Inter‐cell interference mitigation based on joint beamforming

Abstract

SUMMARYIn cellular networks, global channel state information (CSI) shall be shared among neighboring cells to mitigate various inter-cell interference (ICI). In this paper, we propose that comparable ICI is mitigated while weak ICI is treated as noise. The amount of shared CSI is highly reduced, because of that only the CSI corresponding to comparable ICI is shared among neighboring cells. In the case of single user equipment in each cell, a joint singular value decomposition and interference alignment method is proposed along with the analysis of its approximate sum rate. Some nodes select singular value decomposition method, while others choose interference alignment method. The method at each node is determined by global selection principle or user classification principle. In the case of multiple UEs in each cell, all nodes utilize minimum mean square error method, but ICI is neglected at cell center users.

Performance analysis of ultra‐dense networks with MRC reception and successive interference cancellation under rate‐limited backhaul

“…Ultra-dense network (UDN) is considered to be a promising solution to improve network throughput of future radio access networks [1][2][3]. As the cellular BSs are more densely deployed, the interference is much stronger than that in conventional systems [4].…”