CN-122001421-A - Communication method and communication device

Abstract

The application provides a communication method and a communication device. The communication method comprises the steps of receiving a reference signal, wherein the reference signal is used for determining the CSI, and sending first CSI, wherein the first CSI comprises first information and at least two CSI, wherein the first information is used for indicating first channel quality, the second information is used for indicating second channel quality, the first channel quality corresponds to a first precoding matrix, the second channel quality corresponds to a second precoding matrix, the second information indicates deviation between the first channel quality and the second channel quality, and the first information is used for indicating a target stream corresponding to the first channel quality and a target stream corresponding to the second channel quality. According to the communication method, the receiving performance of the terminal can be improved under the condition that the terminal does not report the PMI.

Inventors

• YANG HAOTIAN
• YANG PEI

Assignees

• 华为技术有限公司

Dates

Publication Date

20260508

Application Date

20241105

Claims (20)

1. 1. A method of communication, comprising: receiving a reference signal, wherein the reference signal is used for determining Channel State Information (CSI); And transmitting first CSI, wherein the first CSI comprises first information and at least two pieces of CSI, wherein the first information is used for indicating first channel quality, the second information is used for indicating second channel quality, the first channel quality corresponds to a first precoding matrix, the second channel quality corresponds to a second precoding matrix, the second information is used for indicating deviation between the first channel quality and the second channel quality, and the first information is used for indicating a target stream corresponding to the first channel quality and a target stream corresponding to the second channel quality.
2. 2. The method of claim 1, wherein the first precoding matrix is determined based on a conjugate transpose of a downlink channel matrix, and the second precoding matrix is determined based on a right singular matrix obtained by singular value decomposition SVD of the downlink channel matrix.
3. 3. The method according to claim 1 or 2, characterized in that the method further comprises: and receiving third information, wherein the third information is used for indicating whether to report the CSI based on the first CSI.
4. 4. A method according to any one of claims 1 to 3, further comprising: And sending first capability information, wherein the first capability information is used for indicating the capability of supporting reporting of the CSI based on the first CSI.
5. 5. The method according to any one of claims 1 to 4, wherein the first CSI further comprises fourth information, the fourth information being used to indicate a recommended precoding matrix, the recommended precoding matrix being the first precoding matrix or the second precoding matrix.
6. 6. The method according to any of claims 1 to 5, wherein the reference signal is a channel state information reference signal, CSI-RS.
7. 7. A method of communication, comprising: transmitting a reference signal, wherein the reference signal is used for determining Channel State Information (CSI); Receiving first CSI, wherein the first CSI comprises first information and at least two pieces of CSI, wherein the first information is used for indicating first channel quality, the second information is used for indicating second channel quality, the first channel quality corresponds to a first precoding matrix, the second channel quality corresponds to a second precoding matrix, the second information is used for indicating deviation between the first channel quality and the second channel quality, and the first information is used for indicating a target stream corresponding to the first channel quality and a target stream corresponding to the second channel quality; and transmitting downlink data based on the first CSI.
8. 8. The method of claim 7, wherein the first precoding matrix is determined based on a conjugate transpose of a downlink channel matrix, and the second precoding matrix is determined based on a right singular matrix obtained by singular value decomposition SVD of the downlink channel matrix.
9. 9. The method of claim 8, wherein the transmitting downlink data based on the first CSI comprises: transmitting the downlink data based on the first precoding matrix and a target Modulation and Coding Strategy (MCS); wherein the target MCS is related to the deviation.
10. 10. The method according to any one of claims 7 to 9, further comprising: And sending third information, wherein the third information is used for indicating whether to report the CSI based on the first CSI.
11. 11. The method according to any one of claims 7 to 10, further comprising: and receiving first capability information, wherein the first capability information is used for indicating the capability of supporting reporting of the CSI based on the first CSI.
12. 12. The method according to any one of claims 7 to 11, wherein the first CSI further comprises fourth information indicating a recommended precoding matrix, the recommended precoding matrix being the first precoding matrix or the second precoding matrix.
13. 13. The method according to any of claims 7 to 12, wherein the reference signal is a channel state information reference signal, CSI-RS.
14. 14. A method of communication, comprising: Receiving fifth information, wherein the fifth information is used for indicating reporting of second Channel State Information (CSI), and the second CSI comprises a Precoding Matrix Indicator (PMI) and a Channel Quality Indicator (CQI); And sending third CSI, wherein the third CSI comprises first indication information, second indication information and the CQI, the first indication information is used for indicating to discard the PMI, and the second indication information is used for indicating a target stream used when the CQI is determined.
15. 15. The method of claim 14, wherein the transmitting the third CSI comprises: And if the condition of channel stability is determined to be met, sending the third CSI.
16. 16. The method of claim 15, wherein the channel stability condition comprises one or more of a condition that reference signal received power, RSRP, is greater than a first threshold and a condition that a speed of movement of the terminal is less than or equal to a second threshold.
17. 17. The method according to any one of claims 14 to 16, further comprising: And receiving sixth information, wherein the sixth information is used for indicating whether to report the CSI based on the third CSI.
18. 18. The method according to any one of claims 14 to 17, further comprising: and sending second capability information, wherein the second capability information is used for indicating the capability of supporting reporting of the CSI based on the third CSI.
19. 19. The method according to any one of claims 15 to 18, further comprising: and if the condition of channel stability is not met, sending the second CSI.
20. 20. A method of communication, comprising: transmitting fifth information, wherein the fifth information is used for indicating a terminal to report second Channel State Information (CSI), and the second CSI comprises a Precoding Matrix Indicator (PMI) and a Channel Quality Indicator (CQI); And receiving third CSI, wherein the third CSI comprises first indication information, second indication information and the CQI, the first indication information is used for indicating to discard the PMI, and the second indication information is used for indicating a target flow used by the network equipment when determining the CQI.

Description

Communication method and communication device Technical Field The embodiment of the application relates to the field of communication, in particular to a communication method and a communication device. Background When the network device sends data to the terminal, in order to improve the downlink communication quality, the network device can process the data to be sent by using a precoding matrix matched with the channel, so that the data to be sent is matched with the channel after being processed by the precoding matrix, and therefore, the data of each parallel stream is free from interference when the terminal demodulates. In one implementation, the network device may determine a precoding matrix matching the channel through a precoding matrix indicator (precoding martrix index, PMI) reported by the terminal. But the feedback of PMI from the terminal causes a large overhead for the terminal. Therefore, how to improve the receiving performance of the terminal without reporting the PMI by the network device becomes a technical problem to be solved urgently. Disclosure of Invention The application provides a communication method and a communication device, wherein network equipment can improve the receiving performance of a terminal under the condition that the terminal does not report a PMI. In a first aspect, an embodiment of the present application provides a communication method, which may be applied to a communication device on a terminal side, for example, a terminal or a communication module in the terminal, or a circuit or a chip (such as a modem (modem) chip, also called a baseband (baseband) chip, or a system on chip (SoC) chip or a system-in-package (SYSTEMIN PACKAGE) SIP chip) that includes a modem core, which is responsible for a communication function in the terminal. In the present application, a terminal is described as an example. The communication method comprises the steps of receiving a reference signal, wherein the reference signal is used for determining channel state information (CHANNEL STATE information, CSI), sending first CSI, and the first CSI comprises first information and at least two CSI, wherein the first information is used for indicating first channel quality, the second information is used for indicating second channel quality, the first channel quality corresponds to a first precoding matrix, the second channel quality corresponds to a second precoding matrix, the second information indicates deviation between the first channel quality and the second channel quality, and the first information is used for indicating a target flow corresponding to the first channel quality and a target flow corresponding to the second channel quality. For example, the information indicating the channel quality is a channel quality indication (channel quality indicator, CQI). Correspondingly, the information indicating the first channel quality may be referred to as a first CQI, and the information indicating the second channel quality may be referred to as a second CQI. For example, the reference signal received by the terminal is a channel state information reference signal (CHANNEL STATE information REFERENCE SIGNAL, CSI-RS). In the technical scheme, after receiving a reference signal sent by a network device, a terminal determines a first channel quality corresponding to a first precoding matrix and a second channel quality corresponding to a second precoding matrix based on measurement of the reference signal, and then indicates the first channel quality corresponding to the first precoding matrix and the second channel quality corresponding to the second precoding matrix to the network device. For example, the first precoding matrix is determined based on a conjugate transpose of the downlink channel matrix, and the second precoding matrix is determined based on a right singular matrix obtained by performing singular value decomposition (singular value decomposition, SVD) on the downlink channel matrix. Based on the technical solution provided in the first aspect, since the terminal indicates the target flow corresponding to the first channel quality and the target flow corresponding to the second channel quality to the network device, the network device may determine the first precoding matrix and the second precoding matrix based on the target flow corresponding to the first channel quality and the target flow corresponding to the second channel quality, respectively, and then determine the precoding matrix used when transmitting the downlink data to the terminal based on the deviation between the first channel quality corresponding to the first precoding matrix and the second channel quality corresponding to the second precoding matrix, thereby improving the receiving performance of the terminal. For example, the network device determines a downlink channel matrix based on channel reciprocity of the uplink and downlink channels, then determines a first precoding matrix based on th