A Novel Downlink Coordination Scheme for CoMP SU-MIMO

Coordinated multiple point transmission/reception (CoMP) is considered as an effective approach for inter-cell interference coordination (ICIC) in LTE-A, which can improve cell-edge and average cell throughputs. In this paper, a novel downlink coordination scheme consisting of two steps was proposed for CoMP single-user multi-input multi-output (CoMP SU-MIMO). Firstly, combining the conventional network-defined method with UE-specific one, we proposed a CoMP Cooperation Set (CCS) selection method which could provide most of the achievable throughput gain with lower complexity. Secondly, a resource allocation scheme was provided for the coordination among overlapping CCSs, by inheriting the idea of fair treatment for cell-center users and cell-edge users and conquering the limitation of the conventional schemes which could be only used for non-overlapping CCS method. Simulation results show that the proposed scheme could increase the system throughput significantly as well as improve the fairness between cell-center users and cell-edge users compared with the existing schemes.