Configurations for channel state feedback

A method of wireless communication performed by a device, comprising:

• receiving a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel;
• and
• transmitting a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel,
• wherein the CSI feedback configuration indicates a first number of delay taps to be used for channel compression corresponding to the CSF and a second number of delay taps to be used for channel compression corresponding to the differential CSF.

A device for wireless communication, comprising:

• one or more memories;
• and one or more processors, coupled to the one or more memories, configured to cause the device to:
• receive a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, a channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel;
• transmit a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel,
• wherein the one or more processors are further configured to cause the device to:
• receive an indication of a number of bits for the differential CSF, wherein the number of bits for the differential CSF is based at least in part on a determination that a first set of antenna ports associated with a first CSI reference signal (CSI-RS) and a second set of antenna ports associated with a second CSI-RS are not quasi co-located.

A device for wireless communication, comprising:

• one or more memories;
• and one or more processors, coupled to the one or more memories, configured to cause the device to:
• receive a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel;
• and
• transmit a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel,
• wherein the CSI feedback configuration indicates a first number of delay taps to be used for channel compression corresponding to the CSF and a second number of delay taps to be used for channel compression corresponding to the differential CSF.