Communication method and device

Abstract

Provided are a communication method and device, the method comprising: a first device receiving first information, the first information being used for indicating a correspondence between a first frequency band and a first transmission angle; and the first device transmits a first wave beam to the RIS at the first transmission angle, the first wave beam corresponds to the first frequency band, and the first wave beam is transmitted to a second device at a target reflection angle after being transmitted into the RIS. According to the scheme, the first device can transmit the wave beam of a certain frequency band at a certain transmitting angle according to the corresponding relation between the frequency band and the transmitting angle, so that the wave beam is transmitted to the second device at the target reflection angle after being transmitted into the RIS, namely, the wave beam reflected by the RIS can be aligned with the receiving end, and the receiving performance of the receiving end is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a communication method and device. Background Art

[0002] Reconfigurable intelligent surface (RIS) is considered to be a key technology to expand the coverage of wireless communication networks. By adjusting the physical properties of electromagnetic units (such as capacitance, resistance or inductance), the radiation characteristics of RIS can be changed, thereby realizing unconventional physical phenomena (such as non-specular reflection, negative refraction, wave absorption, focusing and polarization conversion, etc.), and then dynamically controlling electromagnetic waves (or beams). However, the beam reflected by RIS cannot be aligned with the receiving end, resulting in poor reception performance at the receiving end.

[0003] Therefore, how to improve the receiving performance of the receiving end is an urgent problem to be solved. Summary of the invention

[0004] The present application provides a communication method and device, which can improve the receiving performance of a receiving end.

[0005] In a first aspect, a communication method is provided, which can be performed by a first device, which can be a terminal device or a network device, or a component in the terminal device or the network device (e.g., a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the terminal device, or a logic module or software that can implement all or part of the functions of the network device. The method includes: the first device receives first information, wherein the first information is used to indicate the correspondence between a first frequency band and a first transmission angle; the first device transmits a first beam to a RIS at the first transmission angle, the first beam corresponds to the first frequency band, and the RIS is used to reflect the first beam.

[0006] Through the above embodiment, the first device can transmit a beam of a certain frequency band at a certain transmission angle according to the correspondence between the frequency band and the transmission angle. The above scheme can support the beam to be emitted to the target receiving end after entering the RIS, that is, the beam reflected by the RIS can be aligned with the receiving end, thereby improving the receiving performance of the receiving end.

[0007] In combination with the first aspect, in certain implementations of the first aspect, the first information is specifically used to indicate a correspondence between multiple frequency bands and multiple transmission angles, the first frequency band is one of the multiple frequency bands, and the first transmission angle is one of the multiple transmission angles.

[0008] Through the above embodiments, the first information can indicate the correspondence between multiple frequency bands and multiple transmission angles. On the one hand, the first information can indicate the correspondence between the first frequency band and the first transmission angle. On the other hand, the first information can also indicate the correspondence between other frequency bands and other transmission angles, so that the beams transmitted by the first device on more frequency bands can be aligned with the receiving end, thereby improving the receiving performance of the receiving end on multiple frequency bands.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the method also includes: the first device receives second information, the second information is used to indicate the correspondence between a reference frequency band and a reference transmission angle; and the first information is specifically used to indicate the correspondence between multiple frequency band offsets and multiple transmission angle offsets, there is a first frequency band offset between the first frequency band and the reference frequency band, the first frequency band offset corresponds to a first transmission angle offset, the first transmission angle is determined based on the reference transmission angle and the first transmission angle offset, the first frequency band offset is one of the multiple frequency band offsets, and the first transmission angle offset is one of the multiple transmission angle offsets.

[0010] Through the above embodiment, the first device can determine the correspondence between the reference frequency band and the reference transmission angle according to the second information, and determine the correspondence between multiple frequency band offsets and multiple transmission angle offsets according to the first information. Then, the first device can determine the transmission angle of the first frequency band according to the first information and the second information, and can determine the transmission angles of other frequency bands. In the above embodiment, the first device receives information indicating the reference amount and the offset, which reduces the communication overhead compared to the scheme indicating the transmission angle of each frequency band.

[0011] In combination with the first aspect, in some implementations of the first aspect, the first information includes a unit transmission angle offset, where the unit transmission angle offset is a transmission angle offset between adjacent frequency bands.

[0012] Through the above embodiment, the first information may include a unit transmission angle offset. In this way, the first device can determine the transmission angle of the first frequency band according to the first information and the second information, and can determine the transmission angles of other frequency bands. The above embodiment further reduces communication overhead.

[0013] In combination with the first aspect, in some implementations of the first aspect, the first information is information received by the first device from a device having control rights of the reflection weight of the RIS.

[0014] Through the above embodiment, the information indicating that the first frequency band corresponds to the first transmission angle can come from the device having the control right of the reflection weight of the RIS. The device having the control right of the reflection weight of the RIS can determine that the beam of the first frequency band transmitted to the RIS at the first transmission angle can be reflected to the second device at the target reflection angle, so that the beam of the first frequency band can improve the receiving effect of the receiving end.

[0015] In combination with the first aspect, in some implementations of the first aspect, the device having the control right of the reflection weight of the RIS is a target receiving end of the first beam or the RIS.

[0016] In combination with the first aspect, in some implementations of the first aspect, the method further includes: the first device receives third information, and the third information is used to determine the width of the first frequency band.

[0017] Through the above embodiment, the first device can determine the frequency width of the first frequency band according to the third information, so that the first device can transmit a beam within the frequency range of the first frequency band.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the multiple frequency bands are divided into at least two frequency band groups, wherein the method also includes: the first device receives third information, and the third information is used to indicate the frequency width of the frequency bands included in each of the at least two frequency band groups, wherein the at least two frequency band groups include a first frequency band group and a second frequency band group, the frequency width of the frequency bands included in the first frequency band group is different from the frequency width of the frequency bands included in the second frequency band group, and the first frequency band group includes the first frequency band.

[0019] Through the above embodiment, the third information can indicate the frequency width of the frequency bands included in each frequency band group, which enables the first device to determine the frequency width of each frequency band according to the third information, so that the first device can transmit a beam within the frequency range of the first frequency band.

[0020] In combination with the first aspect, in certain implementations of the first aspect, the third information includes a preset threshold, wherein the beam of the minimum frequency of the first frequency band enters the RIS at the first transmission angle and is emitted at a first reflection angle, and the beam of the maximum frequency of the first frequency band enters the RIS at the first transmission angle and is emitted at a second reflection angle, and the difference between the first reflection angle and the second reflection angle is less than or equal to the preset threshold.

[0021] Through the above embodiment, the first device can determine the frequency width of the first frequency band according to the preset threshold. Compared with the solution with fixed frequency width, the above embodiment makes the error of reflection angle within the preset threshold range after the beams with frequencies within a frequency band are transmitted to the RIS at the same transmission angle, thereby improving the precoding performance without significantly increasing the system complexity.

[0022] In a second aspect, a communication method is provided, which can be executed by a target device, or by a component in the target device (e.g., a processor, a chip, or a chip system, etc.), or by a logic module or software that can implement all or part of the functions of the target device. The method includes: the target device obtains first information, wherein the target device is a second device or a RIS, and the first information is used to indicate a correspondence between a first frequency band and a first emission angle, wherein a beam corresponding to the first frequency band emitted to the RIS at the first emission angle is emitted to the second device at a target reflection angle after entering the RIS; and the target device sends the first information to the first device.

[0023] Through the above embodiments, the first device can determine to transmit a beam of a certain frequency band at a certain transmission angle according to the correspondence between the frequency band and the transmission angle, so that the beam enters the RIS and then is emitted toward the second device at a target reflection angle, that is, the beam reflected by the RIS can be aligned with the receiving end, thereby improving the receiving performance of the receiving end.

[0024] In combination with the second aspect, in certain implementations of the second aspect, the first information is specifically used to indicate the correspondence between multiple frequency bands and multiple transmission angles, the first frequency band is one of the multiple frequency bands, and the first transmission angle is one of the multiple transmission angles.

[0025] Through the above embodiments, the first information can indicate the correspondence between multiple frequency bands and multiple transmission angles. On the one hand, the first information can indicate the correspondence between the first frequency band and the first transmission angle. On the other hand, the first information can also indicate the correspondence between other frequency bands and other transmission angles, so that the beams transmitted by the first device on more frequency bands can be aligned with the receiving end, thereby improving the receiving performance of the receiving end on multiple frequency bands.

[0026] In combination with the second aspect, in certain implementations of the second aspect, the method also includes: the target device sends second information to the first device, the second information is used to indicate the correspondence between a reference frequency band and a reference transmission angle; and the first information is specifically used to indicate the correspondence between multiple frequency band offsets and multiple transmission angle offsets, there is a first frequency band offset between the first frequency band and the reference frequency band, the first frequency band offset corresponds to a first transmission angle offset, the first transmission angle is determined based on the reference transmission angle and the first transmission angle offset, the first frequency band offset is one of the multiple frequency band offsets, and the first transmission angle offset is one of the multiple transmission angle offsets.

[0027] Through the above embodiment, the first device can determine the correspondence between the reference frequency band and the reference transmission angle according to the second information, and determine the correspondence between multiple frequency band offsets and multiple transmission angle offsets according to the first information. Then, the first device can determine the transmission angle of the first frequency band according to the first information and the second information, and can determine the transmission angles of other frequency bands. In the above embodiment, the first device receives information indicating the reference amount and the offset, which reduces the communication overhead compared to the scheme indicating the transmission angle of each frequency band.

[0028] In combination with the second aspect, in some implementations of the second aspect, the first information includes a unit transmission angle offset, where the unit transmission angle offset is a transmission angle offset between adjacent frequency bands.

[0029] Through the above embodiment, the first information may include a unit transmission angle offset. In this way, the first device can determine the transmission angle of the first frequency band according to the first information and the second information, and can determine the transmission angles of other frequency bands. The above embodiment further reduces communication overhead.

[0030] In combination with the second aspect, in some implementations of the second aspect, the target device is a device having control rights over the reflection weight of the RIS.

[0031] Through the above embodiment, the information indicating that the first frequency band corresponds to the first transmission angle can come from the device having the control right of the reflection weight of the RIS. The device having the control right of the reflection weight of the RIS can determine that the beam of the first frequency band transmitted to the RIS at the first transmission angle can be reflected to the second device at the target reflection angle, so that the beam of the first frequency band can improve the receiving effect of the receiving end.

[0032] In combination with the second aspect, in some implementations of the second aspect, the target device is the second device or the RIS.

[0033] In combination with the second aspect, in some implementations of the second aspect, the method further includes: the target device sends third information to the first device, and the third information is used to determine the frequency width of the first frequency band.

[0034] Through the above embodiment, the first device can determine the frequency width of the first frequency band according to the third information, so that the first device can transmit a beam within the frequency range of the first frequency band.

[0035] In combination with the second aspect, in certain implementations of the second aspect, the multiple frequency bands are divided into at least two frequency band groups, wherein the method also includes: the target device sends third information to the first device, and the third information is used to indicate the frequency width of the frequency band included in each of the at least two frequency band groups, wherein the at least two frequency band groups include a first frequency band group and a second frequency band group, the frequency width of the frequency band included in the first frequency band group is different from the frequency width of the frequency band included in the second frequency band group, and the first frequency band group includes the first frequency band.

[0036] Through the above embodiment, the third information can indicate the frequency width of the frequency bands included in each frequency band group, which enables the first device to determine the frequency width of each frequency band according to the third information, so that the first device can transmit a beam within the frequency range of the first frequency band.

[0037] In combination with the second aspect, in certain implementations of the second aspect, the third information of the method includes a preset threshold, and the target reflection angle includes a first reflection angle and a second reflection angle, wherein the beam of the minimum frequency of the first frequency band enters the RIS at the first emission angle and is emitted at the first reflection angle, and the beam of the maximum frequency of the first frequency band enters the RIS at the first emission angle and is emitted at the second reflection angle, and the difference between the first reflection angle and the second reflection angle is less than or equal to the preset threshold.

[0038] Through the above embodiment, the first device can determine the frequency width of the first frequency band according to the preset threshold. Compared with the solution with fixed frequency width, the above embodiment makes the error of reflection angle within the preset threshold range after the beams with frequencies within a frequency band are transmitted to the RIS at the same transmission angle, thereby improving the precoding performance without significantly increasing the system complexity.

[0039] In a third aspect, a communication device is provided, comprising a processor, wherein the processor is used to enable the communication device to execute the first aspect and any possible method of the first aspect, or to enable the communication device to execute the second aspect and any possible method of the second aspect, by executing a computer program or instruction, or by a processing circuit.

[0040] In a possible implementation, the communication device further includes a memory for storing the computer program or instruction. Further, the processor is specifically used to call and run the computer program or computer instruction stored in the memory, so that the processor implements any one of the implementations in the first aspect or the second aspect.

[0041] In a possible implementation, the communication device further includes a transceiver (also referred to as a communication interface), the transceiver being used to input and / or output signals through the communication interface. The processor is used to control the transceiver to transmit and receive signals.

[0042] In a fourth aspect, a communication device is provided, comprising a processing circuit (also referred to as a processor) and an input / output interface (also referred to as an interface circuit), the input / output interface being used to input and / or output signals, the processing circuit being used to execute the first aspect and any possible method of the first aspect; or the processing circuit being used to execute the second aspect and any possible method of the second aspect.

[0043] In a possible implementation, the processor is used to communicate with other devices through an interface circuit and execute the method in any one of the implementations of the first aspect or the second aspect. The processor includes one or more.

[0044] In a fifth aspect, a communication device is provided. The communication device may be a first device, or a device or module for executing the first device; the communication device may be a target device, or a device or module for executing the function of the target device.

[0045] In one possible implementation, the communication device may include a module or unit corresponding to each of the methods / operations / steps / actions described in the first aspect. The module or unit may be a hardware circuit, software, or a combination of a hardware circuit and software.

[0046] In another possible implementation, the communication device may include a module or unit corresponding to the method / operation / step / action described in the second aspect, and the module or unit may be a hardware circuit, or software, or a combination of hardware circuit and software.

[0047] In the sixth aspect, a computer-readable storage medium is provided, on which a computer program or instruction is stored. When the computer program or the instruction is run on a computer, the first aspect and any possible method of the first aspect are executed; or, the second aspect and any possible method of the second aspect are executed.

[0048] In the seventh aspect, a computer program product is provided, comprising a computer program or instructions, which, when executed on a computer, causes the first aspect and any possible method of the first aspect to be executed; or causes the second aspect and any possible method of the second aspect to be executed.

[0049] In an eighth aspect, a communication device is provided, comprising a processor, which is connected to a memory and is used to call a program stored in the memory to execute any possible method of the first aspect or the second aspect. The memory may be located inside the communication device or outside the communication device. The processor may include one or more.

[0050] In one implementation, the communication device of the third aspect, fourth aspect, and fifth aspect may be a chip or a chip system.

[0051] In a ninth aspect, a chip device is provided, comprising a processor for calling a computer program or computer instruction in a memory so that the processor executes any one of the implementation methods of the first or second aspect above.

[0052] Optionally, the processor is coupled to the memory via an interface.

[0053] In a tenth aspect, a communication system is provided, which includes a first device and a target device; the first device is used to execute the method shown in the first aspect, and the target device is used to execute the method shown in the second aspect.

[0054] The description of the beneficial effects of any of the third aspect to the tenth aspect etc. may refer to the description of the beneficial effects of the first aspect or the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of a communication system to which the present application is applicable.

[0056] Figure 2 It is a schematic diagram of an equivalent circuit of the RIS provided in an embodiment of the present application.

[0057] Figure 3 It is a schematic flow chart of a communication method provided in an embodiment of the present application.

[0058] Figure 4 It is a schematic diagram of a communication method provided in an embodiment of the present application.

[0059] Figure 5 It is a schematic diagram of multiple frequency bands provided in an embodiment of the present application.

[0060] Figure 6 It is a schematic block diagram of a communication device according to an embodiment of the present application.

[0061] Figure 7 It is a schematic block diagram of another communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0062] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0063] The technical solution provided by this application can be applied to various communication systems, such as the fifth generation (5 th generation, 5G) or new radio (NR) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, etc. The technical solution provided in this application can also be applied to future communication systems, such as the sixth generation (6 th The technical solution provided in this application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems or other communication systems.

[0064] Figure 1 It is a schematic diagram of a communication system to which the present application is applicable.

[0065] See also Figure 1 The communication system may include a network device, a RIS, and a terminal device. The terminal device may communicate with the network device through reflection of the RIS, and on the other hand, the network device may communicate with the terminal device through reflection of the RIS. The network device may also communicate directly with the terminal device without going through the RIS.

[0066] Among them, the network device is a device in the network used to access the terminal device to the wireless network. The network device can be a node in the wireless access network, which can also be called a base station, and can also be called a radio access network (RAN) node (or device). In addition, RAN can also be equivalent to the next generation radio access network (NG-RAN) in the layer 3 relay architecture. In other words, RAN can be NG-RAN. For ease of description, RAN is sometimes used below to refer to the access network device. It can be understood that RAN can also be an access network (AN) node (or device). The network device may include an evolved base station (NodeB or eNB or e-NodeB, evolutionary Node B) in a long term evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-A), such as a traditional macro base station eNB and a micro base station eNB in ​​a heterogeneous network scenario, or may include a next generation node B (next generation node B, gNB) in a 5G or NR system, or may include a gNB in ​​a 6G system, or may include a radio network controller (radio network controller, RNC), a node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a transmission reception point (transmission reception point, TRP), a home base station (for example, home evolved NodeB, or home Node B, HNB), a base band unit (base band unit, BBU), a base band pool BBU pool, or a WiFi access point (access point, AP), etc., or may include a centralized unit (centralized unit) in a cloud radio access network (cloud RAN) system. unit (CU) and distributed unit (DU), which is not limited in the embodiments of the present application.In the separate deployment scenario where the access network equipment includes CU and DU, CU supports protocols such as radio resource control (RRC), packet data convergence protocol (PDCP), and service data adaptation protocol (SDAP); DU mainly supports radio link control layer (RLC), media access control layer (MAC) and physical layer protocols.

[0067] Among them, the terminal device is a device with wireless transceiver function, which can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (for example, on airplanes, balloons and satellites, etc.). The terminal device can communicate with the core network via the radio access network (RAN) and exchange voice and / or data with the RAN. The terminal device can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver function, a mobile Internet device (MID), a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a smart home, etc. The embodiments of the present application do not limit the application scenarios. The terminal device may also be sometimes referred to as user equipment (UE), mobile station, remote station, etc. The embodiments of the present application do not limit the specific technology, device form, and name of the terminal device.

[0068] RIS may also be called intelligent reflecting surface (IRS), large intelligent surface (LIS), etc. The present application does not limit the name of RIS, and RIS may have other names. For ease of description, RIS is still used for introduction below, but those skilled in the art can understand that RIS may be replaced by other names.

[0069] RIS can be an artificial two-dimensional material with a sub-wavelength size. RIS can include metal, dielectric and adjustable elements. RIS can be equivalently characterized as a circuit including electromagnetic units such as resistors (R), inductors (L), capacitors (C). In this way, by adjusting the physical properties of the electromagnetic units (such as capacitance, resistance or inductance), the radiation characteristics of RIS can be changed, thereby realizing unconventional physical phenomena (such as non-specular reflection, negative refraction, wave absorption, focusing and polarization conversion, etc.), and then dynamically controlling the electromagnetic waves (or beams). Specifically, by controlling the bias voltage of adjustable elements such as varactor diodes, PIN switches, micro-electromechanical systems (MEMS) switches, liquid crystals or graphene in RIS, the electromagnetic behavior required by each electromagnetic unit can be generated.

[0070] RIS can be presented as a smart panel including multiple antenna arrays, each of which can be a passive reflector. By flexibly configuring the amplitude and phase of each antenna array, the purpose of controlling the fading of the wireless channel and forming the desired directional beam can be achieved. RIS can be installed on large planes (such as indoor walls or ceilings, outdoor buildings or signs) to reflect radio frequency (RF) energy around obstacles and create a virtual line of sight (LoS) propagation path between the transmitter and the receiver.

[0071] Multiple-input multiple-output (MIMO) technology uses resources in the spatial dimension to enable signals to obtain array gain, multiplexing, diversity gain or interference cancellation gain in space without increasing the bandwidth of the communication system, thereby exponentially increasing the capacity and spectrum efficiency of the communication system. A communication system that applies MIMO technology and RIS can be called a RIS-MIMO system. In a RIS-MIMO system, the receiving performance of the receiving end can be improved by precoding the beam transmitted by the transmitter. Specifically, the communication system can adjust the beam to transmit in a specific direction by regulating the phase, amplitude and other information of the electromagnetic unit in RIS, thereby reducing the transmission power of the beam, improving the spectrum efficiency, expanding the coverage of the beam and reducing interference from other factors. The above precoding scheme can also be called beamforming.

[0072] Based on the programmable characteristics of RIS, RIS can be used as a precoder located outside the transmitter. By designing the phase offset matrix, RIS can reflect and control the beam from the transmitter.

[0073] Figure 2 2 is a schematic diagram of an equivalent circuit 200 of a RIS provided in an embodiment of the present application. The equivalent circuit 200 of the RIS includes a path 210 and a path 220, and the path 210 is connected in parallel with the path 220. The path 210 includes a capacitor 211, an inductor 212, and a resistor 213, wherein the capacitor 211, the inductor 212, and the resistor 213 are connected in series. The path 220 includes an inductor 221. A beam from free space is input into the RIS, and the RIS regulates the beam according to the equivalent circuit 200 and then outputs it to free space. Exemplarily, the reflection coefficient of the RIS can be expressed by Formula 1. The reflection coefficient can represent the difference between the phase (or angle, direction, etc.) of the beam incident on the RIS and the phase (or angle, direction, etc.) of the beam emitted from the RIS.

[0074]

[0075] Where Z represents the impedance of the RIS, which is related to the capacitance, inductance, and resistance in the equivalent circuit. Z0 represents the impedance of free space. According to Kirchhoff's current law, the impedance Z of the above RIS can be expressed by formula 2.

[0076]

[0077] Wherein, Z1 is the impedance of the path 210, and Z1 is the impedance of the path 220. Z1 and Z1 can be specifically expressed by Formula 3 and Formula 4, respectively.

[0078]

[0079] Z2=j2πfL2 (Formula 4)

[0080] Wherein, j represents an imaginary unit, π is a pi constant, f is a frequency of the beam, L1 is an inductance value of the inductor 212, R is a resistance value of the resistor 213, and C is a capacitance value of the capacitor 211. L2 is an inductance value of the inductor 221. Combining Formula 2, Formula 3, and Formula 4, another method of expressing the impedance Z of the RIS can be obtained, as shown in Formula 5.

[0081]

[0082] From Formula 5, we know that the impedance Z of RIS is related to frequency, so the impedance Z of RIS can also be expressed as Z(f). Therefore, the reflection coefficient of RIS can be expressed by Formula 6.

[0083]

[0084] As can be seen from Formula 6, as the frequency of the beam changes, the reflection coefficient of RIS also changes. Therefore, beams of different frequencies and the same incident angle will be emitted at different angles after being reflected by RIS, and thus cannot be aligned with the receiving end, reducing the receiving performance of the receiving end. For example, at 10GHz frequency and 100M scheduling bandwidth, after the beams of the same incident angle are reflected by RIS, the angle difference between the reflected beam of the maximum frequency and the reflected beam of the minimum frequency is about 3 degrees, and the receiving performance of the link level simulation (LLS) will drop by about 5%.

[0085] Therefore, how to improve the receiving performance of the receiving end is an urgent problem to be solved.

[0086] Figure 3 300 is a schematic flow chart of a communication method 300 provided in an embodiment of the present application. The method 300 can improve the receiving performance of the receiving end. Figure 3 An embodiment of method 300 is introduced.

[0087] S310: The target device obtains first information.

[0088] The target device may be the second device or the RIS. The first device may communicate with the second device through reflection of the RIS. For example, the first device may send a reference signal (RS) or data to the second device through reflection of the RIS.

[0089] The first device is a transmitting end of the beam, and the second device is a receiving end of the beam. For example, in uplink transmission, the first device may be a terminal device, and the second device may be a network device. For another example, in downlink transmission, the first device may be a network device, and the second device may be a terminal device. For another example, in sidelink transmission, the first device may be a terminal device, and the second device may also be a terminal device.

[0090] The target device may be a device having control rights for the reflection weights of the RIS. For example, if the second device has control rights for the reflection weights of the RIS, the second device may be the target device. For another example, if the RIS itself has control rights for the reflection weights of the RIS, the RIS may be the target device.

[0091] The first information may be used to indicate a corresponding relationship between the first frequency band and the first emission angle.

[0092] The first frequency band may be one or more sub-bands or sub-carriers, etc., or the first frequency band may correspond to one or more resource blocks (RBs) or precoding resource block groups (PRGs). The present application does not limit the frequency width of the first frequency band. For example, the first frequency band may also be other frequency widths different from the above-mentioned sub-bands, sub-carriers, RBs or PRGs.

[0093] The first transmission angle may be the angle of the beam transmitted by the first device to the RIS. The first transmission angle may also have other names, such as transmission phase, transmission weight, transmission direction, etc.

[0094] As an example, the first information may directly indicate the correspondence between the first frequency band and the first emission angle. The first information may include an identifier of the first frequency band and an identifier of the first emission angle, so that the first information may directly indicate that there is a correspondence between the first frequency band and the first emission angle through the identifier of the first frequency band and the identifier of the first emission angle. For example, the first information includes an identifier of frequency band #1 and an identifier of emission angle #1, where the first frequency band is frequency band #1. The first information may indicate that there is a correspondence between frequency band #1 and emission angle #1.

[0095] As another example, the first information may indirectly indicate the correspondence between the first frequency band and the first transmission angle. The first information may include a reference frequency band and a transmission angle offset, and the reference frequency band corresponds to a reference angle. The first transmission angle may be determined based on the difference between the reference frequency band and the first frequency band and the transmission angle offset, and the determined first transmission angle has a correspondence with the first frequency band. For example, the first information includes frequency band #0 and a unit transmission angle offset Δ, the reference angle corresponding to frequency band #0 is W0, and the first frequency band is frequency band #1. If the difference between frequency band #0 and frequency band #1 is 3 frequency bands, the first transmission angle corresponding to frequency band #1 may be W0+3Δ, or W0-3Δ.

[0096] As shown in Formula 5, the reflection coefficient of RIS is related to the frequency, so the angle of the beam reflected by RIS (hereinafter referred to as the reflection angle) is related to the frequency and the transmission angle. When the frequency remains unchanged, the deviation of the transmission angle will affect the deviation of the reflection angle. On the other hand, when the transmission angle remains unchanged, the deviation of the frequency will affect the deviation of the reflection angle.

[0097] Exemplarily, the first transmission angle can be determined according to the frequency of the first frequency band, the target reflection angle and the voltage of the variable capacitor. The voltage of the variable capacitor affects the capacitance value of the equivalent circuit 200, thereby affecting the reflection coefficient of the RIS. The frequency of the first frequency band also affects the reflection coefficient of the RIS, for example, see Formula 5. The reflection coefficient can express the difference between the first transmission angle and the target reflection angle (or the difference between the first transmission direction and the target reflection direction, or the difference between the first transmission phase and the target reflection phase), so that the first transmission angle can be determined according to the reflection coefficient and the target reflection angle.

[0098] S320: The first device receives first information from the target device. Accordingly, the target device sends the first information to the first device.

[0099] The present application does not limit the transmission method of the first information. For example, the first information may be transmitted through a channel between the first device and the target device. For another example, the first information may be sent from the first device to the second device through the reflection of RIS.

[0100] S330: The first device transmits a first beam to the RIS at the first transmission angle.

[0101] The first beam corresponds to the first frequency band, and after entering the RIS, the first beam is emitted toward the second device at a target reflection angle.

[0102] The first beam corresponds to the first frequency band, which can also be understood as the frequency of the first beam is within the first frequency band. The target reflection angle can be an angle pointing to, aiming at, or aligning the second device. The target reflection angle can also be called a target phase, a target weight, or a target direction, etc. This application does not limit the name of the target reflection angle, and the target reflection angle can also have other names.

[0103] Through the above embodiments, the first device can determine to transmit a beam of a certain frequency band at a certain transmission angle according to the correspondence between the frequency band and the transmission angle, so that the beam enters the RIS and then is emitted toward the second device at a target reflection angle, that is, the beam reflected by the RIS can be aligned with the receiving end, thereby improving the receiving performance of the receiving end.

[0104] Optionally, in another implementation scenario of the above embodiment, the first information is specifically used to indicate the correspondence between multiple frequency bands and multiple transmission angles, the first frequency band is one of the multiple frequency bands, and the first transmission angle is one of the multiple transmission angles.

[0105] The first information may include a first mapping table, and the first mapping table includes identifiers of multiple frequency bands and identifiers of multiple transmission angles. For example, the first mapping table may include an identifier of frequency band #1, an identifier of frequency band #2, an identifier of transmission angle #1, and an identifier of transmission angle #2, and the first information may indicate that there is a corresponding relationship between frequency band #1 and transmission angle #1, and there is a corresponding relationship between frequency band #2 and transmission angle #2.

[0106] The first frequency band may be any one of a plurality of frequency bands, and the first emission angle may be any one of a plurality of emission angles.

[0107] In some embodiments, a beam corresponding to one of the multiple frequency bands is emitted at the target reflection angle (or directed toward the second device) after entering the RIS at the emission angle corresponding to the one frequency band. In other words, the first information is specifically used to indicate the corresponding relationship between M frequency bands and M emission angles, where M is a positive integer greater than 1. Among them, a beam corresponding to the mth frequency band among the M frequency bands is emitted at the target reflection angle (or directed toward the second device) after entering the RIS at the mth emission angle, wherein the mth frequency band has a corresponding relationship with the mth emission angle, m=1,...,M.

[0108] Figure 4 It is a schematic diagram of a communication method 300 provided in an embodiment of the present application.

[0109] See also Figure 4, the first device can transmit a beam corresponding to frequency band #1 to the RIS at a transmission angle #1, and transmit a beam corresponding to frequency band #2 to the RIS at a transmission angle #2. After being reflected by the RIS, the beams of the above two frequency bands will be emitted to the second device at the same reflection angle.

[0110] Figure 4 This is merely exemplary, and it is to be understood that the first device may also transmit beams of other frequency bands at other transmission angles, and these beams may also be directed toward the second device at the same reflection angle.

[0111] Through the above embodiments, the first information can indicate the correspondence between multiple frequency bands and multiple transmission angles. On the one hand, the first information can indicate the correspondence between the first frequency band and the first transmission angle. On the other hand, the first information can also indicate the correspondence between other frequency bands and other transmission angles, so that the beams transmitted by the first device on more frequency bands can be aligned with the receiving end, thereby improving the receiving performance of the receiving end on multiple frequency bands.

[0112] Optionally, in another implementation scenario of the above embodiment, the method 300 further includes: the first device receives the second information, and correspondingly, the target device sends the second information to the first device.

[0113] Among them, the second information can be used to indicate the correspondence between a reference frequency band and a reference transmission angle; and the first information is specifically used to indicate the correspondence between multiple frequency band offsets and multiple transmission angle offsets, there is a first frequency band offset between the first frequency band and the reference frequency band, the first frequency band offset corresponds to a first transmission angle offset, the first transmission angle is determined based on the reference transmission angle and the first transmission angle offset, the first frequency band offset is one of the multiple frequency band offsets, and the first transmission angle offset is one of the multiple transmission angle offsets.

[0114] As an example, the second information may include an identifier of a reference frequency band. By indicating an identifier of a frequency band, the second information may indicate that the frequency band is a reference frequency band, and the transmission angle corresponding to the frequency band is a reference transmission angle. In a related technical solution, the first device may obtain a transmission angle (or referred to as a transmission direction, a transmission weight, a transmission phase, etc.), and the transmission angle is applied to beams of all frequency bands. In an embodiment of the present application, the transmission angle in the related technical solution may be used as a reference transmission angle. In this way, the first solution further obtains the identifier of the reference frequency band in the embodiment of the present application on the basis of obtaining the transmission angle in the related technical solution, and determines that the transmission angle corresponding to the reference frequency band in the embodiment of the present application is the reference transmission angle. Different from the related technical solution, the reference transmission angle in the embodiment of the present application is only applied to the beam of the reference frequency band.

[0115] The present application does not limit the method for obtaining the reference transmission angle. The first device can determine the reference transmission angle. Alternatively, other devices can determine the reference transmission angle and send it to the second device. The reference transmission angle can also be called a reference transmission direction, a reference transmission weight, a reference transmission phase, etc. In some embodiments, the reference transmission angle can be determined by a network device. In this way, when the first device is a network device, the first device can determine the reference transmission angle. When the first device is not a network device, the first device can receive information indicating the reference transmission angle from the network device.

[0116] As another example, the second information may include an identifier of a reference frequency band and an identifier of a reference transmission angle. For example, the second information includes an identifier of frequency band #0 and an identifier of transmission angle #0, and the second information may indicate that frequency band #0 corresponds to transmission angle #0, and that frequency band #0 is a reference frequency band and transmission angle #0 is a reference transmission angle.

[0117] The frequency band offset can describe the offset between a frequency band and a reference frequency band. For example, the reference frequency band is frequency band #1, and the frequency band offset of frequency band #5 is 4 frequency bands. The transmission angle offset can describe the offset between a transmission angle and a reference transmission angle. For example, transmission angle #5 is 0.05 degrees, transmission angle #1 is 0.01 degrees, and transmission angle #1 is the reference transmission angle. Then, the transmission angle offset of transmission angle #5 can be 0.04 degrees, or it can also be described as 4 unit transmission angle offsets Δ, or, 4Δ.

[0118] As an example, the first information may include a second mapping table, and the second mapping table includes identifiers of multiple frequency band offsets and identifiers of multiple transmission angle offsets. For example, the second mapping table includes frequency band offset 1, frequency band offset 2, frequency band offset 3, and transmission angle offset 1, transmission angle offset 2, and transmission angle offset 3. Among them, frequency band offset 1 corresponds to transmission angle offset 1, frequency band offset 2 corresponds to transmission angle offset 2, and frequency band offset 3 corresponds to transmission angle offset 3.

[0119] The transmission angle offset may also be called a transmission phase offset, a transmission direction offset, a transmission weight offset, etc. The present application does not limit the specific name of the transmission angle offset. The transmission angle offset may also have other names.

[0120] As another example, the first information may include a unit transmission angle offset. Since the second information indicates the reference frequency band, the transmission angle offset of the frequency band after the frequency band is offset relative to the reference frequency band may be determined based on the unit transmission angle offset. For example, if the frequency band is offset by 3 frequency bands relative to the reference frequency band, it may be determined that the transmission angle offset of the frequency band after the frequency band is offset is 3 times the unit transmission angle offset.

[0121] The second information and the first information may be carried in the same message or in different messages. For example, the second information and the first information may be carried in one indication information, and the indication information includes the identifier of the reference frequency band and the unit transmission angle offset. For the specific indication method, please refer to the example in which the first information includes the unit transmission angle offset and the example in which the second information includes the identifier of the reference frequency band, which will not be described in detail here.

[0122] Through the above embodiment, the first device can determine the correspondence between the reference frequency band and the reference transmission angle according to the second information, and determine the correspondence between multiple frequency band offsets and multiple transmission angle offsets according to the first information. Then, the first device can determine the transmission angle of the first frequency band according to the first information and the second information, and can determine the transmission angles of other frequency bands. In the above embodiment, the first device receives information indicating the reference amount and the offset, which reduces the communication overhead compared to the scheme indicating the transmission angle of each frequency band.

[0123] Optionally, in another implementation scenario of the above embodiment, the first information includes a unit transmission angle offset, and the unit transmission angle offset is a transmission angle offset between adjacent frequency bands.

[0124] The unit transmission angle offset can also be understood as the difference between the transmission angles of the frequency band after the offset and the frequency band before the offset for each frequency band offset. For example, frequency band #2 is offset by one frequency band to obtain frequency band #3, frequency band #2 corresponds to transmission angle #2, and frequency band #3 corresponds to transmission angle #3. Then, the difference between transmission angle #3 and transmission angle #2 can be the unit transmission angle offset.

[0125] The unit transmission angle offset may also be called a unit transmission phase offset, a unit transmission direction offset, a unit transmission weight offset, etc. This application does not limit the specific name of the unit transmission angle offset. The unit transmission angle offset may also have other names.

[0126] Through the above embodiment, the first information may include a unit transmission angle offset. In this way, the first device can determine the transmission angle of the first frequency band according to the first information and the second information, and can determine the transmission angles of other frequency bands. The above embodiment further reduces communication overhead.

[0127] Optionally, in another implementation scenario of the above embodiment, the first information is information received by the first device from a device having control rights of the reflection weight of the RIS.

[0128] Without loss of generality, assuming that the first device transmits a beam to the second device, the signal (or beam) received by the second device can be expressed by Formula 7 after removing the pilot signal.

[0129] Y=F H *diag(W)*H+H 1-2 (Formula 7)

[0130] Wherein, Y represents the signal received by the second device, F H represents the channel between the first device and the RIS, diag(W) represents the reflection weight of the RIS, H represents the channel between the RIS and the second device, and H 1-2 It indicates the channel between the first device and the second device. It can be seen that controlling the reflection weight of RIS can affect the receiving effect of the receiving end.

[0131] Through the above embodiment, the information indicating that the first frequency band corresponds to the first transmission angle can come from the device having the control right of the reflection weight of the RIS. The device having the control right of the reflection weight of the RIS can determine that the beam of the first frequency band transmitted to the RIS at the first transmission angle can be reflected to the second device at the target reflection angle, so that the beam of the first frequency band can improve the receiving effect of the receiving end.

[0132] Optionally, in another implementation scenario of the above embodiment, the device having the control right of the reflection weight of the RIS is the second device or the RIS.

[0133] As an example, in the case where the control right of the reflection weight of the RIS is in the RIS itself, if the first device is a network device and the second device is a terminal device, the RIS can send the first information to the network device to achieve downlink transmission. If the first device is a terminal device and the second device is a network device, the RIS can send the first information to the terminal device to achieve uplink transmission.

[0134] As another example, in the case where the control right of the reflection weight of the RIS is in the network device, if the first device is the network device and the second device is the terminal device, the network device can determine the correspondence between the first frequency band and the first transmission angle to achieve downlink transmission. If the first device is the terminal device and the second device is the network device, the network device (i.e., the second device) can send the first information to the terminal device (i.e., the first device) to achieve uplink transmission.

[0135] As another example, in the case where the control right of the reflection weight of the RIS is in the terminal device, if the first device is a network device and the second device is a terminal device, the terminal device (i.e., the second device) can send the first information to the network device (i.e., the first device) to achieve downlink transmission. If the first device is a terminal device and the second device is a network device, the terminal device can determine the correspondence between the first frequency band and the first emission angle to achieve uplink transmission.

[0136] Optionally, in another implementation scenario of the above embodiment, the method 300 further includes: the first device receives third information. Accordingly, the target device sends the third information to the first device.

[0137] The third information may be used to determine the frequency width of the first frequency band.

[0138] As an example, the third information may include the frequency width of the first frequency band, or may include the frequency widths of multiple frequency bands, wherein the multiple frequency bands include the first frequency band.

[0139] Through the above embodiment, the first device can determine the frequency width of the first frequency band according to the third information, so that the first device can transmit a beam within the frequency range of the first frequency band.

[0140] Optionally, in another implementation scenario of the above embodiment, the multiple frequency bands are divided into at least two frequency band groups, wherein the third information can be specifically used to indicate the frequency width of the frequency bands included in each of the at least two frequency band groups, wherein the at least two frequency band groups include a first frequency band group and a second frequency band group, the frequency width of the frequency bands included in the first frequency band group is different from the frequency width of the frequency bands included in the second frequency band group, and the first frequency band group includes the first frequency band.

[0141] The frequency width of a frequency band in a frequency band group is the quotient of the frequency width of the frequency band group and the number of frequency bands in the frequency band group. In other words, the frequency widths of the frequency bands in a frequency band group are evenly distributed. In other words, the frequency width of a frequency band in a frequency band group is equal to the frequency widths of other frequency bands in the frequency band group.

[0142] According to the aforementioned embodiment, the first information can be used to indicate the correspondence between the first frequency band and the first emission angle, and the first device can transmit a beam of the first frequency band to the RIS at the first emission angle, and the beam is reflected by the RIS and emitted to the second device at the target reflection angle. In addition, the first information can also be used to indicate the correspondence between the second frequency band and the second emission angle, and the first device can transmit a beam of the second frequency band to the RIS at the second emission angle, and the beam is also reflected by the RIS and emitted to the second device at the target reflection angle.

[0143] It can be seen that for beams of different frequency bands, if it is desired that the beam be directed toward the second device at a target reflection angle after being reflected by the RIS, it is necessary to direct the beam toward the RIS at different transmission angles. Part of the principle can be seen in Formula 6. When the frequency changes, the reflection coefficient of the RIS also changes, so that beams of different frequency bands and different transmission angles can be directed toward the second device at similar reflection angles. It is understandable that in the same frequency band, beams of different frequencies are directed toward the RIS at the same transmission angle, and the reflection angles of these beams after being reflected by the RIS will also be slightly different. However, these reflection angles are within a certain error range. For example, the difference between the maximum reflection angle and the minimum reflection angle can be less than or equal to a preset threshold.

[0144] Furthermore, the variation trend of the impedance with frequency in Z(f), or the slope of the impedance to frequency, or the slope of Z(f), can affect the variation trend of the reflection coefficient of RIS with frequency. It should be noted that the variation trend of the impedance with frequency in Z(f) is not linear, or not uniform, and therefore, the variation trend of the reflection coefficient of RIS with frequency is not linear, or not uniform. For example, in the range of 0-10MHz, the variation trend of the reflection coefficient of RIS with frequency is large. If the above preset threshold is to be met, a smaller frequency width needs to be configured for the frequency band within the frequency range of 0-10MHz. For another example, in the range of 10-20MHz, the variation trend of the reflection coefficient of RIS with frequency is small. Then, configuring a larger frequency width for the frequency band within the frequency range of 10-20MHz can meet the above preset threshold.

[0145] Exemplarily, the third information may indicate Table 1. Table 1 shows three frequency band groups, and the width of the frequency bands included in each frequency band group is different.

[0146] Table 1

[0147] Band Group (expressed in frequency range) Frequency width of the band 10.1-10.5GHz 4 10.5-10.7GHz 2 10.7-11.3GHz 8

[0148] The frequency band group can be represented by a frequency range. The frequency width of the frequency band in the frequency band group of 10.1-10.5 GHz is 4. For example, when the frequency band is a PRG, a PRG in the frequency range of 10.1-10.5 GHz includes 4 physical resource blocks (PRBs), or the PRG value in the frequency range of 10.1-10.5 GHz is 4. The frequency width of the frequency band in the frequency band group of 10.5-10.7 GHz is 2. For example, when the frequency band is a PRG, a PRG in the frequency range of 10.5-10.7 GHz includes 2 PRBs, or the PRG value in the frequency range of 10.5-10.7 GHz is 2. Among them, the frequency width of the frequency band in the frequency band group of 10.7-11.3 GHz is 8. For example, when the frequency band is a PRG, a PRG in the frequency range of 10.7-11.3 GHz includes 8 PRBs, or in other words, the PRG value in the frequency range of 10.7-11.3 GHz is 8. The frequency width of the frequency band can also be called the precoding granularity or the size of the PRG, and the frequency width of the frequency band can also be understood as the number of PRBs with the same corresponding precoding function.

[0149] That is, the PRG values ​​in different frequency ranges are different, or there are multiple PRG values ​​in the full frequency band. That is, the number of PRBs for beams in different frequency ranges is different, or there are multiple continuous PRBs for beams in the full frequency band.

[0150] The beams on a PRG can use the same precoding. In other words, the beams within the frequency range of a PRG can use the same precoding. Beams on different PRGs can use the same precoding or different precoding. Beams using the same precoding can also be understood as the same type of beam, and beams using different precoding can be understood as different beams. Therefore, a PRG can also be understood as corresponding to a beam, and beams within the frequency width of a PRG can be understood as the same type of beam.

[0151] As an example, the third information may include a third mapping table. The third mapping table may include an identifier of a frequency band group and a frequency width indicating a PRG. As shown in Table 1, the identifier of the frequency band group may be a frequency range, such as 10.1-10.5 GHz. The identifier of the frequency band group may also be other identifiers.

[0152] As another example, the third information may include the frequency width of the frequency band. In this way, the first device may determine the frequency range corresponding to the frequency band group based on other information. For example, the first device may receive a piece of information including the frequency range corresponding to the frequency band group. Alternatively, the information may include a starting frequency and a frequency width of the frequency band group, and a frequency range of a frequency width starting from the starting frequency is regarded as a frequency band group. In this way, the spectrum is divided into multiple frequency band groups by the frequency width. Alternatively, the frequency band group may be specified by a protocol, for example, the protocol may specify the frequency width to divide the spectrum into multiple frequency band groups according to the frequency width, or the protocol may specify a frequency band group of any frequency width.

[0153] Assume that frequency band group #1 includes frequency band #1, frequency band #2, and frequency band #3. As a combination of the third information and the first information, when the third information indicates the frequency width of the frequency bands included in each frequency band group, the first information may include the identifier of the first frequency band and the identifier of the first transmission angle. For example, the third information indicates that the frequency width of the frequency bands included in frequency band group #1 is 4 PRBs. Then, the first information may include the identifier of frequency band #1 and the identifier of transmission angle #1. In this way, the first device can determine the frequency range corresponding to frequency band #1 based on the first information and the third information, so as to transmit a beam within the frequency range to the RIS at transmission angle #1.

[0154] As another combination of the third information and the first information, when the third information indicates the frequency width of the frequency bands included in each frequency band group, the first information may include the identifier of the reference frequency band and the unit transmission angle offset. For example, the third information indicates that the frequency width of the frequency bands included in frequency band group #1 is 4 PRBs. Then, the first information may include the identifier of frequency band #1 and the unit transmission angle offset Δ. The first device may determine the frequency ranges corresponding to frequency band #1, frequency band #2, and frequency band #3 respectively according to the third information. The first device may determine frequency band #1 as the reference identifier according to the first information, thereby determining that the transmission angle corresponding to frequency band #1 is the reference transmission angle, the transmission angle corresponding to frequency band #2 is the reference transmission angle + Δ, and the transmission angle corresponding to frequency band #3 is the reference transmission angle + 2Δ. Thus, the first device may obtain the transmission angles corresponding to each frequency band in frequency band group #1. When the third information includes the frequency widths of more frequency band groups, the first device may determine the transmission angles corresponding to each frequency band in multiple frequency band groups according to the first information and the third information.

[0155] In the relevant technical solution, the frequency width of the frequency band of the same terminal device (or UE) is fixed. For example, the PRG size in the frequency range of 10.1-10.5GHz is 2, and the PRG size in the frequency range of 10.5-10.7GHz and 10.7-11.3GHz is also 2. In other words, there is no concept of frequency band group in the relevant technical solution, and the frequency width of the frequency band is fixed in the full frequency range. In an embodiment of the present application, the frequency width of each frequency band of the first device (for example, a terminal device or a network device, etc.) may be different. For example, the UE scheduling bandwidth is 200MHz, and the frequency selectivity of the bandwidth channel of the first 100MHz is large. Then, the frequency width of the frequency band within the first 100MHz needs to be set smaller, and the frequency selectivity of the bandwidth channel of the last 100MHz is small. Then, the frequency width of the frequency band within the last 100MHz needs to be set larger. Therefore, in some embodiments, the first device can simultaneously support the frequency widths of multiple frequency bands, or multiple PRG sizes, or multiple precoding granularities.

[0156] The above frequency selectivity can describe the amplitude and phase fluctuations of the wireless channel in the entire frequency domain bandwidth. Frequency selectivity can also be called the degree of channel fluctuation. For example, if the frequency selectivity is large, or the channel fluctuation degree is fast, the frequency width of the frequency band is small; if the frequency selectivity is small, or the channel fluctuation degree is slow, or the channel is flat, the frequency width of the frequency band is large. For example, frequency selectivity can be the change trend of impedance with frequency in the above Z(f).

[0157] Through the above embodiment, the third information can indicate the frequency width of the frequency bands included in each frequency band group, which enables the first device to determine the frequency width of each frequency band according to the third information, so that the first device can transmit a beam within the frequency range of the first frequency band.

[0158] Optionally, in another implementation scenario of the above embodiment, the third information includes a preset threshold, and the target reflection angle includes a first reflection angle and a second reflection angle, wherein the beam with the minimum frequency of the first frequency band enters the RIS at the first emission angle and is emitted at the first reflection angle, and the beam with the maximum frequency of the first frequency band enters the RIS at the first emission angle and is emitted at the second reflection angle, and the difference between the first reflection angle and the second reflection angle is less than or equal to the preset threshold.

[0159] It is understandable that in a frequency band, the difference in reflected angles emitted after the beam is emitted into the RIS at the same emission angle is less than a preset threshold. For example, the preset threshold may indicate a phase difference (or direction difference, angle difference) of 0.01 degrees.

[0160] Therefore, the frequency width of a frequency band depends on the impedance variation trend of Z(f) corresponding to the frequency band and the preset threshold. When the preset threshold is constant, if the impedance variation trend of Z(f) with frequency is greater, the frequency width of the frequency band is wider; if the impedance variation trend of Z(f) with frequency is smaller, the frequency width of the frequency band is narrower.

[0161] Figure 5 is a schematic diagram of multiple frequency bands provided in an embodiment of the present application. Figure 5 , band #1, band #2, band #3 and band #4 are located on the frequency vertical axis, and the upward direction of the vertical axis indicates the direction of increasing frequency. Band #1, band #2, band #3 and band #4 are different. The left side of the frequency vertical axis represents the beam incident on RIS, wherein the left dotted line represents the emission angle corresponding to band #1. It can be seen that the emission angles corresponding to different frequency bands are different. The right side of the frequency vertical axis represents the beam emitted from RIS after reflection from RIS. Among them, the right dotted line represents the reflection angle corresponding to band #1. It can be seen that the reflection angles corresponding to different frequency bands are the same. The reason why the frequency widths of band #1, band #2, band #3 and band #4 are set to be different is because the impedance of Z(f) corresponding to band #1, band #2, band #3 and band #4 has different trends in change with frequency. For example, Figure 5 The frequency widths in the sequence from large to small are band #4, band #1, band #3, and band #2. The impedance of Z(f) changes with frequency in the sequence from small to large: band #4, band #1, band #3, and band #2.

[0162] The above frequency bands may also correspond to PRGs. For example, frequency band #1 corresponds to PRG #1, and frequency band #2 corresponds to PRG #2.

[0163] Through the above embodiment, the first device can determine the frequency width of the first frequency band according to the preset threshold. Compared with the solution with fixed frequency width, the above embodiment makes the error of reflection angle within the preset threshold range after the beams with frequencies within a frequency band are transmitted to the RIS at the same transmission angle, thereby improving the precoding performance without significantly increasing the system complexity.

[0164] The method 300 provided in the present application is used to perform simulation tests, and the reflection angle is almost not deflected, and the receiving performance of the receiving end is improved by 9.13%. The simulation test is based on the conditions shown in Table 2.

[0165] Table 2

[0166]

[0167]

[0168] The following is an introduction to the device embodiment corresponding to the method embodiment of the present application. The following is only a brief introduction to the device, and the specific implementation steps and details of the scheme can refer to the method embodiment above.

[0169] In order to implement the functions in the method provided in this application, the terminal device and the network device may include a hardware structure and / or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0170] Figure 6 6 is a schematic block diagram of a communication device 600 according to an embodiment of the present application. The communication device 600 includes a processor 610 and a communication interface 620, and the processor 610 and the communication interface 620 may be interconnected via a bus 630. The communication device 600 may be a first device or a target device.

[0171] Optionally, the communication device 600 may further include a memory 640. The memory 640 includes, but is not limited to, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), or a portable read-only memory (CD-ROM), and the memory 640 is used for related instructions and data. The memory 640 may be integrated with the processor 610 or separately provided.

[0172] The processor 610 may be one or more central processing units (CPUs). In the case where the processor 610 is a CPU, the CPU may be a single-core CPU or a multi-core CPU. The processor 610 may be a signal processor, a chip, or other integrated circuit that can implement the method of the present application, or a portion of the circuit used for processing functions in the aforementioned processor, chip, or integrated circuit. In addition, the communication interface 620 may also be an input / output interface, which is used for input or output of signals or data, or may be an input / output circuit.

[0173] When the communication device 600 is a first device, illustratively, the communication interface 670 is used to perform the following operations: receiving first information, wherein the first information is used to indicate a correspondence between a first frequency band and a first transmission angle. The processor 610 is used to perform the following operations: transmitting a first beam to the RIS at the first transmission angle, the first beam corresponding to the first frequency band, and the first beam is emitted to the second device at a target reflection angle after entering the RIS.

[0174] When the communication device 600 is a target device, illustratively, the processor 610 is used to perform the following operations: obtain first information, wherein the target device is a second device or a RIS, and the first information is used to indicate a correspondence between a first frequency band and a first transmission angle, wherein a beam corresponding to the first frequency band transmitted to the RIS at the first transmission angle is transmitted to the second device at a target reflection angle after entering the RIS. The communication interface 670 is used to perform the following operations: send the first information to the first device.

[0175] The above contents are only exemplary descriptions. When the communication device 600 is the first device or the target device, it will be responsible for executing the methods or steps related to the first device or the target device in the above method embodiments.

[0176] It is understandable that when the communication device 600 is a first device or a target device, the communication interface 620 may also be referred to as a transceiver. The transceiver may include a transmitter and a receiver, the transmitter is used to perform a sending operation, and the receiver is used to perform a receiving operation. For example, the processor 610 is used to control the transceiver to receive and / or send a signal.

[0177] It should be noted that the communication device 600 may include a transmitter but not a receiver. Alternatively, the communication device 600 may include a receiver but not a transmitter. Specifically, it may depend on whether the above solution executed by the communication device 600 includes a sending action and a receiving action.

[0178] The above description is only an exemplary description. For specific content, please refer to the content shown in the above method embodiment. Figure 6 The implementation of each operation in can also refer to Figures 3 to 6 The corresponding description of the method embodiment shown.

[0179] For example, the communication device 600 may be used to perform Figure 3 The scheme shown.

[0180] When the communication device 600 is a first device: the communication interface 620 is used to receive first information.

[0181] When the communication device 600 is the target device: the communication interface 620 is used to send the first information to the first device.

[0182] For other implementations, please refer to the aforementioned Figure 3 It should be understood that the specific process of each component executing the above corresponding process has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0183] Figure 7 700 is a schematic block diagram of another communication device 700 according to an embodiment of the present application. The communication device 700 may be a first device or a target device, or may be a chip or module in the first device or the target device, for implementing Figures 3 to 6 For details of the method involved in the illustrated embodiment, please refer to the relevant introduction in the above method embodiment.

[0184] The communication device 700 includes a transceiver unit 710. The transceiver unit 710 is exemplarily introduced below.

[0185] The transceiver unit 710 may include a sending unit and a receiving unit. The sending unit is used to perform a sending action of the communication device, and the receiving unit is used to perform a receiving action of the communication device. For ease of description, the embodiment of the present application combines the sending unit and the receiving unit into one transceiver unit. A unified description is given here, and no further description is given later. The transceiver unit 710 can implement corresponding communication functions. The transceiver unit 710 can also be called a communication interface or a communication module.

[0186] It should be noted that the communication device 700 may include a sending unit but not a receiving unit. Alternatively, the communication device 700 may include a receiving unit but not a sending unit. Specifically, it may depend on whether the above solution executed by the communication device 700 includes a sending action and a receiving action.

[0187] When the communication device 700 is a first device, illustratively, the transceiver unit 710 is used to receive first information and the like.

[0188] Optionally, the communication device 700 may further include a processing unit 720, which is used to execute the content of the first device involving processing, coordination and other steps.

[0189] When the communication device 700 is a target device, illustratively, the transceiver unit 710 is used to send the first information, etc. to the first device.

[0190] The above contents are only exemplary descriptions. When the communication device 700 is the first device or the target device, it will be responsible for executing the methods or steps related to the first device or the target device in the above method embodiments.

[0191] Optionally, the communication device 700 further includes a storage unit 730, which is used to store a program or code for executing the aforementioned method. In other words, the storage unit 730 can be used to store instructions and / or data, and the processing unit 720 can read the instructions and / or data in the storage unit 730 so that the communication device 700 implements the aforementioned method embodiment. For example, the communication device 700 can be used to execute Figure 3 The scheme shown.

[0192] When the communication device 700 is a first device: the transceiver unit 710 is used to receive first information, wherein the first information is used to indicate the correspondence between the first frequency band and the first transmission angle; and is used to transmit a first beam to the RIS at the first transmission angle, the first beam corresponding to the first frequency band, and the first beam is emitted to the second device at a target reflection angle after entering the RIS.

[0193] In the case where the communication device 700 is a target device: the processing unit 720 is used to obtain first information, wherein the target device is a second device or a RIS, and the first information is used to indicate a correspondence between a first frequency band and a first transmission angle, wherein a beam corresponding to the first frequency band transmitted to the RIS at the first transmission angle is emitted to the second device at a target reflection angle after entering the RIS; the transceiver unit 710 is used to obtain first information, wherein the target device is a second device or a RIS, and the first information is used to indicate a correspondence between a first frequency band and a first transmission angle, wherein a beam corresponding to the first frequency band transmitted to the RIS at the first transmission angle is emitted to the second device at a target reflection angle after entering the RIS.

[0194] For other implementations, please refer to the aforementioned Figure 3 It should be understood that the specific process of each component executing the above corresponding process has been described in detail in the above method embodiment, and for the sake of brevity, it will not be repeated here.

[0195] Figure 6 and Figure 7 The device embodiment shown is used to implement Figures 3 to 6 The content described. Figure 6 and Figure 7 The specific execution steps and methods of the device shown can refer to the contents described in the aforementioned method embodiment.

[0196] The present application also provides a communication device, including a processor and a memory, wherein the memory is used to store instructions, and the processor is used to call and run the instructions stored in the memory, so that the communication device executes the method of the target device or the first device or the target device in the above embodiments.

[0197] The present application also provides a chip, including a processor, for calling and executing instructions stored in a memory from the memory, so that a communication device equipped with the chip executes the methods in the above embodiments.

[0198] The present application also provides another chip, including: an input interface, an output interface, and a processor, wherein the input interface, the output interface, and the processor are connected via an internal connection path, and the processor is used to execute the code in the memory, and when the code is executed, the processor is used to execute the method in each of the above embodiments. Optionally, the chip also includes a memory, and the memory is used to store computer programs or codes.

[0199] The present application also provides a processor, which is coupled to a memory and is used to execute the method and function involving the first device or the target device in any of the above embodiments.

[0200] In another embodiment of the present application, a computer program product including a computer program or instructions is provided. When the computer program product is run on a computer, the method of the above embodiment is implemented.

[0201] The present application also provides a computer program. When the computer program is executed in a computer, the methods of the aforementioned embodiments are implemented.

[0202] In another embodiment of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a computer, the methods of the aforementioned embodiments are implemented.

[0203] The present application also provides a communication system, which may include a first device and a target device. The target device may be used to perform the above Figures 3 to 6 In the embodiment shown, the target device performs the operation. The first device can be used to perform the above Figures 3 to 6 The operations performed by the first device in the illustrated embodiment.

[0204] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0205] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0206] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0207] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0208] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0209] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0210] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: include: The first device receives first information, wherein the first information is used to indicate a correspondence between a first frequency band and a first transmission angle; The first device transmits a first beam to a configurable smart surface RIS at the first transmission angle, the first beam corresponds to the first frequency band, and the RIS is used to reflect the first beam.

2. The method according to claim 1, characterized in that The first information is specifically used to indicate a correspondence between multiple frequency bands and multiple transmission angles, the first frequency band is one of the multiple frequency bands, and the first transmission angle is one of the multiple transmission angles.

3. The method according to claim 1, characterized in that Also includes: The first device receives second information, where the second information is used to indicate a corresponding relationship between a reference frequency band and a reference transmission angle; as well as The first information is specifically used to indicate the correspondence between multiple frequency band offsets and multiple transmission angle offsets, there is a first frequency band offset between the first frequency band and the reference frequency band, the first frequency band offset corresponds to a first transmission angle offset, the first transmission angle is determined based on the reference transmission angle and the first transmission angle offset, the first frequency band offset is one of the multiple frequency band offsets, and the first transmission angle offset is one of the multiple transmission angle offsets.

4. The method according to claim 3, characterized in that The first information includes a unit transmission angle offset, where the unit transmission angle offset is a transmission angle offset between adjacent frequency bands.

5. The method according to any one of claims 1 to 4, characterized in that The first information is information received by the first device from a device having control rights of the reflection weight of the RIS.

6. The method according to claim 5, characterized in that The device having the control right of the reflection weight of the RIS is the target receiving end of the first beam or the RIS.

7. The method according to any one of claims 1 to 6, characterized in that Also includes: The first device receives third information, where the third information is used to determine a width of the first frequency band.

8. The method according to claim 7, characterized in that The multiple frequency bands are divided into at least two frequency band groups, wherein: The third information is specifically used to indicate the frequency width of the frequency band included in each of the at least two frequency band groups, wherein the at least two frequency band groups include a first frequency band group and a second frequency band group, the frequency width of the frequency band included in the first frequency band group is different from the frequency width of the frequency band included in the second frequency band group, and the first frequency band group includes the first frequency band.

9. The method according to claim 7, characterized in that: The third information includes a preset threshold, wherein: The beam with the minimum frequency in the first frequency band enters the RIS at the first transmission angle and is emitted at the first reflection angle, and the beam with the maximum frequency in the first frequency band enters the RIS at the first transmission angle and is emitted at the second reflection angle, and the difference between the first reflection angle and the second reflection angle is less than the preset threshold.

10. A communication method, characterized in that: include: The target device acquires first information, wherein the first information is used to indicate a correspondence between a first frequency band and a first emission angle, wherein a beam corresponding to the first frequency band emitted to a configurable smart surface RIS at the first emission angle enters the RIS and then is emitted to a second device at a target reflection angle; The target device sends the first information to the first device.

11. The method according to claim 10, characterized in that The first information is specifically used to indicate a correspondence between multiple frequency bands and multiple transmission angles, the first frequency band is one of the multiple frequency bands, and the first transmission angle is one of the multiple transmission angles.

12. The method according to claim 10, characterized in that Also includes: The target device sends second information to the first device, where the second information is used to indicate a corresponding relationship between a reference frequency band and a reference transmission angle; as well as The first information is specifically used to indicate the correspondence between multiple frequency band offsets and multiple transmission angle offsets, there is a first frequency band offset between the first frequency band and the reference frequency band, the first frequency band offset corresponds to a first transmission angle offset, the first transmission angle is determined based on the reference transmission angle and the first transmission angle offset, the first frequency band offset is one of the multiple frequency band offsets, and the first transmission angle offset is one of the multiple transmission angle offsets.

13. The method according to claim 12, characterized in that The first information includes a unit transmission angle offset, where the unit transmission angle offset is a transmission angle offset between adjacent frequency bands.

14. The method according to any one of claims 10 to 13, characterized in that The target device is a device having control rights of the reflection weight of the RIS.

15. The method according to any one of claims 10 to 14, characterized in that The target device is the second device or the RIS.

16. The method according to any one of claims 10 to 15, characterized in that Also includes: The target device sends third information to the first device, where the third information is used to determine a width of the first frequency band.

17. The method according to claim 16, characterized in that The multiple frequency bands are divided into at least two frequency band groups, wherein: The third information is specifically used to indicate the frequency width of the frequency band included in each of the at least two frequency band groups, wherein the at least two frequency band groups include a first frequency band group and a second frequency band group, the frequency width of the frequency band included in the first frequency band group is different from the frequency width of the frequency band included in the second frequency band group, and the first frequency band group includes the first frequency band.

18. The method according to claim 16, characterized in that The third information includes a preset threshold, and the target reflection angle includes a first reflection angle and a second reflection angle, wherein: The beam with the minimum frequency in the first frequency band enters the RIS at the first transmission angle and then exits at the first reflection angle, and the beam with the maximum frequency in the first frequency band enters the RIS at the first transmission angle and then exits at the second reflection angle, and the difference between the first reflection angle and the second reflection angle is less than or equal to the preset threshold.

19. A communication device, characterized in that: comprising a processor configured to, by executing a computer program or instructions, or, by means of a logic circuit, The communication device is caused to execute the method according to any one of claims 1 to 9, or The communication device is enabled to execute the method according to any one of claims 10 to 18.

20. A communication device, characterized in that: include: A processor and a memory, wherein the memory stores a computer program or instructions, and the processor is used to, by executing the computer program or instructions, enable the communication device to perform the method described in any one of claims 1 to 9, or enable the communication device to perform the method described in any one of claims 10 to 18.

21. A computer-readable storage medium, characterized in that: The computer readable storage medium stores a computer program or instruction. When the computer program or instruction is executed on a computer, so that the method according to any one of claims 1 to 9 is performed, or The method according to any one of claims 10 to 18 is performed.

22. A computer program product, characterized in that The method comprises a computer program code, and when the computer program code is executed, the method according to any one of claims 1 to 9 is implemented, or the method according to any one of claims 10 to 18 is implemented.

23. A communication system, characterized in that: include: A first device and a target device, wherein the first device is used to execute the method according to any one of claims 1 to 9, and the target device is used to execute the method according to any one of claims 10 to 18.

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