Fractional Frequency Reuse (FFR) and FFR-Based Scheduling in OFDMA Systems

To reduce frequency reuse scheme for orthogonal frequency division multiple access (OFDMA) systems, an algorithm based on Cantor Set Theory is introduced. Four fractional frequency reuse (FFR) schemes, improving cell-edge user´s performance are derived. A low complexity scheduling algorithm is proposed based on these schemes. This FFR-based scheduling algorithm selects user for transmission according to mapping in FFR and scheduling policy. Performance of FFR as well as FFR-based scheduling is analyzed via simulations. The results demonstrate that, FFR(III) has highest user throughput among four schemes. Furthermore, FFR(III) outperforms other schemes in cell-edge user throughput for 8/9 reuse and is the most robust scheme.