Scheduling Based Controllable Interference Coordination in OFDMA Systems

OFDMA system with frequency re-use of 1 suffers from poor cell edge performance because of serious inter-cell interference in both downlink and uplink. In this paper, a novel method called scheduling based controllable interference coordination (SBCIC) which adapts to different system load distribution and its variation is proposed to mitigate inter-cell interference and hence increases SIR at cell edge. Simulation results show that performance at the cell edge is much improved and that of cell center is also improved in some extent with the proposed method in OFDMA system, but these improvements are not limited by the inter-cell and/or intra-cell load variation, which is very important to meet future wireless communication system´s requirements. Also, reduced signalling overhead will improve system efficiency. Furthermore, the proposed method can also improve real-time service support with fast efficient HARQ mechanism because of simplified RAN architecture and protocols compared with macro diversity.