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Enhanced Inter-Cell Interference Coordination (eICIC) is a proposed framework by the 3GPP to handle Inter-Cell Interference (ICI) in Heterogeneous Network (HetNet) environments. Almost-Blank Sub-Frame (ABSF) is one of the time-domain techniques proposed in the eICIC framework as a candidate for deployment in LTE release 10 (LTE-Advanced). In this paper, a comprehensive ABSF framework is proposed to mitigate the interference in HetNet environments comprised of macro-cells and femto-cells. The ABSF framework proposes a tracking procedure to mark and unmark the macro-cell victim users. Also, new control message to coordinate between macro-cells and femto-cells is proposed, a novel approach to trigger the ABSF mode at aggressor Home eNBs (HeNBs), and enhancements to the macro-cell scheduling process.
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