First base station device, second base station device, reflection control method, and wireless communication system

Abstract

Provided is a first base station device in a wireless communication system comprising the first base station device, which wirelessly connects to a first terminal device, and a second base station device that can wirelessly connect to the first terminal device via a reflection device, the reflection device being controlled by the second base station device, reflecting radio waves transmitted by the second base station device, and transmitting a reflected wave. The first base station device comprises: a reception unit that receives, from the first terminal device, a measurement result of the wireless quality of the reflected wave measured by the first terminal device, and control information of the reflected wave included in the reflected wave; and a control unit that transmits the control information to the second base station device when the first terminal device is handed over to the second base station device.

Description

[Technical Field]

[0001] The present invention relates to a first base station device, a second base station device, a reflection control method, and a wireless communication system. [Background technology]

[0002] 2. Description of the Related Art In recent years, wireless communication systems have come into use. In wireless communication systems, wireless communication is achieved by transmitting and receiving radio waves between a base station device and a terminal device, for example.

[0003] When a base station device has an obstruction such as a building within its communication area, the base station device may not be able to transmit radio waves to a terminal device located within the communication area. In this case, the terminal device may not be able to wirelessly connect to the base station device even if it is within the communication area of ​​the base station device. There is a technology that uses a reflector to reflect radio waves to areas within such communication areas where the radio waves cannot reach.

[0004] Techniques relating to radio wave reflectors are described in the following prior art documents. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2020 / 189453 [Patent Document 2] Special Publication No. 2016-536931 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the waves reflected by the reflector may be controlled to track a specific terminal device, for example. In this case, even if another terminal device receives the reflected waves and attempts to wirelessly connect to the base station device that reflected the waves, the specific terminal device may move and be unable to receive the reflected waves, which may result in a failure of the wireless connection.

[0007] Therefore, one disclosure provides a first base station device, a second base station device, a reflection control method, and a wireless communication system that suppress failures of wireless connection with the base station device that is the source of the reflected wave in a communication system that uses reflected waves from a reflector. [Means for solving the problem]

[0008] The first base station device of a wireless communication system has a first base station device that is wirelessly connected to a first terminal device, and a second base station device that can be wirelessly connected to the first terminal device via a reflecting device, where the reflecting device is controlled by the second base station device, reflects radio waves transmitted by the second base station device, and transmits reflected waves.The first base station device has a receiving unit that receives from the first terminal device a measurement result of the wireless quality of the reflected wave measured by the first terminal device and control information of the reflected wave contained in the reflected wave, and a control unit that transmits the control information to the second base station device when the first terminal device hands over to the second base station device. [Effects of the Invention]

[0009] The present disclosure makes it possible to suppress failure of wireless connection with a base station device that is a source of the reflected wave in a communication system that uses a wave reflected by a reflector. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a wireless communication system 10. As shown in FIG. [Figure 2] FIG. 2 illustrates an example of the configuration of the base station device 200. As shown in FIG. [Figure 3] FIG. 3 is a diagram illustrating an example of the configuration of the terminal device 100. As shown in FIG. [Figure 4] FIG. 4 is a diagram illustrating an example of the configuration of the reflecting device 300. As shown in FIG. [Figure 5] FIG. 5 is a diagram showing an example of a process in which the terminal device 100-2 performs a handover to the base station device 200-1. [Figure 6]FIG. 6 is a diagram showing an example of a sequence in which the terminal device 100-2 performs a handover to the base station device 200-1. [Figure 7] FIG. 7 is a diagram showing an example of a reflected wave when reflection control is executed for the terminal device 100-2. [Figure 8] FIG. 8 is a diagram showing an example of the configuration of the wireless communication system 10. As shown in FIG. [Figure 9] FIG. 9 is a diagram showing an example of a sequence in which the terminal device 100-2 performs a handover to the base station device 200-1. DETAILED DESCRIPTION OF THE INVENTION

[0011] [First embodiment] A first embodiment will be described. Fig. 1 is a diagram showing an example of the configuration of a wireless communication system 10. The wireless communication system 10 includes a reflecting device 300, terminal devices 100-1 and 100-2, and base station devices 200-1 and 200-2. In the wireless communication system 10, a shielding object 400 exists within the communication area of ​​the base station device 200-1.

[0012] Base station devices 200-1 and 200-2 (hereinafter sometimes referred to as base station device 200) each have a communication area. Base station device 200 wirelessly connects to and communicates with terminal devices 100-1 and 100-2 within the communication area. Base station device 200 also has a directional antenna, and can control the transmission direction of radio waves by changing the multi-level modulation method or using the directional antenna.

[0013] The terminal devices 100-1 and 100-2 (hereinafter sometimes referred to as terminal devices 100) are communication devices that are wirelessly connected to the base station device 200 and perform wireless communication with other terminal devices, such as smartphones and tablet terminals.

[0014] The reflection device 300 is a device that reflects radio waves transmitted by the base station device 200 and the terminal device 100 and transmits reflected waves. The reflection device 300 reflects the received radio waves under the control of the base station device 200. The reflected waves include, for example, broadcast information transmitted by the base station device 200. The reflected waves also include communication or control signals transmitted and received in wireless communication between the base station device 200 and the terminal device 100.

[0015] The reflecting device 300 is, for example, a RIS (Reconfigurable Intelligent Surface). The RIS is a reflecting plate that uses a metasurface. A metasurface is a material that realizes electromagnetic properties (dielectric constant, magnetic permeability, etc.) that do not exist in nature by arranging structures smaller than the wavelength of radio waves on a reflecting device, likening them to atoms or molecules. By using a metasurface, the RIS can reflect each of multiple radio waves in a desired direction. Furthermore, the RIS can manipulate information contained in the reflected waves, for example, and can add or update specified information.

[0016] The shielding object 400 is an object that blocks radio waves. Due to the presence of the shielding object 400, the base station device 200 cannot transmit or receive radio waves directly (without going through the reflecting device 300) to or from the terminal device 100 located in a specific area (a non-communicable area). In order to complement wireless communication with the terminal device 100 located in the non-communicable area, the base station device 200 uses the reflecting device 300 to transmit reflected waves to the non-communicable area.

[0017] 1, the terminal device 100-1 is located in an area where direct wireless connection with the base station device 200-1 is not possible. The terminal device 100-1 establishes a wireless connection with the base station device 200-1 using a reflected wave W1 reflected by the reflecting device 300. Thereafter, the reflecting device 300, for example, under the control (in accordance with an instruction) of the base station device 200-1, adjusts the reflection angle (transmission angle) of the reflected wave as the terminal device 100-1 moves, and tracks the terminal device 100-1.

[0018] In the wireless communication system 10, for example, the terminal device 100-2 receives a reflected wave reflected for the terminal device 100-1 and measures wireless quality (received power, noise, etc.). If the wireless quality satisfies the conditions for wireless connection at the time of handover or communication start, the terminal device 100-2 may attempt to wirelessly connect to the base station device 200-1 that is the sender of the reflected wave. In anticipation of such a case, the base station device 200-2 transmits information regarding the reflected wave received by the terminal device 100-2 to the base station device 200-1, and controls the reflection device 300 prior to handover processing or wireless connection processing. In this way, the wireless communication system 10 can suppress failure of the wireless connection or handover of the terminal device 100-2.

[0019] 1, there are two base station devices 200, but there may be three or more. Also, there are two terminal devices 100 in FIG. 1, but there may be one or three or more.

[0020] <Configuration Example of Base Station Device 200> 2 is a diagram illustrating an example of the configuration of the base station device 200. The base station device 200 includes a CPU (Central Processing Unit) 210, a storage 220, a memory 230, a communication circuit 240, a wireless communication circuit 250, and an antenna 251.

[0021] The storage 220 is an auxiliary storage device such as a flash memory, a hard disk drive (HDD), or a solid state drive (SSD) that stores programs and data. The storage 220 stores a wireless communication program 221, a reflection device control program 222, and a handover execution program 223.

[0022] The memory 230 is an area into which the programs stored in the storage 220 are loaded. The memory 230 may also be used as an area in which the programs store data.

[0023] The communication circuit 240 is a device that communicates with other base station devices 200 and the reflection device 300. The communication circuit 240 may be, for example, a wired communication circuit such as an NI (Network Interface), or may be a communication circuit that supports wireless connection.

[0024] The wireless communication circuit 250 is a device that performs wireless communication with the terminal device 100. The wireless communication circuit 250 is wirelessly connected to the terminal device 100 directly or via the reflecting device 300 to achieve wireless communication. The wireless communication circuit 250 has an antenna 251. The antenna 251 includes, for example, a directional antenna that can control the direction of transmission and reception of radio waves.

[0025] The CPU 210 is a processor that loads a program stored in the storage 220 into the memory 230, executes the loaded program, configures each unit, and realizes each process.

[0026] The CPU 210 performs wireless communication processing by executing the wireless communication program 221. The wireless communication processing is processing for establishing a wireless connection with the terminal device 100 and realizing communication performed by the terminal device 100.

[0027] The CPU 210 executes the reflection device control program 222 to configure a control unit, a second control unit, and a reflection control unit, and performs reflection device control processing. The reflection device control processing is processing that causes the reflection device 300 to perform reflection control. The base station device 200 instructs the reflection device 300 to transmit a reflected wave to a specific terminal device 100. The base station device 200 also instructs the reflection device 300 on the reflection angle of the reflected wave, transmission output, information to be assigned to the reflected wave, etc.

[0028] The CPU 210 executes the handover execution program 223 to configure a receiving unit, a second receiving unit, a request receiving unit, a control unit, a second control unit, and a reflection control unit, and to perform handover execution processing. The handover execution processing is processing to execute handover of the terminal device 100. The handover processing includes reflected wave handover processing for the terminal device 100 that has received a reflected wave, and handover processing for the terminal device 100 that has received a normal radio wave other than a reflected wave.

[0029] The CPU 210 executes the reflected wave handover module 2231 included in the handover execution program 223 to configure a receiving unit, a second receiving unit, a request receiving unit, a control unit, a second control unit, and a reflection control unit, and performs reflected wave handover processing. The reflected wave handover processing is processing to execute handover of the terminal device 100 that has received a reflected wave. In the reflected wave handover processing, the base station device 200 transmits reflection control information received from the terminal device 100 to the base station device 200 that is the handover destination.

[0030] The reflected wave handover process also includes processing performed when a handover request including reflection control information is received. When the base station device 200 permits the handover, the base station device 200 generates reflection control information for the terminal device 100 that will perform the handover based on the received reflection control information, and performs reflection control of the reflection device 300 using the reflection control information.

[0031] The CPU 210 executes the handover module 2232 included in the handover execution program 223 to configure a receiving unit, a second receiving unit, and a request receiving unit, and to perform handover processing. The handover processing is processing to execute handover of the terminal device 100 that has received a normal radio wave, not a reflected wave.

[0032] <Configuration example of terminal device 100> 3 is a diagram illustrating an example of the configuration of the terminal device 100. The terminal device 100 includes a CPU 110, a storage 120, a memory 130, a wireless communication circuit 150, and an antenna 151.

[0033] The storage 120 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 120 stores a terminal wireless communication program 121, a radio wave measurement program 122, and a terminal handover execution program 123.

[0034] The memory 130 is an area into which the programs stored in the storage 120 are loaded. The memory 130 may also be used as an area in which the programs store data.

[0035] The wireless communication circuit 150 is a device that performs wireless communication with the base station device 200. The wireless communication circuit 150 wirelessly connects to the base station device 200 directly or via the reflecting device 300 to achieve wireless communication. The wireless communication circuit 150 has an antenna 151. The antenna 151 includes, for example, a directional antenna that can control the direction of transmission and reception of radio waves.

[0036] The CPU 110 is a processor that loads a program stored in the storage 120 into the memory 130, executes the loaded program, configures each unit, and realizes each process.

[0037] The CPU 110 performs terminal wireless communication processing by executing the terminal wireless communication program 121. The terminal wireless communication processing is processing for wirelessly connecting to the base station device 200 and realizing wireless communication with other terminal devices 100 and the base station device 200.

[0038] The CPU 110 executes the radio wave measurement program 122 to construct a measurement unit and perform radio wave measurement processing. The radio wave measurement processing is processing for measuring radio waves that can be received by the terminal device 100 in response to a request from the base station device 200 or periodically. In the radio wave measurement processing, the terminal device 100 measures the wireless quality (received power, frequency band, noise, etc.) of the received radio waves and reports the results to the base station device 200.

[0039] The CPU 110 executes the terminal handover execution program 123 to perform terminal handover execution processing. The terminal handover execution processing is processing for receiving a handover permission from the base station device 200 and executing a handover to the destination base station device 200. The terminal handover processing includes terminal reflected wave handover processing for performing a handover to the base station device 200 that transmitted the reflected wave using a reflected wave, and terminal handover processing for performing a handover using normal radio waves other than the reflected wave.

[0040] The CPU 110 performs a terminal reflected wave handover process by executing a terminal reflected wave handover module 1231 included in the terminal handover execution program 123. The terminal reflected wave handover process is a process of using a received reflected wave to perform a handover to the base station device 200 that is the source of the reflected wave.

[0041] The CPU 110 performs terminal handover processing by executing the terminal handover module 1232 included in the terminal handover execution program 123. The terminal handover processing is processing for executing handover using normal radio waves that are not reflected waves. The terminal handover processing may also be processing in which the terminal device 100 executes normal handover without distinguishing whether the waves are reflected waves or not.

[0042] <Configuration example of reflection device 300> 4 is a diagram illustrating an example of the configuration of the reflecting device 300. The reflecting device 300 includes a CPU 310, a storage 320, a memory 330, a communication circuit 340, and a reflecting structure 370.

[0043] The storage 320 is an auxiliary storage device such as a flash memory, HDD, or SSD that stores programs and data. The storage 320 stores a reflex control program 321.

[0044] The memory 330 is an area into which the programs stored in the storage 320 are loaded. The memory 330 may also be used as an area in which the programs store data.

[0045] The communication circuit 340 is a device that communicates with the base station device 200. The communication circuit 340 may be, for example, a wired communication circuit such as an NI, or may be a communication circuit that supports wireless connection.

[0046] The reflecting structure 370 is an assembly of multiple structures that receive radio waves transmitted by the base station device 200 and the terminal device 100 and transmit them at a desired angle. The reflecting structure 370 is capable of receiving and transmitting (reflecting) radio waves on a structure-by-structure basis.

[0047] The CPU 310 is a processor that loads a program stored in the storage 320 into the memory 330, executes the loaded program, configures each unit, and realizes each process.

[0048] The CPU 310 executes the reflection control program 321 to perform reflection control processing. The reflection control processing is processing for controlling the reflection of received radio waves. In the reflection control processing, the reflection device 300 performs reflection control in accordance with instructions from the base station device 200. The reflection device 300 also performs reflection control so as to track a specified terminal device 100. The reflection device 300 also performs reflection control so that the reflected wave reaches a specific area (for example, an area where radio waves from the base station device 200 do not reach). The reflection device 300 can also adjust the angle, frequency, beam width, etc. of the reflected wave. Furthermore, the reflection device 300 may be able to include predetermined information in the reflected wave or change (update) some of the information.

[0049] <Wireless connection processing using reflected waves> The wireless connection process using reflected waves will be described.

[0050] 5 is a diagram showing an example of processing in which the terminal device 100-2 performs handover to the base station device 200-1. In FIG. 5, the terminal device 100-2 is wirelessly connected to the base station device 200-2 and is performing wireless communication.

[0051] The terminal device 100-2 receives the reflected wave W1 transmitted to the terminal device 100-1 and determines that the reflected wave W1 satisfies the conditions for handover.

[0052] Meanwhile, the terminal device 100-1 is in a wireless connection with the base station device 200-1. The reflection device 300 is controlled to track the movement of the terminal device 100-1 and transmit a reflected wave in accordance with instructions from the base station device 200-1.

[0053] Therefore, when the terminal device 100-1 moves in the direction of the arrow D1, for example, the reflected wave W1 also moves in the direction of the arrow D1. At this time, if the terminal device 100-2 moves in the direction of the arrow D2, it will move away from the reflected wave W1, and there is a possibility that handover using the reflected wave W1 will fail.

[0054] Therefore, in the wireless communication system 10, the base station device 200-1 controls the reflection device 300 prior to the handover process of the terminal device 100-2, and suppresses the failure of the handover of the terminal device 100-2.

[0055] 6 is a diagram showing an example of a sequence in which terminal device 100-2 hands over to base station device 200-1. In the following diagrams, terminal 100-1 corresponds to terminal device 100-1, terminal 100-2 corresponds to terminal device 100-2, base station 200-1 corresponds to base station device 200-1, and base station 200-2 corresponds to base station device 200-2.

[0056] The terminal device 100-1 is in a connected state in which it is wirelessly connected to the base station device 200-1 (S100). The terminal device 100-1 is connected to the base station device 200-1 via the reflector device 300.

[0057] The reflection device 300 is currently performing reflection control on the terminal device 100-1 (S101). The reflection control is, for example, control for adjusting the reflection angle of the reflected wave in accordance with (tracking) the movement of the terminal device 100-1.

[0058] On the other hand, the terminal device 100-2 is in a connected state in which it is wirelessly connected to the base station device 200-2 (S102).

[0059] The terminal device 100-2 performs radio measurement (S103). The terminal device 100-2 performs radio measurement to measure the quality (received power, noise, etc.) of radio waves transmitted by the surrounding base station devices 200 periodically or irregularly.

[0060] The terminal device 100-2 detects radio waves transmitted by the base station device 200-1 in radio measurement (S104). The radio waves from the base station device 200-1 detected by the terminal device 100-2 are reflected waves corresponding to the terminal device 100-1 by the reflection device 300. The reflected waves corresponding to the terminal device 100-1 are, for example, radio waves transmitted by the terminal device 100-1 to transmit a signal used for wireless communication. Hereinafter, the reflected waves corresponding to the terminal device 100-1 may be referred to as the reflected waves for the terminal device 100-1.

[0061] The reflected wave includes, for example, reflection control information (control information). The reflection control information is information that indicates that it is a reflected wave. The reflection control information includes, for example, an identifier (identification information) of the terminal device 100 being tracked. Since the reflection control information includes the identifier of the terminal device, it is possible to determine which terminal device 100 the reflected wave is being transmitted to use for communication.

[0062] The reflection control information may also include a flag indicating that the reflection is via the reflecting device 300. The reflection control information may also include information related to the reflection at the reflecting device 300. The information related to the reflection includes, for example, an identifier of the reflecting reflecting structure, a reflection angle, a beam transmission direction, a frequency of the reflected wave, a beam width, etc. If there are multiple reflecting devices 300, the reflection control information may also include an identifier of each reflecting device 300.

[0063] The reflection control information is included in the broadcast information, for example. The reflection control information may be set in the broadcast information, for example, by the base station device 200. The base station device 200 transmits, for example, broadcast information for reflected waves and broadcast information for terminal devices 100 that perform wireless communication without using reflected waves. The broadcast information for reflected waves is transmitted, for example, in the direction of the reflection device 300.

[0064] Furthermore, the reflection control information may be set in the broadcast information by, for example, the reflection device 300. The reflection device 300 adds the reflection control information to the broadcast information received from, for example, the base station device 200, and reflects the broadcast information at a predetermined angle.

[0065] Furthermore, the reflex control information may be included in a communication or control signal other than the notification information.

[0066] The terminal device 100-2 transmits (reports) to the base station device 200-2 the measurement results including the radio quality of the radio waves from the base station device 200-1 and reflection control information (control information) of the received reflected waves (S105). The reflection control information includes the identifier of the terminal device 100-1 and is the reflection control information corresponding to the terminal device 100-1. The measurement results are included in, for example, a Measurement Report. Furthermore, the measurement results are included in, for example, a handover request.

[0067] Upon receiving the measurement result, the base station device 200-2 determines whether or not the terminal device 100-2 should perform handover based on the reception quality (S106). Then, the base station device 200-2 determines that the terminal device 100-2 should perform handover to the base station device 200-1 (S106).

[0068] The base station device 200-2 transmits a handover request requesting that the terminal device 100-2 perform handover to the base station device 200-1 (S107). The handover request includes the reflection control information received by the terminal device 100-2 and corresponding to the terminal device 100-1.

[0069] In response to the received handover request, the base station device 200-1 permits handover of the terminal device 100-2 (S108). When permitting handover, the base station device 200-1 starts reflection control on the reflection device 300 using reflection control information corresponding to the terminal device 100-2 (S109). The reflection control information corresponding to the terminal device 100-2 includes, for example, an identifier of the terminal device 100-2. The reflection control is, for example, control that adjusts the reflection angle of the reflected wave as the terminal device 100-2 moves (tracks).

[0070] 7 is a diagram showing an example of a reflected wave when reflection control is executed for the terminal device 100-2. The base station device 200 transmits a radio wave W2 for the terminal device 100-2 to the reflection device 300. The radio wave W2 includes reflection control information corresponding to the terminal device 100-2.

[0071] Upon receiving the radio wave W2, the reflection device 300 transmits a reflected wave W3 (second reflected wave). The reflected wave W3 is transmitted, for example, to the position where the terminal device 100-2 received the reflected wave intended for the terminal device 100-1. The reflected wave W3 includes reflection control information (second control information) corresponding to the terminal device 100-2.

[0072] In this case, the reflection device 300 (or the base station device 200-1) transmits a reflected wave to the position where the terminal device 100-2 received the reflected wave for the terminal device 100-1, at least until the handover is completed. The reflection device 300 (or the base station device 200-1) may start tracking the terminal device 100-2 after the terminal device 100-2 transitions to being in communication with the base station device 200-1.

[0073] In addition, the reflected wave W3 may be transmitted in the direction of the location of the terminal device 100-2 by tracking the terminal device 100-2, for example, before the terminal device 100-2 transitions to a state in which it is communicating with the base station device 200-1 (a state in which a wireless connection is in progress).

[0074] The reflection control information may be added to the reflected wave by the reflection device 300. In this case, the radio wave transmitted by the base station device 200-1 does not include the reflection control information. The reflection device 300 receives the radio wave not including the reflection control information from the base station device 200-1, and transmits a reflected wave W1 added with the reflection control information corresponding to the terminal device 100-1 and a reflected wave W3 added with the reflection control information corresponding to the terminal device 100-2 at the respective reflection angles (directions).

[0075] Returning to the sequence of FIG. 6, in response to the reflection control of the base station device 200-1, the reflection device 300 starts reflection control for the terminal device 100-2 (S110).

[0076] Meanwhile, the base station device 200-1 transmits a handover permission to the base station device 200-2 to permit the handover (S111). The handover permission includes reflection control information corresponding to the terminal device 100-2.

[0077] Upon receiving the handover permission, the base station device 200-2 transmits a handover instruction to the terminal device 100-2 (S112). The handover instruction includes handover information related to the handover and reflection control information corresponding to the terminal device 100-2.

[0078] When the terminal device 100-2 receives the handover instruction, it starts handover to the base station device 200-1 (S113). In the handover process, the terminal device 100-2 may, for example, adjust the direction of reception of radio waves according to the angle of reflection included in the reflection control information corresponding to the terminal device 100-2, or search for a reflection including its own identifier.

[0079] In the first embodiment, the reflection device 300 starts reflection control for the terminal device 100-2 prior to the handover process of the terminal device 100-2. As a result, even if the reflected wave moves as the terminal device 100-1 moves, the terminal device 100-2 can receive the reflection intended for the terminal device 100-2, reducing handover failures.

[0080] [Second embodiment] Next, a second embodiment will be described. In the first embodiment, the reflecting device 300 is controlled by the base station device 200-1. In the second embodiment, the reflecting device 300 can be controlled by both the base station device 200-1 and the base station device 200-2. When a handover request is made, the base station device 200-2 first controls the reflecting device 300.

[0081] 8 is a diagram illustrating an example of the configuration of a wireless communication system 10. In the second embodiment, the reflection device 300 is subjected to reflection control from the base station device 200-1 via a network N1. The reflection device 300 is also subjected to reflection control from the base station device 200-2 via a network N2. For example, the reflection device 300 may notify the content of the reflection control from one base station device 200 to the other base station device 200. This allows the base station devices 200-1 and 2 to share the content of the reflection control.

[0082] 9 is a diagram showing an example of a sequence in which terminal device 100-2 hands over to base station device 200-1. Processes S101 to S107 are the same as those in the sequence shown in FIG. 6. When controlling reflection device 300, base station device 200-2 may acquire reflection control information from reflection device 300.

[0083] The base station device 200-2 starts reflection control on the reflection device 300 using reflection control information corresponding to the terminal device 100-2 (S201). The reflection control information corresponding to the terminal device 100-2 includes, for example, an identifier of the terminal device 100-2. In response to the reflection control of the base station device 200-2, the reflection device 300 starts reflection control on the terminal device 100-2 (S202).

[0084] Meanwhile, in response to the received handover request, the base station device 200-1 permits handover of the terminal device 100-2 (S203). Then, the base station device 200-1 transmits a handover permission to the base station device 200-2 permitting the handover (S204). The handover permission includes reflection control information corresponding to the terminal device 100-2.

[0085] Upon receiving the handover permission, the base station device 200-2 transmits a handover instruction to the terminal device 100-2 (S205). The handover instruction includes handover information related to the handover and reflection control information corresponding to the terminal device 100-2.

[0086] Upon receiving the handover instruction, the terminal device 100-2 starts handover to the base station device 200-1 (S206).

[0087] If the handover is not permitted, the base station device 200-2 transmits an instruction to the reflection device 300 to stop the reflection control for the terminal device 100-2.

[0088] In the second embodiment, the reflection device 300 precedes the handover process of the terminal device 100-2 and can start reflection control for the terminal device 100-2 before the handover is permitted. This allows the terminal device 100-2 to receive the reflection intended for the terminal device 100-2 even if the reflected wave moves as the terminal device 100-1 moves, further reducing handover failures.

[0089] [Other embodiments] In the first and second embodiments, the terminal device 100-2 acquires reflection control information from the reflected wave, includes the reflection control information in the measurement result, and transmits it to the base station device 200-2. However, the terminal device 100-2 does not have to transmit the reflection control information to the base station device 200-2. In this case, the base station device 200-2 determines, for example, from the location information of the terminal device 100-2 that the terminal device 100-2 is receiving a reflected wave from the base station device 200-1. The base station device 200-2 may then acquire reflection control information related to the reflected wave being transmitted near the location of the terminal device 100-2 from the reflection device 300 that is transmitting the reflected wave. This allows the terminal device 100-2 to perform the same processing regardless of whether the radio wave being received is a reflected wave or not.

[0090] Furthermore, the requirements described in the first and second embodiments and other embodiments may be combined with each other. [Explanation of symbols]

[0091] 10: Wireless communication system 100: Terminal device 110:CPU 120: Storage 121: Terminal wireless communication program 122: Radio wave measurement program 123: Terminal handover execution program 1231: Handover module for terminal reflected wave 1232: Terminal handover module 130: Memory 150: Wireless communication circuit 151: Antenna 200:Base station equipment 210:CPU 220: Storage 221: Wireless communication program 222: Reflector control program 223: Handover execution program 2231: Handover module for reflected waves 2232: Handover module 230: Memory 240: Communication circuit 250: Wireless communication circuit 251: Antenna 300:Reflector 310: CPU 320: Storage 321: Reflex Control Program 330: Memory 340: Communication circuit 370:Reflection structure 400: Shield

Claims

1. a first base station device wirelessly connected to a first terminal device; a second base station device capable of wirelessly connecting with the first terminal device via a reflector; the reflecting device is a first base station device of a wireless communication system, which is controlled by the second base station device, reflects radio waves transmitted by the second base station device, and transmits reflected waves, a receiving unit that receives, from the first terminal device, a measurement result of the radio quality of the reflected wave measured by the first terminal device and control information included in the reflected wave, the control information relating to a reflection angle of the reflected wave; a control unit that transmits the control information to the second base station when requesting a handover of the first terminal device to the second base station; A first base station device having the above.

2. When the second base station device permits handover of the first terminal device, the second base station device generates second control information used to control a second reflected wave used for handover of the first terminal device to the second base station device based on the control information, and controls the reflection device to transmit the second reflected wave based on the second control information. The first base station apparatus according to claim 1 .

3. The control unit further receives the second control information from the second base station device, and transmits a handover permission including the second control information to the first terminal device. The first base station apparatus according to claim 2 .

4. The second control information includes first identification information of the first terminal device. The first base station apparatus according to claim 2 .

5. the control information includes information regarding a reflection angle of the reflected wave, The second control information includes information regarding a reflection angle of the second reflected wave. The first base station apparatus according to claim 4 .

6. a first base station device wirelessly connected to a first terminal device; a second base station device that is wirelessly connected to the first terminal device via a reflector; the reflecting device is a second base station device of a wireless communication system, which is controlled by the second base station device, reflects radio waves transmitted by the second base station device, and transmits reflected waves, a request receiving unit that receives, from the first terminal device, a measurement result of the radio quality of the reflected wave measured by the first terminal device and control information included in the reflected wave, the control information relating to a reflection angle of the reflected wave, and receives the control information from the first base station device when the first terminal device performs a handover to the second base station device; a reflection control unit that generates second control information used to control a second reflected wave used for handover of the first terminal device to the second base station device in accordance with the control information received from the first base station device, and controls the reflection device to transmit the second reflected wave based on the second control information; A second base station device having the above.

7. The reflection control unit transmits a handover permission including the second control information to the first base station device. The second base station apparatus according to claim 6 .

8. a first base station device wirelessly connected to a first terminal device; a second base station device that is wirelessly connected to a second terminal device via a reflector; a reflection control method in the first base station device of a wireless communication system, wherein the reflection device is controlled by the first base station device and the second base station device, reflects a radio wave transmitted by the second base station device to the second terminal device, and transmits a reflected wave toward the second terminal device, receiving, from the first terminal device, a measurement result of the radio quality of the reflected wave measured by the first terminal device; When the measurement result satisfies a condition for handing over of the first terminal device to the second base station device, control information regarding a reflection angle of the reflected wave, which is information contained in the reflected wave, is included in a handover request and transmitted to the second base station device. Reflex control method.

9. a first base station device wirelessly connected to a first terminal device; a second base station device that is wirelessly connected to a second terminal device via a reflector; the reflecting device is controlled by the second base station device, reflects a radio wave transmitted from the second base station device to the second terminal device, and transmits a reflected wave toward the second terminal device; the first terminal device receives the reflected wave and transmits a measurement result of the radio quality of the reflection to the first base station device; When the measurement result satisfies a condition for handing over the first terminal device to the second base station device, the first base station device includes control information, which is information included in the reflected wave and relates to a reflection angle of the reflected wave, in a handover request and transmits the control information to the second base station device; When permitting the first terminal device to hand over to the second base station device, the second base station device generates, based on the control information, second control information used to control a second reflected wave used for handing over of the first terminal device to the second base station device, and controls the reflection device to transmit the second reflected wave based on the second control information. The reflection device transmits the second reflected wave toward the first terminal device based on the second control information in response to the control. Wireless communication system.

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