Beamforming in non-reciprocal uplink and downlink channels

A method of wireless communication, comprising:

• communicating, by a base station (BS) with a user equipment (UE), uplink-downlink (UL-DL) beam reciprocity information;
• transmitting, by the BS to the UE, a plurality of downlink (DL) beam reference signals based on a beam selection for a beam weight adjustment;
• receiving, by the BS from the UE via an antenna array of the BS, an uplink (UL) reference signal beamformed based on the beam weight adjustment and the UL-DL beam reciprocity information;
• adjusting, by the BS, a plurality of weights for the antenna array based on the UL reference signal;
• and
• transmitting, by the BS to the UE, a DL communication signal using a transmission beam configured based on the adjusted plurality of weights.

A user equipment (UE) comprising:

• a transmitter of the UE configured to transmit uplink-downlink (UL-DL) beam reciprocity information;
• a receiver of the UE configured to receive via an antenna array of the UE, a plurality of downlink (DL) beam reference signals based on a beam selection and further configured to receive a DL communication signal using a reception beam configured based on an adjusted plurality of weights;
• and
• a processor of the UE configured to adjust a plurality of weights for the antenna array based on the received plurality of DL beam reference signals and the UL-DL beam reciprocity information.

A base station (BS) comprising:

• a transmitter of the BS configured to transmit uplink-downlink (UL-DL) beam reciprocity information, further configured to transmit a plurality of downlink (DL) beam reference signals based on a beam selection for a beam weight adjustment, and further configured to transmit a DL communication signal using a transmission beam configured based on an adjusted plurality of weights;
• a receiver of the BS configured to receive an uplink (UL) reference signal beamformed based on the beam weight adjustment and the UL-DL beam reciprocity information;
• and
• a processor of the BS configured to adjust a plurality of weights for an antenna array based on the UL reference signal.