Cooperative interference management by beam tilt and power controls in an indoor multi-cell environment

The increase number of wireless LAN devices is worsening inter-cell interference (ICI). Although techniques that cooperatively mitigate the ICI by digital processing beamforming have been investigated, the demands for frequency and timing synchronicity between cells are impractical. This paper proposes cooperative interference management with analog control of beam tilt and power. In this proposal, multiple each access points cooperatively transmits to own desired station by setting beam tilt angles so as to maximize sum-rate. The effectiveness of the proposed technique is clarified by ray-tracing simulations of sum-rate in an indoor multi-cell environment.