Enhanced Dynamic Inter-cell Interference Coordination Schemes for LTE-Advanced

In LTE-Advanced, macro-pico heterogeneous networks (HetNet) are extensively discussed. Cell range expansion (CRE) and inter-cell interference coordination (ICIC) are introduced to improve the HetNet system performance. In this paper, semi-static ICIC and dynamic ICIC methods are discussed, and the problems facing conventional dynamic ICIC methods are analyzed and investigated. Joint decision and multiple feedback schemes are proposed to enhance the system performance through appropriate selection of normal/mute transmitting status and accurate scheduling for dynamic ICIC. Simulation results show that the proposed schemes achieve better average system performance and edge user performance than the semi-static ICIC and conventional dynamic ICIC methods, even when a reduced feedback method is used in the proposed schemes. The performance gain is as high as 9% for the average throughput and 30% for the edge user throughput with a proper bias and muting ratio.