Signal transmission method and device, equipment and medium

Abstract

The invention provides a signal transmission method and device, equipment and a medium. The method comprises the following steps: acquiring first channel feature information between a first base station and an RIS, second channel feature information between the RIS and a terminal, and third channel feature information between the first base station and the terminal; performing phase adjustment on the RIS and the first base station according to the first channel feature information, the second channel feature information and the third channel feature information to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station; sending first indication information to the RIS; transmitting the first communication signal and the second communication signal to the terminal based on the second phase information; the phase of the first communication signal which is not forwarded to the terminal by the RIS and the phase of the second communication signal which is forwarded to the terminal by the RIS are at least partially superposed. According to the invention, by using the phase reconstruction of the RIS, the corresponding signal quality can be enhanced after the communication signal sent by the donor base station reaches the low-altitude terminal, and the interference of other signals from the second base station serving as the interference base station is avoided.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a signal transmission method, device, equipment and medium. Background Art

[0002] With the rapid development of communication technology, the demand for communication is no longer limited to communication between people on the ground. With the rapid development and maturity of civil drone technology, the improvement of autonomous driving, hovering, and obstacle avoidance technologies, and the improvement of drone video processing technology, drone applications have gradually expanded from line-of-sight applications to beyond-line-of-sight applications, and from the consumer field to inspection, agriculture, logistics, security and other industries. While the drone industry is developing rapidly, it has also put forward new demands on drone communication links, showing a development trend of close integration with cellular mobile communication technology to form "networked drones."

[0003] However, traditional communication network planning still takes downward coverage to meet the communication needs of people on the ground and in buildings as the basic demand. Base stations are generally equipped with prefabricated downtilt angles so that the main beam of the base station is directed below the horizontal plane. The network coverage at low altitude mainly uses the solution of grating lobes of base station antennas to take coverage into consideration. Under this solution, whether there are grating lobes at the desired location and the signal quality of the grating lobes are completely uncontrollable. The limited energy of the grating lobes limits the height of low-altitude coverage, and the aircraft will be out of coverage if it flies a little higher. At the same time, it is also possible that grating lobes from different base stations at the same location at low altitude will interfere with the signals at these locations, causing the signal quality to be severely reduced and unable to meet the low-altitude coverage requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a signal transmission method, device, equipment and medium to solve the problem of poor communication signal quality caused by signal interference when a low-altitude terminal communicates under the coverage of an existing network.

[0005] In order to achieve the above object, in a first aspect, the present invention provides a signal transmission method, applied to a first base station, comprising:

[0006] Acquire first channel characteristic information between the first base station and the intelligent supersurface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal;

[0007] According to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information, phase adjustment is performed on the RIS and the first base station to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station;

[0008] Sending first indication information to the RIS, where the first indication information is used to instruct the RIS to forward a signal according to the first phase information;

[0009] Based on the second phase information, a first communication signal and a second communication signal are sent to the terminal; wherein the phase of the first communication signal after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after reaching the terminal after being forwarded by the RIS.

[0010] The first channel characteristic information is the first channel matrix between the first base station and the RIS; the second channel characteristic information is the second channel matrix between the RIS and the terminal; and the third channel characteristic information is the third channel matrix between the first base station and the terminal.

[0011] The step of performing phase adjustment on the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station includes:

[0012] Obtaining a first target matrix according to the first channel matrix, the second channel matrix, the third channel matrix, a weight matrix of the RIS, and a precoding matrix of the first base station, wherein the weight matrix reflects phase information of the RIS, and the precoding matrix of the first base station reflects phase information of the first base station;

[0013] Based on the first target matrix, the weight matrix of the RIS and the precoding matrix of the first base station are alternately adjusted to obtain a first weight matrix and a first precoding matrix corresponding to when the first target matrix takes a maximum value, wherein the first weight matrix serves as the first phase information and the first precoding matrix serves as the second phase information.

[0014] The step of obtaining the second channel characteristic information between the RIS and the terminal includes:

[0015] Sending first codebook information to the RIS, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS;

[0016] Sending a first pilot signal to the terminal through forwarding by the RIS, wherein a first outgoing beam used by the RIS when forwarding the first pilot signal is generated based on the first codebook information;

[0017] receiving a first measurement result fed back by the terminal after performing channel measurement based on the first pilot signal;

[0018] A second channel matrix between the RIS and the terminal is obtained based on the first measurement result.

[0019] Wherein, the method further comprises:

[0020] Configure multiple codebook information for the RIS, and perform the following processing for each of the multiple codebook information to obtain multiple second measurement results:

[0021] Sending the codebook information to the RIS;

[0022] Sending a reference signal to the terminal through forwarding by the RIS, wherein an outgoing beam used by the RIS when forwarding the reference signal is generated based on the codebook information;

[0023] receiving a second measurement result fed back by the terminal after performing beam measurement based on the reference signal;

[0024] The codebook information corresponding to the target measurement result is determined as the first codebook information, wherein the target measurement result is the second measurement result corresponding to the strongest signal quality among the plurality of second measurement results.

[0025] The RIS is located at a position corresponding to a maximum synchronization signal block SSB scanning angle of the first base station.

[0026] In a second aspect, the present invention further provides a signal transmission method, applied to a second base station, comprising:

[0027] Acquire second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal;

[0028] Receiving first phase information sent by the RIS;

[0029] Performing phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station;

[0030] Based on the third phase information, a third communication signal and a fourth communication signal are sent to the terminal; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal through the RIS at least partially.

[0031] Among them, the second channel characteristic information is the second channel matrix between the RIS and the terminal; the fourth channel characteristic information is the fourth channel matrix between the second base station and the RIS; the fifth channel characteristic information is the fifth channel matrix between the second base station and the terminal; and the first phase information is the weight matrix of the RIS.

[0032] The step of performing phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information, and the first phase information to obtain third phase information corresponding to the second base station includes:

[0033] Obtaining a second target matrix according to the second channel matrix, the fourth channel matrix, the fifth channel matrix, the weight matrix of the RIS, and the precoding matrix of the second base station, wherein the weight matrix reflects the phase information of the RIS, and the precoding matrix of the second base station reflects the phase information of the second base station;

[0034] Based on the second target matrix, the precoding matrix of the second base station is adjusted to obtain a second precoding matrix corresponding to a value that minimizes the second target matrix, wherein the second precoding matrix serves as the third phase information.

[0035] In a third aspect, the present invention further provides a signal transmission method, which is applied to a smart metasurface, comprising:

[0036] Receiving first indication information sent by a first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information;

[0037] Sending the first phase information to a second base station;

[0038] Based on the first phase information, forwarding the second communication signal sent by the first base station; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal;

[0039] Based on the first phase information, the fourth communication signal sent by the second base station is forwarded; wherein the phase of the third communication signal sent by the second base station after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS.

[0040] Wherein, the method further comprises:

[0041] receiving first codebook information sent by the first base station, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS;

[0042] The first pilot signal from the first base station is forwarded to the terminal by using a first outgoing beam generated based on the first codebook information.

[0043] Wherein, the method further comprises:

[0044] Receiving any one of the codebook information among the multiple codebook information sent by the first base station;

[0045] The reference signal from the first base station is forwarded to the terminal by using an outgoing beam generated based on the codebook information.

[0046] In a fourth aspect, the present invention further provides a signal transmission method, applied to a terminal, comprising:

[0047] Receiving a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and an intelligent metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS;

[0048] A third communication signal and a fourth communication signal sent by the second base station are received through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and a phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets a phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0049] Wherein, the method further comprises:

[0050] receiving, through forwarding by the RIS, a first pilot signal from the first base station;

[0051] Perform channel measurement based on the first pilot signal to obtain a first measurement result;

[0052] The first measurement result is fed back to the first base station.

[0053] Wherein, the method further comprises:

[0054] receiving a reference signal from the first base station through forwarding by the RIS;

[0055] Perform beam measurement based on the reference signal to obtain a second measurement result;

[0056] The second measurement result is fed back to the first base station.

[0057] In a fifth aspect, the present invention further provides a signal transmission device, comprising:

[0058] A first acquisition module is used to acquire first channel characteristic information between the first base station and the intelligent super surface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal;

[0059] A first processing module, configured to perform phase adjustment on the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information, to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station;

[0060] A first sending module, configured to send first indication information to the RIS, wherein the first indication information is used to instruct the RIS to forward a signal according to the first phase information;

[0061] A second sending module is used to send a first communication signal and a second communication signal to the terminal based on the second phase information; wherein the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS.

[0062] In a sixth aspect, the present invention further provides a base station, the base station being a first base station, comprising a processor and a transceiver, the transceiver receiving and sending data under the control of the processor, and the processor being configured to perform the following operations:

[0063] Acquire first channel characteristic information between the first base station and the intelligent supersurface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal;

[0064] According to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information, phase adjustment is performed on the RIS and the first base station to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station;

[0065] Sending first indication information to the RIS, where the first indication information is used to instruct the RIS to forward a signal according to the first phase information;

[0066] Based on the second phase information, a first communication signal and a second communication signal are sent to the terminal; wherein the phase of the first communication signal after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after reaching the terminal after being forwarded by the RIS.

[0067] In the seventh aspect, the present invention also provides a base station, which is a first base station, comprising a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the signal transmission method as described in the first aspect above.

[0068] In an eighth aspect, the present invention further provides a signal transmission device, comprising:

[0069] A second acquisition module is used to acquire second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal;

[0070] A first receiving module, used for receiving first phase information sent by the RIS;

[0071] A second processing module, configured to perform phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information, to obtain third phase information corresponding to the second base station;

[0072] A third sending module is used to send a third communication signal and a fourth communication signal to the terminal based on the third phase information; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS.

[0073] In a ninth aspect, the present invention further provides a base station, the base station being a second base station, comprising a processor and a transceiver, the transceiver receiving and sending data under the control of the processor, and the processor being configured to perform the following operations:

[0074] Acquire second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal;

[0075] Receiving first phase information sent by the RIS;

[0076] Performing phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station;

[0077] Based on the third phase information, a third communication signal and a fourth communication signal are sent to the terminal; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal through the RIS at least partially.

[0078] In the tenth aspect, the present invention also provides a base station, which is a second base station, comprising a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the signal transmission method as described in the second aspect above.

[0079] In an eleventh aspect, the present invention further provides a signal transmission device, comprising:

[0080] A second receiving module is used to receive first indication information sent by the first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information;

[0081] A fourth sending module, configured to send the first phase information to a second base station;

[0082] A first forwarding module, configured to forward a second communication signal sent by the first base station based on the first phase information; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal;

[0083] A second forwarding module is used to forward the fourth communication signal sent by the second base station based on the first phase information; wherein the phase of the third communication signal sent by the second base station after arriving at the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0084] In a twelfth aspect, the present invention further provides a smart metasurface, comprising a processor and a transceiver, wherein the transceiver receives and sends data under the control of the processor, and the processor is used to perform the following operations:

[0085] Receiving first indication information sent by a first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information;

[0086] Sending the first phase information to a second base station;

[0087] Based on the first phase information, forwarding the second communication signal sent by the first base station; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal;

[0088] Based on the first phase information, the fourth communication signal sent by the second base station is forwarded; wherein the phase of the third communication signal sent by the second base station after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS.

[0089] In the thirteenth aspect, the present invention also provides an intelligent metasurface, comprising a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, the signal transmission method as described in the third aspect above is implemented.

[0090] In a fourteenth aspect, the present invention further provides a signal transmission device, comprising:

[0091] A third receiving module is used to receive a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and the smart metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS;

[0092] The fourth receiving module is used to receive the third communication signal and the fourth communication signal sent by the second base station through the second direct communication channel between the second base station and the terminal and the second forwarding channel between the second base station and the terminal, respectively, wherein the second forwarding channel includes the channel between the second base station and the RIS and the channel between the RIS and the terminal, and the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0093] In a fifteenth aspect, the present invention further provides a terminal, including a processor and a transceiver, wherein the processor is configured to execute the following process:

[0094] Receiving a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and an intelligent metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS;

[0095] A third communication signal and a fourth communication signal sent by the second base station are received through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and a phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets a phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0096] In the sixteenth aspect, the present invention also provides a terminal, comprising a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, the signal transmission method as described in the fourth aspect above is implemented.

[0097] In the seventeenth aspect, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the signal transmission method as described in the first aspect above, implements the steps in the signal transmission method as described in the second aspect above, or implements the steps in the signal transmission method as described in the third aspect above, or implements the steps in the signal transmission method as described in the fourth aspect above.

[0098] The above technical solution of the present invention has at least the following beneficial effects:

[0099] In an embodiment of the present invention, a smart metasurface receives first indication information sent by a first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to first phase information; sends first phase information to a second base station; forwards a second communication signal sent by the first base station based on the first phase information; wherein the phase of the first communication signal sent by the first base station after arriving at the terminal without being forwarded by RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by RIS; forwards a fourth communication signal sent by the second base station based on the first phase information; wherein the phase of the third communication signal sent by the second base station after arriving at the terminal without being forwarded by RIS is at least partially offset with the phase of the fourth communication signal after arriving at the terminal after being forwarded by RIS. Through the above processing, using the phase reconstruction of RIS, the quality of the corresponding communication signal sent by the first base station as a donor base station can be enhanced after the communication signal arrives at the low-altitude terminal, thereby avoiding interference from other signals from the second base station as an interfering base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0100] Figure 1 A schematic diagram showing a flow chart of a signal transmission method provided by an embodiment of the present invention;

[0101] Figure 2 A schematic diagram showing the location of the RIS according to an embodiment of the present invention;

[0102] Figure 3 A second flowchart diagram showing a signal transmission method provided by an embodiment of the present invention;

[0103] Figure 4 A third flowchart diagram showing a signal transmission method provided by an embodiment of the present invention;

[0104] Figure 5 A fourth flowchart diagram showing a signal transmission method provided by an embodiment of the present invention;

[0105] Figure 6 A schematic diagram showing an application scenario of an embodiment of the present invention;

[0106] Figure 7 One of the module schematic diagrams showing the signal transmission device provided by the embodiment of the present invention;

[0107] Figure 8 A schematic diagram showing a hardware structure of a base station provided in an embodiment of the present invention;

[0108] Fig. 9 A second schematic diagram showing a module of a signal transmission device provided by an embodiment of the present invention;

[0109] Fig.10 The second schematic diagram shows the hardware structure of the base station provided in the embodiment of the present invention;

[0110] Fig.11 A third schematic diagram showing a module of a signal transmission device provided by an embodiment of the present invention;

[0111] Fig.12 A schematic diagram showing the hardware structure of the intelligent metasurface provided in an embodiment of the present invention;

[0112] Fig.13 A fourth schematic diagram showing a module of a signal transmission device provided in an embodiment of the present invention;

[0113] Fig.14 A schematic diagram showing the hardware structure of a terminal provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0114] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0115] There are currently two solutions to meet the coverage requirements of low-altitude communications. One is that the ground station directly covers the sky upwards, but this solution is essentially to build a network that only covers low altitudes. Although it can ensure the performance of the low-altitude network, it costs a lot. Moreover, if the millimeter wave frequency band is used, there is also the risk of the level above the horizontal plane exceeding the threshold and interfering with satellites, radars, etc.

[0116] Another solution is to forward the signal through a repeater and direct it upwards. However, this solution also has the problem that the beam is fixed and can only cover a specific area, beam tracking cannot be achieved, and the coverage range is small.

[0117] In order to solve the problem of poor communication signal quality caused by signal interference when a low-altitude terminal communicates under the coverage of an existing network, the present invention provides a signal transmission method, device, equipment and medium. The method and the device are based on the same application concept. Since the principles of solving the problem by the method and the device are similar, the implementation of the device and the method can refer to each other, and the repeated parts will not be repeated.

[0118] like Figure 1 FIG. 1 is a flow chart of a signal transmission method provided by the present invention. The method is applied to a first base station, where the first base station serves as a donor base station. The method may specifically include:

[0119] Step 101, obtaining first channel characteristic information between a first base station and an intelligent supersurface RIS, second channel characteristic information between the RIS and a terminal, and third channel characteristic information between the first base station and the terminal;

[0120] Here, the channel characteristic information is used to reflect the channel quality.

[0121] Optionally, the first channel characteristic information is a first channel matrix between the first base station and the RIS; the second channel characteristic information is a second channel matrix between the RIS and the terminal; and the third channel characteristic information is a third channel matrix between the first base station and the terminal.

[0122] The channel matrix can directly reflect the transmission characteristics of the channel, such as the multipath effect of the channel, signal attenuation, etc. By analyzing the channel matrix, the channel quality can be evaluated.

[0123] Optionally, the RIS is located at a position corresponding to the maximum synchronization signal block SSB scanning angle of the first base station. In other words, in order not to affect the original coverage effect of the base station, the deployment position of the RIS is located at the edge of the horizontal scanning range of the first base station (donor base station), that is, the RIS is located at a position corresponding to the maximum SSB scanning angle of the first base station.

[0124] The specific implementation method is: the existing base station usually uses N horizontal beams in parallel, such as the horizontal 8-beam solution, to achieve a horizontal coverage of 120°, see Figure 2 When RIS is covered, select the outermost beam, such as SSB1 or SSB8, and deploy RIS in the location covered by SSB1 or SSB8 beams. At the same time, set the background so that the beam does not participate in the SSB scanning of the base station and is fixedly pointed in the direction of RIS. The other N-1 SSB beams are scanned in the traditional way.

[0125] Step 102: performing phase adjustment on the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station;

[0126] In an optional embodiment, step 102 may specifically include:

[0127] Step 1021: Obtain a first target matrix according to the first channel matrix, the second channel matrix, the third channel matrix, the weight matrix of the RIS, and the precoding matrix of the first base station, wherein the weight matrix reflects the phase information of the RIS, and the precoding matrix of the first base station reflects the phase information of the first base station;

[0128] Specifically, the first target matrix can be expressed as:

[0129]

[0130] Among them, H BI represents the first channel matrix between the first base station and the RIS, H IUrepresents the second channel matrix between RIS and the terminal, H BU represents the third channel matrix between the first base station and the terminal; Φ represents the weight matrix of RIS, P B represents the precoding matrix of the first base station. BI For example, since the positions of the first base station (donor base station) and the RIS will not change after deployment, their channels have relatively obvious quasi-stationary characteristics. Therefore, after the RIS is deployed, the H can be obtained through the pilot measurement between the communication module on the RIS and the donor base station. BI , since the channel matrix has a slow-varying characteristic, H BI Once obtained, there is no need to measure again for a long time, thereby saving pilot overhead. See the following embodiment for details.

[0131] For H IU For example, since the position of the terminal equipment (low-altitude terminal) will keep changing, it is impossible to use the above method to obtain H BI However, since the channel from RIS to the terminal has obvious low-rank characteristics (the low-altitude scattering environment is simple), H IU It is approximated as a single-path channel, thereby greatly simplifying the process and overhead of channel estimation. For detailed implementation, please refer to the following embodiment section.

[0132] in, Used to reflect the phase information of the RIS.

[0133] Step 1022: Based on the first target matrix, alternately adjust the weight matrix of the RIS and the precoding matrix of the first base station to obtain a first weight matrix and a first precoding matrix corresponding to when the first target matrix takes a maximum value, wherein the first weight matrix serves as the first phase information and the first precoding matrix serves as the second phase information.

[0134] That is, to obtain That is, the first weight matrix and the first precoding matrix corresponding to the maximum value of the first target matrix.

[0135] It should be noted that due to optimization issues is non-convex and difficult to solve, so the joint optimization problem is transformed into an alternating optimization problem, that is, first fix Φ and optimize P B , and then fix P B , optimize Φ, and optimize the two steps alternately to obtain the final solution. B For the problem, since Φ is fixed (H BI ΦH IU +H BU ) can be regarded as a traditional channel, so P BClassic algorithms such as matched filter precoding can be directly used for design. B , to optimize Φ, we can search for the phase of Φ so that H BI ΦH IU P B and H BU P B Realize in-phase superposition to obtain the optimal solution.

[0136] Step 103: Send first indication information to the RIS, where the first indication information is used to instruct the RIS to forward a signal according to the first phase information;

[0137] Step 104: Send a first communication signal and a second communication signal to the terminal based on the second phase information; wherein the phase of the first communication signal after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after reaching the terminal after being forwarded by the RIS.

[0138] It should be noted that the first communication signal and the second communication signal are corresponding communication signals generated by the first base station after being radiated in different directions by the antenna.

[0139] Here, the phase of the first communication signal after reaching the terminal without being forwarded by the RIS is partially or completely superimposed (ie, in phase) with the phase of the second communication signal after reaching the terminal through the RIS.

[0140] Through the above processing and using the phase reconstruction of RIS, after the communication signal sent by the first base station as the donor base station reaches the low-altitude terminal, the low-altitude terminal obtains a phase-superimposed signal, and the corresponding communication signal quality is enhanced.

[0141] In an optional embodiment, in the above step 101, obtaining the second channel characteristic information between the RIS and the terminal may specifically include:

[0142] 1. Sending first codebook information to the RIS, where the first codebook information is the best codebook information among multiple codebook information configured by the first base station for the RIS;

[0143] It should be noted that the outgoing beam state of RIS is controlled by the base station. The base station sends beamforming codebook information to RIS according to the low-altitude coverage requirements of the terminal equipment (specifically low-altitude terminals, such as drones, etc.).

[0144] Prior to this, the method of the present invention may further include:

[0145] (1) configuring multiple codebook information for the RIS;

[0146] (2) For each of the plurality of codebook information, the following processing is performed to obtain a plurality of second measurement results:

[0147] (2-1) sending the codebook information to the RIS;

[0148] It should be noted that the RIS has a built-in module for communicating with the base station. The module can be implemented using a field programmable gate array (FPGA) or an integrated chip. The function of the module is to achieve time slot synchronization between the base station and the RIS and to receive beam indication information sent by the base station to control which codebook the RIS uses.

[0149] (2-2) sending a reference signal to the terminal by forwarding the RIS, wherein an outgoing beam used by the RIS when forwarding the reference signal is generated based on the codebook information;

[0150] (2-3) receiving a second measurement result fed back by the terminal after performing beam measurement based on the reference signal;

[0151] It should be noted that the above steps 2-1 to 2-3 are performed for each codebook information, so that multiple codebook information can obtain multiple second measurement results.

[0152] (2-4) Determine codebook information corresponding to a target measurement result as the first codebook information, wherein the target measurement result is the second measurement result having the strongest signal quality among the plurality of second measurement results.

[0153] 2. Sending a first pilot signal to the terminal through forwarding by the RIS, wherein a first outgoing beam used by the RIS when forwarding the first pilot signal is generated based on the first codebook information;

[0154] 3. Receive a first measurement result fed back by the terminal after performing channel measurement based on the first pilot signal;

[0155] 4. Based on the first measurement result, obtain a second channel matrix between the RIS and the terminal.

[0156] In an optional embodiment, in the above step 101, obtaining first channel characteristic information between the first base station and the intelligent supersurface RIS includes:

[0157] A1, sending a second pilot signal to the RIS;

[0158] A2, receiving a third measurement result fed back by the RIS after performing channel measurement based on the second pilot signal;

[0159] A3. Obtain a first channel matrix between the first base station and the RIS based on the third measurement result.

[0160] In an optional embodiment, in the above step 101, obtaining third channel characteristic information between the first base station and the terminal includes:

[0161] B1, sending a third pilot signal to the terminal;

[0162] B2, receiving a fourth measurement result fed back by the terminal after performing channel measurement based on the third pilot signal;

[0163] B3. Based on the fourth measurement result, obtain a third channel matrix between the first base station and the terminal.

[0164] The signal transmission method of the embodiment of the present invention obtains first channel characteristic information between the first base station and the intelligent super surface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal; according to the first channel characteristic information, the second channel characteristic information and the third channel characteristic information, the RIS and the first base station are phase adjusted to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station; first indication information is sent to the RIS, and the first indication information is used to instruct the RIS to forward the signal according to the first phase information; based on the second phase information, a first communication signal and a second communication signal are sent to the terminal; wherein the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS. Through the above processing, the phase reconstruction of the RIS is used to enhance the quality of the corresponding communication signal after the communication signal sent by the first base station as the donor base station arrives at the low-altitude terminal.

[0165] like Figure 3 As shown, the present invention also provides a signal transmission method, which is applied to a second base station, wherein the second base station is an interference base station, that is, another base station located next to the donor base station. Specifically, the method may include:

[0166] Step 301, obtaining second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal;

[0167] Optionally, the second channel characteristic information is a second channel matrix between the RIS and the terminal; the fourth channel characteristic information is a fourth channel matrix between the second base station and the RIS; and the fifth channel characteristic information is a fifth channel matrix between the second base station and the terminal.

[0168] Step 302, receiving first phase information sent by the RIS;

[0169] Optionally, the first phase information is a weight matrix of the RIS. Figure 1 As shown, on the first base station (donor base station) side, the RIS has acquired the first phase information about itself.

[0170] Step 303: Perform phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station;

[0171] In an optional embodiment, step 303 may specifically include:

[0172] Step 3031: Obtain a second target matrix according to the second channel matrix, the fourth channel matrix, the fifth channel matrix, the weight matrix of the RIS, and the precoding matrix of the second base station, wherein the weight matrix reflects the phase information of the RIS, and the precoding matrix of the second base station reflects the phase information of the second base station;

[0173] Specifically, the second target matrix can be expressed as:

[0174]

[0175] Among them, H B′I represents the fourth channel matrix between the second base station and the RIS, H IU represents the second channel matrix between RIS and the terminal, H B′U represents the fifth channel matrix between the second base station and the terminal; Φ represents the weight matrix of RIS, that is, Figure 1 The first weight matrix P calculated by the first base station (donor base station) side is shown as B′ represents the precoding matrix of the second base station.

[0176] Step 3032: Based on the second target matrix, adjust the precoding matrix of the second base station to obtain a second precoding matrix corresponding to when the second target matrix takes the minimum value, wherein the second precoding matrix serves as the third phase information.

[0177] That is, to obtain That is, the second precoding matrix corresponding to the minimum value of the second target matrix.

[0178] It should be noted that for optimizing the interference base station P B′ For example, since Φ has been determined, the optimization problem is By changing PB′ Projected onto the equivalent interference channel H B′I ΦH IU +H B′U The solution is found in the null space of .

[0179] Step 304: Send a third communication signal and a fourth communication signal to the terminal based on the third phase information; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal through the RIS at least partially.

[0180] It should be noted that the third communication signal and the fourth communication signal are corresponding communication signals generated by the second base station after being radiated in different directions by the antenna.

[0181] Here, the phase of the third communication signal after reaching the terminal without being forwarded by the RIS partially offsets or completely offsets (ie, is inversely phased) the phase of the fourth communication signal after reaching the terminal through the RIS.

[0182] Through the above processing and using the phase reconstruction of RIS, when the communication signal sent by the second base station, which is an interfering base station, reaches the low-altitude terminal, the low-altitude terminal will obtain a phase-canceling signal, that is, the communication signal sent by the second base station is reduced, even to the minimum, to achieve interference cancellation.

[0183] It should be noted that the specific implementation method of the second base station obtaining the second channel characteristic information between the RIS and the terminal is the same as that of the first base station side. The communication module on the RIS is alternately connected to the donor base station and the interference base station. When the interference base station is optimized, the RIS is controlled by the interference base station. When the donor base station is optimized, the RIS is controlled by the donor base station. The so-called donor base station and interference base station are for the terminal. The one with a good signal is the donor base station, and the one with a poor signal is the interference.

[0184] In an optional embodiment, the above step 301, obtaining the fourth channel characteristic information between the second base station and the RIS, may specifically include:

[0185] C1, sending a fourth pilot signal to the RIS;

[0186] C2, receiving a fifth measurement result fed back by the RIS after performing channel measurement based on the fourth pilot signal;

[0187] C3. Obtain a fourth channel matrix between the second base station and the RIS based on the fifth measurement result.

[0188] In an optional embodiment, the step 301 of acquiring fifth channel characteristic information between the second base station and the terminal includes:

[0189] D1, sending a fifth pilot signal to the terminal;

[0190] D2, receiving a sixth measurement result fed back by the terminal after performing channel measurement based on the fifth pilot signal;

[0191] D3. Based on the sixth measurement result, obtain a fifth channel matrix between the second base station and the terminal.

[0192] The signal transmission method of the embodiment of the present invention obtains the second channel characteristic information between the intelligent supersurface RIS and the terminal, the fourth channel characteristic information between the second base station and the RIS, and the fifth channel characteristic information between the second base station and the terminal; receives the first phase information sent by the RIS; according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information, the phase of the second base station is adjusted to obtain the third phase information corresponding to the second base station; based on the third phase information, a third communication signal and a fourth communication signal are sent to the terminal; wherein the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS is at least partially offset by the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS. Through the above processing, the phase reconstruction of the RIS is used to make it possible for the communication signal sent by the second base station as an interfering base station to reach the low-altitude terminal. After the corresponding communication signal quality is reduced, the interference cancellation is achieved.

[0193] like Figure 4 As shown, the present invention also provides a signal transmission method, which is applied to the intelligent super surface RIS, wherein the method may specifically include:

[0194] Step 401, receiving first indication information sent by a first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to first phase information;

[0195] Step 402: Send the first phase information to a second base station;

[0196] Step 403: forwarding a second communication signal sent by the first base station based on the first phase information; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after reaching the terminal through the RIS;

[0197] Step 404: forward the fourth communication signal sent by the second base station based on the first phase information; wherein the phase of the third communication signal sent by the second base station after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS at least partially.

[0198] It should be noted that RIS has a built-in module for communicating with the base station, which can be implemented using FPGA or integrated chip. RIS has transmission and reflection modes. When low-altitude communication is not performed, the first base station notifies RIS to switch to transmission mode to avoid the influence of RIS on the base station signal.

[0199] Here, by introducing RIS and utilizing the phase reconstruction of RIS, the quality of the corresponding communication signal emitted by the first base station as the donor base station can be enhanced after it reaches the low-altitude terminal; the quality of the corresponding communication signal emitted by the second base station as the interference base station can be reduced after it reaches the low-altitude terminal, thereby achieving interference cancellation.

[0200] The following embodiments are RIS corresponding to the above Figure 1 , Figure 3 The described embodiment involves an interaction process between the first base station, the second base station and the terminal.

[0201] In an optional embodiment, the method of the present invention may further include:

[0202] receiving first codebook information sent by the first base station, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS;

[0203] The first pilot signal from the first base station is forwarded to the terminal by using a first outgoing beam generated based on the first codebook information.

[0204] In an optional embodiment, the method of the present invention may further include:

[0205] Receiving any one of the codebook information among the multiple codebook information sent by the first base station;

[0206] The reference signal from the first base station is forwarded to the terminal by using an outgoing beam generated based on the codebook information.

[0207] In an optional embodiment, the method of the present invention may further include:

[0208] receiving a second pilot signal sent by the first base station;

[0209] Perform channel measurement based on the second pilot signal to obtain a third measurement result;

[0210] The third measurement result is fed back to the first base station.

[0211] In an optional embodiment, the method of the present invention may further include:

[0212] receiving a fourth pilot signal sent by the second base station;

[0213] Perform channel measurement based on the fourth pilot signal to obtain a fifth measurement result;

[0214] The fifth measurement result is fed back to the second base station.

[0215] The signal transmission method of the embodiment of the present invention receives first indication information sent by a first base station, wherein the first indication information is used to instruct the intelligent metasurface RIS to forward a signal according to first phase information; sends the first phase information to a second base station; based on the first phase information, forwards a second communication signal sent by the first base station; wherein the phase of the first communication signal sent by the first base station after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; based on the first phase information, forwards a fourth communication signal sent by the second base station; wherein the phase of the third communication signal sent by the second base station after arriving at the terminal without being forwarded by the RIS is at least partially offset with the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS. In this way, by using the phase reconstruction of the RIS, the quality of the corresponding communication signal sent by the first base station as a donor base station can be enhanced after the communication signal arrives at the low-altitude terminal; and the quality of the corresponding communication signal sent by the second base station as an interfering base station can be reduced after the communication signal arrives at the low-altitude terminal, thereby achieving interference cancellation.

[0216] like Figure 5 As shown, the present invention also provides a signal transmission method, which is applied to a terminal. The method may specifically include:

[0217] Step 501, receiving a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and the smart metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS;

[0218] Step 502: Receive a third communication signal and a fourth communication signal sent by the second base station through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal, respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and a phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets a phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0219] The steps performed by the terminal in the embodiment of the present invention are the same as those described above. Figure 1 , Figure 3 and Figure 4 The embodiment, i.e., the interaction process between the first base station, the second base station, the RIS and the terminal, realizes the phase reconstruction of the RIS by coordinating with the first base station, the second base station and the RIS side to meet the coverage requirements of the low-altitude communication of the terminal device.

[0220] The following embodiments are terminals corresponding to the above Figure 1 , Figure 3 and Figure 4 The embodiment described involves an interaction process between the first base station, the second base station, the RIS and the terminal.

[0221] In an optional embodiment, the method of the present invention may further include:

[0222] receiving, through forwarding by the RIS, a first pilot signal from the first base station;

[0223] Perform channel measurement based on the first pilot signal to obtain a first measurement result;

[0224] The first measurement result is fed back to the first base station.

[0225] In an optional embodiment, the method of the present invention may further include:

[0226] receiving a reference signal from the first base station through forwarding by the RIS;

[0227] Perform beam measurement based on the reference signal to obtain a second measurement result;

[0228] The second measurement result is fed back to the first base station.

[0229] In an optional embodiment, the method of the present invention may further include:

[0230] receiving a third pilot signal sent by the first base station;

[0231] Perform channel measurement based on the third pilot signal to obtain a fourth measurement result;

[0232] The fourth measurement result is fed back to the first base station.

[0233] In an optional embodiment, the method of the present invention may further include:

[0234] receiving a fifth pilot signal sent by the second base station;

[0235] Perform channel measurement based on the fifth pilot signal to obtain a sixth measurement result;

[0236] Feedback the sixth measurement result to the second base station.

[0237] The signal transmission method of the embodiment of the present invention receives a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and the intelligent super surface RIS and a channel between the RIS and the terminal, and the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; and receives a third communication signal and a fourth communication signal sent by the second base station through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal, respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS is at least partially offset with the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS, and phase reconstruction of the RIS is achieved by coordinating with the first base station, the second base station and the RIS side to meet the coverage requirements of low-altitude communication of terminal equipment.

[0238] The codebook of RIS is controlled by the base station. The base station controls the codebook of RIS to eliminate interference according to the current signal quality of low-altitude users. Figure 6 In actual low-altitude communication, a terminal (low-altitude terminal, such as a drone) can simultaneously receive signals from the donor base station (first base station) and the interfering base station (second base station). Since the interfering base station to the terminal is usually line-of-sight communication, it will cause great interference to the low-altitude communication. The method of the embodiment of the present invention is used to eliminate the signal of the interfering base station using RIS, thereby alleviating the problem of excessive interference in low-altitude communication. The specific process is as follows:

[0239] S1, deploy RIS at a location where it can receive signals from multiple base stations, and the RSRP of signals received from multiple base stations is higher than XdBm.

[0240] S2, RIS is controlled by the first base station, receives a downlink synchronization signal from the first base station, and sends an uplink synchronization signal to the first base station to complete uplink and downlink time synchronization.

[0241] S3, when the first base station performs low-altitude communication, its precoding matrix should be jointly optimized with the RIS weights, and the optimized RIS weights should be notified to the RIS.

[0242] Assume that the channel matrix between the first base station and RIS is H BI , the channel matrix between RIS and low-altitude terminal is H IU , the channel from the donor base station to the low-altitude terminal is H BU , the RIS weight matrix is The precoding matrix P of the first base station B , then the goal of joint optimization is to maximize the value of the following matrix.

[0243]

[0244] S4, when the first base station is communicating at low altitude, the precoding matrix of the second base station (interference base station) should also be jointly optimized with the RIS weights. Assume that the channel matrix between the interference base station and the RIS is H B'I , the channel matrix between RIS and low-altitude terminal is H IU , the channel matrix between the interfering base station and the low-altitude terminal is H B'U , the precoding matrix P of the second base station B' , the RIS weights have been obtained in S3, so the goal of joint optimization is to minimize the value of the following matrix.

[0245]

[0246] S5, RIS has transmission and reflection modes. When low-altitude communication is not performed, the donor base station notifies RIS to switch to transmission mode to avoid the influence of RIS on the base station signal.

[0247] S6, when the first base station (donor base station) of the low-altitude terminal changes, the donor base station of the RIS also changes accordingly, and then S1 to S5 are repeated.

[0248] like Figure 7 As shown, the present invention provides a signal transmission device, which is applied to a first base station, wherein the device may specifically include:

[0249] A first acquisition module 701 is used to acquire first channel characteristic information between a first base station and an intelligent supersurface RIS, second channel characteristic information between the RIS and a terminal, and third channel characteristic information between the first base station and the terminal;

[0250] A first processing module 702 is configured to perform phase adjustment on the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station;

[0251] A first sending module 703 is used to send first indication information to the RIS, where the first indication information is used to instruct the RIS to forward a signal according to the first phase information;

[0252] The second sending module 704 is used to send a first communication signal and a second communication signal to the terminal based on the second phase information; wherein the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS.

[0253] Optionally, the first channel characteristic information is a first channel matrix between the first base station and the RIS; the second channel characteristic information is a second channel matrix between the RIS and the terminal; and the third channel characteristic information is a third channel matrix between the first base station and the terminal.

[0254] Optionally, the first processing module 702 may include:

[0255] A first processing unit, configured to obtain a first target matrix according to the first channel matrix, the second channel matrix, the third channel matrix, a weight matrix of the RIS, and a precoding matrix of the first base station, wherein the weight matrix reflects phase information of the RIS, and the precoding matrix of the first base station reflects phase information of the first base station;

[0256] The second processing unit is used to alternately adjust the weight matrix of the RIS and the precoding matrix of the first base station based on the first target matrix to obtain a first weight matrix and a first precoding matrix corresponding to when the first target matrix takes a maximum value, wherein the first weight matrix is ​​used as the first phase information, and the first precoding matrix is ​​used as the second phase information.

[0257] Optionally, the first acquisition module 701 may include:

[0258] A first sending unit is configured to send first codebook information to the RIS, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS;

[0259] A second sending unit is configured to send a first pilot signal to the terminal through forwarding by the RIS, wherein a first outgoing beam used by the RIS when forwarding the first pilot signal is generated based on the first codebook information;

[0260] A first receiving unit, configured to receive a first measurement result fed back by the terminal after performing channel measurement based on the first pilot signal;

[0261] The first acquisition unit is configured to obtain a second channel matrix between the RIS and the terminal based on the first measurement result.

[0262] Optionally, the device in the embodiment of the present invention further includes:

[0263] A configuration module, configured to configure multiple codebook information for the RIS,

[0264] The third processing module is configured to perform the following processing on each of the plurality of codebook information to obtain a plurality of second measurement results:

[0265] Sending the codebook information to the RIS;

[0266] Sending a reference signal to the terminal through forwarding by the RIS, wherein an outgoing beam used by the RIS when forwarding the reference signal is generated based on the codebook information;

[0267] receiving a second measurement result fed back by the terminal after performing beam measurement based on the reference signal;

[0268] The codebook information corresponding to the target measurement result is determined as the first codebook information, wherein the target measurement result is the second measurement result corresponding to the strongest signal quality among the plurality of second measurement results.

[0269] Optionally, the RIS is located at a position corresponding to a maximum synchronization signal block SSB scanning angle of the first base station.

[0270] The signal transmission device of the embodiment of the present invention obtains first channel characteristic information between the first base station and the intelligent super surface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal; performs phase adjustment on the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station; sends first indication information to the RIS, and the first indication information is used to instruct the RIS to forward the signal according to the first phase information; based on the second phase information, sends a first communication signal and a second communication signal to the terminal; wherein the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS. Through the above processing, the phase reconstruction of the RIS is used to enhance the quality of the corresponding communication signal after the communication signal sent by the first base station as the donor base station arrives at the low-altitude terminal.

[0271] In order to better achieve the above goals, Figure 8 As shown, an embodiment of the present invention further provides a base station, which is a first base station, including a processor 800 and a transceiver 810, and the processor 800 is used to perform the following process:

[0272] Acquire first channel characteristic information between the first base station and the intelligent supersurface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal;

[0273] According to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information, phase adjustment is performed on the RIS and the first base station to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station;

[0274] Sending first indication information to the RIS, where the first indication information is used to instruct the RIS to forward a signal according to the first phase information;

[0275] Based on the second phase information, a first communication signal and a second communication signal are sent to the terminal; wherein the phase of the first communication signal after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after reaching the terminal after being forwarded by the RIS.

[0276] Optionally, the first channel characteristic information is a first channel matrix between the first base station and the RIS; the second channel characteristic information is a second channel matrix between the RIS and the terminal; and the third channel characteristic information is a third channel matrix between the first base station and the terminal.

[0277] Optionally, the processor 800 is further configured to:

[0278] Obtaining a first target matrix according to the first channel matrix, the second channel matrix, the third channel matrix, a weight matrix of the RIS, and a precoding matrix of the first base station, wherein the weight matrix reflects phase information of the RIS, and the precoding matrix of the first base station reflects phase information of the first base station;

[0279] Based on the first target matrix, the weight matrix of the RIS and the precoding matrix of the first base station are alternately adjusted to obtain a first weight matrix and a first precoding matrix corresponding to when the first target matrix takes a maximum value, wherein the first weight matrix serves as the first phase information and the first precoding matrix serves as the second phase information.

[0280] Optionally, the transceiver 810 is further configured to:

[0281] Sending first codebook information to the RIS, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS;

[0282] Sending a first pilot signal to the terminal through forwarding by the RIS, wherein a first outgoing beam used by the RIS when forwarding the first pilot signal is generated based on the first codebook information;

[0283] receiving a first measurement result fed back by the terminal after performing channel measurement based on the first pilot signal;

[0284] A second channel matrix between the RIS and the terminal is obtained based on the first measurement result.

[0285] Optionally, the processor 800 is further configured to:

[0286] Configure multiple codebook information for the RIS, and perform the following processing for each of the multiple codebook information to obtain multiple second measurement results:

[0287] Sending the codebook information to the RIS;

[0288] Sending a reference signal to the terminal through forwarding by the RIS, wherein an outgoing beam used by the RIS when forwarding the reference signal is generated based on the codebook information;

[0289] receiving a second measurement result fed back by the terminal after performing beam measurement based on the reference signal;

[0290] The codebook information corresponding to the target measurement result is determined as the first codebook information, wherein the target measurement result is the second measurement result corresponding to the strongest signal quality among the plurality of second measurement results.

[0291] Optionally, the RIS is located at a position corresponding to a maximum synchronization signal block SSB scanning angle of the first base station.

[0292] The base station of the embodiment of the present invention obtains first channel characteristic information between the first base station and the intelligent super surface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal; performs phase adjustment on the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station; sends first indication information to the RIS, where the first indication information is used to instruct the RIS to forward the signal according to the first phase information; based on the second phase information, sends a first communication signal and a second communication signal to the terminal; wherein the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS. Through the above processing, the phase reconstruction of the RIS is used to enhance the quality of the corresponding communication signal after the communication signal sent by the first base station as the donor base station arrives at the low-altitude terminal.

[0293] An embodiment of the present invention also provides a base station, which is a first base station, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the various processes in the signal transmission method embodiment as described above are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0294] like Fig. 9 As shown, the present invention provides a signal transmission device, which is applied to a second base station, wherein the device may specifically include:

[0295] The second acquisition module 901 is used to acquire the second channel characteristic information between the smart supersurface RIS and the terminal, the fourth channel characteristic information between the second base station and the RIS, and the fifth channel characteristic information between the second base station and the terminal;

[0296] A first receiving module 902, configured to receive first phase information sent by the RIS;

[0297] A second processing module 903 is used to perform phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station;

[0298] The third sending module 904 is used to send a third communication signal and a fourth communication signal to the terminal based on the third phase information; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS at least partially offsets.

[0299] Optionally, the second channel characteristic information is the second channel matrix between the RIS and the terminal; the fourth channel characteristic information is the fourth channel matrix between the second base station and the RIS; the fifth channel characteristic information is the fifth channel matrix between the second base station and the terminal; and the first phase information is the weight matrix of the RIS.

[0300] Optionally, the second processing module 903 may include:

[0301] a third processing unit, configured to obtain a second target matrix according to the second channel matrix, the fourth channel matrix, the fifth channel matrix, a weight matrix of the RIS, and a precoding matrix of the second base station, wherein the weight matrix reflects the phase information of the RIS, and the precoding matrix of the second base station reflects the phase information of the second base station;

[0302] The fourth processing unit is used to adjust the precoding matrix of the second base station based on the second target matrix to obtain a second precoding matrix corresponding to when the value of the second target matrix is ​​minimized, wherein the second precoding matrix is ​​used as the third phase information.

[0303] The signal transmission device of the embodiment of the present invention obtains the second channel characteristic information between the intelligent metasurface RIS and the terminal, the fourth channel characteristic information between the second base station and the RIS, and the fifth channel characteristic information between the second base station and the terminal; receives the first phase information sent by the RIS; performs phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain the third phase information corresponding to the second base station; based on the third phase information, sends a third communication signal and a fourth communication signal to the terminal; wherein the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS is at least partially offset by the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS. Through the above processing, using the phase reconstruction of the RIS, the communication signal sent by the second base station as an interfering base station can reduce the quality of the corresponding communication signal after arriving at the low-altitude terminal, thereby achieving interference cancellation.

[0304] like Fig.10As shown, an embodiment of the present invention further provides a base station, which is a second base station, including a processor 1000 and a transceiver 1010, and the processor 1000 is used to perform the following process:

[0305] Acquire second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal;

[0306] Receiving first phase information sent by the RIS;

[0307] Performing phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station;

[0308] Based on the third phase information, a third communication signal and a fourth communication signal are sent to the terminal; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal through the RIS at least partially.

[0309] Optionally, the second channel characteristic information is the second channel matrix between the RIS and the terminal; the fourth channel characteristic information is the fourth channel matrix between the second base station and the RIS; the fifth channel characteristic information is the fifth channel matrix between the second base station and the terminal; and the first phase information is the weight matrix of the RIS.

[0310] Optionally, the processor 1000 is further configured to:

[0311] Obtaining a second target matrix according to the second channel matrix, the fourth channel matrix, the fifth channel matrix, the weight matrix of the RIS, and the precoding matrix of the second base station, wherein the weight matrix reflects the phase information of the RIS, and the precoding matrix of the second base station reflects the phase information of the second base station;

[0312] Based on the second target matrix, the precoding matrix of the second base station is adjusted to obtain a second precoding matrix corresponding to a value that minimizes the second target matrix, wherein the second precoding matrix serves as the third phase information.

[0313] The base station of the embodiment of the present invention obtains the second channel characteristic information between the intelligent supersurface RIS and the terminal, the fourth channel characteristic information between the second base station and the RIS, and the fifth channel characteristic information between the second base station and the terminal; receives the first phase information sent by the RIS; performs phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain the third phase information corresponding to the second base station; based on the third phase information, sends a third communication signal and a fourth communication signal to the terminal; wherein the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS is at least partially offset by the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS. Through the above processing, using the phase reconstruction of the RIS, the communication signal sent by the second base station as an interfering base station can reduce the quality of the corresponding communication signal after arriving at the low-altitude terminal, thereby achieving interference cancellation.

[0314] An embodiment of the present invention also provides a base station, which is a second base station, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the various processes in the signal transmission method embodiment as described above are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0315] like Fig.11 As shown, an embodiment of the present invention further provides a signal transmission device, which is applied to a smart metasurface, wherein the device specifically includes:

[0316] The second receiving module 1101 is used to receive first indication information sent by the first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information;

[0317] A fourth sending module 1102, configured to send the first phase information to a second base station;

[0318] A first forwarding module 1103 is configured to forward a second communication signal sent by the first base station based on the first phase information; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal;

[0319] The second forwarding module 1104 is used to forward the fourth communication signal sent by the second base station based on the first phase information; wherein the phase of the third communication signal sent by the second base station after arriving at the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0320] Optionally, the device in the embodiment of the present invention further includes:

[0321] a fifth receiving module, configured to receive first codebook information sent by the first base station, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS;

[0322] The third forwarding module is configured to forward the first pilot signal from the first base station to the terminal by using the first outgoing beam generated based on the first codebook information.

[0323] Optionally, the device in the embodiment of the present invention further includes:

[0324] A sixth receiving module, configured to receive any one of the codebook information among the multiple codebook information sent by the first base station;

[0325] A fourth forwarding module is used to forward the reference signal from the first base station to the terminal by using an outgoing beam generated based on the codebook information.

[0326] The signal transmission device of the embodiment of the present invention receives first indication information sent by a first base station, wherein the first indication information is used to instruct the intelligent metasurface RIS to forward a signal according to the first phase information; sends the first phase information to a second base station; based on the first phase information, forwards a second communication signal sent by the first base station; wherein the phase of the first communication signal sent by the first base station after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; based on the first phase information, forwards a fourth communication signal sent by the second base station; wherein the phase of the third communication signal sent by the second base station after arriving at the terminal without being forwarded by the RIS is at least partially offset with the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS. In this way, by using the phase reconstruction of the RIS, the quality of the corresponding communication signal sent by the first base station as a donor base station can be enhanced after the communication signal arrives at the low-altitude terminal; and the quality of the corresponding communication signal sent by the second base station as an interfering base station can be reduced after the communication signal arrives at the low-altitude terminal, thereby achieving interference cancellation.

[0327] like Fig.12 As shown, an embodiment of the present invention further provides a smart metasurface, including a processor 1200 and a transceiver 1210, wherein the transceiver 1210 receives and sends data under the control of the processor 1200, and the processor 1200 is used to perform the following operations:

[0328] Receiving first indication information sent by a first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information;

[0329] Sending the first phase information to a second base station;

[0330] Based on the first phase information, forwarding the second communication signal sent by the first base station; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal;

[0331] Based on the first phase information, the fourth communication signal sent by the second base station is forwarded; wherein the phase of the third communication signal sent by the second base station after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS.

[0332] Optionally, the transceiver 1210 is further configured to:

[0333] receiving first codebook information sent by the first base station, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS;

[0334] The first pilot signal from the first base station is forwarded to the terminal by using a first outgoing beam generated based on the first codebook information.

[0335] Optionally, the transceiver 1210 is further configured to:

[0336] Receiving any one of the codebook information among the multiple codebook information sent by the first base station;

[0337] The reference signal from the first base station is forwarded to the terminal by using an outgoing beam generated based on the codebook information.

[0338] The smart metasurface of the embodiment of the present invention receives first indication information sent by a first base station, wherein the first indication information is used to instruct the smart metasurface RIS to forward a signal according to first phase information; sends the first phase information to a second base station; forwards a second communication signal sent by the first base station based on the first phase information; wherein the phase of the first communication signal sent by the first base station after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; forwards a fourth communication signal sent by the second base station based on the first phase information; wherein the phase of the third communication signal sent by the second base station after arriving at the terminal without being forwarded by the RIS is at least partially offset with the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS. In this way, by using the phase reconstruction of the RIS, the quality of the corresponding communication signal sent by the first base station as a donor base station can be enhanced after the communication signal arrives at the low-altitude terminal; and the quality of the corresponding communication signal sent by the second base station as an interfering base station can be reduced after the communication signal arrives at the low-altitude terminal, thereby achieving interference cancellation.

[0339] An embodiment of the present invention further provides an intelligent metasurface, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, each process in the signal transmission method embodiment described above is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0340] like Fig.13 As shown, the present invention also provides a signal transmission device, which is applied to a terminal, wherein the device may specifically include:

[0341] The third receiving module 1301 is used to receive a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and the smart metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS;

[0342] The fourth receiving module 1302 is used to receive the third communication signal and the fourth communication signal sent by the second base station through the second direct communication channel between the second base station and the terminal and the second forwarding channel between the second base station and the terminal, respectively, wherein the second forwarding channel includes the channel between the second base station and the RIS and the channel between the RIS and the terminal, and the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0343] Optionally, the device of the embodiment of the present invention may further include:

[0344] a seventh receiving module, configured to receive a first pilot signal from the first base station through forwarding by the RIS;

[0345] A third acquisition module, configured to perform channel measurement based on the first pilot signal to obtain a first measurement result;

[0346] The first feedback module is configured to feed back the first measurement result to the first base station.

[0347] Optionally, the device of the embodiment of the present invention may further include:

[0348] an eighth receiving module, configured to receive a reference signal from the first base station through forwarding by the RIS;

[0349] A fourth acquisition module, configured to perform beam measurement based on the reference signal to obtain a second measurement result;

[0350] The second feedback module is configured to feed back the second measurement result to the first base station.

[0351] The terminal of the embodiment of the present invention receives a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and an intelligent super surface RIS and a channel between the RIS and the terminal, and the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; and receives a third communication signal and a fourth communication signal sent by the second base station through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal, respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS is at least partially offset with the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS, and phase reconstruction of the RIS is achieved by coordinating with the first base station, the second base station and the RIS side to meet the coverage requirements of low-altitude communication of terminal equipment.

[0352] like Fig.14 As shown, an embodiment of the present invention further provides a terminal, including a processor 1400 and a transceiver 1410. The terminal also includes a user interface 1420. The processor 1400 is used to perform the following process:

[0353] Receiving a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and an intelligent metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS;

[0354] A third communication signal and a fourth communication signal sent by the second base station are received through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and a phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets a phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

[0355] Optionally, the processor 1400 is further configured to:

[0356] receiving, through forwarding by the RIS, a first pilot signal from the first base station;

[0357] Perform channel measurement based on the first pilot signal to obtain a first measurement result;

[0358] The first measurement result is fed back to the first base station.

[0359] Optionally, the processor 1400 is further configured to:

[0360] receiving a reference signal from the first base station through forwarding by the RIS;

[0361] Perform beam measurement based on the reference signal to obtain a second measurement result;

[0362] The second measurement result is fed back to the first base station.

[0363] The terminal of the embodiment of the present invention receives a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and an intelligent super surface RIS and a channel between the RIS and the terminal, and the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; and receives a third communication signal and a fourth communication signal sent by the second base station through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal, respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS is at least partially offset with the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS, and phase reconstruction of the RIS is achieved by coordinating with the first base station, the second base station and the RIS side to meet the coverage requirements of low-altitude communication of terminal equipment.

[0364] An embodiment of the present invention also provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the various processes in the signal transmission method embodiment described above are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0365] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, each process in the above-mentioned signal transmission method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0366] 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 combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0367] 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 program instructions. These computer program 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 device that specifies functions in one or more processes and / or one or more blocks.

[0368] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable storage medium produce a paper product 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.

[0369] These computer program instructions may also be loaded onto a computer or other programmable data processing device so that the computer or other programmable device executes a series of operating steps to produce a computer-implemented process, thereby providing instructions executed on the computer or other programmable device for implementing 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.

[0370] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A signal transmission method, applied to a first base station, characterized in that: include: Acquire first channel characteristic information between the first base station and the intelligent supersurface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal; According to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information, phase adjustment is performed on the RIS and the first base station to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station; Sending first indication information to the RIS, where the first indication information is used to instruct the RIS to forward a signal according to the first phase information; Based on the second phase information, a first communication signal and a second communication signal are sent to the terminal; wherein the phase of the first communication signal after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after reaching the terminal after being forwarded by the RIS.

2. The method according to claim 1, characterized in that The first channel characteristic information is a first channel matrix between the first base station and the RIS; the second channel characteristic information is a second channel matrix between the RIS and the terminal; and the third channel characteristic information is a third channel matrix between the first base station and the terminal.

3. The method according to claim 2, characterized in that The phase adjustment of the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station includes: Obtaining a first target matrix according to the first channel matrix, the second channel matrix, the third channel matrix, a weight matrix of the RIS, and a precoding matrix of the first base station, wherein the weight matrix reflects phase information of the RIS, and the precoding matrix of the first base station reflects phase information of the first base station; Based on the first target matrix, the weight matrix of the RIS and the precoding matrix of the first base station are alternately adjusted to obtain a first weight matrix and a first precoding matrix corresponding to when the first target matrix takes a maximum value, wherein the first weight matrix serves as the first phase information and the first precoding matrix serves as the second phase information.

4. The method according to claim 2, characterized in that: The obtaining of the second channel characteristic information between the RIS and the terminal includes: Sending first codebook information to the RIS, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS; Sending a first pilot signal to the terminal through forwarding by the RIS, wherein a first outgoing beam used by the RIS when forwarding the first pilot signal is generated based on the first codebook information; receiving a first measurement result fed back by the terminal after performing channel measurement based on the first pilot signal; A second channel matrix between the RIS and the terminal is obtained based on the first measurement result.

5. The method according to claim 4, characterized in that The method further comprises: Configure multiple codebook information for the RIS, and perform the following processing for each of the multiple codebook information to obtain multiple second measurement results: Sending the codebook information to the RIS; Sending a reference signal to the terminal through forwarding by the RIS, wherein an outgoing beam used by the RIS when forwarding the reference signal is generated based on the codebook information; receiving a second measurement result fed back by the terminal after performing beam measurement based on the reference signal; The codebook information corresponding to the target measurement result is determined as the first codebook information, wherein the target measurement result is the second measurement result corresponding to the strongest signal quality among the plurality of second measurement results.

6. The method according to claim 1, characterized in that The RIS is located at a position corresponding to the maximum synchronization signal block SSB scanning angle of the first base station.

7. A signal transmission method, applied to a second base station, characterized in that: include: Acquire second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal; Receiving first phase information sent by the RIS; Performing phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station; Based on the third phase information, a third communication signal and a fourth communication signal are sent to the terminal; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal through the RIS at least partially.

8. The method according to claim 7, characterized in that The second channel characteristic information is the second channel matrix between the RIS and the terminal; the fourth channel characteristic information is the fourth channel matrix between the second base station and the RIS; the fifth channel characteristic information is the fifth channel matrix between the second base station and the terminal; and the first phase information is the weight matrix of the RIS.

9. The method according to claim 8, characterized in that The performing phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station includes: Obtaining a second target matrix according to the second channel matrix, the fourth channel matrix, the fifth channel matrix, the weight matrix of the RIS, and the precoding matrix of the second base station, wherein the weight matrix reflects the phase information of the RIS, and the precoding matrix of the second base station reflects the phase information of the second base station; Based on the second target matrix, the precoding matrix of the second base station is adjusted to obtain a second precoding matrix corresponding to a value that minimizes the second target matrix, wherein the second precoding matrix serves as the third phase information.

10. A signal transmission method, applied to a smart metasurface, characterized in that: include: Receiving first indication information sent by a first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information; Sending the first phase information to a second base station; Based on the first phase information, forwarding the second communication signal sent by the first base station; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal; Based on the first phase information, the fourth communication signal sent by the second base station is forwarded; wherein the phase of the third communication signal sent by the second base station after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS.

11. The method according to claim 10, characterized in that The method further comprises: receiving first codebook information sent by the first base station, where the first codebook information is optimal codebook information among multiple codebook information configured by the first base station for the RIS; The first pilot signal from the first base station is forwarded to the terminal by using a first outgoing beam generated based on the first codebook information.

12. The method according to claim 11, characterized in that The method further comprises: Receiving any one of the codebook information among the multiple codebook information sent by the first base station; The reference signal from the first base station is forwarded to the terminal by using an outgoing beam generated based on the codebook information.

13. A signal transmission method, applied to a terminal, characterized in that: include: Receiving a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and an intelligent metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; A third communication signal and a fourth communication signal sent by the second base station are received through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and a phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets a phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

14. The method according to claim 13, characterized in that The method further comprises: receiving, through forwarding by the RIS, a first pilot signal from the first base station; Perform channel measurement based on the first pilot signal to obtain a first measurement result; The first measurement result is fed back to the first base station.

15. The method according to claim 13, characterized in that The method further comprises: receiving a reference signal from the first base station through forwarding by the RIS; Perform beam measurement based on the reference signal to obtain a second measurement result; The second measurement result is fed back to the first base station.

16. A signal transmission device, characterized in that: include: A first acquisition module is used to acquire first channel characteristic information between the first base station and the intelligent super surface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal; A first processing module, configured to perform phase adjustment on the RIS and the first base station according to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information, to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station; A first sending module, configured to send first indication information to the RIS, wherein the first indication information is used to instruct the RIS to forward a signal according to the first phase information; A second sending module is used to send a first communication signal and a second communication signal to the terminal based on the second phase information; wherein the phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after arriving at the terminal after being forwarded by the RIS.

17. A base station, the base station being a first base station, comprising a processor and a transceiver, wherein the transceiver receives and sends data under the control of the processor, characterized in that: The processor is configured to perform the following operations: Acquire first channel characteristic information between the first base station and the intelligent supersurface RIS, second channel characteristic information between the RIS and the terminal, and third channel characteristic information between the first base station and the terminal; According to the first channel characteristic information, the second channel characteristic information, and the third channel characteristic information, phase adjustment is performed on the RIS and the first base station to obtain first phase information corresponding to the RIS and second phase information corresponding to the first base station; Sending first indication information to the RIS, where the first indication information is used to instruct the RIS to forward a signal according to the first phase information; Based on the second phase information, a first communication signal and a second communication signal are sent to the terminal; wherein the phase of the first communication signal after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after reaching the terminal after being forwarded by the RIS.

18. A base station, the base station being a first base station, comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the signal transmission method according to any one of claims 1 to 6 is implemented.

19. A signal transmission device, characterized in that: include: A second acquisition module is used to acquire second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal; A first receiving module, used for receiving first phase information sent by the RIS; A second processing module, configured to perform phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information, to obtain third phase information corresponding to the second base station; A third sending module is used to send a third communication signal and a fourth communication signal to the terminal based on the third phase information; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS.

20. A base station, the base station being a second base station, comprising a processor and a transceiver, the transceiver receiving and sending data under the control of the processor, characterized in that: The processor is configured to perform the following operations: Acquire second channel characteristic information between the smart supersurface RIS and the terminal, fourth channel characteristic information between the second base station and the RIS, and fifth channel characteristic information between the second base station and the terminal; Receiving first phase information sent by the RIS; Performing phase adjustment on the second base station according to the second channel characteristic information, the fourth channel characteristic information, the fifth channel characteristic information and the first phase information to obtain third phase information corresponding to the second base station; Based on the third phase information, a third communication signal and a fourth communication signal are sent to the terminal; wherein the phase of the third communication signal after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal through the RIS at least partially.

21. A base station, the base station being a second base station, comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the signal transmission method according to any one of claims 7 to 9 is implemented.

22. A signal transmission device, characterized in that: include: A second receiving module is used to receive first indication information sent by the first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information; A fourth sending module, configured to send the first phase information to a second base station; A first forwarding module, configured to forward a second communication signal sent by the first base station based on the first phase information; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal; A second forwarding module is used to forward the fourth communication signal sent by the second base station based on the first phase information; wherein the phase of the third communication signal sent by the second base station after arriving at the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

23. A smart metasurface, comprising a processor and a transceiver, wherein the transceiver receives and sends data under the control of the processor, characterized in that: The processor is configured to perform the following operations: Receiving first indication information sent by a first base station, where the first indication information is used to instruct the smart metasurface RIS to forward a signal according to the first phase information; Sending the first phase information to a second base station; Based on the first phase information, forwarding the second communication signal sent by the first base station; wherein the phase of the first communication signal sent by the first base station after reaching the terminal without being forwarded by the RIS is at least partially superimposed with the phase of the second communication signal after being forwarded by the RIS and reaching the terminal; Based on the first phase information, the fourth communication signal sent by the second base station is forwarded; wherein the phase of the third communication signal sent by the second base station after reaching the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after reaching the terminal after being forwarded by the RIS.

24. A smart metasurface, comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the signal transmission method according to any one of claims 10 to 12 is implemented.

25. A signal transmission device, characterized in that: include: A third receiving module is used to receive a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and the smart metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; The fourth receiving module is used to receive the third communication signal and the fourth communication signal sent by the second base station through the second direct communication channel between the second base station and the terminal and the second forwarding channel between the second base station and the terminal, respectively, wherein the second forwarding channel includes the channel between the second base station and the RIS and the channel between the RIS and the terminal, and the phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets the phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

26. A terminal comprising a processor and a transceiver, characterized in that: The processor is used to execute the following process: Receiving a first communication signal and a second communication signal sent by the first base station through a first direct communication channel between the first base station and the terminal and a first forwarding channel between the first base station and the terminal, respectively, wherein the first forwarding channel includes a channel between the first base station and an intelligent metasurface RIS and a channel between the RIS and the terminal, and a phase of the first communication signal after arriving at the terminal without being forwarded by the RIS is at least partially superimposed with a phase of the second communication signal after arriving at the terminal after being forwarded by the RIS; A third communication signal and a fourth communication signal sent by the second base station are received through a second direct communication channel between the second base station and the terminal and a second forwarding channel between the second base station and the terminal respectively, wherein the second forwarding channel includes a channel between the second base station and the RIS and a channel between the RIS and the terminal, and a phase of the third communication signal after arriving at the terminal without being forwarded by the RIS at least partially offsets a phase of the fourth communication signal after arriving at the terminal after being forwarded by the RIS.

27. A terminal comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that: When the processor executes the program, the signal transmission method according to any one of claims 13 to 15 is implemented.

28. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, it implements the steps in the signal transmission method as described in any one of claims 1 to 6, or implements the steps in the signal transmission method as described in any one of claims 7 to 9, or implements the steps in the signal transmission method as described in any one of claims 10 to 12, or implements the steps in the signal transmission method as described in any one of claims 13 to 15.

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