Simulation and analysis of interference avoidance using fractional frequency reuse (FFR) method in LTE femtocell

There for another way is needed to keep LTE reliable when use in indoor. Femtocell is the solution of the problem. But femtocell uses the same frequency spectrum as any other broadband services. The more femtocell used in an area, overall networks capacity will be disturbed by cochannel interference. There are two scenarios that were examined in this research experiment about femtocell LTE interference. That is between MBS - FUE and FBS - MUE. And then to both scenarios applied FFR method using 4 reuse frequencies, 1 frequency use in center cell and the other 3 is use in the edge cell, where the power transmit of the center cell is greater than edge cell. The using of FFR method is to decrease the interference. Parameter that being use to analyze is SINR value that observed from the user side. FFR algorithm simulated with Matlab 7.11.0 simulator to determine SINR value and to create Layout Position Model of FBS, MBS, and MUE/FUE. Simulation result shows that FFR method is able to increase SINR value in each scenarios. In Scenario 1 with random distance, where the distance between MBS - FBS is 572.503 meters, the distance between FBS - FUE is 33.8378 meters, and the distance between MBS - FUE is 541.288 meters. SINR value increased by 124.4194 dB, that is from 57.8716 dB to 182.291 dB. In scenario 2, where the distance between MBS - FBS is 604 meters, the distance between FBS - MUE is 37.5366 meters, and the distance between MBS - MUE is 641.291 meters. SINR value increased by 104.6943 dB, that is from 78.5277 dB to 183.222 dB. It shows the improvement of quality or the decrease of interference to both Macrocell User and Femtocell User after FFR method being applied.