Channel state information reporting method and related device

1 . A channel state information reporting method comprising:

generating indication information comprising a first group of indication information and a second group of indication information, wherein:

the first group of indication information comprises reference amplitude indication information corresponding to each spatial layer of a precoding matrix, and differential amplitude indication information and phase indication information of X weighting coefficients;

the second group of indication information comprises differential amplitude indication information and phase indication information of Y weighting coefficients; and

values of X and Y are related to a first parameter, a sum of X and Y is equal to K-v, K is a total quantity of weighting coefficients correspondingly reported at all of the spatial layers, v is a quantity of the spatial layers, K is an integer, X is an integer that is not less than 0, Y is a positive integer, and v is a positive integer; and

sending the indication information.

2 . The method according to claim 1 , wherein the first parameter is ┌K/2┐−v.

3 . The method according to claim 2 , wherein when ┌K/2┐−v≤0 or ┌K/2┐−v<0,

X is equal to 0, and Y is equal to K-v.

4 . The method according to claim 2 , wherein when ┌K/2┐−v≥0 or ┌K/2┐−v>0,

X is equal to ┌K/2┐−v, and Y is equal to ┌K/2┐.

5 . The method according to claim 1 , wherein the first parameter is ┌K/2┐.

6 . The method according to claim 5 , wherein when ┌K/2┐≥v or ┌K/2┐<v,

X is equal to 0, and Y is equal to K−v.

7 . A communication apparatus comprising: at least one processor, and one or more memories communicatively coupled to the at least one processor and being configured to store programming instructions for execution by the at least one processor to perform operations comprising:

generating indication information comprising a first group of indication information and a second group of indication information, wherein:

the first group of indication information comprises reference amplitude indication information corresponding to each spatial layer of a precoding matrix, and differential amplitude indication information and phase indication information of X weighting coefficients;

the second group of indication information comprises differential amplitude indication information and phase indication information of Y weighting coefficients; and

values of X and Y are related to a first parameter, a sum of X and Y is equal to K−v, K is a total quantity of weighting coefficients correspondingly reported at all of the spatial layers, v is a quantity of the spatial layers, K is an integer, X is an integer that is not less than 0, Y is a positive integer, and v is a positive integer; and

sending the indication information.

8 . The apparatus according to claim 7 , wherein the first parameter is ┌K/2┐−v.

9 . The apparatus according to claim 8 , wherein ┌K/2┐−v≤0 or ┌K/2┐−v<0,

X is equal to 0, and Y is equal to K−v.

10 . The apparatus according to claim 8 , wherein when ┌K/2┐−v≥0 or ┌K/2┐−v>0,

X is equal to ┌K/2┐−v, and Y is equal to ┌K/2┐.

11 . The apparatus according to claim 7 , wherein the first parameter is ┌K/2┐.

12 . The apparatus according to claim 11 , wherein when ┌K/2┐≤v or ┌K/2┐<v,

X is equal to 0, and Y is equal to K−v.

13 . The apparatus according to claim 11 , wherein when ┌K/2┐≥v or ┌K/2┐>v,

X is equal to K−v, and Y is equal to K/2.

14 . A communication apparatus comprising: at least one processor, and one or more memories communicatively coupled to the at least one processor and being configured to store programming instructions for execution by the at least one processor to perform operations comprising:

receiving indication information comprising a first group of indication information and a second group of indication information, wherein:

the first group of indication information comprises reference amplitude indication information corresponding to each spatial layer of a precoding matrix, and differential amplitude indication information and phase indication information of X weighting coefficients;

the second group of indication information comprises differential amplitude indication information and phase indication information of Y weighting coefficients; and

values of X and Y are related to a first parameter, a sum of X and Y is equal to K−v, K is a total quantity of weighting coefficients correspondingly reported at all of the spatial layers, v is a quantity of the spatial layers, K is an integer, X is an integer that is not less than 0, Y is a positive integer, and v is a positive integer; and

determining, based on the indication information, a weighting coefficient correspondingly reported by a terminal device.

15 . The apparatus according to claim 14 , wherein the first parameter is ┌K/2┐−v.

16 . The apparatus according to claim 15 , wherein when ┌K/2┐−v≤0 or ┌K/2┐−v<0,

X is equal to 0, and Y is equal to K−v.

17 . The apparatus according to claim 14 , wherein when ┌K/2┐−v≥0 or ┌K/2┐−v>0,

X is equal to ┌K/2┐−v, and Y is equal to ┌K/2┐.

18 . The apparatus according to claim 14 , wherein the first parameter is ┌K/2┐.

19 . The apparatus according to claim 18 , wherein when ┌K/2┐≤v or ┌K/2┐<v,

X is equal to 0, and Y is equal to K−v.

20 . The apparatus according to claim 18 , wherein when ┌K/2┐≥v or ┌K/2┐>0,

X is equal to K−v, and Y is equal to K/2.