Method for sending information, method for receiving information, and related apparatus

Abstract

The present application provides a method for sending information. A first communication apparatus receives a first reference signal from a second communication apparatus by means of a configurable super-surface; the first communication apparatus measures the first reference signal, and obtains channel parameters of a channel between the first communication apparatus and the second communication apparatus; the first communication apparatus sends first information and / or second information to the second communication apparatus, the first information and / or the second information being determined on the basis of the channel parameters. The first information is used for indicating whether to enhance the rank indicated by rank indication (RI) information, and / or is used for indicating whether to increase the power, the eigenvalue, or the singular value of at least one propagation path. The second information is used for indicating a first rank, and / or is used for indicating the power boost amount, the eigenvalue boost amount, or the singular value boost 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 a propagation path between the first communication apparatus and the second communication apparatus.

Description

Information sending method, information receiving method and related devices

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on November 22, 2023, with application number 202311574830.0 and application name “Information Sending Method, Information Receiving Method and Related Devices”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] Multiple-input, multiple-output (MIMO) technology leverages spatial resources to achieve array gain, multiplexing and diversity gain, and interference cancellation gain in space without increasing system bandwidth, exponentially increasing the capacity and spectral efficiency of communication systems. However, with increasing demands for high-speed, high-reliability, and low-latency communications, modern communication systems will continue to face challenges in achieving greater capacity, wider coverage, and lower latency. These requirements have become key requirements for next-generation communication systems.

[0004] In order to meet the above challenges, Reconfigurable Intelligent Surfaces (RIS) has begun to be widely studied as a technology with great potential. As shown in Figure 1A, RIS, as an intermediate node, presents a forwarding function similar to that of a relay or an integrated access backhaul (IAB). As shown in Figure 1A, 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.

[0005] However, the system performance gain is only observed when the channel quality of the H0 channel is poor. When the channel quality of the H0 channel is good, no system performance gain is observed. This shows that the above technical solution of increasing the rank used for communication is limited in the scenarios where the system performance gain is achieved.

[0006] Summary of the Invention

[0007] This application provides an information sending method, an information receiving method, and related devices for use by a first communication device to send first information and / or second information to a second communication device. This method avoids the problem in some scenarios where increasing the rank used for communication can lead to a sharp decrease in system performance gain. This method is beneficial for improving system capacity, thereby ensuring communication performance.

[0008] In a first aspect, the present application provides an information sending 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 channel parameters 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 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.

[0009] Optionally, the RI information refers to 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. In other words, the RI information can be 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, 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, the RIS is located on the surface of the first communication device or the second communication device. The RIS is a reflective layer. The RIS can also be called a configurable metasurface, a meta-surface, or a 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 the RIS.

[0010] In the above technical solution, 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. The first information and / or the second information are determined based on 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 amount of power increase, eigenvalue increase, or singular value increase 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. The first communication device sends the first information and / or the second information to the second communication device. This avoids the problem that enhancing 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. This achieves a reasonable improvement in the rank used for communication, which is beneficial to improving system capacity.

[0011] 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.

[0012] 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 based on the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences based on the delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences based on 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 path angle difference among the one or more path angle differences is less than or equal to the path angle difference threshold, or 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, or when at least one path Doppler information difference among 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 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, 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 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 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 helps the first communication device reasonably improve the rank used for communication and improve system capacity. This avoids the problem that in some scenarios, the rank used for communication is enhanced but the system performance gain is reduced.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 path Doppler information differences is less than 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 improvement of at least one The power, eigenvalue or singular value of the 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 is used to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0013] Based on the first aspect, in a possible implementation manner, the channel parameter includes at least one of the following: angle, power, delay, 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, power, delay, and Doppler information of the multiple propagation paths; the first communication device sends first information and / or 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 whether to enhance the rank indicated by the RI information and / or to indicate to increase 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 enabling the first communication device to reasonably improve the rank used for communication and improve system capacity. It avoids the problem that in some scenarios, the rank used for communication is enhanced but the system performance gain is reduced. 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 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 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.

[0014] Based on the first aspect, in a possible implementation, the channel parameters include at least one of the following: power, eigenvalue, 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 based on the power 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; 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 in 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 in 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 in 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 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 indicates enhancing the rank indicated by the RI information and / or indicates increasing the power, eigenvalue, or singular value of at least one propagation path. Alternatively, 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 first information to the second communication device, wherein the first information indicates not enhancing the rank indicated by the RI information and / or indicates not increasing the power, eigenvalue, or singular value of at least one propagation path. Thus, it can be seen that the first communication device determines the first information and / or second information based on the power, eigenvalue, or singular value of multiple propagation paths between the first and second communication devices. This facilitates the first communication device to reasonably improve the rank used for communication and improve system capacity. This avoids the problem that in some scenarios, the rank used for communication is enhanced but the system performance gain is reduced.Optionally, when at least one path power difference among one or more path power differences is greater than a path power difference threshold, or when at least one path characteristic value difference among one or more path eigenvalue differences is greater than a path characteristic value difference threshold, or when at least one path singular value difference among one or more path singular value differences is greater than a 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 path power difference among one or more path power differences is less than or equal to the path power difference threshold, or each path characteristic value difference among one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each path singular value difference among 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.

[0015] Based on the first aspect, in one possible implementation, the second information includes the first rank, or includes an increase in 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, enriching the implementation of the solution. Furthermore, the second information includes an increase in the first rank compared to the rank indicated by the RI information, which helps reduce the signaling overhead generated by the first communications device indicating the first rank.

[0016] 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 falls within 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 value does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0017] Based on the first aspect, in one possible implementation, the RIS uses a unit weighting matrix for weighting. When a first communication device sends first information and second information, where the first information indicates the rank indicated by the enhanced RI information or indicates 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 indicates a switch in the weighting matrix used in the RIS. This facilitates subsequent communication between the first and second communication devices based on the enhanced rank or at least one propagation path enhanced in power, eigenvalue, or singular value. This is beneficial for improving system capacity.

[0018] Based on the first aspect, in one possible implementation, the method further includes: a first communication device receiving a second reference signal from a second communication device via a RIS; the first communication device measuring the second reference signal based on the first information and the second information, or measuring the second reference signal based on the second information, to obtain first channel characteristic information, where the first channel characteristic information is 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 is used to indicate an increase in the power, eigenvalue, or singular value of at least one propagation path; and the first communication device sending the first channel characteristic information to the second communication device. Thus, 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. This facilitates the second communication device, after obtaining the first channel characteristic information, to select appropriate data transmission parameters for data transmission with the first communication device based on the first channel characteristic information. This facilitates 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, thereby enabling the first communication device and the second communication device to communicate based on the enhanced first rank, which facilitates improving system capacity. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0019] Based on the first aspect, in one possible implementation, the method further includes: a first communication device receiving data from a second communication device, where the data is sent according to data transmission parameters, and the data transmission parameters are determined by the second communication device based on the first channel characteristic information. This helps ensure 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, thereby enabling the first communication device and the second communication device to transmit data based on the enhanced first rank, which helps improve system capacity.

[0020] In a second aspect, the present application provides an information receiving method, comprising: a second communication device sending a first reference signal to a first communication device via a RIS; and the second communication device receiving first information and / or second information from the first communication device, wherein the first information and / or second information are determined based on channel parameters of a channel between the first communication device and the second communication device, the channel parameters being obtained by measuring the first reference signal, 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 amount of power increase, eigenvalue increase, or singular value increase of at least one propagation path, the first rank being greater than or equal to the rank indicated by the RI information, and the at least one propagation path being the propagation path between the first communication device and the second communication device. Alternatively, the RI information may be rank information obtained based on a conventional rank information measurement method, and the rank information may be obtained simultaneously during the measurement of the first reference signal, or may be obtained in a measurement process other than the measurement of the first reference signal. For example, the first communication device may obtain the rank information before the measurement 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 may also be referred to as a configurable metasurface, meta-surface, or super-surface, though this application does not limit this. Optionally, the at least one propagation path includes a propagation path between the first communication device and the second communication device that passes through the RIS.

[0021] In the above technical solution, 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. 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 may lead to a sharp decrease in system performance gain. The first communication device instructs 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 beneficial to improving system capacity.

[0022] 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.

[0023] 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 second information from the first communication device, including: 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 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 radial 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 path angle difference in the one or more path angle differences is greater than a path angle difference threshold, or when each path delay difference in the one or more path delay differences is greater than a path delay difference threshold, or when each path Doppler information difference in the one or more path Doppler information differences is greater than a 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 is used 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 helps the first communication device reasonably improve the rank used for communication and improve system capacity, and avoids 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 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 path Doppler information differences is less than 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 improvement of at least one The power, eigenvalue or singular value of the 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 is used to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0024] 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 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 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 a path correlation threshold, the second communication device receives 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, eigenvalues, or singular values ​​of at least one propagation path are 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. 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 helps the first communication device reasonably improve the rank used for communication and improve system capacity. This avoids the problem that in some scenarios, the rank used for communication is enhanced but the system performance gain is reduced. 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 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 to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0025] 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 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 the path power difference threshold, or at least one path eigenvalue difference among 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 one or more path singular value differences is greater than or equal to the 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 to indicate to increase 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 the 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. As can be seen, the first communication device determines the first information and / or the second information based on the power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device. This facilitates the first communication device to reasonably improve the rank used for communication and increase system capacity. This avoids the problem of increasing the rank used for communication but reducing system performance gains in some scenarios.Optionally, when at least one path power difference among one or more path power differences is greater than a path power difference threshold, or when at least one path characteristic value difference among one or more path eigenvalue differences is greater than a path characteristic value difference threshold, or when at least one path singular value difference among one or more path singular value differences is greater than a 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 path power difference among one or more path power differences is less than or equal to the path power difference threshold, or each path characteristic value difference among one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each path singular value difference among 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.

[0026] Based on the second aspect, in one possible implementation, the second information includes the first rank, or includes an increase in 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, enriching the implementation of the solution. Furthermore, the second information includes an increase in the first rank relative to the rank indicated by the RI information, which helps reduce the signaling overhead generated by the first communications device indicating the first rank.

[0027] 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 falls within 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 value does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0028] Based on the second aspect, in one possible implementation, the RIS uses a unit weighting matrix for weighting. When a second communication device receives first information and second information from a first communication device, where the first information indicates the rank indicated by the enhanced RI information and / or indicates an increase in 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 matrix used in the RIS. This facilitates subsequent communication between the first and second communication devices based on the enhanced rank or at least one propagation path enhanced in power, eigenvalue, or singular value. This is beneficial for improving system capacity.

[0029] Based on the second aspect, in one possible implementation, the method further includes: the second communication device sending a second reference signal to the first communication device via the RIS; the second communication device receiving first channel characteristic information from the first communication device, where 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. This facilitates the second communication device to select appropriate data transmission parameters for data transmission with the first communication device based on the first channel characteristic information after obtaining the first channel characteristic information. This helps ensure 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, thereby enabling the first communication device and the second communication device to communicate based on the enhanced first rank, which helps improve system capacity. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0030] Based on the second aspect, in one possible implementation, the method further includes: a second communication device determining a data transmission parameter based on the first channel characteristic information; and the second communication device sending data to the first communication device using the data transmission parameter. This helps ensure 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, thereby enabling the first communication device and the second communication device to transmit data based on the enhanced first rank, which helps improve system capacity.

[0031] A third aspect of the present application provides an information transmission method, comprising: a first communication device receiving a first reference signal from a second communication device via a RIS; the first communication device measuring the first reference signal to obtain first channel characteristic information and second channel characteristic information, the first channel characteristic information including a first rank, the first rank being greater than the rank indicated by the RI information, and the second channel characteristic information being determined based on the first channel characteristic information; and the first communication device transmitting 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 the enhanced first rank, which is beneficial for improving system performance gain and system capacity. Alternatively, 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 first reference signal measurement process, or may be obtained through a measurement process distinct from the first reference signal measurement process. For example, the first communication device may obtain the rank information before the first reference signal measurement process. 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 may also be referred to as a configurable metasurface, meta-surface, or super-surface, though this application does not limit this. 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.

[0032] Based on the third aspect, in a possible implementation, RIS uses a weighting coefficient matrix for weighting.

[0033] Based on the third aspect, in one possible implementation, the method further includes: the first communication device sending 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, thereby facilitating the second communication device to learn that the second channel characteristic information is determined based on the enhanced rank.

[0034] Based on the third aspect, in one possible implementation, a first communication device measures a first reference signal to obtain first channel characteristic information, including: the first communication device measures the first reference signal to obtain channel parameters of a channel between the first communication device and a second communication device; and the first communication device determines the first channel characteristic information based on the channel parameters. This enables the first communication device to determine the rank indicated by the enhanced RI information based on the channel parameters, thereby reasonably improving the rank used for communication and facilitating improved system capacity.

[0035] Based on the third aspect, in one 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 further includes: the first communication device determines one or more path angle differences based on the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences based on the delays of the multiple propagation paths, or the first communication device determines 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. Alternatively, at least one of the one or more path angle differences is less than a path angle threshold, or the one or more path delay differences are less than a path delay difference threshold, or the one or more path Doppler information differences are less than a path Doppler information difference. Alternatively, at least one of the one or more path angle differences is less than a path angle threshold, or the one or more path delay differences are less than a path delay difference threshold, or the one or more path Doppler information differences are less than a 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 communications device can determine the rank indicated by the enhanced RI information. Reasonable improvement of the rank used for communication is beneficial to improving system capacity.

[0036] Based on the third aspect, in one 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 further includes: the first communication device determining 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 the path correlation threshold. Thus, if 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. This achieves a reasonable improvement in the rank used for communication, which is beneficial to improving system capacity.

[0037] Based on the third aspect, in one possible implementation, the channel parameters include power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device; the method further includes: the first communication device determining one or more path power differences based on the power of the multiple propagation paths, or the first communication device determining one or more path eigenvalue differences based on the eigenvalues ​​of the multiple propagation paths, or the first communication device determining one or more path singular value differences based on 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 a 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 a 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 a path singular value difference threshold. Alternatively, when at least one path power difference among the one or more path power differences is greater than a path power difference threshold, or at least one path eigenvalue difference among the one or more path eigenvalue differences is greater than a path eigenvalue difference threshold, or at least one path singular value difference among the one or more path singular value differences is greater than a path singular value difference threshold. Thus, when at least one of the one or more path power differences is greater than or equal to the path power difference threshold, or when at least one of the one or more path eigenvalue differences is greater than or equal to the path eigenvalue difference threshold, or when 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 communications device can determine the rank indicated by the enhanced RI information. Reasonable improvement of the rank used for communication is beneficial to improving system capacity.

[0038] 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 facilitates the implementation of the solution. For the first rank, the maximum value does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0039] Based on the third aspect, in one possible implementation, the RIS employs a unit weighting matrix for weighting. The method further includes: the first communication device transmitting switching information to the second communication device, the switching information being used to instruct a switch in the weighting matrix employed by the RIS. This facilitates subsequent communication between the first and second communication devices based on the enhanced rank, thereby facilitating improved system capacity.

[0040] Based on the third aspect, in one possible implementation, the method further includes: a first communication device receiving data from a second communication device via a RIS, where the data is sent based on data transmission parameters determined based on the first channel characteristic information and the second channel characteristic information. This enables data transmission between the first communication device and the second communication device based on the enhanced first rank, which is beneficial for improving system capacity. Optionally, the RIS employs a non-unit weighting coefficient matrix for weighting.

[0041] A fourth aspect of the present application provides an information receiving method, comprising: a second communication device sending a first reference signal to a first communication device via a RIS; and the second communication device receiving first channel characteristic information and second channel characteristic information from the first communication device, wherein the first channel characteristic information includes a first rank, which 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. This facilitates the second communication device to communicate with the first communication device using the enhanced first rank, which is beneficial for improving system performance gain and system capacity. Alternatively, the RI information can be rank information obtained based on a traditional rank information measurement method. This rank information can be obtained simultaneously during the measurement of the first reference signal, or can be obtained through a measurement process different from the measurement of the first reference signal. For example, the first communication device can obtain this rank information before the measurement 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 may also be referred to as a configurable metasurface, meta-surface, or super-surface, the specific details of which are 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 that passes through the RIS.

[0042] Based on the fourth aspect, in a possible implementation, RIS uses a weighting coefficient matrix for weighting.

[0043] 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.

[0044] Based on the fourth aspect, in one 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 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. Alternatively, at least one of the one or more path angle differences is less than a path angle threshold, or the one or more path delay differences are less than a path delay difference threshold, or the one or more path Doppler information differences are less than a 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 Doppler information of the multiple propagation paths.

[0045] 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 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.

[0046] Based on the fourth aspect, in a possible implementation method, the channel parameters include the power, eigenvalue, or singular value of multiple propagation paths between the first communication device and the second communication device; 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, 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.

[0047] Based on the fourth aspect, in one possible implementation, the method further includes: the second communication device receiving indication information from the first communication device, the indication information being used to indicate that the second channel characteristic information is determined based on the first rank, thereby facilitating the second communication device to learn that the second channel characteristic information is determined based on the enhanced rank.

[0048] 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 facilitates the implementation of the solution. For the first rank, the maximum value does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0049] Based on the fourth aspect, in one possible implementation, the RIS employs a weighting coefficient matrix for weighting; the method further includes: the second communication device receiving switching information from the first communication device, the switching information being used to instruct a switch in the weighting coefficient matrix employed by the RIS. This facilitates subsequent communication between the first communication device and the second communication device based on the enhanced rank, thereby facilitating improved system capacity.

[0050] Based on the fourth aspect, in one possible implementation, the method further includes: the second communication device determining a data transmission parameter based on the first channel characteristic information and the second channel characteristic information; and the second communication device transmitting data to the first communication device via the RIS based on the data transmission parameter. Optionally, the RIS employs a non-unit weighting coefficient matrix. This enables data transmission between the first and second communication devices based on the enhanced first rank, thereby improving system capacity.

[0051] 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 via a 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 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 the at least one propagation path being the propagation path between the first communication device and the second communication device; the first communication device sending 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, as well as the channel characteristics. This avoids 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. 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, the 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 the RIS.

[0052] Based on the fifth aspect, in a possible implementation, RIS uses a weighting coefficient matrix for weighting.

[0053] Based on the fifth aspect, in one possible implementation, the method further includes: the first communication device determining the first information and / or the second information based on channel parameters of a channel between the first communication device and the second communication device, where the channel parameters are obtained by measuring a 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 facilitates achieving a reasonable improvement in the rank used for communication and improves system capacity.

[0054] 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 based on 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 based on the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences based on the delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences based on the Doppler information of the multiple propagation paths; when at least one path angle difference among the one or more path angle differences is less than or equal to the path angle threshold, or 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, or when one or more path Doppler When at least one path-Doppler information difference in the RI information difference is less than or equal to the path-Doppler information difference threshold, the first communication device determines first information and second information, or the first communication device determines 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; 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 first 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. This facilitates the first communication device to reasonably enhance the rank used for communication and improve system capacity. This avoids the problem that in some scenarios, the rank used for communication is enhanced but the system performance gain is reduced.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 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 to indicate not to increase the power, characteristic value or singular value of at least one propagation path.

[0055] Based on the fifth aspect, in one possible implementation, the channel parameters include at least one of the following: angle, power, delay, 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 based on 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 based on at least one of the angles, power, delay, and Doppler 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 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; 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 whether to not enhance the rank indicated by the RI information and / or to indicate whether to not increase the power, eigenvalue, or singular value of at least one propagation path. This facilitates the first communication device to reasonably improve the rank used for communication and improve system capacity. Avoid the problem that the rank for communication is enhanced but the system performance gain decreases in some scenarios. 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.

[0056] Based on the fifth aspect, in a possible implementation method, the channel parameters include at least one of the following: the 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 based on 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 based on the power of the multiple propagation paths, or the first communication device determines one or more path characteristic value differences based on the characteristic values ​​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; 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 a path singular value difference threshold, the first communication device determines first information and second information, or the first communication device determines second information, wherein the first information indicates enhancing the rank indicated by the RI information and / or indicates increasing 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 first information, wherein the first information indicates not enhancing the rank indicated by the RI information and / or indicates not increasing the power, eigenvalue, or singular value of at least one propagation path. Thus, it can be seen that the first communication device determines the first information and / or 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 facilitates the first communication device to reasonably improve the rank used for communication and improve system capacity. This avoids the problem that in some scenarios, the rank used for communication is enhanced but the system performance gain is reduced.Optionally, when at least one path power difference among one or more path power differences is greater than a path power difference threshold, or when at least one path characteristic value difference among one or more path eigenvalue differences is greater than a path characteristic value difference threshold, or when at least one path singular value difference among one or more path singular value differences is greater than a path singular value difference threshold, the first communication device determines first information and 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 or equal to the path power difference threshold, or each path characteristic value difference among one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each path singular value difference among 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 to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0057] Based on the fifth aspect, in one possible implementation, the second information includes the first rank, or includes the amount by which the first rank is increased compared to the rank indicated by the RI information. Two possible implementations of the second information indicating the first rank are shown, enriching the implementation of the solution. Furthermore, the second information includes the amount by which the first rank is increased compared to the rank indicated by the RI information, which helps reduce the signaling overhead generated by the first communications device indicating the first rank.

[0058] 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 falls within 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 value does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0059] Based on the fifth aspect, in one possible implementation, the RIS uses a unit weighting 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 method further includes: the first communication device sends third information to the second communication device, the third information indicating a switch in the weighting matrix used in the RIS. This facilitates subsequent communication between the first and second communication devices based on the enhanced rank or at least one propagation path enhanced in power, eigenvalue, or singular value, thereby improving system capacity.

[0060] Based on the fifth aspect, in one possible implementation, the method further includes: a first communication device receiving data from a second communication device via a RIS, where the data is sent according to data transmission parameters determined based on first channel characteristic information. This helps ensure communication performance. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting. 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, thereby enabling data transmission between the first communication device and the second communication device based on the enhanced first rank, which helps improve system capacity.

[0061] In a sixth aspect, 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 a RIS; the second communication device receives 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 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 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. This avoids the problem that in some scenarios, enhancing the rank used for communication leads to a sharp drop in system performance gain. This is conducive to improving 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. 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, meta-surface, or 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.

[0062] Based on the sixth aspect, in a possible implementation, RIS uses a weighting coefficient matrix for weighting.

[0063] 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.

[0064] 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 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 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 one or more path angle differences are determined based on the angles of the multiple propagation paths, and the 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, 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. 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 that the rank indicated by the enhanced RI information is / are to be indicated, and / or to indicate that the power, characteristic value or singular value of at least one propagation path is increased; 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 that the rank indicated by the RI information is not to be enhanced, and / or to indicate that the power, characteristic value or singular value of at least one propagation path is not to be increased.

[0065] Based on the sixth aspect, in a possible implementation method, the channel parameters include at least one of the following: the angle, power, delay, 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 the path correlation 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, 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, power, delay, and Doppler information of the multiple propagation paths between the first communication device and the second communication device; or, when each path correlation in 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, power, delay, 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 to be increased; or, when each path correlation 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.

[0066] Based on the sixth aspect, in a possible implementation method, the channel parameters include at least one of the following: the power, eigenvalue or singular value 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 the path power difference threshold, or at least one path eigenvalue difference among 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 one or more path singular value differences is greater than or equal to 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 an increase in the power, eigenvalue or singular value of at least one propagation path, the one or more path power differences are determined based on the power of multiple propagation paths, and the 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, the one or more path power differences are determined based on the power of multiple propagation paths, the one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and the 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 the 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, the one or more path power differences are determined based on the power of multiple propagation paths, the one or more path eigenvalue differences are determined based on the eigenvalues ​​of multiple propagation paths, and the one or more path singular value differences are determined based on the singular values ​​of multiple propagation paths. Optionally, when at least one path power difference among one or more path power differences is greater than the path power difference threshold, or when at least one path characteristic value difference among one or more path eigenvalue differences is greater than the path characteristic value difference threshold, or when at least one path singular value difference among 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 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 or equal to the path power difference threshold, or each path eigenvalue difference among one or more path eigenvalue differences is less than or equal to the path eigenvalue difference threshold, or each path singular value difference among 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.

[0067] Based on the sixth aspect, in one possible implementation, the second information includes the first rank, or includes an increase in 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, enriching the implementation of the solution. Furthermore, the second information includes an increase in the first rank relative to the rank indicated by the RI information, which helps reduce the signaling overhead generated by the first communications device indicating the first rank.

[0068] 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 falls within 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 value does not exceed the total number of propagation paths between the first communication device and the second communication device.

[0069] Based on the sixth aspect, in one possible implementation, the RIS uses a unit weighting 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 method further includes: a second communication device receiving third information from the first communication device, the third information being used to switch the weighting matrix used in the RIS. This facilitates subsequent communication between the first and second communication devices based on the enhanced rank or at least one propagation path enhanced in power, eigenvalue, or singular value, thereby improving system capacity.

[0070] Based on the sixth aspect, in one possible implementation, the method further includes: the second communication device determining data transmission parameters based on the first channel characteristic information; and the second communication device sending data to the first communication device via the RIS based on the data transmission parameters. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting. This helps ensure 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, thereby enabling data transmission between the first communication device and the second communication device based on the enhanced first rank, which helps improve system capacity.

[0071] A seventh aspect of the present application provides a first communication device, including:

[0072] a transceiver module, configured to receive a first reference signal from a second communication device via the RIS;

[0073] 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;

[0074] The transceiver module 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 are 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.

[0075] Based on the seventh aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting.

[0076] 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 based on the angles of the multiple propagation paths, or the first communication device determines one or more path delay differences based on the delays of the multiple propagation paths, or the first communication device determines one or more path Doppler information differences based on the Doppler information of the multiple propagation paths; the transceiver module is specifically used to: when at least one path angle difference among the one or more path angle differences is less than or equal to the path angle difference threshold, or 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, or when at least one path Doppler information difference among the one or more path Doppler information differences is less than or equal to the path delay difference threshold. 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 that the rank indicated by the enhanced RI information is enhanced, and / or is used to indicate that the power, characteristic value or singular value of at least one propagation path is increased; 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 that the rank indicated by the RI information is not enhanced, and / or is used to indicate that the power, characteristic value or singular value of at least one propagation path is not increased.

[0077] Based on the seventh aspect, in a possible implementation method, the channel parameters include at least one of the following: angle, power, delay, 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 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, 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.

[0078] Based on the seventh aspect, in a possible implementation method, the channel parameters include at least one of the following: the power, eigenvalue, or singular value 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; the transceiver module is specifically used to: when at least one path power difference in one or more path power differences is greater than or equal to the path power difference threshold, or at least one path eigenvalue difference in 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 in one or more path singular value differences is greater than or equal to the path When the singular value difference threshold is exceeded, 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 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 the 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 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 to indicate not to increase the power, eigenvalue or singular value of at least one propagation path.

[0079] Based on the seventh 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.

[0080] 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 falls within the interval [0, L path -K].

[0081] Based on the seventh aspect, in one possible implementation, 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 the weighting coefficient matrix used for switching the RIS.

[0082] Based on the seventh aspect, in one possible implementation, the transceiver module is further configured to: receive a second reference signal from a second communication device via the RIS; the processing module is further configured 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 first channel characteristic information, where the first channel characteristic information is 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 an increase in the power, eigenvalue, or singular value of at least one propagation path; determine the first channel characteristic information based on the first channel information; and the transceiver module is further configured to: send the first channel characteristic information to the second communication device. Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting.

[0083] Based on the seventh aspect, in a possible implementation method, the transceiver module is also used to: receive data from the second communication device, the data is sent according to the data transmission parameters, and the data transmission parameters are determined by the second communication device according to the first channel characteristic information.

[0084] An eighth aspect of the present application provides a second communication device, including:

[0085] A transceiver module is configured to transmit a first reference signal to a first communication device via a RIS; and receive first information and / or second information from the first communication device, wherein the first information and / or second information are determined based on channel parameters of a channel between the first and second communication devices, the channel parameters being 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 a first rank and / or to indicate an amount of power increase, eigenvalue increase, or singular value increase for 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 and second communication devices. Optionally, the RIS employs a unit weighting coefficient matrix for weighting.

[0086] Based on the eighth aspect, in a possible implementation manner, 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.

[0087] Based on the eighth aspect, in a possible implementation method, the channel parameters include the 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 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, 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 the increase of the power, eigenvalue or singular value of at least one propagation path, and the 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 path angle difference in one or more path angle differences is greater than the path angle difference 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 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.

[0088] Based on the eighth aspect, in a possible implementation manner, the channel parameter includes at least one of the following: angle, power, delay, 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, Used to indicate that the power, eigenvalue or singular value of at least one propagation path is 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; or, when each path correlation in the one or more path correlations is less than a path correlation threshold, receiving 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, used to indicate that the power, eigenvalue or singular value of at least one propagation path is 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.

[0089] Based on the eighth aspect, in a possible implementation method, the channel parameters include at least one of the following: the 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 the path power difference threshold, or when 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 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, 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 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. The method comprises the following steps: receiving a first information 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, 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; or, when each path power difference in the one or more path power differences is less than the path power difference threshold, or each path eigenvalue difference in the one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each path singular value difference in the one or more path singular value differences is less than the path singular value difference threshold, and receiving 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 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.

[0090] 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 falls within the interval [0, L path -K].

[0091] Based on the eighth aspect, in one possible implementation, RIS uses a unit weighting coefficient matrix for weighting; when the second communication device receives first information and 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 third information from the first communication device, and the third information is used to switch the weighting coefficient matrix used by RIS.

[0092] Based on the eighth aspect, in one possible implementation, the transceiver module is further configured to: transmit a second reference signal to the first communication device via the RIS; and receive first channel characteristic information from the first communication device, where the first channel characteristic information is determined based on the first channel information, the first channel information being obtained by the first communication device by measuring the second reference signal based on the first information and / or the second information, or the first channel information being obtained by the first communication device by measuring the second reference signal based on the second information. Optionally, the RIS employs a non-unit weighting coefficient matrix for weighting.

[0093] 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 based on the first channel characteristic information; the transceiver module is also used to: send data to the first communication device through the data transmission parameters.

[0094] A ninth aspect of the present application provides a first communication device, including:

[0095] a transceiver module, configured to receive a first reference signal from a second communication device via the RIS;

[0096] a processing module, configured to measure a first reference signal to obtain first channel characteristic information and second channel characteristic information, where 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;

[0097] The transceiver module is further used to send the first channel characteristic information and the second channel characteristic information to the second communication device.

[0098] Based on the ninth aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting.

[0099] Based on the ninth aspect, in a possible implementation method, the transceiver module is further 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.

[0100] Based on the ninth aspect, in a possible implementation, the processing module is further 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 based on the channel parameters.

[0101] 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.

[0102] Based on the ninth aspect, in a possible implementation method, the channel parameters include the angle, power, delay, 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 angle, power, delay, and Doppler information of the multiple propagation paths, wherein at least one path correlation among the one or more path correlations is less 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.

[0103] Based on the ninth aspect, in a possible implementation method, the channel parameters include the power, eigenvalue, or singular value 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 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.

[0104] 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.

[0105] Based on the ninth aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting; the transceiver module is further used to: send switching information to the second communication device, where the switching information is used to indicate switching the weighting coefficient matrix used by the RIS.

[0106] Based on the ninth aspect, in one possible implementation, the transceiver module is further configured to receive data from the second communication device via the RIS, where the data is sent based on data transmission parameters determined based on the first channel characteristic information and the second channel characteristic information. Optionally, the RIS employs a non-unit weighting coefficient matrix for weighting.

[0107] A tenth aspect of the present application provides a second communication device, including:

[0108] The transceiver module is used to send a first reference signal to the first communication device through the 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.

[0109] Based on the tenth aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting.

[0110] 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.

[0111] 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 diameter angle differences is less than or equal to a diameter angle threshold, or the one or more diameter delay differences are less than or equal to a diameter delay difference threshold, or the one or more diameter Doppler information differences are less than or equal to a diameter Doppler information difference. Alternatively, at least one of the one or more diameter angle differences is less than a diameter angle threshold, or the one or more diameter delay differences are less than a diameter delay difference threshold, or the one or more diameter Doppler information differences are less than a diameter Doppler information difference. The one or more diameter angle differences are determined based on the angles of the multiple propagation paths, the one or more diameter delay differences are determined based on the delays of the multiple propagation paths, and the one or more diameter Doppler information differences are determined based on Doppler information of the multiple propagation paths.

[0112] 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.

[0113] Based on the tenth aspect, in a possible implementation method, the channel parameters include the power, eigenvalue, or singular value of multiple propagation paths between the first communication device and the second communication device; 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, 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.

[0114] Based on the tenth aspect, in a possible implementation, the transceiver module is further 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.

[0115] 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.

[0116] Based on the tenth aspect, in a possible implementation, the RIS uses a unit weighting coefficient matrix for weighting; the transceiver module is further used to: receive switching information from the first communication device, the switching information is used to indicate switching the weighting coefficient matrix used by the RIS.

[0117] Based on the tenth aspect, in one possible implementation, the second communication device further includes a processing module configured to determine a data transmission parameter based on the first channel characteristic information and the second channel characteristic information; and the transceiver module is further configured to transmit data to the first communication device via the RIS based on the data transmission parameter. Optionally, the RIS employs a non-unit weighting coefficient matrix.

[0118] According to an eleventh aspect of the present application, a first communication device is provided, including:

[0119] a transceiver module, configured to receive a first reference signal from a second communication device via the RIS;

[0120] 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, where the channel characteristic is 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 an amount of power increase, eigenvalue increase, or singular value increase of the at least one propagation path, the first rank being greater than or equal to the rank indicated by the RI information, and the at least one propagation path being the propagation path between the first communication device and the second communication device;

[0121] 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, as well as the channel characteristics.

[0122] Based on the eleventh aspect, in a possible implementation, the RIS uses a weighting coefficient matrix for weighting.

[0123] Based on the eleventh aspect, in a possible implementation, the processing module is further used to: determine the first information and / or the second information based on channel parameters of a channel between the first communication device and the second communication device, where the channel parameters are obtained by measuring the first reference signal.

[0124] 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 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; when at least one path angle difference among the one or more path angle differences is less than or equal to the path angle threshold, or, 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 When the rank indicated by the enhanced RI information is less than or equal to the rank threshold, or when at least one of the one or more RADIUS information differences exists and is less than or equal to the RADIUS information 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 to indicate the improvement of the power, eigenvalue or singular value of at least one propagation path; or, when each RADIUS angle difference in one or more RADIUS angle differences is greater than the RADIUS angle 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 to indicate not to improve the power, eigenvalue or singular value of at least one propagation path.

[0125] 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 path correlation among 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.

[0126] Based on the eleventh aspect, in a possible implementation method, the channel parameters include at least one of the following: the 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 in 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 in 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 in one or more path singular value differences is greater than or equal to a path singular 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 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 the 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 determined, 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.

[0127] Based on the eleventh aspect, in a possible implementation manner, 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.

[0128] 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 falls within the interval [0, L path -K].

[0129] Based on the eleventh aspect, in one possible implementation, the 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 switching the weighting coefficient matrix used by the RIS.

[0130] Based on the eleventh aspect, in one possible implementation, the transceiver module is further configured to receive data from the second communication device via the RIS, where the data is sent according to data transmission parameters determined based on the first channel characteristic information. Optionally, the RIS employs a non-unit weighting coefficient matrix for weighting.

[0131] A twelfth aspect of the present application provides a second communication device, including:

[0132] A transceiver module is used to send a first reference signal to a first communication device via a RIS; receive first channel characteristic information from the first communication device, the first channel characteristic information including channel characteristics and status 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 status 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.

[0133] Based on the twelfth aspect, in a possible implementation, the RIS uses a weighting coefficient matrix for weighting.

[0134] 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.

[0135] 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 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 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 one or more path angle differences are determined based on the angles of the multiple propagation paths, and the 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 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.

[0136] Based on the twelfth aspect, in a possible implementation method, the channel parameters include at least one of the following: the angle, power, delay, 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 the path correlation 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, 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, power, delay, and Doppler information of the multiple propagation paths between the first communication device and the second communication device; or, when each path correlation among 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, power, delay, and Doppler information of the multiple propagation paths between the first communication device and the second communication device.

[0137] Based on the twelfth aspect, in a possible implementation method, the channel parameters include at least one of the following: the power, eigenvalue or singular value of multiple propagation paths between the first communication device and the second communication device; 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, 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 one or more path power differences are determined based on the power of multiple propagation paths, and the 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, 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; or, when each path power difference in the one or more path power differences is less than the path power difference threshold, or each path eigenvalue difference in the one or more path eigenvalue differences is less than the path eigenvalue difference threshold, or each path singular value difference in the 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, 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.

[0138] Based on the twelfth aspect, in a possible implementation manner, the second information includes the first rank, or includes the improvement amount of the first rank relative to the rank indicated by the RI information.

[0139] 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 falls within the interval [0, L path -K].

[0140] Based on the twelfth aspect, in one possible implementation method, the 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 the RIS.

[0141] Based on the twelfth aspect, in one possible implementation, the second communication device further includes a processing module configured to determine a data transmission parameter based on the first channel characteristic information; and the transceiver module is further configured to transmit data to the first communication device via the RIS based on the data transmission parameter. Optionally, the RIS employs a non-unit weighting coefficient matrix for weighting.

[0142] In a thirteenth aspect of the present application, a communication device is provided, comprising: a processor and a memory. The memory stores a computer program or computer instructions, and the processor is configured to call and execute the computer program or computer instructions stored in the memory, so that the processor implements any one of the implementations of any one of the first to sixth aspects.

[0143] Optionally, the communication device further includes a transceiver, and the processor is used to control the transceiver to transmit and receive signals.

[0144] In a fourteenth aspect, the present application provides a communication device, comprising a processor and an interface circuit, wherein the processor is configured to communicate with other devices via the interface circuit and execute the method described in any one of the first to sixth aspects. The processor comprises one or more processors.

[0145] In a fifteenth aspect, the present application provides a communication device, comprising a processor, connected to a memory, configured to call a program stored in the memory to execute the method described in any one of aspects 1 to 6. The memory may be located within or outside the communication device. The processor may include one or more processors.

[0146] In one implementation, the communication devices of the seventh to twelfth aspects mentioned above may be a chip or a chip system.

[0147] In a sixteenth aspect, the present application provides a computer program product comprising computer instructions, characterized in that when the computer program product is run on a computer, the computer is enabled to execute any one of the implementation methods of any one of the first to sixth aspects.

[0148] In the seventeenth aspect, the present application provides a computer-readable storage medium comprising computer instructions, which, when executed on a computer, enables the computer to execute any one of the implementation methods in any one of the first to sixth aspects.

[0149] In an eighteenth aspect, the present application provides a chip device comprising a processor for calling a computer program or computer instruction in a memory so that the processor executes any implementation of any one of the first to sixth aspects above.

[0150] Optionally, the processor is coupled to the memory via an interface.

[0151] 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 shown in the first aspect, and the second communication device is used to execute the method shown in the second aspect; or, the first communication device is used to execute the method shown in the third aspect, and the second communication device is used to execute the method shown in the fourth aspect; or, the first communication device is used to execute the method shown in the fifth aspect, and the second communication device is used to execute the method shown in the sixth aspect.

[0152] As can be seen from the above technical solution, a first communication device receives a first reference signal from a second communication device via the RIS. The first communication device then measures the first reference signal to obtain channel parameters of the channel between the first and second communication devices. The first communication device sends first information and / or second information to the second communication device. Therefore, in the technical solution of the present application, the first communication device determines the first information and / or second information based on the channel parameters and sends the first information and / or second information to the second communication device. The first information and / or second information are determined based on the channel parameters, the first information indicating whether to enhance the rank indicated by the RI information, and / or the first information indicating whether to increase the power, eigenvalue, or singular value of at least one propagation path. The second information indicates the first rank, and / or the second information indicates the amount of power increase, eigenvalue increase, or singular value increase 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 and second communication devices. This avoids the problem in some scenarios where enhancing the rank used for communication leads to a sharp decrease in system performance gain. It is beneficial to improve system capacity and thus ensure communication performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0153] FIG1A is a schematic diagram of a communication system according to an embodiment of the present application;

[0154] FIG1B is a schematic diagram of another embodiment of a communication system according to an embodiment of the present application;

[0155] FIG1C is a schematic diagram of another embodiment of the communication system according to the present application;

[0156] FIG1D is a schematic diagram of another embodiment of the communication system according to the present application;

[0157] FIG1E is a schematic diagram of another embodiment of the communication system according to the present application;

[0158] FIG1F is a schematic diagram of another embodiment of the communication system according to the present application;

[0159] FIG2 is a schematic diagram of an embodiment of an information sending method and an information receiving method according to an embodiment of the present application;

[0160] FIG3A is a schematic diagram of bits occupied by first information and bits occupied by second information according to an embodiment of the present application;

[0161] FIG3B is a schematic diagram of a scenario of the information sending method and the information receiving method according to an embodiment of the present application;

[0162] FIG4 is a schematic diagram of another embodiment of the information sending method and the information receiving method according to the embodiment of the present application;

[0163] FIG5 is a schematic diagram of another embodiment of the information sending method and the information receiving method according to the embodiment of the present application;

[0164] FIG6 is a schematic structural diagram of a communication device according to an embodiment of the present application;

[0165] FIG7 is another schematic structural diagram of a communication device according to an embodiment of the present application;

[0166] FIG8 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

[0167] FIG9 is a schematic structural diagram of a network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0168] Embodiments of the present application provide an information sending method, an information receiving method, and related devices for use by a first communication device to send first information and / or second information to a second communication device. This method avoids the problem in some scenarios where increasing the rank used for communication can lead to a sharp decrease in system performance gain. This method is beneficial for improving system capacity, thereby ensuring communication performance.

[0169] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0170] References to "one embodiment" or "some embodiments" in this application mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0171] 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 merely 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 items" or similar expressions refers to any combination of these items, including any combination of single items 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.

[0172] It is understood that in this application, "indication" can include direct indication, indirect indication, explicit indication, and 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.

[0173] 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) system, the universal mobile telecommunication system (UMTS), the mobile communication system after the 5G network (for example, the 6G mobile communication system), the vehicle network (V2X) communication system, the 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).

[0174] MIMO technology utilizes spatial resources to achieve array gain, multiplexing and diversity gain, and interference cancellation gain in space without increasing system bandwidth, thereby exponentially increasing the capacity and spectral efficiency of communication systems. Since its introduction, it has been favored by wireless communication researchers as one of the most typical and effective solutions to overcome non-ideal characteristics such as fading and inter-symbol interference caused by increasingly complex and diverse communication environments. However, as people's requirements for high-speed, high-reliability, and low-latency communications continue to increase, modern communication systems will continue to face the challenges of greater capacity, wider coverage, and lower latency. These requirements have also become key requirements for next-generation communication systems.

[0175] Throughout the complex evolution of wireless communication systems, high throughput and massive connectivity have always been core challenges and goals. To address these challenges, various technological innovations have emerged. However, these increasingly complex systems face challenges in implementation complexity, system energy consumption, and enhanced utilization and control of spatial channels.

[0176] To address these challenges, reconfigurable intelligent surfaces (RIS) have been widely researched as a technology with significant potential. Reconfigurable intelligent reflective surfaces can also be called intelligent reflecting surfaces (IRS) or large intelligent surfaces (LIS). For example, RIS-assisted networks, which control channel characteristics through RIS elements, are considered a key enabling technology for expanding the coverage of wireless communication networks.

[0177] RIS is a subwavelength artificial two-dimensional material typically composed of metal, dielectric, and adjustable elements, and can be equivalently characterized as a resistance-inductance-capacitance (RLC) resonant circuit. By adjusting the physical properties of the electromagnetic units (such as capacitive reactance, impedance, or inductive reactance), the radiation characteristics of the RIS can be modified, enabling unconventional physical phenomena such as irregular reflection, negative refraction, absorption, focusing, and polarization conversion, thereby dynamically controlling electromagnetic waves. RIS generates the desired electromagnetic behavior of each electromagnetic unit by controlling the bias voltage of a varactor diode, a positive-intrinsic-negative (PIN) photodiode switch, a microelectromechanical system (MEMS) switch, liquid crystal, or graphene.

[0178] Specifically, the RIS reflector panel is an intelligent panel comprised of multiple antenna elements, each of which is a low-cost passive reflector. Flexible configuration of the amplitude and phase of each antenna element can control wireless channel fading and form a desired directional beam. The RIS can be mounted on large surfaces (e.g., indoor walls or ceilings, outdoor buildings or signs) to reflect RF energy away from obstacles and create a virtual line-of-sight path between the communication source and target.

[0179] 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 obstruction or deep attenuation, can achieve the effect of extending coverage and filling 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 gain can be provided. RIS can be used between network devices and terminal devices to actively control the quality of the wireless channel between the network devices and the terminal devices. For example, link gain can be enhanced, the number of characteristic subchannels can be increased, etc. RIS improving the rank used for communication has also become a valuable scenario. The technical solution of this application mainly uses RIS to enhance the rank used for communication, thereby improving system performance gain.

[0180] The communication system to which the technical solution provided in this 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.

[0181] The following describes some possible communication systems applicable to the present application in conjunction with Figures 1A to 1F. The present application is also applicable to other communication systems, and the present application does not limit them specifically.

[0182] Figure 1A is a schematic diagram of a communication system according to an embodiment of the present application. Referring to Figure 1A , the communication system includes a base station 101, a terminal device 102, and a RIS 103. Base station 101 can transmit signals to terminal device 102 via RIS 103. The first communication device can be terminal device 102, and the second communication device can be base station 101. The technical solutions of the present application can be implemented between base station 101 and terminal device 102.

[0183] Figure 1B is a schematic diagram of another embodiment of a communication system according to an embodiment of the present application. Referring to Figure 1B , this communication system differs from the communication system shown in Figure 1A in that RIS 103 is deployed within base station 101. Signals transmitted by base station 101 pass through RIS 103 and are then reflected by scatterers to terminal device 102. It should be noted that the deployment of RIS 103 within base station 101 in Figure 1B is merely an example; in practice, other deployment configurations are possible. RIS 103 can be a reflective film attached to the antenna of base station 101, a specific embodiment not limited in this application.

[0184] Figure 1C is a schematic diagram of another embodiment of a communication system according to an embodiment of the present application. Referring to Figure 1C , this communication system differs from the communication system shown in Figure 1A in that RIS 103 is deployed in terminal device 102. The signal transmitted by base station 101 is reflected by scatterers and then reaches RIS 103, and then passes through RIS 103 to terminal device 102. It should be noted that the deployment of RIS 103 in terminal device 102 in Figure 1C is merely an example; in actual applications, other deployment configurations are possible. RIS 103 can be a reflective film attached to the antenna of terminal device 102, a specific embodiment not limited in this application.

[0185] Figure 1D is a schematic diagram of another embodiment of a communication system according to an embodiment of the present application. Referring to Figure 1D , the communication system includes a base station 101, a terminal device 102, and a RIS 103. Terminal device 102 can transmit signals to base station 101 via RIS 103. The first communication device can be base station 101, and the second communication device can be terminal device 102. The technical solutions of the present application can be implemented between base station 101 and terminal device 102.

[0186] Figure 1E is a schematic diagram of another embodiment of a communication system according to an embodiment of the present application. Referring to Figure 1E , this communication system differs from the communication system shown in Figure 1D in that RIS 103 is deployed within base station 101. The signal transmitted by terminal device 102 is reflected by a scatterer onto RIS 103, and then reflected by RIS 103 back to base station 101. It should be noted that the deployment of RIS 103 within base station 101 in Figure 1E is merely an example; in actual applications, other deployment configurations are possible. RIS 103 can be a reflective film attached to the antenna of base station 101, a specific embodiment not limited to this in this application.

[0187] Figure 1F is a schematic diagram of another embodiment of a communication system according to an embodiment of the present application. Referring to Figure 1F , this communication system differs from the communication system shown in Figure 1D in that RIS 103 is deployed in terminal device 102. Signals transmitted by terminal device 102 pass through RIS 103 before being reflected by scatterers and returned to base station 101. It should be noted that the deployment of RIS 103 in terminal device 102 in Figure 1F is merely an example; in practice, other deployment configurations are possible. RIS 103 can be a reflective film attached to the antenna of terminal device 102, a specific embodiment not limited in this application.

[0188] The following introduces the network equipment and terminal equipment involved in this application.

[0189] The terminal device may be a wireless terminal device capable of receiving network device scheduling information and instruction information. The terminal device may be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connection function, or other processing device connected to a wireless modem.

[0190] Terminal devices, also known as user equipment (UE), mobile stations (MS), mobile terminals (MT), and customer premises equipment (CPE), are devices that include wireless communication capabilities (providing voice / data connectivity to users). For example, they include handheld devices or vehicle-mounted devices with wireless connectivity. Currently, some examples of terminal devices include: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in the Internet of Vehicles, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. For example, wireless terminals in unmanned driving can be drones, helicopters, or airplanes. For example, wireless terminals in the Internet of Vehicles can be onboard equipment, complete vehicle equipment, onboard modules, vehicles, or ships. Wireless terminals in industrial control can be cameras, robots, or robotic arms. Wireless terminals in smart homes can be televisions, air conditioners, vacuum cleaners, speakers, or set-top boxes.

[0191] 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 specifically. It should be noted that in this application, when referring to a terminal device, it can refer to the terminal device itself, or it can refer to a chip, functional module or integrated circuit in the terminal device that performs the method provided in this application, and this application does not limit it specifically.

[0192] A network device can be a device in a wireless network. For example, a network device can be a device deployed in a radio access network that provides wireless communication capabilities for terminal devices. For example, a network device can be a radio access network (RAN) node that connects a terminal device to a wireless network. It can also be referred to as an access network device, RAN entity, access node, network node, or communication device.

[0193] 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 be an access network device in a communication system obtained by integrating two or more of the above communication systems.

[0194] 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 (for example, Home Evolved NodeB, 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, a Next Generation NodeB (gNB), TRP, or TP in an NR system; or one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G mobile communication system; or a network device can also be a network node that constitutes 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). The CU and DU can be configured separately or included in the same network element, such as a BBU. The RU can be included in a radio frequency device or radio frequency unit. For example, in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). Alternatively, the network device can also be a server, a wearable device, a vehicle, or an onboard device. For example, the access network device in V2X technology may be a road side unit (RSU).

[0195] It should be noted that in different systems, CU (or CU-CP and CU-UP), DU or RU may have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (ORAN) system, CU may also be referred to as an open centralized unit (O-CU) or an open CU, DU may also be referred to as an open distributed unit (O-DU), CU-CP may also be referred to as an open-centralized unit-control plane (O-CU-CP), CU-UP may also be referred to as an open-centralized unit-user plane (O-CU-UP), and RU may also be referred to as an open radio unit (O-RU). This application does not limit this. Any of the CU, CU-CP, CU-UP, DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0196] Optionally, for network elements in the ORAN system, each network element may implement the protocol layer functions shown in Table 1 below.

[0197] Table 1

[0198] It should be noted that, in the ORAN system, the network device in this application may be one or more network elements in Table 1 above.

[0199] The following describes the architecture of the CU and DU of an 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.

[0200] 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 Protocol (PDCP) layer and the protocol layers above it (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 (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 it (for example, the RLC layer, the MAC layer, and / or the PHY layer, etc.).

[0201] When a CU includes a CU-CP and a CU-UP, the CU-CP is used to implement the control plane functions of the CU, and the CU-UP is used to implement the user plane functions of the CU. For example, when the CU is configured to implement the functions of the PDCP layer, RRC layer, and SDAP layer, the CU-CP is used to implement the RRC layer functions and the control plane functions of the PDCP layer, and the CU-UP is used to implement the SDAP layer functions and the user plane functions of the PDCP layer.

[0202] The CU-CP can interact with network elements in the core network that implement control plane functions. The network elements in the core network that implement control plane functions can be access and mobility function network elements, such as the Access and Mobility Management 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, and switching of terminal devices.

[0203] The CU-UP can interact with network elements in the core network that implement user plane functions. Network elements in the core network that 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.

[0204] 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, according to the delay, the functions whose processing time needs to meet the smaller delay requirement are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU.

[0205] The DU and RU can work together to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of the DU and RU can be configured in various ways according to the design. For example, the DU is configured to implement the baseband function, and the RU is configured to implement the mid-RF function. For another example, the DU is configured to implement the high-layer functions in the PHY layer, and the RU is configured to implement the low-layer functions in the PHY layer or to implement the low-layer functions and the RF functions. The high-layer 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-layer functions in the physical layer may include another part of the functions of the physical layer, which is closer to the mid-RF side.

[0206] 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 this. 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 performs the method provided in this application, and this application does not limit this.

[0207] As shown in Figure 1A, RIS103 actively changes the channel to provide more gain-controllable channels. The channel from base station 101 to terminal device 102 is represented as H0, the channel from base station 101 to RIS103 is represented as H1, and the channel between RIS103 and terminal device 102 is represented as H2. The signal received by terminal device 102 can then 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 to 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 fails to improve, but instead drops sharply. It can be seen that the above technical solution cannot improve the system performance gain in some scenarios. Instead, the system performance gain drops sharply, resulting in a decrease in system capacity and communication performance.

[0208] This 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 based on 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 may lead 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 description of the embodiments below.

[0209] In this application, the name of RIS is not limited and may be used by other names. For example, RIS may also be called a configurable metasurface, metasurface, or supersurface, but this application does not specify the specific name. RIS is essentially a reflective surface that can be deployed on network devices or terminal devices.

[0210] The technical solution of this application is introduced below in conjunction with specific embodiments.

[0211] FIG2 is a schematic diagram of an embodiment of the information sending method and information receiving method of the present application. Referring to FIG2 , the method includes:

[0212] 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.

[0213] Optionally, the RIS uses a unit weighting matrix for weighting. This method is applied to a communication system including a RIS that uses a unit weighting matrix for weighting. For example, as shown in FIG1A , the first communication device is a base station 101, and the second communication device is a terminal device 102. Base station 101 transmits a first reference signal to terminal device 102 via RIS 103.

[0214] Optionally, the RIS can be deployed independently of the first and second communication devices, or on the first or second communication device, though this application does not limit this. For example, the RIS can be a reflective layer attached to the antenna of the first communication device, or 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, though this application does not limit this.

[0215] 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).

[0216] 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.

[0217] 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.

[0218] Optionally, the channel parameter includes 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.

[0219] Optionally, the angles of the multiple propagation paths include at least one of the following: the horizontal angle of arrival (Azimuth of Arrival, AOA), the horizontal angle of departure (Azimuth of Departure, AOD), the vertical angle of arrival (Zenith of Arrival, ZOA), or the vertical angle of departure (Zenith of Departure, ZOD) of the multiple propagation paths.

[0220] Optionally, the eigenvalues ​​of the multiple propagation paths are obtained by performing eigenvalue decomposition on a channel corresponding to each propagation path in 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 propagation path in the multiple propagation paths.

[0221] 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 an average Doppler value or a Doppler statistical value of each of the multiple propagation paths.

[0222] The multiple propagation paths may include line-of-sight (LOS) paths and non-line-of-sight (NLOS) paths between the first and second communication devices. The NLOS paths may include propagation paths between the first and second communication devices that pass through the RIS and / or propagation paths between the first and second communication devices that do not pass through the RIS. When the RIS is deployed on the first or second communication device, the multiple propagation paths all pass through the RIS.

[0223] Optionally, the first communication device measures the first reference signal according to a preset period. For example, as shown in FIG3B , the first communication device may measure the first reference signal according to a measurement period of the first reference signal.

[0224] 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.

[0225] The first information and / or the second information is determined according to a channel parameter.

[0226] The first information indicates whether to enhance the rank indicated by the RI information, and / or indicates whether to increase the power, eigenvalue, or singular value of at least one propagation path. The RI information is obtained by the first communication device through a traditional channel measurement process. The traditional channel measurement process can be understood as a process in which, without a RIS between the first and second communication devices, the first and second communication devices transmit reference signals and measure the reference signals 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 and second communication devices. The at least one propagation path includes at least one of the following: a LOS path between the first and second communication devices, and a NLOS path between the first and second communication devices. Optionally, the at least one propagation path includes a propagation path between the first and second communication devices that passes through the RIS. This utilizes the different reflection characteristics of the RIS for incident paths at different angles to increase spatial isolation. When the RIS is deployed on the first or second communication device, the at least one propagation path passes through the RIS.

[0227] 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 information about 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.

[0228] The following describes some possible ways to determine the first information and / or the second information in conjunction with the implementation of the channel parameters. This application is still applicable to other determination methods, and this application does not limit them specifically.

[0229] 1. Channel parameters include: angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0230] Optionally, after step 202 and before step 203, the first communications device determines one or more path angle differences based on the angles of the multiple propagation paths, or determines one or more path delay differences based on the time delays of the multiple propagation paths, or determines one or more path Doppler information differences based on 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 details about the angles of the multiple propagation paths, please refer to the aforementioned related description. For example, the multiple propagation paths include path 1, path 2, and path 3, and the multiple propagation path angles 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 about 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.

[0231] 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 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 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.

[0232] 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 path Doppler information differences is less than 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 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.

[0233] 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. Specifically, this application does not limit the form of the radial angle difference threshold. 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) bandwidth of a Discrete Fourier Transform (DFT) beam, or 0.5 times the bandwidth of a DFT beam, etc.

[0234] It should be noted that the method for determining the radial time 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 for details, please refer to the above-mentioned related introduction.

[0235] The above shows a possible implementation method for the first communication device to send the first information and / or the second information according to the one or more radial angle differences. In actual applications, there may be other implementation methods, which are not limited in this application. The following introduces two other possible implementation methods.

[0236] In one 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 in 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 in 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 in 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 radial angle differences greater than the radial angle difference threshold in the one or more radial angle differences is less than the radial angle difference number threshold, or, when the number of radial delay differences greater than the radial delay difference threshold in the one or more radial delay differences is less than the radial delay difference number threshold, or, when the number of radial Doppler information differences greater than the radial Doppler information difference threshold in the one or more radial Doppler information differences 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 in the one or more radial angle differences that is less than or equal to the radial angle difference threshold is greater than the radial angle difference number threshold, or, when the number of radial delay differences in the one or more radial delay differences that is less than or equal to the radial delay difference threshold is greater than the radial delay difference number threshold, or, when the number of radial Doppler information differences in the one or more radial Doppler information differences that is less than or equal to the radial Doppler information difference threshold 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 radial angle differences greater than the radial angle difference threshold in the one or more radial angle differences is less than or equal to the radial angle difference number threshold, or, when the number of radial delay differences greater than the radial delay difference threshold in the one or more radial delay differences is less than or equal to the radial delay difference number threshold, or, when the number of radial Doppler information differences greater than the radial Doppler information difference threshold in the one or more radial Doppler information differences 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.

[0237] 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 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. 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 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 determination methods corresponding to the first-level radial angle difference threshold and the second-level radial angle difference threshold are similar to the determination method of the aforementioned radial angle difference threshold. For details, please refer to the determination method of the aforementioned radial angle difference threshold, which will not be repeated here. The first level angle difference threshold and the second level 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.

[0238] 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 reasonably improving the rank used for communication and increasing system capacity.

[0239] 2. 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.

[0240] 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 the multiple propagation paths between the first communication device and the second communication device. The one or more path correlations can 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 the 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 Modulo, |W b | indicates that W b Find the modulus. W a Dot Product

[0241] 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, 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 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.

[0242] Alternatively, step 203 may specifically include: when at least one of the one or more path correlations is greater than a path correlation threshold, the first communication device sending first information and second information to the second communication device, or the first communication device sending the second information to the second communication device, wherein the first information indicates enhancing the rank indicated by the RI information and / or indicates increasing 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 or equal to the path correlation threshold, the first communication device sending the first information to the second communication device, wherein the first information indicates not enhancing the rank indicated by the RI information and / or indicates not increasing 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. For details, please refer to the method for determining the aforementioned path angle difference threshold and will not be repeated here. For example, the path correlation threshold falls within the interval [0.8, 1]. Generally, the path correlation threshold can be set higher with more transmitting and receiving antennas or higher receiver sensitivity.

[0243] The above illustrates one possible implementation of the first communication device sending the first information and / or the second information based on the one or more path correlations. In practical applications, other implementations are possible, and this application does not limit these. Two other possible implementations are described below.

[0244] In one 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 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 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-mentioned 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 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 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 is used 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. For details, please refer to the method for determining the aforementioned path angle difference threshold, which will not be repeated here.

[0245] In another possible implementation, a communication system is configured with multiple levels of path correlation thresholds, and a first communication device compares one or more path correlations with the multiple levels of path correlation thresholds to determine the first information and / or the second information. For example, the multiple levels of path correlation thresholds include 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 transmits the first information and the second information to the second communication device. Alternatively, the first communication device transmits the second information to the second communication device, wherein the first information indicates that the rank indicated by the RI information is enhanced and / or indicates that the power, eigenvalue, or singular value of at least one propagation path is increased. Alternatively, 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 transmits the first information to the second communication device, wherein the first information indicates that the rank indicated by the RI information is not enhanced and / or indicates that the power, eigenvalue, or singular value of at least one propagation path is not increased. The method for determining the multi-level diameter correlation threshold is 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.

[0246] 3. The channel parameter includes 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.

[0247] 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 multiple propagation paths, or the first communication device determines one or more path eigenvalue differences based on the eigenvalues ​​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.

[0248] 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 when 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 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 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 that the power, eigenvalue or singular value of at least one propagation path is increased; or, when each path power difference in one or more path power differences is less than the 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 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] Alternatively, the above-mentioned step 203 specifically includes: when at least one path power difference among one or more path power differences is greater than the path power difference threshold, or when at least one path characteristic value difference among one or more path eigenvalue differences is greater than the path eigenvalue difference threshold, or when at least one path singular value difference among 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, for indicating 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 is used to indicate that the power, eigenvalue or singular value of at least one propagation path is not increased.

[0250] 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.

[0251] The above illustrates one possible implementation method for the first communication device to transmit the first information and / or the second information based on one or more path power differences, one or more path eigenvalue differences, or one or more path singular value differences. In practical applications, other implementation methods are also possible and are not specifically limited in this application. Two other possible implementation methods are described below.

[0252] In one possible implementation, step 203 specifically includes: when the number of path power differences greater than or equal to the path power difference threshold among 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 among 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 among 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, for indicating 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 eigenvalue differences less than the path eigenvalue difference threshold in one or more path eigenvalue differences is less than the path eigenvalue 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 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, for indicating 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 all 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.

[0253] In another possible implementation, a multi-path power difference threshold, a multi-path characteristic value difference threshold, or a multi-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-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-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-path singular value difference threshold to determine the first information and / or the second information. For example, the multi-path power difference threshold includes a first-path power difference threshold and a second-path power difference threshold. When at least one of the one or more path power differences is greater than or equal to a first-level path power difference threshold, and at least two of the one or more path power differences are greater than or equal to a second-level path power 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 that the power of at least one propagation path is increased; 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 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 eigenvalue 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 method for determining the aforementioned path angle difference threshold, which will not be repeated here.

[0254] 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 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 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 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.

[0255] For another example, when at least one path singular value difference among 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 path singular value differences among the one or more path singular value differences are greater than or equal to the 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 to indicate the increase of the singular value of at least one propagation path; or, when each path singular value difference among the one or more path singular value differences is less than the first-level path singular value difference threshold, and each path singular value difference 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 to indicate not to increase the singular value of at least one propagation path.

[0256] Optionally, the second information includes the first rank, or includes the 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 is in the range [0, L path -K].

[0257] Optionally, the first information may occupy 1 bit, 2 bits, or 3 bits, which is not limited in this application. For example, as shown in FIG3A , 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 may be log2(L path -K).

[0258] 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 path The corresponding precoding matrix is ​​used to calculate the equivalent channel power and determine the first rank in the form of taking the maximum value.

[0259] 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 feedback 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 is used to indicate an increase in the power, eigenvalue, or singular value of at least one propagation path, the first communication device can stop measuring the first reference signal.

[0260] As can be seen, the first communications 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 communications device. This allows the first communications device to instruct the second communications device whether to enhance the rank indicated by the RI information based on the channel parameters. This allows for a reasonable increase in the rank used for communication, which is beneficial for improving system capacity.

[0261] Optionally, the embodiment shown in Figure 2 further includes step 204. Step 204 may be performed after step 203, or simultaneously with step 203, which is not specifically limited in this application.

[0262] 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.

[0263] The first information is used to indicate the weighting coefficient matrix used by the switching RIS.

[0264] When a first communication device transmits first information and second information, where the first information indicates the rank indicated by the enhanced RI information or indicates an increase in the power, eigenvalue, or singular value of at least one propagation path, or when the first communication device transmits the second information, the first communication device also transmits third information to the second communication device. Specifically, when the first communication device determines to enhance the rank indicated by the RI information or to increase the power, eigenvalue, or singular value of at least one propagation path, the first communication device may instruct the second communication device to switch the weighting coefficient matrix used in the RIS.

[0265] Optionally, the embodiment shown in FIG2 further includes steps 205 to 208. Steps 205 to 208 may be performed after step 203.

[0266] 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.

[0267] Optionally, the RIS uses a non-unit weighting coefficient matrix for weighting. Specifically, upon receiving 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 may determine a corresponding non-unit weighting coefficient matrix and instruct the RIS to use the non-unit weighting coefficient matrix, and the RIS may use the non-unit weighting coefficient matrix for weighting. For example, the second communication device may traverse each column in the DFT matrix as the diagonal elements of the weighting coefficient matrix.

[0268] 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.

[0269] Optionally, the second communication device transmits the second reference signal to the first communication device via the RIS at a preset period. Correspondingly, the first communication device receives the second reference signal from the second communication device via the RIS at a preset period. For example, as shown in FIG3B , the first communication device receives the second reference signal according to a second reference signal measurement period and measures the second reference signal.

[0270] 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.

[0271] In one 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 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.

[0272] In another possible implementation, the first information indicates that the rank indicated by the RI information is not enhanced, and / or that the power boost, eigenvalue boost, or singular value boost of at least one propagation path is not increased. The first communications device then measures the second reference signal based on the rank indicated by the RI information.

[0273] 207. The first communication device determines first channel characteristic information according to the first channel information.

[0274] Optionally, the first channel characteristic information includes: a first rank. If the first communications 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 communications 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.

[0275] 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.

[0276] 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.

[0277] Optionally, if the embodiment shown in FIG. 2 further includes step 204 , steps 205 to 208 may be performed after step 204 .

[0278] Optionally, the second communication device transmits a second reference signal to the first communication device via the RIS at a preset period. Each time the second communication device transmits the second reference signal, the RIS may use a different non-unit weighting coefficient matrix. The first communication device receives the second reference signal from the second communication device via the RIS at a preset period. The first communication device measures the second reference signal and feeds back multiple pieces of channel characteristic information obtained to the second communication device. Each piece of channel characteristic information corresponds to a non-unit weighting coefficient matrix. The second communication device may select appropriate channel characteristic information based on the multiple pieces of 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 beneficial for improving system performance gain and increasing system capacity.

[0279] Optionally, the embodiment shown in FIG2 further includes steps 209 and 210. Steps 209 and 210 may be performed after step 208.

[0280] 209. The second communication device determines a data transmission parameter according to the first channel characteristic information.

[0281] 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).

[0282] For example, the first channel characteristic information includes a first rank, CQI, and PMI. The second communication device determines a beam used to transmit data based on the first rank. The second communication device determines the number of data streams and MCS used to transmit data based on the first rank, CQI, and PMI.

[0283] 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.

[0284] Among them, RIS adopts a non-unit weighting coefficient matrix.

[0285] In an embodiment of the present application, a first communication device receives a first reference signal from a second communication device via a RIS. The first communication device then measures the first reference signal to obtain channel parameters of the channel between the first and second communication devices. The first communication device sends first information and / or second information to the second communication device. Therefore, in the technical solution of the present application, the first communication device determines the first information and / or second information based on the channel parameters and sends the first information and / or second information to the second communication device. The first information and / or second information are determined based on the channel parameters. The first information indicates whether to enhance the rank indicated by the RI information and / or indicates whether to increase the power, eigenvalue, or singular value of at least one propagation path. The second information indicates the first rank and / or indicates the amount of power increase, eigenvalue increase, or singular value increase for 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 and second communication devices. This avoids the problem in some scenarios where enhancing the rank used for communication can lead to a sharp decrease in system performance gain. This helps improve system capacity and thus ensures communication performance.

[0286] FIG4 is a schematic diagram of an embodiment of the information sending method and information receiving method of the present application. Referring to FIG4 , the method includes:

[0287] 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.

[0288] Step 401 is similar to step 201 in the embodiment shown in FIG. 2 . For details, please refer to the relevant introduction of step 201 in the embodiment shown in FIG. 2 , which will not be repeated here.

[0289] 402. The first communication device measures a first reference signal to obtain first channel characteristic information and second channel characteristic information.

[0290] Optionally, the first channel characteristic information includes a first rank, where 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. In other words, the second channel characteristic information is obtained by measuring the first reference signal based on the first rank.

[0291] 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 limit them specifically.

[0292] Optionally, the first communication device determines the first channel characteristic information including: the first communication device measures a first reference signal to obtain channel parameters 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 parameters.

[0293] The first channel characteristic information is introduced below in conjunction with some possible implementations of the channel parameters.

[0294] 1. Channel parameters include angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0295] Regarding the angles of the multiple propagation paths, please refer to the relevant introduction in the embodiment shown in FIG. 2 , which will not be repeated here.

[0296] 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 the Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0297] 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. There is at least one radial angle difference in the one or more radial angle differences that is less than or equal to the radial angle difference threshold. Or, there is at least one radial angle difference in the one or more radial angle differences that is less than the radial angle difference threshold. That is, when there is at least one radial angle difference in the one or more radial angle differences that 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 relevant introduction in the embodiment shown in Figure 2 above, which will not be repeated here.

[0298] 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. Alternatively, 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 the relevant introduction to the path delay difference threshold, please refer to the relevant introduction in the embodiment shown in Figure 2 above, which will not be repeated here.

[0299] Each of the one or more path Doppler information differences can be calculated based on 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. At least one of the one or more path Doppler information differences is less than or equal to a path Doppler information difference threshold. Alternatively, at least one of the one or more path Doppler information differences is less than a path Doppler information difference threshold. The first rank being greater than the rank indicated by the RI information indicates that the first communication device has determined the rank indicated by the enhanced RI information. For an introduction to the path Doppler information difference threshold, please refer to the introduction in the embodiment shown in FIG. 2 , which will not be repeated here.

[0300] 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 radial angle differences that are less than or equal to the radial angle difference threshold in the one or more radial angle differences is greater than or equal to the radial angle difference number threshold, or when there is at least one radial angle difference that is less than or equal to the first-level radial angle difference threshold in the one or more radial angle differences, and there are at least two radial angle differences that are less than or equal to the second-level radial angle difference threshold in the one or more radial angle differences, 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. Regarding 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 relevant introduction in the embodiment shown in Figure 2 above, which will not be repeated here. For more specific implementations, please refer to the relevant introduction in the embodiment shown in Figure 2 above, which will not be repeated here.

[0301] As can be seen, the first communication device determines the first rank based on the angles of multiple propagation paths and the path angle difference threshold, or based on the delays of multiple propagation paths and the path delay difference threshold, or based on the Doppler information of multiple propagation paths and the path Doppler information difference threshold. This allows for a reasonable improvement in the rank used for communication and increases system capacity.

[0302] 2. Channel parameters include angles, powers, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device.

[0303] Optionally, the first communication device determines one or more path correlations based on at least one of angle, power, delay, 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 angle, power, delay, and Doppler information of two or more propagation paths. For details on the angle, power, delay, or Doppler information of multiple propagation paths, please refer to the description of the embodiment shown in FIG. 2 .

[0304] 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 communications device has determined the rank indicated by the enhanced RI information. For an introduction to the path correlation threshold, please refer to the description of the embodiment shown in FIG. 2 , and will not be repeated here.

[0305] 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 when at least one path correlation in the one or more path correlations is greater than or equal to the first-level path correlation threshold, and at least two path correlations in the one or more path correlations are greater than or equal to the second-level path correlation 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. Regarding the path correlation number threshold, the first-level path correlation threshold, and the second-level path correlation threshold, please refer to the relevant introduction in the embodiment shown in Figure 2 above, which will not be repeated here.

[0306] 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 the path correlation threshold, thereby reasonably improving the rank used for communication and improving system capacity.

[0307] 3. The channel parameters include the power, eigenvalues, or singular values ​​of multiple propagation paths between the first communication device and the second communication device.

[0308] 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 determines one or more path eigenvalue differences based on the eigenvalues ​​of the multiple propagation paths, or determines one or more path singular value differences based on the singular values ​​of the multiple propagation paths. For information on the eigenvalues ​​or singular values ​​of the multiple propagation paths, please refer to the relevant description of the embodiment shown in FIG. 2 .

[0309] 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 rank is greater than the rank indicated by the RI information, indicating that the first communications device has determined the rank indicated by the enhanced RI information. For an introduction to the path power difference threshold, the path eigenvalue threshold, and the path singular value difference threshold, please refer to the introduction to the embodiment shown in FIG. 2 , which will not be repeated here.

[0310] The above illustrates 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, other implementation methods are also possible. For example, when the number of path power differences greater than or equal to the path power difference threshold among the one or more path power differences is greater than or equal to the path power difference number threshold, or when the number of path eigenvalue differences greater than or equal to the path eigenvalue difference threshold among the 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 among the 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 relevant introduction in the embodiment shown in FIG. 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 eigenvalue differences is greater than or equal to the first-level path eigenvalue difference threshold, and at least two of the one or more path eigenvalue differences are greater than or equal to the second-level path eigenvalue 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. Regarding the first-level power difference threshold, the second-level power difference threshold, the first-level eigenvalue difference threshold, the second-level eigenvalue difference threshold, the first-level singular value difference threshold and the second-level singular value difference threshold, please refer to the relevant introduction in the embodiment shown in Figure 2 above, and no further details will be given here.

[0311] Optionally, the value of the first rank is in 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.

[0312] 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 log2(L path -K).

[0313] Optionally, the first communication device determines the first rank according to the channel parameter. For specific examples, please refer to the relevant introduction in the embodiment shown in FIG2 .

[0314] In this embodiment, the first communications device determines the rank indicated by the enhanced RI information and the channel characteristic information during the same measurement process. That is, the first communications device determines the first rank and the second channel characteristic information during the channel characteristic measurement process. 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.

[0315] 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.

[0316] Optionally, the embodiment shown in FIG4 further includes step 404 .

[0317] 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.

[0318] 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.

[0319] It should be noted that there is no fixed execution order between step 404 and step 403. Step 403 can be executed first, and then step 404; or, step 404 can be executed first, and then step 403; or, step 403 and step 404 can be executed simultaneously depending on the situation. This application does not make any specific restrictions.

[0320] Optionally, the embodiment shown in FIG4 further includes step 405. Step 405 may be performed after step 403.

[0321] 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.

[0322] The switching information is used to indicate the switching of the weighting coefficient matrix used by the RIS.

[0323] Specifically, the first communication device determines the rank indicated by the enhanced RI information, and further sends switching information to the second communication device, thereby instructing the second communication device to switch the weighting coefficient matrix used by the RIS.

[0324] Optionally, if the embodiment shown in FIG4 further includes step 404, there is no fixed order for executing step 404 and step 405. Step 404 may be executed first, then step 405; or step 405 may be executed first, then step 404; or, depending on the circumstances, step 404 and step 405 may be executed simultaneously, which is not limited in this application.

[0325] Optionally, the embodiment shown in FIG4 further includes steps 406 and 407. Steps 406 and 407 may be performed after step 403.

[0326] 406. The second communication device determines data transmission parameters according to the first channel characteristic information and the second channel characteristic information.

[0327] Step 406 is similar to step 209 in the embodiment shown in FIG. 2 . For details, please refer to the relevant introduction of step 209 in the embodiment shown in FIG. 2 , which will not be repeated here.

[0328] 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.

[0329] Optionally, RIS uses a non-unit weighting coefficient matrix for weighting.

[0330] Optionally, after receiving 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 may determine a corresponding non-unit weighting coefficient matrix and instruct the RIS to use the non-unit weighting coefficient matrix, whereupon the RIS uses the non-unit weighting coefficient matrix for weighting. For an example of how the second communication device determines a non-unit weighting coefficient matrix, please refer to the description of the embodiment shown in FIG. 2 .

[0331] Optionally, if the embodiment shown in FIG. 4 includes steps 404 and 405 , step 407 may be performed after steps 404 and 405 .

[0332] In an embodiment of the present application, 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 first channel characteristic information and second channel characteristic information. The first channel characteristic information includes a first rank, which 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. 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 for improving system performance gain and system capacity.

[0333] FIG5 is a schematic diagram of another embodiment of the information sending method and information receiving method according to an embodiment of the present application. Referring to FIG5 , the method includes:

[0334] 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.

[0335] Step 501 is similar to step 401 in the embodiment shown in FIG. 4 . For details, please refer to the relevant introduction of step 401 in the embodiment shown in FIG. 4 , which will not be repeated here.

[0336] 502. The second communication device measures a first reference signal to obtain channel characteristics between the first communication device and the second communication device.

[0337] 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 a propagation path between the first communication device and the second communication device.

[0338] Optionally, the channel characteristic includes a first rank. If the first communications 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 communications 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.

[0339] Optionally, the channel characteristic further includes at least one of the following: CQI, PMI, or SNR. The CQI, PMI, and SNR are determined based on the first rank.

[0340] Optionally, the embodiment shown in FIG5 further includes step 502a.

[0341] 502a. The first communication device determines first information and / or second information based on channel parameters of a channel between the first communication device and the second communication device. The channel parameters are obtained by measuring a first reference signal.

[0342] The following describes some possible ways to determine the first information and / or the second information in conjunction with the implementation of the channel parameters. This application is still applicable to other determination methods, and this application does not limit them specifically.

[0343] 1. Channel parameters include: angles, delays, or Doppler information of multiple propagation paths between the first communication device and the second communication device. For details about the angles, delays, or Doppler information of the multiple propagation paths, please refer to the description of the embodiment shown in FIG. 2 , and will not be repeated here.

[0344] 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.

[0345] The process of the first communication device determining the first information and / or the second information based on the one or more radial angle differences, the one or more radial time delay differences or the one or more radial Doppler information differences is similar to the process of the first communication device sending the first information and / or the second information based on the one or more radial angle differences, the one or more radial time delay differences or the one or more radial Doppler information differences in the embodiment shown in Figure 2 above. For details, please refer to the relevant introduction in the embodiment shown in Figure 2 above.

[0346] As can be seen, 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 allows for a reasonable improvement in the rank used for communication and increases system capacity.

[0347] 2. 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.

[0348] 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.

[0349] 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.

[0350] The process of the first communication device determining the first information and / or the second information based on the one or more path correlations is similar to the process of the first communication device sending the first information and / or the second information based on the one or more path correlations in the embodiment shown in Figure 2 above. For details, please refer to the relevant introduction in the embodiment shown in Figure 2 above.

[0351] 3. The channel parameter includes 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.

[0352] 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 eigenvalue differences based on the eigenvalues ​​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 eigenvalue differences, or the one or more path singular value differences.

[0353] The process by which 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 is similar to the process by which the first communication device sends 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 in the embodiment shown in FIG2 . For details, please refer to the relevant introduction in the embodiment shown in FIG2 .

[0354] Optionally, the second information includes the first rank, or includes the 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 falls within the interval [0, L path -K].

[0355] Optionally, the first information may occupy 1 bit, 2 bits, or 3 bits, which is not limited in this application. For example, as shown in FIG3A , 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 may be log2(L path -K).

[0356] 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 according to the channel parameters. For specific examples, please refer to the relevant introduction of the embodiment shown in FIG2 .

[0357] 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.

[0358] 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.

[0359] 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.

[0360] As can be seen, 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 allows for a reasonable improvement in the rank used for communication, which is beneficial for improving system capacity.

[0361] Optionally, the embodiment shown in FIG5 further includes step 504 , which may be performed after step 502 .

[0362] 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.

[0363] The third information is used to indicate the weighting coefficient matrix used for switching the RIS.

[0364] When the first information indicates the rank indicated by the enhanced RI information and / or indicates an increase in the power, eigenvalue, or singular value of at least one propagation path, the first communications device transmits third information to the second communications device, thereby enabling the first communications device to instruct the second communications device to switch the weighting coefficient matrix used in the RIS.

[0365] It should be noted that there is no fixed order for executing step 503 and step 504. Step 503 may be executed first, then step 504; or step 504 may be executed first, then step 503; or, depending on the circumstances, step 503 and step 504 may be executed simultaneously, which is not limited in this application.

[0366] Optionally, the embodiment shown in FIG5 further includes steps 505 to 506. Steps 505 to 506 may be performed after step 503.

[0367] 505. The second communication device determines a data transmission parameter according to the first channel characteristic information.

[0368] Step 505 is similar to step 209 in the embodiment shown in FIG. 2 . For details, please refer to the relevant introduction of step 209 in the embodiment shown in FIG. 2 , which will not be repeated here.

[0369] 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.

[0370] Optionally, RIS uses a non-unit weighting coefficient matrix for weighting.

[0371] Optionally, after receiving the third information, the second communication device may control or instruct the RIS to switch the weighting coefficient matrix it uses. Alternatively, the RIS may use a preset non-unit weighting coefficient matrix for weighting. Alternatively, the second communication device may determine a corresponding non-unit weighting coefficient matrix and instruct the RIS to use the non-unit weighting coefficient matrix, whereupon the RIS uses the non-unit weighting coefficient matrix for weighting. For an example of how the second communication device determines a non-unit weighting coefficient matrix, please refer to the description of the embodiment shown in FIG. 2 .

[0372] Optionally, if the embodiment shown in FIG. 5 further includes step 504 , steps 505 to 506 may be performed after step 504 .

[0373] In an embodiment of the present application, a first communication device receives a first reference signal from a second communication device via a RIS. The first communication device then measures the first reference signal to obtain channel characteristics of the channel between the first and second communication devices. The channel characteristics are obtained by measuring the first reference signal based on first information and / or second information. The first information indicates whether to enhance the rank indicated by the RI information and / or indicates whether to increase the power, eigenvalue, or singular value of at least one propagation path. The second information indicates the first rank and / or indicates the amount of power increase, eigenvalue increase, or singular value increase 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 and second communication devices. The first communication device sends first channel characteristic information to the second communication device. The first channel characteristic information includes channel characteristics and status information, the status information indicates that the channel characteristics are obtained based on the first and / or second information; or the first channel characteristic information includes the first and / or second information, as well as the channel characteristics. This avoids the problem in some scenarios where enhancing the rank used for communication leads to a sharp decrease in system performance gain. It is beneficial to improve system capacity and thus ensure communication performance.

[0374] The communication device provided in the embodiments of the present application is described below.

[0375] Figure 6 is a schematic diagram of the structure of a communication device according to an embodiment of the present application. Referring to Figure 6, the communication device 600 can be used to execute the process executed by the first communication device in the embodiments shown in Figures 2, 4, and 5. For details, please refer to the relevant description of the above method embodiments.

[0376] The communication device 600 includes a transceiver module 601 and a processing module 602 .

[0377] The processing module 602 is used to perform data processing. The transceiver module 601 can implement corresponding communication functions. The transceiver module 601 can also be called a communication interface or a communication module.

[0378] 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 to enable the communication device to implement the aforementioned method embodiment.

[0379] The communication device 600 can be used to perform the actions performed by the first communication device in the above method embodiments. The communication device 600 can be the first communication device or a component configurable 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 embodiments. The transceiver module 601 is used to perform the reception-related operations on the first communication device side in the above method embodiments.

[0380] For example, the communication device 600 is used to perform the following scheme:

[0381] The transceiver module 601 is used to receive a first reference signal from the second communication device through the RIS; the processing module 602 is used to measure the first reference signal and 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 are 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 communication device 600 and the second communication device.

[0382] For another example, the communication device 600 is configured to execute the following solution:

[0383] 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, where the first channel characteristic information includes a first rank, which 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.

[0384] For another example, the communication device 600 is configured to execute the following solution:

[0385] The transceiver module 601 is used to receive a first reference signal from the 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.

[0386] For other implementations, please refer to the relevant introductions in the embodiments shown in Figures 2, 4 and 5 above, and no further details will be given here.

[0387] 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.

[0388] 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. The specific implementation depends on whether the above solution executed by the communication device 600 includes a sending action and a receiving action.

[0389] Optionally, the communication device 600 is configured to execute the actions executed by the first communication device in the embodiments shown in Figures 2, 4, and 5. For details, please refer to the relevant descriptions of the embodiments shown in Figures 2, 4, and 5, which will not be elaborated here.

[0390] 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.

[0391] The processing module 602 in the above embodiment can be implemented by at least one processor or processor-related circuits. The transceiver module 601 can be implemented by a transceiver or transceiver-related circuits. The transceiver module 601 can also be called a communication module or communication interface. The storage module can be implemented by at least one memory.

[0392] FIG7 is a schematic diagram of a structure of a communication device according to an embodiment of the present application. Referring to FIG7 , a communication device 700 can be used to execute the process executed by the second communication device in the embodiments shown in FIG2 , FIG4 and FIG5 . For details, please refer to the relevant description of the above method embodiments.

[0393] The communication device 700 includes a transceiver module 701. Optionally, the communication device 700 also includes a processing module 702.

[0394] The processing module 702 is used to process data. The transceiver module 701 can implement corresponding communication functions. The transceiver module 701 can also be called a communication interface or a communication module.

[0395] 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 to enable the communication device to implement the aforementioned method embodiment.

[0396] Communication device 700 can be used to perform the actions performed by the second communication device in the above method embodiments. Communication device 700 can be a second communication device or a component configurable in a second communication device. Processing module 702 is used to perform processing-related operations on the second communication device side in the above method embodiments. Transceiver module 701 is used to perform reception-related operations on the second communication device side in the above method embodiments.

[0397] For example, the communication device 700 is used to perform the following scheme:

[0398] The transceiver module 701 is configured to send a first reference signal to a first communication device via the RIS; and receive 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 of a 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 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 communication device 700.

[0399] For another example, the communication device 700 is used to execute the following solution:

[0400] The transceiver module 701 is used to send a first reference signal to the first communication device through the RIS, where 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, where the first channel characteristic information includes a first rank, which 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.

[0401] For another example, the communication device 700 is used to execute the following solution:

[0402] The transceiver module 701 is used to send a first reference signal to the first communication device via the RIS; receive first channel characteristic information from the first communication device, the first channel characteristic information including channel characteristics and status 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 status 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.

[0403] For other implementations, please refer to the relevant introductions in the embodiments shown in Figures 2, 4 and 5 above, and no further details will be given here.

[0404] 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.

[0405] 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. The specific implementation depends on whether the above solution executed by the communication device 700 includes a sending action and a receiving action.

[0406] Optionally, the communication device 700 is configured to execute the actions executed by the second communication device in the embodiments shown in Figures 2, 4, and 5. For details, please refer to the relevant descriptions of the embodiments shown in Figures 2, 4, and 5, which will not be elaborated here.

[0407] 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.

[0408] The processing module 702 in the above embodiment can be implemented by at least one processor or processor-related circuits. The transceiver module 701 can be implemented by a transceiver or transceiver-related circuits. The transceiver module 701 can also be called a communication module or communication interface. The storage module can be implemented by at least one memory.

[0409] The present application further 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 perform the operations performed by the first communication device or the second communication device in the above method embodiment.

[0410] When the communication device 800 is a terminal device, FIG8 shows a simplified schematic diagram of the terminal device structure. As shown in FIG8, the terminal device includes a processor, a memory, and a transceiver. The memory can store computer program code, and the transceiver includes a transmitter 831, a receiver 832, a radio frequency circuit (not shown), an antenna 833, and input / output devices (not shown).

[0411] The processor is mainly used to process communication protocols and communication data; control terminal devices, execute software programs and process software program data, etc.

[0412] Memory is mainly used to store software programs and data.

[0413] Radio frequency circuits are mainly used for conversion between baseband signals and radio frequency signals and for processing radio frequency signals.

[0414] Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.

[0415] The input and output device may include a touch screen, a display screen, or a keyboard. The input and output device is mainly used to receive data input by the user and output data to the user. It should be noted that some types of terminal devices may not have input and output devices.

[0416] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the RF circuit. The RF circuit then performs RF processing on the baseband signal and transmits the RF signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna. The RF circuit converts the RF signal into a baseband signal and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Figure 8 shows only one memory, processor, and transceiver. In actual terminal device products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be set independently of the processor or integrated with the processor, and this embodiment of the application does not limit this.

[0417] In the embodiment of the present application, the antenna and radio frequency circuit with transceiver functions can be regarded as the transceiver module of the terminal device, and the processor with processing function can be regarded as the processing module of the terminal device.

[0418] As shown in FIG8 , the communication device includes a processor 810, a memory 820, and a transceiver 830. The processor 810 may also be referred to as a processing unit, a processing board, a processing module, or a processing device. The transceiver 830 may also be referred to as a transceiver unit, a transceiver, or a transceiver device.

[0419] Optionally, the device used to implement the receiving function in transceiver 830 is considered a receiving module, and the device used to implement the transmitting function in transceiver 830 is considered a transmitting module. That is, transceiver 830 includes a receiver and a transmitter. A transceiver may also be sometimes referred to as a transceiver, a transceiver module, or a transceiver circuit. A receiver may also be sometimes referred to as a receiver, a receiving module, or a receiving circuit. A transmitter may also be sometimes referred to as a transmitter, a transmitting module, or a transmitting circuit.

[0420] The processor 810 is configured to execute the processing actions on the first communication device side or the second communication device side in the embodiments shown in Figures 2, 4, and 5. The transceiver 830 is configured to execute the transceiver actions on the first communication device side or the second communication device side in the embodiments shown in Figures 2, 4, and 5.

[0421] It should be understood that FIG8 is merely an example and not a limitation, and the terminal device including the transceiver module and the processing module may not rely on the structures shown in FIG5, FIG6 or FIG8.

[0422] When the communication device 800 is a chip, the chip includes a processor, a memory, and a transceiver. The transceiver may be an input / output circuit or a communication interface. The processor may be a processing module, a microprocessor, or an integrated circuit integrated on the chip. In the above method embodiments, the transmission operation of the first or second communication device may be understood as an output of the chip, and the reception operation of the first or second communication device may be understood as an input of the chip.

[0423] The present application also provides a communication device 900, which can be a network device or a chip. The communication device 900 can be used to perform the operations performed by the first communication device or the second communicati...

Claims

1. A method for sending information, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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.

Images