Communication method and communication device

Abstract

The invention provides a communication method and a communication device, in the method, a metasurface directly covers a first device, or near the first device is covered with a near field at an extremely small interval, and a plurality of propagation paths are separated by using the reflection characteristic of the metasurface, or the spatial isolation of the plurality of propagation paths is improved. The first device receives a first reference signal from the second device through the metasurface, and performs rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between the first device and the second device; sending first indication information to the second device, wherein the first indication information is used for indicating at least one of the multipath angle extension information or the multipath angle information; or a rank enhancement effective mode and a rank enhancement effective threshold are indicated. Therefore, the first device and the second device can interact with the rank enhancement effective interval, so that the transmission rank can be improved based on the response difference of the metasurface and the multipath angle information, and the system capacity is improved.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a communication method and a communication device. Background Art

[0002] A meta-surface is an intelligent panel including a plurality of antenna elements, and each antenna element is a passive reflection device; by flexibly configuring the amplitude and phase of each antenna element, it is possible to control the fading of the wireless channel and form a desired directional beam. Common application scenarios of the meta-surface are coverage enhancement and blind spot filling, and another application scenario under discussion is the rank enhancement scenario; for example, in the rank enhancement scenario, based on the meta-surface, more gain-controllable transmission paths can be provided, and a network (such as a radio access network (RAN)) or a base station can actively control the quality of the wireless channel between the base station and a user equipment (UE) (such as enhancing the link gain, increasing the number of eigen sub-channels, etc.). A possible rank enhancement scheme is to use the meta-surface as an intermediate node, presenting a forwarding function similar to that of a relay or an integrated access and backhaul (IAB); however, in the scenario where the meta-surface is used as an intermediate node, only when the direct channel quality is poor or the channel gains of the cascaded channel and the direct channel are comparable, the signal-to-noise ratio (SNR) performance gain of the user will not decrease sharply, thus limiting the gain scenario of the existing rank enhancement scheme. Summary of the Invention

[0003] This application provides a communication method and a communication device. Based on the meta-surface and the response difference to different multipath angles, the transmission rank can be improved, thereby improving the system capacity.

[0004] In a first aspect, the present application provides a communication method, which is executed by a first device. For example, the first device may be a network device (such as a base station), or a component of a network device (such as a processor, a chip, or a chip system, etc.), or a logic module that can implement all or part of the functions of a network device. For another example, the first device may be a terminal, or a communication module in the terminal, or a circuit or chip responsible for the communication function in the terminal (such as a modulation and demodulation (Modem) chip, also known as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip containing a Modem core). Optionally, when the first device is a network device, the second device is a terminal; when the first device is a terminal, the second device is a network device. Among them, the first device receives a first reference signal from the second device through a metasurface, and performs rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between the first device and the second device; the channel measurement information includes at least one of multipath angle spread information or multipath angle information. The first device sends first indication information to the second device, and the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread information or multipath angle information; the second information includes a rank enhancement effective mode and a rank enhancement effective threshold, and the rank enhancement effective mode and the rank enhancement effective threshold are related to at least one of multipath angle spread information or multipath angle information. Optionally, the first reference signal and the unit weighted coefficient matrix of the metasurface are used for the first device to perform rank enhancement channel measurement.

[0005] In this method, the first device includes a metasurface. For example, the metasurface can be a layer of surface material with one or more functions of reflection, transmission, and refraction. This surface material layer is attached to the antenna or antenna panel of the first device to achieve rank enhancement. For example, the metasurface has different reflection / refraction / transmission coefficients (or different responses) for different incident angles. Therefore, for two incident paths with relatively close angles, after passing through the metasurface, the angle between the two emerging paths may become very large, thereby improving the spatial isolation of these two paths and enhancing the channel transmission rank (possibly supporting more data streams). Compared with the separate deployment of the metasurface (for example, the metasurface acts as a relay between the first device and the second device), the metasurface directly covers the first device or covers it in the near field with a very small spacing near the first device, and uses the reflection characteristics of the metasurface to separate multiple propagation paths or improve the spatial isolation of these multiple propagation paths. Moreover, through rank-enhanced channel measurement, the first device or the second device can obtain information such as multipath angle spread information and multipath angle information, and can interact whether rank enhancement is performed and the rank-enhanced effective interval between the first device and the second device in an explicit or implicit manner (such as interacting at least one of the multipath angle spread information or the multipath angle information; or interacting information such as the rank-enhanced effective mode and the rank-enhanced effective threshold). Thus, based on the metasurface and the response differences for different multipath angles, the transmission rank can be improved, and the system capacity can be enhanced.

[0006] In a possible implementation, the first information is related to the first mapping relationship, the second mapping relationship, or the third mapping relationship. Among them, the first information includes at least one multipath angle spread information, and the first mapping relationship includes multiple rank-enhanced effective modes and multiple rank-enhanced effective thresholds corresponding to multiple multipath angle spread information. The first information includes at least one set of multipath angle spread information and multipath angle information, and the second mapping relationship includes multiple rank-enhanced effective modes and multiple rank-enhanced effective thresholds corresponding to multiple sets of multipath angle spread information and multipath angle information. The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmitting antenna dimension of the first reference signal, and the third mapping relationship includes multiple rank-enhanced effective modes and multiple rank-enhanced effective thresholds corresponding to multiple sets of multipath angle spread information, multipath angle information, and the transmitting antenna dimension of the first reference signal. Optionally, based on the above first mapping relationship, second mapping relationship, or third mapping relationship, it can be deduced that the rank-enhanced effective mode and the rank-enhanced effective threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0007] In this embodiment, the relationships among the rank enhancement activation mode, the rank enhancement activation threshold, the multipath angular spread information, the multipath angle information, and the transmit antenna dimension of the first reference signal are defined. For example, they can be predefined mapping relationships (such as the first mapping relationship, the second mapping relationship, and the third mapping relationship), and it is assumed that both the first device and the second device can predefine the above mapping relationships. Through the above mapping relationships, both the first device and the second device can determine the corresponding rank enhancement activation intervals, so that based on the metasurface and the response differences to different multipath angles, the transmission rank can be improved, and the system capacity can be enhanced.

[0008] In a possible embodiment, the first information is related to the first functional relationship, the second functional relationship, or the third functional relationship. Among them, the first information includes at least one piece of multipath angular spread information. The input parameters of the first functional relationship include the multipath angular spread information, and the output parameters include the rank enhancement activation mode and the rank enhancement activation threshold. The first information includes at least one set of multipath angular spread information and multipath angle information. The input parameters of the second functional relationship include the multipath angular spread information and the multipath angle information, and the output parameters include the rank enhancement activation mode and the rank enhancement activation threshold. The first information includes at least one set of multipath angular spread information, multipath angle information, and the transmit antenna dimension of the first reference signal. The input parameters of the third functional relationship include the multipath angular spread information, the multipath angle information, and the transmit antenna dimension of the first reference signal, and the output parameters include the rank enhancement activation mode and the rank enhancement activation threshold. Optionally, based on the above first functional relationship, second functional relationship, or third functional relationship, it can be deduced that the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angular spread information or the multipath angle information.

[0009] In this embodiment, the functional relationship satisfied by the multipath angular spread information, the multipath angle information, and the transmit antenna dimension is defined, and it is assumed that both the first device and the second device can predefine the above functional relationship. Based on the above functional relationship, both the first device and the second device can determine the corresponding rank enhancement activation intervals, so that based on the metasurface and the response differences to different multipath angles, the transmission rank can be improved, and the system capacity can be enhanced.

[0010] In a possible embodiment, the rank enhancement activation threshold includes a channel quality indicator index threshold or a modulation and coding scheme index threshold. Among them, a set of channel quality indicator index thresholds or modulation and coding scheme index thresholds corresponds to a set of signal-to-noise ratio thresholds, a set of signal-to-interference-plus-noise ratio thresholds, or a set of reference signal received power thresholds.

[0011] In this embodiment, when the rank enhancement activation threshold includes a channel quality indicator index threshold or a modulation and coding scheme index threshold, it means that the first device only needs to receive a channel quality indicator (CQI) according to the channel state information (CSI) feedback information within the rank enhancement measurement period, without newly defining and receiving a rank enhancement activation mode and a rank enhancement activation threshold.

[0012] In a possible embodiment, the rank enhancement activation mode is used to indicate whether the rank enhancement activation interval is an open interval or a closed interval; the rank enhancement activation mode is indicated by at least two bits.

[0013] In this embodiment, the rank enhancement activation mode indicates whether the rank enhancement activation interval is an open interval or a closed interval; for example, the open interval can be a one-sided open interval (such as [, Δ1] or [Δ2,]), or a two-sided open interval (such as [, Δ1] ∪ [Δ2,]); the closed interval can be expressed as [Δ1, Δ2]. If there are the above four cases, at least two bits can be used for indication.

[0014] In a possible embodiment, the rank enhancement activation threshold includes at least one of the maximum value or the minimum value of the rank enhancement activation interval; alternatively, the rank enhancement activation threshold includes a first value and a duration unit length, and the first value and the duration unit length are used to determine at least one of the maximum value or the minimum value of the rank enhancement activation interval.

[0015] In this embodiment, the rank enhancement activation threshold can only indicate the maximum value or the minimum value of the rank enhancement activation interval (for example, when the rank enhancement activation interval is an open interval, it can only indicate the maximum value or the minimum value), or it can indicate the maximum value and the minimum value of the rank enhancement activation interval (for example, when the rank enhancement activation interval is a closed interval, it is necessary to indicate the maximum value and the minimum value). Optionally, the rank enhancement activation interval can also be determined based on a first value (such as a fixed threshold) and a duration unit length; for example, by performing a first operation (such as addition, subtraction, multiplication, division, etc.) on the fixed threshold and the duration unit length, the maximum value and / or the minimum value of the rank enhancement activation interval can be obtained.

[0016] In a possible embodiment, the metasurface is weighted by a unit weighting coefficient matrix; the state of the unit weighting coefficient matrix of the metasurface is the default state of the metasurface. The first device performs rank enhancement channel measurement based on the first reference signal, specifically, based on the unit weighting coefficient matrix of the metasurface and the first reference signal, to determine the channel measurement information.

[0017] In this embodiment, when the meta-surface of the first device is used for rank-enhanced channel measurement, a unit weighting coefficient matrix is used for weighting. When the first device performs rank-enhanced channel measurement, the state of the unit weighting coefficient matrix is the meta-surface default state, so that the first device can perform rank-enhanced channel measurement based on the unit weighting coefficient matrix of the meta-surface and the first reference signal.

[0018] In a possible embodiment, the first device updates the weighting coefficient matrix of the meta-surface based on the first indication information.

[0019] In this embodiment, the first device can also update the weighting coefficient matrix of the meta-surface. For example, based on information such as multipath angle spread information or multipath angle information, the corresponding phase vector or matrix (the phase vector or matrix belongs to the weighting coefficient matrix of the meta-surface) is updated.

[0020] In a possible embodiment, the measurement period of the rank-enhanced channel measurement is determined based on the change state of the multipath angle; the measurement period of the rank-enhanced channel measurement is greater than or equal to the measurement period of the second reference signal; the signal type of the second reference signal is the same as or different from the signal type of the first reference signal.

[0021] In this embodiment, the rank-enhanced channel measurement can be independent of the channel state information (CSI) measurement process, and the measurement period of the rank-enhanced channel measurement is greater than or equal to (usually greater than) the CSI measurement period. Optionally, the measurement period of the rank-enhanced channel measurement includes the entire period of the rank-enhanced channel measurement and feedback. Similarly, the CSI measurement period includes the entire period of CSI measurement and feedback.

[0022] In a second aspect, the present application provides a communication method, which is executed by a first device. For example, the first device may be a network device (such as a base station), or a component of a network device (such as a processor, a chip, or a chip system, etc.), and may also be a logic module capable of implementing all or part of the functions of a network device. For another example, the first device may be a terminal, or a communication module in the terminal, or a circuit or chip responsible for the communication function in the terminal (such as a Modem chip, also known as a baseband chip, or an SoC or SIP chip containing a Modem core). Optionally, when the first device is a network device, the second device is a terminal; when the first device is a terminal, the second device is a network device. Among them, the first device sends a first reference signal and a unit weight coefficient matrix of the metasurface to the second device through the metasurface; the first reference signal and the unit weight coefficient matrix of the metasurface are used for the second device to perform rank enhancement channel measurement. The first device receives first indication information from the second device, and the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread information or multipath angle information; at least one of the multipath angle spread information or the multipath angle information is obtained by the second device based on the first reference signal for rank enhancement channel measurement; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0023] In this method, the first device includes a metasurface. Compared with the separate deployment of the metasurface (for example, the metasurface acts as a relay between the first device and the second device), the metasurface directly covers the first device, or covers the vicinity of the first device in the near field with a very small spacing, and uses the reflection characteristics of the metasurface to separate multiple propagation paths, or improve the spatial isolation of the multiple propagation paths. Moreover, the first device and the second device interact in an explicit or implicit manner (such as interacting with at least one of the multipath angle spread information or the multipath angle information; or interacting with information such as the rank enhancement activation mode and the rank enhancement activation threshold) about whether to perform rank enhancement and the rank enhancement activation interval, so that based on the metasurface and the response differences to different multipath angles, the transmission rank can be improved, and the system capacity can be enhanced.

[0024] In a possible implementation, the first information is related to the first mapping relationship, the second mapping relationship, or the third mapping relationship. Among them, the first information includes at least one multipath angle spread information, and the first mapping relationship includes multiple rank enhancement effective modes and multiple rank enhancement effective thresholds corresponding to the multiple multipath angle spread information. The first information includes at least one set of multipath angle spread information and multipath angle information, and the second mapping relationship includes multiple rank enhancement effective modes and multiple rank enhancement effective thresholds corresponding to the multiple sets of multipath angle spread information and multipath angle information. The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal, and the third mapping relationship includes multiple rank enhancement effective modes and multiple rank enhancement effective thresholds corresponding to the multiple sets of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal. Optionally, based on the above first mapping relationship, second mapping relationship, or third mapping relationship, it can be deduced that the rank enhancement effective mode and the rank enhancement effective threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0025] In a possible implementation, when the first information includes at least one of the multipath angle spread information or the multipath angle information, the first device obtains the rank enhancement effective mode and the rank enhancement effective threshold corresponding to the first information from at least one of the preset first mapping relationship, second mapping relationship, or third mapping relationship based on at least one of the multipath angle spread information or the multipath angle information.

[0026] In the above implementation, if the first indication information indicates at least one of the multipath angle spread information or the multipath angle information, the first device may determine the rank enhancement effective mode and the rank enhancement effective threshold corresponding to the multipath angle spread information and / or the multipath angle information based on the preset mapping relationship (the first mapping relationship, the second mapping relationship, or the third mapping relationship), for example, by looking up a table.

[0027] In a possible implementation, the first information is related to the first function relationship, the second function relationship, or the third function relationship. Among them, the first information includes at least one multipath angle spread information. The input parameter of the first function relationship includes the multipath angle spread information, and the output parameter includes the rank enhancement effective mode and the rank enhancement effective threshold. The first information includes at least one set of multipath angle spread information and multipath angle information. The input parameter of the second function relationship includes the multipath angle spread information and the multipath angle information, and the output parameter includes the rank enhancement effective mode and the rank enhancement effective threshold. The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmission antenna dimension of the first reference signal. The input parameter of the third function relationship includes the multipath angle spread information, the multipath angle information, and the transmission antenna dimension of the first reference signal, and the output parameter includes the rank enhancement effective mode and the rank enhancement effective threshold. Optionally, based on the above first function relationship, second function relationship, or third function relationship, it can be deduced that the rank enhancement effective mode and the rank enhancement effective threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0028] In a possible implementation, when the first information includes at least one of the multipath angle spread information or the multipath angle information, the first device uses at least one of the multipath angle spread information or the multipath angle information as the input parameter of the function, and combines at least one of the preset first function relationship, second function relationship, or third function relationship to obtain the output parameter of the function, including the rank enhancement effective mode and the rank enhancement effective threshold corresponding to the first information.

[0029] In the above implementation, if the first indication information indicates at least one of the multipath angle spread information or the multipath angle information, the first device can determine the rank enhancement effective mode and the rank enhancement effective threshold corresponding to the multipath angle spread information and / or the multipath angle information based on the preset function relationship (the first function relationship, the second function relationship, or the third function relationship).

[0030] Optionally, other possible implementations in the second aspect can refer to the descriptions corresponding to other possible implementations in the first aspect. For example, the descriptions of the first information and the second information, etc., will not be elaborated here. Optionally, the effects that can be achieved by other possible implementations in the second aspect can also refer to the descriptions of the effects that can be achieved by other possible implementations in the first aspect, which will not be elaborated here.

[0031] In a third aspect, the present application provides a communication method, which is executed by a second device. For example, the second device may be a network device (such as a base station), or a component of a network device (such as a processor, a chip, or a chip system, etc.), or a logic module capable of implementing all or part of the functions of a network device. For another example, the second device may be a terminal, or a communication module in the terminal, or a circuit or chip responsible for communication functions in the terminal (such as a Modem chip, also known as a baseband chip, or an SoC or SIP chip containing a Modem core). Optionally, when the second device is a network device, the first device is a terminal; when the second device is a terminal, the first device is a network device. Wherein, the second device sends a first reference signal to the first device. The second device receives first indication information from the first device, and the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread information or multipath angle information; at least one of the multipath angle spread information or the multipath angle information is obtained by the first device through rank enhancement channel measurement based on the first reference signal; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information. Optionally, the first device includes a metasurface, and at least one of the multipath angle spread information or the multipath angle information is obtained by the first device through rank enhancement channel measurement based on the first reference signal and the unit weighting coefficient matrix of the metasurface.

[0032] In this method, the second device is the transmitter of the first reference signal; the first device is the receiver of the first reference signal, and the first device includes a metasurface and can perform rank enhancement channel measurement based on the first reference signal, so that it can feedback the rank enhancement activation interval to the second device, which is beneficial to the first device and the second device to achieve the improvement of the transmission rank and enhance the system capacity.

[0033] In a possible implementation, the first information is related to the first mapping relationship, the second mapping relationship, or the third mapping relationship. Among them, the first information includes at least one multipath angle spread information, and the first mapping relationship includes multiple rank enhancement activation modes and multiple rank enhancement activation thresholds corresponding to the multiple multipath angle spread information. The first information includes at least one set of multipath angle spread information and multipath angle information, and the second mapping relationship includes multiple rank enhancement activation modes and multiple rank enhancement activation thresholds corresponding to the multiple sets of multipath angle spread information and multipath angle information. The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmission antenna dimension of the first reference signal, and the third mapping relationship includes multiple rank enhancement activation modes and multiple rank enhancement activation thresholds corresponding to the multiple sets of multipath angle spread information, multipath angle information, and the transmission antenna dimension of the first reference signal. Optionally, based on the above first mapping relationship, second mapping relationship, or third mapping relationship, it can be deduced that the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0034] In this implementation, the relationships among the rank enhancement activation mode, the rank enhancement activation threshold, the multipath angle spread information, the multipath angle information, and the transmission antenna dimension of the first reference signal are defined. For example, they can be predefined mapping relationships (such as the first mapping relationship, the second mapping relationship, and the third mapping relationship), and it is assumed that both the first device and the second device can predefine the above mapping relationships. Through the above mapping relationships, both the first device and the second device can determine the corresponding rank enhancement activation interval, so as to achieve the improvement of the transmission rank based on the metasurface and the response difference to different multipath angles, and improve the system capacity.

[0035] In a possible implementation, when the first information includes at least one of the multipath angle spread information or the multipath angle information, the second device obtains the rank enhancement activation mode and the rank enhancement activation threshold corresponding to the first information from at least one of the preset first mapping relationship, second mapping relationship, or third mapping relationship based on at least one of the multipath angle spread information or the multipath angle information.

[0036] In this implementation, if the first indication information indicates at least one of the multipath angle spread information or the multipath angle information, the second device can determine the rank enhancement activation mode and the rank enhancement activation threshold corresponding to the multipath angle spread information and / or the multipath angle information based on the preset mapping relationship (the first mapping relationship, the second mapping relationship, or the third mapping relationship), for example, by looking up a table.

[0037] In a possible implementation, the first information is related to the first function relationship, the second function relationship, or the third function relationship. Among them, the first information includes at least one multipath angle spread information. The input parameter of the first function relationship includes the multipath angle spread information, and the output parameters include the rank enhancement effective mode and the rank enhancement effective threshold. The first information includes at least one set of multipath angle spread information and multipath angle information. The input parameters of the second function relationship include the multipath angle spread information and the multipath angle information, and the output parameters include the rank enhancement effective mode and the rank enhancement effective threshold. The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmission antenna dimension of the first reference signal. The input parameters of the third function relationship include the multipath angle spread information, the multipath angle information, and the transmission antenna dimension of the first reference signal, and the output parameters include the rank enhancement effective mode and the rank enhancement effective threshold. Optionally, based on the above first function relationship, second function relationship, or third function relationship, it can be deduced that the rank enhancement effective mode and the rank enhancement effective threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0038] In this implementation, the function relationships satisfied by the multipath angle spread information, the multipath angle information, and the transmission antenna dimension are defined, and it is assumed that both the first device and the second device can pre-define the above function relationships. Based on the above function relationships, both the first device and the second device can determine the corresponding rank enhancement effective intervals, so that the transmission rank can be improved based on the metasurface and based on the response differences to different multipath angles, and the system capacity can be improved.

[0039] In a possible implementation, when the first information includes at least one of the multipath angle spread information or the multipath angle information, the second device uses at least one of the multipath angle spread information or the multipath angle information as the input parameter of the function, and combines at least one of the preset first function relationship, second function relationship, or third function relationship to obtain the output parameters of the function including the rank enhancement effective mode and the rank enhancement effective threshold corresponding to the first information.

[0040] In this implementation, if the first indication information indicates at least one of the multipath angle spread information or the multipath angle information, the second device can determine the rank enhancement effective mode and the rank enhancement effective threshold corresponding to the multipath angle spread information and / or the multipath angle information based on the preset function relationship (the first function relationship, the second function relationship, or the third function relationship).

[0041] In a possible implementation, the rank enhancement effective threshold includes a channel quality indication index threshold or a modulation and coding scheme index threshold. Among them, a set of channel quality indication index thresholds or modulation and coding scheme index thresholds corresponds to a set of signal-to-noise ratio thresholds, a set of signal-to-interference-plus-noise ratio thresholds, or a set of reference signal received power thresholds.

[0042] In this embodiment, when the rank enhancement activation threshold includes a channel quality indication index threshold or a modulation and coding scheme index threshold, it means that the first device only needs to receive CQI according to the CSI feedback information within the rank enhancement measurement period, without newly defining and receiving a rank enhancement activation mode and a rank enhancement activation threshold.

[0043] In a possible embodiment, the rank enhancement activation mode is used to indicate whether the rank enhancement activation interval is an open interval or a closed interval; the rank enhancement activation mode is indicated by at least two bits.

[0044] In this embodiment, the rank enhancement activation mode indicates whether the rank enhancement activation interval is an open interval or a closed interval; for example, the open interval can be a one-sided open interval (such as [,Δ1] or [Δ2,]), or a two-sided open interval (such as [,Δ1] ∪ [Δ2,]); the closed interval can be expressed as [Δ1,Δ2]. If there are the above four cases, at least two bits can be used for indication.

[0045] In a possible embodiment, the rank enhancement activation threshold includes at least one of the maximum value or the minimum value of the rank enhancement activation interval; alternatively, the rank enhancement activation threshold includes a first value and a duration unit length, and the first value and the duration unit length are used to determine at least one of the maximum value or the minimum value of the rank enhancement activation interval.

[0046] In this embodiment, the rank enhancement activation threshold can only indicate the maximum value or the minimum value of the rank enhancement activation interval (for example, when the rank enhancement activation interval is an open interval, only the maximum value or the minimum value can be indicated), or can indicate the maximum value and the minimum value of the rank enhancement activation interval (for example, when the rank enhancement activation interval is a closed interval, the maximum value and the minimum value need to be indicated). Optionally, the rank enhancement activation interval can also be determined based on a first value (such as a fixed threshold) and a duration unit length; for example, performing a first operation (such as addition, subtraction, multiplication, division, etc.) on the fixed threshold and the duration unit length can obtain the maximum value and / or the minimum value of the rank enhancement activation interval.

[0047] In a possible embodiment, the measurement period of the rank enhancement channel measurement is determined based on the change state of the multipath angle; the measurement period of the rank enhancement channel measurement is greater than or equal to the measurement period of the second reference signal; the signal type of the second reference signal is the same as or different from the signal type of the first reference signal.

[0048] In this embodiment, the rank enhancement channel measurement can be independent of the channel state information CSI measurement process, and the measurement period of the rank enhancement channel measurement is greater than or equal to (usually greater than) the channel state information CSI measurement period. Optionally, the measurement period of the rank enhancement channel measurement includes the entire period of the rank enhancement channel measurement and feedback. Similarly, the CSI measurement period includes the entire period of CSI measurement and feedback.

[0049] Fourthly, the present application provides a communication method, which is executed by a second device. For example, the second device may be a network device (such as a base station), or a component of a network device (such as a processor, a chip, or a chip system, etc.), and may also be a logic module capable of implementing all or part of the functions of a network device. Again, for example, the second device may be a terminal, or a communication module in the terminal, or a circuit or chip responsible for the communication function in the terminal (such as a Modem chip, also known as a baseband chip, or a SoC or SIP chip including a Modem core). Optionally, when the second device is a network device, the first device is a terminal; when the second device is a terminal, the first device is a network device. Among them, the second device receives a first reference signal and a unit weight coefficient matrix of a metasurface from the first device, and performs rank enhancement channel measurement based on the first reference signal and the unit weight coefficient matrix of the metasurface to obtain channel measurement information between the first device and the second device, and the channel measurement information includes at least one of multipath angle spread information or multipath angle information. The second device sends a first indication information to the first device, and the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread information or multipath angle information; the second information includes a rank enhancement effective mode and a rank enhancement effective threshold, and the rank enhancement effective mode and the rank enhancement effective threshold are related to at least one of multipath angle spread information or multipath angle information.

[0050] In this method, the second device is the receiving end of the first reference signal; the first device is the transmitting end of the first reference signal, and the first device includes a metasurface. The second device receives the first reference signal and the unit weight coefficient matrix of the metasurface, and can perform rank enhancement channel measurement based on the first reference signal, so as to feedback the rank enhancement effective interval to the first device, which is beneficial to the first device and the second device to achieve the improvement of the transmission rank and improve the system capacity.

[0051] Optionally, other possible implementation manners in the fourth aspect may refer to the corresponding descriptions of other possible implementation manners in the third aspect. For example, the descriptions of the first information and the second information, etc., will not be elaborated here. Optionally, the effects that can be achieved by other possible implementation manners in the fourth aspect may also refer to the descriptions of the effects that can be achieved by other possible implementation manners in the third aspect, which will not be elaborated here.

[0052] In a fifth aspect, the present application provides a communication device. The communication device may be a network device or a terminal, or a component of a network device or a terminal (such as a processor, a chip, or a chip system, etc.), or a device that can be used in combination with a network device or a terminal. In a possible implementation manner, the communication device has the functions of the first aspect described above. For example, the communication device includes modules, units, or means corresponding to the operations involved in the first aspect. The modules, units, or means may be specifically implemented by software, or by hardware, or by a combination of software and hardware.

[0053] In a possible implementation manner, the communication device includes a communication unit and a processing unit. The communication unit is configured to receive a first reference signal from a second device through a metasurface. The processing unit is configured to perform rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between a first device and the second device; the channel measurement information includes at least one of multipath angle spread information or multipath angle information. The communication unit is further configured to send first indication information to the second device, where the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread information or multipath angle information; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of multipath angle spread information or multipath angle information.

[0054] Optionally, other possible implementation manners in the fifth aspect may refer to the corresponding descriptions of other possible implementation manners in the first aspect, which will not be elaborated here.

[0055] In a sixth aspect, the present application provides a communication device. The communication device may be a network device or a terminal, or a component of a network device or a terminal (such as a processor, a chip, or a chip system, etc.), or a device that can be used in combination with a network device or a terminal. In a possible implementation manner, the communication device has the functions of the second aspect described above. For example, the communication device includes modules, units, or means corresponding to the operations involved in the second aspect. The modules, units, or means may be specifically implemented by software, or by hardware, or by a combination of software and hardware.

[0056] In a possible implementation, the communication device includes a communication unit and a processing unit. The communication unit is configured to send a first reference signal to a second device via a metasurface. The communication unit is further configured to receive first indication information from the second device, where the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread information or multipath angle information; at least one of the multipath angle spread information or the multipath angle information is obtained by the second device through rank enhancement channel measurement based on the first reference signal; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0057] Optionally, other possible implementations in the sixth aspect may refer to the corresponding descriptions of other possible implementations in the second aspect, which will not be elaborated here.

[0058] In a seventh aspect, the present application provides a communication device. The communication device may be a network device or a terminal, or a component of a network device or a terminal (such as a processor, a chip, or a chip system, etc.), or a device capable of being used in combination with a network device or a terminal. In a possible implementation, the communication device is capable of implementing the functions of the third aspect above. For example, the communication device includes modules, units, or means corresponding to the operations involved in the third aspect above. The modules, units, or means may be implemented specifically by software, or by hardware, or by a combination of software and hardware.

[0059] In a possible implementation, the communication device includes a communication unit and a processing unit. The communication unit is configured to send a first reference signal to a first device. The communication unit is further configured to receive first indication information from the first device, where the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread information or multipath angle information; at least one of the multipath angle spread information or the multipath angle information is obtained by the first device through rank enhancement channel measurement based on the first reference signal; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0060] Optionally, other possible implementations in the seventh aspect may refer to the corresponding descriptions of other possible implementations in the third aspect, which will not be elaborated here.

[0061] In an eighth aspect, the present application provides a communication device. The communication device may be a network device or a terminal, or a component of a network device or a terminal (such as a processor, a chip, or a chip system, etc.), or a device that can be used in combination with a network device or a terminal. In a possible implementation manner, the communication device has the functions implemented in the above fourth aspect. For example, the communication device includes a module, a unit, or a means corresponding to the operations involved in the above fourth aspect. The module, the unit, or the means may be specifically implemented by software, or by hardware, or by a combination of software and hardware.

[0062] In a possible implementation manner, the communication device includes a communication unit and a processing unit. The communication unit is configured to receive a first reference signal from a first device. The processing unit is configured to perform rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between the first device and a second device, where the channel measurement information includes at least one of multipath angular spread information or multipath angle information. The communication unit is further configured to send first indication information to the first device, where the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angular spread information or multipath angle information; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of multipath angular spread information or multipath angle information.

[0063] Optionally, other possible implementation manners in the eighth aspect may refer to the corresponding descriptions of other possible implementation manners in the fourth aspect, which will not be elaborated here.

[0064] In a ninth aspect, the present application provides a communication device, which includes a memory and one or more processors. The memory is used to store part or all of the necessary computer programs or instructions for implementing the functions involved in at least one of the above first aspect, second aspect, third aspect, or fourth aspect. The one or more processors can execute the computer programs or instructions, and when the computer programs or instructions are executed, the communication device is caused to implement at least one of the following: the method in the first aspect and any possible implementation manner in the first aspect, the method in the second aspect and any possible implementation manner in the second aspect, the method in the third aspect and any possible implementation manner in the third aspect, or the method in the fourth aspect and any possible implementation manner in the fourth aspect.

[0065] In a possible design, the communication device may further include an interface circuit, where the processor is configured to communicate with other devices or components through the interface circuit.

[0066] In a possible design, the communication device may further include a memory.

[0067] In a possible design, the communication device may be a terminal, or a communication module in the terminal, or a chip responsible for the communication function in the terminal, such as a Modem chip, or an SoC or SIP chip including a Modem module.

[0068] In a tenth aspect, the present application provides a communication device, including: a processor and an interface circuit. The interface circuit is configured to receive signals from other communication devices and transmit them to the processor, or send signals from the processor to other communication devices. The processor is configured to implement at least one of the following through a logic circuit or by executing code instructions: the methods in the first aspect and any possible implementation manner of the first aspect, the methods in the second aspect and any possible implementation manner of the second aspect, the methods in the third aspect and any possible implementation manner of the third aspect, or the methods in the fourth aspect and any possible implementation manner of the fourth aspect.

[0069] In an eleventh aspect, the present application provides a communication system, which includes at least one of the devices or apparatuses in the fifth aspect to the tenth aspect above, such that the at least one device or apparatus executes at least one of the following: the methods in the first aspect and any possible implementation manner of the first aspect, the methods in the second aspect and any possible implementation manner of the second aspect, the methods in the third aspect and any possible implementation manner of the third aspect, or the methods in the fourth aspect and any possible implementation manner of the fourth aspect.

[0070] In a twelfth aspect, the present application provides a computer-readable storage medium, in which a computer program or computer-readable instructions are stored. When the computer program or computer-readable instructions run on a computer, the computer is caused to execute at least one of the following: the methods in the first aspect and any possible implementation manner of the first aspect, the methods in the second aspect and any possible implementation manner of the second aspect, the methods in the third aspect and any possible implementation manner of the third aspect, or the methods in the fourth aspect and any possible implementation manner of the fourth aspect.

[0071] In a thirteenth aspect, the present application provides a computer program product. When a computer reads and executes the computer program product, the computer is caused to execute at least one of the following: the methods in the first aspect and any possible implementation manner of the first aspect, the methods in the second aspect and any possible implementation manner of the second aspect, the methods in the third aspect and any possible implementation manner of the third aspect, or the methods in the fourth aspect and any possible implementation manner of the fourth aspect.

[0072] In a fourteenth aspect, the present application provides a chip, which includes a processor (or logic circuit). Optionally, the chip may further include a communication interface (or interface) for implementing at least one of the following: the methods in the first aspect and any possible implementation manner of the first aspect, the methods in the second aspect and any possible implementation manner of the second aspect, the methods in the third aspect and any possible implementation manner of the third aspect, or the methods in the fourth aspect and any possible implementation manner of the fourth aspect.

[0073] In a possible implementation, if the chip is the smallest processing unit in a whole machine, the chip may be a processor, or may include a processor and a memory, or may further include a processor, a memory, and a transceiver for implementing at least one of the following: the methods in the first aspect and any possible implementation manner of the first aspect, the methods in the second aspect and any possible implementation manner of the second aspect, the methods in the third aspect and any possible implementation manner of the third aspect, or the methods in the fourth aspect and any possible implementation manner of the fourth aspect.

[0074] In a fifteenth aspect, the present application provides a chip system. The chip system includes a processor and an interface. Optionally, it may further include a memory for implementing at least one of the following: the methods in the first aspect and any possible implementation manner of the first aspect, the methods in the second aspect and any possible implementation manner of the second aspect, the methods in the third aspect and any possible implementation manner of the third aspect, or the methods in the fourth aspect and any possible implementation manner of the fourth aspect. The chip system may be composed of chips or may include chips and other discrete devices. Description of the Drawings

[0075] Figure 1A and Figure 1B is a schematic diagram of the communication system provided by the present application;

[0076] Figure 2 is a schematic diagram of a system of a rank enhancement scheme;

[0077] Figure 3 is a schematic flowchart of a communication method provided by the present application;

[0078] Figure 4 is a schematic diagram of a multipath angle information and a multipath angle spread information provided by the present application;

[0079] Figure 5 is a schematic diagram of the relationship between the multipath angle information and the signal-to-noise ratio provided by the present application;

[0080] Figure 6 is a schematic flowchart of another communication method provided by the present application;

[0081] Figure 7 A schematic diagram of the channel capacity provided by this application;

[0082] Figure 8 A schematic diagram of a communication device provided by this application;

[0083] Figure 9 A schematic diagram of another communication device provided by this application. Detailed implementation manners

[0084] In the embodiments of this application, " / " may indicate that the objects associated before and after are in an "or" relationship. For example, A / B may indicate A or B; "and / or" can be used to describe three relationships of associated objects. For example, A and / or B may indicate: A exists alone, A and B exist simultaneously, and B exists alone. Among them, A and B can be singular or plural.

[0085] In the embodiments of this application, words such as "first" and "second" may be used to distinguish technical features with the same or similar functions. These words such as "first" and "second" do not limit the quantity and execution order, and these words such as "first" and "second" do not necessarily limit to be different. In the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" should not be interpreted as being more preferred or having more advantages than other embodiments or design solutions. Using words such as "exemplary" or "for example" aims to present relevant concepts in a specific way for easy understanding.

[0086] "Transmission" and "reception" in the embodiments of this application represent the direction of signal transmission. For example, "transmitting information to the terminal" can be understood as the destination of this information is the terminal device, which may include directly transmitting through the air interface, and also includes indirectly transmitting through the air interface by other units or modules. "Receiving information from the network device" can be understood as the source of this information is the network device, which may include directly receiving from the network device through the air interface, and may also include indirectly receiving from the network device through the air interface by other units or modules. "Transmission" can also be understood as the "output" of the chip interface, and "reception" can also be understood as the "input" of the chip interface.

[0087] In other words, transmission and reception can be carried out between devices. For example, between a network device and a terminal device, or can be carried out within a device. For example, transmitting or receiving between components, modules, chips, software modules or hardware modules within a device through a bus, trace or interface.

[0088] It is understandable that necessary processing may be performed on information between the source end and the destination end where the information is sent, such as encoding, modulation, etc., but the destination end can understand the valid information from the source end. Similar expressions in this application can be understood similarly and will not be elaborated here.

[0089] In the embodiments of this application, "indication" may include direct indication and indirect indication, and may also include explicit indication and implicit indication. Taking the information indicated by a certain piece of information (such as the indication information described below) as the information to be indicated, there are many ways to indicate the information to be indicated in the specific implementation process. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated, etc. It is also possible to indirectly indicate the information to be indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated; it is also possible to only indicate a part of the information to be indicated, while the other parts of the information to be indicated are known or pre-agreed. For example, the arrangement order of each piece of information pre-agreed (such as protocol pre-definition) can be used to implement the indication of specific information, thereby reducing the indication overhead to a certain extent. This application does not limit the specific manner of indication. It is understandable that for the sender of the indication information, the indication information can be used to indicate the information to be indicated, and for the receiver of the indication information, the indication information can be used to determine the information to be indicated.

[0090] Next, the technical solutions in the embodiments of this application will be described in conjunction with the accompanying drawings in the embodiments of this application.

[0091] First, for the convenience of understanding, the definitions of relevant terms involved in this application are introduced in detail below:

[0092] 1. Multi-Input Multi-Output (MIMO) system:

[0093] MIMO technology utilizes the resources of the spatial dimension and can obtain array gain, multiplexing and diversity gain, and interference cancellation gain in space without increasing the system bandwidth, which is beneficial to improving the capacity and spectral efficiency of the communication system. For example, in the Long Term Evolution (LTE) system, the system can support up to 8-layer transmission using multiple antennas at the sending end and the receiving end. However, with the continuous improvement of people's communication requirements such as high rate, high reliability, and low latency, modern communication systems will continue to face challenges of greater capacity, wider coverage, and lower latency, and these requirements will also become the key requirements for the next-generation communication system.

[0094] 2. Reference signal:

[0095] In the demodulation process at the receiving end of a communication system, coherent demodulation has better performance than non-coherent demodulation. Therefore, coherent demodulation is more widely used in modern communication systems. In an orthogonal frequency division multiplexing (OFDM) system, the modulation of each carrier suppresses the carrier. Therefore, if coherent demodulation is to be implemented at the receiving end of an OFDM system, a reference signal is required; the reference signal is also called a pilot signal or a reference signal (RS). They are distributed on different resource elements (REs) in the two-dimensional space of the time domain and the frequency domain within an OFDM symbol, and have known amplitudes and phases.

[0096] Similarly, in a MIMO system, each transmitting antenna (virtual antenna or physical antenna) has an independent data channel. Based on the preset RS signal, the receiver performs channel estimation for each transmitting antenna and restores the transmitted data based on this. Among them, channel estimation refers to the process of reconstructing the received signal to compensate for channel fading and noise. Specifically, it refers to using the known RS of the transmitter and the receiver to track the time-domain and frequency-domain changes of the channel. For example, in order to implement channel quality measurement and data demodulation of a high-order multi-antenna system, multiple reference signals are defined respectively: cell-specific reference signals (CRS), demodulation reference signal (DMRS), sounding reference signal (SRS), channel state information-reference signal (CSI-RS), etc. Among them, DMRS is used for the demodulation of the physical downlink shared channel (PDSCH) or the physical uplink shared channel (PUSCH). CSI-RS is used for channel information measurement and to report information such as channel quality indicator (CQI), precoding matrix indicator (PMI), and rank indicator (RI).

[0097] 3. Metasurface:

[0098] (1) The meaning of metasurface:

[0099] In the complex evolution process of wireless communication systems, high throughput and large connection have always been the core challenges and pursuit goals of wireless communication networks. To address the above challenges, reconfigurable intelligent surfaces (RIS), which can also be referred to as intelligent reflecting surfaces (IRS), large intelligent surfaces (LIS), or meta-surfaces, as a technology with great potential, have begun to be widely studied. For example, RIS-assisted networks that control channel characteristics through RIS elements are considered key enabling technologies for expanding the coverage of wireless communication networks.

[0100] Common application scenarios of meta-surfaces are coverage enhancement and blind spot filling. For example, deploying one or more RIS at the cell edge or in coverage blind spots caused by occlusion or deep fading can achieve the effect of extending the coverage range and filling in blind spots. Another possible application scenario of RIS is rank enhancement. The principle is that based on the fact that RIS can actively change the channel, it can provide more transmission paths with controllable gains. The radio access network (RAN) or base station (BS) can use RIS to actively control the quality of the wireless channel between the base station and the user equipment (UE) (such as enhancing link gain, increasing the number of eigen sub-channels, etc.). For example, in a centimeter-wave frequency (such as 10 gigahertz (GHz)) RIS-MIMO system, it has lower path loss and richer scattering compared to higher frequencies, and the number of antennas in the centimeter-wave band can be very large, thus providing a high degree of spatial freedom; however, the physical environment such as the multipath distribution situation is not sufficient to support high-stream number transmission. Therefore, in addition to the coverage enhancement function, rank enhancement may be one of the potential main features of centimeter-wave RIS-MIMO systems.

[0101] 4. Network architecture:

[0102] The communication method provided in this application can be applied to various communication systems. For example, it can be a 5G (or new radio (NR)) communication system, or a transitional system between an LTE communication system and a 5G communication system, which can also be referred to as a 4.5G communication system. Of course, it can also be a future communication system, such as a sixth-generation (6G) or even seventh-generation (7G) system, etc. The network architecture and service scenarios described in the embodiments of this application are to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. Those of ordinary skill in the art know that with the evolution of the communication network architecture and the emergence of new service scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0103] For example,Figure 1A and Figure 1B is a schematic diagram of the communication system provided by this application. The communication system includes at least one network device 110 and at least one terminal 120. The network device 110 and the terminal 120 can be connected to each other wirelessly. Figure 1A and Figure 1B is just an example, and this application does not limit the number of network devices and terminals. Among them, the communication system further includes a metasurface 130, and it is assumed that the metasurface 130 is on the surface of the network device 110 (such as Figure 1A shown) or on the surface of the terminal 120 (such as Figure 1B shown). For example, the metasurface 130 can be a layer of surface material layer with one or more of the functions of reflection, transmission, and refraction. The surface material layer is attached to the antenna of the network device 110 or the terminal 120 to achieve rank enhancement (based on the metasurface can actively change the channel, and provide more propagation multipaths with controllable gain based on the response difference to different multipath angles). Optionally, the metasurface can also be represented as a reconfigurable intelligent surface (RIS), and can also be called an intelligent reflecting surface (IRS), a large intelligent surface (LIS), or any other name for the metasurface, which is not limited in this application.

[0104] The following introduces the network device and the terminal involved in this application.

[0105] The terminal can be a wireless terminal device capable of receiving scheduling information and indication information from a network device. The terminal can be a device that provides voice and / or data connectivity to a user, or a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem. The terminal is also known as user equipment (UE), mobile station (MS), mobile terminal (MT), customer premise equipment (CPE), terminal device, etc. The terminal is a device that includes wireless communication capabilities (providing voice / data connectivity to the user). For example, a handheld device with wireless connection capabilities, or an in-vehicle device, etc. Currently, some examples of terminals are: mobile phone, tablet computer, laptop computer, palmtop computer, mobile Internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in vehicle networking, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, or wireless terminal in smart home, etc. For example, the wireless terminal in self-driving can be a drone, helicopter, or airplane, etc. For example, the wireless terminal in vehicle networking can be an in-vehicle device, a whole vehicle device, an in-vehicle module, a vehicle, or a ship, etc. The wireless terminal in industrial control can be a camera, a robot, or a robotic arm, etc. The wireless terminal in smart home can be a TV, an air conditioner, a floor sweeper, a speaker, or a set-top box, etc.

[0106] It should be noted that the terminal can be a device or apparatus with a chip, or a device or apparatus integrated with a circuit, or a chip, chip system, module, or control unit in the above-mentioned devices or apparatuses. Specifically, the present application does not make any limitations. It should be noted that in the present application, when referring to the terminal, it can refer to the terminal itself, or the chip, functional module, or integrated circuit in the terminal that completes the method provided in the present application. Specifically, the present application does not make any limitations.

[0107] 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 to provide wireless communication functions 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, and can also be referred to as an access network device, a RAN entity, an access node, a network node, or a communication device, etc.

[0108] Specifically, the network device can 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 can also be an access network device in an open RAN (O-RAN or ORAN) or a cloud radio access network (CRAN). Or, the network device can also be an access network device in a communication system obtained by integrating two or more of the above communication systems.

[0109] Network devices include, but are not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), access point (AP) in a wireless fidelity (WIFI) system, macro base station, micro base station, wireless relay node, donor node, wireless controller in a CRAN scenario, wireless backhaul node, transmission point (TP), or transmission and receiving point (TRP), etc. It can also be a network device in a 5G mobile communication system. For example, the next generation Node B (gNB), TRP, TP in an NR system; or one or a group (including multiple antenna panels) of antenna panels of a base station in a 5G mobile communication system; or the network device can also be a network node that constitutes a gNB or a transmission point. For example, centralized unit (CU), distributed unit (DU), centralized unit - control plane (CU - CP), centralized unit - user plane (CU - UP), or radio unit (RU), etc. The CU and DU can be set separately, or can also be included in the same network element, e.g., BBU. The RU can be included in a radio frequency device or radio frequency unit. For example, in a remote radio unit (RRU), active antenna unit (AAU), or remote radio head (RRH). Or, the network device can also be a server, wearable device, vehicle, or in - vehicle device, etc. For example, the access network device in V2X technology can be a road side unit (RSU).

[0110] It should be noted that in different systems, the CU (or CU-CP and CU-UP), DU, or RU may also have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (ORAN) system, the CU may also be referred to as an open centralized unit (O-CU) or an open CU, the DU may also be referred to as an open distributed unit (O-DU), the CU-CP may also be referred to as an open centralized unit control plane (O-CU-CP), the CU-UP may also be referred to as an open centralized unit user plane (O-CU-UP), and the RU may also be referred to as an open radio unit (O-RU). The specific definitions in this application are not limited. Any one of the CU, CU-CP, CU-UP, DU, and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0111] Optionally, for network elements in the ORAN system, each network element can implement the protocol layer functions as shown in Table 1 below.

[0112] Table 1

[0113]

[0114] It should be noted that in the ORAN system, the network device in this application can be one or more of the network elements in Table 1 above.

[0115] Next, the architectures of the CU and DU of the access network device are introduced. The access network device includes at least one CU and at least one DU. Optionally, the access network device further includes at least one RU.

[0116] The following takes the access network device including a CU and a DU as an example for introduction. The CU has some functions of the core network. The CU may include a CU-CP and a CU-UP. The CU and the DU can 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 (such as the RRC layer and / or the SDAP layer). The DU is configured to implement the protocol layers below the PDCP layer (such as the RLC layer, the MAC layer, and / or the physical (PHY) layer). Another example is that the CU is configured to implement 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 protocol layers at and below the PDCP layer (such as the RLC layer, the MAC layer, and / or the PHY layer, etc.).

[0117] When the CU includes a CU-CP and a CU-UP, the CU-CP is used to implement the control plane function of the CU, and the CU-UP is used to implement the user plane function of the CU. For example, when the CU is configured to implement the functions of the PDCP layer, the RRC layer, and the SDAP layer, the CU-CP is used to implement the functions of the RRC layer and the control plane function of the PDCP layer, and the CU-UP is used to implement the functions of the SDAP layer and the user plane function of the PDCP layer.

[0118] The above configurations of the CU and the DU are only examples, and the functions of the CU and the DU can also be configured according to needs. For example, the CU or the DU can be configured to have the functions of more protocol layers, or the CU or the DU can be configured to have partial processing functions of the protocol layers. For example, some functions of the RLC layer and the protocol layers above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the protocol layers below the RLC layer are set in the DU. Another example is that the functions of the CU or the DU can be divided according to the service type or other system requirements. For example, divided by latency, the functions that need to meet the requirement of small latency in processing time are set in the DU, and the functions that do not need to meet this latency requirement are set in the CU.

[0119] The DU and the RU can cooperate to jointly implement the functions of the PHY layer. One DU can be connected to one or more RUs. The functions of the DU and the RU can be configured in various ways according to the design. For example, the DU is configured to implement baseband functions, and the RU is configured to implement mid-RF functions. Another example is that 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 implement both the low-layer functions and RF functions. The high-layer functions in the physical layer can include a part of the functions of the physical layer that is closer to the MAC layer, and the low-layer functions in the physical layer can include another part of the functions of the physical layer that is closer to the mid-RF side.

[0120] It should be noted that the network device can be a device or apparatus with a chip, or a device or apparatus integrated with a circuit, or a chip, chip system, module, or control unit in the aforementioned shown device or apparatus. Specifically, the present application does not make any limitations. It should be noted that in the present application, when referring to a network device, it can refer to the network device itself, or a chip, functional module, or integrated circuit in the network device that completes the method provided in the present application. Specifically, the present application does not make any limitations.

[0121] Optionally, a common rank enhancement network architecture further includes a metasurface as an intermediate node for implementing a forwarding function similar to relay or integrated access and backhaul (IAB). For example, Figure 2 FIG. is a schematic diagram of a system for a rank enhancement scheme. The system includes a network device 110, a terminal 120, and a metasurface 130; and the metasurface 130 is used as an intermediate node to implement the forwarding function. Assuming that the channel between the network device 110 and the terminal 120 is represented as H0, the channel between the network device 110 and the metasurface 130 is represented as H1, and the channel between the metasurface 130 and the terminal 120 is represented as H2, taking the downlink transmission as an example, the received signal satisfies Equation (1):

[0122] Y = H0 + H1 * W * H2 (1)

[0123] where Y represents the received signal and W represents the weighting coefficient matrix of the metasurface. Therefore, compared with the traditional H0 channel, the metasurface additionally provides an H1 * W * H2 channel to improve the communication rank. However, in the scenario where the metasurface is used as an intermediate node, only when the quality of the direct channel (such as H0) is poor or the channel gains of the cascaded channels (such as H1 and H2) and the direct channel are comparable, the signal-to-noise ratio (SNR) performance gain of the user will not decrease sharply, thus limiting the gain scenario of the existing rank enhancement scheme.

[0124] To solve the problem that the gain scenario of the existing rank enhancement scheme is limited, the present application provides corresponding technical solutions. By means of the first indication information, the first device and the second device interact to determine the rank enhancement effective interval, so that based on the metasurface and the response difference to different multipath angles, the transmission rank can be improved, and the system capacity can be enhanced. For specific details, please refer to the relevant descriptions of the embodiments hereinafter.

[0125] II. Communication method provided by the present application:

[0126] 1. The first type of communication method provided by the present application (the first device includes a metasurface, the second device sends a reference signal, and the first device performs rank enhancement channel measurement and feedback):

[0127] For example, Figure 3 is a schematic flowchart of a communication method provided by the present application. This method can be implemented through the interaction between the first device and the second device. For example, when the first device is a network device, the second device is a terminal; when the first device is a terminal, the second device is a network device. This method includes the following steps:

[0128] S101, the first device receives a first reference signal from the second device through the metasurface.

[0129] Among them, the second device sends the first reference signal to the first device. The present application assumes that the first device includes a metasurface; for example, the metasurface can be a reflective layer attached to the antenna of the first device to achieve rank enhancement. Optionally, the metasurface can be referred to as RIS, or IRS, or LIS, or meta-surface, or metasurface, or reflective surface, etc., which is not limited in the present application. For the convenience of description, it is collectively referred to as the metasurface hereinafter. Optionally, the metasurface can be independently deployed from the first device to achieve the rank enhancement function, which is not limited in the present application.

[0130] In one possible implementation, the first device is a terminal and the second device is a network device, then the first reference signal can be a downlink reference signal, such as the first CSI-RS, etc. In another possible implementation, the first device is a network device and the second device is a terminal, and the first reference signal can be an uplink reference signal, such as the first SRS, etc.

[0131] Optionally, the second device sends a first reference signal to the first device according to a preset period; correspondingly, the first device receives the first reference signal from the second device through the meta-surface according to the preset period. Optionally, the preset period may be the measurement period of the first reference signal. For example, assuming that the first reference signal is the first CSI-RS, the preset period may be the CSI measurement period. Optionally, the measurement period of the first reference signal includes the measurement and feedback period of the first reference signal. For example, assuming that the first reference signal is the first CSI-RS, the measurement period of the first reference signal includes the measurement of the first CSI-RS and the feedback period of the CSI.

[0132] S102, the first device performs rank-enhanced channel measurement based on the first reference signal to obtain the channel measurement information between the first device and the second device.

[0133] Among them, the first device includes a meta-surface. When the meta-surface of the first device is used for rank-enhanced channel measurement, it is weighted with a unit weighting coefficient matrix. And when the first device performs rank-enhanced channel measurement, the state of the unit weighting coefficient matrix is the meta-surface default state. Therefore, when the first device performs rank-enhanced channel measurement based on the first reference signal, specifically, the first device performs periodic rank-enhanced channel measurement based on the first reference signal and the meta-surface related parameters (such as the unit weighting coefficient matrix), so as to obtain the channel measurement information between the first device and the second device. Optionally, the unit weighting coefficient matrix includes parameters such as a vector or matrix of phases. The elements of the vector or the diagonal elements of the matrix are all 1, and the other elements of the matrix can take values of 0.

[0134] Optionally, the measurement period of the rank-enhanced channel measurement is greater than or equal to the measurement period of the second reference signal; the signal type of the second reference signal is the same as or different from the signal type of the first reference signal. For example, assuming that the signal types of the first reference signal and the second reference signal are the same (such as both being CSI-RS), the rank-enhanced channel measurement can be independent of the CSI measurement, and the measurement period of the rank-enhanced channel measurement is greater than the CSI measurement period. Optionally, the measurement period of the rank-enhanced channel measurement includes the measurement and feedback period. For example, the measurement period of performing rank-enhanced channel measurement based on the first reference signal includes the measurement of the first reference signal and the feedback period of the channel measurement information (such as the feedback period of the first indication information).

[0135] Optionally, the channel measurement information includes at least one of multipath angle spread information or multipath angle information. Optionally, multipath is a short name for multiple propagation paths, which refers to multiple propagation paths formed based on multiple antennas and a metasurface when a signal is transmitted between a first device and a second device. The multiple propagation paths may include a line of sight (LOS) path and a non-line of sight (NLOS) path between the first device and the second device. When the metasurface is deployed on the first device or the second device, all the multiple propagation paths pass through the metasurface.

[0136] Optionally, the multipath angle information includes at least one of the following: average of two-dimensional incident angles of multipaths, average of two-dimensional departure angles of multipaths. Among them, the average of two-dimensional incident angles of multipaths or the average of two-dimensional departure angles of multipaths may be the arithmetic mean of angles, or the geometric mean of angles, or the root mean square of the power spectrum density (PSD), etc., which is not limited in this application.

[0137] Optionally, the multipath angle spread information includes at least one of the following: azimuth spread of arrival angle (ASA) of multipaths, zenith spread of arrival angle (ZSA) of multipaths, azimuth spread of departure angle (ASD) of multipaths, zenith spread of departure angle (ZSD) of multipaths. Among them, the multipath angle spread information may be defined as the maximum included angle between multipaths within a cluster, or the second-order central moment information of the power angular spectrum (PAS).

[0138] Optionally, the above multipath angle information may include the average of the two-dimensional incident angles of the multipath and / or the average of the two-dimensional outgoing angles of the multipath (in this case, the multipath angle information may be abbreviated as the multipath angle); the multipath angle spread information may include at least one of ASA / ZSA / ASD / ZSD (in this case, the multipath angle spread information may be abbreviated as the multipath angle spread). Optionally, the multipath angle information is a type of indication information (for example, 2-bit indication information), and this type of indication information is used to indicate the average of the two-dimensional incident angles of the multipath and / or the average of the two-dimensional outgoing angles of the multipath (equivalent to the multipath angle information indirectly including the average of the two-dimensional incident angles of the multipath and / or the average of the two-dimensional outgoing angles of the multipath), and the multipath angle spread information is another type of indication information, and this type of indication information is used to indicate at least one of ASA / ZSA / ASD / ZSD (equivalent to the multipath angle spread information indirectly including at least one of ASA / ZSA / ASD / ZSD).

[0139] For example, Figure 4 is a schematic diagram of a multipath angle information and a multipath angle spread information provided by this application. Figure 4 The multiple solid lines in can be regarded as multiple propagation paths, and the multiple propagation paths form a cluster, such as Figure 4 shown by the conical shape of. Among them, φ is Figure 4 the angle between the horizontal dotted line in and the center line of the cone (that is, the average of the two-dimensional angles of the multipath), which can represent the multipath angle information. θ is the maximum angle between the multipaths within the cluster, which can represent the multipath angle spread information. Optionally, if the multipath angle spread information is the second-order central moment information of the multipath PAS, the process of deriving the multipath angle spread information based on θ satisfies formulas (2) and (3):

[0140]

[0141]

[0142] Among them, represents the PAS angle mean value, and Θ represents the square root of the second-order central moment of the PAS (that is, the multipath angle spread information).

[0143] Optionally, the multipath angle spread information can also be referred to as the angle spread information of multiple propagation paths, and the multipath angle information can also be referred to as the angle information of multiple propagation paths. For example, the multipath angle information includes the average of the angles of multiple propagation paths, and the multipath angle spread information includes the maximum angle between the multipaths within the cluster formed by multiple propagation paths.

[0144] Optionally, the channel measurement information further includes at least one of a transmit antenna dimension or a receive antenna dimension. Among them, the transmit antenna dimension or the receive antenna dimension can be considered separately for the vertical dimension M and the horizontal dimension N. Optionally, the transmit antenna dimension and / or the receive antenna dimension are used to determine the antenna beamwidth, which may affect the multipath angle spread information and the multipath angle information.

[0145] S103, the first device sends first indication information to the second device; correspondingly, the second device receives the first indication information.

[0146] Among them, the first indication information is used to indicate at least one of the first information or the second information. The first information includes at least one of the multipath angle spread information or the multipath angle information, and the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information.

[0147] Among them, the multipath angle spread information and / or the multipath angle information can refer to the corresponding description above and will not be elaborated here. Below, the rank enhancement activation mode and the rank enhancement activation threshold will be introduced in combination with the multipath angle spread information and / or the multipath angle information.

[0148] The rank enhancement activation threshold includes at least one of the following: a reference signal receiving power (RSRP) threshold, a signal to noise ratio (SNR) threshold, a signal interference noise ratio (SINR) threshold, a channel quality indicator (CQI) index threshold, or a modulation and coding scheme (MCS) index threshold. Moreover, the rank enhancement activation threshold is related to at least one of the multipath angle spread information or the multipath angle information. For example, Figure 5 This is a schematic diagram of the relationship between the multipath angle information and the signal to noise ratio provided by this application. Among them, Figure 5It includes 4 clusters, and each cluster includes multipaths. For example, assume that the characteristics of cluster 1 are that the incident angle satisfies 0 to 90°, the number of multipaths is 15, the arrival angle of multipaths satisfies 0 to 0.6°, and the cluster scattering surface area is 0.44 meters (m) × 0.88 m; the characteristics of cluster 2 are that the incident angle satisfies 70 to 90°, the number of multipaths is 15, the arrival angle of multipaths satisfies 0 to 5°, and the cluster scattering surface area is 4 m × 2 m; the characteristics of cluster 3 are that the incident angle satisfies 0 to 60°, the number of multipaths is 15, the arrival angle of multipaths satisfies 0 to 1°, and the cluster scattering surface area is 0.88 m × 0.44 m; the characteristics of cluster 4 are that the incident angle satisfies 0 to 60°, the number of multipaths is 15, the arrival angle of multipaths satisfies 0 to 5°, and the cluster scattering surface area is 4 m × 2 m. And assume that the metasurface weighting coefficient matrix W is a random complex matrix, and different multipaths are multiplied by different W matrices respectively. Based on the above assumptions, the levels related to the signal-to-noise ratio corresponding to clusters 1 to 4 can be derived as Figure 5 shown. Among them, with the change of the incident angle and the arrival angle of multipaths, the signal-to-noise ratio distribution regions corresponding to the ranks of the signals after being reflected by the metasurface or not being reflected by the metasurface are different. Therefore, different multipath angle spread information and / or multipath angle information correspond to different rank-enhanced signal-to-noise ratio threshold intervals. Thus, based on the signal-to-noise ratio threshold intervals, it can be determined that CSI measurement and data transmission are performed based on the enhanced rank (that is, CSI measurement and data transmission are performed based on the corresponding metasurface weighting coefficient matrix W). Optionally, when the rank-enhanced effective threshold is other thresholds such as the RSRP threshold and the SINR threshold, the relationship with the multipath angle spread information and / or multipath angle information is similar, and this application does not make a limitation.

[0149] The rank-enhanced effective mode is used to indicate whether the rank-enhanced effective interval is an open interval or a closed interval, and the rank-enhanced effective interval is an open interval or a closed interval determined based on the rank-enhanced effective threshold. For example, the rank-enhanced effective mode includes at least two modes, the open interval mode and / or the closed interval mode; optionally, the open interval mode can be further divided into a unilateral open interval or a bilateral open interval. For example, the unilateral open interval can be expressed as [, Δ1] or [Δ2, ], and the bilateral open interval can be expressed as [, Δ1] ∪ [Δ2, ]; where, Δ1 or Δ2 represents the threshold. The closed interval can be expressed as [Δ1, Δ2], assuming Δ1 < Δ2. Optionally, Δ1 or Δ2 can be any one of the rank-enhanced effective thresholds described above, such as the SNR threshold or the RSRP threshold, etc., and this application does not make a limitation.

[0150] Optionally, the rank enhancement effective range is the SNR range or the SINR range or the RSRP range. Optionally, when reference signal measurements are performed between a first device and a second device, for example, when CSI measurements are performed between the first device and the second device, information such as SNR / SINR / RSRP can be measured. If the SNR / SINR / RSRP value in the channel measurement result belongs to the rank enhancement effective range, for example, if the measured SNR value belongs to the rank enhancement SNR effective range, it indicates that the current network scenario meets the requirements of the rank enhancement effective range, and rank enhancement operations can be performed. If subsequent CSI measurements and data transmissions are involved, the subsequent CSI measurements and data transmissions are both based on the enhanced rank, thereby avoiding a decrease in system performance gain due to rank enhancement in some network scenarios.

[0151] Optionally, the rank enhancement effective mode is indicated by at least two bits. For example, the rank enhancement effective mode can be implemented by at least two bits in an independent cell, or by at least two reserved bits in an existing cell. The specific implementation method is shown in Table 2.

[0152] Table 2: Table of rank enhancement effective modes.

[0153] Mode Type 0 <![CDATA[[Δ1,Δ2]]]> 1 <![CDATA[[,Δ1]∪[Δ2,]]]> 2 <![CDATA[[,Δ1]]]> 3 <![CDATA[[Δ2,]]]>

[0154] Among them, the 4 states shown in Table 2 can be indicated by at least two bits. For example, the first indication information is used to indicate the mode of Table 2, and the rank enhancement effective mode can be determined in combination with Table 2; or, the first indication information is used to indicate the type of Table 2, and the rank enhancement effective mode can be directly determined.

[0155] Optionally, the rank enhancement effective threshold includes at least one of the maximum value or the minimum value of the rank enhancement effective range; or, the rank enhancement effective threshold includes a first value and a duration unit length, and the first value and the duration unit length are used to determine at least one of the maximum value or the minimum value of the rank enhancement effective range. For example, the first indication information is used to indicate the rank enhancement effective threshold, which can specifically be to indicate at least one of the maximum value or the minimum value of the rank enhancement effective range (such as indicating the numerical values of Δ1 and / or Δ2); or, the first indication information is used to indicate the first value (assumed to be α) and the duration unit length (assumed to be β), and based on α and β, the numerical values of Δ1 and / or Δ2 can be determined (for example, Δ1 = α - β, Δ2 = α + β). Optionally, the specific implementation method for determining the rank enhancement effective threshold based on the first value and the duration unit length is not limited in this application.

[0156] In a possible implementation, when the first indication information is used to indicate the first information, the first indication information is used to indicate at least one of the multipath angle spread information or the multipath angle information. In this implementation, the first device and the second device pre-define a mapping relationship or a functional relationship, so that based on the first information and the pre-defined mapping relationship or functional relationship, the rank enhancement activation mode and the rank enhancement activation threshold can be determined, and thus the rank enhancement activation interval can be determined. The possible mapping relationships or functional relationships are described below.

[0157] (1) The first information is related to the first mapping relationship, the second mapping relationship, or the third mapping relationship.

[0158] In a possible implementation, the first information includes at least one multipath angle spread information, and the first mapping relationship includes multiple rank enhancement activation modes and multiple rank enhancement activation thresholds corresponding to multiple multipath angle spread information. Optionally, based on the first mapping relationship, it can be deduced that the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information. For example, Table 3 is a table of the first mapping relationship, including multiple multipath angle spread information, as well as multiple rank enhancement activation modes and multiple rank enhancement activation thresholds.

[0159] Table 3: Table of the first mapping relationship.

[0160] Index Parameter Rank enhancement activation mode Rank enhancement activation threshold 1 Rank enhancement activation threshold 2 1 <![CDATA[Θ1]]> 1 0 25 2 <![CDATA[Θ2]]> 2 10 20 … … … … …

[0161] Among them, the parameters in Table 3 include multipath angle spread information. For example, Θ1 and Θ2 represent multiple different multipath angle spread information. Θ1 corresponds to rank enhancement effective mode 1 (i.e., mode 1 in Table 2, and the type of the rank enhancement effective interval is a bilateral open interval [,Δ1]∪[Δ2,]). Θ1 corresponds to rank enhancement effective thresholds 1 and 2, which are 0 and 25 respectively. Combining the above information, it can be deduced that the rank enhancement effective interval corresponding to Θ1 is [,0]∪[25,]. Similarly, Θ2 corresponds to rank enhancement effective mode 2 (i.e., mode 2 in Table 2, and the type of the rank enhancement effective interval is a unilateral open interval [,Δ1]). Θ2 corresponds to rank enhancement effective thresholds 1 and 2, which are 10 and 20 respectively. Combining the above information, it can be deduced that the rank enhancement effective interval corresponding to Θ2 is [,10] or [,20]. Therefore, when the first indication information is used to indicate the first information (including at least one multipath angle spread information), the first device can determine the rank enhancement effective interval corresponding to the multipath angle spread information based on the first information and in combination with the first mapping relationship shown in Table 3, so that both the first device and the second device adopt the same rank enhancement effective interval for rank enhancement channel measurement. For example, if the first indication information is used to indicate the multipath angle spread information Θ1, after receiving the first indication information, the second device looks up the corresponding rank enhancement effective mode 1 and rank enhancement effective thresholds 0 and 25 from Table 3 based on Θ1, then the second device can determine that the rank enhancement effective interval is [,0]∪[25,].

[0162] Optionally, the first mapping relationship shown in Table 3 above is only an example. The relationship between the parameters, rank enhancement effective mode, and rank enhancement effective thresholds in the first mapping relationship can be a one-to-one correspondence, or a one-to-many relationship (for example, the parameter Θ1 may also correspond to rank enhancement effective mode 1 and rank enhancement effective thresholds 5 and 20), or a many-to-one relationship (for example, the parameter Θ1 may also correspond to rank enhancement effective mode 2 and rank enhancement effective thresholds 10 and 20, that is, the parameters Θ1 and Θ2 correspond to the same rank enhancement effective mode and rank enhancement effective thresholds). This application does not make any limitations.

[0163] In another possible implementation, the first information includes at least one set of multipath angle spread information and multipath angle information, and the second mapping relationship includes multiple rank enhancement effective modes and multiple rank enhancement effective thresholds corresponding to multiple sets of multipath angle spread information and multipath angle information. For example, Table 4 is a table of the second mapping relationship, including multiple sets of multipath angle spread information and multipath angle information, as well as multiple rank enhancement effective modes and multiple rank enhancement effective thresholds.

[0164] Table 4: Table of the second mapping relationship.

[0165] Index Parameter Rank enhancement activation mode Rank enhancement activation threshold 1 Rank enhancement activation threshold 2 1 <![CDATA[(Θ1,φ1)]]> 1 0 25 2 <![CDATA[(Θ2,φ2)]]> 2 10 20 … … … … …

[0166] Among them, the parameters in Table 4 include multipath angle spread information and multipath angle information. For example, (Θ1, φ1) and (Θ2, φ2) represent multiple groups of different multipath angle spread information and multipath angle information. (Θ1, φ1) corresponds to rank enhancement activation mode 1 (i.e., mode 1 in Table 2, and the type of the rank enhancement activation interval is a bilateral open interval [, Δ1] ∪ [Δ2,]). (Θ1, φ1) corresponds to rank enhancement activation thresholds 1 and 2, which are 0 and 25 respectively. Combining the above information, it can be deduced that the rank enhancement activation interval corresponding to (Θ1, φ1) is [, 0] ∪ [25,]. Similarly, (Θ2, φ2) corresponds to rank enhancement activation mode 2 (i.e., mode 2 in Table 2, and the type of the rank enhancement activation interval is a unilateral open interval [, Δ1]). (Θ2, φ2) corresponds to rank enhancement activation thresholds 1 and 2, which are 10 and 20 respectively. Combining the above information, it can be deduced that the rank enhancement activation interval corresponding to (Θ2, φ2) is [, 10] or [, 20]. Therefore, when the first indication information is used to indicate the first information (including at least one group of multipath angle spread information and multipath angle information), based on the first information and combined with the second mapping relationship shown in Table 4, the rank enhancement activation interval corresponding to the multipath angle spread information and the multipath angle information can be determined, so that both the first device and the second device adopt the same rank enhancement activation interval for rank enhancement channel measurement. For example, if the first indication information is used to indicate the multipath angle spread information and the multipath angle information (Θ1, φ1), after receiving the first indication information, the second device looks up the corresponding rank enhancement activation mode 1 and rank enhancement activation thresholds 0 and 25 from Table 4 based on (Θ1, φ1), then the second device can determine that the rank enhancement activation interval is [, 0] ∪ [25,]. It can be understood that the difference between the second mapping relationship and the first mapping relationship is that the parameters of the second mapping relationship also include multipath angle information; the meanings of other variables in Table 4 are the same as those in Table 3.

[0167] Optionally, the second mapping relationship shown in Table 4 above is only an example. The relationship between the parameters, rank enhancement activation mode, and rank enhancement activation threshold in the second mapping relationship can be a one-to-one correspondence, or a one-to-many relationship (for example, the parameter (Θ1, φ1) may also correspond to rank enhancement activation mode 1 and rank enhancement activation thresholds 5 and 20), or a many-to-one relationship (for example, the parameter (Θ1, φ1) may also correspond to rank enhancement activation mode 2 and rank enhancement activation thresholds 10 and 20, that is, the parameters (Θ1, φ1) and (Θ2, φ2) correspond to the same rank enhancement activation mode and rank enhancement activation threshold). The present application does not make any limitations.

[0168] In another possible implementation, the first information includes at least one set of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal. The third mapping relationship includes multiple sets of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal, and the corresponding multiple rank enhancement activation modes and multiple rank enhancement activation thresholds. For example, Table 5 is a table of the third mapping relationship, including multiple sets of multipath angle spread information and multipath angle information, as well as multiple rank enhancement activation modes and multiple rank enhancement activation thresholds.

[0169] Table 5: Table of the third mapping relationship.

[0170]

[0171] Among them, the parameters in Table 5 include multipath angle spread information, multipath angle information, and the dimension of the transmit antenna. For example, (Θ1, φ1) and (Θ2, φ2) represent multiple sets of different multipath angle spread information and multipath angle information. Each set of multipath angle spread information and multipath angle information corresponds to the vertical dimension M of the transmit antenna, and the vertical dimension M of the transmit antenna satisfies being greater than or less than the dimension M1, as shown in Table 5. Similar to Tables 3 and 4, (Θ1, φ1) and the transmit antenna dimension M < M1 or M > M1 correspond to the rank enhancement effective mode 1 (that is, mode 1 in Table 2, and the type of the rank enhancement effective interval is a bilateral open interval [, Δ1] ∪ [Δ2,]). (Θ1, φ1) corresponds to the rank enhancement effective thresholds 1 and 2, which are 0 and 25 respectively. Combining the above information, it can be deduced that the rank enhancement effective interval corresponding to (Θ1, φ1) is [, 0] ∪ [25,]. Similarly, (Θ2, φ2) and the transmit antenna dimension M < M1 or M > M1 correspond to the rank enhancement effective mode 2 (that is, mode 2 in Table 2, and the type of the rank enhancement effective interval is a unilateral open interval [, Δ1]). (Θ2, φ2) corresponds to the rank enhancement effective thresholds 1 and 2, which are 10 and 20 respectively. Combining the above information, it can be deduced that the rank enhancement effective interval corresponding to (Θ2, φ2) is [, 10] or [, 20]. Similarly, (Θ3, φ3) and the transmit antenna dimension M > M1 correspond to the rank enhancement effective mode 2. (Θ3, φ3) corresponds to the rank enhancement effective thresholds 1 and 2, which are 15 and 25 respectively. Combining the above information, it can be deduced that the rank enhancement effective interval corresponding to (Θ3, φ3) is [, 15] or [, 25]. Therefore, when the first indication information is used to indicate the first information (including at least one set of multipath angle spread information, multipath angle information, and the dimension of the transmit antenna of the first reference signal), based on the first information and combined with the third mapping relationship shown in Table 5, the rank enhancement effective interval corresponding to the multipath angle spread information, multipath angle information, and the dimension of the transmit antenna of the first reference signal can be determined, so that both the first device and the second device adopt the same rank enhancement effective interval for rank enhancement channel measurement. For example, if the first indication information is used to indicate the multipath angle spread information and multipath angle information (Θ1, φ1) and the antenna dimension M < M1, after receiving the first indication information, the second device looks up the corresponding rank enhancement effective mode 1 and rank enhancement effective thresholds 0 and 25 from Table 5 based on (Θ1, φ1) and M < M1, then the second device can determine that the rank enhancement effective interval is [, 0] ∪ [25,]. It can be understood that the difference between the third mapping relationship and the second mapping relationship is that the parameters of the third mapping relationship also include the dimension of the transmit antenna; the meanings of other variables in Table 5 are the same as those in Table 4.

[0172] Optionally, the third mapping relationship shown in Table 5 above is only an example. The parameters, rank enhancement activation mode, and rank enhancement activation threshold in the third mapping relationship may be in a one-to-one correspondence, or a one-to-many relationship (for example, the parameters (Θ1, φ1) and M < M1 may also correspond to rank enhancement activation mode 1 and rank enhancement activation thresholds 5 and 20), or a many-to-one relationship (for example, the parameters (Θ1, φ1) and M < M1 may also correspond to rank enhancement activation mode 2 and rank enhancement activation thresholds 10 and 20, that is, the parameters (Θ1, φ1) and M < M1 and the parameters (Θ2, φ2) and M < M1 correspond to the same rank enhancement activation mode and rank enhancement activation threshold). This application does not make any limitations.

[0173] Optionally, based on the above first mapping relationship, second mapping relationship, or third mapping relationship, it can be deduced that the rank enhancement activation mode and rank enhancement activation threshold are related to at least one of the multipath angle spread information or multipath angle information. Optionally, the above first mapping relationship, second mapping relationship, or third mapping relationship may be a predefined mapping relationship, and it is assumed that both the first device and the second device can predefine the above mapping relationship. Therefore, through the first indication information between the first device and the second device, information such as the rank enhancement activation mode, rank enhancement activation threshold, multipath angle spread information, and multipath angle information can be exchanged, so that both the first device and the second device can determine the corresponding rank enhancement activation interval, which is conducive to realizing the improvement of the transmission rank.

[0174] (2) The first information is related to the first functional relationship, the second functional relationship, or the third functional relationship.

[0175] Optionally, the input parameters of the first functional relationship include multipath angle spread information, and the output parameters include the rank enhancement activation mode and rank enhancement activation threshold. For example, the first functional relationship satisfies formula (4):

[0176] Y1 = f1(Θ) (4)

[0177] Where f1 represents the first functional relationship, Θ represents the input parameter of the first functional relationship, and Y1 represents the output parameter of the first functional relationship, including the rank enhancement activation mode and rank enhancement activation threshold (the rank enhancement activation mode and rank enhancement activation threshold shown in Table 3).

[0178] Optionally, the input parameters of the second functional relationship include multipath angle spread information and multipath angle information, and the output parameters include the rank enhancement activation mode and rank enhancement activation threshold. For example, the second functional relationship satisfies formula (5):

[0179] Y2 = f2(Θ, φ) (5)

[0180] Among them, f2 represents the second functional relationship, Θ and φ represent the input parameters of the second functional relationship, and Y2 represents the output parameter of the second functional relationship, including the rank enhancement effective mode and the rank enhancement effective threshold (the rank enhancement effective mode and the rank enhancement effective threshold shown in Table 4).

[0181] Optionally, the input parameters of the third functional relationship include multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal, and the output parameters include the rank enhancement effective mode and the rank enhancement effective threshold. For example, the third functional relationship satisfies formula (6):

[0182] Y3 = f3(Θ, φ, M, N) (6)

[0183] Among them, f3 represents the third functional relationship, Θ, φ, M, N represent the input parameters of the third functional relationship (where M is the vertical dimension of the transmit antenna and N is the horizontal dimension of the transmit antenna), and Y3 represents the output parameter of the second functional relationship, including the rank enhancement effective mode and the rank enhancement effective threshold (the rank enhancement effective mode and the rank enhancement effective threshold shown in Table 5).

[0184] In a possible implementation manner, when the first indication information is used to indicate the second information, the first indication information is used to indicate the rank enhancement effective mode and the rank enhancement effective threshold. For example, the first indication information indicates any group of threshold information (including rank enhancement effective thresholds 1 and 2) in Tables 3 to 5, and the rank enhancement effective mode corresponding to this group of threshold information. Optionally, in this implementation manner, the first indication information may indicate the indexes of the rank enhancement effective mode and the rank enhancement effective threshold; for example, the first indication information indicates the index of any group of threshold information in Tables 3 to 5, so as to indicate the rank enhancement effective mode and the rank enhancement effective threshold corresponding to this index. Optionally, in this implementation manner, the first indication information may indicate the rank enhancement effective mode, the first value, and the duration unit length; for example, the first indication information indicates any mode in Table 2, and the first value and the duration unit length (the rank enhancement effective threshold can be calculated according to the method described above), so as to indicate the corresponding rank enhancement effective mode and the rank enhancement effective threshold.

[0185] In a possible implementation, when the first indication information is used to indicate the second information, the rank enhancement activation threshold may be a channel quality indication index threshold or a modulation and coding scheme index threshold; wherein, a set of channel quality indication index thresholds or modulation and coding scheme index thresholds corresponds to a set of signal-to-noise ratio thresholds, a set of signal-to-interference-plus-noise ratio thresholds, or a set of reference signal received power thresholds. For example, in combination with the description in the protocol standard, by default, one CQI index may correspond to one SNR value; assuming a set of CQI index thresholds is 3 and 10, the SNR thresholds corresponding to this set of CQI index thresholds may be 10 and 25, that is, a set of channel quality indication index thresholds (3 and 10) corresponds to a set of signal-to-noise ratio thresholds (10 and 25). In this implementation, different from the tables 3 to 5 described above, the CQI parameter table or the MCS parameter table in the existing protocol can be referred to; the first indication information indicates the CQI index (CQI index) threshold in the CQI parameter table or the MCS index (MCS index) threshold in the MCS parameter table. For example, Table 6 is a CQI parameter table, including the CQI index and the corresponding parameters.

[0186] Table 6: CQI Parameter Table

[0187]

[0188]

[0189] Wherein, QPSK is quadrature phase shift keying, and QAM is quadrature amplitude modulation. The first indication information may indicate the CQI index threshold (the value of the CQI index in Table 6), for example, indicating that the CQI index threshold is 3 and 10, and indicating that the rank enhancement activation mode is mode 0 ([Δ1, Δ2]) in Table 2, then it can be deduced that the rank enhancement activation interval corresponding to the rank enhancement activation mode and the rank enhancement activation threshold indicated by the first indication information is [3, 10]; based on this rank enhancement activation interval, Table 6, and the first reference signal, rank enhancement channel measurement can be performed. Similarly, the MCS parameter table also includes the MCS index and MCS-related parameters. The first indication information may indicate the MCS index threshold and the rank enhancement activation mode. The specific implementation method refers to the description of CQI and will not be elaborated here. Optionally, in this implementation, the second device only needs to receive the CQI according to the CSI feedback during the measurement period of the rank enhancement channel measurement, without newly defining the rank enhancement activation mode and the rank enhancement activation threshold such as in Tables 3 to 5, which simplifies the processing flow.

[0190] In one possible implementation, the first indication information only indicates the rank enhancement activation mode. For example, assume that the first device and the second device have predefined a rank enhancement activation threshold, and assume that the rank enhancement activation threshold is only several default values (for example, for SNR, the protocol only defines two default values of 10 dB and 30 dB). Then, Table 2 can be converted into the corresponding relationship between the rank enhancement activation mode and the default rank enhancement activation threshold, as shown in Table 7.

[0191] Table 7: Corresponding relationship table between the rank enhancement activation mode and the default rank enhancement activation threshold.

[0192] Mode Type 0 [10,30] 1 [,10]∪[30,] 2 [,10] 3 [30,]

[0193] Optionally, the 4 states shown in Table 7 can be indicated by at least two bits. For example, the first indication information is used to indicate the mode of Table 7, and in combination with Table 7, the rank enhancement activation mode can be determined; or, the first indication information is used to indicate the type of Table 7, so as to directly indicate the rank enhancement activation mode. It can be seen that in this implementation, the first indication information can only indicate the rank enhancement activation mode. In combination with the preset Table 7, the first device and the second device can determine the rank enhancement activation mode and the rank enhancement activation threshold, so as to determine the rank enhancement activation interval.

[0194] Optionally, when the first device sends the first indication information to the second device, it can be sent periodically (for example, send the first indication information according to the measurement and feedback period of the rank enhancement channel measurement), or sent aperiodically (for example, after the terminal moves and the multipath angle changes, the first indication information can be resent). This application does not make a limitation.

[0195] Optionally, this application does not limit the signaling format and the bearer channel of the interaction information (such as the reference signal and the first indication information) in S101 to S103; for example, if the first device is a terminal and the second device is a base station, assume that the first reference signal is the first CSI-RS, and the first reference signal can be carried on the PDSCH; the first indication information can be an RRC message and carried on the PUSCH. It can be understood that the above example is only an example.

[0196] Optionally, this embodiment further includes the following process: The first device updates the weighting coefficient matrix of the metasurface based on the first indication information. For example, the first device confirms a rank enhancement operation based on the first indication information, and the change or update of the weighting coefficients of the metasurface can be achieved based on the following process: The first device receives at least one measurement reference signal through the metasurface, and each measurement reference signal uses a different metasurface weighting coefficient (matrix or vector). The first device measures the measurement reference signal with the maximum SNR / RSRP and other metrics, determines the metasurface weighting coefficient corresponding to the measurement reference signal, and updates the weighting coefficient matrix of the metasurface based on the metasurface weighting coefficient. Optionally, the first device can also send the metasurface weighting coefficient corresponding to the measurement reference signal to the second device.

[0197] Optionally, this embodiment further includes the following process: The first device receives a second reference signal from the second device through the metasurface; the first device performs reference signal measurement based on the second reference signal and feeds back channel state information; the first device and the second device perform data transmission, etc. For example, the first device and the second device perform channel measurement and feedback of channel state information according to the measurement period of the second reference signal. In this case, the first device does not use the identity matrix as the weighting coefficient matrix of the metasurface.

[0198] In this embodiment, the metasurface directly covers the first device or covers it in the near field with a very small spacing near the first device. The reflection characteristics of the metasurface are used to separate multiple propagation paths or improve the spatial isolation of the multiple propagation paths. Moreover, through rank enhancement channel measurement, the first device can obtain information such as multipath angle spread information and multipath angle information, and the rank enhancement effective interval can be interacted between the first device and the second device in an explicit or implicit manner (such as interacting at least one of the multipath angle spread information or the multipath angle information; or interacting information such as the rank enhancement effective mode and the rank enhancement effective threshold). Thus, based on the metasurface and the response difference to different multipath angles, the transmission rank can be improved, and the system capacity can be enhanced.

[0199] 2. The second type of communication method provided in this application (the first device includes a metasurface, the first device sends a reference signal, and the second device receives the reference signal and performs rank enhancement channel measurement and feedback):

[0200] For example, Figure 6 is a schematic flowchart of another communication method provided in this application. This method can be implemented through the interaction between the first device and the second device. For example, when the first device is a network device, the second device is a terminal; when the first device is a terminal, the second device is a network device. This method includes the following steps:

[0201] S201. The first device sends a first reference signal and a weighted coefficient matrix of the metasurface to the second device through the metasurface. Correspondingly, the second device receives the first reference signal and the weighted coefficient matrix of the metasurface from the first device.

[0202] Among them, the first device includes a metasurface. For example, the metasurface can be a layer of reflective layer attached to the antenna of the first device to achieve rank enhancement. And the first device sends the first reference signal to the second device through the metasurface, then the sent first reference signal can be transmitted to the second device through the multipath generated by the metasurface to achieve rank enhancement. Optionally, the description of the first reference signal can refer to the corresponding description in S101, which will not be elaborated here.

[0203] Optionally, the first device sends the first reference signal to the second device through the metasurface according to a preset period. Correspondingly, the second device receives the first reference signal from the first device according to a preset period. Optionally, the preset period can be the measurement period of the first reference signal. For example, assuming the first reference signal is the first CSI-RS, this preset period can be the CSI measurement period. Optionally, the measurement period of the first reference signal includes the measurement and feedback period of the first reference signal. For example, assuming the first reference signal is the first CSI-RS, the measurement period of the first reference signal includes the measurement of the first CSI-RS and the feedback period of the CSI.

[0204] It can be understood that the difference between this embodiment and Figure 3 the embodiment is that in this embodiment, the first device includes a metasurface and is the transmitter of the first reference signal; the second device is the receiver of the first reference signal. Assuming the second device does not include a metasurface, in order to implement the rank-enhanced channel measurement between the second device and the first device, the first device sends the weighted coefficient matrix of the metasurface to the second device, so that the second device can perform rank-enhanced channel measurement based on the first reference signal and the weighted coefficient matrix of the metasurface. Optionally, the weighted coefficient matrix of the metasurface can refer to the corresponding description in S102, which will not be elaborated here.

[0205] S202. The second device performs rank-enhanced channel measurement based on the first reference signal and the unit weighted coefficient matrix of the metasurface to obtain the channel measurement information between the first device and the second device.

[0206] Among them, although the second device does not include a metasurface, the second device has obtained the first reference signal and the unit weighting coefficient matrix of the metasurface attached to the first device, and can perform rank-enhanced channel measurement to obtain channel measurement information. Among them, the description of the channel measurement information can refer to the corresponding description in S102. For example, the channel measurement information includes at least one of multipath angle spread information or multipath angle information, and the description of the multipath angle spread information and the multipath angle information will not be elaborated here.

[0207] S203. The second device sends first indication information to the first device; correspondingly, the first device receives the first indication information.

[0208] Among them, the first indication information is used to indicate at least one of the first information or the second information. For the first indication information, the first information, the second information, the mapping relationship or functional relationship associated with the first information, and the specific feedback method of the first indication information can all refer to the corresponding description in S103. For example, the description of the rank enhancement effective mode, the rank enhancement effective threshold, the rank enhancement effective interval, as well as Tables 2 to 7, and the relevant descriptions such as formulas (4) to (6) can all refer to the corresponding description in S103, and will not be elaborated here.

[0209] In this embodiment, the second device is the receiving end of the first reference signal; the first device is the transmitting end of the first reference signal, and the first device includes a metasurface. The second device receives the first reference signal and the unit weighting coefficient matrix of the metasurface, and can realize rank-enhanced channel measurement based on the first reference signal, so as to feedback the rank enhancement effective interval to the first device, which is beneficial for the first device and the second device to achieve the improvement of the transmission rank and improve the system capacity.

[0210] 3. Effect analysis of the first type of communication method and the second type of communication method:

[0211] This application assumes that when performing rank-enhanced channel measurement using the first type of communication method and the second type of communication method described above, the number of multipaths is 15, the carrier frequency is 10 GHz, and the antenna element spacing of the metasurface ( Figure 7 represented by RIS here) is half a wavelength (1.5 centimeters (cm)); and it is assumed that the unit weighting coefficient matrix of the metasurface is a random complex matrix, considering multiplying different random complex matrices by different paths respectively, and assuming that the values of SNR are taken as examples of {0 dB, 30 dB}. The rank-enhanced channel measurement based on the metasurface can obtain a schematic diagram of the channel capacity as shown in Figure 7 . Among them, Figure 7 The left part of is the change line of the channel capacity measured by reflecting through the metasurface (solid line) or not reflecting through the metasurface (dashed line) when SNR = 0 dB; Figure 7The left part shows the change curve of the channel capacity measured by reflecting through the metasurface (solid line) or not reflecting through the metasurface (dashed line) when the SNR is 30 dB. Through analysis and comparison, it can be seen that through metasurface reflection and control, the transmission rank can be improved based on the response differences at different angles, thereby improving the system capacity.

[0212] It can be understood that in order to implement the functions in the above embodiments, the base station and the terminal include corresponding hardware structures and / or software modules for performing various functions. Those skilled in the art should easily realize that, combining the units and method steps of each example described in the embodiments disclosed in the present application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driving the hardware depends on the specific application scenarios and design constraints of the technical solution.

[0213] Figure 8 and Figure 9 FIG. is a schematic structural diagram of a possible communication device provided by an embodiment of the present application. These communication devices can be used to implement the functions of the first device or the second device in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments.

[0214] As Figure 8 shown, the communication device 800 includes a processing unit 810 and a communication unit 820. The communication device 800 is used to implement the functions of the first device or the second device in the above Figure 3 and Figure 6 shown method embodiments. Optionally, the communication unit 820 can also be referred to as a transceiver unit. Optionally, the transceiver unit includes a sending unit and a receiving unit, the sending unit is used to send signals, and the receiving unit is used to receive signals. Optionally, the communication device 800 further includes a storage unit 830 for storing device program codes and / or data.

[0215] (1) The communication device 800 can be the terminal-side device in the above embodiments. For example, it can be a terminal or a communication module in the terminal, or a circuit or chip responsible for the communication function in the terminal.

[0216] For example, when the communication device 800 is used to implement Figure 3When implementing the functions of the first device in the method embodiments shown: The communication unit 820 is configured to receive a first reference signal from a second device through a metasurface, and the processing unit 810 is configured to perform rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between the first device and the second device; the channel measurement information includes at least one of multipath angular spread or multipath angle. The communication unit 820 is further configured to send first indication information to the second device, and the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angular spread or multipath angle; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of multipath angular spread or multipath angle.

[0217] In a possible implementation, the metasurface is weighted using a unit weight coefficient matrix; the state of the unit weight coefficient matrix of the metasurface is the default state of the metasurface. The processing unit 810 is further configured to: determine channel measurement information based on the unit weight coefficient matrix of the metasurface and the first reference signal.

[0218] In a possible implementation, the processing unit 810 is further configured to: update the weight coefficient matrix of the metasurface based on the first indication information.

[0219] For another example, when the communication device 800 is used to implement Figure 6 When implementing the functions of the first device in the method embodiments shown: The communication unit 820 is configured to send a first reference signal and the unit weight coefficient matrix of the metasurface to the second device through the metasurface; the first reference signal and the unit weight coefficient matrix of the metasurface are used for the second device to perform rank enhancement channel measurement. The communication unit 820 is further configured to receive first indication information from the second device, and the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angular spread or multipath angle; at least one of multipath angular spread or multipath angle is obtained by the second device performing rank enhancement channel measurement based on the first reference signal; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of multipath angular spread or multipath angle.

[0220] In a possible implementation, when the first information includes at least one of multipath angular spread information or multipath angle information, the processing unit 810 is further configured to: obtain the rank enhancement activation mode and the rank enhancement activation threshold corresponding to the first information from at least one of a preset first mapping relationship, a second mapping relationship, or a third mapping relationship based on at least one of the multipath angular spread information or the multipath angle information.

[0221] In a possible implementation, when the first information includes at least one of the multipath angle spread information or the multipath angle information, the processing unit 810 is further configured to: use at least one of the multipath angle spread information or the multipath angle information as an input parameter of a function, and in combination with at least one of a preset first function relationship, a second function relationship, or a third function relationship, obtain an output parameter of the function including a rank enhancement effective mode and a rank enhancement effective threshold corresponding to the first information.

[0222] For another example, when the communication device 800 is used to implement Figure 3 the functions of the second device in the method embodiment shown: The communication unit 820 is configured to send a first reference signal to the first device. The communication unit 820 is further configured to receive first indication information from the first device, where the first indication information is used to indicate at least one of the first information or the second information; the first information includes at least one of a multipath angle spread or a multipath angle; at least one of the multipath angle spread or the multipath angle is obtained by the first device based on a rank enhancement channel measurement of the first reference signal; the second information includes a rank enhancement effective mode and a rank enhancement effective threshold, and the rank enhancement effective mode and the rank enhancement effective threshold are related to at least one of the multipath angle spread or the multipath angle.

[0223] In a possible implementation, when the first information includes at least one of the multipath angle spread information or the multipath angle information, the processing unit 810 is further configured to: based on at least one of the multipath angle spread information or the multipath angle information, obtain a rank enhancement effective mode and a rank enhancement effective threshold corresponding to the first information from at least one of a preset first mapping relationship, a second mapping relationship, or a third mapping relationship.

[0224] In a possible implementation, when the first information includes at least one of the multipath angle spread information or the multipath angle information, the processing unit 810 is further configured to: use at least one of the multipath angle spread information or the multipath angle information as an input parameter of a function, and in combination with at least one of a preset first function relationship, a second function relationship, or a third function relationship, obtain an output parameter of the function including a rank enhancement effective mode and a rank enhancement effective threshold corresponding to the first information.

[0225] For another example, when the communication device 800 is used to implement Figure 6When implementing the functions of the second device in the method embodiments shown: The communication unit 820 is configured to receive a first reference signal from the first device and a unit weight coefficient matrix of the metasurface. The processing unit 810 is configured to perform rank-enhanced channel measurement based on the first reference signal and the unit weight coefficient matrix of the metasurface, so as to obtain channel measurement information between the first device and the second device, where the channel measurement information includes at least one of multipath angle spread or multipath angle. The communication unit 820 is further configured to send first indication information to the first device, where the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread or multipath angle; the second information includes a rank-enhanced effective mode and a rank-enhanced effective threshold, and the rank-enhanced effective mode and the rank-enhanced effective threshold are related to at least one of multipath angle spread or multipath angle.

[0226] For a more detailed description of the above processing unit 810 and communication unit 820, reference may be made to the relevant descriptions in the foregoing method embodiments, and details are not described herein again.

[0227] In a possible implementation manner, when the communication device 800 is a terminal or a communication module in the terminal, the functions of the processing unit 810 may be implemented by one or more processors. Specifically, the processor may include a Modem chip, or a SoC or SIP chip including a Modem core. The functions of the communication unit 820 may be implemented by a transceiver circuit.

[0228] In a possible implementation manner, when the communication device 800 is a circuit or chip responsible for communication functions in a terminal, such as a Modem chip or a system-on-chip SoC chip or SIP chip including a Modem core, the functions of the processing unit 810 may be implemented by a circuit system including one or more processors or processor cores in the above chip. The functions of the communication unit 820 may be implemented by an interface circuit or a data transceiver circuit on the above chip.

[0229] (2) The communication device 800 may be the network-side device in the above embodiments. For example, it may be a base station or a communication module in the base station, or a circuit or chip responsible for communication functions in the base station.

[0230] For example, when the communication device 800 is used to implement Figure 3When implementing the functions of the first device in the method embodiment shown: The communication unit 820 is used to receive a first reference signal from the second device through the metasurface, and the processing unit 810 is used to perform rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between the first device and the second device; the channel measurement information includes at least one of the multipath angular spread or the multipath angle. The communication unit 820 is further used to send first indication information to the second device, and the first indication information is used to indicate at least one of the first information or the second information; the first information includes at least one of the multipath angular spread or the multipath angle; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angular spread or the multipath angle.

[0231] In a possible implementation manner, the metasurface is weighted by using a unit weighting coefficient matrix; the state of the unit weighting coefficient matrix of the metasurface is the default state of the metasurface. The processing unit 810 is further used to: determine the channel measurement information based on the unit weighting coefficient matrix of the metasurface and the first reference signal.

[0232] In a possible implementation manner, the processing unit 810 is further used to: update the weighting coefficient matrix of the metasurface based on the first indication information.

[0233] For another example, when the communication device 800 is used to implement Figure 6 When implementing the functions of the first device in the method embodiment shown: The communication unit 820 is used to send a first reference signal and the unit weighting coefficient matrix of the metasurface to the second device through the metasurface; the first reference signal and the unit weighting coefficient matrix of the metasurface are used for the second device to perform rank enhancement channel measurement. The communication unit 820 is further used to receive first indication information from the second device, and the first indication information is used to indicate at least one of the first information or the second information; the first information includes at least one of the multipath angular spread or the multipath angle; at least one of the multipath angular spread or the multipath angle is obtained by the second device performing rank enhancement channel measurement based on the first reference signal; the second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angular spread or the multipath angle.

[0234] In a possible implementation manner, when the first information includes at least one of the multipath angular spread information or the multipath angle information, the processing unit 810 is further used to: obtain the rank enhancement activation mode and the rank enhancement activation threshold corresponding to the first information from at least one of a preset first mapping relationship, a second mapping relationship, or a third mapping relationship based on at least one of the multipath angular spread information or the multipath angle information.

[0235] In a possible implementation manner, when the first information includes at least one of multipath angle spread information or multipath angle information, the processing unit 810 is further configured to: use at least one of the multipath angle spread information or the multipath angle information as an input parameter of a function, and in combination with at least one of a preset first function relationship, a second function relationship, or a third function relationship, obtain an output parameter of the function including a rank enhancement effective mode and a rank enhancement effective threshold corresponding to the first information.

[0236] For another example, when the communication device 800 is used to implement Figure 3 the functions of the second device in the method embodiment shown: The communication unit 820 is configured to send a first reference signal to the first device. The communication unit 820 is further configured to receive first indication information from the first device, where the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angle spread or multipath angle; at least one of the multipath angle spread or the multipath angle is obtained by the first device through rank enhancement channel measurement based on the first reference signal; the second information includes a rank enhancement effective mode and a rank enhancement effective threshold, and the rank enhancement effective mode and the rank enhancement effective threshold are related to at least one of the multipath angle spread or the multipath angle.

[0237] In a possible implementation manner, when the first information includes at least one of multipath angle spread information or multipath angle information, the processing unit 810 is further configured to: based on at least one of the multipath angle spread information or the multipath angle information, obtain a rank enhancement effective mode and a rank enhancement effective threshold corresponding to the first information from at least one of a preset first mapping relationship, a second mapping relationship, or a third mapping relationship.

[0238] In a possible implementation manner, when the first information includes at least one of multipath angle spread information or multipath angle information, the processing unit 810 is further configured to: use at least one of the multipath angle spread information or the multipath angle information as an input parameter of a function, and in combination with at least one of a preset first function relationship, a second function relationship, or a third function relationship, obtain an output parameter of the function including a rank enhancement effective mode and a rank enhancement effective threshold corresponding to the first information.

[0239] For another example, when the communication device 800 is used to implement Figure 6When implementing the functions of the second device in the method embodiments shown: The communication unit 820 is configured to receive a first reference signal from the first device and a unit weight coefficient matrix of the metasurface. The processing unit 810 is configured to perform rank-enhanced channel measurement based on the first reference signal and the unit weight coefficient matrix of the metasurface, and obtain channel measurement information between the first device and the second device, where the channel measurement information includes at least one of multipath angular spread or multipath angle. The communication unit 820 is further configured to send first indication information to the first device, where the first indication information is used to indicate at least one of first information or second information; the first information includes at least one of multipath angular spread or multipath angle; the second information includes a rank-enhanced effective mode and a rank-enhanced effective threshold, and the rank-enhanced effective mode and the rank-enhanced effective threshold are related to at least one of multipath angular spread or multipath angle.

[0240] For a more detailed description of the above processing unit 810 and communication unit 820, reference may be made to the relevant descriptions in the foregoing method embodiments, which will not be elaborated here.

[0241] It can be understood that the division of units in the above device is only a logical function division. Each function can correspond to a functional unit, or two or more functions can be integrated into one functional unit. In actual implementation, all or part of the units can be integrated into one physical entity, or distributed in different physical entities. In addition, the above functional units can be implemented in the form of hardware, or in the form of software, or in a combination of hardware and software. Whether a certain function is executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0242] In one example, the storage unit 830 may include a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory and / or registers, etc.

[0243] As Figure 9 shown, the communication device 900 includes a processor 910 and an interface circuit 920. The processor 910 and the interface circuit 920 are coupled to each other. It can be understood that the interface circuit 920 can be a transceiver or an input / output interface. Optionally, the transceiver includes a receiver and a transmitter. Optionally, the communication device 900 may further include a memory 930, configured to store instructions executed by the processor 910, or input data required for the processor 910 to run the instructions, or data generated after the processor 910 runs the instructions. Sometimes, the interface circuit 920 can also be understood as a part of the processor 910. In this case, the communication device 900 includes the processor 910.

[0244] When the communication device 900 is used to implement Figure 3 and Figure 6 the methods shown, the processor 910 is used to implement the functions of the above-mentioned processing unit 810, and the interface circuit 920 is used to implement the functions of the above-mentioned communication unit 820. Optionally, when the communication device 900 is used to implement Figure 3 and Figure 6 the methods shown, the implementation manners of the processor 910 and the interface circuit 920 are as described in the corresponding foregoing method embodiments, and will not be elaborated herein.

[0245] When the above communication device is a chip applied to the first device, the chip implements the functions of the first device in the above method embodiments. The chip receives information from other devices, which can be understood that the information is first received by other modules (such as a radio frequency module or an antenna) in the first device and then sent to the chip by these modules. The chip sends information to other devices, which can be understood that the information is first sent to other modules (such as a radio frequency module or an antenna) in the first device and then sent by these modules to other network elements.

[0246] When the above communication device is a chip applied to the second device, the chip implements the functions of the second device in the above method embodiments. The chip receives information from other devices, which can be understood that the information is first received by other modules (such as a radio frequency module or an antenna) in the second device and then sent to the chip by these modules. The chip sends information to other devices, which can be understood that the information is sent to other modules (such as a radio frequency module or an antenna) in the second device and then sent by these modules to other network elements.

[0247] In this application, when device A sends information to device B, it can be that A directly sends to B, or A indirectly sends to B through other devices. Similarly, when device B receives information from device A, it can be that device B directly receives the information sent by device A, or device B indirectly receives the information sent by device A through other devices. Here, device A and B can be network devices or terminals, or modules inside network devices or terminals. The sending and receiving of information can be information interaction between network devices or terminals; the sending and receiving of information can also be information interaction between two terminals; the sending and receiving of information can further be information interaction between different modules within a device, for example, information interaction between a terminal chip and other modules of the terminal.

[0248] It can be understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0249] The method steps in the embodiments of the present application may be implemented in hardware or in software instructions executable by a processor. The software instructions may be composed of corresponding software modules, and the software modules may be stored in a random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, removable hard disks, compact disc-read only memory (CD-ROM), or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. The storage medium may also be a component of the processor. The processor and the storage medium may be located in an ASIC. Additionally, the ASIC may be located in a base station or a terminal. The processor and the storage medium may also exist as discrete components in a base station or a terminal.

[0250] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are executed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable devices. The computer program or instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0251] In various embodiments of the present application, if there is no special explanation and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be cross-referenced. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0252] It can be understood that the various numerical numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The magnitude of the serial numbers of the above processes does not mean the order of execution. The order of execution of each process should be determined by its function and internal logic.

Claims

1. A communication method, characterized in that, The method includes: A first device receives a first reference signal from a second device through a metasurface; The first device performs rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between the first device and the second device; the channel measurement information includes at least one of multipath angle spread information or multipath angle information; The first device sends first indication information to the second device; the first indication information is used to indicate at least one of first information or second information; The first information includes at least one of the multipath angle spread information or multipath angle information; The second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or multipath angle information.

2. A communication method, characterized in that, The method includes: A first device sends a first reference signal and a unit weight coefficient matrix of a metasurface to a second device through the metasurface; the first reference signal and the unit weight coefficient matrix of the metasurface are used for the second device to perform rank enhancement channel measurement; The first device receives first indication information from the second device; the first indication information is used to indicate at least one of first information or second information; The first information includes at least one of multipath angle spread information or multipath angle information; at least one of the multipath angle spread information or multipath angle information is obtained by the second device performing rank enhancement channel measurement; The second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or multipath angle information.

3. The method according to claim 1 or 2, characterized in that, The first information is related to a first mapping relationship, a second mapping relationship, or a third mapping relationship; The first information includes at least one multipath angle spread information, and the first mapping relationship includes multiple rank enhancement activation modes and multiple rank enhancement activation thresholds corresponding to multiple multipath angle spread information; The first information includes at least one set of multipath angle spread information and multipath angle information, and the second mapping relationship includes multiple rank enhancement activation modes and multiple rank enhancement activation thresholds corresponding to multiple sets of multipath angle spread information and multipath angle information; The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmission antenna dimension of the first reference signal, and the third mapping relationship includes multiple rank enhancement activation modes and multiple rank enhancement activation thresholds corresponding to multiple sets of multipath angle spread information, multipath angle information, and the transmission antenna dimension of the first reference signal.

4. The method according to claim 1 or 2, characterized in that The first information is related to a first functional relationship, a second functional relationship, or a third functional relationship; The first information includes at least one multipath angle spread information, and the input parameters of the first functional relationship include multipath angle spread information, and the output parameters include a rank enhancement activation mode and a rank enhancement activation threshold; The first information includes at least one set of multipath angle spread information and multipath angle information, and the input parameters of the second functional relationship include multipath angle spread information and multipath angle information, and the output parameters include a rank enhancement activation mode and a rank enhancement activation threshold; The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal. The input parameters of the third functional relationship include the multipath angle spread information, the multipath angle information, and the transmit antenna dimension of the first reference signal, and the output parameters include a rank enhancement activation mode and a rank enhancement activation threshold.

5. The method according to claim 1 or 2, characterized in that, The rank enhancement activation threshold includes a channel quality indicator index threshold or a modulation and coding scheme index threshold; Wherein, a set of channel quality indicator index thresholds or modulation and coding scheme index thresholds corresponds to a set of signal-to-noise ratio thresholds, a set of signal-to-interference-plus-noise ratio thresholds, or a set of reference signal received power thresholds.

6. The method according to any one of claims 1 to 5, characterized in that, The rank enhancement activation mode is used to indicate whether the rank enhancement activation interval is an open interval or a closed interval; the rank enhancement activation mode is indicated by at least two bits.

7. The method according to claim 6, characterized in that, The rank enhancement activation threshold includes at least one of the maximum value or the minimum value of the rank enhancement activation interval; or, The rank enhancement activation threshold includes a first value and a duration unit length, and the first value and the duration unit length are used to determine at least one of the maximum value or the minimum value of the rank enhancement activation interval.

8. The method according to claim 1, characterized in that, The first device performs rank enhancement channel measurement based on the first reference signal to obtain channel measurement information between the first device and the second device, including: The first device determines the channel measurement information based on the unit weight coefficient matrix of the metasurface and the first reference signal.

9. The method according to claim 8, wherein The method further includes: The first device updates the weight coefficient matrix of the metasurface based on the first indication information.

10. The method according to claim 1, characterized in that, The measurement period of the rank enhancement channel measurement is determined based on the change state of the multipath angle; The measurement period of the rank enhancement channel measurement is greater than or equal to the measurement period of the second reference signal; the signal type of the second reference signal is the same as or different from the signal type of the first reference signal.

11. A communication method, characterized in that, The method includes: The second device sends a first reference signal to the first device; The second device receives first indication information from the first device, and the first indication information is used to indicate at least one of the first information or the second information; The first information includes at least one of the multipath angle spread information or the multipath angle information; at least one of the multipath angle spread information or the multipath angle information is obtained by the first device performing rank enhancement channel measurement based on the first reference signal; The second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information.

12. A communication method, characterized in that, The method includes: The second device receives the first reference signal and the unit weight coefficient matrix of the metasurface from the first device; The second device performs rank enhancement channel measurement based on the first reference signal and the unit weight coefficient matrix of the metasurface to obtain channel measurement information between the first device and the second device; the channel measurement information includes at least one of the multipath angle spread information or the multipath angle information; The second device sends first indication information to the first device, and the first indication information is used to indicate at least one of the first information or the second information; The first information includes at least one of multipath angle spread information or multipath angle information; The second information includes a rank enhancement activation mode and a rank enhancement activation threshold, and the rank enhancement activation mode and the rank enhancement activation threshold are related to at least one of the multipath angle spread information or the multipath angle information.

13. The method according to claim 11 or 12, characterized in that, The first information is related to a first mapping relationship, a second mapping relationship, or a third mapping relationship; The first information includes at least one multipath angle spread information, and the first mapping relationship includes a plurality of rank enhancement activation modes and a plurality of rank enhancement activation thresholds corresponding to the plurality of multipath angle spread information; The first information includes at least one set of multipath angle spread information and multipath angle information, and the second mapping relationship includes a plurality of rank enhancement activation modes and a plurality of rank enhancement activation thresholds corresponding to the at least one set of multipath angle spread information and multipath angle information; The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal, and the third mapping relationship includes a plurality of rank enhancement activation modes and a plurality of rank enhancement activation thresholds corresponding to the at least one set of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal; 14. The method according to claim 11 or 12, characterized in that, The first information is related to a first functional relationship, a second functional relationship, or a third functional relationship; The first information includes at least one multipath angle spread information, and the input parameters of the first functional relationship include the multipath angle spread information, and the output parameters include a rank enhancement activation mode and a rank enhancement activation threshold; The first information includes at least one set of multipath angle spread information and multipath angle information, and the input parameters of the second functional relationship include the multipath angle spread information and the multipath angle information, and the output parameters include a rank enhancement activation mode and a rank enhancement activation threshold; The first information includes at least one set of multipath angle spread information, multipath angle information, and the transmit antenna dimension of the first reference signal, and the input parameters of the third functional relationship include the multipath angle spread information, the multipath angle information, and the transmit antenna dimension of the first reference signal, and the output parameters include a rank enhancement activation mode and a rank enhancement activation threshold.

15. The method according to claim 11 or 12, characterized in that, The rank enhancement activation threshold includes a channel quality indicator index threshold or a modulation and coding scheme index threshold; Wherein, a set of channel quality indicator index thresholds or modulation and coding scheme index thresholds corresponds to a set of signal-to-noise ratio thresholds, a set of signal-to-interference-plus-noise ratio thresholds, or a set of reference signal received power thresholds.

16. The method according to any one of claims 11 to 15, characterized in that, The rank enhancement activation mode is used to indicate whether the rank enhancement activation interval is an open interval or a closed interval; the rank enhancement activation mode is indicated by at least two bits.

17. The method according to claim 16, wherein The rank enhancement activation threshold includes at least one of the maximum value or the minimum value of the rank enhancement activation interval; or, The rank enhancement activation threshold includes a first value and a duration unit length, and the first value and the duration unit length are used to determine at least one of the maximum value or the minimum value of the rank enhancement activation interval.

18. The method according to claim 12, characterized in that The measurement period for performing rank enhancement channel measurement based on the first reference signal is determined based on the change state of the multipath angle; The measurement period of the rank-enhanced channel measurement is greater than or equal to the measurement period of the second reference signal; the signal type of the second reference signal is the same as or different from the signal type of the first reference signal.

19. A communication device, characterized in that, Comprising a module or unit for performing the method according to any one of claims 1 to 10.

20. A communication device, characterized in that, Comprising a module or unit for performing the method according to any one of claims 11 to 18.

21. A communication device, characterized in that, Comprising a memory and one or more processors, the memory for storing a computer program; the one or more processors for executing the computer program in the memory, such that the communication device performs the method according to any one of claims 1 to 10.

22. A communication device, characterized in that, Comprising a memory and one or more processors, the memory for storing a computer program; the one or more processors for executing the computer program in the memory, such that the communication device performs the method according to any one of claims 11 to 18.

23. A communication system, characterized in that, The communication system comprises a communication device according to claim 19 or 21, and a communication device according to claim 20 or 22.

24. A computer-readable storage medium, characterized in that, A computer program or instruction is stored in the computer-readable storage medium, and when the computer program or instruction is executed by a computer, the method according to any one of claims 1 to 10 or claims 11 to 18 is implemented.

25. A chip, characterized in that, The chip comprises a processor, and the processor is used for executing a computer program, such that the chip implements the method according to any one of claims 1 to 10 or claims 11 to 18.

26. A chip system, characterized in that, The chip system comprises a processor and an interface, and the processor is used for executing a computer program, such that the chip system implements the method according to any one of claims 1 to 10 or claims 11 to 18.

27. A computer program product, characterized in that, Comprising instructions, and when the instructions run on a computer, the computer is caused to execute the method according to any one of claims 1 to 10 or claims 11 to 18.

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