Frequency Planning Scheme Based on Interference Coordination for OFDM-Relay Systems

A novel intra-cell frequency planning scheme based on interference coordination is exploited for cellular Orthogonal Frequency Division Multiplexing (OFDM)-Relay systems. In this strategy, a factor R_I is introduced to model the interference in the 2^nd slot. According to R_I and the signal-to-interference-plus-noise ratio, the scheduler groups all the users into three sets. Furthermore, the total spectrum in the 2^nd slot is divided into three parts based on the size of user sets, so that the frequency recourses in access links are reused properly. Simulation results show that the proposed method enhances the system performance in terms of both system capacity and cell edge users´ SINR, with low overheads and computational complexity.