Inter-cell interference coordination with adaptive frequency-reuse for VoIP and data traffic in downlink of 3GPP-LTE

One of the most important challenges is how to manage inter-cell interference. Special care has to be taken regarding voice traffic which has more strict requirements on delay and packet loss. The goal of inter-cell interference coordination schemes is to decrease inter-cell interference and get higher cell throughput, so we evaluated the performance of inter-cell interference coordination schemes containing reuse-one, reuse-three, reuse-one with power-planning, Soft frequency reuse and Fractional frequency reuse schemes. With considering high traffic load the best option regarding to the cell throughput what can be seen is the Fractional reuse with b=0.7 (b, percentage of reduced power sub-band). In the second step for interference control, adaptive reuse is proposed. The frequency reuse of the system can be changed in function of the proportion of voice users. When two traffic types are present at the same time reuse-one and reuse-three are the best schemes for data and voice, respectively. However the best scheme in performance for one traffic type is the worst for the other in general. The proposed algorithm gives a performance between reuse-one and reuse-three.