Resource allocation for relay-assisted OFDMA systems using inter-cell interference coordination

This article proposes a new enhanced fractional frequency reuse (FFR) scheme to improve the system performance in multi-cell orthogonal frequency division multiple access system, which tackles the problems of frequency distribution and inter-cell interference (ICI) by jointly FFR and ICI coordinatio...

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Bibliographic Details
Published in:	EURASIP journal on wireless communications and networking 2012-05, Vol.2012 (1), p.1-10, Article 156
Main Authors:	Zhang, Hongtao, Wang, Xiaoxiang, Liu, Yang, Zheng, LZ, Bohnert, Thomas Michael
Format:	Article
Language:	eng
Subjects:	Algorithms Allocations Communications Engineering Dynamical systems Dynamics Engineering Information Systems Applications (incl.Internet) Interference Networks Resource allocation Signal,Image and Speech Processing Spectra Subcarriers
Online Access:	Get full text
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Summary:	This article proposes a new enhanced fractional frequency reuse (FFR) scheme to improve the system performance in multi-cell orthogonal frequency division multiple access system, which tackles the problems of frequency distribution and inter-cell interference (ICI) by jointly FFR and ICI coordination. The proposed scheme dynamically assigns subcarriers to center and edge groups depending on load conditions and the channel state information by two algorithms. The center allocation algorithm assigns subcarriers to center users from different directions. The edge allocation algorithm allows the highly loaded sectors to borrow the remaining subcarriers from center band or other sectors considering the fairness requirements of all the users. Simulation results illustrate that the proposed scheme can outperform the traditional schemes by achieving higher throughputs and better spectral efficiency especially in highly loaded cells.
ISSN:	1687-1499 1687-1472 1687-1499