Beamforming in wireless communications

A first transmission point comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the first transmission point to:
• receive, from a second transmission point:
• a first downlink beamforming information element associated with a first group of resources of a cell;
• and
• a second downlink beamforming information element associated with a second group of resources of the cell, wherein second group of resources is different from the first group of resources;
• and
• transmit, to a wireless device, signals, via the first group of resources, using a first beamforming codeword selected, from a codebook, based on the first downlink beamforming information element.

A non-transitory computer-readable medium storing instructions that, when executed, configure a first transmission point to:

• receive, from a second transmission point:
• a first downlink beamforming information element associated with a first group of resources of a cell;
• and
• a second downlink beamforming information element associated with a second group of resources of the cell, wherein second group of resources is different from the first group of resources;
• and
• transmit, to a wireless device, signals, via the first group of resources, using a first beamforming codeword selected, from a codebook, based on the first downlink beamforming information element.

A system comprising:

• a wireless device;
• a first transmission point;
• and
• a second transmission point,
• wherein the first transmission point is configured to:
• receive, from the second transmission point:
• a first downlink beamforming information element associated with a first group of resources of a cell;
• and
• a second downlink beamforming information element associated with a second group of resources of the cell, wherein second group of resources is different from the first group of resources;
• and
• transmit, to the wireless device, signals, via the first group of resources, using a first beamforming codeword selected, from a codebook, based on the first downlink beamforming information element;
• and
• wherein the second transmission point is configured to transmit, to the first transmission point, one or more messages comprising the first downlink beamforming information element and the second downlink beamforming information element.

A system comprising:

• a wireless device;
• a first transmission point;
• and
• a second transmission point,
• wherein the first transmission point is configured to:
• receive, from the second transmission point:
• a first downlink beamforming information element associated with a first group of resources of a cell;
• and
• a second downlink beamforming information element associated with a second group of resources of the cell, wherein second group of resources is different from the first group of resources;
• and
• transmit, to the wireless device, signals, via the first group of resources, using a first beamforming codeword selected, from a codebook, based on the first downlink beamforming information element;
• and
• wherein the wireless device is configured to receive the signals transmitted using the first beamforming codeword.