Generalizing FFR by Flexible Sub-Band Allocation in OFDMA Networks with Irregular Cell Layout
2010 (English)In: IEEE Wireless Communications and Networking Conference Workshops (WCNCW), 2010, IEEE , 2010Conference paper (Refereed)
Fractional Frequency Reuse (FFR) is one of the key concepts for enhancing cell-edge performance of OFDMA networks. Standard FFR allows one sub-band to be allocated for each cell. This limits the performance improvement of cell edge users, especially those bandwidth-sensitive users. With flexible sub-band allocation, cell edge can be allocated more than one sub-band, thereby performance can be improved largely. Furthermore, previous work on FFR has focused on networks of relatively small size and with standard hexagon- shaped cells.For real-life networks with a very irregular cell layout, these results are inadequate. In this paper, we present the idea of Flexible FFR (FFR-F) which allows more than one sub-band to be allocated to cell edges. Meanwhile, an optimization algorithm based on local search is present for FFR-F planning in large-scale networks with irregular cell layout. Sub-band allocation scheme which maximizes the cell-edge throughput can be found time efficiently. Results from networks with realistic radio propagation conditions show that FFR-F enables significant throughput improvement at cell edges. These results along with the analysis demonstrate the potential benefits of FFR-F and the proposed approach for planning of real-life OFDMA networks.
Place, publisher, year, edition, pages
IEEE , 2010.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-89602DOI: 10.1109/WCNCW.2010.5487661ISBN: 978-1-4244-6405-0ISBN: e-978-1-4244-6406-7OAI: oai:DiVA.org:liu-89602DiVA: diva2:608459
IEEE Wireless Communications and Networking Conference (WCNCW 2010), 18 April 2010, Sydney, NSW, Australia