Effects of different algorithms, number of users and frequency channel allocation on fractional frequency reuse performance

The increase of wireless devices increases the demand for data throughput, which requires mobile operators to reduce inter-cell interference to build ultra-dense network. Fractional frequency reuse is a widely used frequency allocation method, which can reduce inter-cell interference. In this paper, four different frequency allocation algorithms of integer frequency reuse (IFR), simultaneous water filling (SWF), transmit interference temperature limit (tx-ITL) and forward-looking game (FLG) are adopted for the edge area in FFR under 19-cell network. By calculating the capacity of different systems, the performance of different algorithms applied to edge area is compared. It is concluded that when these four algorithms are applied to edge area, the order of performance from good to bad is FLG > tx-ITL = SWF > IFRN. In addition, this paper also studies the impact of the average number of cell users on the system capacity. It is found that the average number of users can increase the system capacity to a certain extent, but it will bring some hidden dangers at the same time. Finally, in the FFR system, the research on the ratio of the number of internal frequency channels to the system performance is also included. Some suggestions on the allocation of frequency channels in the inner and outer regions are also put forward. These works may provide some help for the research on how to improve the capacity of cellular mobile communication system.