Modified RRP scheme for interference management in OFDMA based heterogeneous networks

In Orthogonal Frequency Division Multiple Access based cellular networks, deployment of femtocell is one of the promising developments that can enhance the capacity and coverage of indoor users. However, the deployment of femtocells imposes severe cross-tier interference which degrades the overall system performance. This kind of interference may occur when femtocells are sharing the spectrum of macrocell in a co channel approach. Therefore, an efficient resource partitioning scheme is essential to minimize the effect of cross-tier interference in two-tier Heterogeneous Network. In this research, a Modified Region splitting based Resource Partitioning (MRRP) scheme is proposed to achieve the objective. In this scheme, the whole macrocell coverage area is divided into inner, centre and outer regions. In a cluster of three cells, the total available spectrum is divided into four sub bands. The first three sub bands are shared between inner and outer region. The fourth sub band is further divided into three sub bands which is utilized by centre region. In MRRP scheme, the unused sub band of each macrocell is assigned to femtocell in three different approaches namely static, order and random. The impact of these appproaches on the sum throughput of femtocell, average per user throughput, and total throughput is investigated. Further, the optimization of the proposed MRRP schme is achieved using Monte Carlo simulations.