In order to suppress cross-tier interference (CTI) and
inter-cell interference (ICI) between adjacent macrocells, this
paper proposes an effective resource allocation scheme for the
two-tier OFDMA femtocell networks, in which macro BSs adopt
the soft frequency reuse (SFR) strategy. Consider that macrocell
users (MUEs) are prior to femtocell users (FUEs), firstly the subbands
are allocated to MUEs utilizing SFR for the ICI mitigation,
based on which the sub-bands are efficiently allocated to
femocells for CTI mitigation. The proposed scheme is optimized
in terms of energy efficiency, while guarantees that both MUEs
and FUEs attain at least a given data rate, especially for cell-edge
MUEs. With a three dimensional two-tier femtocell network
model and practical LTE parameters, simulation results show
that the proposed scheme rivals other two prominent related
schemes on the CTI and ICI suppression, while outperforms
them on energy efficiency for wireless overlay networks.