CSI feedback and receiving methods, apparatus, device, and storage medium
Provided are CSI feedback and receiving methods, apparatuses, a device, and a storage medium. The method includes: a terminal determines PMI, the PMI includes at least one of: first base vector information, second base vector information, second coefficient amplitude information or phase information; for one transmission layer, a frequency domain resource in one preset frequency domain unit corresponds to one precoding vector, the precoding vector is a linear combination of first base vectors, and weighting coefficients used in the linear combination of the first base vectors are first coefficients; on multiple frequency domain units contained in a CSI feedback band, a vector composed of first coefficients corresponding to a same first base vector is a linear combination of second base vectors, and weighting coefficients used in the linear combination of the second base vectors are second coefficients; and the terminal feeds back CSI containing the PMI to a base station.
1. A channel state information (CSI) feedback method, comprising:
determining, by a terminal, precoding matrix indication information (PMI), wherein:
the PMI comprises:
first base vector information associated with first base vectors;
second base vector information associated with second base vectors; and
second coefficient information, used to derive first coefficients and second coefficients, the second coefficient information comprising second coefficient amplitude information and second coefficient phase information;
a CSI feedback band comprises a plurality of frequency domain units, each frequency domain unit having a plurality of frequency domain resources;
frequency domain resources in each of the plurality of frequency domain units of a same transmission layer correspond to a same precoding vector, each precoding vector being a linear combination of the first base vectors with weighting coefficients being the first coefficients; and
the first coefficients corresponding to a same first base vector define a first coefficient vector, the first coefficient vector being a linear combination of the second base vectors with weighting coefficients being the second coefficients; and
feeding back, by the terminal, CSI containing the PMI to a base station.
2. The method of claim 1 , wherein a frequency domain unit of the plurality of frequency domain units comprises at least one of: a sub-band or a first resource block (RB) set, wherein a number of RBs contained in the first RB set is less than a number of RBs contained in a sub-band of the CSI feedback band.
3. The method of claim 1 , wherein the second base vectors comprise discrete Fourier transform (DFT) vectors.
4. The method of claim 1 , wherein a dimension of each second base vector is equal to a number of frequency domain units contained in the CSI feedback band.
5. The method of claim 1 , wherein the second base vectors belong to a second base vector candidate set, the second base vector candidate set is determined based on parameter N, and the second base vector candidate set is {v 1 , . . . , v N } or a subset of {v 1 , . . . , v N }, wherein N is a number of frequency domain units contained in the CSI feedback band.
6. The method of claim 5 , wherein a s th vector of the second base vector candidate set is
{
1
exp
(
j
s
N
2
π
)
…
exp
(
j
(
N
-
1
)
s
N
2
π
)
}
,
s being a positive integer.
7. The method of claim 5 , wherein when the second base vector candidate set is the subset of {v 1 , . . . , v N }, a method of determining the second base vector candidate set comprises:
determining the second base vector candidate set based on a starting position of the second base vector candidate set and a number of vectors in the second base vector candidate set.
8. The method of claim 1 , wherein the second base vectors comprise K base vectors selected from X consecutive base vectors in a second base vector candidate set, and X and K are positive integers.
9. The method of claim 1 , wherein the second coefficient amplitude information comprises
two components to be quantized to be between 0 and 1 to generate two quantized components, wherein a coefficient amplitude used in the precoding vector is a product of the two quantized components and the two components comprise a first amplitude component and a second amplitude component.
10. The method of claim 9 , wherein feeding back, by the terminal, the CSI containing the PMI to the base station comprises at least one of:
feeding back a common second amplitude component for a plurality of pieces of second coefficient amplitude information corresponding to a common first base vector; or
feeding back a common second amplitude component for a plurality of pieces of second coefficient amplitude information corresponding to a common second base vector.
11. A channel state information (CSI) receiving method, comprising:
receiving, by a base station, CSI containing precoding matrix indication information (PMI) from a terminal; and
acquiring, by the base station, first base vector information associated with first base vectors, second base vector information associated with second base vectors, and second coefficient information from the PMI, the second coefficient information being used to derive first coefficients and second coefficients, wherein:
the second coefficient information comprises second coefficient amplitude information and second coefficient phase information;
a CSI feedback band comprises a plurality of frequency domain units, each frequency domain unit having a plurality of frequency domain resources;
frequency domain resources in each of the plurality of frequency domain units of a same transmission layer correspond to a same precoding vector, each precoding vector being a linear combination of the first base vectors with weighting coefficients being the first coefficients; and
the first coefficients corresponding to a same first base vector defines a first coefficient vector, the first coefficient vector being a linear combination of the second base vectors with weighting coefficients being the second coefficients.
12. The method of claim 11 , wherein the frequency domain unit comprises at least one of: a sub-band or a first resource block (RB) set, wherein a number of RBs contained in the first RB set is less than a number of RBs contained in a sub-band of the CSI feedback band.
13. The method of claim 11 , wherein receiving, by the base station, the CSI containing the PMI from the terminal:
receiving, by the base station, the CSI including two components of the second coefficient amplitude information and quantizing the two components to be between 0 and 1 to generate two quantized components, wherein a coefficient amplitude used in the precoding vector is a product of the two quantized components and the two components comprise a first amplitude component and a second amplitude component.
14. A channel state information (CSI) feedback apparatus, applied to a terminal, comprising:
at least one processor, configured to determine precoding matrix indication information (PMI), wherein:
the PMI comprises first base vector information associated with first base vectors, second base vector information associated with second base vectors, and second coefficient information, used to derive first coefficients and second coefficients, the second coefficient information comprising second coefficient amplitude information and second coefficient phase information;
a CSI feedback band comprises a plurality of frequency domain units, each frequency domain unit having a plurality of frequency domain resources;
frequency domain resources in each of the plurality of frequency domain units of a same transmission layer corresponds to a same precoding vector, each precoding vector being a linear combination of the first base vectors with weighting coefficients being the first coefficients; and
the first coefficients corresponding to a same first base vector define a first coefficient vector, the first coefficient vector being a linear combination of the second base vectors with weighting coefficients being the second coefficients; and
a transmitter in communication with a base satiation, configured to feedback CSI containing the PMI to the base station.
15. The CSI feedback apparatus of claim 14 , wherein a frequency domain unit of the plurality of frequency domain units comprises at least one of:
a sub-band; or
a first resource block (RB) set, wherein a number of RBs contained in the first RB set is less than a number of RBs contained in a sub-band of the CSI feedback band.
16. The CSI feedback apparatus of claim 14 , wherein the second base vectors comprise discrete Fourier transform (DFT) vectors.
17. The CSI feedback apparatus of claim 14 , wherein a dimension of each second base vector is equal to a number of frequency domain units contained in the CSI feedback band.
18. The CSI feedback apparatus of claim 14 , wherein the second base vectors belong to a second base vector candidate set, the second base vector candidate set is determined based on a parameter N, and the second base vector candidate set is {v 1 , . . . , v N } or a subset of {v 1 , . . . , v N }, wherein N is a number of frequency domain units contained in the CSI feedback band.
19. The CSI feedback apparatus of claim 18 , wherein the at least one processor is further configured to determine the second base vector candidate set based on a starting position of the second base vector candidate set and a number of vectors in the second base vector candidate set.
20. The CSI feedback apparatus of claim 18 , wherein a s th vector of the second base vector candidate set is
{
1
exp
(
j
s
N
2
π
)
…
exp
(
j
(
N
-
1
)
s
N
2
π
)
}
,
s being a positive integer.
21. The CSI feedback apparatus of claim 20 , to feedback the CSI containing the PMI to the base station, the transmitter is configured to perform at least one of the steps comprising:
feeding back a common second amplitude component for a plurality of pieces of second coefficient amplitude information corresponding to a common first base vector; or
feeding back a common second amplitude component for a plurality of pieces of second coefficient amplitude information corresponding to a common second base vector.
22. The CSI feedback apparatus of claim 14 , wherein the second base vectors comprise K base vectors selected from X consecutive base vectors in a second base vector candidate set, and X and K are positive integers.
23. The CSI feedback apparatus of claim 14 , wherein the second coefficient amplitude information comprises two components to be quantized to be between 0 and 1 to generate two quantized components, wherein a coefficient amplitude used in the precoding vector is a product of the two quantized components, and the two components comprise a first amplitude component and a second amplitude component.
24. A base station, comprising:
a memory, storing at least one program; and
at least one processor in communication with the memory and
configured to execute the at least one program to perform the steps, comprising:
receiving CSI containing precoding matrix indication information (PMI) from a terminal; and
acquiring first base vector information associated with first base vectors, second base vector information associated with second base vectors, and second coefficient information from the PMI, the second coefficient information being used to derive first coefficients and second coefficients, wherein:
the second coefficient information comprises second coefficient amplitude information and second coefficient phase information;
a CSI feedback band comprises a plurality of frequency domain units, each frequency domain unit having a plurality of frequency domain resources;
frequency domain resources in each of the plurality of frequency domain units of a same transmission layer correspond to a same precoding vector, each precoding vector being a linear combination of the first base vectors with weighting coefficients being the first coefficients; and
the first coefficients corresponding to a same first base vector define a first coefficient vector, the first coefficient vector being a linear combination of the second base vectors with weighting coefficients being the second coefficients.