User equipment transmit/receive calibration in time division duplexing using assistance information

A user equipment (UE) for wireless communication, comprising:

• one or more antennas;
• and
• a processing system that includes one or more processors and one or more memories that store code for the one or more processors, the processing system configured to cause the UE to:
• receive, from an assisting node, assistance information that relates to a transmit/receive (Tx/Rx) mismatch associated with the UE;
• obtain one or more Tx/Rx imbalance values associated with the UE in accordance with the assistance information received from the assisting node, wherein the assistance information is carried in a medium access control (MAC) control element (MAC-CE) or a protocol data unit (PDU) that has a header associated with calibrating the one or more Tx/Rx imbalance values;
• estimate an effective uplink channel in accordance with a downlink channel estimate associated with a downlink reference signal and in accordance with the one or more Tx/Rx imbalance values associated with the UE;
• and
• transmit an uplink communication using a precoder associated with the estimated effective uplink channel.

A method for wireless communication by a user equipment (UE), comprising:

• receiving, from an assisting node, a first channel state information reference signal (CSI-RS);
• transmitting, to the assisting node, feedback that indicates the first CSI-RS or an estimate of an effective downlink channel associated with the first CSI-RS;
• transmitting, to the assisting node, a sounding reference signal (SRS) including one or more first transmit/receive (Tx/Rx) imbalance values that relates to a Tx/Rx mismatch associated with the UE and is in accordance with the feedback;
• receiving, from the assisting node, one or more second Tx/Rx imbalance values;
• receiving, from the assisting node, a second CSI-RS;
• estimating an effective uplink channel in accordance with a downlink channel estimate associated with the second CSI-RS and in accordance with the one or more second Tx/Rx imbalance values;
• and
• transmitting an uplink communication using a precoder associated with the estimated effective uplink channel.

A method for wireless communication by a user equipment (UE), comprising:

• receiving, from an assisting node, assistance information that relates to a transmit/receive (Tx/Rx) mismatch associated with the UE;
• obtaining one or more Tx/Rx imbalance values associated with the UE in accordance with the assistance information received from the assisting node, wherein the assistance information is carried in a medium access control (MAC) control element (MAC-CE) or a protocol data unit (PDU) that has a header associated with calibrating the one or more Tx/Rx imbalance values;
• estimating an effective uplink channel in accordance with a downlink channel estimate associated with a downlink reference signal and in accordance with the one or more Tx/Rx imbalance values associated with the UE;
• and
• transmitting an uplink communication using a precoder associated with the estimated effective uplink channel.