An Uplink Analytical Model for Two-Tiered 3G Femtocell Networks

Abstract—This paper proposes an analytical model to investigate
the impact of interference on the uplink capacity and
coverage in a WCDMA network where macrocell and femtocells
co-exist. Geometric modeling for the hierarchical system is used
where the randomly deployed femtocells are within the planned
macrocells’ topology. The interference effects among femtocells
and between femtocells and macrocells are studied analytically
to quantify the system capacity and coverage based on the
practical target signal-to-interference ratio (SIR). Interference
level splitting results show that the macrocell attached User
Equipment (UE) to Home Node B (HNB) interference has severe
impact on the capacity and coverage of femtocell network.
Further study suggests that advanced receivers which cancel
interference at the femtocell could minimize the effect brought
by different interferences in a cost-effective manner.