Performance analysis of two-tier cellular network using power control and cooperation

Abstract

Femtocell deployment improves the data rate and indoor coverage of the heterogeneous cellular network (HCN). However, it also increases the cross-tier interference of the system which results in performance degradation of the macro base station (MBS) tier. In this work, a mathematical framework is developed to mitigate the cross-tier interference of MBS tier using a power control scheme (PCS). This PCS works on path loss inversion and location-based power level rule for femto base stations (FBS) to improve the coverage of the MBS tier. Furthermore, a cooperation scheme and association policy are proposed to improve the performance of the FBS tier. Stochastic geometry is considered for deriving the signal to interference and noise ratio (SINR) outage probability, total outage probability, and area spectral efficiency (ASE) for MBS and FBS tiers. The impact of the PCS, proposed cooperation scheme with association policy on outage probability, and ASE are numerically evaluated. Numerical results show that considerable improvement in outage performance of MBS tier is obtained using proposed PCS. Moreover, applying PCS results in degradation of outage performance of FBS tier. This loss in performance can be compensated by using the proposed cooperation scheme and association policy.