Patent ID: 9215755
Filing Date: 2015-12-15
Classification: H04W

Abstract:
1. A base station for a cellular communications network, comprising: at least one antenna system which comprises a plurality of antenna elements, wherein at least two antenna elements are arranged at different vertical positions with reference to a virtual horizontal plane; and a controller configured to control the at least one antenna system to transmit specific pilot signals on orthogonal radio resources associated with said specific pilot signals via different ones of said at least two antenna elements arranged at different vertical positions, wherein said controller is configured to receive feedback information from a terminal via the at least one antenna system, wherein said feedback information depends on or characterizes a phase shift between said pilot signals as detected by said terminal, wherein the controller is configured to control a tilt angle of the at least two antenna elements arranged at different vertical positions for at least one of downlink transmissions to said terminal and receipt of uplink transmissions from the terminal depending on said feedback information.