Method and apparatus for reporting and receiving CSI, and terminal device and network device

1 . A method for reporting Channel State Information (CSI), comprising:

determining, by a terminal device, second information in a second CSI part according to first information in a first CSI part, wherein the first information is assumption information, the assumption information is used for indicating a transmission assumption or a measurement assumption on which reporting the CSI is based, and the second information comprises at least one of: a Precoding Matrix Indicator (PMI), or a Channel Quality Indicator (CQI); and

wherein the determining, by the terminal device, the second information in the second CSI part according to the first information in the first CSI part comprises:

determining, by the terminal device, that the second CSI part comprises one PMI in a case that a value of the assumption information is a first value; and

determining, by the terminal device, that the second CSI part comprises two PMIs and k CQI in a case that the value of the assumption information is a second value, wherein a value of k is 0 or 1;

wherein the value of the assumption information is either the first value or the second value;

wherein the first CSI part include a CQI,

in response to determining that the value of k is 0, the CQI comprised in the first CSI part is obtained, by the terminal device, by performing calculation based on the two PMIs of the second CSI part;

reporting, by the terminal device, the CSI, wherein the CSI comprises the first CSI part and the second CSI part.

2 . The method of claim 1 , wherein

the assumption information is used for indicating whether reporting the CSI is based on the measurement assumption of a single measurement resource or the measurement assumption of a plurality of measurement resources.

3 . The method of claim 2 , wherein the measurement resource comprises at least one of: a Channel Measurement Resource (CMR), or an Interference Measurement Resource (IMR).

4 . The method of claim 1 , wherein all information in the CSI is obtained by performing measurement based on a single measurement resource in a case that the value of the assumption information is the first value.

5 . The method of claim 1 , wherein the two PMIs are obtained by performing measurement based on different measurement resources.

6 . The method of claim 1 , wherein in response to determining that the value of k is 1, the CQI comprised in the first CSI part is obtained by performing calculation based on a first PMI of the two PMIs, and CQI comprised in the second CSI part is obtained by performing calculation based on a second PMI of the two PMIs.

7 . The method of claim 1 , wherein the value of k is determined according to a CSI reporting configuration corresponding to the CSI, or a number of Control Resource Set (CORESET) group indexes configured by a network device, or the value of the assumption information.

8 . The method of claim 1 , wherein in a case that the value of the assumption information is the second value, the second CSI part further comprises one Rank Indicator (RI), and the one RI and a RI comprised in the first CSI part are obtained by performing measurement based on different measurement resources.

9 . The method of claim 8 , wherein a sum of the RI comprised in the second CSI part and the RI comprised in the first CSI part is less than or equal to a maximum number of transmission layers supported by the terminal device.

10 . The method of claim 1 , wherein in a case that the value of the assumption information is the second value, the second CSI part further comprises one Channel state information reference signal Resource Indicator (CRI), and the one CRI and the CRI comprised in the first CSI part are obtained by performing measurement based on different measurement resource sets.

11 . The method of claim 1 , further comprising:

discarding, by the terminal device, at least one piece of a plurality of pieces of information in the second CSI part according to a priority sequence of the plurality of pieces of information in a case that a code rate of a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH) bearing the second CSI part exceeds a first threshold value, wherein a priority corresponding to the discarded information is lower than a priority corresponding to information not to be discarded;

a priority of a first PMI in the second CSI part is higher than a priority of other information in the second CSI part, and there is a corresponding relationship between the first PMI and a RI of the first CSI part.

12 . A method for receiving Channel State Information (CSI), comprising:

receiving, by a network device, the CSI reported by a terminal device, wherein the CSI comprises a first CSI part and a second CSI part; second information in the second CSI part is determined based on first information in the first CSI part; the first information is assumption information; the assumption information is used for indicating a transmission assumption or a measurement assumption on which reporting the CSI is based; and the second information comprises at least one of: a Precoding Matrix Indicator (PMI), or a Channel Quality Indicator (CQI);

wherein the second CSI part comprises one PMI in a case that a value of the assumption information is a first value; and

the second CSI part comprises two PMIs and k CQI in a case that the value of the assumption information is a second value, and a value of k is 0 or 1;

wherein the value of the assumption information is either the first value or the second value;

wherein the first CSI part include a CQI,

in response to determining that the value of k is 0, the CQI comprised in the first CSI part is obtained by performing calculation based on the two PMIs of the second CSI part.

13 . The method of claim 12 , wherein

the assumption information is used for indicating whether reporting the CSI is based on the measurement assumption of a single measurement resource or the measurement assumption of a plurality of measurement resources.

14 . The method of claim 12 , wherein all information in the CSI is obtained by performing measurement based on a single measurement resource in a case that the value of the assumption information is the first value.

15 . The method of claim 12 , wherein the two PMIs are obtained by performing measurement based on different measurement resources.

16 . A terminal device, comprising a processor and a memory, wherein the memory is configured to store a computer program, and the processor is configured to call and run the computer program stored in the memory to perform following operations:

determining second information in a second CSI part according to first information in a first CSI part, wherein the first information is assumption information, the assumption information is used for indicating a transmission assumption or a measurement assumption on which reporting the CSI is based, and the second information comprises at least one of: a Precoding Matrix Indicator (PMI), or a Channel Quality Indicator (CQI); and

wherein the processor is specifically configured to perform following operations:

determining that the second CSI part comprises one PMI in a case that a value of the assumption information is a first value; and

determining that the second CSI part comprises two PMIs and k CQI in a case that the value of the assumption information is a second value, wherein a value of k is 0 or 1;

wherein the value of the assumption information is either the first value or the second value;

wherein the first CSI part include a CQI,

in response to determining that the value of k is 0, the CQI comprised in the first CSI part is obtained by performing calculation based on the two PMIs of the second CSI part;

reporting the CSI, wherein the CSI comprises the first CSI part and the second CSI part.

17 . The terminal device of claim 16 , wherein

the assumption information is used for indicating whether reporting the CSI is based on the measurement assumption of a single measurement resource or the measurement assumption of a plurality of measurement resources.

18 . The terminal device of claim 17 , wherein the measurement resource comprises at least one of: a Channel Measurement Resource (CMR), or an Interference Measurement Resource (IMR).

19 . The terminal device of claim 16 , wherein all information in the CSI is obtained by performing measurement based on a single measurement resource in a case that the value of the assumption information is the first value.

20 . The terminal device of claim 16 , wherein the two PMIs are obtained by performing measurement based on different measurement resources.