Distributed FFR as the novelty solution of the integration Femtocell and macrocell in cellular network

LTE-Advanced and Femtocell are deployed by cellular operators to improve the coverage and capacity to respond the demand for higher data rates in wireless networks. Integration of femtocell into cellular network faced interference between femtocell and macrocell. Several scenarios based on Fractional Frequency Reuse (FFR) methods have been proposed to mitigate this interference, including integer fractional fraction reuse (FFR), soft frequency reuse (SFR), frequency frequency reuse orde-3 (FFR-3) and optimal static fractional frequency reuse (OSFFR). The study proposes Distributed Fractional Frequency Reuse scenario to mitigate interference and improve performance simultaneously. Distributed fractional Frequency reuse (DFFR) is an improvement of OSFFR by allocating sub-bands proportional and it is reused for each sector.