Method, apparatus for channel state information feedback and storage medium

A method for wireless communication, comprising:

• performing, by a terminal, a channel measurement according to a reference signal from a base station;
• selecting, by the terminal, M subbands from K subbands of a Channel State Information (CSI) reporting band for providing CSI feedback, wherein M and K are integers greater than or equal to 1, wherein M<K, and wherein the M subbands are in a comb-shaped distribution in the K subbands;
• and
• reporting, by the terminal to the base station, a phase coefficient indicator corresponding to the M subbands, wherein the phase coefficient indicator is associated with a precoding codebook index, and wherein each subband includes a set of R resource blocks (RBs), R being an integer greater than or equal to 1.

A device for wireless communication, comprising:

• a processor;
• and
• a memory including processor executable code, wherein the processor executable code upon execution by the processor configures the processor to:
• perform a channel measurement according to a reference signal from a base station;
• select M subbands from K subbands of a Channel State Information (CSI) reporting band for providing CSI feedback, wherein M and K are integers greater than or equal to 1, wherein M<K, and wherein the M subbands are in a comb-shaped distribution in the K subbands;
• and
• report, to the base station, a phase coefficient indicator corresponding to the M subbands, wherein the phase coefficient indicator is associated with a precoding codebook index,
• wherein each subband includes a set of R resource blocks (RBs), R being an integer greater than or equal to 1.

A device for wireless communication, comprising:

• a processor;
• and
• a memory including processor executable code, wherein the processor executable code upon execution by the processor configures the processor to:
• transmit a reference signal to a terminal for performing a channel measurement;
• and
• receive, from the terminal, a phase coefficient indicator corresponding to M subbands, wherein the phase coefficient indicator is associated with a precoding codebook index, wherein the M subbands are selected from K subbands of a CSI reporting band, M and K being integers greater than or equal to 1 and M<K, wherein the M subbands are in a comb-shaped distribution in the K subbands, and wherein each subband includes a set of R resource blocks (RBs), R being an integer greater than or equal to 1.

A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions configured to execute a method that comprises:

• performing, by a terminal, a channel measurement according to a reference signal from a base station;
• selecting, by the terminal, M subbands from K subbands of a Channel State Information (CSI) reporting band for providing CSI feedback, wherein M and K are integers greater than or equal to 1, wherein M<K, and wherein the M subbands are in a comb-shaped distribution in the K subbands;
• and
• reporting, by the terminal to the base station, a phase coefficient indicator corresponding to the M subbands, wherein the phase coefficient indicator is associated with a precoding codebook index, and wherein each subband includes a set of R resource blocks (RBs), R being an integer greater than or equal to 1.