WO2023089806A1 - Système de mesure de signal sans fil, procédé de mesure de signal sans fil, et dispositif de commande - Google Patents

Système de mesure de signal sans fil, procédé de mesure de signal sans fil, et dispositif de commande Download PDF

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Publication number
WO2023089806A1
WO2023089806A1 PCT/JP2021/042729 JP2021042729W WO2023089806A1 WO 2023089806 A1 WO2023089806 A1 WO 2023089806A1 JP 2021042729 W JP2021042729 W JP 2021042729W WO 2023089806 A1 WO2023089806 A1 WO 2023089806A1
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WO
WIPO (PCT)
Prior art keywords
wireless communication
wireless
communication system
measurement
signal measurement
Prior art date
Application number
PCT/JP2021/042729
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English (en)
Japanese (ja)
Inventor
笑子 篠原
裕介 淺井
泰司 鷹取
純一 岩谷
芳孝 清水
知之 山田
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日本電信電話株式会社
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Publication date
Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to PCT/JP2021/042729 priority Critical patent/WO2023089806A1/fr
Priority to JP2023562079A priority patent/JPWO2023089806A1/ja
Publication of WO2023089806A1 publication Critical patent/WO2023089806A1/fr

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    • 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
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to technology for measuring interference conditions of channels used in wireless communication systems.
  • wireless signals of various standards coexist in the same frequency band.
  • it is effective to select and use a channel with less interference to improve throughput and communication capacity. Since the interference situation is not constant, it is preferable to properly grasp the interference situation and reselect the channel.
  • Non-Patent Document 1 discloses a beacon signal transmitted by a wireless LAN access point.
  • the radio signals of the own system can be distinguished from other radio signals. As a result, it is possible to check the usage status of the channels used in the own system.
  • One object of the present invention is to provide a technology capable of accurately measuring the interference situation of channels used in a wireless communication system.
  • a first aspect relates to wireless signal measurement systems.
  • a wireless signal measurement system includes a measurement device and a control device.
  • a measuring device measures the interference state of a channel used in a wireless communication system.
  • the control device controls the wireless communication system so as to stop signal transmission at least during the measurement period during which the measurement device measures the interference situation.
  • a second aspect relates to the radio signal measurement method.
  • the wireless signal measurement method is A process of measuring interference conditions of channels used in a wireless communication system; and a process of controlling the wireless communication system to stop signal transmission at least during the measurement period during which the interference situation is measured.
  • a third aspect relates to a control device that controls a radio signal measurement system that measures interference conditions of channels used in a radio communication system.
  • the controller is configured to control the wireless communication system to stop signal transmission at least during the measurement period during which the interference situation is measured.
  • the wireless communication system to be measured when the interference condition of the channel used in the wireless communication system is measured, the wireless communication system to be measured is controlled to stop signal transmission. In other words, the interference situation is measured while the wireless communication system to be measured stops signal transmission. Therefore, it is possible to prevent the radio signal of the radio communication system to be measured from interfering with the measurement of the interference state. As a result, it is possible to more accurately measure (recognize) the interference situation that changes over time. Moreover, even if the radio communication system to be measured is in operation, it is possible to accurately measure the interference state of the channel.
  • FIG. 1 is a schematic diagram showing a configuration example of a radio communication system according to an embodiment
  • FIG. 1 is a block diagram showing a configuration example of a radio signal measurement system according to an embodiment
  • FIG. It is a block diagram showing another configuration example of the radio signal measurement system according to the embodiment.
  • 4 is a conceptual diagram for explaining radio signal measurement processing by the radio signal measurement system according to the embodiment
  • FIG. FIG. 2 is a conceptual diagram for explaining a first example of radio signal measurement processing according to an embodiment
  • 6 is a flowchart showing a first example of radio signal measurement processing according to the embodiment
  • 6 is a flowchart showing a first example of radio signal measurement processing according to the embodiment
  • FIG. 7 is a conceptual diagram for explaining a second example of radio signal measurement processing according to the embodiment
  • 9 is a flowchart showing a second example of radio signal measurement processing according to the embodiment;
  • FIG. 1 is a schematic diagram showing a configuration example of a radio communication system 1 according to the present embodiment.
  • a radio communication system 1 includes a plurality of radio communication devices 10 forming a radio communication network.
  • the radio communication system 1 includes radio communication devices 10-1 to 10-4.
  • the plurality of wireless communication devices 10 include a base station (master device) and one or more wireless terminals (child devices).
  • a base station and one or more wireless terminals configure a wireless communication network and perform wireless communication with each other.
  • the wireless communication system 1 is a wireless LAN (Local Area Network) system.
  • the base station is a wireless LAN access point.
  • wireless communication device 10-1 is a wireless LAN access point (AP).
  • Wireless communication devices 10-2 to 10-4 are wireless terminals (STAs) that communicate with access points.
  • a cell composed of an access point and one or more wireless terminals is called a BSS (Basic Service Set).
  • FIG. 2 is a block diagram showing a configuration example of the radio signal measurement system 100 according to the present embodiment.
  • the radio signal measurement system 100 measures the interference state of channels used in the radio communication system 1 by measuring radio signals.
  • a wireless signal measurement system 100 includes a wireless communication device 10 , a measurement device 20 and a control device 30 .
  • a wireless communication device 10 is included in a wireless communication system 1 to be measured.
  • the measuring device 20 measures the interference state of the channel used in the wireless communication system 1 by measuring the wireless signal.
  • measurement device 20 includes a spectrum analyzer.
  • measurement device 20 may comprise a wireless interface, wireless software, and a processor that executes the wireless software.
  • This measuring device 20 can measure a radio signal without depending on the radio signal standard.
  • the measuring device 20 scans the frequency bands of the channels used in the wireless communication system 1 to be measured and the peripheral channels. Note that the measurement device 20 may be included in the wireless communication device 10 .
  • the control device 30 controls the radio signal measurement system 100 . That is, the control device 30 controls the wireless communication device 10 and the measuring device 20 . Note that the control device 30 may be a control device included in the wireless communication device 10 . As shown in FIG. 3 , wireless communication device 10 may include measurement device 20 and control device 30 .
  • the control device 30 may be a computer including one or more processors 31 (hereinafter simply referred to as “processors 31") and one or more storage devices 32 (hereinafter simply referred to as “storage devices 32").
  • processors 31 include a CPU (Central Processing Unit).
  • storage devices 32 stores various information necessary for processing by the processor 31 . Examples of the storage device 32 include volatile memory, nonvolatile memory, HDD (Hard Disk Drive), SSD (Solid State Drive), and the like.
  • the program 33 is a computer program executed by the processor 31.
  • the functions of the control device 30 are implemented by the processor 31 executing the program 33 .
  • a program 33 is stored in the storage device 32 .
  • the program 33 may be recorded on a computer-readable recording medium.
  • Program 33 may be provided to control device 30 via a network.
  • the measurement device 20 measures the interference state of the channel used in the radio communication system 1 by measuring radio signals. At this time, the measuring device 20 scans the frequency bands of the channels used in the wireless communication system 1 to be measured and the peripheral channels. However, while the radio communication system 1 to be measured is using the channel, it is difficult to determine whether the radio signal measured by scanning is the radio signal of the radio communication system 1 itself or an interference signal. . This causes a decrease in recognition accuracy of the interference situation. Therefore, the radio signal measurement system 100 according to the present embodiment executes radio signal measurement processing as follows.
  • FIG. 4 is a conceptual diagram for explaining radio signal measurement processing by the radio signal measurement system 100 according to the present embodiment.
  • the measurement period PM is a period during which the measurement device 20 measures the interference state of the channel used in the wireless communication system 1 .
  • the controller 30 controls the radio communication system 1 to stop signal transmission at least during the measurement period PM. That is, the control device 30 stops signal transmission in the wireless communication system 1 in conjunction with measurement by the measurement device 20 .
  • control device 30 causes the wireless communication system 1 to stop signal transmission by controlling the wireless communication device 10 included in the wireless communication system 1 to be measured. That is, the control device 30 controls the radio communication device 10 included in the radio communication system 1 so that the radio communication system 1 stops signal transmission at least during the measurement period PM.
  • the transmission prohibited period PX is a period during which signal transmission in the wireless communication system 1 is prohibited.
  • the transmission prohibited period PX is set to include the measurement period PM.
  • Each wireless communication device 10 included in the wireless communication system 1 suspends signal transmission during the transmission prohibited period PX.
  • the control device 30 controls the measurement device 20 to perform measurement during the transmission prohibited period PX.
  • the wireless communication system 1 to be measured when the interference state of the channel used in the wireless communication system 1 is measured, the wireless communication system 1 to be measured is controlled to stop signal transmission. In other words, the interference situation is measured while the radio communication system 1 to be measured stops signal transmission. Therefore, the wireless signal of the wireless communication system 1 itself to be measured is prevented from interfering with the measurement of the interference state. As a result, it is possible to more accurately measure (recognize) the interference situation that changes over time. Further, according to the present embodiment, even if the wireless communication system 1 to be measured is in an operating state, it is possible to accurately measure the interference state of the channel.
  • radio signal measurement processing by the radio signal measurement system 100 will be described below.
  • the wireless communication system 1 is a wireless LAN system (see FIG. 1).
  • the RTS (Request To Send)/CTS (Clear To Send) scheme is known as a technique for efficiently avoiding collisions.
  • a wireless terminal (STA) transmits an RTS frame, which is a transmission request, to an access point (AP) before data transmission.
  • the RTS frame contains information on the length of data to be transmitted.
  • An access point that receives the RTS frame returns a CTS frame to the requesting wireless terminal.
  • a CTS frame transmitted by an access point is received not only by the requesting wireless terminal, but also by other wireless terminals in the network.
  • the CTS frame contains information on the channel occupancy period (Network Allocation Vector, NAV).
  • NAV Network Allocation Vector
  • FIG. 5 is a conceptual diagram for explaining a first example of radio signal measurement processing.
  • the CTS frame described above is used.
  • the channel occupied period indicated by the CTS frame corresponds to the transmission prohibited period PX.
  • the wireless communication device 10 (access point) included in the wireless communication system 1 transmits the CTS frame, the wireless communication system 1 can set the transmission prohibited period PX.
  • the transmission prohibited period PX is 37 msec at maximum.
  • the control device 30 determines the timing for the measurement device 20 to measure the channel interference situation.
  • the control device 30 controls the wireless communication device 10 and the measurement device 20 to cooperate based on the determined measurement timing.
  • the wireless communication device 10 and the measurement device 20 operate as follows under the control of the control device 30 .
  • FIG. 6 is a flowchart showing a first example of radio signal measurement processing.
  • the wireless communication device 10 is a wireless LAN access point (AP).
  • AP wireless LAN access point
  • the wireless communication device 10 empties the transmission queue near the measurement timing (step S110). Moreover, the measuring device 20 completes the parameter setting by the measurement timing (step S111).
  • the maximum value of the transmission prohibited period PX (channel occupied period) is approximately 37 msec. Since it is necessary to secure a margin of 1 msec or more before the start of scanning, the measurement period PM (scanning period) is set to 35 msec or less.
  • step S112A the wireless communication device 10 (access point) transmits a "CTS-to-self frame".
  • a CTS-to-self frame is a CTS frame for the access point itself.
  • a CTS-to-self frame transmitted from the access point is received by each wireless communication device 10 in the wireless communication system 1 . Therefore, it is possible to set the transmission prohibited period PX for each wireless communication device 10 in the wireless communication system 1 .
  • the measuring device 20 After step S112A, the measuring device 20 starts scanning after the amplitude of the random access time (approximately 1 msec) (step S113). The measuring device 20 scans the frequency bands of the channels and peripheral channels used in the wireless communication system 1 to be measured (step S114). The measuring device 20 then completes the scan (step S115).
  • step S115 the wireless communication device 10 performs normal data transmission (step S116).
  • FIG. 7 shows a processing flow when the wireless communication device 10 is a wireless terminal (STA).
  • STA wireless terminal
  • step S112B the wireless communication apparatus 10 (STA) transmits the RTS frame to the access point, thereby causing the access point to transmit the CTS frame.
  • a CTS frame transmitted from an access point is received by each wireless communication device 10 in the wireless communication system 1 . Therefore, it is possible to set the transmission prohibited period PX for each wireless communication device 10 in the wireless communication system 1 .
  • FIG. 8 is a conceptual diagram for explaining a second example of the radio signal measurement processing according to this embodiment.
  • a "notification frame" specifying a transmission prohibited period PX including a measurement period PM is used.
  • the wireless communication device 10 transmits the notification frame to other wireless communication devices 10 included in the wireless communication system 1 in advance. This enables each wireless communication device 10 included in the wireless communication system 1 to grasp the transmission prohibited period PX in advance.
  • Each wireless communication device 10 stops signal transmission during the transmission prohibited period PX specified in the notification frame.
  • the control device 30 determines the timing for the measurement device 20 to measure the channel interference situation.
  • the control device 30 sets the transmission prohibited period PX so as to include the measurement period PM. If accurate time synchronization is possible between the wireless communication devices 10 included in the wireless communication system 1, the transmission prohibited period PX may be set in absolute time. If precise time synchronization is not possible, well-known time timing such as TBTT (Target Beacon Transmit Time) is used.
  • the control device 30 controls the wireless communication device 10 and the measuring device 20 to cooperate based on the set transmission prohibition period PX.
  • the wireless communication device 10 and the measurement device 20 operate as follows under the control of the control device 30 .
  • FIG. 9 is a flowchart showing a second example of radio signal measurement processing.
  • step S ⁇ b>120 the wireless communication device 10 transmits in advance a notification frame designating the transmission prohibited period PX to other wireless communication devices 10 included in the wireless communication system 1 . This enables each wireless communication device 10 included in the wireless communication system 1 to grasp the transmission prohibited period PX in advance.
  • the measurement device 20 completes parameter setting by the measurement timing (step S121).
  • each wireless communication device 10 included in the wireless communication system 1 stops signal transmission (step S122). That is, each wireless communication device 10 stops signal transmission during the transmission prohibited period PX specified in the notification frame.
  • the measuring device 20 After step S122, the measuring device 20 starts scanning after the amplitude of time synchronization (about 10 msec) (step S123). The measuring device 20 scans the frequency bands of the channels used in the wireless communication system 1 to be measured and the peripheral channels (step S124). The measuring device 20 then completes the scan (step S125).
  • step S125 the wireless communication device 10 performs normal data transmission (step S126).
  • the wireless communication system 1 to be measured is controlled to stop signal transmission.
  • the interference situation is measured while the radio communication system 1 to be measured stops signal transmission. Therefore, the wireless signal of the wireless communication system 1 itself to be measured is prevented from interfering with the measurement of the interference state.
  • even if the wireless communication system 1 to be measured is in an operating state it is possible to accurately measure the interference state of the channel.
  • wireless communication system 10 wireless communication device 20 measuring device 30 control device 31 processor 32 storage device 33 program 100 wireless signal measuring system

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un système de mesure de signal sans fil mesure l'état d'interférence d'un canal utilisé dans un système de communication sans fil. Plus particulièrement, le système de mesure de signal sans fil comporte un dispositif de mesure et un dispositif de commande. Le dispositif de mesure mesure l'état d'interférence d'un canal utilisé dans le système de communication sans fil. Au moins dans la période de mesure au cours de laquelle le dispositif de mesure mesure l'état d'interférence, le dispositif de commande commande l'arrêt de la transmission de signal par le système de communication sans fil.
PCT/JP2021/042729 2021-11-22 2021-11-22 Système de mesure de signal sans fil, procédé de mesure de signal sans fil, et dispositif de commande WO2023089806A1 (fr)

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PCT/JP2021/042729 WO2023089806A1 (fr) 2021-11-22 2021-11-22 Système de mesure de signal sans fil, procédé de mesure de signal sans fil, et dispositif de commande
JP2023562079A JPWO2023089806A1 (fr) 2021-11-22 2021-11-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005094672A (ja) * 2003-09-19 2005-04-07 Toshiba Corp マルチキャリア通信方法、マルチキャリア通信システムおよびこのシステムで用いられる通信装置
WO2011018927A1 (fr) * 2009-08-10 2011-02-17 三菱電機株式会社 Système de communication radio, dispositif de communication radio et procédé de communication radio
JP2011239480A (ja) * 2011-09-01 2011-11-24 Mitsubishi Electric Corp 干渉制御方法、制御装置および基地局装置
JP2016510580A (ja) * 2013-02-14 2016-04-07 クアルコム，インコーポレイテッド 受信機測定支援アクセスポイント制御
WO2021106078A1 (fr) * 2019-11-26 2021-06-03 日本電信電話株式会社 Système de réseau local sans fil, dispositif de gestion de signal de commande d'interférences, dispositif de station de base et procédé de commande d'interférences

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005094672A (ja) * 2003-09-19 2005-04-07 Toshiba Corp マルチキャリア通信方法、マルチキャリア通信システムおよびこのシステムで用いられる通信装置
WO2011018927A1 (fr) * 2009-08-10 2011-02-17 三菱電機株式会社 Système de communication radio, dispositif de communication radio et procédé de communication radio
JP2011239480A (ja) * 2011-09-01 2011-11-24 Mitsubishi Electric Corp 干渉制御方法、制御装置および基地局装置
JP2016510580A (ja) * 2013-02-14 2016-04-07 クアルコム，インコーポレイテッド 受信機測定支援アクセスポイント制御
WO2021106078A1 (fr) * 2019-11-26 2021-06-03 日本電信電話株式会社 Système de réseau local sans fil, dispositif de gestion de signal de commande d'interférences, dispositif de station de base et procédé de commande d'interférences

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