Communication system and communication method

Abstract

The present invention promotes further utilization of a frequency band. A communication system (1) has a base station (20) and an information processing device (100). The base station (20) has a liquid crystal-type RIS antenna (30) capable of projecting different pieces of information depending on the angle. The information processing device (100) has a control unit (130) that uses the operation history of a terminal device (10) whereby communication is performed with the base station (20) as a basis to determine provision information to be provided to a user using the terminal device (10) and projects the determined provision information onto the liquid crystal-type RIS antenna (30) of the base station at an angle corresponding to the direction of the user.

Description

Communication system and communication method

[0001] The present invention relates to a communication system and a communication method.

[0002] 2. Description of the Related Art Conventionally, communication technologies using millimeter wave bands to terahertz wave bands have been known in communication systems including base stations and terminal devices.

[0003] JP 2023-141844 A

[0004] However, conventional technologies have not been able to promote further utilization of frequency bands.

[0005] The present application has been made in view of the above, and aims to promote further utilization of frequency bands.

[0006] The communication system of the present application includes a base station having an LCD type RIS antenna capable of projecting different information depending on the angle, and an information processing device having a control unit that determines information to be provided to a user using a terminal device that communicates with the base station based on the operation history of the terminal device, and projects the determined information to be provided onto the LCD type RIS antenna of the base station at an angle corresponding to the direction of the user.

[0007] According to one aspect of the embodiment, it is possible to achieve an effect of promoting further utilization of frequency bands.

[0008] FIG. 1 is an explanatory diagram illustrating the difference between a massive MIMO antenna and a liquid crystal type RIS antenna. FIG. 2 is a diagram illustrating an example of the configuration of a communication system according to an embodiment. FIG. 3 is a diagram illustrating a cross-sectional view of a liquid crystal type RIS antenna according to an embodiment. FIG. 4 is a diagram illustrating an example of information processing according to an embodiment. FIG. 5 is a diagram illustrating an example of the configuration of an information processing device according to an embodiment. FIG. 6 is a diagram illustrating an example of an operation history storage unit according to an embodiment. FIG. 7 is a diagram illustrating an example of a provided information storage unit according to an embodiment. FIG. 8 is a diagram illustrating an example of a projection display information storage unit according to an embodiment. FIG. 9 is a flowchart illustrating an example of information processing according to an embodiment. FIG. 10 is a hardware configuration diagram illustrating an example of a computer that realizes the functions of an information processing device.

[0009] Hereinafter, a communication system and a communication method according to the present application (hereinafter referred to as "embodiments") will be described in detail with reference to the drawings. Note that the communication system and the communication method according to the present application are not limited to the embodiments. Furthermore, the same components in the following embodiments are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0010] (Embodiments) [1. Introduction] Communications using the millimeter wave band to terahertz wave band have large propagation losses and are difficult to form coverage areas, so they have beam scanning and high gain functions. Furthermore, communications in these frequency bands require large-scale array antennas and also require small cell configurations. This increases the number of base stations, and the cost of equipment is high, so their use has not progressed. Therefore, it is considered necessary to improve revenue by adding additional functions other than communications applications.

[0011] For example, with the increasing amount of data used by applications, the active use of millimeter wave bands, which have a wide range of available frequency bands, is required for 5G and beyond, and services have actually been launched. On the other hand, as the frequency band becomes higher, propagation loss increases, resulting in a decrease in area coverage. For this reason, the use of massive MIMO antennas with improved gain and beam tracking functions is being promoted. However, massive MIMO antennas use numerous components such as RF (Radio Frequency) components and A / D (Analog-to-Digital) converters, and require power to drive these components. Therefore, they are expensive to manufacture and operate. Therefore, there is a need for antennas with improved gain and beam tracking functions that can be manufactured and operated more inexpensively than massive MIMO antennas.

[0012] In recent years, technology for intelligent radio surfaces (IREs), which attempt to adaptively and dynamically control radio wave (beam) environments, has become increasingly important. One of the technologies essential for realizing IREs is reconfigurable intelligent surfaces (RISs). RISs are composed of numerous elements that scatter beams. RISs also use metasurface technology, which allows for the design and control of the distribution of scattering characteristics over a surface. Metasurfaces can be fabricated in flexible sheet form and can be installed in a shape that conforms to the shape of a structure, allowing for the control of beam scattering characteristics while maintaining the shape of the existing structure.

[0013] Furthermore, by utilizing a technology called "AI-RAN," which combines AI (Artificial Intelligence) and next-generation mobile networks, base stations can cooperate with each other and optimize the entire area, enabling the effective provision of information to users. Utilizing this type of RIC (RAN Intelligent Controller) technology will enable operational optimization.

[0014] The present application has been made in view of the above, and aims to promote further utilization of frequency bands. In the following embodiment, a liquid crystal RIS antenna with a primary radiator consisting of an orthogonally polarized antenna and improved gain and beam scanning functionality is used to significantly reduce components such as RF components and A / D converters. Additionally, to enjoy the benefits of using an LCD, a function is added that enables the projection of different information depending on the angle (e.g., still image or video advertisements). Specifically, AI on the base station side is used to project information suited to the interests and preferences of users located in the beam scanning angle direction. This allows for more cost-effective production and operation than massive MIMO antennas, and also makes it possible to secure revenue from information provision.

[0015] Figure 1 is an explanatory diagram illustrating the differences between a massive MIMO antenna and a liquid crystal RIS antenna. A massive MIMO antenna (left side of Figure 1) uses many components, such as an A / D converter, a phase shifter, and a feeder line. This increases power consumption. Furthermore, calibration of each terminal is required for beam scanning. A liquid crystal RIS antenna (right side of Figure 1) emits a beam from a primary radiator and re-radiates it at a liquid crystal RIS antenna. Furthermore, a liquid crystal RIS antenna reduces power consumption by reducing the number of components, such as an A / D converter. Furthermore, a liquid crystal RIS antenna does not require calibration of each terminal. The beam control unit controls the direction of the beam emitted from the base station. The angle of the beam control unit is fixed in advance, and all beams that hit a specific part of the beam control unit are re-radiated in the same direction. Note that H and V on the right side of Figure 1 represent the polarization of the beam (horizontal H and perpendicular V).

[0016] 2. Configuration of the communication system The communication system 1 shown in Fig. 2 will be described. As shown in Fig. 2, the communication system 1 includes a terminal device 10, a base station 20, and an information processing device 100. The terminal device 10, the base station 20, and the information processing device 100 are connected to each other via a predetermined communication network (network N) so as to be able to communicate with each other via wired or wireless communication. Fig. 2 is a diagram showing an example of the configuration of the communication system 1 according to an embodiment.

[0017] The terminal device 10 is an information processing device used by a user. The user is, for example, the owner of the terminal device 10. The terminal device 10 may be any device that can implement the processes in the embodiment. The terminal device 10 may be, for example, a smartphone, a tablet terminal, a notebook PC, a desktop PC, a mobile phone, a PDA, or other device. FIG. 4 illustrates a case where the terminal device 10 is a smartphone.

[0018] The terminal device 10 is, for example, a smart device such as a smartphone or smart glasses, and is a mobile terminal device that can communicate with any server device via a wireless communication network such as 4G to 5G (Generations) or LTE (Long Term Evolution). The terminal device 10 may have a screen such as a liquid crystal display with touch panel functionality, and may accept various operations on displayed data such as content, such as tapping, sliding, and scrolling, performed by a user's finger or stylus. In FIG. 4, the terminal device 10 is used by users U1 to U4.

[0019] The base station 20 is a base station that emits a beam. The base station 20 has a liquid crystal RIS antenna 30 (see FIG. 3 ) formed from a primary radiator and a liquid crystal display. The liquid crystal RIS antenna 30 is a liquid crystal RIS antenna with additional functions in addition to communication applications, and is capable of projecting different information depending on the angle (i.e., it has a liquid crystal that can project from multiple viewpoints). The liquid crystal RIS antenna 30 is capable of projecting different information depending on the user's beam scanning angle direction. Therefore, by using AI to analyze the operation history (e.g., search history, browsing history, etc.) of terminal devices 10 located in the direction in which the beam is formed, it is possible to project information that is likely to be of interest for each beam direction. This, for example, can address blind spots in communications, promote MIMO efficiency, and enable advertising revenue.

[0020] 3 is a diagram showing a cross-sectional view of a liquid crystal RIS antenna according to an embodiment. The liquid crystal RIS antenna 30 is a liquid crystal RIS antenna in which a transparent RIS consisting of a reflecting element, liquid crystal, and a transparent ground is installed on a display capable of projecting multiple images, which consists of a polarizing plate, a parallax barrier, pixels, glass, and a polarizing plate. By installing a transparent RIS on an existing display, as in the liquid crystal RIS antenna 30, it becomes possible to control the scattering characteristics of the beam while maintaining the shape of the display.

[0021] Many of the antennas currently used in the millimeter wave to terahertz wave bands are large-scale array antennas with a large number of RF ports and analog circuits. Such large-scale array antennas have high power consumption and equipment costs, and tend to easily form blind spots. By using a RIS, such as the liquid crystal RIS antenna 30, the number of parts, such as the number of RF ports, can be reduced, thereby reducing equipment costs. In addition, using it as digital signage can generate advertising revenue.

[0022] The base station 20 estimates the position (and direction) of the terminal device 10 based on the receiving direction of the beam from the terminal device 10. Identification information is assigned to the direction of the beam emitted from the base station 20, and when the terminal device 10 selects a beam, the base station 20 can identify the receiving direction of the beam from the terminal device 10, thereby making it possible to estimate the position (and direction) of the terminal device 10. In this way, the base station 20 estimates the position (and direction) of the terminal device 10 through mutual processing of the beam with the terminal device 10.

[0023] The information processing device 100 is an information processing device intended to promote further utilization of frequency bands, and may be any device capable of implementing the processes described in the embodiments. The information processing device 100 is implemented, for example, by a server device or a cloud system on the base station 20 side. The information processing device 100 determines information to be provided to a user based on, for example, a user's operation history in the beam scanning angle direction, and projects the information to be provided onto the liquid crystal RIS antenna 30 at an angle corresponding to the user's direction.

[0024] Although FIG. 1 shows a case where the base station 20 and the information processing device 100 are separate devices, the base station 20 and the information processing device 100 may be integrated.

[0025] 4 is a diagram illustrating an example of information processing in the communication system 1 according to the embodiment. The base station 20 estimates the position (and direction) of the user U1 by identifying the receiving direction of the beam of the terminal device 10 through mutual processing of the beam with the terminal device 10 of the user U1 (step S101).

[0026] When the base station 20 identifies the user U1 as the user in the beam scanning angle direction, the base station 20 transmits information indicating that the user U1 has been identified (for example, user identification information) to the information processing device 100 (step S102).

[0027] The information processing device 100 acquires the operation history of the user U1 based on the information from the base station 20, and determines information to be provided to the user U1 that is suited to the user U1's hobbies and preferences (step S103). At this time, for example, the information processing device 100 determines the information to be provided using conventional technology (such as "AI-RAN").

[0028] The information processing device 100 projects information at an angle corresponding to the direction of the user U1 onto the liquid crystal RIS antenna 30. For example, the information processing device 100 simultaneously projects different information onto the liquid crystal RIS antenna 30 for each beam scanning angle direction.

[0029] As shown in the example of FIG. 4, the terminal device 10 of the user U1 (terminal device 10 １ ) receives a beam in beam direction #1, the information processing device 100 performs control to enable information suited to the hobbies and preferences of user U1 to be viewed from the direction of beam direction #1. For example, the information processing device 100 projects information suited to the hobbies and preferences of user U1 onto the liquid crystal type RIS antenna 30 so that it is displayed in the direction of beam direction #1. In FIG. 4, an advertisement relating to rental property can be viewed from the direction of beam direction #1 as an example of information suited to the hobbies and preferences of user U1. Also, the terminal device 10 of user U4 (terminal device 10 ４When user U1 receives a beam in beam direction #4, the information processing device 100 performs control to enable user U4 to view information suited to the hobbies and preferences of user U4 from the direction of beam direction #4. For example, the information processing device 100 projects information suited to user U4's hobbies and preferences onto the liquid crystal RIS antenna 30 so that it is displayed in the direction of beam direction #4. In FIG. 4 , a car-related advertisement, as an example of information suited to user U4's hobbies and preferences, is viewable from the direction of beam direction #4. In FIG. 4 , rental-related advertisements and car-related advertisements are viewable simultaneously in the directions of beam direction #1 and beam direction #4. This allows user U4 to view a car-related advertisement on the same display at the same time that user U1 views a rental-related advertisement.

[0030] 4, the angle of the liquid crystal type RIS antenna 30 is fixed, and by storing information such as that when projected onto a predetermined portion (referred to as portion A) of the liquid crystal type RIS antenna 30, an image is displayed in a predetermined direction (referred to as portion X), and when projected onto a predetermined portion (referred to as portion B) of the liquid crystal type RIS antenna 30, an image is displayed in a predetermined direction (referred to as portion Y), projecting provided information (referred to as portion Z information) onto portion A makes it possible to view the Z information from the X direction, and projecting provided information (referred to as portion W information) onto portion B makes it possible to view the W information from the Y direction. The information processing device 100 acquires position information (and direction information) of the terminal device 10 based on the beam receiving direction from the base station 20, and, based on stored information on the predetermined direction in which the provided information can be viewed when projected onto the predetermined portion, projects the provided information onto the predetermined portion of the liquid crystal type RIS antenna 30 so that the provided information can be viewed from the position of the acquired position information.

[0031] 4. Configuration of Information Processing Device Next, the configuration of the information processing device 100 according to the embodiment will be described with reference to Fig. 5. Fig. 5 is a diagram showing an example of the configuration of the information processing device 100 according to the embodiment. As shown in Fig. 5, the information processing device 100 has a communication unit 110, a storage unit 120, and a control unit 130. Note that the information processing device 100 may also have an input unit (e.g., a keyboard, a mouse, etc.) that accepts various operations from an administrator of the information processing device 100, and a display unit (e.g., a liquid crystal display, etc.) that displays various information.

[0032] (Communication Unit 110) The communication unit 110 is realized by, for example, a network interface card (NIC), etc. The communication unit 110 is connected to the network N by wire or wirelessly, and transmits and receives information to and from the base station 20, etc. via the network N.

[0033] (Storage Unit 120) The storage unit 120 is realized by, for example, a semiconductor memory element such as a RAM (Random Access Memory) or a flash memory, or a storage device such as a hard disk or an optical disk. As shown in Fig. 5 , the storage unit 120 has an operation history storage unit 121, a provided information storage unit 122, and a projection display information storage unit 123.

[0034] The operation history storage unit 121 stores a user's operation history (for example, a search history, a browsing history, etc.). Fig. 6 shows an example of the operation history storage unit 121 according to the embodiment. As shown in Fig. 6, the operation history storage unit 121 has items such as "user ID," "attributes," and "operation history."

[0035] "User ID" indicates identification information for identifying a user. "Attribute" indicates the attributes of a user (for example, age, gender, etc.). "Operation history" indicates the operation history. In the example shown in FIG. 6, conceptual information such as "Operation history #1" and "Operation history #2" is stored in "Operation history", but in reality, information such as the time and number of operation actions is stored.

[0036] The provided information storage unit 122 stores provided information (for example, advertisements of still images or moving images). Fig. 7 shows an example of the provided information storage unit 122 according to the embodiment. As shown in Fig. 7, the provided information storage unit 122 has items such as "provided information ID," "type," "target attribute," and "provided information."

[0037] "Provided Information ID" indicates identification information for identifying the provided information. "Type" indicates the type of provided information (e.g., news, sports, etc.). "Target Attribute" indicates the user attribute targeted by the provided information (e.g., men in their 20s, etc.). "Provided Information" indicates the provided information. In the example shown in Figure 7, conceptual information such as "Provided Information #1" and "Provided Information #2" is stored in "Provided Information," but in reality, text of content included in the provided information is stored. Image data of the content may also be stored. For example, a uniform resource locator (URL) where the image data is located, a file path name indicating the storage location, etc. may be stored.

[0038] The projection display information storage unit 123 stores a predetermined direction in which the provided information can be viewed when projected onto a predetermined portion of the liquid crystal type RIS antenna 30. Fig. 8 shows an example of the projection display information storage unit 123 according to the embodiment. As shown in Fig. 8, the projection display information storage unit 123 has items such as "liquid crystal type RIS antenna ID," "projection portion," and "display direction."

[0039] "Liquid crystal type RIS antenna ID" indicates identification information for identifying the liquid crystal type RIS antenna. "Projection portion" indicates a predetermined portion of the liquid crystal type RIS antenna 30 (may be a portion at angle XX). "Display direction" indicates a predetermined direction (may be a direction at angle XX) in which the provided information can be viewed.

[0040] (Control Unit 130) The control unit 130 is a controller, and is realized by a CPU (Central Processing Unit), an MPU (Micro Processing Unit), or the like, using RAM as a work area to execute various programs stored in a storage device inside the information processing device 100. The control unit 130 is also realized by an integrated circuit, such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0041] 5, the control unit 130 has an acquisition unit 131, a determination unit 132, and a projection unit 133, and realizes or executes the information processing functions described below. Note that the internal configuration of the control unit 130 is not limited to the configuration shown in FIG. 5, and other configurations may be used as long as they perform the information processing described below.

[0042] (Acquisition Unit 131) The acquisition unit 131 acquires various pieces of information. The acquisition unit 131 acquires various pieces of information from an external information processing device. For example, the acquisition unit 131 acquires various pieces of information from another information processing device such as the base station 20.

[0043] The acquisition unit 131 acquires various pieces of information from the storage unit 120. The acquisition unit 131 also stores the acquired various pieces of information in the storage unit 120.

[0044] The acquisition unit 131 acquires, for example, information that a user in the beam scanning angle direction has been identified, transmitted from the base station 20. For example, the acquisition unit 131 acquires identification information of the user (or identification information of the terminal device 10) identified by the base station 20 as a user in the beam scanning angle direction. Furthermore, the acquisition unit 131 acquires, for example, an operation history of the user (or an operation history of the terminal device 10) identified by the base station 20 as a user in the beam scanning angle direction.

[0045] The acquisition unit 131 acquires, for example, the position information of the terminal device 10 based on the receiving direction of a beam from the base station 20. For example, the acquisition unit 131 acquires the position information of the terminal device 10 transmitted from the base station 20.

[0046] (Determination unit 132) The determination unit 132 determines information to be provided to the user, for example, based on the operation history of the user acquired by the acquisition unit 131. For example, the determination unit 132 determines information to be provided based on the operation history of the terminal device 10, the position of which has been estimated based on the receiving direction of a beam from the base station 20. Furthermore, for example, the determination unit 132 determines information to be provided to the user by selecting information to be provided that is suited to the user's interests and preferences from among predetermined options of information to be provided.

[0047] The determination unit 132 determines information to be provided to a user by using, for example, a learning model. For example, the determination unit 132 determines information to be provided to a user by using a learning model that can predict information to be provided that suits a user's hobbies and preferences from the user's operation history. For example, the determination unit 132 determines information to be provided to a user by using a learning model that has learned conversion results for the information to be provided to a user (for example, whether or not a product or the like indicated in the information to be provided was purchased, whether or not an online shopping mall or the like for the product or the like indicated in the information to be provided was accessed, etc.).

[0048] (Projection unit 133) For example, the projection unit 133 projects the information to be provided determined by the determination unit 132 onto the liquid crystal RIS antenna 30 at an angle corresponding to the direction of the user. For example, the projection unit 133 projects the information to be provided based on the location information of the terminal device 10 acquired by the acquisition unit 131 at an angle corresponding to the direction corresponding to the location information.

[0049] The projection unit 133 projects the provided information so that the provided information can be viewed from the direction of the user in the beam scanning angle direction, for example. For example, the projection unit 133 projects the provided information so that different provided information can be viewed for each beam scanning angle direction. For example, the projection unit 133 projects the provided information based on stored information about a predetermined direction in which the provided information can be viewed when projected onto a predetermined part of the liquid crystal RIS antenna 30 (for example, stored information that indicates that when projected onto part A of the liquid crystal RIS antenna 30, an image is displayed in the X direction, and when projected onto part B of the liquid crystal RIS antenna 30, an image is displayed in the Y direction).

[0050] 5. Information Processing Flow Next, the procedure of information processing by the communication system 1 according to the embodiment will be described with reference to FIG.

[0051] 9 , the communication system 1 estimates the user's position (and direction) based on the receiving direction of a beam from the base station 20 (step S201). The communication system 1 also determines information to be provided to the user based on the user's operation history (step S202). The communication system 1 also projects the information to be provided at an angle corresponding to the user's direction so that the information can be viewed from the user's direction (step S203).

[0052] 6. Effects As described above, the communication system 1 according to the embodiment includes the base station 20 and the information processing device 100. The base station 20 includes a liquid crystal RIS antenna 30 capable of projecting different information depending on the angle. The information processing device 100 includes a control unit 130 that determines information to be provided to a user of the terminal device 10, which communicates with the base station 20, based on the operation history of the terminal device 10, and projects the determined information to be provided onto the liquid crystal RIS antenna 30 of the base station 20 at an angle corresponding to the direction of the user.

[0053] As a result, the communication system 1 according to the embodiment can display advertisements and other information tailored to the user's preferences in the direction of the user through communication between the terminal device 10 and the base station 20, thereby eliminating communication blind spots and promoting MIMO efficiency. Furthermore, the communication system 1 according to the embodiment can display advertisements and other information on a display using the liquid crystal RIS antenna 30, thereby enabling monetization through advertising distribution and other means. Furthermore, the communication system 1 according to the embodiment can reduce the number of components compared to conventional technologies, thereby enabling inexpensive production and operation. Furthermore, it can also reduce power consumption. Furthermore, it can eliminate the need for calibration for each terminal. As a result, the communication system 1 according to the embodiment can promote further utilization of frequency bands. Furthermore, the communication system 1 according to the embodiment can promote further utilization of frequency bands, thereby contributing to the achievement of Goal 9 of the Sustainable Development Goals (SDGs), "Build resilient infrastructure, promote inclusive and sustainable industrialization, and build resilient infrastructure."

[0054] Furthermore, the control unit 130 projects the provided information based on stored information about a predetermined direction in which the provided information can be viewed when projected onto a predetermined portion of the liquid crystal type RIS antenna 30 .

[0055] As a result, the communication system 1 according to the embodiment can project advertisements and the like onto a predetermined portion of the liquid crystal type RIS antenna 30, thereby appropriately displaying advertisements and the like in the direction of the user.

[0056] Furthermore, the control unit 130 projects the provided information onto a predetermined portion of the liquid crystal type RIS antenna 30 so that the provided information can be viewed from the direction of the user.

[0057] As a result, the communication system 1 according to the embodiment can project advertisements and the like onto a predetermined portion of the liquid crystal type RIS antenna 30, thereby appropriately displaying advertisements and the like in the direction of the user.

[0058] Furthermore, based on the location information of the terminal device 10 transmitted from the base station 20, the control unit 130 projects the provided information at an angle corresponding to the direction corresponding to the location information.

[0059] As a result, the communication system 1 according to the embodiment can accurately grasp the location of the user, and can appropriately display advertisements and the like in the direction of the user.

[0060] Furthermore, the control unit 130 determines the information to be provided based on the operation history of the terminal device 10 whose position has been estimated based on the receiving direction of the beam from the base station 20 .

[0061] As a result, the communication system 1 according to the embodiment can accurately grasp the location of the user, and can appropriately display advertisements and the like in the direction of the user.

[0062] Furthermore, the control unit 130 determines the information to be provided using a learning model that can predict information to be provided that is suited to the user's interests and preferences from the user's operation history.

[0063] This allows the communication system 1 according to the embodiment to display advertisements and the like that are more suited to the user's hobbies and preferences.

[0064] The provided information is an advertisement. Thus, the communication system 1 according to the embodiment can display advertisements suited to the user's interests and preferences toward the user through communication between the terminal device 10 and the base station 20.

[0065] 7. Hardware Configuration The information processing device 100 according to the embodiment described above is realized by a computer 1000 having a configuration as shown in Fig. 10. Fig. 10 is a hardware configuration diagram showing an example of a computer that realizes the functions of the information processing device 100. The computer 1000 includes a CPU 1100, a RAM 1200, a ROM 1300, a HDD 1400, a communication interface (I / F) 1500, an input / output interface (I / F) 1600, and a media interface (I / F) 1700.

[0066] The CPU 1100 operates and controls each unit based on programs stored in the ROM 1300 or the HDD 1400. The ROM 1300 stores a boot program executed by the CPU 1100 when the computer 1000 starts up, programs that depend on the hardware of the computer 1000, and the like.

[0067] The HDD 1400 stores programs executed by the CPU 1100 and data used by such programs. The communication interface 1500 receives data from other devices via a predetermined communication network and sends it to the CPU 1100, and transmits data generated by the CPU 1100 to other devices via the predetermined communication network.

[0068] The CPU 1100 controls output devices such as a display and a printer, and input devices such as a keyboard and a mouse, via the input / output interface 1600. The CPU 1100 acquires data from the input devices via the input / output interface 1600. The CPU 1100 also outputs generated data to the output devices via the input / output interface 1600.

[0069] Media interface 1700 reads a program or data stored in recording medium 1800 and provides it to CPU 1100 via RAM 1200. CPU 1100 loads the program or data from recording medium 1800 onto RAM 1200 via media interface 1700 and executes the loaded program. Recording medium 1800 is, for example, an optical recording medium such as a DVD (Digital Versatile Disc) or a PD (Phase Change Rewritable Disc), a magneto-optical recording medium such as an MO (Magneto-Optical disk), a tape medium, a magnetic recording medium, or a semiconductor memory.

[0070] For example, when the computer 1000 functions as the information processing device 100 according to the embodiment, the CPU 1100 of the computer 1000 executes programs loaded onto the RAM 1200 to realize the functions of the control unit 130. The CPU 1100 of the computer 1000 reads and executes these programs from the recording medium 1800, but as another example, the CPU 1100 may obtain these programs from another device via a predetermined communication network.

[0071] Although some of the embodiments of the present application have been described in detail above with reference to the drawings, these are merely examples, and the present invention can be implemented in other forms that include the embodiments described in the Disclosure of the Invention section and that have undergone various modifications and improvements based on the knowledge of those skilled in the art.

[0072] [8. Other] Furthermore, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or all or part of the processes described as being performed manually can be performed automatically using known methods. In addition, the information including the processing procedures, specific names, various data, and parameters shown in the above documents and drawings can be changed as desired unless otherwise specified. For example, the various information shown in each drawing is not limited to the information shown in the drawings.

[0073] Furthermore, the components of each device shown in the figure are conceptual functional components and do not necessarily have to be physically configured as shown in the figure. In other words, the specific form of distribution and integration of each device is not limited to that shown in the figure, and all or part of them can be functionally or physically distributed and integrated in any unit depending on various loads, usage conditions, etc.

[0074] Furthermore, the information processing device 100 described above may be realized using multiple server computers, and depending on the function, the configuration can be flexibly changed, such as by calling an external platform using an API (Application Programming Interface) or network computing.

[0075] Furthermore, the above-described embodiments can be combined as appropriate within the scope of not causing any contradiction in the processing content.

[0076] REFERENCE SIGNS LIST 1 Communication system 10 Terminal device 20 Base station 30 Liquid crystal type RIS antenna 100 Information processing device 110 Communication unit 120 Storage unit 121 Operation history storage unit 122 Provided information storage unit 123 Projection display information storage unit 130 Control unit 131 Acquisition unit 132 Decision unit 133 Projection unit N Network

Claims

1. A communications system having a base station and an information processing device, wherein the base station has a liquid crystal type RIS antenna capable of projecting different information depending on the angle, and the information processing device has a control unit that determines information to be provided to a user of a terminal device that communicates with the base station based on the operation history of the terminal device, and projects the determined information to be provided onto the liquid crystal type RIS antenna of the base station at an angle corresponding to the direction of the user.

2. The communication system according to claim 1, wherein the control unit projects the provided information based on stored information about a predetermined direction in which the provided information can be viewed when projected onto a predetermined part of the liquid crystal type RIS antenna.

3. The communication system according to claim 1, wherein the control unit projects the provided information onto a predetermined portion of the liquid crystal type RIS antenna so that the provided information can be viewed from the direction of the user.

4. The communication system according to claim 1, wherein the control unit projects the provided information at an angle corresponding to a direction corresponding to the location information of the terminal device transmitted from the base station.

5. The communication system according to claim 1, wherein the control unit determines the information to be provided based on the operation history of the terminal device whose position is estimated based on the receiving direction of the beam from the base station.

6. The communication system according to claim 1, wherein the control unit determines the information to be provided using a learning model that can predict information to be provided that is suitable for the user's hobbies and preferences from the user's operation history.

7. The communication system according to claim 1, wherein the provided information is an advertisement.

8. A communication method implemented by a communication system having a base station and an information processing device, wherein the base station has a liquid crystal type RIS antenna capable of projecting different information depending on the angle, and the information processing device determines information to be provided to a user using a terminal device that communicates with the base station based on the operation history of the terminal device, and projects the determined information onto the liquid crystal type RIS antenna of the base station at an angle corresponding to the direction of the user.

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