Broadband communication system, control method and apparatus

Abstract

The application provides a broadband control system, a control method and a device. The broadband control system comprises: an RIS array, the RIS array comprising a plurality of RIS sub-arrays; a true time delay control module, configured to apply time delay or phase shift processing to a beam signal input into the RIS array, so that the beam signal output by the RIS array is in a target state; the target state comprises a first state and a second state, in the first state, the beam signal of all frequency bands is directed to the direction of a same terminal; in the second state, the beam signal of different frequency bands is directed to different terminal directions. The application combines the RIS array with the true time delay control module, applies time delay or phase shift to the input beam signal, realizes true time delay or phase shift regulation and control, can effectively solve the problem of aperture effect, and guarantees communication quality. Through frequency band regulation and control of the beam signal, SU-MIMO communication or MU-MIMO communication can be realized.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a broadband control system, control method, and apparatus. Background Technology

[0002] When using large-scale reconfigurable intelligent surface (RIS) arrays, the spacing between the oscillators is set to a fixed value during the initial manufacturing process (typically a constant value within the 0.1 to 0.5 wavelength range of the center frequency). Since traditional RIS communication can only assign one set of phase values ​​simultaneously, this same set of weights will produce a significant aperture effect at high bandwidths, characterized by beam splitting and inability to align. Targeting the oscillator spacing at the center frequency makes this aperture effect significant at high bandwidths. Summary of the Invention

[0003] The purpose of this invention is to provide a broadband control system, control method, and device that solves the problem of significant aperture effect in traditional RIS communication systems.

[0004] An embodiment of the present invention provides a broadband communication system, comprising:

[0005] A reconfigurable smart surface RIS array, wherein the RIS array comprises multiple RIS subarrays;

[0006] A true time delay control module is used to apply a time delay or perform phase shift processing on the beam signal input to the RIS array so that the beam signal output by the RIS array is in the target state.

[0007] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0008] Optionally, in the second state, the frequency band of the beam signal corresponds to the terminal. Optionally, the true delay control module includes:

[0009] Feed source, each of the feed sources corresponds to one of the RIS subarrays;

[0010] The first true delay device is connected to the feed source via a true delay line. The first true delay device controls the feed source to emit electromagnetic waves to the corresponding RIS subarray via the true delay line.

[0011] Optionally, the true delay control module includes:

[0012] Second true delay device;

[0013] A first control circuit, one end of which is connected to the second true delay device, and the other end of which is connected to the RIS subarray.

[0014] Optionally, the broadband communication system further includes: a reflective element;

[0015] The second true delay device and the first control circuit are disposed on the first side of the reflective element, and the RIS array is disposed on the second side of the reflective element.

[0016] Optionally, the true delay control module includes:

[0017] Controller;

[0018] A second control circuit is provided, through which the controller is connected to the RIS array.

[0019] Each of the RIS subarrays is connected to N second control circuits, and the N second control circuits are connected in parallel; each second control circuit includes a bandpass filter and a phase shift controller.

[0020] N is a positive integer greater than or equal to 2.

[0021] Optionally, the bandpass filter and the phase shift controller are connected in series;

[0022] The bandpass filter is connected to the first end of the RIS subarray, and the phase shift controller is connected to the second end of the RIS subarray.

[0023] An embodiment of the present invention provides a control method for a broadband communication system, applied to the broadband communication system, comprising:

[0024] Based on the broadband communication scenario, determine the target state of the beam signal output by the RIS array;

[0025] Based on the target state, the true delay control module is controlled to apply a time delay or perform phase shift processing on the beam signal input to the RIS array;

[0026] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0027] Optionally, based on the broadband communication scenario, the target state of the beam signal output by the RIS array is determined, including:

[0028] If the broadband communication scenario is a single-user multiple-input multiple-output scenario, then the target state is determined to be the first state;

[0029] or,

[0030] If the broadband communication scenario is a multi-user, multi-input, multi-output scenario, then the target state is determined to be the second state.

[0031] Optionally, controlling the true delay control module to apply a time delay to the beam signal input to the RIS array according to the target state includes:

[0032] If the target state is the first state, an initial communication link is established;

[0033] Determine the true delay compensation target for optimizing the initial communication link;

[0034] Determine the true delay control matrix that minimizes the mean square error relative to the true delay compensation target;

[0035] Based on the relationship between the true delay control matrix and the center frequency of each frequency band, the time delay to be applied to the beam signal of each frequency band is determined;

[0036] The true delay device of the true delay control module applies the corresponding delay to be applied to the RIS subarray corresponding to the beam signal of each frequency band.

[0037] Optionally, before applying the corresponding time delay to the RIS subarray corresponding to the beam signal of each frequency band, the method further includes:

[0038] Based on the beam information of the center frequency point of each frequency band, generate the initial beamforming codewords corresponding to the beam signals of different frequency bands;

[0039] The initial beamforming codeword is assigned to the RIS subarray corresponding to the beam signal.

[0040] Optionally, determining the true delay compensation target for optimizing the initial communication link includes:

[0041] Based on the angular domain information of the beam signal, codewords corresponding to the center frequency points of different frequency bands are generated;

[0042] The codeword is determined as the true delay compensation target.

[0043] Optionally, based on the target state, the true delay control module is controlled to perform phase-shifting processing on the beam signal input to the RIS array, including:

[0044] If the target state is the first state, an initial communication link is established;

[0045] For the center frequency of different frequency bands, determine the phase shift value corresponding to each second control circuit;

[0046] Based on the phase shift value, phase shift processing is performed on each of the second control circuits.

[0047] Optionally, based on the target state, the true delay control module is controlled to perform phase-shifting processing on the beam signal input to the RIS array, including:

[0048] When the target state is the second state, bandwidth is allocated to different terminals;

[0049] Based on the relevant information of each terminal and the bandwidth corresponding to the terminal, determine the RIS phase shift matrix corresponding to the terminal;

[0050] Each second control circuit is phase-shifted according to the RIS phase-shift matrix.

[0051] Embodiments of the present invention provide a control device for a broadband communication system, comprising: a memory, a transceiver, and a processor.

[0052] A memory for storing computer programs; a transceiver for receiving and sending data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0053] Based on the broadband communication scenario, determine the target state of the beam signal output by the RIS array;

[0054] Based on the target state, the true delay control module is controlled to apply a time delay or perform phase shift processing on the beam signal input to the RIS array;

[0055] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0056] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0057] If the broadband communication scenario is a single-user multiple-input multiple-output scenario, then the target state is determined to be the first state;

[0058] or,

[0059] If the broadband communication scenario is a multi-user, multi-input, multi-output scenario, then the target state is determined to be the second state.

[0060] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0061] If the target state is the first state, an initial communication link is established;

[0062] Determine the true delay compensation target for optimizing the initial communication link;

[0063] Determine the true delay control matrix that minimizes the mean square error relative to the true delay compensation target;

[0064] Based on the relationship between the true delay control matrix and the center frequency of each frequency band, the time delay to be applied to the beam signal of each frequency band is determined;

[0065] The true delay device of the true delay control module applies the corresponding delay to be applied to the RIS subarray corresponding to the beam signal of each frequency band.

[0066] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0067] Based on the beam information of the center frequency point of each frequency band, generate the initial beamforming codewords corresponding to the beam signals of different frequency bands;

[0068] The initial beamforming codeword is assigned to the RIS subarray corresponding to the beam signal.

[0069] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0070] Based on the angular domain information of the beam signal, codewords corresponding to the center frequency points of different frequency bands are generated;

[0071] The codeword is determined as the true delay compensation target.

[0072] Optionally, if the target state is the first state, an initial communication link is established;

[0073] For the center frequency of different frequency bands, determine the phase shift value corresponding to each second control circuit;

[0074] Based on the phase shift value, phase shift processing is performed on each of the second control circuits.

[0075] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0076] When the target state is the second state, bandwidth is allocated to different terminals;

[0077] Based on the relevant information of each terminal and the bandwidth corresponding to the terminal, determine the RIS phase shift matrix corresponding to the terminal;

[0078] Each second control circuit is phase-shifted according to the RIS phase-shift matrix.

[0079] Embodiments of the present invention provide a control device for a broadband communication system, comprising:

[0080] The first determining unit is used to determine the target state of the beam signal output by the RIS array based on the broadband communication scenario.

[0081] The first control unit is configured to control the true delay control module to apply a time delay or perform phase shift processing on the beam signal input to the RIS array according to the target state.

[0082] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0083] An embodiment of the present invention provides a processor-readable storage medium having a computer program stored thereon, characterized in that the computer program, when executed by a processor, implements the steps of the control method for the broadband communication system described above.

[0084] The beneficial effects of the above-mentioned technical solution of the present invention are:

[0085] The embodiments of this application combine a RIS array with a true delay control module to apply a time delay or perform phase shift processing on the input beam signal, achieving true delay or phase shift-based control. This effectively solves the aperture effect problem and ensures communication quality. The output beam signal can operate in a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction, enabling SU-MIMO communication. In the second state, beam signals of different frequency bands point to different terminal directions, enabling MU-MIMO communication, thus achieving frequency-band control of the beam signal. Attached Figure Description

[0086] Figure 1 One of the schematic diagrams of a broadband communication system according to an embodiment of the present invention is shown.

[0087] Figure 2 A second schematic diagram illustrating the structure of a broadband communication system according to an embodiment of the present invention;

[0088] Figure 3 The third schematic diagram illustrating the structure of the broadband communication system according to an embodiment of the present invention;

[0089] Figure 4 A flowchart illustrating the control method of a broadband communication system according to an embodiment of the present invention;

[0090] Figure 5 One of the schematic diagrams showing the structure of the control device of the broadband communication system according to an embodiment of the present invention;

[0091] Figure 6 This is the second schematic diagram showing the structure of the control device of the broadband communication system according to an embodiment of the present invention. Detailed Implementation

[0092] To make the technical problems, technical solutions, and advantages of this invention clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this invention. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this invention. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0093] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0094] In various embodiments of the present invention, it should be understood that the sequence number of each process described below does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0095] In the embodiments of this application, the term "and / or" describes the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0096] In the embodiments of this application, the term "multiple" refers to two or more, and other quantifiers are similar.

[0097] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0098] Embodiments of this application provide a broadband control system, control method, and apparatus to solve the problem of significant aperture effect in traditional RIS communication systems.

[0099] like Figures 1 to 3 As shown, this application provides a broadband communication system, including:

[0100] A reconfigurable smart surface RIS array, wherein the RIS array comprises multiple RIS subarrays;

[0101] A true time delay control module is used to apply a time delay or perform phase shift processing on the beam signal input to the RIS array so that the beam signal output by the RIS array is in the target state.

[0102] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0103] In this embodiment, the RIS array can modulate the frequency, phase, polarization, and other characteristics of reflected or transmitted electromagnetic waves, thereby reshaping the wireless channel. The RIS array comprises multiple sequentially arranged RIS subarrays, and the state of these subarrays can be dynamically controlled through digital encoding, thus manipulating electromagnetic waves. The RIS array can reflect or transmit received electromagnetic waves, enabling electromagnetic wave transmission.

[0104] The true delay control module can apply a time delay to the electromagnetic waves input to the RIS array or perform phase shifting on the electromagnetic waves. In the embodiments of this application, applying a time delay or performing phase shifting on the beam signal of broadband communication can effectively solve the aperture effect problem and ensure communication quality. The true delay control module can be directly connected to the RIS array and control the input electromagnetic waves through a control circuit; alternatively, the true delay control module can be independent of the RIS array, applying a time delay to the electromagnetic waves and then sending the electromagnetic wave signal to the RIS array via electromagnetic wave illumination.

[0105] The true delay control module and the RIS array reflect or transmit the input beam signal, and the output beam signal, after modulation, can operate in the target state. Specifically, in the first state, after the true delay control module and the RIS array modulate the beam signal, all output frequency band beam signals point towards the same terminal, meaning the network side transmits beam signals towards the same terminal. This state enables a single-user multiple-input multiple-output (SU-MIMO) communication scenario. In the second state, after the true delay control module and the RIS array modulate the beam signal, the output beam signals of different frequency bands can point towards different terminals, meaning the network side transmits different frequency band beam signals towards different terminals. This state enables a multi-user multiple-input multiple-output (MU-MIMO) communication scenario.

[0106] The embodiments of this application combine a RIS array with a true delay control module to apply a time delay or perform phase shift processing on the input beam signal, achieving true delay or phase shift-based control. This effectively solves the aperture effect problem and ensures communication quality. The output beam signal can operate in a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction, enabling SU-MIMO communication. In the second state, beam signals of different frequency bands point to different terminal directions, enabling MU-MIMO communication, thus achieving frequency-band control of the beam signal.

[0107] Optionally, in the second state, the frequency band of the beam signal corresponds to the terminal. In this embodiment, for MU-MIMO communication scenarios, when the network-side device needs to transmit beam signals to multiple terminals, it needs to allocate frequency bands for each terminal, that is, different terminals are assigned to receive signals of different frequency bands to avoid interference between the received signals of different terminals. Each terminal corresponds to the frequency band of the beam signal. After the RIS array and the true delay control module regulate the input beam signal, they transmit it to the corresponding terminal according to the frequency band of the beam signal, thereby realizing frequency band control of the beam signal.

[0108] As an optional embodiment, the broadband communication system is as follows: Figure 1 As shown, the true delay control module includes:

[0109] Feed source 11, each of the feed sources 11 corresponds to one of the RIS subarrays 12;

[0110] The first true delay device 13 is connected to the feed source 11 through a true delay line. The first true delay device 13 controls the feed source 11 to emit electromagnetic waves to the corresponding RIS subarray 12 through the true delay line.

[0111] In this embodiment, the broadband communication system can be located on the network side, forming a transmissive RIS transmitter. The first true delay device 13 applies a time delay to the electromagnetic waves emitted by the network-side equipment (such as a base station) before transmitting them to the RIS subarray 12. After receiving the electromagnetic waves emitted by the feed 11, the RIS subarray 12 transmits them to the terminal through transmission. Each feed 11 illuminates one RIS subarray.

[0112] In this embodiment, multiple feed antennas (e.g., horn antennas) are used to illuminate the RIS subarray, with each feed 11 equipped with a true delay line for control. By illuminating the RIS subarray, the spatial distance between the feed 11 and the RIS subarray can be greatly shortened, reducing the deployment space and also reducing the path loss between the feed 11 and the RIS array, thus ensuring the stability of this channel segment.

[0113] In the first state, where SU-MIMO communication is required, a true delay line assigns different delays to signals in different frequency bands, ensuring that all beam signals point in the same direction (the location of the UE). In the second state, where MU-MIMO communication is required, a true delay line assigns designed delays to signals in different frequency bands. This, combined with the phase array of the RIS, optimizes the beams at different frequencies to point in the direction of different terminals, thus catering to different users.

[0114] As another optional embodiment, the broadband communication system is as follows: Figure 2 As shown, the true delay control module includes:

[0115] Second true delay device 21;

[0116] A first control circuit, one end of which is connected to the second true delay device 21, and the other end of which is connected to the RIS subarray 22.

[0117] In this embodiment, the second true delay device 21 is directly connected to the RIS subarray 22 through the first control circuit of the RIS array. The second true delay device 21 applies a delay to the beam signal input to the RIS array through the first control circuit, thereby weakening and reducing the impact of aperture effect on broadband communication.

[0118] Optionally, the broadband communication system further includes: a reflective element 23; the second true delay device 21 and the first control circuit are disposed on the first side of the reflective element 23, and the RIS array is disposed on the second side of the reflective element 23.

[0119] In this embodiment, the second true delay device 21 and the first control circuit are respectively disposed on different sides of the reflective element 23, which can prevent interference from circuit traces to the RIS array. The reflective element 23 can be a metal backplane, and the beam signal emitted by the network side is reflected to the terminal after passing through the RIS array and the metal backplane. Figure 2 The broadband communication system shown is a reflective RIS communication architecture. Based on a traditional reflective RIS, a second true delay device 21 is added to the control circuit of the RIS subarray. This second true delay device 21 can be arranged on the same side of the metal backplane as the first control circuit without affecting the reflection performance of the RIS array. This scheme allows for flexible deployment of the broadband communication system while ensuring broadband communication capabilities. That is, the broadband communication system can achieve broadband beam control capabilities whether deployed on the network side, the user side, or as a relay.

[0120] Optionally, the first true time delay device and the second true time delay device can be implemented using complementary metal-oxide-semiconductor (CMOS), optical waveguide design, acoustic bulk wave design, etc. Different frequency beam signals pass through a medium with adjustable equivalent length (such as dielectric, optical medium, acoustic medium, etc.) to achieve the corresponding time delay requirements. For example, optical waveguides use materials such as gratings or organic polymers to control the optical path difference to achieve the time delay effect.

[0121] As another optional embodiment, the broadband communication system is as follows: Figure 3 As shown, the true delay control module includes:

[0122] Controller 31;

[0123] The second control circuit 32 is used to connect the controller 31 to the RIS array.

[0124] Each of the RIS subarrays 33 is connected to N second control circuits 32, and the N second control circuits 32 are connected in parallel; each second control circuit 32 includes a bandpass filter and a phase shift controller; N is a positive integer greater than or equal to 2.

[0125] Optionally, the bandpass filter and the phase shift controller are connected in series; the bandpass filter is connected to the first end of the RIS subarray 33, and the phase shift controller is connected to the second end of the RIS subarray.

[0126] Optionally, the broadband communication system further includes a reflective element 34. The reflective element 34 may be a metal backplane, wherein the beam signal transmitted from the network side is reflected to the terminal after passing through the RIS array and the metal backplane.

[0127] In this embodiment, true time delay performance is achieved by a second control circuit 32 including a bandpass filter and a phase shift controller. Each RIS subarray 33 is connected to N parallel paths of the second control circuit 32. Figure 3 Only one of the second control circuits 32 is shown in the diagram. Each of the second control circuits 32 includes a bandpass filter and a phase shift controller. When the beam signal transmitted from the network side reaches the RIS array, the bandpass filter filters the input beam signal, thereby enabling each second control circuit 32 to regulate the beam signal of different frequency bands. For example, when SU-MIMO communication is required, each second control circuit performs phase shifting processing on the beam signal of the corresponding frequency band, so that the beam signals of all frequency bands point to the same terminal direction; when MU-MIMO communication is required, each second control circuit performs phase shifting processing on the beam signal of the corresponding frequency band, so that the beams of different frequency bands point to different terminals, corresponding to different users.

[0128] The RIS array can be a waveguide-structured RIS array. By using a parallel multiplexer control circuit, the reflective RIS array can simultaneously possess the functionality of a true delay line. Figure 3 Only one of the multiplexed control circuits is shown as an example. By adding a bandpass filter and a phase shift controller to the control circuit of each parallel RIS (Rack and Receiver Instructions) circuit, the beam direction of each sub-band can be individually controlled. This allows for simultaneous convergence of all beam signals for SU-MIMO communication scenarios, or separate control of each beam direction for MU-MIMO communication scenarios. In this scheme, the parallel multiplexed bandpass phase shift control circuit enables the RSI array itself to act as a true time delay device. By phase-shifting the beam signal input to the RIS array, it can apply a time delay, thus adjusting the beam signal for broadband communication and avoiding the impact of aperture effects on the communication process.

[0129] The embodiments of this application combine a RIS array with a true delay control module to apply a time delay or perform phase shift processing on the input beam signal, achieving true delay or phase shift-based control. This effectively solves the aperture effect problem and ensures communication quality. The output beam signal can operate in a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction, enabling SU-MIMO communication. In the second state, beam signals of different frequency bands point to different terminal directions, enabling MU-MIMO communication, thus achieving frequency-band control of the beam signal.

[0130] like Figure 4 As shown, an embodiment of this application provides a control method for a broadband communication system, applied to the aforementioned broadband communication system, specifically including the following steps:

[0131] Step 401: Determine the target state of the beam signal output by the RIS array based on the broadband communication scenario;

[0132] Step 402: According to the target state, control the true delay control module to apply a time delay or perform phase shift processing on the beam signal input to the RIS array;

[0133] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0134] In this embodiment, the broadband communication scenarios include SU-MIMO and MU-MIMO communication scenarios. For different communication scenarios, the required beam signal states can be determined when executing the corresponding communication scenario. For example, when performing SU-MIMO communication, if the network transmits beam signals to a terminal device, then beam signals of all frequency bands need to point towards that terminal, i.e., the beam signals need to be in a first state. When performing MU-MIMO communication, if the network transmits beam signals to multiple terminal devices, then beam signals of different frequency bands need to point towards the corresponding terminals, i.e., the beam signals need to be in a second state.

[0135] Optionally, based on the broadband communication scenario, the target state of the beam signal output by the RIS array is determined, including:

[0136] If the broadband communication scenario is a single-user multiple-input multiple-output (SU-MIMO) scenario, then the target state is determined to be the first state; or, if the broadband communication scenario is a multiple-user multiple-input multiple-output (MU-MIMO) scenario, then the target state is determined to be the second state.

[0137] In the first state, depending on the communication scenario to be executed, the true delay control module is controlled to apply a specific delay or perform phase shift processing on the beam signals of each frequency band, so that they are transmitted towards the same terminal direction, thereby realizing SU-MIMO communication.

[0138] In the second state, the frequency band of the beam signal corresponds to the terminal. When the network needs to transmit beam signals to multiple terminals, frequency bands need to be allocated to each terminal. Different terminals are assigned to receive signals of different frequency bands to avoid interference between the received signals of different terminals. Depending on the communication scenario to be executed, the true delay control module is controlled to apply a specific delay to the beam signal or perform phase shift processing, so that beam signals of different frequency bands are transmitted towards the corresponding terminal direction, realizing MU-MIMO communication.

[0139] In the embodiments of this application, by controlling the true delay control module to apply a time delay or perform phase shift processing on the beam signal input to the RIS array, the aperture effect caused by beam signal distortion and other factors can be effectively avoided, thereby ensuring communication quality. By controlling the beam signal in different frequency bands according to different communication scenarios, SU-MIMO or MU-MIMO communication can be achieved.

[0140] As an optional embodiment, controlling the true delay control module to apply a time delay to the beam signal input to the RIS array according to the target state includes:

[0141] Step 1: If the target state is the first state, establish an initial communication link;

[0142] Step 2: Determine the true delay compensation target for optimizing the initial communication link;

[0143] Optionally, determining the true delay compensation target for optimizing the initial communication link includes: generating codewords corresponding to the center frequency points of different frequency bands based on the angular domain information of the beam signal; and determining the codewords as the true delay compensation target.

[0144] In this embodiment, the network side can calculate the codeword generated by the center frequency point corresponding to the pre-divided sub-bands based on the beam angle domain information, and use the codeword as the optimization target for true delay compensation.

[0145] Step 3: Determine the true delay control matrix that minimizes the mean square error of the true delay compensation target;

[0146] Step 4: Determine the time delay to be applied to the beam signal of each frequency band based on the relationship between the true time delay control matrix and the center frequency of each frequency band;

[0147] Step 5: Control the true delay device of the true delay control module to apply the corresponding delay to the RIS subarray corresponding to the beam signal of each frequency band.

[0148] Optionally, before applying the corresponding time delay to the RIS subarray corresponding to the beam signal of each frequency band, the method further includes: generating initial beamforming codewords corresponding to the beam signals of different frequency bands based on the beam information of the center frequency point of each frequency band; and assigning the initial beamforming codewords to the RIS subarray corresponding to the beam signal.

[0149] In this embodiment, the broadband system is as follows: Figure 1 or Figure 2 As shown, the RIS subarray transmits the beam signal sent from the network side to the terminal through transmission or reflection. For Figure 1 When the beam signal is transmitted through the first true delay device, the first true delay device applies a time delay to the beam signal; for Figure 2 The second true delay device applies a time delay to the beam signal input to the RIS array through the first control circuit. Specifically, during SU-MIMO communication, all frequency band beam signals need to point to the same terminal, i.e., to achieve the first state.

[0150] When performing SU-MIMO communication, the application of time delay by the first or second true delay device to the beam signal may specifically include: firstly, the network side establishes a preliminary stable communication link at the center frequency point using methods such as RIS codebook scanning, i.e., the initial communication link; then, beam adjustment is performed based on this initial communication link. A true delay compensation target for adjustment can be determined, which is the desired compensation target for the initial communication link. Before beam adjustment, the network side can generate an initial beamforming codeword corresponding to the center frequency beam using the beam information at the center frequency point (e.g., angle information measured by scanning, angular domain information corresponding to a preset codebook, etc.), and assign it as the beamforming matrix of the RIS to the RIS, thereby realizing beamforming of the RIS array.

[0151] Based on the scale of the divided RIS array, and under the constraint that all RIS subarrays in the RIS array share a single set of true delay devices, the network side can use algorithms such as convex optimization to calculate the true delay control matrix that minimizes the mean square error relative to the true delay compensation target. This true delay control matrix includes the control delay corresponding to each RIS subarray. Applying the true delay using the true delay control matrix that minimizes the mean square error relative to the true delay compensation target ensures that the aperture effects caused by beam distortion are minimized after adjusting the beam signal.

[0152] Based on the relationship between the true delay control matrix and the center frequency of each sub-band, the required delay of the true delay device for each RIS sub-array can be determined, thereby allowing for separate control of the beam signals transmitted to each RIS sub-array, ensuring that all broadband beams in all frequency bands are aligned with the same user. Optionally, the relationship between the true delay control matrix and the center frequency of each sub-band may include: spatial domain relationships (such as angular relationships).

[0153] As another optional embodiment, according to the target state, the true delay control module is controlled to perform phase shifting processing on the beam signal input to the RIS array, including:

[0154] Step 1: If the target state is the first state, establish an initial communication link;

[0155] Step 2: For the center frequency of different frequency bands, determine the phase shift value corresponding to each second control circuit;

[0156] Step 3: Perform phase shift processing on each of the second control circuits according to the phase shift value.

[0157] In this embodiment, the broadband system is as follows: Figure 3 As shown, the RIS subarray transmits the beam signal sent from the network side to the terminal via reflection. When the beam signal is transmitted to the RIS subarray, the controller performs frequency band filtering and phase shifting on the beam signal by controlling the bandpass filter and phase shift controller, thereby achieving frequency band control of the beam signal. Specifically, during SU-MIMO communication, all frequency band beam signals need to point to the same terminal, i.e., achieving the first state.

[0158] When performing SU-MIMO communication, the controller's adjustment of the beam signal may specifically include: firstly, the network side establishes a preliminary stable communication link at the center frequency point using methods such as RIS codebook scanning, i.e., the initial communication link; then, beam adjustment is performed based on this initial communication link. The network side uses the beam information at the center frequency point (e.g., angle information measured by scanning, angular domain information corresponding to a preset codebook) to directly calculate the phase shift value corresponding to each second control circuit at the center frequency point of different sub-frequency bands, under the constraint of RIS subarray conditions, using approximation methods or convex optimization. Each second control circuit adjusts the beam signal of its corresponding RIS subarray, achieving broadband beam alignment of different frequency bands to the same user.

[0159] As another optional embodiment, according to the target state, the true delay control module is controlled to perform phase shifting processing on the beam signal input to the RIS array, including:

[0160] Step 1: If the target state is the second state, allocate bandwidth to different terminals;

[0161] Step 2: Determine the RIS phase shift matrix corresponding to each terminal based on the relevant information of each terminal and the bandwidth corresponding to the terminal; the relevant information of the terminal may include: the terminal's position information and / or angular domain information.

[0162] Step 3: Perform phase shifting processing on each second control circuit according to the RIS phase shift matrix.

[0163] In this embodiment, the broadband system is as follows: Figure 3 As shown, the RIS subarray transmits the beam signal sent from the network side to the terminal via reflection. When the beam signal is transmitted to the RIS subarray, the controller filters the frequency bands of the beam signal and performs phase shifting by controlling the bandpass filter and phase shift controller, thereby achieving frequency band control of the beam signal. Specifically, during MU-MIMO communication, beam signals of different frequency bands need to point to the corresponding terminals, thus achieving the second state.

[0164] When performing MU-MIMO communication, the network side allocates different bandwidths (different numbers of sub-bands) to multiple terminals according to parameters such as communication quality requirements. Optionally, a terminal may correspond to one or more adjacent sub-bands for easy control, but spatially adjacent terminals may be allocated more distant sub-bands to reduce mutual interference.

[0165] The network side calculates the RIS phase shift matrix corresponding to each terminal based on the location or angular domain information of each terminal and the allocated sub-bands. Then, it assigns the corresponding values ​​to the controller of each control circuit according to the RIS phase shift matrix, so as to realize MU-MIMO communication of different frequency band beam signals to different users.

[0166] In this embodiment, by performing phase-shifting processing on the second control circuit, the equivalent effect of applying a time delay to the beam signal by the true time-delay device can be achieved, which can also effectively solve the aperture effect problem and ensure communication quality.

[0167] In the embodiments of this application, the RIS array is combined with a true delay control module. By applying a time delay or performing phase shift processing on the beam signal input to the RIS array through the true delay control module, the aperture effect caused by beam signal distortion and other situations can be effectively avoided, thereby ensuring communication quality. The reasoning process is explained below.

[0168] The channels for millimeter-wave and higher frequency terahertz communication primarily conform to the RICIAN model, a channel model dominated by line-of-sight (LOS) paths and with a smaller number of non-line-of-sight (NLOS) paths. This represents the steering vector at the receiving or transmitting end.

[0169]

[0170] in,

[0171] Among them, C kl f is the complex gain of the l-th path in the k-th cluster. d For Doppler frequency shift, w kl The Doppler angle is related to the angle of the receiving array. α in a broadband scenario. k,l , All are frequency-dependent. H(t) represents the time-domain channel, K represents the number of clusters, L represents the number of paths in each cluster, and α k,l Let represent the complex coefficient of the l-th path of the k-th cluster. This represents the U-direction angle between the k-th cluster and the l-th diameter of the receiver and the array surface. This represents the U-direction angle between the k-th cluster and the l-th diameter of the transmitter and the array surface; This represents the angle between the k-th cluster and the l-th diameter of the receiver and the array surface in the V direction. It represents the V-direction angle between the k-th cluster and the l-th diameter of the transmitter and the array surface.

[0172] Assume the center frequency is f c The baseband frequency is f, the number of linear array elements is M, and the spacing is half the wavelength of the center frequency λ. c Then the array gain can be expressed as:

[0173]

[0174] Here, ψ0 refers to the phase angle of the spatial distance based on the wavelength of the center frequency point.

[0175] The normalized phase angle ψ0 can be obtained from the following equation:

[0176] ψ0=dsinν0 / λ c

[0177] Where d is the element spacing and ν0 is the angle.

[0178] Adding a true delay to the array, the time-domain response of the m-th element can be expressed as:

[0179]

[0180] Among them, t m ψ is the delay provided by the true delay line for the m-th unit. real This refers to the actual assigned phase angle; δ() is the impulse response function.

[0181] Transforming the time-domain response of the m-th element above into the frequency domain, we obtain the following frequency-domain response:

[0182]

[0183] Among them, g m This is the frequency domain response.

[0184] For RIS units, an additional term, the normalized phase, can be adjusted in the above equation. The above frequency domain response formula can then be extended to:

[0185]

[0186] It is the phase that can be controlled by the RIS unit.

[0187] The array gain at baseband frequency f can be denoted as:

[0188]

[0189] Where a is the array response, Ξ l (f) represents a function related to f, here indicating the function of the true delay modulation part; g l (f) denotes a function related to f, here indicating the function of the RIS phase shift matrix control portion; ψ l The angle corresponding to the l-th path is the starting angle based on the center frequency wavelength, which is the equivalent phase angle that equates the unit spacing to the angle domain.

[0190] make:

[0191]

[0192]

[0193] The array gain at baseband frequency f can be denoted as:

[0194]

[0195] Therefore, from the perspective of ContolMatrix, the above equation can be decomposed as:

[0196]

[0197] That is, the above array can be decomposed into the Hadamard product of the RIS phased array (i.e., RISMatrix) which is related to the controllable phase and the true delay matrix (i.e., TDDMatrix) which is related to time (delay). In other words, true delay control can be achieved on the RIS, thereby achieving the purpose of broadband communication.

[0198] The embodiments of this application combine a RIS array with a true delay control module to apply a time delay or perform phase shifting on the input beam signal, achieving true delay-based control. This effectively solves the aperture effect problem and ensures communication quality. By performing frequency-band control of the beam signal according to different communication scenarios, SU-MIMO or MU-MIMO communication can be achieved, realizing frequency-band control of the beam signal.

[0199] The above embodiments describe the control method of the broadband communication system of the present invention. The following embodiments will further describe the corresponding devices in conjunction with the accompanying drawings.

[0200] Specifically, such as Figure 5 As shown, an embodiment of the present invention provides a control device 500 for a broadband communication system, comprising:

[0201] The first determining unit 510 is used to determine the target state of the beam signal output by the RIS array according to the broadband communication scenario.

[0202] The first control unit 520 is configured to control the true delay control module to apply a time delay or perform phase shift processing on the beam signal input to the RIS array according to the target state.

[0203] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0204] Optionally, the first determining unit is specifically used for:

[0205] If the broadband communication scenario is a single-user multiple-input multiple-output scenario, then the target state is determined to be the first state;

[0206] or,

[0207] If the broadband communication scenario is a multi-user, multi-input, multi-output scenario, then the target state is determined to be the second state.

[0208] Optionally, the first control unit includes:

[0209] The first establishment subunit is used to establish an initial communication link when the target state is the first state;

[0210] The first determining subunit is used to determine the true delay compensation target for optimizing the initial communication link;

[0211] The second determining subunit is used to determine the true delay control matrix that minimizes the mean square error with the true delay compensation target;

[0212] The third determining subunit is used to determine the time delay to be applied to the beam signal of each frequency band based on the relationship between the true time delay control matrix and the center frequency point of each frequency band.

[0213] The first control subunit is used to control the true delay device of the true delay control module to apply the corresponding delay to the RIS subarray corresponding to the beam signal of each frequency band.

[0214] Optionally, the device further includes:

[0215] The codeword generation unit is used to generate initial beamforming codewords corresponding to beam signals of different frequency bands based on the beam information of the center frequency point of each frequency band.

[0216] The beamforming unit is used to assign the initial beamforming codeword to the RIS subarray corresponding to the beam signal.

[0217] Optionally, the first determining subunit is specifically used for:

[0218] Based on the angular domain information of the beam signal, codewords corresponding to the center frequency points of different frequency bands are generated;

[0219] The codeword is determined as the true delay compensation target.

[0220] Optionally, the first control unit includes:

[0221] The first establishment subunit is used to establish an initial communication link when the target state is the first state;

[0222] The fourth determining subunit is used to determine the phase shift value corresponding to each second control circuit for the center frequency point of different frequency bands;

[0223] The first processing subunit is used to perform phase shift processing on each of the second control circuits according to the phase shift value.

[0224] Optionally, the first control unit includes:

[0225] The allocation subunit is used to allocate bandwidth to different terminals when the target state is the second state.

[0226] The fifth determining subunit is used to determine the RIS phase shift matrix corresponding to each terminal based on the relevant information of each terminal and the bandwidth corresponding to the terminal.

[0227] The second determining subunit is used to perform phase shifting processing on each of the second control circuits according to the RIS phase shift matrix.

[0228] It should be noted that the apparatus provided in this embodiment of the invention can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0229] It should be noted that the division of units in the embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0230] If the integrated unit is implemented as 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 this application, in essence, 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. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0231] like Figure 6 As shown, an embodiment of the present invention also provides a control device for a broadband communication system, including: a memory 620, a transceiver 600, and a processor 610; wherein, the memory 620 is used to store a computer program; the transceiver 600 is used to receive and send data under the control of the processor 610; and the processor 610 is used to read the computer program in the memory and perform the following operations:

[0232] Based on the broadband communication scenario, determine the target state of the beam signal output by the RIS array;

[0233] Based on the target state, the true delay control module is controlled to apply a time delay or perform phase shift processing on the beam signal input to the RIS array;

[0234] The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

[0235] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0236] If the broadband communication scenario is a single-user multiple-input multiple-output scenario, then the target state is determined to be the first state;

[0237] or,

[0238] If the broadband communication scenario is a multi-user, multi-input, multi-output scenario, then the target state is determined to be the second state.

[0239] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0240] If the target state is the first state, an initial communication link is established;

[0241] Determine the true delay compensation target for optimizing the initial communication link;

[0242] Determine the true delay control matrix that minimizes the mean square error relative to the true delay compensation target;

[0243] Based on the relationship between the true delay control matrix and the center frequency of each frequency band, the time delay to be applied to the beam signal of each frequency band is determined;

[0244] The true delay device of the true delay control module applies the corresponding delay to be applied to the RIS subarray corresponding to the beam signal of each frequency band.

[0245] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0246] Based on the beam information of the center frequency point of each frequency band, generate the initial beamforming codewords corresponding to the beam signals of different frequency bands;

[0247] The initial beamforming codeword is assigned to the RIS subarray corresponding to the beam signal.

[0248] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0249] Based on the angular domain information of the beam signal, codewords corresponding to the center frequency points of different frequency bands are generated;

[0250] The codeword is determined as the true delay compensation target.

[0251] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0252] If the target state is the first state, an initial communication link is established;

[0253] For the center frequency of different frequency bands, determine the phase shift value corresponding to each second control circuit;

[0254] Based on the phase shift value, phase shift processing is performed on each of the second control circuits.

[0255] Optionally, the processor is configured to read the computer program in the memory and perform the following operations:

[0256] When the target state is the second state, bandwidth is allocated to different terminals;

[0257] Based on the relevant information of each terminal and the bandwidth corresponding to the terminal, determine the RIS phase shift matrix corresponding to the terminal;

[0258] Each second control circuit is phase-shifted according to the RIS phase-shift matrix.

[0259] Among them, Figure 6 In this context, the bus architecture may include any number of interconnected buses and bridges, specifically linking various circuits together, represented by one or more processors (processor 610) and memory (memory 620). The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. A bus interface provides an interface. Transceiver 600 may be multiple elements, including transmitters and transceivers, providing a unit for communicating with various other devices over a transmission medium. Processor 610 is responsible for managing the bus architecture and general processing, and memory 620 may store data used by processor 610 during operation.

[0260] The processor 610 can 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 can also adopt a multi-core architecture.

[0261] It should be noted that the apparatus provided in this embodiment of the invention can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Therefore, the parts and beneficial effects that are the same as those in the method embodiment will not be described in detail here.

[0262] In addition, specific embodiments of the present invention also provide a processor-readable storage medium storing a computer program thereon. When executed by a processor, this program implements the steps of the control method for the broadband communication system described above, achieving the same technical effect. To avoid repetition, further details are omitted here. The readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs), etc.).

[0263] It should be noted that the technical solutions provided in this application are applicable to a variety of systems, especially 5G systems. For example, applicable systems may include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and 5G New Radio (NR). All of these systems include terminal equipment and network equipment. The systems may also include a core network component, such as Evolved Packet System (EPS) and 5G system (5GS).

[0264] The terminal devices involved in the embodiments of this application can be devices that provide voice and / or data connectivity to users, handheld devices with wireless connectivity, or other processing devices connected to a wireless modem. The names of the terminal devices may differ in different systems; for example, in a 5G system, a terminal device can be called User Equipment (UE). Wireless terminal devices can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, for example, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices that exchange voice and / or data with the RAN. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, and Personal Digital Assistants (PDAs). Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but is not limited to these terms in the embodiments of this application.

[0265] The network device involved in this application embodiment can be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, a base station may also be called an access point, or a device in an access network that communicates with a wireless terminal device through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also coordinate the attribute management of the air interface. For example, the network equipment involved in the embodiments of this application can be a base transceiver station (BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a NodeB in a Wide-band Code Division Multiple Access (WCDMA) system, an evolved Node B (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiments of this application. In some network structures, the network equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may be geographically separated.

[0266] 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 multiple-user MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, and can also be diversity transmission, precoding transmission, or beamforming transmission, etc.

[0267] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take 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) containing computer-usable program code.

[0268] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more blocks of the flowchart illustrations and / or one or more blocks of the block diagrams.

[0269] These processor-executable instructions may also be stored in a processor-readable memory that can instruct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more blocks of a block diagram.

[0270] These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of a block diagram.

[0271] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A broadband communication system, characterized in that, include: A reconfigurable smart surface RIS array, wherein the RIS array comprises multiple RIS subarrays; A true time delay control module is used to apply a time delay or perform phase shift processing on the beam signal input to the RIS array so that the beam signal output by the RIS array is in the target state. The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

2. The broadband communication system according to claim 1, characterized in that, In the second state, the frequency band of the beam signal corresponds to the terminal.

3. The broadband communication system according to claim 1, characterized in that, The true delay control module includes: Feed source, each of the feed sources corresponds to one of the RIS subarrays; The first true delay device is connected to the feed source via a true delay line. The first true delay device controls the feed source to emit electromagnetic waves to the corresponding RIS subarray via the true delay line.

4. The broadband communication system according to claim 1, characterized in that, The true delay control module includes: Second true delay device; A first control circuit, one end of which is connected to the second true delay device, and the other end of which is connected to the RIS subarray.

5. The broadband communication system according to claim 4, characterized in that, The broadband communication system further includes: a reflective element; The second true delay device and the first control circuit are disposed on the first side of the reflective element, and the RIS array is disposed on the second side of the reflective element.

6. The broadband communication system according to claim 1, characterized in that, The true delay control module includes: Controller; A second control circuit is provided, through which the controller is connected to the RIS array. Each of the RIS subarrays is connected to N second control circuits, and the N second control circuits are connected in parallel; each second control circuit includes a bandpass filter and a phase shift controller. N is a positive integer greater than or equal to 2.

7. The broadband communication system according to claim 6, characterized in that, The bandpass filter and the phase shift controller are connected in series; The bandpass filter is connected to the first end of the RIS subarray, and the phase shift controller is connected to the second end of the RIS subarray.

8. A control method for a broadband communication system, applied to the broadband communication system according to any one of claims 1 to 7, characterized in that, include: Based on the broadband communication scenario, determine the target state of the beam signal output by the RIS array; Based on the target state, the true delay control module is controlled to apply a time delay or perform phase shift processing on the beam signal input to the RIS array; The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

9. The method according to claim 8, characterized in that, Based on the broadband communication scenario, determine the target state of the beam signal output by the RIS array, including: If the broadband communication scenario is a single-user multiple-input multiple-output scenario, then the target state is determined to be the first state; If the broadband communication scenario is a multi-user, multi-input, multi-output scenario, then the target state is determined to be the second state.

10. The method according to claim 8, characterized in that, The step of controlling the true delay control module to apply a time delay to the beam signal input to the RIS array according to the target state includes: If the target state is the first state, an initial communication link is established; Determine the true delay compensation target for optimizing the initial communication link; Determine the true delay control matrix that minimizes the mean square error relative to the true delay compensation target; Based on the relationship between the true delay control matrix and the center frequency of each frequency band, the time delay to be applied to the beam signal of each frequency band is determined; The true delay device of the true delay control module applies the corresponding delay to be applied to the RIS subarray corresponding to the beam signal of each frequency band.

11. The method according to claim 10, characterized in that, Before applying the corresponding time delay to the RIS subarray corresponding to the beam signal of each frequency band, the method further includes: Based on the beam information of the center frequency point of each frequency band, generate the initial beamforming codewords corresponding to the beam signals of different frequency bands; The initial beamforming codeword is assigned to the RIS subarray corresponding to the beam signal.

12. The method according to claim 10, characterized in that, The determination of the true delay compensation target for optimizing the initial communication link includes: Based on the angular domain information of the beam signal, codewords corresponding to the center frequency points of different frequency bands are generated; The codeword is determined as the true delay compensation target.

13. The method according to claim 8, characterized in that, Based on the target state, the true delay control module is controlled to perform phase shifting processing on the beam signal input to the RIS array, including: If the target state is the first state, an initial communication link is established; For the center frequency of different frequency bands, determine the phase shift value corresponding to each second control circuit; Based on the phase shift value, phase shift processing is performed on each of the second control circuits.

14. The method according to claim 8, characterized in that, Based on the target state, the true delay control module is controlled to perform phase shifting processing on the beam signal input to the RIS array, including: When the target state is the second state, bandwidth is allocated to different terminals; Based on the relevant information of each terminal and the bandwidth corresponding to the terminal, determine the RIS phase shift matrix corresponding to the terminal; Each second control circuit is phase-shifted according to the RIS phase-shift matrix.

15. A control device for a broadband communication system, characterized in that, include: Memory, transceiver, processor: Memory, used to store computer programs; A transceiver, used to receive and send data under the control of the processor; Processor, configured to read the computer program in the memory and perform the following operations: Based on the broadband communication scenario, determine the target state of the beam signal output by the RIS array; Based on the target state, the true delay control module is controlled to apply a time delay or perform phase shift processing on the beam signal input to the RIS array; The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

16. The apparatus according to claim 15, characterized in that, The processor is used to read the computer program in the memory and perform the following operations: If the broadband communication scenario is a single-user multiple-input multiple-output scenario, then the target state is determined to be the first state; If the broadband communication scenario is a multi-user, multi-input, multi-output scenario, then the target state is determined to be the second state.

17. The apparatus according to claim 15, characterized in that, The processor is used to read the computer program in the memory and perform the following operations: If the target state is the first state, an initial communication link is established; Determine the true delay compensation target for optimizing the initial communication link; Determine the true delay control matrix that minimizes the mean square error relative to the true delay compensation target; Based on the relationship between the true delay control matrix and the center frequency of each frequency band, the time delay to be applied to the beam signal of each frequency band is determined; The true delay device of the true delay control module applies the corresponding delay to be applied to the RIS subarray corresponding to the beam signal of each frequency band.

18. The apparatus according to claim 17, characterized in that, The processor is used to read the computer program in the memory and perform the following operations: Based on the beam information of the center frequency point of each frequency band, generate the initial beamforming codewords corresponding to the beam signals of different frequency bands; The initial beamforming codeword is assigned to the RIS subarray corresponding to the beam signal.

19. The apparatus according to claim 17, characterized in that, The processor is used to read the computer program in the memory and perform the following operations: Based on the angular domain information of the beam signal, codewords corresponding to the center frequency points of different frequency bands are generated; The codeword is determined as the true delay compensation target.

20. The apparatus according to claim 15, characterized in that, The processor is used to read the computer program in the memory and perform the following operations: If the target state is the first state, an initial communication link is established; For the center frequency of different frequency bands, determine the phase shift value corresponding to each second control circuit; Based on the phase shift value, phase shift processing is performed on each of the second control circuits.

21. The apparatus according to claim 15, characterized in that, The processor is used to read the computer program in the memory and perform the following operations: When the target state is the second state, bandwidth is allocated to different terminals; Based on the relevant information of each terminal and the bandwidth corresponding to the terminal, determine the RIS phase shift matrix corresponding to the terminal; Each second control circuit is phase-shifted according to the RIS phase-shift matrix.

22. A control device for a broadband communication system, characterized in that, include: The first determining unit is used to determine the target state of the beam signal output by the RIS array based on the broadband communication scenario. The first control unit is configured to control the true delay control module to apply a time delay or perform phase shift processing on the beam signal input to the RIS array according to the target state. The target state includes a first state and a second state. In the first state, beam signals of all frequency bands point to the same terminal direction. In the second state, beam signals of different frequency bands point to different terminal directions.

23. A processor-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the broadband communication system as described in any one of claims 8 to 14.

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