Base Station Cooperation for Interference Coordination by Sharing Large Scale SIR

In the Orthogonal Frequency Division Multiple Access (OFDMA) cellular mobile communication systems, Inter-cell interference (ICI) become the main factor in affecting system performance. Coordinated Multipoint (CoMP) is one of the key technologies in deal with the interference coordination. In downlink coordinated multi-point transmission systems, base-stations (BS) adopt tri-sector antenna divide the cell into three fan sectors so that the interference between the neighborhood cellulars can be greatly dispelled. Base-stations computes the large scale signal to interference ratio(SIR) for the served users, and cell match its users with ones in the other cells according to certain rules by sharing the large scale SIR information. It realizes a trade-off of SIR between the users in the center of the cellular and users on the edge of the cellular, in order to solve the low SINR problem which due to the ICI at cell edge. Simulation results show that the proposed algorithm significantly improves cell edge SINR and throughput with less feedback overhead.