Enhanced Fractional Frequency Reuse to Increase Capacity of OFDMA Systems

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Inter-Cell Interference (ICI) mitigation is always a big challenge issue in cellular systems. In this paper, the authors propose an Enhanced Fractional Frequency Reuse (EFFR) scheme combined with power allocation and an interference-aware reuse mechanism to achieve not only ICI limitation at cell edge but also enhancement of overall cell capacity in Orthogonal Frequency Division Multiple Access (OFDMA) based communication networks. The EFFR scheme divides the whole available bandwidth into a primary segment and a secondary segment. The exclusive reuse-3 sub-channels in the primary segment will be prior used by cell-edge users with higher transmission power, whereas the remaining sub-channels are all reuse-1 sub-channels allowing to be used with lower power.