Capacity improvement for heterogeneous LTE network by using Fractional Frequency Reuse method

In cellular network, it is predictable that 2/3 of calls and more 90% data services take place indoors. Because of that reasons, the User Equipment (UE) will having serious problem regarding on capacity achieving in indoors place. Due to this scenario, the femtocell is deployed in order to provide a good indoor coverage. However, deployment of femtocells pose a number of challenges and one of it is how to handle the co-channel interference. Co-channel interference occurs due to the femtocells sharing the same frequency band allocating as macrocells. To resolve this issue, a method called Fractional Frequency Reuse (FFR) is proposed in this paper in order to reduce the interferences in macrocell and femtocell hence the higher capacity network can be achieved. The method focuses on the analyzing and improving the macrocell user´s capacity and maximizes the femtocell capacity. The simulation results show that choosing the fraction of center system bandwidth and fraction of center radius becomes important since the proper resource partitioning and interference coordination can be achieved so that it can increasing the user´s capacity in network.