Analysis and Simulation FFR in Improving 4G Network

Younes Safari Sefid chaghaei¹ hamed moradi²

1) BSc Computer Azad University
2) University of Electronic Science and Research M.Sc.

Publication : The 5th International conference of Sciences and Engineering(5icesconf.com)
Abstract :
In the Paper, The need to provide quality indoor coverage for mobile network users in an indoor environment has become paramount to communication service providers. Femto-cells due to their low capital expenditure & operating expenditure have seen widespread adoption as a possible solution to the indoor coverage challenge. The major drawback of its adoption is the possibility of erratic but significant interference to both the Femto-cell and the Macro-cell tiers owing to their Ad-hoc mode of deployment. The Fractional Frequency Reuse (FFR) is an interference mitigation scheme, due to its effectiveness and low complexity; it has been proposed to be an efficient technique of solving the problem of interference in the cross-boundary region. In this study, a critical analysis of the existing schemes revealed that Femto-cell users at the border between the cell centre region and the cell edge region suffer cross-boundary interference. An algorithm that integrates a buffer zone between the existing CCR and CER has been developed to solve the cross-boundary interference challenge experienced by the Femto-cell users. A system level simulation implemented in MATLAB was used to evaluate the developed algorithm. In terms of the SINR, the performance improvement recorded for Femto-cell users at the border region after the implementation of the buffer zone was more than eighty per cent (80%). There were significant improvements in terms of the channel capacity and throughput for the Femto-users present at the buffer region with the implementation of the developed algorithm.
Keywords : 4G – LTE – FFT – OFDM - DFT