Channel information feedback method and communication apparatus

A communication apparatus, comprising:

• at least one processor;
• at least one memory configured to store a computer program that, when executed by the at least one processor, causes the communication apparatus to perform at least following operations:
• receiving first indication information, wherein the first indication information indicates a first frequency domain discrete Fourier transform (DFT) vector set, a subset of the first frequency domain DFT vector set comprises a second frequency domain DFT vector set, and the second frequency domain DFT vector set and channel state information reference signal (CSI-RS) ports selected by the communication apparatus correspond to a first space-frequency vector set;
• determining a strongest coefficient indicator (SCI) based on the first indication information, wherein the SCI indicates a space-frequency vector corresponding to a strongest coefficient in the first space-frequency vector set;
• and
• sending uplink control information (UCI), wherein the UCI comprises first information and the SCI, the first information indicates the second frequency domain DFT vector set, and the first information and the SCI have a same priority in the UCI.

A non-transitory computer-readable storage medium storing computer instructions, that when executed by at least one processor, cause the at least one processor to perform at least following operations:

• receiving, by a terminal device, first indication information, wherein the first indication information indicates a first frequency domain discrete Fourier transform (DRT) vector set, the first frequency domain DFT vector set comprises a second frequency domain DFT vector set, and the second frequency domain DFT vector set and channel state information reference signal (CSI-RS) ports selected by the terminal device correspond to a first space-frequency vector set;
• determining, by the terminal device, a strongest coefficient indicator (SCI) based on the first indication information, wherein the SCI indicates a space-frequency vector corresponding to a strongest coefficient in the first space-frequency vector set;
• and
• sending, by the terminal device, uplink control information (UCI), wherein the UCI comprises first information and the SCI, the first information indicates the second frequency domain DFT vector set, and the first information and the SCI have a same priority in the UCI.

A communications chip comprising at least one processor, wherein the at least one processor is coupled with at least one memory that stores computer instructions, that when executed by the at least one processor, cause the communications chip to perform at least following operations:

• receiving first indication information, wherein the first indication information indicates a first frequency domain discrete Fourier transform (DFT) vector set, a subset of the first frequency domain DFT vector set comprises a second frequency domain DFT vector set, and the second frequency domain DFT vector set and channel state information reference signal (CSI-RS) ports selected by the communication apparatus correspond to a first space-frequency vector set;
• determining a strongest coefficient indicator (SCI) based on the first indication information, wherein the SCI indicates a space-frequency vector corresponding to a strongest coefficient in the first space-frequency vector set;
• and
• sending uplink control information (UCI), wherein the UCI comprises first information and the SCI, the first information indicates the second frequency domain DFT vector set, and the first information and the SCI have a same priority in the UCI.