WO2022118408A1 - 無線通信方法、無線通信システム、及び電波反射装置 - Google Patents
無線通信方法、無線通信システム、及び電波反射装置 Download PDFInfo
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- WO2022118408A1 WO2022118408A1 PCT/JP2020/044909 JP2020044909W WO2022118408A1 WO 2022118408 A1 WO2022118408 A1 WO 2022118408A1 JP 2020044909 W JP2020044909 W JP 2020044909W WO 2022118408 A1 WO2022118408 A1 WO 2022118408A1
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- base station
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 18
- 238000003384 imaging method Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 241000282412 Homo Species 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/04013—Intelligent reflective surfaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/46—Indirect determination of position data
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/145—Passive relay systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to a wireless communication method, a wireless communication system, and a radio wave reflecting device.
- a radio wave reflecting device (including a reflector) that reflects radio waves between a base station and a wireless terminal and relays communication is known.
- some radio wave reflecting devices are provided with a dynamic reflector (IRS: Intelligent Reflecting Surface, etc.) that can control the phase of the incoming wave when the radio wave is reflected.
- the radio wave reflecting device provided with the dynamic reflecting plate can expand the range in which wireless communication can be performed by changing the reflecting direction of the radio wave.
- Patent Document 1 discloses a technique of capturing an image showing the surrounding situation of a base station with a camera and determining the presence or absence of a shield that deteriorates wireless communication between the base station and a user terminal.
- a human being holds and uses a wireless terminal, it may block radio waves such as millimeter waves depending on the orientation of the human body. That is, even if the radio wave reflecting device radiates the radio wave toward the wireless terminal, there is a problem that the radio wave does not reach the wireless terminal sufficiently because the human body blocks the radio wave.
- the present invention has been made in view of the above-mentioned problems, and is a wireless communication method and a wireless communication system capable of preventing a human body from blocking radio waves with respect to a wireless terminal used by a human. , And to provide a radio wave reflecting device.
- the wireless communication method is a wireless communication in which a plurality of radio wave reflecting devices reflect radio waves transmitted by a base station toward a wireless terminal capable of transmitting compass information while a person is looking at a display screen.
- a reflection step in which each of the radio wave reflecting devices reflects a radio wave by a reflecting unit
- an imaging step in which each of the radio wave reflecting devices takes an image, and an image taken by each of the radio wave reflecting devices, the inside of the image.
- the propagation path between the reflecting unit and the wireless terminal can be seen.
- a plurality of radio wave reflecting devices reflect radio waves transmitted by a base station toward a wireless terminal capable of transmitting compass information while a person is looking at a display screen.
- each of the radio wave reflecting devices determines the position of a person photographed in the image based on a reflecting unit that reflects radio waves, an imaging unit that captures an image, and an image captured by the imaging unit. Whether or not the propagation path between the reflection unit and the radio terminal can be seen based on the detection unit to be detected, the position of the person detected by the detection unit, and the compass information transmitted by the radio terminal.
- the base station receives the line-of-sight information from each of the radio wave reflection devices. And, based on each of the line-of-sight information received by the receiving unit, the selection unit selects the radio wave reflecting device whose propagation path between the reflecting unit and the wireless terminal is the line-of-sight, and the selection unit selects. It is characterized by having a control unit that controls the wireless terminal and the base station to perform wireless communication by the radio wave reflected by the radio wave reflecting device.
- the radio wave reflecting device is a radio wave reflecting device that reflects radio waves transmitted by a base station toward a wireless terminal capable of transmitting compass information while a person is looking at a display screen.
- a reflection unit that reflects radio waves, an image pickup unit that captures an image, a detection unit that detects the position of a person photographed in the image based on the image captured by the image pickup unit, and a person that the detection unit detects.
- a determination unit for determining whether or not the propagation path between the reflection unit and the radio terminal is visible, and a result of the determination It is characterized by having a transmission unit that transmits the line-of-sight information indicating the above to the base station.
- the present invention it is possible to prevent the human body from blocking radio waves with respect to a wireless terminal used by a person.
- FIG. 1 is a diagram schematically showing a configuration example of a wireless communication system 1 according to an embodiment.
- the wireless communication system 1 has, for example, two base stations 2-1 and 2-2 and five radio wave reflecting devices 3-1 to 3-5, and a human (person) A has. It is possible to perform high frequency band wireless communication using the wireless terminal 4.
- the wireless terminal 4 is, for example, a smartphone having a display screen 40 on its surface. Further, the wireless terminal 4 is capable of transmitting compass information indicating the direction in which the wireless terminal is directed. For example, the wireless terminal 4 can transmit compass information even when the person A is looking at the display screen 40.
- the wireless terminal 4 transmits compass information indicating the north direction when the person A facing the north direction is operating while looking at the display screen 40 in front of himself / herself.
- the wireless terminal 4 is configured to be able to communicate with another communication device via any of the base stations 2-1 and 2.
- the radio wave reflecting device 3-1 has a reflecting unit 30 and an imaging unit 31, which will be described later, and is installed, for example, on the north side of the wireless terminal 4, and reflects and relays the radio waves transmitted by the base station 2-1.
- the radio wave reflecting device 3-2 has a reflecting unit 30 and an imaging unit 31, and is installed, for example, on the northwest side of the wireless terminal 4, and reflects and relays the radio waves transmitted by the base station 2-1.
- the radio wave reflecting device 3-3 has a reflecting unit 30 and an imaging unit 31, and is installed, for example, on the west side of the wireless terminal 4, and reflects and relays the radio waves transmitted by the base station 2-1.
- the radio wave reflecting device 3-4 has a reflecting unit 30 and an imaging unit 31, and is installed, for example, on the south side of the wireless terminal 4, and reflects and relays the radio waves transmitted by the base station 2-2.
- the radio wave reflecting device 3-5 has a reflecting unit 30 and an imaging unit 31, and is installed, for example, on the southeast side of the wireless terminal 4, and reflects and relays the radio waves transmitted by the base station 2-2.
- the wireless terminal 4 itself communicates with the base station 2-1 regardless of which of the radio wave reflecting devices 3-1 to 3-3 reflects and relays the radio wave transmitted by the base station 2-1. It is possible to communicate with the base station 2-2 regardless of which of the radio wave reflecting devices 3-4 and 3-5 reflects and relays the radio wave transmitted by the base station 2-2. The case where the position is possible will be described as an example.
- the radio waves transmitted by the base stations 2-1 and 2-2 are high frequency band radio waves that may be shielded by the human body when the person A is in the propagation path.
- the radio terminal 4 relays the radio wave transmitted by the base station 2-1 by any of the radio wave reflecting devices 3-1 to 3-3 and relays the base station 2-. It shows a state in which the radio wave transmitted by the base station 2-2, which can communicate with 1 and is reflected and relayed by the radio wave reflecting device 3-4, 3-5, is blocked by the person A. ..
- a specific operation example of the wireless communication system 1 will be described later.
- FIG. 2 is a functional block diagram illustrating the functions of the radio wave reflecting device 3 according to the embodiment.
- the radio wave reflecting device 3 has a reflecting unit 30, an imaging unit 31, and a main body unit 32.
- the reflecting unit 30 is a reflector or the like that reflects the radio waves transmitted by the base station 2 or the wireless terminal 4 to the wireless terminal 4 or the base station 2 and relays the radio waves.
- the image pickup unit 31 is, for example, a camera or the like, and captures the surroundings of the radio wave reflecting device 3 as an image, and outputs the captured image to the main body unit 32.
- the main body unit 32 has a receiving unit 320, a transmitting unit 321, a detecting unit 322, a determination unit 323, a storage unit 324, and a control unit 325.
- the receiving unit 320 receives the radio wave transmitted by the wireless terminal 4 or the base station 2, and stores the received information in the storage unit 324.
- the receiving unit 320 receives the compass information transmitted by the wireless terminal 4, the terminal identification code of the wireless terminal 4, and the like, and stores it in the storage unit 324.
- the transmission unit 321 transmits a radio wave (signal) to the base station 2.
- the transmission unit 321 transmits outlook information and the like, which will be described later, to the base station 2.
- the detection unit 322 acquires an image taken by the image pickup unit 31, analyzes and detects the position of the person photographed in the image, regards the detected position as, for example, the position of the wireless terminal 4, and sends the determination unit 323 to the determination unit 323. Output. Further, the detection unit 322 detects the direction (propagation path direction information) from the radio wave reflection device 3 toward the wireless terminal 4 depending on the angle at which the image pickup unit 31 takes a picture of a person.
- the determination unit 323 acquires the position of the person detected by the detection unit 322 (position information of the wireless terminal 4) and the propagation path direction information from the detection unit 322, and acquires the compass information transmitted by the wireless terminal 4 from the storage unit 324. .. Then, the determination unit 323 can see the propagation path between the reflection unit 30 (radio wave reflected by the reflection unit 30) and the radio terminal 4 based on the position information, the propagation path direction information, and the compass information of the radio terminal 4. (LOS: Line Of Sight) is determined, and the line-of-sight information indicating the determined result is output to the storage unit 324.
- LOS Line Of Sight
- the storage unit 324 stores the above-mentioned compass information, terminal identification code, position information of the wireless terminal 4, propagation path direction information, line-of-sight information, and the like, and outputs the stored information according to the control of the control unit 325.
- the control unit 325 controls each unit constituting the radio wave reflecting device 3. Specifically, the control unit 325 controls the operation of the image pickup unit 31 and the communication between the radio wave reflecting device 3 and the base station 2.
- the radio wave reflecting devices 3-1 to 3-5 control the radiation unit (dynamic reflecting plate, etc.) having a plurality of elements (reflecting elements, etc.), respectively, to control the base stations 2-1 and 2-2.
- the signal transmitted by the radio terminal 4 may be reflected toward the radio terminal 4, and the signal transmitted by the radio terminal 4 may be reflected toward the base stations 2-1 and 2.2.
- FIG. 3 is a functional block diagram illustrating the functions of the base station 2. As shown in FIG. 3, the base station 2 has an antenna portion 20 and a main body portion 21.
- the antenna unit 20 is provided with, for example, a plurality of antennas (not shown) and radiates radio waves in a predetermined direction due to a phase difference.
- the main body 21 has a receiving unit 22, a storage unit 23, a propagation path processing unit 24, a transmitting unit 25, a communication processing unit 26, and a control unit 27.
- the receiving unit 22 receives the radio wave (signal) transmitted by the radio wave reflecting device 3 and the wireless terminal 4 via the antenna unit 20, and outputs a predetermined signal to the storage unit 23 and the communication processing unit 26.
- the receiving unit 22 receives the above-mentioned line-of-sight information from each of the radio wave reflecting devices 3, and receives a transmission signal (relay signal) to be relayed transmitted by the wireless terminal 4.
- the storage unit 23 has, for example, a reception information storage unit 230 and a terminal information storage unit 232.
- the reception information storage unit 230 stores, for example, line-of-sight information transmitted by the radio wave reflection device 3, and outputs the information according to the control of the control unit 27.
- the terminal information storage unit 232 stores, for example, terminal identification information transmitted by the wireless terminal 4, and outputs the information according to the control of the control unit 27.
- the propagation path processing unit 24 has, for example, an inquiry signal generation unit 240 and a selection unit 242.
- the inquiry signal generation unit 240 generates an inquiry signal used by the radio wave reflecting device 3 to determine whether or not the propagation path is visible, and outputs the inquiry signal to the transmission unit 25.
- the selection unit 242 acquires each line-of-sight information from the received information storage unit 230, and selects and selects the radio wave reflection device 3 whose propagation path between the reflection unit 30 and the wireless terminal 4 is line-of-sight based on the line-of-sight information. The result is output to the transmission unit 25.
- the selection unit 242 when there are a plurality of radio wave reflecting devices 3 in which the propagation path between the reflecting unit 30 and the wireless terminal 4 is visible, the radio wave reflecting device 3 has the shortest distance between the reflecting unit 30 and the wireless terminal 4. May be configured to select. Further, the selection unit 242 may select the radio wave reflection device 3 based on the communication quality of the uplink communication or the downlink communication between the reflection unit 30 and the wireless terminal 4.
- the transmission unit 25 transmits a signal based on the signals input from the storage unit 23, the propagation path processing unit 24, and the communication processing unit 26 via the antenna unit 20.
- the communication processing unit 26 performs communication processing for the wireless terminal 4 to communicate with another communication device. For example, the communication processing unit 26 acquires and processes a signal to be relayed (relay signal) transmitted by the wireless terminal 4 via the antenna unit 20 and the receiving unit 22, and processes the signal via the transmitting unit 25 and the antenna unit 20. Perform the process for sending.
- a signal to be relayed relay signal
- the control unit 27 controls each unit constituting the base station 2, controls for selecting a radio wave reflecting device 3 that relays a signal to the wireless terminal 4, and the wireless terminal 4 communicates with another communication device. Control for the purpose. For example, the control unit 27 controls the wireless terminal 4 and the base station 2 to perform wireless communication by the radio wave reflected by the radio wave reflecting device 3 selected by the selection unit 242.
- FIG. 4 is a flowchart showing an operation example of the radio wave reflecting device 3.
- each of the radio wave reflecting devices 3 captures an image (S100) as shown in FIG. 4, and detects the position of the photographed person in the captured image based on the captured image (S102).
- the radio wave reflecting device 3 can see the propagation path between the reflecting unit 30 and the wireless terminal 4 based on the detected position of the person (position information of the wireless terminal 4) and the compass information transmitted by the wireless terminal 4. (S104).
- the radio wave reflecting device 3 stores compass information, position information of the wireless terminal 4, line-of-sight information, and the like (S106).
- FIG. 5 is a flowchart showing an operation example of the base station 2.
- the base station 2 has a radio wave whose line of sight is the propagation path between the radio wave reflecting device 3 (reflecting unit 30) and the radio terminal 4 based on the line-of-sight information received from the radio wave reflecting device 3.
- the base station 2 controls the wireless terminal 4 and the base station 2 to perform wireless communication by the radio wave reflected by the selected radio wave reflecting device 3 (S202).
- the wireless communication system 1 is used by humans because it controls the wireless terminal 4 and the base station 2 to perform wireless communication by the radio waves reflected by the radio wave reflecting device 3 selected by the base station 2. It is possible to prevent the human body from blocking radio waves with respect to the wireless terminal 4.
- Each function of the base station 2 and the radio wave reflecting device 3 may be partially or wholly configured by hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array), or may be configured by hardware such as a CPU or the like. It may be configured as a program executed by the processor of.
- hardware such as PLD (Programmable Logic Device) or FPGA (Field Programmable Gate Array)
- the radio wave reflecting device 3 according to the present invention can be realized by using a computer and a program, and the program can be recorded on a storage medium or provided through a network.
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Abstract
Description
Claims (5)
- 人が表示画面を見ている状態でコンパス情報を送信可能な無線端末に向けて基地局が送信する電波を複数の電波反射装置が反射させる無線通信方法において、
前記電波反射装置それぞれが電波を反射部により反射させる反射工程と、
前記電波反射装置それぞれが画像を撮影する撮像工程と、
前記電波反射装置それぞれが撮影した画像に基づいて、当該画像内に撮影された人の位置を検出する検出工程と、
検出した人の位置、及び前記無線端末が送信したコンパス情報に基づいて、前記反射部と前記無線端末との間の伝搬路それぞれが見通しとなるか否かを判定する判定工程と、
判定した結果を示す見通し情報それぞれに基づいて、前記反射部と前記無線端末との間の伝搬路が見通しとなる前記電波反射装置を選択する選択工程と、
選択した前記電波反射装置が反射させる電波によって前記無線端末と前記基地局とが無線通信を行うように制御する制御工程と
を含むことを特徴とする無線通信方法。 - 前記選択工程では、
前記反射部と前記無線端末との間の伝搬路が見通しとなる前記電波反射装置が複数ある場合、前記反射部と前記無線端末との距離が最も短い前記電波反射装置を選択すること
を特徴とする請求項1に記載の無線通信方法。 - 人が表示画面を見ている状態でコンパス情報を送信可能な無線端末に向けて基地局が送信する電波を複数の電波反射装置が反射させる無線通信システムにおいて、
前記電波反射装置それぞれは、
電波を反射させる反射部と、
画像を撮影する撮像部と、
前記撮像部が撮影した画像に基づいて、当該画像内に撮影された人の位置を検出する検出部と、
前記検出部が検出した人の位置、及び前記無線端末が送信したコンパス情報に基づいて、前記反射部と前記無線端末との間の伝搬路が見通しとなるか否かを判定する判定部と、
前記判定部が判定した結果を示す見通し情報を前記基地局へ送信する送信部と
を有し、
前記基地局は、
前記電波反射装置それぞれから前記見通し情報を受信する受信部と、
前記受信部が受信した前記見通し情報それぞれに基づいて、前記反射部と前記無線端末との間の伝搬路が見通しとなる前記電波反射装置を選択する選択部と、
前記選択部が選択した前記電波反射装置が反射させる電波によって前記無線端末と前記基地局とが無線通信を行うように制御する制御部と
を有することを特徴とする無線通信システム。 - 前記選択部は、
前記反射部と前記無線端末との間の伝搬路が見通しとなる前記電波反射装置が複数ある場合、前記反射部と前記無線端末との距離が最も短い前記電波反射装置を選択すること
を特徴とする請求項3に記載の無線通信システム。 - 人が表示画面を見ている状態でコンパス情報を送信可能な無線端末に向けて基地局が送信する電波を反射させる電波反射装置において、
電波を反射させる反射部と、
画像を撮影する撮像部と、
前記撮像部が撮影した画像に基づいて、当該画像内に撮影された人の位置を検出する検出部と、
前記検出部が検出した人の位置、及び前記無線端末が送信したコンパス情報に基づいて、前記反射部と前記無線端末との間の伝搬路が見通しとなるか否かを判定する判定部と、
前記判定部が判定した結果を示す見通し情報を前記基地局へ送信する送信部と
を有することを特徴とする電波反射装置。
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JP2019009531A (ja) * | 2017-06-21 | 2019-01-17 | ソフトバンク株式会社 | 無給電中継装置及び無線中継システム |
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JP2019009531A (ja) * | 2017-06-21 | 2019-01-17 | ソフトバンク株式会社 | 無給電中継装置及び無線中継システム |
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