It has been predicted that the total mobile traffic in the
world will have a ten-fold growth from 2011 to 2016. Moreover, it
is estimated that over 80% of the mobile traffic is generated
indoors. Massive indoor femtocells are expected to be set up for
offloading indoor users from outdoor macrocells and to provide
huge capacity to meet high data demands. However, inter-cell
interference between femtocells is one of the major challenges in
indoor deployments and needs to be addressed in the network
planning phase. In this paper, interference mitigation schemes
for indoor dense deployment of femtocells are investigated, and a
cooperative transmission scheme and a semi-static interference
mitigation scheme based on fractional frequency reuse (FFR) are
developed for dense femtocell networks. Extensive simulations
using a dedicated indoor network planning and optimization tool,
iBuildNet®, are carried out to evaluate the proposed schemes.
Simulation results show that the proposed schemes are able to
yield significant gains in terms of average throughput.