Illes Balears) under grant FPI/1538/2013 as part of an operational program co-financed by the European Social Fund. Since 2013 he is a PhD student of the Doctoral Degree in Information and Communication Technologies from the Higher Polytechnic School of the University of the Balearic Islands, member of the Mobile Communications Group (mcg.uib.es) and IEEE-student member (No. 93309916).

He is currently working on his thesis project: "Heterogeneous multi-tier networks, towards ubiquitous multimedia content distribution", and under the group research line: "Resource management in mobile communications networks".