US Patent 10193605 Beamforming codeword exchange between base stations

Methods, apparatus, and systems for wireless communications are disclosed. A first base station may be configured to receive, from a second base station, one or more messages. The messages may include downlink beamforming information elements for a downlink cell. Each downlink beamforming information element of the plurality of downlink beamforming information elements may be associated with a respective resource block of a plurality of resource blocks in the downlink cell. The first base station may select a first beamforming codeword for at least one resource block of the plurality of resource blocks based on the downlink beamforming information associated with the at least one resource block. The first base station may transmit, to a wireless device, signals on the at least one resource block employing the first beamforming codeword.