Channel state information reporting for partial bands

A method for wireless communication at a base station comprising:

• transmitting to a user equipment (UE) a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder;
• receiving channel state information comprising an indication of antenna ports and linear combination coefficients for each partial band of the one or more partial bands based at least in part on transmitting the configuration message and the channel state measurement;
• and
• communicating with the UE based at least in part on receiving the channel state information for each partial band of the one or more partial bands.

An apparatus for wireless communication at a user equipment (UE), comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• receive from a base station a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder;
• select one or more antenna ports for each partial band of the one or more partial bands based at least in part on the configuration message;
• calculate channel state information comprising a linear combination of the selected one or more antenna ports for each partial band, based at least in part on receiving the configuration message;
• and
• transmit the channel state information comprising at least an indication of the selected antenna ports and linear combination coefficients for each partial band of the one or more partial bands.

An apparatus for wireless communication at a base station comprising, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor to cause the apparatus to:
• transmit to a user equipment (UE) a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder;
• receive channel state information comprising an indication of antenna ports and linear combination coefficients for each partial band of the one or more partial bands based at least in part on transmitting the configuration message and the channel state measurement;
• and
• communicate with the UE based at least in part on receiving the channel state information for each partial band of the one or more partial bands.

An apparatus for wireless communication at a user equipment (UE), comprising:

• means for receiving from a base station a configuration message comprising an indication of one or more partial bands for channel state information reporting, wherein each partial band of the one or more partial bands is less than a system bandwidth and comprises a plurality of frequency domain units associated with a precoder;
• means for selecting one or more antenna ports for each partial band of the one or more partial bands based at least in part on the configuration message;
• means for calculating channel state information comprising a linear combination of the selected one or more antenna ports for each partial band, based at least in part on receiving the configuration message;
• and
• means for transmitting the channel state information comprising at least an indication of the selected antenna ports and linear combination coefficients for each partial band of the one or more partial bands.