Generalized Frequency Reuse Schemes for OFDMA Networks: Optimization and Comparison
2010 (English)In: IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), 2010, Piscataway, NJ, USA: IEEE , 2010Conference paper (Refereed)
Frequency reuse is a key concept for interference mitigation and thereby enhancing cell-edge performance in OFDMA networks. Two representative strategies are Fractional Frequency Reuse (FFR) and Soft Frequency Reuse (SFR). Both divide a cell into a center zone and an edge zone, and differentiate their levels of frequency reuse. Previous work on FFR and SFR has focused on networks of relatively small size with standard hexagon-shaped cells. And dividing the cell edge frequency band into three parts has been a common practice so far. However, for real-life networks, this is inadequate because of the irregular cell layout. We consider generalized FFR and SFR schemes, where the number of sub-bands is not restricted to three, and for SFR the power ratio is variable. To find optimal sub- band allocation for the generalized schemes, we present an approach based on large-scale optimization to deal with networks with irregular cell layout. The optimization process allows us to analyze the impact of the number of sub-bands and the SFR power ratio on cell-edge performance, and thereby compare the reuse schemes. We conduct experiments on large networks with realistic radio propagations and present a thorough numerical comparison.
Place, publisher, year, edition, pages
Piscataway, NJ, USA: IEEE , 2010.
, IEEEVTS Vehicular Technology Conference. Proceedings, ISSN 1550-2252
IdentifiersURN: urn:nbn:se:liu:diva-77311DOI: 10.1109/VETECS.2010.5493830ISI: 000287515900216ISBN: 978-1-4244-2518-1 (print)ISBN: 978-1-4244-2519-8 (e-ISBN)OAI: oai:DiVA.org:liu-77311DiVA: diva2:526294
IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), Taipei, Taiwan, 16-19 May 2010