WO2024014411A1 - 無線通信システムおよび無線通信方法 - Google Patents

無線通信システムおよび無線通信方法 Download PDF

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Publication number
WO2024014411A1
WO2024014411A1 PCT/JP2023/025286 JP2023025286W WO2024014411A1 WO 2024014411 A1 WO2024014411 A1 WO 2024014411A1 JP 2023025286 W JP2023025286 W JP 2023025286W WO 2024014411 A1 WO2024014411 A1 WO 2024014411A1
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WO
WIPO (PCT)
Prior art keywords
radio wave
receiving antenna
transmitting
radio
antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/025286
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English (en)
French (fr)
Japanese (ja)
Inventor
信樹 平松
俊翔 黄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP2024533692A priority Critical patent/JP7783423B2/ja
Publication of WO2024014411A1 publication Critical patent/WO2024014411A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • 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

Definitions

  • the present disclosure relates to a wireless communication system and a wireless communication method.
  • wireless communication systems such as 4G (4th generation mobile communication system) and 5G (5th generation mobile communication system) perform half-duplex wireless communication in which a transmitting antenna and a receiving antenna are shared.
  • 4G (4th generation mobile communication system) and 5G (5th generation mobile communication system) perform half-duplex wireless communication in which a transmitting antenna and a receiving antenna are shared.
  • 5G (5th generation mobile communication system) performs half-duplex wireless communication in which a transmitting antenna and a receiving antenna are shared.
  • full-duplex wireless communication in which a transmitting antenna and a receiving antenna are separate has been proposed (see, for example, Patent Document 1).
  • the wireless communication system of the present disclosure includes a first wireless station having a first transmitting/receiving antenna, a second wireless station having a second transmitting/receiving antenna, and installed between the first wireless station and the second wireless station. , between the first radio wave control board that emits radio waves transmitted from the first transmitting/receiving antenna at a predetermined control angle, the first radio station, and the second radio station; a second radio wave control board installed along a first direction and configured to emit radio waves transmitted from the second transmitting/receiving antenna at a predetermined control angle; The antenna is configured separately.
  • the wireless communication method of the present disclosure includes the steps of receiving radio waves transmitted from a transmitting antenna of a first radio station with a first radio wave control board, emitting them at a predetermined control angle, and causing them to be received by a transmitting and receiving antenna of a second radio station;
  • the method includes the steps of receiving radio waves transmitted from the transmitting/receiving antenna of the second radio station with a second radio wave control board, emitting them at a predetermined control angle, and causing the receiving antenna of the first radio station to receive them.
  • FIG. 1 is a diagram for explaining a full-duplex wireless communication method according to a comparative example.
  • FIG. 2 is a diagram for explaining a configuration example of the wireless communication system according to the first embodiment.
  • FIG. 3 is a diagram schematically showing an example of a radio wave refraction plate.
  • FIG. 4 is a diagram for explaining the refraction angle of the radio wave refraction plate according to the first embodiment.
  • FIG. 5 is a diagram for explaining the method of installing the radio wave refraction plate according to the first embodiment.
  • FIG. 6 is a diagram illustrating a configuration example of a wireless communication system according to a first modification of the first embodiment.
  • FIG. 7 is a diagram illustrating a configuration example of a wireless communication system according to a second modification of the first embodiment.
  • FIG. 8 is a diagram for explaining a configuration example of a wireless communication system according to the second embodiment.
  • FIG. 1 is a diagram for explaining a full-duplex wireless communication method according to a comparative example.
  • the wireless communication system 1a includes a first wireless station 10 and a second wireless station 20.
  • the wireless communication system 1a is a wireless communication system that performs full-duplex wireless communication.
  • the first wireless station 10 includes a first transmitting antenna 12 and a first receiving antenna 14.
  • the second wireless station 20 includes a second transmitting antenna 22 and a second receiving antenna 24.
  • the distance D1 between the first transmitting antenna 12 and the first receiving antenna 14, and the distance between the second transmitting antenna 22 and the second receiving antenna 24 are determined.
  • D2 had to be secured over a very long distance (eg 10m). That is, in the comparative example, there is a limit to the space in which the first wireless station 10 and the second wireless station 20 are installed.
  • FIG. 2 is a diagram for explaining a configuration example of the wireless communication system according to the first embodiment.
  • the wireless communication system 1 includes a first wireless station 10, a second wireless station 20, a first radio wave refraction plate 32, and a second radio wave refraction plate 34.
  • the wireless communication system 1 is a wireless communication system that performs full-duplex wireless communication.
  • the wireless communication system 1 includes a first radio wave refraction plate 32 and a second radio wave refraction plate 34, compared to the wireless communication system 1a shown in FIG.
  • the first wireless station 10 includes a first transmitting antenna 12 and a first receiving antenna 14.
  • the first transmitting antenna 12 and the first receiving antenna 14 are configured separately.
  • the first transmitting antenna 12 and the first receiving antenna are types of first transmitting and receiving antennas.
  • the first transmitting antenna 12 and the first receiving antenna 14 are installed at the first wireless station 10 with a predetermined interval (for example, within 1 m).
  • the first transmitting antenna 12 and the first receiving antenna 14 are configured such that the isolation between the first transmitting antenna 12 and the first receiving antenna 14 is, for example, 20 [dB (decibel)] or more. has been done.
  • the first transmitting antenna 12 is configured to transmit the radio wave W1 toward the first radio wave refracting plate 32.
  • the second wireless station 20 includes a second transmitting antenna 22 and a second receiving antenna 24.
  • the second transmitting antenna 22 and the second receiving antenna 24 are configured separately.
  • the second transmitting antenna 22 and the second receiving antenna 24 are a type of second transmitting and receiving antenna.
  • the second transmitting antenna 22 and the second receiving antenna 24 are installed at the second wireless station 20 with a predetermined interval (for example, within 1 m).
  • the second transmitting antenna 22 and the second receiving antenna 24 are configured such that the isolation between the second transmitting antenna 22 and the second receiving antenna 24 is, for example, 20 [dB] or more. .
  • the second transmitting antenna 22 is configured to transmit the radio wave W2 toward the second radio wave refraction plate 34.
  • the first radio wave refraction plate 32 and the second radio wave refraction plate 34 are installed between the first radio station 10 and the second radio station 20.
  • the first radio wave refracting plate 32 and the second radio wave refracting plate 34 are configured to refract received radio waves at a predetermined angle and emit the received radio waves.
  • the first radio wave refraction plate 32 and the second radio wave refraction plate 34 may be made of, for example, a metamaterial that changes the phase of an incident wave.
  • the first radio wave refraction plate 32 and the second radio wave refraction plate 34 are a type of radio wave control plate.
  • FIG. 3 is a diagram schematically showing an example of a radio wave refraction plate.
  • the first radio wave refraction plate 32 may include, for example, a substrate 40, an element 42, an element 44, an element 46, and an element 48.
  • the configuration of the second radio wave refraction plate 34 is the same as the configuration of the first radio wave refraction plate 32, so a description thereof will be omitted.
  • Element 42 , element 44 , element 46 , and element 48 may be formed on substrate 40 .
  • the substrate 40 may have a rectangular shape, for example, but is not limited thereto.
  • Elements 42, 44, 46, and 48 may be two-dimensionally arranged on substrate 40. Specifically, in FIG. 3, a plurality of elements 42 may be installed in a line at the bottom of the substrate 40.
  • a plurality of elements 44 may be installed in a row on a level above the level where the elements 42 are installed.
  • a plurality of elements 46 may be installed in a row on a level above the level where the elements 44 are installed.
  • a plurality of elements 48 may be installed in a row on a level above the level where the elements 46 are installed. That is, the first radio wave refraction plate 32 may have a structure in which a plurality of elements of different sizes are periodically arranged.
  • the elements 42 to 48 may differ in the amount of change in the frequency band and phase of the radio waves to be changed. Although each of the elements 42 to 48 has a rectangular shape, the shape is not limited to this. By changing the sizes and shapes of elements 42, 44, 46, and 48, it is possible to adjust the amount of change in the frequency band and phase of the radio waves to be refracted.
  • FIG. 4 is a diagram for explaining the refraction angle of the radio wave refraction plate according to the first embodiment.
  • the transmitting antenna 12a and the receiving antenna 24a communicate via a radio wave refracting plate 30.
  • the incident angle ⁇ 11 of the radio wave W11 with respect to the radio wave refraction plate 30 is , 0°.
  • the first radio wave refracting plate 32 is installed so that the radio wave W1 from the first transmitting antenna 12 is perpendicularly incident on the refracting surface.
  • the first radio wave refracting plate 32 is configured to refract the radio wave W1 and emit the radio wave W3 toward the second radio station 20.
  • the refraction angle ⁇ 1 of the first radio wave refraction plate 32 is defined by a direction connecting the first transmitting antenna 12 to the center of the first radio wave refraction plate 32 and a direction connecting the center of the first radio wave refraction plate 32 to the second reception antenna 24. It is composed of the angle formed by the direction connecting the
  • the second radio wave refraction plate 34 is installed so that the radio wave W2 from the second transmitting antenna 22 is perpendicularly incident on the refraction surface.
  • the second radio wave refracting plate 34 is configured to refract the radio wave W2 and emit the radio wave W4 toward the first wireless station 10.
  • the refraction angle ⁇ 2 of the second radio wave refraction plate 34 is defined by a direction connecting the second transmitting antenna 22 to the center of the second radio wave refraction plate 34 and a direction connecting the center of the second radio wave refraction plate 34 to the first reception antenna 14. It is composed of the angle formed by the direction connecting the
  • the refraction angle ⁇ 1 of the first radio wave refraction plate 32 and the refraction angle ⁇ 2 of the second radio wave refraction plate 34 are a type of control angle of the radio wave control plate.
  • the first radio wave refracting plate 32 has a linear distance between the first transmitting antenna 12 and the first radio wave refracting plate 32, and a straight line distance between the first radio wave refracting plate 32 and the second receiving antenna 24.
  • the installation is in the Fresnel zone, defined based on
  • the second radio wave refracting plate 34 has a linear distance between the second transmitting antenna 22 and the second radio wave refracting plate 34 and a straight line distance between the second radio wave refracting plate 34 and the first receiving antenna 14.
  • the installation is in the Fresnel zone, defined based on
  • FIG. 5 is a diagram for explaining the method of installing the radio wave refraction plate according to the first embodiment.
  • An example in which the first radio wave refraction plate 32 is installed will be described below.
  • the method for installing the second radio wave refraction plate 34 is the same as the method for installing the first radio wave refraction plate 32, so a description thereof will be omitted.
  • the center point O indicates the center point of the first radio wave refracting plate 32.
  • a transmission point T indicates the position of the first transmitting antenna 12 of the first wireless station 10 shown in FIG.
  • a receiving point R indicates the position of the second receiving antenna 24 of the second wireless station 20 shown in FIG.
  • the receiving point R' represents a virtual receiving antenna by extending a straight line connecting the first transmitting antenna 12 to the center of the first radio wave refracting plate 32.
  • the straight-line distance between the center point O and the receiving point R is the same as the straight-line distance between the center point O and the receiving point R'.
  • the first radio wave refraction plate 32 When considering the route from the transmission point T of radio waves to the reception point R passing through a point on the first radio wave refraction plate 32, the first radio wave refraction plate 32 is installed in an area where radio waves strengthen each other. Thereby, this embodiment can obtain higher received power.
  • a region where radio waves strengthen each other is called an odd-numbered Fresnel zone, and a region where radio waves weaken each other is called an even-numbered Fresnel zone.
  • the center point of the first radio wave refracting plate 32 is defined as a center point O.
  • dTx be the straight-line distance between the transmission point T and the center point O.
  • dRx be the straight-line distance between the receiving point R and the center point O.
  • n is a natural number and ⁇ is the wavelength of the radio wave.
  • the annular portion in the range from radius rn-1 to radius rn is defined as the n-th Fresnel zone.
  • a first Fresnel zone 50, a second Fresnel zone 52, a third Fresnel zone 54, and a fourth Fresnel zone 56 are shown.
  • the range of a circle with radius r1 becomes the first Fresnel zone 50.
  • the range of the annular portion between the circle with radius r1 and the circle with radius r2 becomes the second Fresnel zone 52.
  • the size of the first radio wave refracting plate 32 is preferably set to, for example, twice or more the radius of the first Fresnel zone 50.
  • the radius of the nth Fresnel zone is also called the nth Fresnel radius.
  • the size of the first radio wave refracting plate 32 may be set within a range of ⁇ 25% of twice the first Fresnel radius. In other words, the size of the first radio wave refracting plate 32 is as follows.
  • the radius may be set within a range of 75% or more and 125% or less of twice the radius of the first Fresnel zone.
  • the first radio wave refraction plate 32 and the second radio wave refraction plate 34 are installed between the first radio station 10 and the second radio station 20. are doing.
  • the distance between the first transmitting antenna 12 and the first receiving antenna 14 and the distance between the second transmitting antenna 22 and the second receiving antenna 24 can be set at short intervals such as within 1 m to achieve full duplex operation. Can communicate.
  • the space for installing the first wireless station 10 and the second wireless station 20 becomes smaller, so that restrictions on installation locations can be reduced.
  • FIG. 6 is a diagram illustrating a configuration example of a wireless communication system according to a first modification of the first embodiment.
  • the wireless communication system 1A includes a first wireless station 10, a second wireless station 20, a first radio wave reflector 62, and a second radio wave reflector 64.
  • the wireless communication system 1A is different from the wireless communication system 1 shown in FIG. include.
  • the first radio wave reflecting plate 62 and the second radio wave reflecting plate 64 are installed between the first radio station 10 and the second radio station 20.
  • the first radio wave reflecting plate 62 and the second radio wave reflecting plate 64 are configured to reflect the received radio waves at a predetermined angle and emit them.
  • the first radio wave reflecting plate 62 and the second radio wave reflecting plate 64 may be made of, for example, a metamaterial that changes the phase of an incident wave.
  • the first radio wave reflecting plate 62 and the second radio wave reflecting plate 64 are a type of radio wave control plate.
  • the first radio wave reflecting plate 62 is installed so that the radio wave W1 from the first transmitting antenna 12 is incident on the reflecting surface.
  • the first radio wave reflecting plate 62 is configured to emit a radio wave W5, which is a result of reflecting the radio wave W1, toward the second radio station 20.
  • the reflection angle ⁇ 3 of the first radio wave reflecting plate 62 is configured to be an angle at which the radio wave W5 is emitted toward the second receiving antenna 24.
  • the second radio wave reflecting plate 64 is installed so that the radio wave W2 from the second transmitting antenna 22 is incident on the reflecting surface.
  • the second radio wave reflecting plate 64 is configured to emit a radio wave W6, which is a result of reflecting the radio wave W2, toward the first radio station 10.
  • the reflection angle ⁇ 4 of the second radio wave reflecting plate 64 is configured to be an angle at which the radio waves W6 are emitted toward the first receiving antenna 14.
  • the reflection angle ⁇ 3 of the first radio wave reflection plate 62 and the reflection angle ⁇ 4 of the second radio wave reflection plate 64 are a type of control angle of the radio wave control plate.
  • two radio wave reflecting plates are provided between the first radio station 10 and the second radio station 20.
  • a board is installed.
  • the distance between the first transmitting antenna 12 and the first receiving antenna 14 and the distance between the second transmitting antenna 22 and the second receiving antenna 24 can be set at short intervals such as within 1 m to achieve full duplex operation. Can communicate.
  • the first radio wave refracting plate 32 and the second radio wave refracting plate 34 and the first radio wave reflecting plate 62 and the second radio wave reflecting plate 64 may be used selectively depending on the installation space, for example. good.
  • each wireless communication system will be described as including the first radio wave refraction plate 32 and the second radio wave refraction plate 34, but the present disclosure is not limited thereto.
  • Each of the following wireless communication systems may include a first radio wave reflection plate 62 and a second radio wave reflection plate 64 instead of the first radio wave refraction plate 32 and the second radio wave refraction plate 34.
  • the first wireless station 10 includes a first transmitting antenna 12 and a first receiving antenna 14, and the second wireless station 20 includes a second transmitting antenna 22 and a second receiving antenna 24.
  • the present disclosure is not limited thereto.
  • the transmitting antenna and the receiving antenna may be configured separately in at least one of the first wireless station 10 and the second wireless station 20.
  • FIG. 7 is a diagram illustrating a configuration example of a wireless communication system according to a second modification of the first embodiment.
  • the wireless communication system 1B includes a first wireless station 10, a second wireless station 20, a first radio wave refracting plate 32, and a second radio wave refracting plate 34.
  • the second wireless station 20 includes a transmitting/receiving antenna 26 instead of the second transmitting antenna 22 and the second receiving antenna 24.
  • the transmitting/receiving antenna 26 is an antenna in which a transmitting antenna and a receiving antenna are integrated.
  • the second radio station 20 performs full-duplex communication using the transmitting/receiving antenna 26, it has an antenna beam pattern oriented in the azimuth of the first radio wave refracting plate 32 and the second radio wave refracting plate 34.
  • the first wireless station 10 has a transmitting antenna and a receiving antenna configured separately, and the first wireless station 10 has a transmitting antenna and a receiving antenna configured integrally.
  • Full-duplex wireless communication can be performed with two wireless stations 20.
  • FIG. 8 is a diagram for explaining a configuration example of a wireless communication system according to the second embodiment.
  • an obstacle 70 that blocks radio waves is located between the first wireless station 10 and the second wireless station 20.
  • the first transmitting antenna 12 and the second receiving antenna 24 are installed such that the obstacle 70 is located on the straight line L1 connecting the first transmitting antenna 12 and the second receiving antenna 24. That is, the first transmitting antenna 12 is installed in a position with poor visibility, such that the second receiving antenna 24 is hidden behind the obstacle 70 when viewed from the first transmitting antenna 12. Therefore, in the wireless communication system 1C, communication is not directly performed between the first transmitting antenna 12 and the second receiving antenna 24. Thereby, the first transmitting antenna 12 and the second receiving antenna 24 can communicate appropriately via the first radio wave refracting plate 32.
  • the first receiving antenna 14 and the second transmitting antenna 22 are installed such that the obstacle 70 is located on the straight line L2 connecting the first receiving antenna 14 and the second transmitting antenna 22. That is, the first receiving antenna 14 is installed in a position with poor visibility, such that the second transmitting antenna 22 is hidden behind the obstacle 70 when viewed from the first receiving antenna 14. Therefore, in the wireless communication system 1C, communication is not directly performed between the first receiving antenna 14 and the second transmitting antenna 22. Thereby, the first receiving antenna 14 and the second transmitting antenna 22 can communicate appropriately via the second radio wave refraction plate 34.
  • the second embodiment prevents communication from occurring directly between the first transmitting antenna 12 and the second receiving antenna 24 and between the first receiving antenna 14 and the second transmitting antenna 22. It can be prevented. Thereby, the second embodiment can more appropriately suppress radio wave interference when performing full-duplex communication.
  • the first transmitting antenna 12 is installed in a position where the second receiving antenna 24 cannot be seen from the first transmitting antenna 12 .
  • the first receiving antenna 14 is installed in a position where the second transmitting antenna 22 cannot be seen from the first receiving antenna 14 .
  • the distance between the first radio wave refracting plate 32 and the second radio wave refracting plate 34 is the same as the distance between the first transmitting antenna 12 and the first receiving antenna 14 and the distance between the second transmitting antenna 22 and the second receiving antenna 24. If the interval is smaller than , self-interference may occur.
  • the distance between the center of the refraction surface of the first radio wave refraction plate 32 and the center of the refraction surface of the second radio wave refraction plate 34 is the first radio wave refraction plate 32 and the second radio wave refraction plate 34. It is preferable that the distance between the transmitting antenna 12 and the first receiving antenna 14 is set to be larger than the distance between the transmitting antenna 12 and the first receiving antenna 14 .
  • the first radio wave refraction plate 32 and the second radio wave refraction plate 34 are such that the distance between the center of the refraction surface of the first radio wave refraction plate 32 and the center of the refraction surface of the second radio wave refraction plate 34 is the same as that of the second transmission antenna. 22 and the second receiving antenna 24 is preferably installed.
  • the distance between the first transmitting antenna 12 and the first receiving antenna 14 and the distance between the second transmitting antenna 22 and the second receiving antenna 24 are, for example, within 1 m.
  • the first radio wave refraction plate 32 and the second radio wave refraction plate 34 have a distance between the center of the refraction surface of the first radio wave refraction plate 32 and the center of the refraction surface of the second radio wave refraction plate 34, for example. , it is preferable to install them at intervals of 10 m or more.
  • the azimuths of the radio waves W1 transmitted by the first transmitting antenna 12 and the radio waves W2 transmitted by the second transmitting antenna 22 can be separated from the directions of the second receiving antenna 24 and the first receiving antenna 14, respectively. , radio wave interference can be further suppressed.
  • Radio communication system 10 First radio station 12 First transmitting antenna 14 First receiving antenna 20 Second radio station 22 Second transmitting antenna 24 Second receiving antenna 26 Transmitting/receiving antenna 32 First radio wave refracting plate 34 Second radio wave refracting plate 62 First radio wave reflector 64 Second radio wave reflector

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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PCT/JP2023/025286 2022-07-14 2023-07-07 無線通信システムおよび無線通信方法 Ceased WO2024014411A1 (ja)

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JP2022113310 2022-07-14

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002164735A (ja) * 2000-11-28 2002-06-07 Kobe Steel Ltd マイクロ波無線通信システムにおける無給電中継装置
JP2015231182A (ja) * 2014-06-06 2015-12-21 日本電信電話株式会社 メタマテリアル受動素子
WO2022044106A1 (ja) * 2020-08-25 2022-03-03 日本電信電話株式会社 無線通信方法及び無線通信装置
WO2022091986A1 (ja) * 2020-10-30 2022-05-05 京セラ株式会社 通信システム、通信方法、および電波屈折板の設置方法

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Publication number Priority date Publication date Assignee Title
JP5849988B2 (ja) * 2013-05-13 2016-02-03 横河電機株式会社 フィールド無線中継装置
JP5985668B2 (ja) * 2015-01-09 2016-09-06 中国電力株式会社 多重無線通信装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002164735A (ja) * 2000-11-28 2002-06-07 Kobe Steel Ltd マイクロ波無線通信システムにおける無給電中継装置
JP2015231182A (ja) * 2014-06-06 2015-12-21 日本電信電話株式会社 メタマテリアル受動素子
WO2022044106A1 (ja) * 2020-08-25 2022-03-03 日本電信電話株式会社 無線通信方法及び無線通信装置
WO2022091986A1 (ja) * 2020-10-30 2022-05-05 京セラ株式会社 通信システム、通信方法、および電波屈折板の設置方法

Non-Patent Citations (1)

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Title
"[Comprehensive feature on electronic component technology] High-tech focus Kyocera Metasurface refracting plate that changes the direction of radio waves - Towards flexible area construction for millimeter wave 5G", 8 July 2022 (2022-07-08), Retrieved from the Internet <URL:https://dempa-digital.com/article/332053> *

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