Information sending method, information receiving method and related devices

Abstract

The invention provides an information sending method. A first communication device receives a first reference signal from a second communication device through a configurable metasurface; the first communication device measures the first reference signal to obtain a channel parameter of a channel between the first communication device and the second communication device; the first communication device sends first information and / or second information to the second communication device, the first information and / or the second information is determined according to the channel parameters, the first information is used for indicating whether to enhance a rank indicated by rank indication (RI) information, and / or is used for indicating whether to improve power, a characteristic value or a singular value of at least one propagation path, and the second information is used for indicating whether to improve the power, the characteristic value or the singular value of at least one propagation path. The second information is used for indicating the first rank, and / or is used for indicating the power increase amount, the characteristic value increase amount or the singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is a propagation path between the first communication device and the second communication device.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an information sending method, an information receiving method and related devices. Background Art

[0002] MIMO (Multi-input Multi-output) technology utilizes resources in the spatial dimension, and can obtain array gain, multiplexing and diversity gain, and interference cancellation gain in space without increasing the system bandwidth, thereby exponentially increasing the capacity and spectrum efficiency of the communication system. However, as people's requirements for high-speed, high-reliability, and low-latency communications continue to increase, modern communication systems will continue to face challenges of greater capacity, wider coverage, and lower latency, and these requirements have also become key requirements for the next generation of communication systems.

[0003] In order to meet the above challenges, reconfigurable intelligent surfaces (RIS) have been widely studied as a technology with great potential. Figure 1A As shown in FIG, RIS, as an intermediate node, performs forwarding functions similar to those of a relay or integrated access backhaul (IAB). Figure 1A As shown, the channel from the base station 101 to the terminal device 102 is represented as H0, the channel from the base station 101 to the RIS 103 is represented as H1, and the channel between the RIS 103 and the terminal device 102 is represented as H2. Then the signal received by the terminal device 102 can be represented as Y = H0 + H1 * W * H2, where W is the weight coefficient matrix used by the RIS 103. It is not difficult to find that compared with the traditional H0 channel, the RIS provides an additional H1 * W * H2 channel to improve the rank used for communication.

[0004] However, the system performance gain is only reflected when the channel quality of the H0 channel is poor. When the channel quality of the H0 channel is good, the system performance gain cannot be observed. It can be seen that the above technical solution of improving the rank used for communication is limited in the gain scenario of the system performance gain. Summary of the invention

[0005] The present application provides an information sending method, an information receiving method and related devices, which are used for a first communication device to send first information and / or second information to a second communication device. This avoids the problem that in some scenarios, enhancing the rank used for communication leads to a sharp decrease in system performance gain. This is conducive to improving system capacity, thereby ensuring communication performance.

[0006] In a first aspect, the present application provides an information sending method, the method comprising: a first communication device receives a first reference signal from a second communication device via a RIS; the first communication device measures the first reference signal to obtain a channel parameter of a channel between the first communication device and the second communication device; the first communication device sends first information and / or second information to the second communication device, wherein the first information and / or the second information is determined based on the channel parameter, the first information is used to indicate whether to enhance the rank indicated by the rank indicator (RI) information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of the at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the second communication device.

[0007] Optionally, RI information refers to RI information obtained by the first communication device through a traditional channel measurement process. The traditional channel measurement process can be understood as that there is no RIS between the first communication device and the second communication device, and the reference signal is transmitted between the first communication device and the second communication device, and the reference signal is measured to obtain the RI information. In other words, the RI information can be rank information obtained based on the traditional rank information measurement method, and the rank information can be obtained simultaneously in the measurement process of the first reference signal, or can be obtained by other measurement processes different from the measurement process of the first reference signal. For example, the first communication device can obtain the rank information before the measurement process of the first reference signal. Optionally, RIS is located on the surface of the first communication device or the second communication device. RIS is a reflective layer, and RIS can also be called a configurable metasurface, a meta-surface (Meta-Surface) or a super-surface (Super-Surface), which is not specifically limited in this application. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device passing through RIS.

[0008] In the above technical solution, the first information and / or the second information are determined according to the channel parameters of the channel between the first communication device and the second communication device. Among them, the first information and / or the second information are determined according to the channel parameters, and the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path. The second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path. The first rank is greater than or equal to the rank indicated by the RI information, and at least one propagation path is the propagation path between the first communication device and the second communication device. The first communication device sends the first information and / or the second information to the second communication device. Thereby avoiding the problem that the enhancement of the rank used for communication in some scenarios leads to a sharp decrease in system performance gain. The first communication device indicates to the second communication device whether to enhance the rank indicated by the RI information based on the channel parameters. Thereby achieving a reasonable improvement in the rank used for communication, which is conducive to improving the system capacity.

[0009] Based on the first aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting, thereby facilitating the first communication device to determine the first information and / or the second information.

[0010] Based on the first aspect, in a possible implementation method, the channel parameters include: angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the method also includes: the first communication device determines one or more path angle differences according to the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences according to the delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences according to the Doppler information of the multiple propagation paths; the first communication device sends the first information and / or the second information to the second communication device, including: when at least one of the one or more path angle differences is less than or equal to the path angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to the path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than or equal to the path delay difference threshold. When the interest rate difference is less than or equal to the path Doppler information difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, characteristic value or singular value of at least one propagation path; or, when each of the one or more path angle differences is greater than the path angle difference threshold, or, when each of the one or more path delay differences is greater than the path delay difference threshold, or, when each of the one or more path Doppler information differences is greater than the path Doppler information difference threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, characteristic value or singular value of at least one propagation path. It can be seen from this that the first communication device determines the first information and / or the second information based on the angles of multiple propagation paths and the path angle difference threshold. This is conducive to realizing the reasonable improvement of the rank used for communication by the first communication device and improving the system capacity. Avoid the problem that in some scenarios the rank used for communication is enhanced but the system performance gain decreases.Optionally, when at least one of the one or more radial angle differences is less than a radial angle difference threshold, or when at least one of the one or more radial delay differences is less than a radial delay difference threshold, or when at least one of the one or more radial Doppler information differences is less than a radial Doppler information difference threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in at least one The power, eigenvalue or singular value of a propagation path; or, when each of the one or more path angle differences is greater than or equal to the path angle difference threshold, or, when each of the one or more path delay differences is greater than or equal to the path delay difference threshold, or, when each of the one or more path Doppler information differences is greater than or equal to the path Doppler information difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0011] Based on the first aspect, in a possible implementation manner, the channel parameter includes at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the method also includes: the first communication device determines one or more path correlations based on at least one of the angles, powers, delays, and Doppler information of the multiple propagation paths; the first communication device sends the first information and / or the second information to the second communication device, including: when at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each path correlation among the one or more path correlations is less than the path correlation threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path. It can be seen that the first communication device determines the first information and / or the second information based on the angle, power, delay, or Doppler information of multiple propagation paths between the first communication device and the second communication device. This is conducive to realizing the reasonable improvement of the rank used for communication by the first communication device and improving the system capacity. Avoid the problem that the rank used for communication is enhanced in some scenarios but the system performance gain decreases instead. Optionally, when at least one path correlation among one or more path correlations is greater than the path correlation threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each path correlation among one or more path correlations is less than or equal to the path correlation threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0012] Based on the first aspect, in a possible implementation, the channel parameters include at least one of the following: power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device; the method also includes: the first communication device determines one or more path power differences according to the power of the multiple propagation paths, or the first communication device determines one or more path characteristic value differences according to the characteristic values ​​of the multiple propagation paths, or the first communication device determines one or more path singular value differences according to the singular values ​​of the multiple propagation paths; the first communication device sends the first information and / or the second information to the second communication device, including: when at least one path power difference among the one or more path power differences is greater than or equal to the path power difference threshold, or at least one path characteristic value difference among the one or more path characteristic value differences is greater than or equal to the path characteristic value difference threshold, or at least one path singular value difference among the one or more path When the singular value difference is greater than or equal to the path singular value difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each of the path power differences in one or more path power differences is less than the path power difference threshold, or each of the path eigenvalue differences in one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each of the path singular value differences in one or more path singular value differences is less than the path singular value difference threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path. It can be seen from this that the first communication device determines the first information and / or the second information based on the power, eigenvalue, or singular value of multiple propagation paths between the first communication device and the second communication device. This is conducive to realizing the reasonable improvement of the rank used for communication by the first communication device and improving the system capacity. Avoid the problem that in some scenarios the rank used for communication is enhanced but the system performance gain decreases.Optionally, when at least one of the one or more path power differences is greater than the path power difference threshold, or when at least one of the one or more path eigenvalue differences is greater than the path eigenvalue difference threshold, or when at least one of the one or more path singular value differences is greater than the path singular value difference threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each of the path power differences in one or more path power differences is less than or equal to the path power difference threshold, or each of the path eigenvalue differences in one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each of the path singular value differences in one or more path singular value differences is less than or equal to the path singular value difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0013] Based on the first aspect, in a possible implementation, the second information includes the first rank, or includes the improvement amount of the first rank compared to the rank indicated by the RI information. Two possible implementations of the second information indicating the first rank are shown to enrich the implementation of the solution. Furthermore, the second information includes the improvement amount of the first rank compared to the rank indicated by the RI information, which is conducive to reducing the signaling overhead generated by the first communication device indicating the first rank.

[0014] Based on the first aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K]. In this implementation, the value range of the first rank is shown, which is conducive to the implementation of the solution. For the first rank, the maximum does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0015] Based on the first aspect, in a possible implementation, RIS uses a unit weighting coefficient matrix for weighting; when the first communication device sends the first information and the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, or is used to indicate the increase of the power, eigenvalue or singular value of at least one propagation path, or when the first communication device sends the second information, the method further includes: the first communication device sends the third information to the second communication device, and the third information is used to indicate the switching of the weighting coefficient matrix used by RIS. This facilitates the subsequent communication between the first communication device and the second communication device based on the enhanced rank or at least one propagation path enhanced by power, eigenvalue or singular value. It is beneficial to improve system capacity.

[0016] Based on the first aspect, in a possible implementation, the method further includes: the first communication device receives a second reference signal from the second communication device through the RIS; the first communication device measures the second reference signal based on the first information and the second information, or measures the second reference signal based on the second information to obtain first channel characteristic information, the first channel characteristic information is the channel characteristic information of the channel between the first communication device and the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; the first communication device sends the first channel characteristic information to the second communication device. It can be seen that the first communication device measures the second reference signal based on the first information and the second information to obtain the first channel characteristic information. It is convenient for the subsequent second communication device to select appropriate data transmission parameters according to the first channel characteristic information to perform data transmission with the first communication device. This is conducive to ensuring communication performance. For example, the first information is used to indicate the first rank, and the first rank is greater than the rank indicated by the RI information, so that the first communication device and the second communication device communicate based on the enhanced first rank, which is conducive to improving system capacity. Optionally, RIS uses a non-unit weighting coefficient matrix for weighting.

[0017] Based on the first aspect, in a possible implementation, the method further includes: the first communication device receives data from the second communication device, the data is sent according to a data transmission parameter, and the data transmission parameter is determined by the second communication device according to the first channel characteristic information. This is conducive to ensuring communication performance. For example, the first information is used to indicate a first rank, and the first rank is greater than the rank indicated by the RI information, so that the first communication device and the second communication device can perform data transmission based on the enhanced first rank, which is conducive to improving system capacity.

[0018] The second aspect of the present application provides an information receiving method, the method comprising: a second communication device sends a first reference signal to a first communication device via RIS; the second communication device receives the first information and / or the second information from the first communication device, wherein the first information and / or the second information is determined according to the channel parameters of the channel between the first communication device and the second communication device, the channel parameters are obtained by measuring the first reference signal, the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or, to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or, the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the second communication device. In other words, the RI information can be the rank information obtained based on the traditional rank information measurement method, the rank information can be obtained simultaneously in the measurement process of the first reference signal, and can also be obtained in other measurement processes different from the measurement process of the first reference signal, for example, the first communication device can obtain the rank information before the measurement process of the first reference signal. Optionally, the RIS is located on a surface of the first communication device or the second communication device. The RIS is a reflective layer, and the RIS may also be referred to as a configurable metasurface, a meta-surface, or a super-surface, which is not specifically limited in this application. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device passing through the RIS.

[0019] In the above technical solution, the first information and / or the second information is determined according to the channel parameters of the channel between the first communication device and the second communication device. The second communication device receives the first information and / or the second information from the first communication device. This avoids the problem that in some scenarios, enhancing the rank used for communication leads to a sharp decline in system performance gain. The first communication device indicates to the second communication device whether to enhance the rank indicated by the RI information based on the channel parameters. This achieves a reasonable improvement in the rank used for communication, which is conducive to improving system capacity.

[0020] Based on the second aspect, in a possible implementation, the RIS uses a weighting coefficient matrix for weighting, thereby facilitating the first communication device to determine the first information and / or the second information and send the first information and / or the second information.

[0021] Based on the second aspect, in a possible implementation method, the channel parameters include angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; the second communication device receives the first information and / or the second information from the first communication device, including: when at least one of the one or more path angle differences is less than or equal to the path angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to the path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than or equal to the path Doppler information difference threshold, the second communication device receives the first information and the second information from the first communication device, or the second communication device receives the second information from the first communication device; wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate the increase of the power, eigenvalue or singular value of at least one propagation path, one or more path angles. The difference is determined based on the angles of multiple propagation paths, one or more path delay differences are determined based on the delays of multiple propagation paths, and one or more path Doppler information differences are determined based on the Doppler information of multiple propagation paths; or, when each of the one or more path angle differences is greater than the path angle difference threshold, or when each of the one or more path delay differences is greater than the path delay difference threshold, or when each of the one or more path Doppler information differences is greater than the path Doppler information difference threshold, the second communication device receives the first information from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path angle differences are determined based on the angles of multiple propagation paths, one or more path delay differences are determined based on the delays of multiple propagation paths, and one or more path Doppler information differences are determined based on the Doppler information of multiple propagation paths. It can be seen that the first communication device determines the first information and / or the second information based on the angles of multiple propagation paths and the path angle difference threshold. This is conducive to enabling the first communication device to reasonably improve the rank used for communication and improve system capacity, and avoids the problem that the rank used for communication is enhanced but the system performance gain decreases in some scenarios.Optionally, when at least one of the one or more radial angle differences is less than a radial angle difference threshold, or when at least one of the one or more radial delay differences is less than a radial delay difference threshold, or when at least one of the one or more radial Doppler information differences is less than a radial Doppler information difference threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in at least one The power, eigenvalue or singular value of a propagation path; or, when each of the one or more path angle differences is greater than or equal to the path angle difference threshold, or, when each of the one or more path delay differences is greater than or equal to the path delay difference threshold, or, when each of the one or more path Doppler information differences is greater than or equal to the path Doppler information difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0022] Based on the second aspect, in a possible implementation method, the channel parameters include at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the second communication device receives the first information and / or the second information from the first communication device, including: when at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, the second communication device receives the first information and the second information from the first communication device, or the second communication device receives the second information from the first communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in the power of at least one propagation path. , eigenvalues ​​or singular values, one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of multiple propagation paths between the first communication device and the second communication device; or, when each of the one or more path correlations is less than the path correlation threshold, the second communication device receives the first information from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, to indicate that the power, eigenvalues ​​or singular values ​​of at least one propagation path are not increased, and one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of multiple propagation paths between the first communication device and the second communication device. It can be seen that the first communication device determines the first information and / or the second information based on the angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device. This is conducive to realizing that the first communication device reasonably improves the rank used for communication and improves the system capacity. Avoid the problem that the rank used for communication is enhanced in some scenarios but the system performance gain decreases instead. Optionally, when at least one path correlation among one or more path correlations is greater than a path correlation threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in the power, eigenvalue or singular value of at least one propagation path; or, when each path correlation among one or more path correlations is less than or equal to the path correlation threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or is used to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0023] Based on the second aspect, in a possible implementation method, the channel parameters include at least one of the following: power, eigenvalues ​​or singular values ​​of multiple propagation paths between the first communication device and the second communication device; the second communication device receives the first information and / or the second information from the first communication device, including: when at least one path power difference among one or more path power differences is greater than or equal to a path power difference threshold, or at least one path eigenvalue difference among one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to a path singular value difference threshold, the second communication device receives the first information and the second information from the first communication device, or the second communication device receives the second information from the first communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, one or more path power differences. The difference is determined based on the power of multiple propagation paths, one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of multiple propagation paths; or, when each path power difference in one or more path power differences is less than a path power difference threshold, or each path eigenvalue difference in one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each path singular value difference in one or more path singular value differences is less than the path singular value difference threshold, the second communication device receives the first information from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, is used to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path power differences are determined based on the power of multiple propagation paths, one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of multiple propagation paths. It can be seen that the first communication device determines the first information and / or the second information based on the power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device. This is conducive to realizing the reasonable improvement of the rank used for communication by the first communication device and improving the system capacity. It avoids the problem that the rank used for communication is enhanced in some scenarios but the system performance gain decreases instead.Optionally, when at least one of the one or more path power differences is greater than the path power difference threshold, or when at least one of the one or more path eigenvalue differences is greater than the path eigenvalue difference threshold, or when at least one of the one or more path singular value differences is greater than the path singular value difference threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each of the path power differences in one or more path power differences is less than or equal to the path power difference threshold, or each of the path eigenvalue differences in one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each of the path singular value differences in one or more path singular value differences is less than or equal to the path singular value difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0024] Based on the second aspect, in a possible implementation, the second information includes the first rank, or includes the amount of improvement of the first rank relative to the rank indicated by the RI information. Two possible implementations of the second information indicating the first rank are shown to enrich the implementation of the scheme. Furthermore, the second information includes the amount of improvement of the first rank compared to the rank indicated by the RI information, which is conducive to reducing the signaling overhead generated by the first communication device indicating the first rank.

[0025] Based on the second aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K]. In this implementation, the value range of the first rank is shown, which is conducive to the implementation of the solution. For the first rank, the maximum does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0026] Based on the second aspect, in a possible implementation, RIS uses a unit weighting coefficient matrix for weighting; when the second communication device receives the first information and the second information from the first communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, is used to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; the method also includes: the second communication device receives the third information from the first communication device, and the third information is used to switch the weighting coefficient matrix used by RIS. This facilitates subsequent communication between the first communication device and the second communication device based on the enhanced rank or at least one propagation path enhanced by power, eigenvalue or singular value. It is beneficial to improve system capacity.

[0027] Based on the second aspect, in a possible implementation, the method further includes: the second communication device sends a second reference signal to the first communication device through RIS; the second communication device receives first channel characteristic information from the first communication device, the first channel characteristic information is determined based on the first channel information, the first channel information is obtained by the first communication device measuring the second reference signal based on the first information and / or the second information, or the first channel information is obtained by the first communication device measuring the second reference signal based on the second information. After the second communication device obtains the first channel characteristic information, it is convenient to select appropriate data transmission parameters according to the first channel characteristic information to perform data transmission with the first communication device. This is conducive to ensuring communication performance. For example, the first information is used to indicate the first rank, and the first rank is greater than the rank indicated by the RI information, so that the first communication device and the second communication device communicate based on the enhanced first rank, which is conducive to improving system capacity. Optionally, RIS uses a non-unit weighting coefficient matrix for weighting.

[0028] Based on the second aspect, in a possible implementation, the method further includes: the second communication device determines a data transmission parameter according to the first channel characteristic information; the second communication device sends data to the first communication device through the data transmission parameter. This is conducive to ensuring communication performance. For example, the first information is used to indicate a first rank, and the first rank is greater than the rank indicated by the RI information, so that the first communication device and the second communication device can perform data transmission based on the enhanced first rank, which is conducive to improving system capacity.

[0029] The third aspect of the present application provides an information sending method, the method comprising: a first communication device receives a first reference signal from a second communication device through RIS; the first communication device measures the first reference signal to obtain first channel characteristic information and second channel characteristic information, the first channel characteristic information includes a first rank, the first rank is greater than the rank indicated by the RI information, and the second channel characteristic information is determined according to the first channel characteristic information; the first communication device sends the first channel characteristic information and the second channel characteristic information to the second communication device. This facilitates the second communication device to communicate with the first communication device using an enhanced first rank, which is beneficial to improving system performance gain and system capacity. In other words, the RI information can be rank information obtained based on a traditional rank information measurement method, and the rank information can be obtained simultaneously in the measurement process of the first reference signal, or can be obtained in other measurement processes different from the measurement process of the first reference signal. For example, the first communication device can obtain the rank information before the measurement process of the first reference signal. Optionally, RIS is located on the surface of the first communication device or the second communication device. RIS is a reflective layer, and RIS can also be called a configurable metasurface, a meta-surface (Meta-Surface) or a super-surface (Super-Surface), which is not specifically limited in this application. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device passing through the RIS.

[0030] Based on the third aspect, in a possible implementation, RIS uses a weighting coefficient matrix for weighting.

[0031] Based on the third aspect, in a possible implementation, the method further includes: the first communication device sends indication information to the second communication device, the indication information is used to indicate that the second channel characteristic information is determined based on the first rank, so as to facilitate the second communication device to know that the second channel characteristic information is determined based on the enhanced rank.

[0032] Based on the third aspect, in a possible implementation, the first communication device measures the first reference signal to obtain the first channel characteristic information, including: the first communication device measures the first reference signal to obtain the channel parameters of the channel between the first communication device and the second communication device; the first communication device determines the first channel characteristic information according to the channel parameters. Thus, the first communication device determines the rank indicated by the enhanced RI information based on the channel parameters, and reasonably improves the rank used for communication, which is conducive to improving system capacity.

[0033] Based on the third aspect, in a possible implementation, the channel parameters include angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the method also includes: the first communication device determines one or more path angle differences according to the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences according to the delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences according to the Doppler information of the multiple propagation paths, wherein at least one of the one or more path angle differences is less than or equal to the path angle threshold, or the one or more path delay differences are less than or equal to the path delay difference threshold, or the one or more path Doppler information differences are less than or equal to the path Doppler information difference. Or, at least one of the one or more path angle differences is less than the path angle threshold, or the one or more path delay differences are less than the path delay difference threshold, or the one or more path Doppler information differences are less than the path Doppler information difference. Thus, when at least one of the one or more radial angle differences is less than or equal to the radial angle threshold, or when the one or more path delay differences are less than or equal to the path delay difference threshold, or when the one or more path Doppler information differences are less than or equal to the path Doppler information difference, the first communication device can determine the rank indicated by the enhanced RI information. Reasonable improvement of the rank used for communication is achieved, which is conducive to improving system capacity.

[0034] Based on the third aspect, in a possible implementation, the channel parameters include angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the method also includes: the first communication device determines one or more path correlations based on at least one of the angles, powers, delays, and Doppler information of the multiple propagation paths, wherein at least one of the one or more path correlations is greater than or equal to a path correlation threshold, or at least one of the one or more path correlations is greater than a path correlation threshold. Thus, when at least one of the one or more path correlations is greater than or equal to the path correlation threshold, the first communication device can determine the rank indicated by the enhanced RI information. Reasonable improvement of the rank used for communication is achieved, which is conducive to improving system capacity.

[0035] Based on the third aspect, in a possible implementation, the channel parameters include the power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device; the method also includes: the first communication device determines one or more path power differences according to the power of the multiple propagation paths, or the first communication device determines one or more path characteristic value differences according to the characteristic values ​​of the multiple propagation paths, or the first communication device determines one or more path singular value differences according to the singular values ​​of the multiple propagation paths; wherein, when at least one path power difference among the one or more path power differences is greater than or equal to the path power difference threshold, or at least one path characteristic value difference among the one or more path characteristic value differences is greater than or equal to the path characteristic value difference threshold, or at least one path singular value difference among the one or more path singular value differences is greater than or equal to the path singular value difference threshold. Alternatively, when at least one path power difference among the one or more path power differences is greater than the path power difference threshold, or at least one path characteristic value difference among the one or more path characteristic value differences is greater than the path characteristic value difference threshold, or at least one path singular value difference among the one or more path singular value differences is greater than the path singular value difference threshold. Thus, when at least one path power difference among one or more path power differences is greater than or equal to the path power difference threshold, or at least one path characteristic value difference among one or more path characteristic value differences is greater than or equal to the path characteristic value difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to the path singular value difference threshold, the first communication device can determine the rank indicated by the enhanced RI information. Reasonable improvement of the rank used for communication is conducive to improving system capacity.

[0036] Based on the third aspect, in a possible implementation, the value of the first rank belongs to the interval (K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device. In this implementation, the value range of the first rank is shown, which is conducive to the implementation of the solution. For the first rank, the maximum does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0037] Based on the third aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting; the method further includes: the first communication device sends switching information to the second communication device, the switching information is used to indicate the weighting coefficient matrix used by the switching RIS. This facilitates subsequent communication between the first communication device and the second communication device based on the enhanced rank, which is conducive to improving system capacity.

[0038] Based on the third aspect, in a possible implementation, the method further includes: the first communication device receives data from the second communication device through the RIS, the data is sent according to the data transmission parameter, and the data transmission parameter is determined according to the first channel characteristic information and the second channel characteristic information. Thereby, the first communication device and the second communication device perform data transmission based on the enhanced first rank, which is conducive to improving the system capacity. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0039] The fourth aspect of the present application provides an information receiving method, the method comprising: a second communication device sends a first reference signal to a first communication device through RIS; the second communication device receives first channel characteristic information and second channel characteristic information from the first communication device, the first channel characteristic information includes a first rank, the first rank is greater than the rank indicated by the RI information, and the second channel characteristic information is determined according to the first channel characteristic information. This facilitates the second communication device to communicate with the first communication device using an enhanced first rank, which is beneficial to improving system performance gain and system capacity. In other words, the RI information can be rank information obtained based on a traditional rank information measurement method, and the rank information can be obtained simultaneously in the measurement process of the first reference signal, or can be obtained in other measurement processes different from the measurement process of the first reference signal. For example, the first communication device can obtain the rank information before the measurement process of the first reference signal. Optionally, RIS is located on the surface of the first communication device or the second communication device. RIS is a reflection layer, and RIS can also be called a configurable metasurface, a meta-surface (Meta-Surface) or a super-surface (Super-Surface), which is not specifically limited in this application. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device passing through RIS.

[0040] Based on the fourth aspect, in a possible implementation manner, RIS uses a weighting coefficient matrix for weighting.

[0041] Based on the fourth aspect, in a possible implementation manner, the first channel characteristic information is determined according to a channel parameter of a channel between the first communication device and the second communication device.

[0042] Based on the fourth aspect, in a possible implementation, the channel parameters include angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; at least one of the one or more path angle differences is less than or equal to the path angle threshold, or the one or more path delay differences are less than or equal to the path delay difference threshold, or the one or more path Doppler information differences are less than or equal to the path Doppler information difference. Alternatively, at least one of the one or more path angle differences is less than the path angle threshold, or the one or more path delay differences are less than the path delay difference threshold, or the one or more path Doppler information differences are less than the path Doppler information difference. The one or more path angle differences are determined based on the angles of the multiple propagation paths, the one or more path delay differences are determined based on the delays of the multiple propagation paths, and the one or more path Doppler information differences are determined based on the Doppler information of the multiple propagation paths.

[0043] Based on the fourth aspect, in a possible implementation method, the channel parameters include angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, or at least one path correlation among the one or more path correlations is greater than the path correlation threshold, and the one or more path correlations are determined based on at least one item of the angles, powers, delays, and Doppler information of the multiple propagation paths.

[0044] Based on the fourth aspect, in a possible implementation method, the channel parameters include power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device; when at least one path power difference among one or more path power differences is greater than or equal to a path power difference threshold, or at least one path eigenvalue difference among one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to a path singular value difference threshold, the one or more path power differences are determined based on the power of the multiple propagation paths, the one or more path eigenvalue differences are determined based on the eigenvalues ​​of the multiple propagation paths, and the one or more path singular value differences are determined based on the singular values ​​of the multiple propagation paths.

[0045] Based on the fourth aspect, in a possible implementation, the method further includes: the second communication device receives indication information from the first communication device, the indication information is used to indicate that the second channel characteristic information is determined based on the first rank, so as to facilitate the second communication device to know that the second channel characteristic information is determined based on the enhanced rank.

[0046] Based on the fourth aspect, in a possible implementation, the value of the first rank belongs to the interval (K, L path ], K is the rank indicated by the RI information, L pathis the total number of propagation paths between the first communication device and the second communication device. In this implementation, the value range of the first rank is shown, which is conducive to the implementation of the solution. For the first rank, the maximum does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0047] Based on the fourth aspect, in a possible implementation, the RIS uses a weighting coefficient matrix for weighting; the method further includes: the second communication device receives switching information from the first communication device, the switching information is used to indicate the weighting coefficient matrix used by the switching RIS. This facilitates subsequent communication between the first communication device and the second communication device based on the enhanced rank, which is conducive to improving system capacity.

[0048] Based on the fourth aspect, in a possible implementation, the method further includes: the second communication device determines a data transmission parameter according to the first channel characteristic information and the second channel characteristic information; the second communication device sends data to the first communication device through the RIS according to the data transmission parameter. Optionally, the RIS uses a non-unit weighting coefficient matrix. Thus, the first communication device and the second communication device perform data transmission based on the enhanced first rank, which is conducive to improving system capacity.

[0049] The fifth aspect of the present application provides an information sending method, the method comprising: a first communication device receives a first reference signal from a second communication device through RIS; the first communication device measures the first reference signal to obtain a channel characteristic of a channel between the first communication device and the second communication device, the channel characteristic is obtained by measuring the first reference signal based on the first information and / or the second information, the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or, to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or, the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and at least one propagation path is the propagation path between the first communication device and the second communication device; the first communication device sends first channel characteristic information to the second communication device; wherein the first channel characteristic information includes channel characteristics and status information, and the status information is used to indicate that the channel characteristics are obtained based on the first information and / or the second information; or, the first channel characteristic information includes the first information and / or the second information, and the channel characteristics. Thereby avoiding the problem that enhancing the rank used for communication in some scenarios leads to a sharp decline in system performance gain. It is beneficial to improve the system capacity, thereby ensuring the communication performance. In other words, the RI information can be the rank information obtained based on the traditional rank information measurement method, and the rank information can be obtained simultaneously in the measurement process of the first reference signal, or can be obtained in other measurement processes different from the measurement process of the first reference signal. For example, the first communication device can obtain the rank information before the measurement process of the first reference signal. Optionally, RIS is located on the surface of the first communication device or the second communication device. RIS is a reflective layer, and RIS can also be called a configurable metasurface, meta-surface (Meta-Surface) or super-surface (Super-Surface), which is not limited in this application. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device passing through RIS.

[0050] Based on the fifth aspect, in a possible implementation manner, RIS uses a weighting coefficient matrix for weighting.

[0051] Based on the fifth aspect, in a possible implementation, the method further includes: the first communication device determines the first information and / or the second information based on the channel parameters of the channel between the first communication device and the second communication device, and the channel parameters are obtained by measuring the first reference signal. In this implementation, the first communication device determines whether to enhance the rank indicated by the RI information, or whether to increase the power, eigenvalue or singular value of at least one propagation path based on the channel parameters. This is conducive to achieving a reasonable improvement in the rank used for communication and to improving system capacity.

[0052] Based on the fifth aspect, in a possible implementation method, the channel parameters include: angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; the first communication device determines the first information and / or the second information according to the channel parameters of the channel between the first communication device and the second communication device, including: the first communication device determines one or more path angle differences according to the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences according to the delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences according to the Doppler information of the multiple propagation paths; when at least one of the one or more path angle differences is less than or equal to the path angle threshold, or when at least one of the one or more path delay differences is less than or equal to the path delay difference threshold, or when one or more path Doppler information differences are greater than or equal to the path delay difference threshold; When there is at least one path Doppler information difference in the Doppler information difference that is less than or equal to the path Doppler information difference threshold, the first communication device determines the first information and the second information, or the first communication device determines the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, characteristic value or singular value of at least one propagation path; or, when each path angle difference in one or more path angle differences is greater than the path angle threshold, or, when each path delay difference in one or more path delay differences is greater than the path delay difference threshold, or, when each path Doppler information difference in one or more path Doppler information differences is greater than the path Doppler information difference threshold, the first communication device determines the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, characteristic value or singular value of at least one propagation path. This is conducive to realizing that the first communication device reasonably improves the rank used for communication and improves the system capacity. It avoids the problem that the rank used for communication is enhanced in some scenarios but the system performance gain decreases instead.Optionally, when at least one of the one or more radial angle differences is less than the radial angle difference threshold, or when at least one of the one or more radial delay differences is less than the radial delay difference threshold, or when at least one of the one or more radial Doppler information differences is less than the radial Doppler information difference threshold, the first communication device determines the first information and the second information, or the first communication device determines the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate the increase of the power, characteristic value or singular value of at least one propagation path; or, when each of the one or more radial angle differences is greater than or equal to the radial angle difference threshold, or, when each of the one or more radial delay differences is greater than or equal to the radial delay difference threshold, or, when each of the one or more radial Doppler information differences is greater than or equal to the radial Doppler information difference threshold, the first communication device determines the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or is used to indicate not to increase the power, characteristic value or singular value of at least one propagation path.

[0053] Based on the fifth aspect, in a possible implementation, the channel parameter includes at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the first communication device determines the first information and / or the second information according to the channel parameters of the channel between the first communication device and the second communication device, including: the first communication device determines one or more path correlations according to at least one of the angles, powers, delays, and Dopplers of the multiple propagation paths; when at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, the first communication device determines the first information and the second information, or the first communication device determines the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue, or singular value of at least one propagation path; or, when each path correlation among the one or more path correlations is less than the path correlation threshold, the first communication device determines the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue, or singular value of at least one propagation path. This is conducive to realizing that the first communication device reasonably improves the rank used for communication and improves system capacity. Avoid the problem that the rank used for communication is enhanced in some scenarios but the system performance gain decreases. Optionally, when at least one path correlation among one or more path correlations is greater than a path correlation threshold, the first communication device determines the first information and the second information, or the first communication device determines the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each path correlation among one or more path correlations is less than or equal to the path correlation threshold, the first communication device determines the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0054] Based on the fifth aspect, in a possible implementation method, the channel parameters include at least one of the following: power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device; the first communication device determines the first information and / or the second information according to the channel parameters of the channel between the first communication device and the second communication device, including: the first communication device determines one or more path power differences according to the power of the multiple propagation paths, or the first communication device determines one or more path characteristic value differences according to the characteristic values ​​of the multiple propagation paths, or the first communication device determines one or more path singular value differences according to the singular values ​​of the multiple propagation paths; when at least one path power difference among the one or more path power differences is greater than or equal to the path power difference threshold, or at least one path characteristic value difference among the one or more path characteristic value differences is greater than or equal to the path characteristic value difference threshold, or one When at least one path singular value difference among one or more path singular value differences is greater than or equal to the path singular value difference threshold, the first communication device determines the first information and the second information, or the first communication device determines the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each path power difference among one or more path power differences is less than the path power difference threshold, or each path eigenvalue difference among one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each path singular value difference among one or more path singular value differences is less than the path singular value difference threshold, the first communication device determines the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path. It can be seen from this that the first communication device determines the first information and / or the second information based on the power, eigenvalue, or singular value of multiple propagation paths between the first communication device and the second communication device. This is conducive to realizing the reasonable improvement of the rank used for communication by the first communication device and improving the system capacity. Avoid the problem that in some scenarios the rank used for communication is enhanced but the system performance gain decreases.Optionally, when at least one of the one or more path power differences is greater than the path power difference threshold, or when at least one of the one or more path eigenvalue differences is greater than the path eigenvalue difference threshold, or when at least one of the one or more path singular value differences is greater than the path singular value difference threshold, the first communication device determines the first information and the second information, or the first communication device determines the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in the power, eigenvalue or singular value of at least one propagation path; or, when each of the one or more path power differences is less than or equal to the path power difference threshold, or each of the one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each of the one or more path singular value differences is less than or equal to the path singular value difference threshold, the first communication device determines the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or is used to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0055] Based on the fifth aspect, in a possible implementation, the second information includes the first rank, or includes the amount of improvement of the first rank compared to the rank indicated by the RI information. Two possible implementations of the second information indicating the first rank are shown to enrich the implementation of the scheme. Furthermore, the second information includes the amount of improvement of the first rank compared to the rank indicated by the RI information, which is conducive to reducing the signaling overhead generated by the first communication device indicating the first rank.

[0056] Based on the fifth aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K]. In this implementation, the value range of the first rank is shown, which is conducive to the implementation of the solution. For the first rank, the maximum does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0057] Based on the fifth aspect, in a possible implementation, RIS uses a unit weighting coefficient matrix for weighting; the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; the method also includes: the first communication device sends third information to the second communication device, and the third information is used to indicate the switching of the weighting coefficient matrix used by RIS. This facilitates subsequent communication between the first communication device and the second communication device based on the enhanced rank or at least one propagation path enhanced by power, eigenvalue or singular value. It is beneficial to improve system capacity.

[0058] Based on the fifth aspect, in a possible implementation, the method further includes: the first communication device receives data from the second communication device through the RIS, the data is sent according to the data transmission parameter, and the data transmission parameter is determined according to the first channel characteristic information. This is conducive to ensuring communication performance. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting. For example, the first information is used to indicate the first rank, and the first rank is greater than the rank indicated by the RI information, so that the first communication device and the second communication device can perform data transmission based on the enhanced first rank, which is conducive to improving system capacity.

[0059] The sixth aspect of the present application provides an information receiving method, the method comprising: a second communication device sends a first reference signal to a first communication device via RIS; the second communication device receives first channel characteristic information from the first communication device, the first channel characteristic information includes channel characteristics and state information, or the first channel characteristic information includes first information and / or second information, and channel characteristics; wherein the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information; the state information is used to indicate that the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information; the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or, to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or, the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and at least one propagation path is the propagation path between the first communication device and the second communication device. Thereby avoiding the problem that in some scenarios, enhancing the rank used for communication leads to a sharp drop in system performance gain. It is beneficial to improve system capacity, thereby ensuring communication performance. In other words, the RI information may be rank information obtained based on a traditional rank information measurement method, and the rank information may be obtained simultaneously during the measurement process of the first reference signal, or may be obtained during other measurement processes different from the measurement process of the first reference signal. For example, the first communication device may obtain the rank information before the measurement process of the first reference signal. Optionally, the RIS is located on the surface of the first communication device or the second communication device. RIS is a reflective layer, and RIS may also be referred to as a configurable metasurface, a meta-surface, or a super-surface, which is not specifically limited in this application. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device passing through the RIS.

[0060] Based on the sixth aspect, in a possible implementation manner, RIS uses a weighting coefficient matrix for weighting.

[0061] Based on the sixth aspect, in a possible implementation manner, the first information and / or the second information is determined based on a channel parameter of a channel between the first communication device and the second communication device, and the channel parameter is obtained by measuring a first reference signal.

[0062] Based on the sixth aspect, in a possible implementation method, the channel parameters include angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; when at least one of the one or more path angle differences is less than or equal to a path angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to a path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than or equal to a path Doppler information difference threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, one or more path angle differences are determined based on the angles of the multiple propagation paths, and one or more path delay differences are determined based on the multiple propagation paths. The first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path angle differences are determined according to the angles of multiple propagation paths, one or more path delay differences are determined according to the delays of multiple propagation paths, and one or more path Doppler information differences are determined according to the Doppler information of multiple propagation paths; or, when each path angle difference in one or more path angle differences is greater than a path angle difference threshold, or when each path delay difference in one or more path delay differences is greater than a path delay difference threshold, or when each path Doppler information difference in one or more path Doppler information differences is greater than a path Doppler information difference threshold, the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path angle differences are determined according to the angles of multiple propagation paths, one or more path delay differences are determined according to the delays of multiple propagation paths, and one or more path Doppler information differences are determined according to the Doppler information of multiple propagation paths. Optionally, when at least one of the one or more radial angle differences is less than the radial angle difference threshold, or when at least one of the one or more radial delay differences is less than the radial delay difference threshold, or when at least one of the one or more radial Doppler information differences is less than the radial Doppler information difference threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate the increase of the power, characteristic value or singular value of at least one propagation path; or, when each of the one or more radial angle differences is greater than or equal to the radial angle difference threshold, or when each of the one or more radial delay differences is greater than or equal to the radial delay difference threshold, or when each of the one or more radial Doppler information differences is greater than or equal to the radial Doppler information difference threshold, the first information is used to indicate not to enhance the rank indicated by the RI information, and / or to indicate not to increase the power, characteristic value or singular value of at least one propagation path.

[0063] Based on the sixth aspect, in a possible implementation method, the channel parameters include at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; when at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate to increase the power, eigenvalue or singular value of at least one propagation path, and the one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of the multiple propagation paths between the first communication device and the second communication device; or, when each of the one or more path correlations is less than the path correlation threshold, the first information is used to indicate not to enhance the rank indicated by the RI information, and / or to indicate not to increase the power, eigenvalue or singular value of at least one propagation path, and the one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of the multiple propagation paths between the first communication device and the second communication device. Optionally, when at least one path correlation among one or more path correlations is greater than a path correlation threshold, the first information is used to indicate that the rank indicated by the enhanced RI information is to be indicated, and / or, to indicate that the power, eigenvalue or singular value of at least one propagation path is increased; or, when each of the path correlations among one or more path correlations is less than or equal to a path correlation threshold, the first information is used to indicate that the rank indicated by the RI information is not to be enhanced, and / or, to indicate that the power, eigenvalue or singular value of at least one propagation path is not to be increased.

[0064] Based on the sixth aspect, in a possible implementation method, the channel parameters include at least one of the following: power, eigenvalues ​​or singular values ​​of multiple propagation paths between the first communication device and the second communication device; when at least one path power difference among one or more path power differences is greater than or equal to a path power difference threshold, or at least one path eigenvalue difference among one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to a path singular value difference threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, one or more path power differences are determined based on the power of multiple propagation paths, and one or more path eigenvalue differences are determined based on multiple The first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path power differences are determined based on the powers of multiple propagation paths, one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of multiple propagation paths; or, when each path power difference in one or more path power differences is less than a path power difference threshold, or each path eigenvalue difference in one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each path singular value difference in one or more path singular value differences is less than the path singular value difference threshold, the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path power differences are determined based on the powers of multiple propagation paths, one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of multiple propagation paths. Optionally, when at least one of the one or more path power differences is greater than the path power difference threshold, or when at least one of the one or more path eigenvalue differences is greater than the path eigenvalue difference threshold, or when at least one of the one or more path singular value differences is greater than the path singular value difference threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate to increase the power, eigenvalue or singular value of at least one propagation path; or, when each of the path power differences in one or more path power differences is less than or equal to the path power difference threshold, or each of the path eigenvalue differences in one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each of the path singular value differences in one or more path singular value differences is less than or equal to the path singular value difference threshold, the first information is used to indicate not to enhance the rank indicated by the RI information, and / or to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0065] Based on the sixth aspect, in a possible implementation, the second information includes the first rank, or includes the amount of improvement of the first rank relative to the rank indicated by the RI information. Two possible implementations of the second information indicating the first rank are shown to enrich the implementation of the scheme. Furthermore, the second information includes the amount of improvement of the first rank compared to the rank indicated by the RI information, which is conducive to reducing the signaling overhead generated by the first communication device indicating the first rank.

[0066] Based on the sixth aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K]. In this implementation, the value range of the first rank is shown, which is conducive to the implementation of the solution. For the first rank, the maximum does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0067] Based on the sixth aspect, in a possible implementation, RIS uses a unit weighting coefficient matrix for weighting; the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; the method also includes: the second communication device receives the third information from the first communication device, and the third information is used to switch the weighting coefficient matrix used by RIS. This facilitates subsequent communication between the first communication device and the second communication device based on the enhanced rank or at least one propagation path enhanced by power, eigenvalue or singular value. It is beneficial to improve system capacity.

[0068] Based on the sixth aspect, in a possible implementation, the method further includes: the second communication device determines a data transmission parameter according to the first channel characteristic information; the second communication device sends data to the first communication device through the RIS according to the data transmission parameter. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting. This is conducive to ensuring communication performance. For example, the first information is used to indicate a first rank, and the first rank is greater than the rank indicated by the RI information, so that the first communication device and the second communication device can perform data transmission based on the enhanced first rank, which is conducive to improving system capacity.

[0069] A seventh aspect of the present application provides a first communication device, including:

[0070] A transceiver module, configured to receive a first reference signal from a second communication device via the RIS;

[0071] A processing module, configured to measure the first reference signal to obtain a channel parameter of a channel between the first communication device and the second communication device;

[0072] The transceiver module is also used to send the first information and / or the second information to the second communication device, wherein the first information and / or the second information is determined based on the channel parameters, the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of the at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the second communication device.

[0073] Based on the seventh aspect, in a possible implementation manner, RIS uses a unit weighting coefficient matrix for weighting.

[0074] Based on the seventh aspect, in a possible implementation method, the channel parameters include: angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the processing module is also used to: determine one or more path angle differences according to the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences according to the delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences according to the Doppler information of the multiple propagation paths; the transceiver module is specifically used to: when at least one of the one or more path angle differences is less than or equal to the path angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to the path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than When the rank indicated by the RI information is greater than or equal to the path-Doppler information difference threshold, the first information and the second information are sent to the second communication device, or the second information is sent to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate the increase of the power, characteristic value or singular value of at least one propagation path; or, when each of the one or more path angle differences is greater than the path angle difference threshold, or, when each of the one or more path delay differences is greater than the path delay difference threshold, or, when each of the one or more path Doppler information differences is greater than the path Doppler information difference threshold, the first information is sent to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or is used to indicate not to increase the power, characteristic value or singular value of at least one propagation path.

[0075] Based on the seventh aspect, in a possible implementation method, the channel parameters include at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the processing module is also used to: determine one or more path correlations based on at least one of the angles, powers, delays, and Dopplers of the multiple propagation paths; the transceiver module is specifically used to: when at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, send first information and second information to the second communication device, or send second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate an increase in the power, eigenvalue, or singular value of at least one propagation path; or, when each path correlation among the one or more path correlations is less than the path correlation threshold, send first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue, or singular value of at least one propagation path.

[0076] Based on the seventh aspect, in a possible implementation method, the channel parameters include at least one of the following: power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device; the processing module is also used to: determine one or more path power differences according to the power of the multiple propagation paths, or determine one or more path eigenvalue differences according to the eigenvalues ​​of the multiple propagation paths, or determine one or more path singular value differences according to the singular values ​​of the multiple propagation paths; the transceiver module is specifically used to: when at least one path power difference among the one or more path power differences is greater than or equal to the path power difference threshold, or at least one path eigenvalue difference among the one or more path eigenvalue differences is greater than or equal to the path eigenvalue difference threshold, or at least one path singular value difference among the one or more path singular value differences is greater than or equal to the path Singular value difference threshold, send first information and second information to the second communication device, or send second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate to increase the power, eigenvalue or singular value of at least one propagation path; or, when each of the path power differences in one or more path power differences is less than the path power difference threshold, or each of the path eigenvalue differences in one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each of the path singular value differences in one or more path singular value differences is less than the path singular value difference threshold, send first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0077] Based on the seventh aspect, in a possible implementation manner, the second information includes the first rank, or includes an increase in the first rank compared to the rank indicated by the RI information.

[0078] Based on the seventh aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

[0079] Based on the seventh aspect, in a possible implementation method, when the first communication device sends first information and second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, or is used to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, or when the first communication device sends the second information, the transceiver module is also used to: send third information to the second communication device, and the third information is used to indicate a weighting coefficient matrix used for switching RIS.

[0080] Based on the seventh aspect, in a possible implementation, the transceiver module is also used to: receive a second reference signal from the second communication device through the RIS; the processing module is also used to: measure the second reference signal based on the first information and the second information, or measure the second reference signal based on the second information to obtain the first channel characteristic information, the first channel characteristic information is the channel characteristic information of the channel between the first communication device and the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; determine the first channel characteristic information according to the first channel information; the transceiver module is also used to: send the first channel characteristic information to the second communication device. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0081] Based on the seventh aspect, in a possible implementation method, the transceiver module is also used to: receive data from a second communication device, the data is sent according to a data transmission parameter, and the data transmission parameter is determined by the second communication device according to the first channel characteristic information.

[0082] An eighth aspect of the present application provides a second communication device, including:

[0083] A transceiver module is used to send a first reference signal to a first communication device through RIS; receive first information and / or second information from the first communication device, wherein the first information and / or second information is determined according to a channel parameter of a channel between the first communication device and the second communication device, the channel parameter is obtained by measuring the first reference signal, the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or, to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or, the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the second communication device. Optionally, RIS uses a unit weighting coefficient matrix for weighting.

[0084] Based on the eighth aspect, in a possible implementation manner, the second information includes the first rank, or includes an increase in the first rank relative to the rank indicated by the RI information.

[0085] Based on the eighth aspect, in a possible implementation method, the channel parameters include angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; the transceiver module is specifically used to: when at least one of the one or more path angle differences is less than or equal to a path angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to a path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than or equal to a path Doppler information difference threshold, receive the first information and the second information from the first communication device, or receive the second information from the first communication device; wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, and one or more path angle differences are determined based on the angles of multiple propagation paths. one or more path delay differences are determined based on the time delays of multiple propagation paths, and one or more path Doppler information differences are determined based on the Doppler information of multiple propagation paths; or, when each of the path angle differences in one or more path angle differences is greater than the path angle difference threshold, or when each of the path delay differences in one or more path delay differences is greater than the path delay difference threshold, or when each of the path Doppler information differences in one or more path Doppler information differences is greater than the path Doppler information difference threshold, the first information is received from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path angle differences are determined based on the angles of multiple propagation paths, one or more path delay differences are determined based on the time delays of multiple propagation paths, and one or more path Doppler information differences are determined based on the Doppler information of multiple propagation paths.

[0086] Based on the eighth aspect, in a possible implementation method, the channel parameters include at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the transceiver module is specifically used to: when at least one path correlation among one or more path correlations is greater than or equal to a path correlation threshold, receive first information and second information from the first communication device, or receive second information from the first communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, one or more The path correlation is determined based on at least one of the angles, powers, delays, and Doppler information of multiple propagation paths between the first communication device and the second communication device; or, when each of the one or more path correlations is less than a path correlation threshold, first information is received from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, and the one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0087] Based on the eighth aspect, in a possible implementation method, the channel parameters include at least one of the following: power, characteristic value or singular value of multiple propagation paths between the first communication device and the second communication device; the transceiver module is specifically used to: when at least one path power difference among one or more path power differences is greater than or equal to a path power difference threshold, or at least one path characteristic value difference among one or more path characteristic value differences is greater than or equal to a path characteristic value difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to a path singular value difference threshold, receive first information and second information from the first communication device, or receive second information from the first communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate to increase the power, characteristic value or singular value of at least one propagation path, and the one or more path power differences are determined based on the power of multiple propagation paths. determined, one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of multiple propagation paths; or, when each path power difference in one or more path power differences is less than a path power difference threshold, or each path eigenvalue difference in one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each path singular value difference in one or more path singular value differences is less than the path singular value difference threshold, first information is received from a first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path power differences are determined based on the powers of multiple propagation paths, one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of multiple propagation paths.

[0088] Based on the eighth aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

[0089] Based on the eighth aspect, in a possible implementation method, RIS uses a unit weighting coefficient matrix for weighting; when the second communication device receives the first information and the second information from the first communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in the power, eigenvalue or singular value of at least one propagation path; the transceiver module is also used to: receive the third information from the first communication device, and the third information is used to switch the weighting coefficient matrix used by RIS.

[0090] Based on the eighth aspect, in a possible implementation, the transceiver module is further used to: send a second reference signal to the first communication device through the RIS; receive first channel characteristic information from the first communication device, the first channel characteristic information is determined according to the first channel information, the first channel information is obtained by the first communication device measuring the second reference signal based on the first information and / or the second information, or the first channel information is obtained by the first communication device measuring the second reference signal based on the second information. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0091] Based on the eighth aspect, in a possible implementation method, the second communication device also includes a processing module; the processing module is used to determine the data transmission parameters according to the first channel characteristic information; the transceiver module is also used to: send data to the first communication device through the data transmission parameters.

[0092] A ninth aspect of the present application provides a first communication device, including:

[0093] A transceiver module, configured to receive a first reference signal from a second communication device via the RIS;

[0094] a processing module, configured to measure a first reference signal to obtain first channel characteristic information and second channel characteristic information, wherein the first channel characteristic information includes a first rank, the first rank is greater than the rank indicated by the RI information, and the second channel characteristic information is determined based on the first channel characteristic information;

[0095] The transceiver module is also used to send the first channel characteristic information and the second channel characteristic information to the second communication device.

[0096] Based on the ninth aspect, in a possible implementation manner, RIS uses a unit weighting coefficient matrix for weighting.

[0097] Based on the ninth aspect, in a possible implementation method, the transceiver module is also used to: send indication information to the second communication device, where the indication information is used to indicate that the second channel characteristic information is determined based on the first rank.

[0098] Based on the ninth aspect, in a possible implementation method, the processing module is also used to: measure the first reference signal to obtain channel parameters of the channel between the first communication device and the second communication device; and determine the first channel characteristic information according to the channel parameters.

[0099] Based on the ninth aspect, in a possible implementation method, the channel parameters include angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the processing module is also used to: determine one or more path angle differences based on the angles of the multiple propagation paths, or determine one or more path delay differences based on the delays of the multiple propagation paths, or determine one or more path Doppler information differences based on the Doppler information of the multiple propagation paths, wherein at least one of the one or more path angle differences is less than or equal to a path angle threshold, or the one or more path delay differences are less than or equal to a path delay difference threshold, or the one or more path Doppler information differences are less than or equal to a path Doppler information difference.

[0100] Based on the ninth aspect, in a possible implementation method, the channel parameters include angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the processing module is also used to: determine one or more path correlations based on at least one item of the angles, powers, delays, and Doppler information of the multiple propagation paths, wherein at least one of the one or more path correlations is less than or equal to a path correlation threshold, or at least one of the one or more path correlations is greater than the path correlation threshold.

[0101] Based on the ninth aspect, in a possible implementation method, the channel parameters include power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device; the processing module is also used to: determine one or more path power differences based on the power of the multiple propagation paths, or determine one or more path eigenvalue differences based on the eigenvalues ​​of the multiple propagation paths, or determine one or more path singular value differences based on the singular values ​​of the multiple propagation paths; wherein, when at least one of the one or more path power differences is greater than or equal to a path power difference threshold, or at least one of the one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one of the one or more path singular value differences is greater than or equal to a path singular value difference threshold.

[0102] Based on the ninth aspect, in a possible implementation, the value of the first rank belongs to the interval (K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device.

[0103] Based on the ninth aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting; the transceiver module is also used to: send switching information to the second communication device, the switching information is used to indicate switching the weighting coefficient matrix used by the RIS.

[0104] Based on the ninth aspect, in a possible implementation, the transceiver module is further used to: receive data from the second communication device through the RIS, the data is sent according to the data transmission parameter, and the data transmission parameter is determined according to the first channel characteristic information and the second channel characteristic information. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0105] A tenth aspect of the present application provides a second communication device, including:

[0106] The transceiver module is used to send a first reference signal to a first communication device through RIS; receive first channel characteristic information and second channel characteristic information from the first communication device, the first channel characteristic information includes a first rank, the first rank is greater than the rank indicated by the RI information, and the second channel characteristic information is determined based on the first channel characteristic information.

[0107] Based on the tenth aspect, in a possible implementation manner, RIS uses a unit weighting coefficient matrix for weighting.

[0108] Based on the tenth aspect, in a possible implementation manner, the first channel characteristic information is determined based on a channel parameter between the first communication device and the second communication device.

[0109] Based on the tenth aspect, in a possible implementation, the channel parameters include angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; at least one of the one or more path angle differences is less than or equal to the path angle threshold, or the one or more path delay differences are less than or equal to the path delay difference threshold, or the one or more path Doppler information differences are less than or equal to the path Doppler information difference. Alternatively, at least one of the one or more path angle differences is less than the path angle threshold, or the one or more path delay differences are less than the path delay difference threshold, or the one or more path Doppler information differences are less than the path Doppler information difference. The one or more path angle differences are determined based on the angles of the multiple propagation paths, the one or more path delay differences are determined based on the delays of the multiple propagation paths, and the one or more path Doppler information differences are determined based on the Doppler information of the multiple propagation paths.

[0110] Based on the tenth aspect, in a possible implementation method, the channel parameters include angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, or at least one path correlation among the one or more path correlations is greater than a path correlation threshold, and the one or more path correlations are determined based on at least one item of the angles, powers, delays, and Doppler information of the multiple propagation paths.

[0111] Based on the tenth aspect, in a possible implementation method, the channel parameters include power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device; when at least one path power difference among one or more path power differences is greater than or equal to a path power difference threshold, or at least one path eigenvalue difference among one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to a path singular value difference threshold, the one or more path power differences are determined based on the power of the multiple propagation paths, the one or more path eigenvalue differences are determined based on the eigenvalues ​​of the multiple propagation paths, and the one or more path singular value differences are determined based on the singular values ​​of the multiple propagation paths.

[0112] Based on the tenth aspect, in a possible implementation method, the transceiver module is also used to: receive indication information from the first communication device, where the indication information is used to indicate that the second channel characteristic information is determined based on the first rank.

[0113] Based on the tenth aspect, in a possible implementation, the value of the first rank belongs to the interval (K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device.

[0114] Based on the tenth aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting; the transceiver module is also used to: receive switching information from the first communication device, the switching information is used to indicate the weighting coefficient matrix used by the switching RIS.

[0115] Based on the tenth aspect, in a possible implementation, the second communication device further includes a processing module, the processing module is used to determine the data transmission parameter according to the first channel characteristic information and the second channel characteristic information; the transceiver module is further used to: send data to the first communication device through the RIS according to the data transmission parameter. Optionally, the RIS uses a non-unit weighting coefficient matrix.

[0116] In an eleventh aspect of the present application, a first communication device is provided, including:

[0117] A transceiver module, configured to receive a first reference signal from a second communication device via the RIS;

[0118] a processing module, configured to measure a first reference signal to obtain a channel characteristic of a channel between the first communication device and the second communication device, wherein the channel characteristic is obtained by measuring the first reference signal based on the first information and / or the second information, wherein the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or to indicate whether to increase the power, eigenvalue, or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is a propagation path between the first communication device and the second communication device;

[0119] The transceiver module is also used to send first channel characteristic information to the second communication device; wherein the first channel characteristic information includes channel characteristics and status information, and the status information is used to indicate that the channel characteristics are obtained based on the first information and / or the second information; or, the first channel characteristic information includes the first information and / or the second information, and the channel characteristics.

[0120] Based on the eleventh aspect, in a possible implementation manner, RIS uses a weighting coefficient matrix for weighting.

[0121] Based on the eleventh aspect, in a possible implementation manner, the processing module is also used to: determine the first information and / or the second information according to a channel parameter of a channel between the first communication device and the second communication device, where the channel parameter is obtained by measuring the first reference signal.

[0122] Based on the eleventh aspect, in a possible implementation method, the channel parameters include: angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; the processing module is specifically used to: determine one or more path angle differences according to the angles of the multiple propagation paths, or, determine one or more path delay differences according to the delays of the multiple propagation paths, or, determine one or more path Doppler information differences according to the Doppler information of the multiple propagation paths; when at least one of the one or more path angle differences is less than or equal to the path angle threshold, or when at least one of the one or more path delay differences is less than or equal to the path delay difference Threshold, or, when at least one of the one or more path Doppler information differences exists and is less than or equal to the path Doppler information difference threshold, determine the first information and the second information, or determine the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each of the one or more path angle differences is greater than the path angle threshold, determine the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0123] Based on the eleventh aspect, in a possible implementation method, the channel parameters include at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the processing module is specifically used to: determine one or more path correlations based on at least one of the angles, powers, delays, and Dopplers of the multiple propagation paths; when at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, determine the first information and the second information, or determine the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate an increase in the power, eigenvalue, or singular value of at least one propagation path; or, when each of the one or more path correlations is less than the path correlation threshold, determine the first information, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue, or singular value of at least one propagation path.

[0124] Based on the eleventh aspect, in a possible implementation method, the channel parameters include at least one of the following: power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device; the processing module is specifically used to: determine one or more path power differences according to the power of the multiple propagation paths, or determine one or more path characteristic value differences according to the characteristic values ​​of the multiple propagation paths, or determine one or more path singular value differences according to the singular values ​​of the multiple propagation paths; when at least one path power difference among the one or more path power differences is greater than or equal to a path power difference threshold, or at least one path characteristic value difference among the one or more path characteristic value differences is greater than or equal to a path characteristic value difference threshold, or at least one path singular value difference among the one or more path singular value differences is greater than or equal to a path characteristic value difference threshold When the value difference is greater than or equal to the path singular value difference threshold, the first information and the second information are determined, or the second information is determined, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each of the path power differences in one or more path power differences is less than the path power difference threshold, or each of the path eigenvalue differences in one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each of the path singular value differences in one or more path singular value differences is less than the path singular value difference threshold, the first information is determined, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or is used to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0125] Based on the eleventh aspect, in a possible implementation manner, the second information includes the first rank, or includes an increase in the first rank compared to the rank indicated by the RI information.

[0126] Based on the eleventh aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

[0127] Based on the eleventh aspect, in a possible implementation method, RIS uses a unit weighting coefficient matrix for weighting; the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path; the transceiver module is also used to: send third information to the second communication device, and the third information is used to indicate the weighting coefficient matrix used for switching RIS.

[0128] Based on the eleventh aspect, in a possible implementation, the transceiver module is further used to: receive data from the second communication device through the RIS, the data is sent according to the data transmission parameter, and the data transmission parameter is determined according to the first channel characteristic information. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0129] A twelfth aspect of the present application provides a second communication device, including:

[0130] A transceiver module is used to send a first reference signal to a first communication device through a RIS; receive first channel characteristic information from the first communication device, the first channel characteristic information including channel characteristics and state information, or the first channel characteristic information including first information and / or second information, and channel characteristics; wherein the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information; the state information is used to indicate that the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information; the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the second communication device.

[0131] Based on the twelfth aspect, in a possible implementation manner, RIS uses a weighting coefficient matrix for weighting.

[0132] Based on the twelfth aspect, in a possible implementation manner, the first information and / or the second information is determined based on a channel parameter of a channel between the first communication device and the second communication device, and the channel parameter is obtained by measuring a first reference signal.

[0133] Based on the twelfth aspect, in a possible implementation method, the channel parameters include angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; when at least one of the one or more path angle differences is less than or equal to a path angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to a path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than or equal to a path Doppler information difference threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, one or more path angle differences are determined based on the angles of the multiple propagation paths, and one or more path delay differences are determined based on the multiple propagation paths. The first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path angle differences are determined according to the angles of multiple propagation paths, one or more path delay differences are determined according to the delays of multiple propagation paths, and one or more path Doppler information differences are determined according to the Doppler information of multiple propagation paths; or, when each path angle difference in one or more path angle differences is greater than a path angle difference threshold, or when each path delay difference in one or more path delay differences is greater than a path delay difference threshold, or when each path Doppler information difference in one or more path Doppler information differences is greater than a path Doppler information difference threshold, the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path angle differences are determined according to the angles of multiple propagation paths, one or more path delay differences are determined according to the delays of multiple propagation paths, and one or more path Doppler information differences are determined according to the Doppler information of multiple propagation paths.

[0134] Based on the twelfth aspect, in a possible implementation method, the channel parameters include at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; when at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate to increase the power, eigenvalue or singular value of at least one propagation path, and the one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of the multiple propagation paths between the first communication device and the second communication device; or, when each of the one or more path correlations is less than the path correlation threshold, the first information is used to indicate not to enhance the rank indicated by the RI information, and / or to indicate not to increase the power, eigenvalue or singular value of at least one propagation path, and the one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of the multiple propagation paths between the first communication device and the second communication device.

[0135] Based on the twelfth aspect, in a possible implementation method, the channel parameters include at least one of the following: power, eigenvalues ​​or singular values ​​of multiple propagation paths between the first communication device and the second communication device; when at least one path power difference among one or more path power differences is greater than or equal to a path power difference threshold, or at least one path eigenvalue difference among one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to a path singular value difference threshold, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path, one or more path power differences are determined based on the powers of multiple propagation paths, and one or more path eigenvalue differences are determined based on The first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path power differences are determined based on the powers of the multiple propagation paths, one or more path eigenvalue differences are determined based on the eigenvalues ​​of the multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of the multiple propagation paths; or, when each path power difference in one or more path power differences is less than a path power difference threshold, or each path eigenvalue difference in one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each path singular value difference in one or more path singular value differences is less than the path singular value difference threshold, the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, one or more path power differences are determined based on the powers of the multiple propagation paths, one or more path eigenvalue differences are determined based on the eigenvalues ​​of the multiple propagation paths, and one or more path singular value differences are determined based on the singular values ​​of the multiple propagation paths.

[0136] Based on the twelfth aspect, in a possible implementation manner, the second information includes the first rank, or includes an increase in the first rank relative to the rank indicated by the RI information.

[0137] Based on the twelfth aspect, in a possible implementation, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

[0138] Based on the twelfth aspect, in a possible implementation method, RIS uses a unit weighting coefficient matrix for weighting; the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path; the transceiver module is also used to: receive third information from the first communication device, and the third information is used to switch the weighting coefficient matrix used by RIS.

[0139] Based on the twelfth aspect, in a possible implementation, the second communication device further includes a processing module, which is configured to determine data transmission parameters according to the first channel characteristic information; the transceiver module is further configured to: transmit data to the first communication device via the RIS according to the data transmission parameters. Optionally, the RIS uses a non-identity weighting coefficient matrix for weighting.

[0140] The thirteenth aspect of this application provides a communication device, which includes: a processor and a memory. A computer program or computer instructions are stored in the memory, and the processor is configured to call and run the computer program or computer instructions stored in the memory, so that the processor implements any one of the implementations in any one of the first aspect to the sixth aspect.

[0141] Optionally, the communication device further includes a transceiver, and the processor is configured to control the transceiver to transmit and receive signals.

[0142] The fourteenth aspect of this application provides a communication device, including a processor and an interface circuit. The processor is configured to communicate with other devices through the interface circuit and execute the method described in any one of the first aspect to the sixth aspect above. The processor includes one or more.

[0143] The fifteenth aspect of this application provides a communication device, including a processor, which is configured to be connected to a memory and call the program stored in the memory to execute the method described in any one of the first aspect to the sixth aspect above. The memory can be located inside the communication device or outside the communication device. And the processor includes one or more.

[0144] In one implementation, the communication devices in the seventh aspect to the twelfth aspect above can be a chip or a chip system.

[0145] The sixteenth aspect of this application provides a computer program product including computer instructions, which is characterized in that when it runs on a computer, it causes the computer to execute any one of the implementations in any one of the first aspect to the sixth aspect.

[0146] The seventeenth aspect of this application provides a computer-readable storage medium, including computer instructions, which when running on a computer, cause the computer to execute any one of the implementations in any one of the first aspect to the sixth aspect.

[0147] The eighteenth aspect of this application provides a chip device, including a processor, which is configured to call computer programs or computer instructions in a memory so that the processor executes any one of the implementations in any one of the first aspect to the sixth aspect above.

[0148] Optionally, the processor is coupled to the memory through an interface.

[0149] In the nineteenth aspect of the present application, a communication system is provided, which includes a first communication device and a second communication device; the first communication device is used to execute the method as shown in the first aspect, and the second communication device is used to execute the method as shown in the second aspect; or, the first communication device is used to execute the method as shown in the third aspect, and the second communication device is used to execute the method as shown in the fourth aspect; or, the first communication device is used to execute the method as shown in the fifth aspect, and the second communication device is used to execute the method as shown in the sixth aspect.

[0150] It can be known from the above technical solution that the first communication device receives the first reference signal from the second communication device through the RIS. Then, the first communication device measures the first reference signal to obtain the channel parameters of the channel between the first communication device and the second communication device. The first communication device sends the first information and / or the second information to the second communication device. It can be known that in the technical solution of the present application, the first communication device determines the first information and / or the second information according to the channel parameters, and sends the first information and / or the second information to the second communication device. Among them, the first information and / or the second information are determined according to the channel parameters, and the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path. The second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path. The first rank is greater than or equal to the rank indicated by the RI information, and at least one propagation path is the propagation path between the first communication device and the second communication device. Thereby avoiding the problem that the rank used for communication in some scenarios leads to a sharp decline in system performance gain. It is beneficial to improve system capacity and thus ensure communication performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0151] Figure 1A A schematic diagram of a communication system according to an embodiment of the present application;

[0152] Figure 1B This is another schematic diagram of an embodiment of the communication system of the present application;

[0153] Figure 1C A schematic diagram of another embodiment of the communication system of the present application;

[0154] Figure 1D A schematic diagram of another embodiment of the communication system of the present application;

[0155] Figure 1E A schematic diagram of another embodiment of the communication system of the present application;

[0156] Figure 1F A schematic diagram of another embodiment of the communication system of the present application;

[0157] Figure 2 A schematic diagram of an embodiment of the information sending method and the information receiving method of the embodiment of the present application;

[0158] Figure 3A A schematic diagram of bits occupied by first information and bits occupied by second information in an embodiment of the present application;

[0159] Figure 3B A schematic diagram of a scenario of the information sending method and the information receiving method according to an embodiment of the present application;

[0160] Figure 4 It is a schematic diagram of another embodiment of the information sending method and the information receiving method of the embodiment of the present application;

[0161] Figure 5 A schematic diagram of another embodiment of the information sending method and the information receiving method of the embodiment of the present application;

[0162] Figure 6 A schematic diagram of the structure of a communication device according to an embodiment of the present application;

[0163] Figure 7 This is another schematic diagram of the structure of the communication device according to the embodiment of the present application;

[0164] Figure 8 A schematic diagram of the structure of a terminal device according to an embodiment of the present application;

[0165] Fig. 9 A structural diagram of a network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0166] The embodiments of the present application provide an information sending method, an information receiving method and a related device, which are used for a first communication device to send first information and / or second information to a second communication device. This avoids the problem that in some scenarios, enhancing the rank used for communication leads to a sharp decrease in system performance gain. This is conducive to improving system capacity, thereby ensuring communication performance.

[0167] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0168] References to "one embodiment" or "some embodiments" etc. described in this application mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0169] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c; a and b; a and c; b and c; or a, b, and c. Among them, a, b, and c can be single or multiple.

[0170] It can be understood that in this application, "indication" can include direct indication, indirect indication, explicit indication, implicit indication. When describing that a certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0171] The technical solution of the present application can be applied to various communication systems. For example, the fifth generation mobile communication (5th Generation, 5G) system, the new wireless (New Radio, NR) system, the long term evolution (Long Term Evolution, LTE) system, the LTE frequency division duplex (FDD) system, the LTE time division duplex (TDD), the universal mobile telecommunication system (UMTS), the mobile communication system after the 5G network (for example, the 6G mobile communication system), the vehicle network (Vehicle To Everything, V2X) communication system, the device to device (Device To Device, D2D) communication system, the Internet of Things communication system, the industrial Internet communication system, or the satellite communication system. The wireless communication system involved in the present application also includes but is not limited to: the narrowband Internet of Things system (NB-IoT).

[0172] MIMO technology utilizes resources in the spatial dimension. Without increasing the system bandwidth, the signal can obtain array gain, multiplexing and diversity gain, and interference cancellation gain in space, thereby exponentially increasing the capacity and spectrum efficiency of the communication system. Therefore, since its introduction, it has been one of the most typical and effective solutions to overcome non-ideal characteristics such as fading and inter-code interference caused by more complex and diverse communication environments, and has been favored by wireless communication researchers. However, with the continuous improvement of people's requirements for high-speed, high-reliability, and low-latency communications, modern communication systems will continue to face the challenges of greater capacity, wider coverage, and lower latency, and these requirements have also become key requirements for the next generation of communication systems.

[0173] In the complex evolution of wireless communication systems, high throughput and large connections have always been the core challenges and goals of wireless communication networks. In order to meet the above challenges, various technological innovations have emerged one after another, but increasingly complex systems are facing challenges in implementation complexity, system energy consumption, and strengthening the utilization and control of spatial channels.

[0174] To address the above challenges, reconfigurable intelligent surfaces (RIS) have been widely studied as a technology with great potential. Reconfigurable intelligent reflective surfaces can also be called intelligent reflecting surfaces (IRS) or large intelligent surfaces (LIS). For example, RIS-assisted networks that control channel characteristics through RIS elements are considered to be a key enabling technology for expanding the coverage of wireless communication networks.

[0175] RIS is a sub-wavelength artificial two-dimensional material, usually composed of metal, dielectric and adjustable elements, which can be equivalently characterized as a resistance inductance capacitance resonant circuit (RLC) circuit. By adjusting the physical properties of the electromagnetic unit (such as capacitive reactance, impedance or inductive reactance), the radiation characteristics of RIS can be changed to achieve unconventional physical phenomena such as irregular reflection, negative refraction, wave absorption, focusing and polarization conversion, thereby dynamically regulating electromagnetic waves. RIS generates the electromagnetic behavior required by each electromagnetic unit by controlling the bias voltage of varactor diodes, positive and negative photodiodes (PIN) switches, microelectromechanical systems (MEMS) switches, liquid crystals, or graphene.

[0176] Specifically, the RIS reflector panel is an intelligent panel including multiple antenna arrays, each of which is a low-cost passive reflector. By flexibly configuring the amplitude and phase of each antenna array, the purpose of controlling the fading of the wireless channel and forming the desired directional beam can be achieved. RIS can be installed on large planes (e.g., indoor walls or ceilings, outdoor buildings or signs) to reflect RF energy around obstacles and create a virtual line-of-sight propagation path between the communication source and the target.

[0177] The application scenarios of RIS are coverage enhancement and blind spot filling. For example, deploying one or more RIS at the edge of a cell, or in a coverage blind spot caused by occlusion or deep attenuation, can extend coverage and fill in blind spots. Another potential application scenario of RIS is rank increase. Based on RIS, channels can be actively changed, and more transmission paths with controllable gains can be provided. RIS can be used between network devices and terminal devices to actively control the quality of the wireless channel between network devices and terminal devices. For example, enhancing link gain, increasing the number of characteristic subchannels, etc. RIS improving the rank used for communication has also become a valuable scenario. The technical solution of the present application mainly uses RIS to enhance the rank used for communication, thereby improving the system performance gain.

[0178] The communication system to which the technical solution provided in the present application is applicable includes a first communication device and a second communication device. The first communication device is a network device, and the second communication device is a terminal device; or the first communication device is a terminal device, and the second communication device is a network device.

[0179] Combine the following Figures 1A to 1F Some possible communication systems to which this application is applicable are introduced. This application is still applicable to other communication systems, and this application does not make specific limitations.

[0180] Figure 1A This is a schematic diagram of a communication system according to an embodiment of the present application. Figure 1A The communication system includes a base station 101, a terminal device 102 and a RIS 103. The base station 101 can send a signal to the terminal device 102 via the RIS 103. The first communication device can be the terminal device 102, and the second communication device can be the base station 101. The technical solution of the present application can be implemented between the base station 101 and the terminal device 102.

[0181] Figure 1B This is another embodiment schematic diagram of the communication system of the present application embodiment. Figure 1B , the communication system and Figure 1A Compared with the communication system shown in FIG. 1 , the difference is that RIS 103 is deployed in base station 101, and the signal sent by base station 101 passes through RIS 103 and then is reflected by the scatterer to terminal device 102. It should be noted that Figure 1B The form in which RIS103 is deployed in base station 101 is only an example. In actual application, there may be other deployment forms. RIS103 may be a layer of reflective film, which is attached to the antenna of base station 101, and the present application does not make any specific limitation.

[0182] Figure 1C This is another embodiment of the communication system of the present application. Figure 1C , the communication system and Figure 1ACompared with the communication system shown in FIG. 1 , the difference is that RIS 103 is deployed in the terminal device 102, and the signal sent by the base station 101 is reflected by the scatterer to RIS 103, and then to the terminal device 102 through RIS 103. It should be noted that Figure 1C The form in which the RIS 103 is deployed in the terminal device 102 is only an example. In actual applications, there may be other deployment forms. The RIS 103 may be a layer of reflective film, which is attached to the antenna of the terminal device 102, and the specific application does not limit it.

[0183] Figure 1D This is another embodiment of the communication system of the present application. Figure 1D The communication system includes a base station 101, a terminal device 102 and a RIS 103. The terminal device 102 can send a signal to the base station 101 through the RIS 103. The first communication device can be the base station 101, and the second communication device can be the terminal device 102. The technical solution of the present application can be implemented between the base station 101 and the terminal device 102.

[0184] Figure 1E This is another embodiment of the communication system of the present application. Figure 1E , the communication system and Figure 1D Compared with the communication system shown in FIG. 1 , the difference is that RIS 103 is deployed in base station 101. The signal sent by terminal device 102 is reflected by the scatterer to RIS 103, and then reflected by RIS 103 to base station 101. It should be noted that Figure 1E The form in which RIS103 is deployed in base station 101 is only an example. In actual application, there may be other deployment forms. RIS103 may be a layer of reflective film, which is attached to the antenna of base station 101, and the present application does not make any specific limitation.

[0185] Figure 1F This is another embodiment of the communication system of the present application. Figure 1F , the communication system and Figure 1D Compared with the communication system shown in FIG. 1 , the difference is that RIS 103 is deployed in terminal device 102, and the signal transmitted by terminal device 102 passes through RIS 103 and then is reflected by the scatterer to base station 101. It should be noted that Figure 1F The form in which the RIS 103 is deployed in the terminal device 102 is only an example. In actual applications, there may be other deployment forms. The RIS 103 may be a layer of reflective film, which is attached to the antenna of the terminal device 102, and the specific application does not limit it.

[0186] The network equipment and terminal equipment involved in this application are introduced below.

[0187] The terminal device may be a wireless terminal device capable of receiving network device scheduling information and indication information. The terminal device may be a device that provides voice and / or data connectivity to a user, or a handheld device with wireless connection function, or other processing device connected to a wireless modem.

[0188] Terminal equipment, also known as User Equipment (UE), Mobile Station (MS), Mobile Terminal (MT), Customer Premise Equipment (CPE), etc. Terminal equipment is a device that includes wireless communication functions (providing voice / data connectivity to users). For example, a handheld device with wireless connection function, or a vehicle-mounted device, etc. At present, some examples of terminal equipment are: mobile phones (MobilePhone), tablet computers, laptops, PDAs, mobile Internet devices (Mobile Internet Device, MID), wearable devices, virtual reality (Virtual Reality, VR) equipment, augmented reality (Augmented Reality, AR) equipment, wireless terminals in industrial control (Industrial Control), wireless terminals in Internet of Vehicles, wireless terminals in self-driving (Self Driving), wireless terminals in remote medical surgery (Remote Medical Surgery), wireless terminals in smart grids (Smart Grid), wireless terminals in transportation safety (Transportation Safety), wireless terminals in smart cities (Smart City), or wireless terminals in smart homes (Smart Home), etc. For example, the wireless terminal in unmanned driving can be a drone, helicopter, or airplane. For example, the wireless terminal in the Internet of Vehicles can be a vehicle-mounted device, vehicle equipment, vehicle-mounted module, vehicle, or ship. The wireless terminal in industrial control can be a camera, robot, or robotic arm. The wireless terminal in a smart home can be a TV, air conditioner, sweeper, speaker, or set-top box.

[0189] It should be noted that the terminal device can be a device or apparatus with a chip, or a device or apparatus with an integrated circuit, or a chip, chip system, module or control unit in the device or apparatus shown above, and this application does not limit it. It should be noted that in this application, when referring to the terminal device, it can refer to the terminal device itself, or it can refer to the chip, functional module or integrated circuit in the terminal device that completes the method provided in this application, and this application does not limit it.

[0190] A network device may be a device in a wireless network. For example, a network device may be a device deployed in a wireless access network to provide wireless communication functions for a terminal device. For example, a network device may be a radio access network (RAN) node that connects a terminal device to a wireless network, and may also be referred to as an access network device, a RAN entity, an access node, a network node, or a communication device.

[0191] Specifically, the network device may be an access network device for a cellular system related to the 3rd Generation Partnership Project (3GPP). For example, a 4G communication system, or a 5G communication system. The network device may also be an access network device in an open access network (Open RAN, O-RAN or ORAN) or a cloud radio access network (Cloud Radio Access Network, CRAN). Alternatively, the network device may also be an access network device in a communication system obtained by integrating two or more of the above communication systems.

[0192] The network equipment includes, but is not limited to: Evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), Home Base Station (e.g., Home Evolved Node B, or Home Node B, HNB), Baseband Unit (BBU), Access Point (AP) in Wireless Fidelity (WIFI) system, Macro Base Station, Micro Base Station, Wireless Relay Node, Donor Node, Wireless Controller in CRAN scenario, Wireless Backhaul Node, Transmission Point (TP) or Transmission And Receiving Point (TRP), etc., and can also be network equipment in 5G mobile communication system. For example, the next generation NodeB (gNB), TRP, TP in the NR system; or, one or a group of antenna panels (including multiple antenna panels) of the base station in the 5G mobile communication system; or, the network device can also be a network node constituting a gNB or a transmission point. For example, a centralized unit (CU), a distributed unit (DU), a centralized unit-control plane (CU-CP), a centralized unit-user plane (CU-UP), or a radio unit (RU). CU and DU can be set separately, or can also be included in the same network element, such as BBU. RU can be included in a radio frequency device or a radio frequency unit. For example, in a remote radio unit (RRU), an active antenna processing unit (AAU), or a remote radio head (RRH). Alternatively, the network device can also be a server, a wearable device, a vehicle or an on-board device, etc. For example, the access network device in the V2X technology may be a road side unit (RSU).

[0193] It should be noted that in different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an open access network (Open Radio Access Network, ORAN) system, CU may also be referred to as an open centralized unit (Open Centralized Unit, O-CU) or an open CU, DU may also be referred to as an open distributed unit (Open Distributed Unit, O-DU), CU-CP may also be referred to as an open-centralized unit-control plane (Open Centralized Unit Control Plane, O-CU-CP), CU-UP may also be referred to as an open-centralized unit-user plane (Open Centralized Unit User Plane, O-CU-UP), and RU may also be referred to as an open radio unit (Open Radio Unit, O-RU), which is not specifically limited in this application. Any of the CU, CU-CP, CU-UP, DU and RU in this application may be implemented together by a software module, a hardware module, or a combination of a software module and a hardware module.

[0194] Optionally, for network elements in the ORAN system, each network element may implement the protocol layer functions shown in Table 1 below.

[0195] Table 1

[0196]

[0197] It should be noted that, in the ORAN system, the network device in the present application may be one or more network elements in Table 1 above.

[0198] The following describes the architecture of the CU and DU of the access network device. The access network device includes at least one CU and at least one DU. Optionally, the access network device also includes at least one RU.

[0199] The following is an introduction using an access network device including a CU and a DU as an example. The CU has some functions of the core network, and the CU may include a CU-CP and a CU-UP. The CU and the DU may be configured according to the protocol layer functions of the wireless network they implement. For example, the CU is configured to implement the functions of the packet data convergence layer protocol (Packet Data Convergence Protocol, PDCP) layer and above protocol layers (for example, the RRC layer and / or the SDAP layer). The DU is configured to implement the functions of the protocol layers below the PDCP layer (for example, the RLC layer, the MAC layer, and / or the physical (Physical, PHY) layer). For another example, the CU is configured to implement the functions of the protocol layers above the PDCP layer (such as the RRC layer and / or the SDAP layer), and the DU is configured to implement the functions of the PDCP layer and the protocol layers below (for example, the RLC layer, the MAC layer, and / or the PHY layer, etc.).

[0200] When the CU includes a CU-CP and a CU-UP, the CU-CP is used to implement the control plane function of the CU, and the CU-UP is used to implement the user plane function of the CU. For example, when the CU is configured to implement the functions of the PDCP layer, the RRC layer, and the SDAP layer, the CU-CP is used to implement the control plane function of the RRC layer and the PDCP layer, and the CU-UP is used to implement the user plane function of the SDAP layer and the PDCP layer.

[0201] CU-CP can interact with network elements in the core network for implementing control plane functions. The network elements in the core network for implementing control plane functions can be access and mobility function network elements, such as the access and mobility function (AMF) in the 5G system. The access and mobility function network element is responsible for mobility management in the mobile network, such as location update of terminal devices, registration network of terminal devices, switching of terminal devices, etc.

[0202] CU-UP can interact with network elements in the core network that are used to implement user plane functions. Network elements in the core network that are used to implement user plane functions, such as the User Plane Function (UPF) in the 5G system, are responsible for forwarding and receiving data in terminal devices.

[0203] The above configuration of CU and DU is only an example, and the functions of CU and DU can also be configured as needed. For example, the CU or DU can be configured to have the functions of more protocol layers, or the CU or DU can be configured to have partial processing functions of the protocol layer. For example, some functions of the RLC layer and the functions of the protocol layers above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are set in the DU. For another example, the functions of the CU or DU can be divided according to the service type or other system requirements. For example, by delay, the functions that need to meet the smaller delay requirements for processing time are set in the DU, and the functions that do not need to meet the delay requirements are set in the CU.

[0204] DU and RU can cooperate to jointly implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of DU and RU can be configured in a variety of ways according to the design. For example, DU is configured to implement baseband functions, and RU is configured to implement mid-RF functions. For another example, DU is configured to implement high-level functions in the PHY layer, and RU is configured to implement low-level functions in the PHY layer or to implement the low-level functions and RF functions. The high-level functions in the physical layer may include a part of the functions of the physical layer, which is closer to the MAC layer, and the low-level functions in the physical layer may include another part of the functions of the physical layer, which is closer to the mid-RF side.

[0205] It should be noted that the network device can be a device or apparatus with a chip, or a device or apparatus with an integrated circuit, or a chip, chip system, module or control unit in the aforementioned device or apparatus, and this application does not limit it. It should be noted that in this application, when referring to a network device, it can refer to the network device itself, or it can refer to a chip, functional module or integrated circuit in the network device that completes the method provided in this application, and this application does not limit it.

[0206] like Figure 1AAs shown, based on the active change of the channel by RIS103, more gain-controllable channels are provided. The channel from the base station 101 to the terminal device 102 is represented as H0, the channel from the base station 101 to the RIS103 is represented as H1, and the channel between the RIS103 and the terminal device 102 is represented as H2. Then the signal received by the terminal device 102 can be expressed as Y=H0+H1*W*H2, where W is the weighting coefficient matrix used by RIS103. It is not difficult to find that compared with the traditional H0 channel, RIS provides an additional H1*W*H2 channel to improve the rank used for communication. However, the system performance gain is only improved when the channel quality of the H0 channel is poor. When the channel quality of the H0 channel is good, the system performance gain not only cannot be improved, but it drops sharply. It can be seen from this that the system performance gain of the above technical solution cannot be improved in some scenarios, but the system performance gain drops sharply, resulting in a decrease in system capacity and a decrease in communication performance.

[0207] The present application provides a corresponding technical solution, in which a first communication device sends first information and / or second information to a second communication device. The first channel and / or the second channel are determined according to the channel parameters of the channel between the first communication device and the second communication device. This avoids the problem that in some scenarios, enhancing the rank used for communication leads to a sharp decrease in system performance gain. This is conducive to improving system capacity, thereby ensuring communication performance. For details, please refer to the relevant introduction of the embodiments below.

[0208] In this application, the name of RIS is not limited and can be other names. For example, RIS can also be called a configurable hypersurface, a meta-surface, or a super-surface, which is not limited in this application. RIS is essentially a reflective surface that can be deployed on a network device or a terminal device.

[0209] The technical solution of the present application is introduced below in conjunction with specific embodiments.

[0210] Figure 2 This is a schematic diagram of an embodiment of the information sending method and information receiving method of the present application. Figure 2 , methods include:

[0211] 201. A second communication device sends a first reference signal to a first communication device via a RIS. Correspondingly, the first communication device receives the first reference signal from the second communication device via the RIS.

[0212] Optionally, the RIS uses a unit weighting coefficient matrix for weighting. The method is applied to a communication system, the communication system includes the RIS, and the RIS uses a unit weighting coefficient matrix for weighting. For example, Figure 1AAs shown, the first communication device is a base station 101, and the second communication device is a terminal device 102. The base station 101 sends a first reference signal to the terminal device 102 via the RIS 103.

[0213] Optionally, the RIS can be deployed independently of the first communication device and the second communication device, or can be deployed on the first communication device, or can be deployed on the second communication device, which is not limited in this application. For example, the RIS can be a reflective layer, which is attached to the antenna of the first communication device, or the reflective layer is attached to the antenna of the second communication device. The name of the RIS is not limited. For example, the RIS can also be called a metasurface, a hypersurface, or a reflective surface, etc., which is not limited in this application.

[0214] In one possible implementation, the first communication device is a terminal device, the second communication device is a network device, and the first reference signal may be a first channel state information reference signal (CSI-RS). In another possible implementation, the first communication device is a network device, the second communication device is a terminal device, and the first reference signal may be a first sounding reference signal (SRS).

[0215] Optionally, the second communication device sends the first reference signal to the first communication device via the RIS according to a preset period. Correspondingly, the first communication device receives the first reference signal from the second communication device via the RIS according to a preset period.

[0216] 202. A first communication device measures a first reference signal to obtain a channel parameter of a channel between the first communication device and a second communication device.

[0217] Optionally, the channel parameters include at least one of the following: angles, powers, eigenvalues, singular values, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0218] Optionally, the angles of the multiple propagation paths include at least one of the following: a horizontal angle of arrival (Azimuth of Arrival, AOA), a horizontal angle of departure (Azimuth of Departure, AOD), a vertical angle of arrival (Zenith of Arrival, ZOA), or a vertical angle of departure (Zenith of Departure, ZOD) of the multiple propagation paths.

[0219] Optionally, the eigenvalues ​​of the multiple propagation paths are obtained by performing eigenvalue decomposition on a channel corresponding to each of the multiple propagation paths. The singular values ​​of the multiple propagation paths are obtained by performing singular value decomposition on a channel corresponding to each of the multiple propagation paths.

[0220] Optionally, the time delay of the multiple propagation paths includes an average time delay or a statistical time delay of each of the multiple propagation paths. The Doppler information of the multiple propagation paths includes a Doppler average value or a Doppler statistical value of each of the multiple propagation paths.

[0221] The multiple propagation paths may include a line of sight (LOS) path and a non-line of sight (NLOS) path between the first communication device and the second communication device. The NLOS path may include a propagation path between the first communication device and the second communication device that passes through the RIS, and / or a propagation path between the first communication device and the second communication device that does not pass through the RIS. When the RIS is deployed on the first communication device or the second communication device, the multiple propagation paths all pass through the RIS.

[0222] Optionally, the first communication device measures the first reference signal according to a preset period. Figure 3B As shown, the first communication device can measure the first reference signal according to the measurement period of the first reference signal.

[0223] 203. The first communication device sends the first information and / or the second information to the second communication device. Correspondingly, the second communication device receives the first information and / or the second information from the first communication device.

[0224] The first information and / or the second information is determined according to a channel parameter.

[0225] The first information is used to indicate whether to enhance the rank indicated by the RI information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path. The RI information is the RI information obtained by the first communication device through a traditional channel measurement process. The traditional channel measurement process can be understood as that there is no RIS between the first communication device and the second communication device, the reference signal is transmitted between the first communication device and the second communication device, and the reference signal is measured to obtain the RI information. The RI information indicates the corresponding rank. The at least one propagation path is the propagation path between the first communication device and the second communication device. The at least one propagation path includes at least one of the following: the LOS path between the first communication device and the second communication device, and the NLOS path between the first communication device and the second communication device. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device passing through the RIS. Thereby, the different reflection characteristics of the RIS for incident paths at different angles are used to increase the spatial isolation. When the RIS is deployed on the first communication device or the second communication device, the at least one propagation path passes through the RIS.

[0226] The second information is used to indicate the first rank, and / or the second information is used to indicate the power boost, eigenvalue boost, or singular value boost of the at least one propagation path. The first rank is greater than or equal to the rank indicated by the RI information. For the at least one propagation path, please refer to the aforementioned related introduction. Optionally, the second information includes the power, eigenvalue, or singular value of the at least one propagation path; or, the second information includes the power boost, eigenvalue boost, or singular value boost of the at least one propagation path.

[0227] The following introduces some possible determination methods of the first information and / or the second information in combination with the implementation method of the channel parameter. This application is still applicable to other determination methods, and this application does not make any specific limitations.

[0228] 1. Channel parameters include: angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0229] Optionally, after step 202 and before step 203, the first communication device determines one or more path angle differences according to the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences according to the time delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences according to the Doppler information of the multiple propagation paths. Each of the one or more path angle differences may be calculated based on the angles of two or more propagation paths. For the angles of the multiple propagation paths, please refer to the above-mentioned related introduction. For example, the multiple propagation paths include path 1, path 2, and path 3, and the angles of the multiple propagation paths include the AOA of path 1, the AOA of path 2, and the AOA of path 3. The one or more path angle differences include the AOA difference between path 1 and path 2, the AOA difference between path 1 and path 3, and the AOA difference between path 2 and path 3. Each of the one or more path delay differences may be calculated based on the time delays of two or more propagation paths. Each of the one or more path Doppler information differences may be calculated based on the Doppler information of two or more propagation paths. For example, the multiple propagation paths include path 1, path 2, and path 3, and the information of the multiple propagation paths includes the Doppler of path 1, the Doppler of path 2, and the Doppler of path 3. The one or more path Doppler information differences include the Doppler difference between path 1 and path 2, the Doppler difference between path 1 and path 3, and the Doppler difference between path 2 and path 3.

[0230] Optionally, the above-mentioned step 203 specifically includes: when at least one of the one or more radial angle differences is less than or equal to the radial angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to the path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than or equal to the path Doppler information difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device; wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path. Alternatively, when each of the one or more radial angle differences is greater than a radial angle difference threshold, or, when each of the one or more path delay differences is greater than a path delay difference threshold, or, when each of the one or more path Doppler information differences is greater than a path Doppler information difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0231] Alternatively, the above-mentioned step 203 specifically includes: when at least one of the one or more radial angle differences is less than the radial angle difference threshold, or, when at least one of the one or more radial delay differences is less than the radial delay difference threshold, or, when at least one of the one or more radial Doppler information differences is less than the radial Doppler information difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device; wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path. Alternatively, when each of the one or more radial angle differences is greater than or equal to a radial angle difference threshold, or, when each of the one or more path delay differences is greater than or equal to a path delay difference threshold, or, when each of the one or more path Doppler information differences is greater than or equal to a path Doppler information difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0232] Optionally, the value of the radial angle difference threshold can be determined based on at least one of the number of transceiver antennas, the receiving threshold of the receiver, and the sensitivity of the receiver. For example, the more transceiver antennas there are, the smaller the radial angle difference threshold can be. The greater the sensitivity of the receiver, the smaller the radial angle difference threshold can be. Optionally, the radial angle difference threshold can be a scalar or a vector, and the specific form of the radial angle difference threshold is not limited in this application. Optionally, the radial angle difference threshold can be a horizontal angle difference threshold between propagation paths, or a vertical angle difference threshold between propagation paths. For example, the radial angle difference threshold can be a 3dB (decibel) beamwidth of a Discrete Fourier Transform (DFT) beam, or 0.5 times the beamwidth of a DFT beam, etc.

[0233] It should be noted that the method for determining the radial delay difference threshold and the method for determining the radial Doppler information difference threshold are similar to the method for determining the radial angle difference threshold, and the details can be referred to the above related introduction.

[0234] The above shows a possible implementation method of the first communication device sending the first information and / or the second information according to the one or more radial angle differences. In practical applications, there may be other implementation methods, which are not specifically limited in this application. Two other possible implementation methods are introduced below.

[0235] In a possible implementation, the above-mentioned step 203 specifically includes: when the number of radial angle differences less than or equal to the radial angle difference threshold among the one or more radial angle differences is greater than or equal to the radial angle difference number threshold, or, when the number of radial delay differences less than or equal to the radial delay difference threshold among the one or more radial delay differences is greater than or equal to the radial delay difference number threshold, or, when the number of radial Doppler information differences less than or equal to the radial Doppler information difference threshold among the one or more radial Doppler information differences is greater than or equal to the radial Doppler information number threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device; wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path. Alternatively, when the number of the one or more radial angle differences that is greater than the radial angle difference threshold is less than the radial angle difference number threshold, or, when the number of the one or more radial delay differences that is greater than the radial delay difference threshold is less than the radial delay difference number threshold, or, when the number of the one or more radial Doppler information differences that is greater than the radial Doppler information difference threshold is less than the radial Doppler information number threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased. For another example, the above-mentioned step 203 specifically includes: when the number of radial angle differences less than or equal to the radial angle difference threshold among the one or more radial angle differences is greater than the radial angle difference number threshold, or, when the number of radial delay differences less than or equal to the radial delay difference threshold among the one or more radial delay differences is greater than the radial delay difference number threshold, or, when the number of radial Doppler information differences less than or equal to the radial Doppler information difference threshold among the one or more radial Doppler information differences is greater than the radial Doppler information number threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device; wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or to indicate an increase in the power, eigenvalue or singular value of at least one propagation path. Alternatively, when the number of the one or more radial angle differences that is greater than the radial angle difference threshold is less than or equal to the radial angle difference number threshold, or, when the number of the one or more radial delay differences that is greater than the radial delay difference threshold is less than or equal to the radial delay difference number threshold, or, when the number of the one or more radial Doppler information differences that is greater than the radial Doppler information difference threshold is less than or equal to the radial Doppler information number threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.The method for determining the radial angle difference number threshold, the method for determining the radial delay difference number threshold and the method for determining the radial Doppler information difference number threshold are similar to the method for determining the radial angle difference threshold mentioned above. For details, please refer to the method for determining the radial angle difference threshold mentioned above, which will not be repeated here.

[0236] In another possible implementation, a multi-level path angle difference threshold, or a multi-level path delay difference threshold, or a multi-level path Doppler information difference is designed in the communication system, and the first communication device compares the one or more path angle differences with the multi-level path angle threshold to determine the first information and / or the second information. Alternatively, the first communication device compares the one or more path delay differences with the multi-level path delay difference threshold to determine the first information and / or the second information. Alternatively, the first communication device compares the one or more path Doppler information differences with the multi-level path Doppler information difference threshold to determine the first information and / or the second information. For example, the multi-level path angle difference threshold includes a first-level path angle difference threshold and a second-level path angle difference threshold. When at least one of the one or more radial angle differences is less than or equal to the first-level radial angle difference threshold, and at least two of the one or more radial angle differences are less than or equal to the second-level radial angle difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device; wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, characteristic value or singular value of at least one propagation path. Alternatively, when each of the one or more radial angle differences is greater than the first-level radial angle difference threshold, and each of the one or more radial angle differences is greater than the second-level radial angle difference threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, characteristic value or singular value of at least one propagation path. The determination methods corresponding to the first-level radial angle difference threshold and the second-level radial angle difference threshold are similar to the determination methods of the aforementioned radial angle difference thresholds. For details, please refer to the determination methods of the aforementioned radial angle difference thresholds, which will not be repeated here. The first-level path angle difference threshold and the second-level path angle difference threshold may be weighted by different coefficients of the DFT beam width, respectively, so as to measure the probability of enhancing the rank.

[0237] It can be seen that the first communication device determines the first information and / or the second information based on the angles, delays or Doppler information of multiple propagation paths and corresponding thresholds, thereby achieving a reasonable improvement in the rank used for communication and improving the system capacity.

[0238] 2. The channel parameter includes at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0239] Optionally, after step 202 and before step 203, the first communication device determines one or more path correlations based on at least one of the angles, powers, delays, and Doppler information of multiple propagation paths between the first communication device and the second communication device. The one or more path correlations may be calculated based on at least one of the angles, powers, delays, and Doppler information of two or more propagation paths. The path correlation characterizes the correlation between channels corresponding to the propagation paths. The greater the correlation, the worse the channel isolation, and the smaller the correlation, the better the channel isolation. For example, taking propagation path A and propagation path B as an example, W a is the channel information corresponding to the propagation path A, W b is the channel information corresponding to propagation path B, and the path correlation between propagation path A and propagation path B Indicates taking W b The conjugate transpose of |W a | indicates that W a Modulus, |W b | indicates that W b Find the model. W a Dot product W b * .

[0240] Optionally, the above-mentioned step 203 specifically includes: when at least one path correlation among one or more path correlations is greater than or equal to a path correlation threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in the power, eigenvalue or singular value of at least one propagation path; or, when each path correlation among one or more path correlations is less than the path correlation threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or is used to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0241] Alternatively, the above step 203 specifically includes: when at least one path correlation among one or more path correlations is greater than a path correlation threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when each path correlation among one or more path correlations is less than or equal to the path correlation threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path. The method for determining the path correlation threshold is similar to the method for determining the aforementioned path angle difference threshold, and the method for determining the aforementioned path angle difference threshold can be specifically referred to, which will not be repeated here. For example, the path correlation threshold belongs to the interval [0.8, 1]. Generally, the more the number of transceiver antennas or the higher the sensitivity of the receiver, the higher the path correlation threshold can be set.

[0242] The above shows a possible implementation manner in which the first communication device sends the first information and / or the second information according to the one or more path correlations. In practical applications, there may be other implementation manners, which are not specifically limited in this application. Two other possible implementation manners are introduced below.

[0243] In a possible implementation, the above-mentioned step 203 specifically includes: when the number of path correlations greater than or equal to the path correlation threshold among the one or more path correlations is greater than or equal to the path correlation number threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate to increase the power, eigenvalue or singular value of at least one propagation path; or, when the number of path correlations less than the path correlation threshold among the one or more path correlations is less than the path correlation number threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path. For another example, the above step 203 specifically includes: when the number of path correlations greater than the path correlation threshold among the one or more path correlations is greater than the path correlation number threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path; or, when the number of path correlations less than the path correlation threshold among the one or more path correlations is less than or equal to the path correlation number threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power, eigenvalue or singular value of at least one propagation path. The method for determining the path correlation number threshold is similar to the method for determining the aforementioned path angle difference threshold, and the method for determining the aforementioned path angle difference threshold can be specifically referred to, which will not be repeated here.

[0244] In another possible implementation, a multi-level path correlation threshold is designed in the communication system, and the first communication device compares the one or more path correlations with the multi-level path correlation threshold to determine the first information and / or the second information. For example, the multi-level path correlation threshold includes a first-level path correlation threshold and a second-level path correlation threshold. When at least one path correlation among the one or more path correlations is greater than or equal to the first-level path correlation threshold, and at least two path correlations among the one or more path correlations are greater than or equal to the second-level path correlation threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, characteristic value or singular value of at least one propagation path; or, when each path correlation among the one or more path correlations is less than the first-level path correlation threshold, and each path correlation is less than the second-level path correlation threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, to indicate that the power, characteristic value or singular value of at least one propagation path is not increased. The method for determining the multi-level radial correlation threshold is similar to the method for determining the radial angle difference threshold mentioned above. For details, please refer to the method for determining the radial angle difference threshold mentioned above, which will not be repeated here.

[0245] 3. The channel parameter includes at least one of the following: power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device.

[0246] Optionally, after the above step 202 and before step 203, the first communication device determines one or more path power differences based on the powers of the multiple propagation paths, or the first communication device determines one or more path eigenvalue differences based on the eigenvalues ​​of the multiple propagation paths, or the first communication device determines one or more path singular value differences based on the singular values ​​of the multiple propagation paths.

[0247] Optionally, the above-mentioned step 203 specifically includes: when at least one path power difference among one or more path power differences is greater than or equal to the path power difference threshold, or at least one path characteristic value difference among one or more path eigenvalue differences is greater than or equal to the path characteristic value difference threshold, or at least one path singular value difference among one or more path singular value differences is greater than or equal to the path singular value difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information , and / or, used to indicate to increase the power, eigenvalue or singular value of at least one propagation path; or, when each path power difference in one or more path power differences is less than a path power difference threshold, or each path eigenvalue difference in one or more path eigenvalue differences is less than a path eigenvalue difference threshold, or each path singular value difference in one or more path singular value differences is less than a path singular value difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, used to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0248] Alternatively, the above-mentioned step 203 specifically includes: when at least one of the one or more path power differences is greater than the path power difference threshold, or at least one of the one or more path eigenvalue differences is greater than the path eigenvalue difference threshold, or at least one of the one or more path singular value differences is greater than the path singular value difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate Increase the power, eigenvalue or singular value of at least one propagation path; or, when each path power difference in one or more path power differences is less than or equal to a path power difference threshold, or each path eigenvalue difference in one or more path eigenvalue differences is less than or equal to a path eigenvalue difference threshold, or each path singular value difference in one or more path singular value differences is less than or equal to a path singular value difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0249] Optionally, the method for determining the diameter power difference threshold, the method for determining the diameter eigenvalue difference threshold, and the method for determining the diameter singular value difference threshold are all similar to the method for determining the aforementioned diameter angle difference threshold. For details, please refer to the method for determining the aforementioned diameter angle difference threshold, which will not be repeated here.

[0250] The above shows a possible implementation method in which the first communication device sends the first information and / or the second information according to the one or more path power differences, the one or more path characteristic value differences, or the one or more path singular value differences. In practical applications, other implementation methods are also possible, and this application does not limit them. Two other possible implementation methods are introduced below.

[0251] In a possible implementation, the above-mentioned step 203 specifically includes: when the number of path power differences greater than or equal to the path power difference threshold in one or more path power differences is greater than or equal to the path power difference number threshold, or when the number of path characteristic value differences greater than or equal to the path characteristic value difference threshold in one or more path eigenvalue differences is greater than or equal to the path eigenvalue difference number threshold, or when the number of path singular value differences greater than or equal to the path singular value difference threshold in one or more path singular value differences is greater than or equal to the path singular value difference number threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device; wherein the first information is used to indicate the enhanced RI information indicated rank, and / or, used to indicate that the power, eigenvalue or singular value of at least one propagation path is increased; or, when the number of path power differences less than the path power difference threshold in one or more path power differences is less than the path power difference number threshold, or when the number of path characteristic value differences less than the path characteristic value difference threshold in one or more path characteristic value differences is less than the path characteristic value difference number threshold, or when the number of path singular value differences less than the path singular value difference threshold in one or more path singular value differences is less than the path singular value difference number threshold, the first communication device sends a first message to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or, used to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased. The method for determining the path power difference number threshold, the method for determining the path eigenvalue number threshold and the method for determining the path singular value number threshold are similar to the method for determining the aforementioned path angle difference threshold. For details, please refer to the method for determining the aforementioned path angle difference threshold, which will not be repeated here.

[0252] In another possible implementation, a multi-level path power difference threshold, a multi-level path characteristic value difference threshold or a multi-level path singular value difference threshold is designed in the communication system. The first communication device compares the one or more path power differences with the multi-level path power difference threshold to determine the first information and / or the second information. Alternatively, the first communication device compares the one or more path characteristic value differences with the multi-level path characteristic value difference threshold to determine the first information and / or the second information. Alternatively, the first communication device compares the one or more path singular value differences with the multi-level path singular value difference threshold to determine the first information and / or the second information. For example, the multi-level path power difference threshold includes a first-level path power difference threshold and a second-level path power difference threshold. When at least one of the one or more path power differences is greater than or equal to the first-level path power difference threshold, and at least two of the one or more path power differences are greater than or equal to the second-level path power difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power of at least one propagation path; or, when each of the one or more path power differences is less than the first-level path power difference threshold, and each of the path power differences is less than the second-level path power difference threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to increase the power of at least one propagation path. The method for determining the multi-level path power difference threshold, the method for determining the multi-level path characteristic value difference threshold, or the method for determining the multi-level path singular value difference threshold are all similar to the method for determining the aforementioned path angle difference threshold. For details, please refer to the aforementioned method for determining the path angle difference threshold, which will not be repeated here.

[0253] For another example, the multi-level path characteristic value difference threshold includes a first-level path characteristic value difference threshold and a second-level path characteristic value difference threshold. When at least one path characteristic value difference among the one or more path characteristic value differences is greater than or equal to the first-level path characteristic value difference threshold, and at least two path characteristic value differences among the one or more path characteristic value differences are greater than or equal to the second-level path characteristic value difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the improvement of the characteristic value of at least one propagation path; or, when each path characteristic value difference among the one or more path characteristic value differences is less than the first-level path characteristic value difference threshold, and each path characteristic value difference is less than the second-level path characteristic value difference threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or, to indicate not to improve the characteristic value of at least one propagation path.

[0254] For another example, when at least one of the one or more path singular value differences is greater than or equal to a first-level path singular value difference threshold, and at least two of the one or more path singular value differences are greater than or equal to a second-level path singular value difference threshold, the first communication device sends first information and second information to the second communication device, or the first communication device sends second information to the second communication device, wherein the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate an increase in the singular value of at least one propagation path; or, when each of the one or more path singular value differences is less than the first-level path singular value difference threshold, and each of the path singular value differences is less than the second-level path singular value difference threshold, the first communication device sends first information to the second communication device, wherein the first information is used to indicate not to enhance the rank indicated by the RI information, and / or is used to indicate not to increase the singular value of at least one propagation path.

[0255] Optionally, the second information includes the first rank, or includes an improvement of the first rank compared to the rank indicated by the RI information. The value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device. The value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

[0256] Optionally, the first information may occupy 1 bit, 2 bits, or 3 bits, which is not limited in this application. Figure 3A As shown, the first information occupies 1 bit. The second information is used to indicate the improvement of the first rank compared to the rank indicated by the RI information. The bits occupied by the second information can be log 2 (L path -K).

[0257] It should be noted that, optionally, the first communication device determines the power boost, eigenvalue boost, or singular value boost of the first rank or at least one propagation path based on the channel parameters. For example, the channel parameters include the angles of multiple propagation paths, and the first communication device determines one or more diameter angle differences based on the angles of the multiple propagation paths. When there are X diameter angle differences among the one or more diameter angle differences that are less than or equal to the diameter angle difference threshold, the value of the first rank may belong to the interval [K, K+X], where K is the rank indicated by the RI information. In extreme cases, if the X diameter angle differences all come from different propagation paths, the first rank is X larger than the rank indicated by the RI information; if the X diameter angle differences all come from a certain propagation path, the first rank is 1 larger than the rank indicated by the RI information. For another example, the first communication device may use the channel traversal between the first communication device and the second communication device to take a value from 1 to L. pathThe corresponding precoding matrix is ​​used to calculate the equivalent channel power and determine the first rank in the form of taking the maximum value.

[0258] Optionally, the first communication device sends the first information and / or the second information to the second communication device according to a preset period. That is, each time the first communication device measures the first reference signal, the first communication device can obtain the corresponding first information and / or second information. The first communication device can feed back the first information and / or the second information to the second communication device. When the first information is used to indicate the rank indicated by the enhanced RI information, and / or, to indicate the increase of the power, eigenvalue or singular value of at least one propagation path, the first communication device can stop measuring the first reference signal.

[0259] It can be seen that the first communication device determines the first information and / or the second information based on the channel parameters, and sends the first information and / or the second information to the second communication device. Thus, the first communication device indicates to the second communication device whether to enhance the rank indicated by the RI information based on the channel parameters. Thus, a reasonable improvement of the rank used for communication is achieved, which is conducive to improving the system capacity.

[0260] Optional, Figure 2 The illustrated embodiment further includes step 204. Step 204 may be performed after step 203, or simultaneously with step 203, which is not specifically limited in the present application.

[0261] 204. The first communication device sends third information to the second communication device. Correspondingly, the second communication device receives the third information from the first communication device.

[0262] The first information is used to indicate the weighting coefficient matrix adopted by switching the RIS.

[0263] When the first communication device sends the first information and the second information, wherein the first information is used to indicate the rank indicated by the enhanced RI information, or is used to indicate the increase of the power, eigenvalue or singular value of at least one propagation path, or when the first communication device sends the second information, the first communication device also sends the third information to the second communication device. That is, when the first communication device determines to enhance the rank indicated by the RI information or increase the power, eigenvalue or singular value of at least one propagation path, the first communication device can instruct the second communication device to switch the weighting coefficient matrix used by the RIS.

[0264] Optional, Figure 2 The illustrated embodiment further includes steps 205 to 208. Steps 205 to 208 may be performed after step 203.

[0265] 205. The second communication device sends a second reference signal to the first communication device via the RIS. Correspondingly, the first communication device receives the second reference signal from the second communication device via the RIS.

[0266] Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting. Specifically, when the second communication device receives the third information, the second communication device can control or instruct the RIS to switch the weighting coefficient matrix it uses. Optionally, the RIS can use a preset non-unit weighting coefficient matrix for weighting. Alternatively, the second communication device determines a corresponding non-unit weighting coefficient matrix and instructs the RIS to use the non-unit weighting coefficient matrix, and the RIS uses the non-unit weighting coefficient matrix for weighting. For example, the second communication device can traverse each column in the DFT matrix as the diagonal elements of the above-mentioned weighting coefficient matrix.

[0267] In one possible implementation, the first communication device is a terminal device, the second communication device is a network device, and the second reference signal may be a second CSI-RS. In another possible implementation, the first communication device is a network device, the second communication device is a terminal device, and the second reference signal may be a second SRS.

[0268] Optionally, the second communication device sends the second reference signal to the first communication device via the RIS according to a preset period. Correspondingly, the first communication device receives the second reference signal from the second communication device via the RIS according to a preset period. Figure 3B As shown, the first communication device receives the second reference signal according to the measurement period of the second reference signal and measures the second reference signal.

[0269] 206. The first communication device measures the second reference signal based on the first information and the second information or measures the second reference signal based on the second information to obtain first channel information between the first communication device and the second communication device.

[0270] In a possible implementation, the first information is used to indicate the rank indicated by the enhanced RI information, and / or to increase the power boost, eigenvalue boost, or singular value boost of at least one propagation path. The second information is used to indicate the first rank, and / or to indicate the power boost, eigenvalue boost, or singular value boost of at least one propagation path. The first communication device measures the second reference signal based on the second information to obtain the first channel information. That is, the first communication device determines to obtain the first channel information based on the first rank indicated by the second information and / or the power boost, eigenvalue boost, or singular value boost of at least one propagation path indicated by the second information.

[0271] In another possible implementation, the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or the power increase, eigenvalue increase, or singular value increase of at least one propagation path is not increased. The first communication device measures the second reference signal based on the rank indicated by the RI information.

[0272] 207. The first communication device determines first channel characteristic information according to the first channel information.

[0273] Optionally, the first channel characteristic information includes: a first rank. If the first communication device determines to enhance the rank indicated by the RI information, the first rank is greater than the rank indicated by the RI information. If the first communication device determines not to enhance the rank indicated by the RI information, the first rank is equal to the rank indicated by the RI information.

[0274] Optionally, the first channel characteristic information further includes at least one of the following: a channel quality indication (CQI), a precoding matrix indication (PMI), or a signal-to-noise ratio (SNR). The CQI, PMI, and SNR are determined based on the first rank.

[0275] 208. The first communication device sends the first channel characteristic information to the second communication device. Correspondingly, the second communication device receives the first channel characteristic information from the first communication device.

[0276] Optional, if Figure 2 The illustrated embodiment further includes step 204 , and steps 205 to 208 may be performed after step 204 .

[0277] Optionally, the second communication device sends a second reference signal to the first communication device through the RIS according to a preset period. In each process in which the second communication device sends the second reference signal, the RIS can use different non-unit weighting coefficient matrices. The first communication device receives the second reference signal from the second communication device through the RIS according to a preset period, and the first communication device measures the second reference signal and feeds back the obtained multiple channel characteristic information to the second communication device. Each channel characteristic information corresponds to a non-unit weighting coefficient matrix. The second communication device can select appropriate channel characteristic information in combination with multiple channel characteristic information. For example, the second communication device selects the channel characteristic information that best represents the channel quality for data transmission. Accordingly, the RIS uses the corresponding non-unit weighting coefficient matrix for weighting, which is conducive to improving the system performance gain and improving the system capacity.

[0278] Optional, Figure 2 The illustrated embodiment further includes steps 209 and 210. Steps 209 and 210 may be performed after step 208.

[0279] 209. The second communication device determines a data transmission parameter according to the first channel characteristic information.

[0280] Optionally, the data transmission parameters include at least one of the following: a beam used to send data, the number of data streams, or a modulation and coding scheme (MCS).

[0281] For example, the first channel characteristic information includes a first rank, CQI, and PMI. The second communication device determines a beam used to send data according to the first rank. The second communication device determines the number of data streams and MCS used to send data according to the first rank, CQI, and PMI.

[0282] 210. The second communication device sends data to the first communication device via the RIS using data transmission parameters. Correspondingly, the first communication device receives data from the second communication device via the RIS.

[0283] Among them, RIS adopts a non-unit weighting coefficient matrix.

[0284] In an embodiment of the present application, a first communication device receives a first reference signal from a second communication device through RIS. Then, the first communication device measures the first reference signal to obtain a channel parameter of a channel between the first communication device and the second communication device. The first communication device sends the first information and / or the second information to the second communication device. It can be seen that in the technical solution of the present application, the first communication device determines the first information and / or the second information according to the channel parameter, and sends the first information and / or the second information to the second communication device. Among them, the first information and / or the second information are determined according to the channel parameter, and the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path. The second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path. The first rank is greater than or equal to the rank indicated by the RI information, and at least one propagation path is the propagation path between the first communication device and the second communication device. Thereby avoiding the problem that the rank used for communication in some scenarios leads to a sharp decline in system performance gain. It is conducive to improving system capacity, thereby ensuring communication performance.

[0285] Figure 4 This is a schematic diagram of an embodiment of the information sending method and information receiving method of the present application. Figure 4 , methods include:

[0286] 401. A second communication device sends a first reference signal to a first communication device. Correspondingly, the first communication device receives the first reference signal from the second communication device.

[0287] Step 401 and the aforementioned Figure 2Step 201 in the embodiment shown is similar, and specific details can be found in the aforementioned Figure 2 The relevant introduction of step 201 in the illustrated embodiment will not be repeated here.

[0288] 402. A first communication device measures a first reference signal to obtain first channel characteristic information and second channel characteristic information.

[0289] Optionally, the first channel characteristic information includes a first rank, and the first rank is greater than the rank indicated by the RI information. The second channel characteristic information is determined based on the first channel characteristic information. Optionally, the second channel characteristic information includes at least one of the following: CQI, PMI or SNR. That is, the second channel characteristic information is obtained by measuring the first reference signal based on the first rank.

[0290] The following describes a possible implementation method for the first communication device to determine the first channel characteristic information. This application is still applicable to other implementation methods, and this application does not specifically limit them.

[0291] Optionally, the first communication device determines the first channel characteristic information including: the first communication device measures a first reference signal to obtain a channel parameter of a channel between the first communication device and the second communication device; and the first communication device determines the first channel characteristic information based on the channel parameter.

[0292] The first channel characteristic information is introduced below in conjunction with some possible implementations of the channel parameters.

[0293] 1. Channel parameters include angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0294] For the angles of multiple propagation paths, please refer to the previous Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0295] Optionally, the first communication device determines one or more path angle differences based on the angles of multiple propagation paths between the first communication device and the second communication device, or the first communication device determines one or more path delay differences based on the time delays of multiple propagation paths between the first communication device and the second communication device, or the first communication device determines one or more path Doppler information differences based on Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0296] Each of the one or more radial angle differences can be calculated based on the angles of two or more propagation paths. For the angles of multiple propagation paths, please refer to the aforementioned related introduction. At least one of the one or more radial angle differences is less than or equal to the radial angle difference threshold. Or, at least one of the one or more radial angle differences is less than the radial angle difference threshold. That is, when at least one of the one or more radial angle differences is less than or equal to the radial angle difference threshold, the first rank is greater than the rank indicated by the RI information, indicating that the first communication device determines the rank indicated by the enhanced RI information. For the relevant introduction to the radial angle difference threshold, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0297] Each of the one or more path delay differences can be calculated based on the delay of two or more propagation paths. Among the one or more path delay differences, at least one path delay difference is less than or equal to the path delay difference threshold. Or, among the one or more path delay differences, at least one path delay difference is less than the path delay difference threshold. That is, when at least one path delay difference among the one or more path delay differences is less than or equal to the path delay difference threshold, the first rank is greater than the rank indicated by the RI information, indicating that the first communication device determines the rank indicated by the enhanced RI information. For an introduction to the path delay difference threshold, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0298] Each of the one or more path Doppler information differences can be calculated based on the Doppler information of two or more propagation paths. For example, the multiple propagation paths include path 1, path 2 and path 3, and the information of the multiple propagation paths includes the Doppler of path 1, the Doppler of path 2 and the Doppler of path 3. The one or more path Doppler information differences include the Doppler difference between path 1 and path 2, the Doppler difference between path 1 and path 3, and the Doppler difference between path 2 and path 3. Among the one or more path Doppler information differences, at least one path Doppler information difference is less than or equal to the path Doppler information difference threshold. Alternatively, among the one or more path Doppler information differences, at least one path Doppler information difference is less than the path Doppler information difference threshold. The first rank is greater than the rank indicated by the RI information, indicating that the first communication device determines the rank indicated by the enhanced RI information. For the relevant introduction to the path Doppler information difference threshold, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0299] The above shows an implementation method in which the first communication device determines the rank indicated by the enhanced RI information. In practical applications, there may be other implementation methods, which are not limited in this application. For example, when the number of the one or more radial angle differences that is less than or equal to the radial angle difference threshold is greater than or equal to the radial angle difference number threshold, or when at least one of the one or more radial angle differences is less than or equal to the first-level radial angle difference threshold, and at least two of the one or more radial angle differences are less than or equal to the second-level radial angle difference threshold, the first communication device determines the rank indicated by the enhanced RI information. That is, the first rank indicated by the first information is greater than the rank indicated by the RI information. For details about the radial angle difference number threshold, the first-level radial angle difference threshold, and the second-level radial angle difference threshold, please refer to the aforementioned Figure 2 The relevant introduction of the embodiment shown in the figure will not be repeated here. For more specific implementations, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0300] It can be seen that the first communication device determines the first rank based on the angles of multiple propagation paths and the path angle difference threshold, or the first communication device determines the first rank based on the delays of multiple propagation paths and the path delay difference threshold, or the first communication device determines the first rank based on the Doppler information of multiple propagation paths and the path Doppler information difference threshold. This achieves a reasonable improvement in the rank used for communication and improves system capacity.

[0301] 2. The channel parameters include angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0302] Optionally, the first communication device determines one or more path correlations based on at least one of the angles, powers, delays, and Dopplers of the multiple propagation paths between the first communication device and the second communication device. The one or more path correlations may be calculated based on at least one of the angles, powers, delays, and Doppler information of two or more propagation paths. For information about the angles, powers, delays, or Dopplers of the multiple propagation paths, please refer to the aforementioned Figure 2 Related introduction in the illustrated embodiment.

[0303] At least one of the one or more path correlations is greater than or equal to the path correlation threshold. That is, when at least one of the one or more path correlations is greater than or equal to the path correlation threshold, the first rank is greater than the rank indicated by the RI information, indicating that the first communication device determines the rank indicated by the enhanced RI information. For an introduction to the path correlation threshold, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0304] The above shows an implementation method for the first communication device to determine the rank indicated by the enhanced RI information. In practical applications, there may be other implementation methods, which are not limited in this application. For example, when the number of path correlations greater than or equal to the path correlation threshold in the one or more path correlations is greater than or equal to the path correlation number threshold, or there is at least one path correlation greater than or equal to the first-level path correlation threshold in the one or more path correlations, and there are at least two path correlations greater than or equal to the second-level path correlation threshold in the one or more path correlations, the first communication device determines the rank indicated by the enhanced RI information. That is, the first rank indicated by the first information is greater than the rank indicated by the RI information. For details about the path correlation number threshold, the first-level path correlation threshold, and the second-level path correlation threshold, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0305] From this, it can be seen that the first communication device determines the first channel characteristic information based on at least one of the angles, powers, delays, and Doppler information between multiple propagation paths and a path correlation threshold, thereby achieving a reasonable improvement in the rank used for communication and improving system capacity.

[0306] 3. The channel parameters include power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device.

[0307] Optionally, the first communication device determines one or more path power differences based on the powers of multiple propagation paths between the first communication device and the second communication device, or the first communication device determines one or more path characteristic value differences based on the characteristic values ​​of multiple propagation paths, or the first communication device determines one or more path singular value differences based on the singular values ​​of multiple propagation paths. For the characteristic values ​​or singular values ​​of multiple propagation paths, please refer to the aforementioned Figure 2 Related introduction in the illustrated embodiment.

[0308] When at least one of the one or more path power differences is greater than or equal to the path power difference threshold, or at least one of the one or more path characteristic value differences is greater than or equal to the path characteristic value difference threshold, or at least one of the one or more path singular value differences is greater than or equal to the path singular value difference threshold, the first rank is greater than the rank indicated by the RI information, indicating that the first communication device determines the rank indicated by the enhanced RI information. For the relevant introduction of the path power difference threshold, the path characteristic value threshold and the path singular value difference threshold, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0309] The above shows an implementation method in which the first communication device determines the rank indicated by the enhanced RI information based on the one or more path power differences, or the one or more path eigenvalue differences, or the one or more path singular value differences. In practical applications, there may be other implementation methods. For example, when the number of path power differences greater than or equal to the path power difference threshold in one or more path power differences is greater than or equal to the path power difference number threshold, or when the number of path characteristic value differences greater than or equal to the path characteristic value difference threshold in one or more path eigenvalue differences is greater than or equal to the path characteristic value difference number threshold, or when the number of path singular value differences greater than or equal to the path singular value difference threshold in one or more path singular value differences is greater than or equal to the path singular value difference number threshold, the first rank is greater than the rank indicated by the RI information, indicating that the first communication device determines the rank indicated by the enhanced RI information. For the path power difference number threshold, the path eigenvalue difference number threshold, and the path singular value difference number threshold, please refer to the aforementioned Figure 2 Related introduction in the illustrated embodiment. For another example, when at least one of the one or more path power differences is greater than or equal to the first-level path power difference threshold, and at least two of the one or more path power differences are greater than or equal to the second-level path power difference threshold, or, when at least one of the one or more path characteristic value differences is greater than or equal to the first-level path characteristic value difference threshold, and at least two of the one or more path characteristic value differences are greater than or equal to the second-level path characteristic value difference threshold, or, at least one of the one or more path singular value differences is greater than or equal to the first-level path singular value difference threshold, and at least two of the one or more path singular value differences are greater than or equal to the second-level path singular value difference threshold, the first rank is greater than the rank indicated by the RI information, indicating that the first communication device determines the rank indicated by the enhanced RI information. For the first-level path power difference threshold, the second-level path power difference threshold, the first-level path characteristic value difference threshold, the second-level path characteristic value difference threshold, the first-level path singular value difference threshold and the second-level path singular value difference threshold, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0310] Optionally, the value of the first rank belongs to the interval [K, L path ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device.

[0311] Optionally, the first information is used to indicate the improvement of the first rank compared to the rank indicated by the RI information. The bits occupied by the first information can be log 2 (L path -K).

[0312] Optionally, the first communication device determines the first rank according to the channel parameter. Figure 2 Related introduction in the illustrated embodiment.

[0313] In this embodiment, the first communication device determines the rank indicated by the enhanced RI information and determines the channel characteristic information in the same measurement process. That is, the first communication device determines the first rank and the second channel characteristic information in the process of measuring the channel characteristic. The second channel characteristic information is obtained by measuring the first reference signal based on the first rank. The first rank is greater than the rank indicated by the RI information.

[0314] 403. The first communication device sends the first channel characteristic information and the second channel characteristic information to the second communication device. Correspondingly, the second communication device receives the first channel characteristic information and the second channel characteristic information from the first communication device.

[0315] Optional, Figure 4 The illustrated embodiment also includes step 404 .

[0316] 404. The first communication device sends instruction information to the second communication device. Correspondingly, the second communication device receives the instruction information from the first communication device.

[0317] The indication information is used to indicate that the second channel characteristic information is determined based on the first rank. That is, the first communication device informs the second communication device through the indication information that the second channel characteristic information is obtained based on enhanced rank measurement.

[0318] It should be noted that there is no fixed execution order between step 404 and step 403. Step 403 may be executed first, and then step 404; or, step 404 may be executed first, and then step 403; or, step 403 and step 404 may be executed simultaneously depending on the circumstances, which is not specifically limited in this application.

[0319] Optional, Figure 4 The illustrated embodiment further includes step 405. Step 405 may be performed after step 403.

[0320] 405. The first communication device sends switching information to the second communication device. Correspondingly, the second communication device receives the switching information from the first communication device.

[0321] The switching information is used to indicate the weighting coefficient matrix used by the switching RIS.

[0322] Specifically, the first communication device determines the rank indicated by the enhanced RI information, and the first communication device also sends switching information to the second communication device, thereby instructing the second communication device to switch the weighting coefficient matrix used by the RIS.

[0323] Optional, if Figure 4The illustrated embodiment also includes step 404, and there is no fixed execution order between step 404 and step 405. Step 404 may be executed first, and then step 405; or, step 405 may be executed first, and then step 404; or, step 404 and step 405 may be executed simultaneously according to circumstances, and the present application does not limit this.

[0324] Optional, Figure 4 The illustrated embodiment further includes step 406 to step 407. Step 406 to step 407 may be performed after step 403.

[0325] 406. The second communication device determines a data transmission parameter according to the first channel characteristic information and the second channel characteristic information.

[0326] Step 406 and the above Figure 2 Step 209 in the embodiment shown is similar, and can be referred to in detail in the foregoing Figure 2 The relevant introduction in step 209 in the illustrated embodiment will not be repeated here.

[0327] 407. The second communication device sends data to the first communication device via the RIS using the data transmission parameters. Correspondingly, the first communication device receives data from the second communication device via the RIS.

[0328] Optionally, RIS uses a non-unit weighting coefficient matrix for weighting.

[0329] Optionally, after the second communication device receives the switching information, the second communication device may control or instruct the RIS to switch the weighting coefficient matrix it uses. Optionally, the RIS may use a preset non-unit weighting coefficient matrix for weighting. Alternatively, the second communication device determines a corresponding non-unit weighting coefficient matrix and instructs the RIS to use the non-unit weighting coefficient matrix, and the RIS uses the non-unit weighting coefficient matrix for weighting. For relevant examples of the second communication device determining a non-unit weighting coefficient matrix, please refer to the aforementioned Figure 2 Related introduction in the illustrated embodiment.

[0330] Optional, if Figure 4 The illustrated embodiment includes steps 404 and 405 , and step 407 may be performed after steps 404 and 405 .

[0331] In an embodiment of the present application, a first communication device receives a first reference signal from a second communication device through RIS. The first communication device measures the first reference signal to obtain first channel characteristic information and second channel characteristic information. The first channel characteristic information includes a first rank, and the first rank is greater than the rank indicated by the RI information. The first communication device can determine the rank indicated by the enhanced RI information by measuring the first reference signal, and the second channel characteristic information is determined based on the first channel characteristic information. The first communication device sends the first channel characteristic information and the second channel characteristic information to the second communication device. This facilitates the first communication device to communicate using the enhanced first rank, which is beneficial to improving system performance gain and improving system capacity.

[0332] Figure 5 This is another embodiment diagram of the information sending method and information receiving method of the present application. Figure 5 , methods include:

[0333] 501. A second communication device sends a first reference signal to a first communication device. Correspondingly, the first communication device receives the first reference signal from the second communication device.

[0334] Step 501 and the aforementioned Figure 4 Step 401 in the embodiment shown is similar, and details can be found in the aforementioned Figure 4 The relevant introduction of step 401 in the illustrated embodiment will not be repeated here.

[0335] 502. The second communication device measures a first reference signal to obtain channel characteristics between the first communication device and the second communication device.

[0336] The channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information. The first information is used to indicate whether to enhance the rank indicated by the RI information, and / or to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path. The second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path. The first rank is greater than or equal to the rank indicated by the RI information, and at least one propagation path is a propagation path between the first communication device and the second communication device.

[0337] Optionally, the channel characteristic includes a first rank. If the first communication device determines to enhance the rank indicated by the RI information, the first rank is greater than the rank indicated by the RI information. If the first communication device determines not to enhance the rank indicated by the RI information, the first rank is equal to the rank indicated by the RI information.

[0338] Optionally, the channel characteristic further includes at least one of the following: CQI, PMI, or SNR. CQI, PMI, and SNR are determined based on the first rank.

[0339] Optional, Figure 5 The illustrated embodiment also includes step 502a.

[0340] 502a. The first communication device determines the first information and / or the second information according to a channel parameter of a channel between the first communication device and the second communication device. The channel parameter is obtained by measuring a first reference signal.

[0341] The following introduces some possible determination methods of the first information and / or the second information in combination with the implementation method of the channel parameter. This application is still applicable to other determination methods, and this application does not make any specific limitations.

[0342] 1. Channel parameters include: angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device. For information about angles, delays or Doppler information of multiple propagation paths, please refer to the aforementioned Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0343] Optionally, the above-mentioned step 502a specifically includes: the first communication device determines one or more path angle differences based on the angles of multiple propagation paths, and the first communication device determines the first information and / or the second information based on the one or more path angle differences; or, the first communication device determines one or more path delay differences based on the time delays of multiple propagation paths, and the first communication device determines the first information and / or the second information based on the one or more path delay differences; or, the first communication device determines one or more path Doppler information differences based on the Doppler information of multiple propagation paths, and the first communication device determines the first information and / or the second information based on the one or more path Doppler information differences.

[0344] The process of the first communication device determining the first information and / or the second information according to the one or more radial angle differences, the one or more radial delay differences or the one or more radial Doppler information differences is the same as the above Figure 2 In the embodiment shown, the process of the first communication device sending the first information and / or the second information according to the one or more path angle differences, the one or more path delay differences or the one or more path Doppler information differences is similar, and specific details can be referred to the aforementioned Figure 2 Related introduction in the illustrated embodiment.

[0345] It can be seen that the first communication device determines the first information and / or the second information based on the angles of multiple propagation paths and the path angle threshold. Alternatively, the first communication device determines the first information and / or the second information based on the delays of multiple propagation paths and the path delay threshold. Alternatively, the first communication device determines the first information and / or the second information based on the Doppler information of multiple propagation paths and the path Doppler information difference. This achieves a reasonable improvement in the rank used for communication and improves system capacity.

[0346] 2. The channel parameter includes at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0347] The one or more path correlations may be calculated based on at least one of the angle, power, delay and Doppler information of two or more propagation paths. Figure 2 The relevant introduction in the illustrated embodiment will not be repeated here.

[0348] Optionally, the above step 502a specifically includes: the first communication device determines one or more path correlations based on at least one of the angles, powers, delays, and Dopplers of multiple propagation paths; the first communication device determines the first information and / or the second information based on the one or more path correlations.

[0349] The process of the first communication device determining the first information and / or the second information according to the one or more path correlations is the same as the above Figure 2 In the embodiment shown, the process of the first communication device sending the first information and / or the second information according to the one or more path correlations is similar, and the details can be referred to in the aforementioned Figure 2 Related introduction in the illustrated embodiment.

[0350] 3. The channel parameter includes at least one of the following: power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device.

[0351] Optionally, the above-mentioned step 502a specifically includes: the first communication device determines one or more path power differences based on the powers of multiple propagation paths, or the first communication device determines one or more path characteristic value differences based on the characteristic values ​​of multiple propagation paths, or the first communication device determines one or more path singular value differences based on the singular values ​​of multiple propagation paths; the first communication device determines the first information and / or the second information based on the one or more path power differences, the one or more path characteristic value differences, or the one or more path singular value differences.

[0352] The process of the first communication device determining the first information and / or the second information according to the one or more path power differences, the one or more path characteristic value differences, or the one or more path singular value differences is the same as the above Figure 2 In the embodiment shown, the process in which the first communication device sends the first information and / or the second information according to the one or more path power differences, the one or more path characteristic value differences, or the one or more path singular value differences is similar, and specific reference may be made to the aforementioned Figure 2 Related introduction in the illustrated embodiment.

[0353] Optionally, the second information includes the first rank, or includes an improvement of the first rank compared to the rank indicated by the RI information. The value of the first rank belongs to the interval [K, Lpath ], K is the rank indicated by the RI information, L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

[0354] Optionally, the first information may occupy 1 bit, 2 bits, or 3 bits, which is not limited in this application. Figure 3A As shown, the first information occupies 1 bit. The second information is used to indicate the improvement of the first rank compared to the rank indicated by the RI information. The bits occupied by the second information can be log 2 (L path -K).

[0355] It should be noted that, optionally, the first communication device determines the power increase amount, eigenvalue increase amount, or singular value increase amount of the first rank or at least one propagation path according to the channel parameters. Figure 2 Related introduction in the illustrated embodiment.

[0356] It should be noted that step 502a can be performed before step 502, or step 502a can be performed simultaneously with step 502, which is not specifically limited in this application.

[0357] 503. The first communication device sends first channel characteristic information to the second communication device. Correspondingly, the second communication device receives the first channel characteristic information from the first communication device.

[0358] The first channel characteristic information includes channel characteristics and state information, and the state information is used to indicate that the channel characteristics are obtained based on the first information and / or the second information. Alternatively, the first channel characteristic information includes the first information and / or the second information, and the channel characteristics, thereby implicitly indicating through the first information and / or the second information that the channel characteristics are obtained based on the first information and / or the second information.

[0359] It can be seen that the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information. The first information and / or the second information are determined based on the channel parameters of the channel between the first communication device and the second communication device. This achieves a reasonable improvement in the rank used for communication, which is beneficial to improving the system capacity.

[0360] Optional, Figure 5 The illustrated embodiment further includes step 504 , which may be performed after step 502 .

[0361] 504. The first communication device sends third information to the second communication device. Correspondingly, the second communication device receives the third information from the first communication device.

[0362] The third information is used to indicate the weighting coefficient matrix used by switching the RIS.

[0363] When the first information is used to indicate the rank indicated by the enhanced RI information, and / or is used to indicate the increase of the power, eigenvalue or singular value of at least one propagation path, the first communication device sends the third information to the second communication device, so that the first communication device instructs the second communication device to switch the weighting coefficient matrix used by the RIS.

[0364] It should be noted that there is no fixed execution order between step 503 and step 504. Step 503 may be executed first, and then step 504; or step 504 may be executed first, and then step 503; or step 503 and step 504 may be executed simultaneously according to the circumstances, and this application does not limit this.

[0365] Optional, Figure 5 The illustrated embodiment further includes steps 505 to 506. Steps 505 to 506 may be performed after step 503.

[0366] 505. The second communication device determines a data transmission parameter according to the first channel characteristic information.

[0367] Step 505 is the same as the above Figure 2 Step 209 in the embodiment shown is similar, and can be referred to in detail in the foregoing Figure 2 The relevant introduction in step 209 in the illustrated embodiment will not be repeated here.

[0368] 506. The second communication device sends data to the first communication device via the RIS using the data transmission parameters. Correspondingly, the first communication device receives data from the second communication device via the RIS.

[0369] Optionally, RIS uses a non-unit weighting coefficient matrix for weighting.

[0370] Optionally, after the second communication device receives the third information, the second communication device may control or instruct the RIS to switch the weighting coefficient matrix it uses. Optionally, the RIS may use a preset non-unit weighting coefficient matrix for weighting. Alternatively, the second communication device determines a corresponding non-unit weighting coefficient matrix and instructs the RIS to use the non-unit weighting coefficient matrix, and the RIS uses the non-unit weighting coefficient matrix for weighting. For relevant examples of the second communication device determining a non-unit weighting coefficient matrix, please refer to the aforementioned Figure 2 Related introduction in the illustrated embodiment.

[0371] Optional, if Figure 5The illustrated embodiment further includes step 504 , and steps 505 to 506 may be performed after step 504 .

[0372] In an embodiment of the present application, a first communication device receives a first reference signal from a second communication device through RIS. Then, the first communication device measures the first reference signal to obtain a channel characteristic of a channel between the first communication device and the second communication device, the channel characteristic being obtained by measuring the first reference signal based on the first information and / or the second information, the first information being used to indicate whether to enhance the rank indicated by the RI information, and / or, being used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information being used to indicate the first rank, and / or, the second information being used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank being greater than or equal to the rank indicated by the RI information, and at least one propagation path being the propagation path between the first communication device and the second communication device. The first communication device sends first channel characteristic information to the second communication device; wherein the first channel characteristic information includes channel characteristics and status information, the status information being used to indicate that the channel characteristics are obtained based on the first information and / or the second information; or, the first channel characteristic information includes the first information and / or the second information, and the channel characteristics. This avoids the problem that in some scenarios, enhancing the rank used for communication leads to a sharp drop in system performance gain. It is beneficial to improve system capacity and thus ensure communication performance.

[0373] The communication device provided in the embodiment of the present application is described below.

[0374] Figure 6 This is a schematic diagram of the structure of the communication device of the embodiment of the present application. Figure 6 , the communication device 600 can be used to perform Figure 2 , Figure 4 and Figure 5 For details of the process performed by the first communication device in the illustrated embodiment, please refer to the relevant introduction in the above method embodiment.

[0375] The communication device 600 includes a transceiver module 601 and a processing module 602 .

[0376] The processing module 602 is used for data processing. The transceiver module 601 can realize the corresponding communication function. The transceiver module 601 can also be called a communication interface or a communication module.

[0377] Optionally, the communication device 600 may further include a storage module, which may be used to store instructions and / or data. The processing module 602 may read the instructions and / or data in the storage module so that the communication device implements the aforementioned method embodiment.

[0378] The communication device 600 can be used to perform the actions performed by the first communication device in the above method embodiment. The communication device 600 can be a first communication device or a component that can be configured in the first communication device. The processing module 602 is used to perform the processing-related operations on the first communication device side in the above method embodiment. The transceiver module 601 is used to perform the reception-related operations on the first communication device side in the above method embodiment.

[0379] For example, the communication device 600 is used to execute the following scheme:

[0380] The transceiver module 601 is used to receive a first reference signal from a second communication device through the RIS; the processing module 602 is used to measure the first reference signal to obtain the channel parameters of the channel between the communication device 600 and the second communication device; the transceiver module 601 is also used to send first information and / or second information to the second communication device, wherein the first information and / or the second information is determined according to the channel parameters, the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of the at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the communication device 600 and the second communication device.

[0381] For another example, the communication device 600 is used to execute the following solution:

[0382] The transceiver module 601 is used to receive a first reference signal from a second communication device through the RIS; the processing module 602 is used to measure the first reference signal to obtain first channel characteristic information and second channel characteristic information, the first channel characteristic information includes a first rank, the first rank is greater than the rank indicated by the RI information, and the second channel characteristic information is determined based on the first channel characteristic information; the transceiver module 601 is also used to send the first channel characteristic information and the second channel characteristic information to the second communication device.

[0383] For another example, the communication device 600 is used to execute the following solution:

[0384] The transceiver module 601 is used to receive a first reference signal from a second communication device through the RIS; the processing module 602 is used to measure the first reference signal to obtain channel characteristics between the communication device 600 and the second communication device, where the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information, the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or, to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or, the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the communication device 600 and the second communication device; the transceiver module 601 is also used to send first channel characteristic information to the second communication device; wherein the first channel characteristic information includes channel characteristics and status information, and the status information is used to indicate that the channel characteristics are obtained based on the first information and / or the second information; or, the first channel characteristic information includes the first information and / or the second information, and the channel characteristics.

[0385] For other implementations, see the previous Figure 2 , Figure 4 and Figure 5 The relevant introduction in the illustrated embodiment will not be repeated here.

[0386] Optionally, the transceiver module 601 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiment. The receiving module is used to perform the receiving operation in the above method embodiment.

[0387] It should be noted that the communication device 600 may include a sending module but not a receiving module. Alternatively, the communication device 600 may include a receiving module but not a sending module. Specifically, it depends on whether the above solution executed by the communication device 600 includes a sending action and a receiving action.

[0388] Optionally, the communication device 600 is used to perform the above Figure 2 , Figure 4 and Figure 5 The actions performed by the first communication device in the embodiment shown are as follows. Figure 2 , Figure 4 and Figure 5 The relevant introduction in the illustrated embodiment will not be expanded in detail here.

[0389] It should be understood that the specific process of each module executing the above corresponding process has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0390] The processing module 602 in the above embodiment can be implemented by at least one processor or processor-related circuit. The transceiver module 601 can be implemented by a transceiver or a transceiver-related circuit. The transceiver module 601 can also be called a communication module or a communication interface. The storage module can be implemented by at least one memory.

[0391] Figure 7 This is a schematic diagram of the structure of the communication device of the embodiment of the present application. Figure 7 , the communication device 700 can be used to perform Figure 2 , Figure 4 For details of the process performed by the second communication device in the embodiment shown in the figure, please refer to the relevant introduction in the above method embodiment.

[0392] The communication device 700 includes a transceiver module 701. Optionally, the communication device 700 also includes a processing module 702.

[0393] The processing module 702 is used for data processing. The transceiver module 701 can realize the corresponding communication function. The transceiver module 701 can also be called a communication interface or a communication module.

[0394] Optionally, the communication device 700 may further include a storage module, which may be used to store instructions and / or data. The processing module 702 may read the instructions and / or data in the storage module so that the communication device implements the aforementioned method embodiment.

[0395] The communication device 700 can be used to perform the actions performed by the second communication device in the above method embodiment. The communication device 700 can be a second communication device or a component that can be configured in the second communication device. The processing module 702 is used to perform the processing-related operations on the second communication device side in the above method embodiment. The transceiver module 701 is used to perform the reception-related operations on the second communication device side in the above method embodiment.

[0396] For example, the communication device 700 is used to execute the following scheme:

[0397] The transceiver module 701 is used to send a first reference signal to the first communication device through the RIS; receive first information and / or second information from the first communication device, wherein the first information and / or the second information is determined according to the channel parameters of the channel between the first communication device and the communication device 700, and the channel parameters are obtained by measuring the first reference signal. The first information is used to indicate whether to enhance the rank indicated by the RI information, and / or to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path. The second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path. The first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the communication device 700.

[0398] For another example, the communication device 700 is used to execute the following solution:

[0399] The transceiver module 701 is used to send a first reference signal to the first communication device through the RIS, and the RIS uses a unit weighting coefficient matrix for weighting; receive first channel characteristic information and second channel characteristic information from the first communication device, the first channel characteristic information includes a first rank, the first rank is greater than the rank indicated by the RI information, and the second channel characteristic information is determined based on the first channel characteristic information.

[0400] For another example, the communication device 700 is used to execute the following solution:

[0401] The transceiver module 701 is used to send a first reference signal to a first communication device via RIS; receive first channel characteristic information from the first communication device, the first channel characteristic information including channel characteristics and state information, or the first channel characteristic information including first information and / or second information, and channel characteristics; wherein the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information; the state information is used to indicate that the channel characteristics are obtained by measuring the first reference signal based on the first information and / or the second information; the first information is used to indicate whether to enhance the rank indicated by the RI information, and / or to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the communication device 700.

[0402] For other implementations, see the previous Figure 2 , Figure 4 and Figure 5 The relevant introduction in the illustrated embodiment will not be repeated here.

[0403] Optionally, the transceiver module 701 may include a sending module and a receiving module. The sending module is used to perform the sending operation in the above method embodiment. The receiving module is used to perform the receiving operation in the above method embodiment.

[0404] It should be noted that the communication device 700 may include a sending module but not a receiving module. Alternatively, the communication device 700 may include a receiving module but not a sending module. Specifically, it may depend on whether the above solution executed by the communication device 700 includes a sending action and a receiving action.

[0405] Optionally, the communication device 700 is used to perform the above Figure 2 , Figure 4 and Figure 5 The actions performed by the second communication device in the embodiment shown are as follows. Figure 2 , Figure 4 and Figure 5 The relevant introduction in the illustrated embodiment will not be expanded in detail here.

[0406] It should be understood that the specific process of each module executing the above corresponding process has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0407] The processing module 702 in the above embodiment can be implemented by at least one processor or processor-related circuit. The transceiver module 701 can be implemented by a transceiver or a transceiver-related circuit. The transceiver module 701 can also be called a communication module or a communication interface. The storage module can be implemented by at least one memory.

[0408] The present application also provides a communication device 800, which may be a terminal device, a processor in the terminal device, or a chip. The communication device 800 may be used to execute the operations executed by the first communication device or the second communication device in the above method embodiment.

[0409] When the communication device 800 is a terminal device, Figure 8 FIG. 1 shows a simplified schematic diagram of the structure of a terminal device. Figure 8 As shown, the terminal device includes a processor, a memory, and a transceiver. The memory can store computer program codes, and the transceiver includes a transmitter 831, a receiver 832, a radio frequency circuit (not shown in the figure), an antenna 833, and an input and output device (not shown in the figure).

[0410] The processor is mainly used to process communication protocols and communication data; control terminal devices,...

Claims

1. A method for sending information, It is characterized in that The method comprises: The first communication device receives a first reference signal from the second communication device via the configurable metasurface; The first communication device measures the first reference signal to obtain a channel parameter of a channel between the first communication device and the second communication device; The first communication device sends first information and / or second information to the second communication device, wherein the first information and / or the second information are determined based on the channel parameters, the first information is used to indicate whether to enhance the rank indicated by the rank indication RI information, and / or the first information is used to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path, the second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of the at least one propagation path, the first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the second communication device.

2. The method according to claim 1, It is characterized in that The channel parameters include: angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; the method further includes: The first communication device determines one or more path angle differences according to the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences according to the time delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences according to the Doppler information of the multiple propagation paths; The first communication device sending the first information and / or the second information to the second communication device includes: When at least one of the one or more radial angle differences is less than or equal to the radial angle difference threshold, or when at least one of the one or more radial delay differences is less than or equal to the radial delay difference threshold, or when at least one of the one or more radial Doppler information differences is less than or equal to the radial Doppler information difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device; wherein the first information is used to indicate the enhancement of the rank indicated by the RI information, and / or to indicate the increase of the power, eigenvalue or singular value of the at least one propagation path; or, When each of the one or more radial angle differences is greater than a radial angle difference threshold, or when each of the one or more path delay differences is greater than a path delay difference threshold, or when each of the one or more path Doppler information differences is greater than a path Doppler information difference threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of the at least one propagation path is not increased.

3. The method according to claim 1, It is characterized in that The channel parameter includes at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; the method further includes: The first communication device determines one or more path correlations according to at least one of the angles, powers, delays, and Doppler information of the multiple propagation paths; The first communication device sending the first information and / or the second information to the second communication device includes: When at least one path correlation among the one or more path correlations is greater than or equal to a path correlation threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate enhancement of the rank indicated by the RI information, and / or to indicate improvement of the power, eigenvalue or singular value of the at least one propagation path; or, When each of the one or more path correlations is less than the path correlation threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of the at least one propagation path is not increased.

4. The method according to claim 1, It is characterized in that The channel parameter includes at least one of the following: power, characteristic value, or singular value of multiple propagation paths between the first communication device and the second communication device; the method further includes: The first communication device determines one or more path power differences according to the powers of the multiple propagation paths, or the first communication device determines one or more path characteristic value differences according to the characteristic values ​​of the multiple propagation paths, or the first communication device determines one or more path singular value differences according to the singular values ​​of the multiple propagation paths; The first communication device sending the first information and / or the second information to the second communication device includes: When at least one of the one or more path power differences is greater than or equal to a path power difference threshold, or at least one of the one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one of the one or more path singular value differences is greater than or equal to a path singular value difference threshold, the first communication device sends the first information and the second information to the second communication device, or the first communication device sends the second information to the second communication device, wherein the first information is used to indicate enhancement of the rank indicated by the RI information, and / or to indicate improvement of the power, eigenvalue or singular value of the at least one propagation path; or, When each of the one or more path power differences is less than the path power difference threshold, or each of the one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each of the one or more path singular value differences is less than the path singular value difference threshold, the first communication device sends the first information to the second communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of the at least one propagation path is not increased.

5. The method according to any one of claims 1 to 4, It is characterized in that The second information includes the first rank, or includes an improvement amount of the first rank compared to the rank indicated by the RI information.

6. The method according to any one of claims 1 to 5, It is characterized in that The value of the first rank belongs to the interval [K, L path ], the K is the rank indicated by the RI information, the L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

7. The method according to any one of claims 1 to 6, It is characterized in that The configurable metasurface is weighted using a unit weighting coefficient matrix; when the first communication device sends the first information and the second information, wherein the first information is used to indicate an enhancement of the rank indicated by the RI information, or is used to indicate an increase in the power, eigenvalue, or singular value of at least one propagation path, or when the first communication device sends the second information, the method further includes: The first communication device sends third information to the second communication device, where the third information is used to instruct switching of a weighting coefficient matrix adopted by the configurable metasurface.

8. The method according to any one of claims 1 to 7, It is characterized in that The method further comprises: The first communication device receives a second reference signal from the second communication device via the configurable metasurface; The first communication device measures the second reference signal based on the first information and the second information, or measures the second reference signal based on the second information, to obtain first channel characteristic information, wherein the first channel characteristic information is channel characteristic information of a channel between the first communication device and the second communication device, and the first information is used to indicate enhancing the rank indicated by the RI information, and / or to indicate increasing the power, eigenvalue, or singular value of at least one propagation path; The first communication device sends the first channel characteristic information to the second communication device.

9. The method according to claim 8, It is characterized in that The method further comprises: The first communication device receives data from the second communication device, where the data is sent according to a data transmission parameter, and the data transmission parameter is determined by the second communication device according to the first channel characteristic information.

10. A method for receiving information, It is characterized in that The method comprises: The second communication device sends a first reference signal to the first communication device via the configurable metasurface; The second communication device receives first information and / or second information from the first communication device, wherein the first information and / or the second information are determined based on channel parameters between the first communication device and the second communication device, and the channel parameters are obtained by measuring the first reference signal. The first information is used to indicate whether to enhance the rank indicated by the rank indication RI information, and / or to indicate whether to increase the power, eigenvalue or singular value of at least one propagation path. The second information is used to indicate the first rank, and / or the second information is used to indicate the power increase amount, eigenvalue increase amount, or singular value increase amount of the at least one propagation path. The first rank is greater than or equal to the rank indicated by the RI information, and the at least one propagation path is the propagation path between the first communication device and the second communication device.

11. The method according to claim 10, It is characterized in that The channel parameters include angles, delays or Doppler information of multiple propagation paths between the first communication device and the second communication device; The second communication device receives the first information and / or the second information from the first communication device, including: When at least one of the one or more path angle differences is less than or equal to a path angle difference threshold, or when at least one of the one or more path delay differences is less than or equal to a path delay difference threshold, or when at least one of the one or more path Doppler information differences is less than or equal to a path Doppler information difference threshold, the second communication device receives the first information and the second information from the first communication device, or the second communication device receives the second information from the first communication device; wherein the first information is used to indicate enhancement of the rank indicated by the RI information, and / or to indicate improvement of the power, eigenvalue or singular value of at least one propagation path, the one or more path angle differences are determined based on the angles of the multiple propagation paths, the one or more path delay differences are determined based on the delays of the multiple propagation paths, and the one or more path Doppler information differences are determined based on the Doppler information of the multiple propagation paths; or, When each of the one or more radial angle differences is greater than a radial angle difference threshold, or when each of the one or more radial delay differences is greater than a radial delay difference threshold, or when each of the one or more radial Doppler information differences is greater than a radial Doppler information difference threshold, the second communication device receives the first information from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of the at least one propagation path is not increased, the one or more radial angle differences are determined based on the angles of the multiple propagation paths, the one or more radial delay differences are determined based on the delays of the multiple propagation paths, and the one or more radial Doppler information differences are determined based on the Doppler information of the multiple propagation paths.

12. The method according to claim 10, It is characterized in that The channel parameter includes at least one of the following: angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device; The second communication device receives the first information and / or the second information from the first communication device, including: When at least one path correlation among one or more path correlations is greater than or equal to a path correlation threshold, the second communication device receives the first information and the second information from the first communication device, or the second communication device receives the second information from the first communication device, wherein the first information is used to indicate enhancement of the rank indicated by the RI information, and / or to indicate improvement of the power, eigenvalue or singular value of the at least one propagation path, and the one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of multiple propagation paths between the first communication device and the second communication device; or, When each of the one or more path correlations is less than the path correlation threshold, the second communication device receives the first information from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or is used to indicate that the power, eigenvalue or singular value of the at least one propagation path is not increased, and the one or more path correlations are determined based on at least one of the angles, powers, delays, and Doppler information of multiple propagation paths between the first communication device and the second communication device.

13. The method according to claim 10, It is characterized in that The channel parameter includes at least one of the following: power, characteristic values, or singular values ​​of multiple propagation paths between the first communication device and the second communication device; The second communication device receives the first information and / or the second information from the first communication device, including: When at least one of the one or more path power differences is greater than or equal to a path power difference threshold, or at least one of the one or more path eigenvalue differences is greater than or equal to a path eigenvalue difference threshold, or at least one of the one or more path singular value differences is greater than or equal to a path singular value difference threshold, the second communication device receives the first information and the second information from the first communication device, or the second communication device receives the second information from the first communication device, wherein the first information is used to indicate enhancement of the rank indicated by the RI information, and / or to indicate improvement of the power, eigenvalue or singular value of at least one propagation path, the one or more path power differences are determined based on the powers of the multiple propagation paths, the one or more path eigenvalue differences are determined based on the eigenvalues ​​of the multiple propagation paths, and the one or more path singular value differences are determined based on the singular values ​​of the multiple propagation paths; or, When each of the one or more path power differences is less than the path power difference threshold, or each of the one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each of the one or more path singular value differences is less than the path singular value difference threshold, the second communication device receives the first information from the first communication device, wherein the first information is used to indicate that the rank indicated by the RI information is not enhanced, and / or to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased, the one or more path power differences are determined based on the powers of the multiple propagation paths, the one or more path eigenvalue differences are determined based on the eigenvalues ​​of the multiple propagation paths, and the one or more path singular value differences are determined based on the singular values ​​of the multiple propagation paths.

14. The method according to any one of claims 10 to 13, It is characterized in that The second information includes the first rank, or includes an improvement amount of the first rank relative to the rank indicated by the RI information.

15. The method according to any one of claims 10 to 14, It is characterized in that The value of the first rank belongs to the interval [K, L path ], the K is the rank indicated by the RI information, the L path is the total number of propagation paths between the first communication device and the second communication device; the value of the improvement of the first rank compared to the rank indicated by the RI information belongs to the interval [0, L path -K].

16. The method according to any one of claims 10 to 15, It is characterized in that The configurable metasurface is weighted using a unit weighting coefficient matrix; when the second communication device receives the first information and the second information from the first communication device, wherein the first information is used to indicate the enhancement of the rank indicated by the RI information, and / or is used to indicate the improvement of the power, eigenvalue or singular value of at least one propagation path; the method further includes: The second communication device receives third information from the first communication device, where the third information is used to switch the weighting coefficient matrix adopted by the configurable metasurface.

17. The method according to any one of claims 10 to 16, It is characterized in that The method further comprises: The second communication device sends a second reference signal to the first communication device via the configurable metasurface; The second communication device receives first channel characteristic information from the first communication device, where the first channel characteristic information is determined based on first channel information, and the first channel information is obtained by the first communication device measuring the second reference signal based on the first information and / or the second information, or the first channel information is obtained by the first communication device measuring the second reference signal based on the second information.

18. The method according to claim 17, It is characterized in that The method further comprises: The second communication device determines a data transmission parameter according to the first channel characteristic information; The second communication device sends data to the first communication device using the data transmission parameter.

19. A communication device, It is characterized in that The communication device includes a transceiver module and a processing module; the transceiver module is used to perform the transceiver operation of the method as described in any one of claims 1 to 9, and the processing module is used to perform the processing operation of the method as described in any one of claims 1 to 9.

20. A communication device, It is characterized in that The communication device comprises a transceiver module, and the transceiver module is used to perform the transceiver operation of the method according to any one of claims 10 to 18.

21. The communication device according to claim 20, It is characterized in that The communication device further comprises a processing module, wherein the processing module is configured to execute the processing operation of the method according to any one of claims 10 to 18.

22. A communication device, It is characterized in that The communication device comprises a processor configured to execute a computer program or computer instructions in a memory to perform the method according to any one of claims 1 to 18.

23. A computer-readable storage medium, It is characterized in that A computer program is stored thereon, and when the computer program is executed by a communication device, the communication device executes the method according to any one of claims 1 to 18.

24. A communication system, It is characterized in that The communication system comprises a first communication device and a second communication device; the first communication device is used to execute the method according to any one of claims 1 to 9, and the second communication device is used to execute the method according to any one of claims 10 to 18.

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