Cascade channel information acquisition method and device

Abstract

The invention provides a channel information acquisition method and device of a cascade channel, and relates to the technical field of communication. The method comprises the following steps: the network equipment sends first measurement configuration information to an intelligent reflector (RIS) according to a first regulation and control matrix of the RIS; the network equipment sends a first measurement signal to the RIS; wherein the first measurement signal is used for the terminal to measure state information of a cascade channel between the network device and the terminal; the first measurement configuration information is used for configuring the RIS to forward the first measurement signal to the terminal by adopting the first regulation and control matrix after receiving the first measurement signal. According to the scheme of the invention, the problems of large measurement overhead and high complexity of the existing scheme are solved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method and device for acquiring channel information of a cascade channel. Background Art

[0002] In wireless communication systems built on Reconfigurable Intelligence Surface (RIS), channel information is not only used to determine scheduling information, beamforming and precoding matrix, but also to control the state of RIS. As the array size increases, the complexity and overhead of channel estimation and CSI feedback also increase, and the passive characteristics of RIS further increase the complexity of channel information acquisition.

[0003] In such Figure 1 In the wireless communication system based on RIS, the channel between the base station and the user equipment (UE) includes two channels: base station-RIS and RIS-UE. In the wireless communication system based on RIS, the phase shift matrix of RIS can be determined by beam scanning, and then channel measurement is performed under the determined RIS phase shift matrix to obtain channel estimation.

[0004] However, this channel information acquisition method based on beam scanning requires not only the determination of the analog shaping on the base station side, but also the determination of the phase shift matrix on the RIS side, that is, the shaping at the RIS. As a result, the beam measurement overhead required by this method is relatively large, and as the frequency band increases, the scale of the RIS increases, the RIS beam becomes narrower, and the number of beams required to cover the service area increases, the demand for measurement overhead and time will also increase, and the difficulty of channel information acquisition will increase significantly. Summary of the invention

[0005] The purpose of the present application is to provide a method and device for acquiring channel information of a cascaded channel, which can solve the problem that the existing solution has large measurement overhead and high complexity.

[0006] In order to achieve the above object, an embodiment of the present application provides a method for acquiring channel information of a cascade channel, comprising:

[0007] The network device sends first measurement configuration information to the intelligent reflecting surface RIS according to a first control matrix of the RIS;

[0008] The network device sends a first measurement signal to the RIS;

[0009] Among them, the first measurement signal is used by the terminal to measure the state information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

[0010] Optionally, the method further comprises:

[0011] The network device obtains a first control matrix of the intelligent reflecting surface RIS.

[0012] Optionally, the method further comprises:

[0013] The network device receives first channel information fed back by the terminal, where the first channel information is state information of a channel between the RIS and the terminal;

[0014] The network device obtains a first control matrix of a smart reflective surface RIS, including:

[0015] The network device determines the first control matrix according to the first channel information; or,

[0016] The network device determines a candidate control matrix according to the first channel information, and selects any control matrix from the candidate control matrices as the first control matrix.

[0017] Optionally, the network device obtains a first control matrix of a smart reflective surface RIS, including:

[0018] The network device receives the first control matrix sent by the terminal; or,

[0019] The network device receives the candidate control matrix sent by the terminal, and selects any control matrix among the candidate control matrix as the first control matrix.

[0020] Optionally, the method further comprises:

[0021] The network device sends second measurement configuration information to the RIS, where the second measurement configuration information is used to instruct the RIS to send a second measurement signal, where the second measurement signal is used by the terminal to measure state information of a channel between the RIS and the terminal.

[0022] Optionally, the method further comprises:

[0023] The network device receives the second channel information and / or the third channel information fed back by the terminal;

[0024] The second channel information is state information of a cascade channel between the network device and the terminal;

[0025] The third channel information is status information of a channel between the network device and the RIS.

[0026] Optionally, the method further comprises:

[0027] After receiving the second channel information, the network device determines the third channel information according to the second channel information, the first control matrix and the first channel information.

[0028] Optionally, after receiving the second channel information, the network device determines the third channel information according to the second channel information, the first control matrix and the first channel information, including:

[0029] Calculate the third channel information by the formula H=H2φH1;

[0030] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0031] Optionally, the method further comprises:

[0032] The network device updates the first control matrix based on the second channel information, the third channel information, and the candidate control matrix so that at least one of the following satisfies a first preset condition:

[0033] Received signal power;

[0034] Letter drying ratio.

[0035] Optionally, the network device determines the first control matrix according to the first channel information, including:

[0036] The network device determines a sending direction of a received signal based on the first channel information, and determines the first control matrix based on the sending direction; or,

[0037] The network device determines the first control matrix based on the first channel information so that at least one of the following satisfies a second preset condition:

[0038] Received signal power;

[0039] Signal-to-noise ratio.

[0040] In order to achieve the above object, an embodiment of the present application provides a method for acquiring channel information of a cascade channel, comprising:

[0041] The terminal sends at least one of the following to the network device:

[0042] Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal;

[0043] The third channel information is the status information of the channel between the network device and the RIS.

[0044] Optionally, the method further comprises:

[0045] The terminal performs measurement according to a received second measurement signal to determine first channel information, where the second measurement signal is sent by the RIS.

[0046] Optionally, the method further comprises:

[0047] The terminal sends the first channel information to the network device.

[0048] Optionally, the method further comprises:

[0049] The terminal determines a first control matrix according to the first channel information, and sends the first control matrix to the network device; or,

[0050] The terminal determines a candidate control matrix according to the first channel information, and sends the candidate control matrix to the network device; or,

[0051] The terminal determines a candidate control matrix according to the first channel information, selects any control matrix from the candidate control matrices as the first control matrix, and sends the first control matrix to the network device.

[0052] Optionally, the method further comprises:

[0053] The terminal performs measurement according to a received first measurement signal to determine second channel information, where the first measurement signal is sent by the network device.

[0054] Optionally, the method further comprises:

[0055] The terminal determines the third channel information according to the second channel information, the first control matrix and the first channel information.

[0056] Optionally, the terminal determines the third channel information according to the second channel information, the first control matrix and the first channel information, including:

[0057] Calculate the third channel information by the formula H=H2φH1;

[0058] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0059] Optionally, the method further comprises:

[0060] The terminal updates the first control matrix based on the second channel information, the third channel information and the candidate control matrix so that at least one of the following satisfies a first preset condition:

[0061] Received signal power;

[0062] Letter drying ratio.

[0063] Optionally, the terminal determines a first control matrix according to the first channel information, including:

[0064] The terminal determines a sending direction of a received signal based on the first channel information, and determines the first control matrix based on the sending direction; or,

[0065] The terminal determines the first control matrix based on the first channel information so that at least one of the following satisfies a second preset condition:

[0066] Received signal power;

[0067] Signal-to-noise ratio.

[0068] In order to achieve the above object, an embodiment of the present application provides a method for acquiring channel information of a cascade channel, comprising:

[0069] The RIS receives first measurement configuration information sent by the network device, where the first measurement configuration information carries a first control matrix;

[0070] After receiving the first measurement signal sent by the network device, the RIS forwards the first measurement signal to the terminal according to the first control matrix;

[0071] The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

[0072] Optionally, the method further comprises:

[0073] The RIS receives second measurement configuration information sent by the network device;

[0074] The RIS sends a second measurement signal to the terminal according to the second measurement configuration information;

[0075] The second measurement signal is used by the terminal to measure the state information of the channel between the RIS and the terminal.

[0076] In order to achieve the above-mentioned purpose, an embodiment of the present application provides a channel information acquisition device of a cascade channel, including: a memory, a transceiver, and a processor;

[0077] A memory for storing program instructions; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading program instructions in the memory;

[0078] The transceiver performs the following operations:

[0079] sending first measurement configuration information to the RIS according to a first control matrix of the RIS;

[0080] sending a first measurement signal to the RIS;

[0081] The first measurement signal is used by the terminal to measure the status information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

[0082] In order to achieve the above object, an embodiment of the present application provides a channel information acquisition device for a cascade channel, including:

[0083] A first sending module, configured to send first measurement configuration information to the RIS according to a first control matrix of the RIS;

[0084] A second sending module, used for sending a first measurement signal to the RIS;

[0085] The first measurement signal is used by the terminal to measure the status information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

[0086] In order to achieve the above-mentioned purpose, an embodiment of the present application provides a channel information acquisition device of a cascade channel, including: a memory, a transceiver, and a processor;

[0087] A memory for storing program instructions; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading program instructions in the memory;

[0088] The transceiver performs the following operations:

[0089] Send at least one of the following to the network device:

[0090] Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal;

[0091] The third channel information is the status information of the channel between the network device and the RIS.

[0092] In order to achieve the above object, an embodiment of the present application provides a channel information acquisition device for a cascade channel, including:

[0093] The third sending module is used to send at least one of the following to the network device:

[0094] Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal;

[0095] The third channel information is the status information of the channel between the network device and the RIS.

[0096] In order to achieve the above-mentioned purpose, an embodiment of the present application provides a channel information acquisition device of a cascade channel, including: a memory, a transceiver, and a processor;

[0097] A memory for storing program instructions; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading program instructions in the memory;

[0098] The transceiver performs the following operations:

[0099] Receiving first measurement configuration information sent by a network device, where the first measurement configuration information carries a first control matrix;

[0100] After receiving the first measurement signal sent by the network device, forwarding the first measurement signal to the terminal according to the first control matrix;

[0101] The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

[0102] In order to achieve the above object, an embodiment of the present application provides a channel information acquisition device for a cascade channel, including:

[0103] A first configuration receiving module, configured to receive a first measurement configuration sent by a network device, wherein the first measurement configuration carries a first control matrix;

[0104] a measurement signal forwarding module, configured to receive a first measurement signal sent by the network device and forward the first measurement signal to a terminal according to the first control matrix;

[0105] The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

[0106] In order to achieve the above-mentioned purpose, an embodiment of the present application further provides a processor-readable storage medium, wherein the processor-readable storage medium stores program instructions, and the program instructions are used to enable the processor to execute the channel information acquisition method of the cascaded channel as described above.

[0107] The above technical solution of the present application has at least the following beneficial effects:

[0108] In the above technical solution of the embodiment of the present application, the network device will send the first control matrix to the RIS through the first measurement configuration information, and the network device will also send the first measurement signal to the RIS, so that after the RIS receives the first measurement signal, it can use the first control matrix to forward the first measurement signal to the terminal, so that the terminal receives the first measurement signal to measure and obtain the state information of the cascade channel between the network device and the terminal, reducing the measurement overhead and complexity, and realizing efficient and accurate channel information acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0109] Figure 1 A wireless communication system based on RIS;

[0110] Figure 2 This is one of the flowcharts of the method of the embodiment of the present application;

[0111] Figure 3 This is a schematic diagram of RIS;

[0112] Figure 4 This is a second flow chart of the method of the embodiment of the present application;

[0113] Figure 5 This is a third flow chart of the method of the embodiment of the present application;

[0114] Figure 6 This is one of the structural block diagrams of the device according to the embodiment of the present application;

[0115] Figure 7 This is one of the module schematic diagrams of the device according to the embodiment of the present application;

[0116] Figure 8 This is the second structural block diagram of the device according to the embodiment of the present application;

[0117] Fig. 9 This is the second module schematic diagram of the device according to the embodiment of the present application;

[0118] Fig.10 This is the third module schematic diagram of the device according to the embodiment of the present application. DETAILED DESCRIPTION

[0119] In the embodiments of the present application, the term "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0120] In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0121] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0122] The following is a description of the contents involved in this application:

[0123] In wireless communication systems built on RIS, channel information is not only used to determine scheduling information, beamforming and precoding matrix, but also to control the state of RIS. As the array size increases, the complexity and overhead of channel estimation and channel state information (CSI) feedback also increase, and the passive characteristics of RIS further increase the complexity of channel information acquisition.

[0124] In such Figure 1 In the wireless communication system based on RIS, the channel between the base station and the UE includes two channels: base station-RIS and RIS-UE. In order to adjust the state of RIS, the most ideal way is to obtain the channel state of the RIS-UE channel and determine the state of RIS based on the channel state of the channel. In order to obtain the beamforming and precoding matrix of the transmitter on the base station side, it is necessary to obtain the channel information between the base station and RIS or the base station to the UE.

[0125] The beamforming scheme under the existing digital-analog hybrid beamforming architecture is to first determine the analog beamforming, and then perform channel estimation to obtain digital beamforming based on the fixed analog beamforming. In the communication system after adding RIS, the phase shift matrix of RIS can also be determined by beam scanning, and then channel measurement is performed under the determined RIS phase shift matrix to obtain channel estimation for beamforming on the base station side. During the channel information acquisition process, the phase shift matrix of RIS remains unchanged until the base station sends the physical downlink shared channel (PDSCH) based on the channel information fed back by the UE. Assume that the base station has M beams, the RIS has L beams (assuming that the number of RIS transmit and receive beams is the same), and the UE has N beams. Then the radio connection from the base station to the UE has a total of M*L*L*N TX-RX beam pairs. The beam measurement overhead required for this method is relatively large. As the frequency band increases, the scale of RIS increases, the RIS beam becomes narrower, and the number of beams required to cover the service area increases. The demand and time for measurement overhead will also increase, and the difficulty of channel information acquisition will increase significantly.

[0126] It should be noted that, in this embodiment, the channel information is channel state information.

[0127] The embodiment of the present application provides a method and device for acquiring channel information of a cascade channel. The method and device are based on the same application concept. Since the method and device solve the problem in a similar principle, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0128] like Figure 2 As shown, a method for obtaining channel information of a cascade channel provided in an embodiment of the present application includes:

[0129] Step 201: The network device sends first measurement configuration information to the smart reflecting surface RIS according to a first control matrix of the smart reflecting surface RIS.

[0130] The first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using a first control matrix after receiving the first measurement signal. The first measurement configuration information carries the first control matrix. The first control matrix is ​​the RIS control matrix, which corresponds to the RIS transceiver beam pair. Determining the first control matrix determines the RIS transceiver beam pair.

[0131] Step 202, the network device sends a first measurement signal to the RIS;

[0132] The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

[0133] Thus, according to step 201 and step 202, the network device will send the first control matrix to the RIS through the first measurement configuration information, and the network device will also send the first measurement signal to the RIS, so that after the RIS receives the first measurement signal, it can use the first control matrix to forward the first measurement signal to the terminal, so that the terminal receives the first measurement signal to measure and obtain the state information of the cascade channel between the network device and the terminal, thereby reducing the measurement overhead and complexity, and realizing efficient and accurate channel information acquisition.

[0134] In some embodiments, the cascade channel between the network device and the terminal can also be understood as an equivalent channel between the network device and the terminal.

[0135] In some embodiments, the first measurement signal is also referred to as a base station measurement signal.

[0136] Optionally, the method further comprises:

[0137] The network device obtains a first control matrix of the intelligent reflecting surface RIS.

[0138] Here, the first control matrix may be determined by the terminal and sent to the network device, or may be determined autonomously by the network device.

[0139] Optionally, the method further comprises:

[0140] The network device receives first channel information fed back by the terminal, where the first channel information is state information of a channel between the RIS and the terminal;

[0141] The network device obtains a first control matrix of a smart reflective surface RIS, including:

[0142] The network device determines the first control matrix according to the first channel information; or,

[0143] The network device determines a candidate control matrix according to the first channel information, and selects any control matrix from the candidate control matrices as the first control matrix.

[0144] The state information of the channel between the RIS and the UE is recorded as H2, that is, the first channel information H2. In this way, the network device will directly use H2 to determine the control matrix φ0 by receiving the H2 obtained by the UE through channel measurement, and use it as the first control matrix; or first use H2 to determine the candidate control matrix, and multiple candidate control matrices (also called candidate beam control matrices) can be regarded as a candidate control matrix set Φ = {φ1,…,φ n}, then select any control matrix φ from the candidate control matrix i, i=1,…,n is used as the first control matrix. The value of n may be preset or determined according to the number of determined candidate control matrices.

[0145] Among them, the network device can select the first control matrix from the determined candidate control matrices by random selection or other predefined methods, which are not listed here one by one.

[0146] The network device determines the first control matrix according to the first channel information, including:

[0147] The network device determines a sending direction of a received signal based on the first channel information, and determines the first control matrix based on the sending direction; or,

[0148] The network device determines the first control matrix based on the first channel information so that at least one of the following satisfies a second preset condition:

[0149] Received signal power;

[0150] Signal-to-noise ratio.

[0151] That is to say, after receiving the first channel information, the network device can determine the sending direction of the second measurement signal from the first channel information, and thus determine the first control matrix through the sending direction. Each RIS transceiver beam pair corresponds to a RIS control matrix. The RIS transceiver beam pair is a combination of a RIS transmit beam and a RIS receive beam. When the sending direction of the second measurement signal is known, the corresponding RIS transceiver beam pair can be known. Then, through the correspondence between the RIS transceiver beam and the RIS control matrix, the RIS control matrix corresponding to the known RIS transceiver beam pair can be determined, that is, the first control matrix.

[0152] On the other hand, a first control matrix is ​​determined based on the first channel information, and the determined first control matrix can make the received signal power and / or signal-to-noise ratio meet the second preset condition. Among them, for the received signal power, the second preset condition can be that the received signal power is greater than the first threshold, or, under a specific constraint (such as the transmitter power consumption is less than the set power consumption), the received signal power is greater than the first threshold; for the signal-to-noise ratio, the second preset condition can be that the signal-to-noise ratio is greater than the second threshold. Each threshold in the second preset condition can be pre-set.

[0153] Assuming that the first threshold is set in advance so that the received signal power is greater than the first threshold, the norm of the product of the control matrix of each RIS and H2 can be calculated, and the fact that the norm is greater than the first threshold indicates that the received signal power is greater than the first threshold. For example, a RIS array has M RIS transceiver beam pairs, each RIS transceiver beam pair corresponds to a RIS control matrix, and the RIS transceiver beam pair is a combination of a RIS transmit beam and a RIS receive beam. The RIS control matrix is ​​a quantized matrix, and the control matrix of the RIS corresponding to the M RIS transceiver beam pairs is {φ1,…,φ M}. RIS is a partially active array, and the process of determining the first control matrix according to H2 is as follows:

[0154] calculate

[0155] f(φ i )=||H2φ i ||, i=1,…,M chooses f(φ i ) is greater than the first threshold φ i As the first control matrix. In a possible implementation, the first control matrix is ​​such that f(φ i )The largest φ i .

[0156] In addition, the signal-to-noise ratio is greater than the second threshold, and similar reference can also be made to f(φ i ) is calculated, and the first control matrix is ​​determined by calculating other parameters to achieve the goal of making the signal-to-noise ratio greater than the second threshold.

[0157] In some embodiments, the network device determines the candidate control matrix in a manner similar to determining the first control matrix. For example, in the above example, f(φ i ), then choose f(φ i ) is greater than the first threshold value of multiple φ i as a candidate regulatory matrix.

[0158] In some embodiments, after performing channel measurement to obtain H2, the UE directly uses H2 to determine the control matrix φ0 and uses it as the first control matrix; or, uses H2 to determine the candidate control matrix, and multiple candidate control matrices can be regarded as a candidate control matrix set Φ = {φ1, ..., φ n}; or, after determining the candidate control matrix using H2, select any control matrix φ from the candidate control matrix i, i = 1,…, n as the first control matrix. Wherein, the value of n can be pre-set, and can be determined according to the number of determined candidate control matrices. Wherein, the UE can also select the first control matrix from the determined candidate control matrices by random selection or other predefined methods, which are not listed here one by one. In this way, the UE will send the first control matrix or the candidate control matrix to the network device. Therefore, optionally, the network device obtains the first control matrix of the intelligent reflection surface RIS, including:

[0159] The network device receives the first control matrix sent by the terminal; or,

[0160] The network device receives the candidate control matrix sent by the terminal, and selects any control matrix among the candidate control matrix as the first control matrix.

[0161] It should be known that the way in which the network device determines the first control matrix is ​​also applicable to the terminal determining the first control matrix, and the way in which the network device determines the candidate control matrix is ​​also applicable to the terminal determining the candidate control matrix, which will not be repeated here.

[0162] Optionally, the method further comprises:

[0163] The network device sends second measurement configuration information to the RIS, where the second measurement configuration information is used to instruct the RIS to send a second measurement signal, where the second measurement signal is used by the terminal to measure state information of a channel between the RIS and the terminal.

[0164] That is, the network device configures the RIS to send the second measurement signal through the second measurement configuration information, so that the UE can obtain the first channel information based on the received second measurement signal.

[0165] In some embodiments, the second measurement configuration information includes a control matrix of a RIS configured by the network device.

[0166] In some embodiments, the second measurement signal is also referred to as a RIS measurement signal.

[0167] In some embodiments, the subarrays of the RIS array (RIS array) are independently controlled and can be switched on and off independently. The subarrays have a simple signal transmission function and send a measurement signal for RIS-UE segment channel measurement, that is, a second measurement signal. The UE independently measures the subarray to obtain channel information corresponding to the subarray, and then obtains channel information corresponding to the complete RIS array, that is, first channel information, by performing spatial domain interpolation on the channel information corresponding to multiple subarrays.

[0168] In some embodiments, the RIS array may be equipped with a control node, and the control node has a simple signal transmission function. One possibility is that the control node and the RIS array are QCL, and the control node transmits a RIS measurement signal, that is, a second measurement signal, and the UE receives the second measurement signal to obtain channel information of the RIS-UE segment, that is, the first channel information.

[0169] Optionally, after the network device sends the first measurement signal, the terminal can obtain the second channel information based on the received first measurement signal. Furthermore, the terminal feeds back the second channel information to the network device so that the network device determines the third channel information; the terminal can also autonomously determine the third channel information based on the second channel information, and then feed back the third channel information to the network device. In other words, the terminal will perform at least one of the following: feed back the second channel information to the network device; feed back the third channel information to the network device. Therefore, correspondingly, the method also includes:

[0170] The network device receives the second channel information and / or the third channel information fed back by the terminal;

[0171] The second channel information is state information of a cascade channel between the network device and the terminal;

[0172] The third channel information is status information of a channel between the network device and the RIS.

[0173] The state information of the channel between the network device and the UE is recorded as H, that is, the second channel information H; the state information of the channel between the network device and the RIS is recorded as H1, that is, the third channel information H1.

[0174] Optionally, the method further comprises:

[0175] After receiving the second channel information, the network device determines the third channel information according to the second channel information, the first control matrix and the first channel information.

[0176] In the scenario where the terminal feeds back the second channel information, after receiving H, the network device will determine H1 by combining H, the first control matrix φ and H2.

[0177] Optionally, after receiving the second channel information, the network device determines the third channel information according to the second channel information, the first control matrix and the first channel information, including:

[0178] Calculate the third channel information by the formula H=H2φH1;

[0179] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0180] In this way, by measuring the channels of the RIS-UE segment and the cascaded channels of the network device-RIS-UE in stages, the channels from the network device to the RIS and from the RIS to the UE are decoupled, and efficient and accurate channel information acquisition is achieved with low measurement overhead and complexity to meet system performance requirements.

[0181] Optionally, the method further comprises:

[0182] The network device updates the first control matrix based on the second channel information, the third channel information, and the candidate control matrix so that at least one of the following satisfies a first preset condition:

[0183] Received signal power;

[0184] Letter drying ratio.

[0185] That is to say, after determining the third channel information, the network device can also update the first control matrix, and the updated first control matrix can make the received signal power and / or signal to interference and noise ratio meet the first preset condition.

[0186] Among them, for the received signal power, the first preset condition is that the received signal power is greater than the third threshold, or, under a specific constraint (such as the transmitter power consumption is less than the set power consumption), the received signal power is greater than the third threshold; for the signal to interference noise ratio, the first preset condition may be that the signal to interference noise ratio is greater than the fourth threshold. Each threshold in the first preset condition may be pre-set.

[0187] Assuming that the third threshold is preset so that the received signal power is greater than the third threshold, the norm of the product of the control matrix of each RIS and H1 and H2 can be calculated, and the fact that the norm is greater than the third threshold indicates that the received signal power is greater than the third threshold. For example, the set of candidate control matrices of RIS is Φ = {φ1, ..., φ4}.

[0188] The process of updating the first control matrix according to H1 and H2 is as follows:

[0189] For example, substitute H1 and H2, and Φ={φ1,…,φ4} into the formula

[0190] H=H2φH1

[0191] get

[0192]

[0193] Compare Select so that RIS control matrix φ greater than the third threshold i As the control matrix of RIS, that is, the updated first control matrix. In a possible implementation, the updated first control matrix is ​​such that The largest φ i .

[0194] For example, the trace of the product of the control matrix of each RIS and H1 and H2 is calculated: tr(H2φ i H1), i = 1,…,4, the transmitter power consumption is represented by the trace;

[0195] And, calculate the norm of the product of each RIS's control matrix and H1 and H2, ||H2φ i H1||, i = 1, ..., 4, the received signal power is represented by the norm;

[0196] According to the first preset condition, select the φ that meets the requirements i As the RIS control matrix, that is, the updated first control matrix. Among them, the first preset condition is: ||H2φ i H1|| satisfies a certain threshold, and tr(H2φ i H1) Smallest φ i ; or, ||H2φ i H1|| is the largest, and tr(H2φ i H1) φ that satisfies a certain threshold i .

[0197] In some embodiments, the network device determines the first control matrix in the following manner:

[0198] Assume that the channel information H2 of the RIS-UE segment is obtained by the method in Example 1. The process of determining the RIS candidate beam steering matrix according to H2 is as follows:

[0199] calculate

[0200] f(φ i )=||H2φ i ||,i=1,…,M

[0201] Choose such that f(φ i ) satisfies one or more φ i As a candidate regulatory matrix for RIS.

[0202] In some embodiments, taking the determination of H1 by the base station as an example, the base station configures the RIS with second measurement configuration information (RIS measurement information). The RIS sends a RIS measurement signal according to the base station configuration. The UE receives the RIS measurement signal and performs measurement to obtain the channel information H2 of the RIS-UE segment. The UE reports the channel information H2 of the RIS-UE segment to the base station. The base station receives the channel information H2 of the RIS-UE segment reported by the UE. The base station determines the candidate control matrix φ0 of the RIS or the candidate control matrix set Φ={φ1,…,φ n The base station transmits a base station measurement signal, and configures the control matrix of the RIS to be a candidate control matrix φ0 or a candidate control matrix set Φ={φ1,…,φ n A candidate control matrix φ in i ,i=1,…,n. RIS switches the control matrix according to the base station configuration and forwards the base station measurement signal. UE receives the base station measurement signal forwarded by RIS and performs measurement to obtain the equivalent channel information H=H2φH1 of the BS-RIS-UE cascade channel. UE reports the channel information H of the BS-RIS-UE cascade channel to the base station. The base station receives the equivalent channel information H (H=H2φ0H1 or H=H2φ0H1) of the BS-RIS-UE cascade channel reported by the UE. i H1). The base station calculates the i , i = 1, ..., n, and channel information H2 and H to obtain the channel information H1 of the BS-RIS segment. Optional: The base station obtains the channel information H1 and H2 and the RIS candidate control matrix set Φ = {φ1, ..., φ n}, correct the RIS control matrix configuration.

[0203] Scenario 1: Assume that the RIS sub-arrays are individually controlled and can be switched on and off independently. Divide the RIS array into 5×9 RIS sub-arrays, such as Figure 3 As shown in the figure, the six black sub-arrays have a simple signal transmission function and send measurement signals for RIS-UE segment channel measurement. By independently measuring the six sub-arrays highlighted in blue in the figure, the channel information corresponding to the six sub-arrays is obtained. Then, the channel information corresponding to the complete RIS array is obtained by performing spatial interpolation on the six sub-arrays.

[0204] according to Figure 1 For the link shown, the signal reflected by RIS received by UE is:

[0205] y=H2φH1x+n

[0206] Among them, x is the signal sent by the base station, H1 is the BS-RIS segment channel information, H2 is the RIS-UE segment channel information, and φ is the RIS control matrix.

[0207] When the UE receives a signal sent by the RIS, the signal can be expressed as

[0208] y′=H2s+n

[0209] The whole process of channel information acquisition is as follows:

[0210] 1. RIS-UE channel information acquisition stage:

[0211] Step 1: Open Figure 3 The transmitting module of one of the highlighted RIS sub-arrays of the RIS array shown in FIG. 1 is used to turn off the transmitting modules of other sub-arrays and transmit the RIS measurement signal.

[0212] Step 2: The UE receives the RIS measurement signal and obtains the channel information h1 of the RIS-UE segment of the highlighted RIS subarray.

[0213] Step 3: Switch on the next highlighted RIS sub-array transmit module, turn off the transmit modules of other sub-arrays, and loop through the measurement process of step 1 to step 2, complete the channel measurement of the RIS-UE segments of the six sub-arrays one by one, and obtain the channel information h1, h2, …, h6 of the six RIS sub-arrays.

[0214] Step 4: The UE obtains the channel information H2 from the complete RIS array to the UE through spatial interpolation, and reports the information to the base station.

[0215] Step 5: The base station receives the RIS-UE channel information H2 reported by the UE.

[0216] Step 6: The base station determines the candidate control matrix φ0 of RIS according to the RIS-UE channel information H2.

[0217] 2. BS-RIS information acquisition stage:

[0218] Step 7: The base station transmits a base station measurement signal and configures the control matrix of RIS as the candidate control matrix φ0.

[0219] Step 8: RIS switches the control matrix to φ0 according to the base station configuration and forwards the base station measurement signal to the UE.

[0220] Step 9: The UE receives the base station measurement signal and obtains the channel information H=H2φ0H1 of the BS-RIS-UE cascade channel.

[0221] Step 10: The UE reports the channel information H=H2φ0H1 of the BS-RIS-UE cascade channel to the base station.

[0222] Step 11: The base station receives the equivalent channel information H=H2φ0H1 of the BS-RIS-UE cascade channel reported by the UE.

[0223] Step 12: The base station obtains the channel information H1 of the BS-RIS segment based on the known φ0, and the channel information H2 and H.

[0224] Scenario 2: Assume that the RIS array is equipped with a control node, which has a simple signal transmission function. The control node and the RIS array are QCL. The control node transmits the RIS measurement signal, and the UE receives it, and can obtain the channel information H2 of the RIS-UE segment. Based on H2, the base station determines the candidate control matrix set Φ = {φ1,…,φ n}.

[0225] The BS-RIS information acquisition phase is as follows:

[0226] Step 1: The base station randomly selects from the candidate control matrix set of RIS, determines the first control matrix as φ2, and configures the control matrix of RIS as φ2.

[0227] Step 2: The base station transmits a base station measurement signal.

[0228] Step 3: RIS switches the control matrix to φ2 according to the base station configuration and forwards the base station measurement signal to the UE.

[0229] Step 4: The UE receives the base station measurement signal and obtains the channel information H of the BS-RIS-UE cascade channel.

[0230] Step 5: The UE reports the channel information of the BS-RIS-UE cascade channel to the base station.

[0231] Step 6: The base station receives the equivalent channel information H of the BS-RIS-UE cascade channel reported by the UE.

[0232] Step 7: The base station calculates the channel information H1 of the BS-RIS segment based on the known φ2, H2 and H using the formula H=H2φH1.

[0233] If the candidate control matrix set Φ of the RIS is determined to be {φ1, ..., φ4}, the network device may optionally execute the next step.

[0234] Step 8: The base station modifies the RIS control matrix configuration according to H1 and H2, and Φ={φ1,…,φ4}. For example, substitute H1 and H2, and Φ={φ1,…,φ4} into the formula

[0235] H=H2φH1

[0236] get

[0237]

[0238] Compare Select so that The largest RIS control matrix φ i As the first regulatory matrix for updating.

[0239] For example, calculation

[0240] tr(H2φ i H1),i=1,…,4

[0241] ||H2φ i H1||,i=1,…,4

[0242] According to the first preset condition, select the φ that meets the requirements i As the updated first control matrix, several possible first preset conditions are:

[0243] ||H2φ i H1|| satisfies a certain threshold, and tr(H2φ i H1) Smallest φ i .

[0244] ||H2φ i H1|| is the largest, and tr(H2φ i H1) Smallest φ i .

[0245] Scenario 3: Assume that a RIS array has M RIS transceiver beam pairs, each RIS transceiver beam pair corresponds to a RIS control matrix, and the RIS transceiver beam pair is a combination of a RIS transmit beam and a RIS receive beam. RIS is controlled by a control node, and the control node and the RIS array are QCL. The RIS control node has a simple signal transmission function and can transmit RIS measurement signals.

[0246] Predefined rules: The RIS transmit and receive beam pair set is known to the base station, RIS and UE.

[0247] Stpe1: The RIS control node transmits the RIS measurement signal.

[0248] Step 2: The UE receives the RIS measurement signal, performs measurement, and obtains H2 (eg, angle information of the RIS measurement signal reaching the UE).

[0249] Step 3: The UE determines a set of candidate control matrices Φ = {φ1, ..., φ4} of the RIS according to the obtained H2. The determination process is: determining a sending direction of the RIS measurement signal according to H2, and determining a set of candidate control matrices according to the sending direction.

[0250] The process of determining the candidate control matrix of RIS based on the obtained H2 can be performed in the UE or in the base station. If it is performed in the base station, the UE behavior of step 3 is modified as follows: the UE reports the obtained H2 to the base station. And step 4 is added: the base station determines the candidate control matrix of RIS based on the H2 reported by the UE. The determination process is consistent with the above.

[0251] Afterwards, the steps of the base station and the UE are as shown in scenario 1 and will not be repeated here.

[0252] Scenario 4: Assume that a RIS array has M RIS transmit-receive beam pairs. Each RIS transmit-receive beam pair corresponds to a RIS control matrix. The RIS transmit-receive beam pair is a combination of a RIS transmit beam and a RIS receive beam. The RIS control matrix is ​​a quantized matrix. The control matrix of the RIS corresponding to the M RIS transmit-receive beam pairs is {φ1,…,φ M}. RIS is a partially active array. The process of determining the candidate control matrix according to H2 is as follows:

[0253] calculate

[0254] f(φ i )=||H2φ i ||,i=1,…,M

[0255] Choose such that f(φ i ) is greater than the first threshold value of multiple φ i as a candidate regulatory matrix.

[0256] Afterwards, the steps of the base station and the UE are as shown in scenario 1 and will not be repeated here.

[0257] like Figure 4 As shown, an embodiment of the present application provides a method for acquiring channel information of a cascade channel, including:

[0258] Step 401: The terminal sends at least one of the following to the network device:

[0259] Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal;

[0260] The third channel information is the status information of the channel between the network device and the RIS.

[0261] In this way, the terminal sends the second channel information and / or the third channel information, which reduces measurement overhead and complexity and achieves efficient and accurate channel information acquisition.

[0262] Optionally, the method further comprises:

[0263] The terminal performs measurement according to a received second measurement signal to determine first channel information, where the second measurement signal is sent by the RIS.

[0264] Optionally, the method further comprises:

[0265] The terminal sends the first channel information to the network device.

[0266] Optionally, the method further comprises:

[0267] The terminal determines a first control matrix according to the first channel information, and sends the first control matrix to the network device; or,

[0268] The terminal determines a candidate control matrix according to the first channel information, and sends the candidate control matrix to the network device; or,

[0269] The terminal determines a candidate control matrix according to the first channel information, selects any control matrix from the candidate control matrices as the first control matrix, and sends the first control matrix to the network device.

[0270] Optionally, the method further comprises:

[0271] The terminal performs measurement according to a received first measurement signal to determine second channel information, where the first measurement signal is sent by the network device.

[0272] In this way, after determining the second channel information, the terminal sends the second channel information to the network device.

[0273] Optionally, the method further comprises:

[0274] The terminal determines the third channel information according to the second channel information, the first control matrix and the first channel information.

[0275] In this way, after determining the third channel information, the terminal sends the third channel information to the network device.

[0276] Optionally, the terminal determines the third channel information according to the second channel information, the first control matrix and the first channel information, including:

[0277] Calculate the third channel information by the formula H=H2φH1;

[0278] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0279] Optionally, the method further comprises:

[0280] The terminal updates the first control matrix based on the second channel information, the third channel information and the candidate control matrix so that at least one of the following satisfies a first preset condition:

[0281] Received signal power;

[0282] Letter drying ratio.

[0283] Optionally, the terminal determines a first control matrix according to the first channel information, including:

[0284] The terminal determines a sending direction of a received signal based on the first channel information, and determines the first control matrix based on the sending direction; or,

[0285] The terminal determines the first control matrix based on the first channel information so that at least one of the following satisfies a second preset condition:

[0286] Received signal power;

[0287] Signal-to-noise ratio.

[0288] It should be noted that this method is implemented in conjunction with the method executed by the above-mentioned network device. The implementation method of the above-mentioned network device side method embodiment is applicable to this method and can also achieve the same technical effect.

[0289] like Figure 5 As shown, an embodiment of the present application provides a method for acquiring channel information of a cascade channel, including:

[0290] Step 501: RIS receives first measurement configuration information sent by a network device, where the first measurement configuration information carries a first control matrix;

[0291] Step 502: After receiving the first measurement signal sent by the network device, the RIS forwards the first measurement signal to the terminal according to the first control matrix;

[0292] The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

[0293] In this way, the network device sends the first measurement configuration information and the first measurement signal to the RIS. After receiving the first measurement signal, the RIS can use the first control matrix to forward the first measurement signal to the terminal, so that the terminal receives the first measurement signal to measure and obtain the state information of the cascade channel between the network device and the terminal, reducing the measurement overhead and complexity, and achieving efficient and accurate channel information acquisition.

[0294] Optionally, the method further comprises:

[0295] The RIS receives second measurement configuration information sent by the network device;

[0296] The RIS sends a second measurement signal to the terminal according to the second measurement configuration information;

[0297] The second measurement signal is used by the terminal to measure the state information of the channel between the RIS and the terminal.

[0298] It should be noted that this method is implemented in conjunction with the method executed by the above-mentioned network device. The implementation method of the above-mentioned network device side method embodiment is applicable to this method and can also achieve the same technical effect.

[0299] like Figure 6 As shown, the embodiment of the present application also provides a channel information acquisition device for a cascade channel, including: a memory 620, a transceiver 610, and a processor 600: the memory 620 is used to store program instructions; the transceiver 610 is used to send and receive data under the control of the processor 600; the processor 600 is used to read the program instructions in the memory 620;

[0300] The transceiver performs the following operations:

[0301] sending first measurement configuration information to the RIS according to a first control matrix of the RIS;

[0302] sending a first measurement signal to the RIS;

[0303] The first measurement signal is used by the terminal to measure the status information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

[0304] Among them, Figure 6 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 610 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, which transmission medium may include a wireless channel, a wired channel, an optical cable, and the like. The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 when performing operations.

[0305] The processor 600 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (CPLD). The processor may also adopt a multi-core architecture.

[0306] Optionally, the processor is used to: obtain a first control matrix of the intelligent reflecting surface RIS.

[0307] Optionally, the transceiver is further used for:

[0308] receiving first channel information fed back by the terminal, where the first channel information is state information of a channel between the RIS and the terminal;

[0309] The processor is further configured to:

[0310] Determine the first control matrix according to the first channel information; or,

[0311] A candidate control matrix is ​​determined according to the first channel information, and any control matrix among the candidate control matrices is selected as the first control matrix.

[0312] Optionally, the transceiver is further used for:

[0313] receiving the first control matrix sent by the terminal; or,

[0314] The candidate control matrix is ​​received from the terminal, and any control matrix among the candidate control matrix is ​​selected as the first control matrix.

[0315] Optionally, the transceiver is further used for:

[0316] Sending second measurement configuration information to the RIS, where the second measurement configuration information is used to instruct the RIS to send a second measurement signal, where the second measurement signal is used by the terminal to measure state information of a channel between the RIS and the terminal.

[0317] Optionally, the transceiver is further used for:

[0318] receiving the second channel information and / or the third channel information fed back by the terminal;

[0319] The second channel information is state information of a cascade channel between the network device and the terminal;

[0320] The third channel information is status information of a channel between the network device and the RIS.

[0321] Optionally, the processor is further configured to:

[0322] After receiving the second channel information, the third channel information is determined according to the second channel information, the first control matrix and the first channel information.

[0323] Optionally, the processor is further configured to:

[0324] Calculate the third channel information by the formula H=H2φH1;

[0325] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0326] Optionally, the processor is further configured to:

[0327] Based on the second channel information, the third channel information and the candidate control matrix, the first control matrix is ​​updated so that at least one of the following satisfies a first preset condition:

[0328] Received signal power;

[0329] Letter drying ratio.

[0330] Optionally, the processor is further configured to:

[0331] determining a sending direction of a received signal based on the first channel information, and determining the first control matrix based on the sending direction; or,

[0332] The first control matrix is ​​determined based on the first channel information so that at least one of the following satisfies a second preset condition:

[0333] Received signal power;

[0334] Signal-to-noise ratio.

[0335] In the device of the embodiment of the present application, the first control matrix is ​​sent to the RIS through the first measurement configuration information, and the network device also sends the first measurement signal to the RIS, so that after the RIS receives the first measurement signal, it can use the first control matrix to forward the first measurement signal to the terminal, so that the terminal receives the first measurement signal to measure and obtain the state information of the cascade channel between the network device and the terminal, thereby reducing the measurement overhead and complexity, and realizing efficient and accurate channel information acquisition.

[0336] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0337] like Figure 7 As shown, the present application also provides a channel information acquisition device for a cascade channel, including:

[0338] A first sending module 710, configured to send first measurement configuration information to the RIS according to a first control matrix of the RIS;

[0339] A second sending module 720, configured to send a first measurement signal to the RIS;

[0340] The first measurement signal is used by the terminal to measure the status information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

[0341] Optionally, the device further comprises:

[0342] The acquisition module is used to acquire the first control matrix of the intelligent reflecting surface RIS.

[0343] Optionally, the device further comprises:

[0344] A first receiving module, configured to receive first channel information fed back by the terminal, where the first channel information is state information of a channel between the RIS and the terminal;

[0345] The acquisition module is also used for:

[0346] Determine the first control matrix according to the first channel information; or,

[0347] A candidate control matrix is ​​determined according to the first channel information, and any control matrix among the candidate control matrices is selected as the first control matrix.

[0348] Optionally, the acquisition module is further used for:

[0349] receiving the first control matrix sent by the terminal; or,

[0350] The candidate control matrix is ​​received from the terminal, and any control matrix among the candidate control matrix is ​​selected as the first control matrix.

[0351] Optionally, the device further comprises:

[0352] The fourth sending module is used to send second measurement configuration information to the RIS, where the second measurement configuration information is used to instruct the RIS to send a second measurement signal, where the second measurement signal is used by the terminal to measure state information of a channel between the RIS and the terminal.

[0353] Optionally, the device further comprises:

[0354] A second receiving module, configured to receive the second channel information and / or the third channel information fed back by the terminal;

[0355] The second channel information is state information of a cascade channel between the network device and the terminal;

[0356] The third channel information is status information of a channel between the network device and the RIS.

[0357] Optionally, the device further comprises:

[0358] The first processing module is used to determine the third channel information according to the second channel information, the first control matrix and the first channel information after receiving the second channel information.

[0359] Optionally, the first processing module is further used for:

[0360] Calculate the third channel information by the formula H=H2φH1;

[0361] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0362] Optionally, the device further comprises:

[0363] A first updating module is configured to update the first control matrix based on the second channel information, the third channel information and the candidate control matrix so that at least one of the following satisfies a first preset condition:

[0364] Received signal power;

[0365] Letter drying ratio.

[0366] Optionally, the acquisition module is further used for:

[0367] determining a sending direction of a received signal based on the first channel information, and determining the first control matrix based on the sending direction; or,

[0368] The first control matrix is ​​determined based on the first channel information so that at least one of the following satisfies a second preset condition:

[0369] Received signal power;

[0370] Signal-to-noise ratio.

[0371] The apparatus of the embodiment of the present application will send the first control matrix to the RIS through the first measurement configuration information, and the network device will also send the first measurement signal to the RIS, so that after the RIS receives the first measurement signal, it can use the first control matrix to forward the first measurement signal to the terminal, so that the terminal receives the first measurement signal to measure and obtain the state information of the cascade channel between the network device and the terminal, reducing the measurement overhead and complexity, and achieving efficient and accurate channel information acquisition.

[0372] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0373] In some embodiments of the present application, a processor-readable storage medium is further provided, wherein the processor-readable storage medium stores program instructions, and the program instructions are used to enable the processor to execute the steps of the method for implementing network device execution.

[0374] When the program instructions are executed by the processor, the above application can be realized. Figure 2 To avoid repetition, all implementations of the method embodiment on the network device side shown are not described again here.

[0375] like Figure 8 As shown, the present application also provides a channel information acquisition device for a cascade channel, including: a memory 820, a transceiver 810, and a processor 800: the memory 820 is used to store program instructions; the transceiver 810 is used to send and receive data under the control of the processor 800; the processor 800 is used to read the program instructions in the memory 820, and the transceiver 810 is used to perform the following operations:

[0376] Send at least one of the following to the network device:

[0377] Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal;

[0378] The third channel information is the status information of the channel between the network device and the RIS.

[0379] Among them, Figure 8In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 800 and various circuits of memory represented by memory 820 are linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 810 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, including wireless channels, wired channels, optical cables, and other transmission media. For different user devices, the user interface 830 may also be an interface capable of externally and internally connecting required devices, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0380] The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 can store data used by the processor 800 when performing operations.

[0381] Optionally, the processor is configured to:

[0382] Perform measurement according to a received second measurement signal to determine first channel information, where the second measurement signal is sent by the RIS.

[0383] Optionally, the transceiver is further used for:

[0384] The first channel information is sent to the network device.

[0385] Optionally, the processor is further configured to:

[0386] Determine a first control matrix according to the first channel information, and send the first control matrix to the network device; or,

[0387] Determine a candidate control matrix according to the first channel information, and send the candidate control matrix to the network device; or,

[0388] A candidate control matrix is ​​determined according to the first channel information, and any control matrix among the candidate control matrices is selected as the first control matrix, and the first control matrix is ​​sent to the network device.

[0389] Optionally, the processor is further configured to:

[0390] Perform measurement according to a received first measurement signal to determine second channel information, where the first measurement signal is sent by the network device.

[0391] Optionally, the processor is further configured to:

[0392] The third channel information is determined according to the second channel information, the first control matrix and the first channel information.

[0393] Optionally, the processor is further configured to:

[0394] Calculate the third channel information by the formula H=H2φH1;

[0395] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0396] Optionally, the processor is further configured to:

[0397] Based on the second channel information, the third channel information and the candidate control matrix, the first control matrix is ​​updated so that at least one of the following satisfies a first preset condition:

[0398] Received signal power;

[0399] Letter drying ratio.

[0400] Optionally, the processor is further configured to:

[0401] determining a sending direction of a received signal based on the first channel information, and determining the first control matrix based on the sending direction; or,

[0402] The first control matrix is ​​determined based on the first channel information so that at least one of the following satisfies a second preset condition:

[0403] Received signal power;

[0404] Signal-to-noise ratio.

[0405] Optionally, the processor 800 may be a CPU (central processing unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array) or a CPLD (Complex Programmable Logic Device), and the processor 800 may also adopt a multi-core architecture.

[0406] The processor 800 calls the program instructions stored in the memory to execute any of the methods provided in the embodiments of the present application according to the obtained executable instructions. The processor 800 and the memory 820 can also be arranged physically separately.

[0407] The device of the embodiment of the present application sends the second channel information and / or the third channel information, reduces the measurement overhead and complexity, and realizes efficient and accurate channel information acquisition.

[0408] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0409] like Fig. 9 As shown, the present application also provides a channel information acquisition device for a cascade channel, including:

[0410] The third sending module 910 is configured to send at least one of the following to the network device:

[0411] Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal;

[0412] The third channel information is the status information of the channel between the network device and the RIS.

[0413] Optionally, the device further comprises:

[0414] The second processing module is used to perform measurement according to a received second measurement signal to determine first channel information, where the second measurement signal is sent by the RIS.

[0415] Optionally, the device further comprises:

[0416] A fifth sending module is configured to send the first channel information to the network device.

[0417] Optionally, the device further comprises:

[0418] a sixth sending module, configured to determine a first control matrix according to the first channel information, and send the first control matrix to the network device; or,

[0419] Determine a candidate control matrix according to the first channel information, and send the candidate control matrix to the network device; or,

[0420] A candidate control matrix is ​​determined according to the first channel information, and any control matrix among the candidate control matrices is selected as the first control matrix, and the first control matrix is ​​sent to the network device.

[0421] Optionally, the device further comprises:

[0422] The third processing module is used to perform measurement according to the received first measurement signal to determine the second channel information, where the first measurement signal is sent by the network device.

[0423] Optionally, the device further comprises:

[0424] The fourth processing module is used to determine the third channel information according to the second channel information, the first control matrix and the first channel information.

[0425] Optionally, the fourth processing module is further used for:

[0426] Calculate the third channel information by the formula H=H2φH1;

[0427] Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

[0428] Optionally, the device further comprises:

[0429] A second updating module is configured to update the first control matrix based on the second channel information, the third channel information and the candidate control matrix so that at least one of the following satisfies a first preset condition:

[0430] Received signal power;

[0431] Letter drying ratio.

[0432] Optionally, the sixth sending module is further used for:

[0433] determining a sending direction of a received signal based on the first channel information, and determining the first control matrix based on the sending direction; or,

[0434] The first control matrix is ​​determined based on the first channel information so that at least one of the following satisfies a second preset condition:

[0435] Received signal power;

[0436] Signal-to-noise ratio.

[0437] The device of the embodiment of the present application sends the second channel information and / or the third channel information, reduces the measurement overhead and complexity, and realizes efficient and accurate channel information acquisition.

[0438] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0439] In some embodiments of the present application, a processor-readable storage medium is further provided, wherein the processor-readable storage medium stores program instructions, and the program instructions are used to enable the processor to execute the method steps for implementing the above terminal execution.

[0440] When the program instructions are executed by the processor, the above application can be realized. Figure 4 To avoid repetition, all implementation methods in the terminal side method embodiment shown are not described again here.

[0441] The embodiment of the present application provides a channel information acquisition device for a cascade channel, including: a memory, a transceiver, and a processor;

[0442] A memory for storing program instructions; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading program instructions in the memory;

[0443] The transceiver performs the following operations:

[0444] Receiving first measurement configuration information sent by a network device, where the first measurement configuration information carries a first control matrix;

[0445] After receiving the first measurement signal sent by the network device, forwarding the first measurement signal to the terminal according to the first control matrix;

[0446] The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

[0447] Optionally, the transceiver is further used for:

[0448] Receiving second measurement configuration information sent by the network device;

[0449] sending a second measurement signal to the terminal according to the second measurement configuration information;

[0450] The second measurement signal is used by the terminal to measure the state information of the channel between the RIS and the terminal.

[0451] The apparatus of the embodiment of the present application is for a network device to send first measurement configuration information and a first measurement signal to a RIS. After the RIS receives the first measurement signal, it can use a first control matrix to forward the first measurement signal to a terminal, so that the terminal receives the first measurement signal and measures and obtains state information of a cascade channel between the network device and the terminal, thereby reducing measurement overhead and complexity and achieving efficient and accurate channel information acquisition.

[0452] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0453] It should also be noted that the structure of the device is similar to Figure 6 The device structure shown will not be described in detail here.

[0454] like Fig.10 As shown, the present application also provides a channel information acquisition device for a cascade channel, including:

[0455] A first configuration receiving module 1010 is configured to receive a first measurement configuration sent by a network device, where the first measurement configuration carries a first control matrix;

[0456] A measurement signal forwarding module 1020, configured to receive a first measurement signal sent by the network device and forward the first measurement signal to a terminal according to the first control matrix;

[0457] The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

[0458] Optionally, the device further comprises:

[0459] A second configuration receiving module, used to receive second measurement configuration information sent by the network device;

[0460] a measurement signal sending module, configured to send a second measurement signal to the terminal according to the second measurement configuration information;

[0461] The second measurement signal is used by the terminal to measure the state information of the channel between the RIS and the terminal.

[0462] The apparatus of the embodiment of the present application is for a network device to send first measurement configuration information and a first measurement signal to a RIS. After the RIS receives the first measurement signal, it can use a first control matrix to forward the first measurement signal to a terminal, so that the terminal receives the first measurement signal and measures and obtains state information of a cascade channel between the network device and the terminal, thereby reducing measurement overhead and complexity and achieving efficient and accurate channel information acquisition.

[0463] It should be noted here that the above-mentioned device provided in the embodiment of the present application can implement all the method steps implemented in the above-mentioned method embodiment, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as those in the method embodiment will not be described in detail here.

[0464] In some embodiments of the present application, a processor-readable storage medium is further provided, wherein the processor-readable storage medium stores program instructions, and the program instructions are used to enable the processor to execute the method steps for implementing the above RIS execution.

[0465] When the program instructions are executed by the processor, the above application can be realized. Figure 5 To avoid repetition, all implementations of the method embodiment on the RIS side are not described again here.

[0466] The technical solution provided in the embodiment of the present application can be applicable to a variety of systems, especially 5G systems. For example, applicable systems can be global system of mobile communication (Global System of Mobile communication, GSM) system, code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet radio service (General Packet Radio Service, GPRS) system, long-term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD) system, advanced long-term evolution (Long Term Evolution Advanced, LTE-A) system, universal mobile system (Universal Mobile Telecommunication System, UMTS), global interconnection microwave access (Worldwide interoperability for Microwave Access, WiMAX) system, 5G new air interface (New Radio, NR) system, etc. These various systems include terminal equipment and network equipment. The system may also include core network parts, such as the Evolved Packet System (EPS), 5G System (5GS), etc.

[0467] The terminal device involved in the embodiment of the present application may be a device that provides voice and / or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device may be called a UE. A wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device may be a mobile terminal device, such as a mobile phone (or a "cellular" phone) and a computer with a mobile terminal device. For example, it may be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges language and / or data with a radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs) and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, and a user device, but is not limited in the embodiments of the present application.

[0468] The network device involved in the embodiment of the present application may be a base station, which may include multiple cells providing services for the terminal. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, and serve as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate the attribute management of the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile communications (Global System for Mobile communications, GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA), or a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or an evolutionary network device (evolutional Node B, eNB or e-NodeB) in the Long Term Evolution (Long Term Evolution, LTE) system, a 5G base station (gNB) in the 5G network architecture (next generation system), or a home evolved Node B (Home evolved Node B, HeNB), a relay node, a home base station (femto), a pico base station (pico), etc., which is not limited in the embodiments of the present application. In some network structures, the network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be arranged geographically separately.

[0469] Network devices and terminal devices can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). Depending on the form and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, or it can be diversity transmission, precoded transmission or beamforming transmission, etc.

[0470] It should be noted that the division of units in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0471] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), disk or optical disk and other media that can store program codes.

[0472] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0473] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer executable instructions. These computer executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0474] These processor executable instructions may also be stored in a processor readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0475] These processor-executable instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0476] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for acquiring channel information of a cascade channel, characterized in that: include: The network device sends first measurement configuration information to the intelligent reflecting surface RIS according to the first control matrix of the RIS; The network device sends a first measurement signal to the RIS; Among them, the first measurement signal is used by the terminal to measure the state information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

2. The method according to claim 1, characterized in that The method further comprises: The network device obtains a first control matrix of the intelligent reflecting surface RIS.

3. The method according to claim 2, characterized in that The method further comprises: The network device receives first channel information fed back by the terminal, where the first channel information is state information of a channel between the RIS and the terminal; The network device obtains a first control matrix of a smart reflective surface RIS, including: The network device determines the first control matrix according to the first channel information; or, The network device determines a candidate control matrix according to the first channel information, and selects any control matrix from the candidate control matrices as the first control matrix.

4. The method according to claim 2, characterized in that: The network device obtains a first control matrix of a smart reflective surface RIS, including: The network device receives the first control matrix sent by the terminal; or, The network device receives the candidate control matrix sent by the terminal, and selects any control matrix among the candidate control matrix as the first control matrix.

5. The method according to claim 3 or 4, characterized in that: The method further comprises: The network device sends second measurement configuration information to the RIS, where the second measurement configuration information is used to instruct the RIS to send a second measurement signal, where the second measurement signal is used by the terminal to measure state information of a channel between the RIS and the terminal.

6. The method according to claim 1, characterized in that The method further comprises: The network device receives the second channel information and / or the third channel information fed back by the terminal; The second channel information is state information of a cascade channel between the network device and the terminal; The third channel information is status information of a channel between the network device and the RIS.

7. The method according to claim 6, characterized in that The method further comprises: After receiving the second channel information, the network device determines the third channel information according to the second channel information, the first control matrix and the first channel information.

8. The method according to claim 7, characterized in that After receiving the second channel information, the network device determines the third channel information according to the second channel information, the first control matrix and the first channel information, including: Calculate the third channel information by the formula H=H2φH1; Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

9. The method according to claim 7, characterized in that: The method further comprises: The network device updates the first control matrix based on the second channel information, the third channel information, and the candidate control matrix so that at least one of the following satisfies a first preset condition: Received signal power; Letter drying ratio.

10. The method according to claim 3, characterized in that: The network device determines the first control matrix according to the first channel information, including: The network device determines a sending direction of a received signal based on the first channel information, and determines the first control matrix based on the sending direction; or, The network device determines the first control matrix based on the first channel information so that at least one of the following satisfies a second preset condition: Received signal power; Signal-to-noise ratio.

11. A method for acquiring channel information of a cascade channel, characterized in that: include: The terminal sends at least one of the following to the network device: Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal; The third channel information is the status information of the channel between the network device and the RIS.

12. The method according to claim 11, characterized in that The method further comprises: The terminal performs measurement according to a received second measurement signal to determine first channel information, where the second measurement signal is sent by the RIS.

13. The method according to claim 12, characterized in that The method further comprises: The terminal sends the first channel information to the network device.

14. The method according to claim 12, characterized in that The method further comprises: The terminal determines a first control matrix according to the first channel information, and sends the first control matrix to the network device; or, The terminal determines a candidate control matrix according to the first channel information, and sends the candidate control matrix to the network device; or, The terminal determines a candidate control matrix according to the first channel information, selects any control matrix from the candidate control matrices as the first control matrix, and sends the first control matrix to the network device.

15. The method according to claim 11, characterized in that The method further comprises: The terminal performs measurement according to a received first measurement signal to determine second channel information, where the first measurement signal is sent by the network device.

16. The method according to claim 15, characterized in that The method further comprises: The terminal determines the third channel information according to the second channel information, the first control matrix and the first channel information.

17. The method according to claim 16, characterized in that The terminal determines the third channel information according to the second channel information, the first control matrix and the first channel information, including: Calculate the third channel information by the formula H=H2φH1; Among them, H1 is the third channel information, H2 is the first channel information, H is the second channel information, and φ is the first control matrix.

18. The method according to claim 16, characterized in that The method further comprises: The terminal updates the first control matrix based on the second channel information, the third channel information and the candidate control matrix so that at least one of the following satisfies a first preset condition: Received signal power; Letter drying ratio.

19. The method according to claim 14, characterized in that The terminal determines a first control matrix according to the first channel information, including: The terminal determines a sending direction of a received signal based on the first channel information, and determines the first control matrix based on the sending direction; or, The terminal determines the first control matrix based on the first channel information so that at least one of the following satisfies a second preset condition: Received signal power; Signal-to-noise ratio.

20. A method for acquiring channel information of a cascade channel, characterized in that: include: The RIS receives first measurement configuration information sent by the network device, where the first measurement configuration information carries a first control matrix; After receiving the first measurement signal sent by the network device, the RIS forwards the first measurement signal to the terminal according to the first control matrix; The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

21. The method according to claim 20, characterized in that The method further comprises: The RIS receives second measurement configuration information sent by the network device; The RIS sends a second measurement signal to the terminal according to the second measurement configuration information; The second measurement signal is used by the terminal to measure the state information of the channel between the RIS and the terminal.

22. A channel information acquisition device for a cascade channel, characterized in that: include: Memory, transceiver, processor; A memory for storing program instructions; a transceiver, for transmitting and receiving data under the control of the processor; A processor, configured to read program instructions from the memory; The transceiver performs the following operations: sending first measurement configuration information to the RIS according to a first control matrix of the RIS; sending a first measurement signal to the RIS; The first measurement signal is used by the terminal to measure the status information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

23. A channel information acquisition device for a cascade channel, characterized in that: include: A first sending module, configured to send first measurement configuration information to the RIS according to a first control matrix of the RIS; A second sending module, used for sending a first measurement signal to the RIS; The first measurement signal is used by the terminal to measure the status information of the cascade channel between the network device and the terminal; the first measurement configuration information is used to configure the RIS to forward the first measurement signal to the terminal using the first control matrix after receiving the first measurement signal.

24. A channel information acquisition device for a cascade channel, characterized in that: include: Memory, transceiver, processor; A memory for storing program instructions; a transceiver, for transmitting and receiving data under the control of the processor; A processor, configured to read program instructions from the memory; The transceiver performs the following operations: Send at least one of the following to the network device: Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal; The third channel information is the status information of the channel between the network device and the RIS.

25. A channel information acquisition device for a cascade channel, characterized in that: include: The third sending module is used to send at least one of the following to the network device: Second channel information, where the second channel information is state information of a cascade channel between the network device and the terminal; The third channel information is the status information of the channel between the network device and the RIS.

26. A channel information acquisition device for a cascade channel, characterized in that: include: Memory, transceiver, processor; A memory for storing program instructions; a transceiver, for transmitting and receiving data under the control of the processor; A processor, configured to read program instructions from the memory; The transceiver performs the following operations: Receiving first measurement configuration information sent by a network device, where the first measurement configuration information carries a first control matrix; After receiving the first measurement signal sent by the network device, forwarding the first measurement signal to the terminal according to the first control matrix; The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

27. A channel information acquisition device for a cascade channel, characterized in that: include: A first configuration receiving module, configured to receive a first measurement configuration sent by a network device, wherein the first measurement configuration carries a first control matrix; a measurement signal forwarding module, configured to receive a first measurement signal sent by the network device and forward the first measurement signal to a terminal according to the first control matrix; The first measurement signal is used by the terminal to measure state information of a cascade channel between the network device and the terminal.

28. A processor-readable storage medium, characterized in that: The processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the channel information acquisition method for the cascaded channel according to any one of claims 1 to 10, or the channel information acquisition method for the cascaded channel according to any one of claims 11 to 19, or the channel information acquisition method for the cascaded channel according to claim 20 or 21.

Images