US-20260128776-A1 - CHANNEL STATE INFORMATION DETERMINING METHOD AND APPARATUS

Abstract

A channel state information (CSI) determining method and apparatus are provided, and relate to the wireless communication field. In the method, a network device sends at least two reference signals including a first reference signal and a second reference signal, and receives first information. The first information indicates that a part or all of information in CSI corresponding to the second reference signal is determined based on the first reference signal. A sending periodicity of the first reference signal is less than a sending periodicity of the second reference signal. According to the foregoing, the network device can be enabled to efficiently obtain the CSI.

Inventors

• Chencheng YE
• Yiling YUAN
• Xiaohan Wang
• Huangping JIN

Assignees

• HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date

20260507

Application Date

20251230

Priority Date

20230630

Claims (20)

1. 1 . A method, comprising: sending at least two reference signals; and receiving first information, wherein the first information indicates that a part or all of information in channel state information (CSI) corresponding to a second reference signal is determined based on a first reference signal, the first reference signal and the second reference signal belong to the at least two reference signals, and a sending periodicity of the first reference signal is less than a sending periodicity of the second reference signal.
2. 2 . The method according to claim 1 , wherein after receiving the first information, the method further comprises: receiving, based on a third periodicity, the part or all of the information in the CSI corresponding to the second reference signal, wherein the third periodicity is greater than or equal to a first periodicity and is less than a second periodicity, the first periodicity is the sending periodicity of the first reference signal or a CSI reporting periodicity in a CSI reporting configuration of the first reference signal, and the second periodicity is a CSI reporting periodicity in a CSI reporting configuration of the second reference signal.
3. 3 . The method according to claim 2 , wherein the CSI reporting configuration of the second reference signal further comprises the third periodicity.
4. 4 . The method according to claim 2 , wherein the first information further indicates the third periodicity, or a difference between the third periodicity and the first periodicity.
5. 5 . The method according to claim 2 , wherein after receiving the first information, the method further comprises: receiving, based on the second periodicity, a part of information that is in the CSI corresponding to the second reference signal and that is not indicated by the first information.
6. 6 . The method according to claim 1 , wherein when the CSI corresponding to the second reference signal is reported aperiodically, after receiving the first information, the method further comprises: receiving the part or all of the information in the CSI corresponding to the second reference signal at least twice, wherein time points of the at least two receptions are all between time points of two adjacent times of sending of the second reference signal, and the part or all of the information in the CSI corresponding to the second reference signal differs in the at least two receptions.
7. 7 . The method according to claim 1 , wherein when the first information indicates a part of information in the CSI corresponding to the second reference signal, the first information further comprises an identifier of the part of the information in the CSI corresponding to the second reference signal, and the part of the information in the CSI corresponding to the second reference signal comprises at least one of channel quality information (CQI), a precoding matrix indicator (PMI), or a rank indicator (RI).
8. 8 . The method according to claim 1 , wherein before sending the at least two reference signals, the method further comprises: sending configuration information of the at least two reference signals, wherein the configuration information of the at least two reference signals comprises the sending periodicity of the first reference signal and the sending periodicity of the second reference signal.
9. 9 . The method according to claim 1 , wherein before receiving the first information, the method further comprises: sending second information, wherein the second information indicates a terminal to feed back the first information.
10. 10 . The method according to claim 1 , wherein an absolute value of a difference between a sending time point of the first reference signal and a sending time point of the second reference signal is less than or equal to a first preset threshold.
11. 11 . The method according to claim 1 , wherein an absolute value of a difference between a frequency of the first reference signal and a frequency of the second reference signal is less than or equal to a second preset threshold.
12. 12 . The method according to claim 1 , wherein the frequency of the first reference signal is less than the frequency of the second reference signal.
13. 13 . A method, comprising: receiving at least two reference signals; determining first information based on the at least two reference signals, wherein the first information indicates that a part or all of information in channel state information (CSI) corresponding to a second reference signal is determined based on a first reference signal, and the first reference signal and the second reference signal belong to the at least two reference signals; and sending the first information.
14. 14 . The method according to claim 13 , wherein after sending the first information, the method further comprises: sending, based on a third periodicity, the part or all of the information in the CSI corresponding to the second reference signal, wherein the third periodicity is greater than or equal to a first periodicity and is less than a second periodicity, the first periodicity is a sending periodicity of the first reference signal or a CSI reporting periodicity in a CSI reporting configuration of the first reference signal, and the second periodicity is a CSI reporting periodicity in a CSI reporting configuration of the second reference signal.
15. 15 . The method according to claim 14 , wherein the CSI reporting configuration of the second reference signal further comprises the third periodicity.
16. 16 . The method according to claim 14 , wherein the first information further indicates the third periodicity, or a difference between the third periodicity and the first periodicity.
17. 17 . The method according to claim 14 , wherein after sending the first information, the method further comprises: sending, based on the second periodicity, a part of information that is in the CSI corresponding to the second reference signal and that is not indicated by the first information.
18. 18 . The method according to claim 13 , wherein when the CSI corresponding to the second reference signal is reported aperiodically, after sending the first information, the method further comprises: sending the part or all of the information in the CSI corresponding to the second reference signal at least twice, wherein time points of the at least two times of sending are all between time points of two adjacent times of sending of the second reference signal, and the part or all of the information in the CSI corresponding to the second reference signal differs in the at least two times of sending.
19. 19 . The method according to claim 13 , wherein when the first information indicates a part of information in the CSI corresponding to the second reference signal, the first information further comprises an identifier of the part of the information in the CSI corresponding to the second reference signal, and the part of the information in the CSI corresponding to the second reference signal comprises at least one of CQI, a PMI, or a RI.
20. 20 . A non-transitory computer-readable storage medium configured to store instructions, wherein the instructions are configured to be executed to cause a communication apparatus to: send at least two reference signals; and receive first information, wherein the first information indicates that a part or all of information in channel state information (CSI) corresponding to a second reference signal is determined based on a first reference signal, the first reference signal and the second reference signal belong to the at least two reference signals, and a sending periodicity of the first reference signal is less than a sending periodicity of the second reference signal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2024/102074, filed on Jun. 27, 2024, which claims priority to Chinese Patent Application No. 202310798320.5, filed on Jun. 30, 2023. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD The embodiments relate to the field of wireless communication technologies, and to a channel state information determining method and an apparatus. BACKGROUND Currently, the application of a massive multiple-input multiple-output (massive MIMO) technology plays a crucial role in improving spectrum efficiency of a system. When the MIMO technology is used, before sending data to a terminal, a base station needs to precode the data based on channel state information (CSI) reported by the terminal to the base station. Abasic process of CSI reporting between the base station and the terminal is as follows: The base station needs to first send signaling used for notifying a channel measurement configuration, and notifies the terminal of a time period and behavior for channel measurement; then the base station sends a pilot to the terminal, where the pilot is used for channel measurement; the terminal performs measurement based on the pilot sent by the base station, performs calculation to obtain final CSI, and reports the CSI to the base station; and the base station then precodes the data based on the CSI reported by the UE and sends precoded data. The base station may configure a plurality of pilots, and how to improve efficiency of updating the CSI by the terminal based on the pilot is a problem worthy of attention. SUMMARY The embodiments provide a channel state information (CSI) determining method and an apparatus, to enable a terminal to efficiently update and report CSI. According to a first aspect, the embodiments provide a channel state information determining method. The method may be performed by a network device or a module (for example, a chip) in a network device. The method includes: sending at least two reference signals; and receiving first information. The first information indicates that a part or all of information in channel state information CSI corresponding to a second reference signal is determined based on a first reference signal, the first reference signal and the second reference signal belong to the at least two reference signals, and a sending periodicity of the first reference signal is less than a sending periodicity of the second reference signal. According to the foregoing method, after sending the at least two reference signals, the network device may receive the first information. When the first information indicates that the part or all of the information in the CSI corresponding to the second reference signal can be determined based on the first reference signal, the network device may be enabled to schedule, based on the sending periodicity of the first reference signal after receiving the first information, a terminal to report the part or all of the information in the CSI corresponding to the second reference signal, and does not need to wait for sending the second reference signal each time before scheduling the terminal to report updated CSI corresponding to the second reference signal. Therefore, according to the foregoing method, the network device can be enabled to obtain the CSI more efficiently. Further, because the sending periodicity of the first reference signal is less than the sending periodicity of the second reference signal, the network device obtains, in time, the part or all of the information in the CSI corresponding to the second reference signal, so that aging of the CSI corresponding to the second reference signal can also be alleviated, and system performance is improved. In a possible embodiment, after the first information is received, the part or all of the information in the CSI corresponding to the second reference signal is received based on a third periodicity. The third periodicity is greater than or equal to a first periodicity and is less than a second periodicity. The first periodicity is the sending periodicity of the first reference signal or a CSI reporting periodicity in a CSI reporting configuration of the first reference signal, and the second periodicity is a CSI reporting periodicity in a CSI reporting configuration of the second reference signal. According to the foregoing embodiment, a reporting periodicity of the part or all of the information in the CSI corresponding to the second reference signal can be shortened, thereby alleviating aging of the CSI corresponding to the second reference signal. In a possible embodiment, the CSI reporting configuration of the second reference signal further includes the third periodicity. In a possible embodiment, the first information further indicates the third periodicity, or a difference between the third periodicity and the