WO2024069761A1 - Système de communication sans fil, station centralisée, procédé de communication sans fil et programme de commande centralisé - Google Patents

Système de communication sans fil, station centralisée, procédé de communication sans fil et programme de commande centralisé Download PDF

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Publication number
WO2024069761A1
WO2024069761A1 PCT/JP2022/035966 JP2022035966W WO2024069761A1 WO 2024069761 A1 WO2024069761 A1 WO 2024069761A1 JP 2022035966 W JP2022035966 W JP 2022035966W WO 2024069761 A1 WO2024069761 A1 WO 2024069761A1
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WO
WIPO (PCT)
Prior art keywords
terminals
base station
terminal
unit
propagation loss
Prior art date
Application number
PCT/JP2022/035966
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English (en)
Japanese (ja)
Inventor
隼人 福園
利文 宮城
武 鬼沢
達樹 奥山
聡 須山
祥久 岸山
Original Assignee
日本電信電話株式会社
株式会社Ｎｔｔドコモ
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.)
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Publication date
Application filed by 日本電信電話株式会社, 株式会社Ｎｔｔドコモ filed Critical 日本電信電話株式会社
Priority to PCT/JP2022/035966 priority Critical patent/WO2024069761A1/fr
Publication of WO2024069761A1 publication Critical patent/WO2024069761A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data

Definitions

  • the present invention relates to a wireless communication system, a central station, a wireless communication method, and a central control program.
  • the present invention has been made in consideration of the above-mentioned problems, and aims to provide a wireless communication system, a central station, a wireless communication method, and a centralized control program that enable optimal selection of a base station to which each terminal should connect from among multiple base stations while maintaining a predetermined communication quality.
  • a wireless communication system includes a plurality of central stations that cooperate to centrally control a plurality of base stations each capable of accommodating a plurality of terminals.
  • the central station includes a selection unit that predicts traffic between each of the terminals and each of the base stations based on the relevance of each of the users using the terminals, and selects the base station to which the terminals should connect based on the traffic of each of the terminals.
  • a collection unit that continuously collects terminal location information indicating the location of each of the terminals and propagation loss information indicating the propagation loss between each of the terminals and each of the base stations.
  • a calculation unit that calculates a packet error rate for each of the base stations selected by the selection unit based on the terminal location information and propagation loss information continuously collected by the collection unit.
  • a determination unit that determines whether or not there is a terminal whose communication quality with respect to the base station is below a predetermined value based on the packet error rate calculated by the calculation unit. When the determination unit determines that there is a terminal whose communication quality with respect to the base station is below a predetermined value, a change unit that changes the base station to which the terminals connect so that the communication quality of each of the terminals connected to the base station exceeds the predetermined value.
  • a central station is a central station that centrally controls a plurality of base stations each capable of accommodating a plurality of terminals in cooperation with each other, and includes a selection unit that predicts traffic between each of the terminals and each of the base stations based on the relevance of each of the users using the terminals, and selects the base station to which the terminals should be connected based on the traffic of each of the terminals; a collection unit that continuously collects terminal location information indicating the location of each of the terminals and propagation loss information indicating the propagation loss between each of the terminals and each of the base stations; a calculation unit that calculates a packet error rate for each of the base stations selected by the selection unit based on the terminal location information and propagation loss information continuously collected by the collection unit; a determination unit that determines whether or not there is a terminal whose communication quality with respect to the base station is below a predetermined value based on the packet error rate calculated by the calculation unit; and a change unit that changes the base station to which
  • a wireless communication method is a wireless communication method in which multiple central stations cooperate to centrally control multiple base stations each capable of accommodating multiple terminals, the method comprising: a selection step of predicting traffic between each of the terminals and each of the base stations based on the relevance of each of the users using the terminals, and selecting the base station to which the terminals should be connected based on the traffic of each of the terminals; a collection step of continuously collecting terminal location information indicating the location of each of the terminals and propagation loss information indicating the propagation loss between each of the terminals and each of the base stations; a calculation step of calculating a packet error rate for each of the base stations selected by the selection step based on the terminal location information and propagation loss information continuously collected by the collection step; a determination step of determining whether or not there is a terminal whose communication quality with respect to the base station is below a predetermined value based on the packet error rate calculated by the calculation step; and a change step of changing the base station to which the terminals are
  • the present invention makes it possible to optimize and select the base station to which each terminal should connect from among multiple base stations while maintaining a specified communication quality.
  • FIG. 1 is a diagram showing an overview of a wireless communication system according to an embodiment
  • FIG. 2 is a functional block diagram illustrating functions of a terminal.
  • FIG. 2 is a functional block diagram illustrating functions of a base station.
  • FIG. 2 is a diagram illustrating an example of a hardware configuration of a central station according to an embodiment.
  • FIG. 1 is a diagram showing an overview of a wireless communication system 1 according to one embodiment.
  • the wireless communication system 1 includes multiple central stations 4 that cooperate with each other to centrally control multiple base stations 3, each capable of accommodating multiple terminals 2.
  • the terminals 2 are wireless terminals that are used by users for wireless communication.
  • the base stations 3 may be reflectors that relay radio waves.
  • the central station 4 is configured to cooperate with other central stations 4 to centrally control a plurality of base stations 3.
  • FIG. 2 is a functional block diagram illustrating the functions of the terminal 2.
  • the terminal 2 has, for example, an antenna 20, an amplifier 21, an AD converter 22, a demodulator/decoder 23, an information bit detector 24, and a position information notification unit 25.
  • the amplifier 21 amplifies the signal received via the antenna 20 and outputs it to the AD converter 22. Note that a converter that converts the frequency may be provided in front of the amplifier 21.
  • the AD conversion unit 22 is an analog-to-digital conversion unit that converts the analog signal amplified by the amplifier unit 21 into a digital signal.
  • the demodulation and decoding unit 23 demodulates the received data that has been converted into a digital signal by the AD conversion unit 22, performs error correction decoding, and outputs the data to the information bit detection unit 24.
  • the information bit detection unit 24 detects information bits from the signal input from the demodulation and decoding unit 23.
  • the location information notification unit 25 generates a notification signal for notifying the base station 3 of information (terminal location information) indicating the location of the own station (the terminal 2), and notifies the base station 3 of the generated notification signal via the antenna 20.
  • FIG. 3 is a functional block diagram illustrating the functions of the base station 3.
  • the base station 3 has, for example, an antenna 30, an information bit generation unit 31, a modulation coding unit 32, a DA conversion unit 33, a wireless conversion unit 34, a wireless conversion unit 35, an AD conversion unit 36, a demodulation and decoding unit 37, an information bit detection unit 38, a power intensity detection unit 300, an obstacle information detection unit 302, and an environmental information detection unit 304.
  • the information bit generator 31 generates information bits indicating data to be transmitted to the terminal 2, and outputs them to the modulation and coding unit 32.
  • the modulation and coding unit 32 performs error correction coding on the information bits generated by the information bit generation unit 31, digitally modulates them into a data signal, and outputs the data signal to the DA conversion unit 33.
  • the DA conversion unit 33 converts the data signal digitally modulated by the modulation and coding unit 32 into an analog signal and outputs it to the wireless conversion unit 34.
  • the wireless conversion unit 34 converts the analog signal converted by the DA conversion unit 33 into a specified wireless signal and transmits it via the antenna 30.
  • the wireless conversion unit 35 converts the wireless signal received via the antenna 30 into an analog signal of a specific frequency and outputs it to the AD conversion unit 36.
  • the AD conversion unit 36 is an analog-to-digital conversion unit that converts the analog signal converted by the wireless conversion unit 35 into a digital signal.
  • the demodulation and decoding unit 37 demodulates the received data that has been converted into a digital signal by the AD conversion unit 36, performs error correction decoding, and outputs the data to the information bit detection unit 38.
  • the information bit detection unit 38 detects information bits from the signal input from the demodulation and decoding unit 37.
  • the power intensity detection unit 300 detects the power intensity of the signal received from each terminal 2 via the antenna 30, and notifies the central station 4. For example, the power intensity detection unit 300 detects the gain of each multipath for each delay time.
  • the power intensity detection unit 300 may also have a function of detecting the distance to the terminal 2, the propagation loss between the terminal 2, etc.
  • the obstacle information detection unit 302 is an image sensor such as a CMOS sensor that detects obstacles that affect communication with the terminal 2, and performs processing to notify the central station 4 of information indicating the detected obstacle. For example, the obstacle information detection unit 302 captures an image of an object located between each terminal 2.
  • the environmental information detection unit 304 detects the surrounding environment that may affect communication with the terminal 2, and notifies the central station 4 of the environmental information indicating the detected surrounding environment.
  • the base station 3 is configured to have the function of transmitting to the central station 4, for example, the wireless quality status between the terminal 2 (propagation loss, fading environment, shadowing) and terminal location information indicating the location of the terminal 2 notified from the terminal 2.
  • FIG. 4 is a functional block diagram illustrating the functions of the central station 4. Note that the central station 4 is configured to have a function for linking with other central stations 4, so the other central stations 4 are also shown in a simplified form in FIG. 4.
  • the central station 4 has, for example, a collection unit 40, a big data processing unit 42, a collaboration unit 44, a selection unit 46, and a change unit 48.
  • the collection unit 40 has, for example, a location information collection unit 402, a power intensity collection unit 404, an obstacle information collection unit 406, and an environmental information collection unit 408, and continuously collects terminal location information indicating the location of each terminal 2, and propagation loss information indicating the propagation loss between each terminal 2 and each base station 3, and outputs it to the big data processing unit 42.
  • the location information collection unit 402 collects terminal location information indicating the location of each terminal 2 transmitted from the base station 3, and outputs the information to the big data processing unit 42.
  • the power intensity collection unit 404 collects power information indicating the intensity of the received power from each terminal 2 transmitted from the base station 3, and outputs it to the big data processing unit 42.
  • the obstacle information collection unit 406 collects information indicating obstacles that affect communication with the terminal 2 sent from the base station 3, and outputs the information to the big data processing unit 42.
  • the environmental information collection unit 408 collects environmental information indicating the surrounding environment that affects communication with the terminal 2 and is sent from the base station 3, and outputs the information to the big data processing unit 42.
  • the collection unit 40 has the function of collecting terminal position information and propagation loss information calculated based on the power intensity detected by the power intensity detection unit 300 of the base station 3 and the object photographed by the obstacle information detection unit 302.
  • the big data processing unit 42 generates a collection of big data of the CPS described above, and also has a calculation unit 420 and a determination unit 422, and performs processing to control the collaboration unit 44 and the change unit 48.
  • the calculation unit 420 calculates the packet error rate of each base station 3 once selected by the selection unit 46, as described below, based on, for example, the terminal position information and propagation loss information continuously collected by the collection unit 40, and outputs the packet error rate to the determination unit 422.
  • the determination unit 422 determines whether there is a terminal 2 whose communication quality with the base station 3 falls below a predetermined value based on the packet error rate calculated by the calculation unit 420.
  • the collaboration unit 44 collaborates with other central stations 4 to share the results of processing by the big data processing unit 42 with the other central stations 4 and output the results to the selection unit 46.
  • the selection unit 46 performs a process of selecting a base station 3 to which the terminal 2 should connect based on the results of processing by the big data processing unit 42, and outputs the processing result to the change unit 48. For example, the selection unit 46 predicts the traffic between each terminal 2 and each base station 3 based on the relevance of each user who uses the terminal 2, and selects a base station 3 to which the terminal 2 should connect based on the traffic of each terminal 2.
  • the change unit 48 controls the base station 3 to change the base station 3 to which the terminal 2 is connected so that the communication quality of each terminal 2 connecting to the base station 3 exceeds the predetermined value.
  • the central station 4 is configured to generate a collection of big data using terminal location information indicating the location of each terminal collected via the base station 3, and actual data related to propagation loss (distance between the terminal 2 and the base station 3, shadowing due to obstacles, etc.), and to use this data together with the CPS big data described above to accurately select the base station 3 to which the terminal 2 should connect.
  • FIG. 5 is a flowchart showing an example of the operation of the central station 4. As shown in FIG. 5, for example, the central station 4 first collects actual data related to terminal position information and propagation loss for each terminal 2 (S100).
  • the central station 4 calculates the wireless packet error rate for the selected base station using the CPS big data (S102).
  • the central station 4 checks whether there is a terminal 2 for which the traffic volume for each packet error rate has decreased and fallen below the required predetermined communication quality (S104).
  • the central station 4 determines whether all terminals satisfy the required predetermined communication quality (S106), and if all terminals satisfy the communication quality (S106: Yes), ends the process, otherwise (S106: No), proceeds to the process of S108.
  • the central station 4 performs a process to change the connected base station of each terminal 2, and returns to the process of S102.
  • the wireless communication system 1 continuously collects terminal position information of each terminal 2 and propagation loss information indicating the propagation loss between each terminal 2 and each base station 3, and when there is a terminal 2 whose communication quality with respect to a base station 3 falls below a predetermined value, changes the base station 3 to which the terminal 2 is connected so that the communication quality exceeds the predetermined value, thereby making it possible to optimize and select the base station 3 to which each terminal 2 should connect from among multiple base stations 3 while maintaining a predetermined communication quality.
  • each function possessed by the terminal 2, base station 3, and central station 4 may be configured in whole or in part by hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array), or may be configured as a program executed by a processor such as a CPU.
  • hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array)
  • the central station 4 can be realized using a computer and a program, and the program can be recorded on a storage medium or provided via a network.
  • FIG. 6 is a diagram showing an example of the hardware configuration of a central station 4 according to one embodiment.
  • the central station 4 has an input unit 50, an output unit 51, a communication unit 52, a CPU 53, a memory 54, and a HDD 55 connected via a bus 56, and functions as a computer.
  • the central station 4 is also capable of inputting and outputting data to and from a computer-readable storage medium 57.
  • the input unit 50 is, for example, a keyboard and a mouse.
  • the output unit 51 is, for example, a display device such as a display.
  • the input unit 50 and the output unit 51 may also be a touch panel, etc.
  • the communication unit 52 is, for example, a communication interface that performs wireless communication.
  • the CPU 53 controls each component of the central station 4 and performs predetermined processing.
  • the memory 54 and HDD 55 store data, etc.
  • the storage medium 57 is capable of storing programs and the like that execute the functions of the central station 4. Note that the architecture that constitutes the central station 4 is not limited to the example shown in FIG. 6.
  • 1...wireless communication system 2...terminal, 3...base station, 4...central station, 20...antenna, 21...amplifier, 22...AD converter, 23...demodulation and decoding unit, 24...information bit detector, 25...location information notification unit, 30...antenna, 31...information bit generator, 32...modulation and coding unit, 33...DA converter, 34...wireless converter, 35...wireless converter, 36...AD converter, 37...demodulation and decoding unit, 38...information bit detector, 40...collection unit, 42...bit data processing unit, 44... linking unit, 46... selection unit, 48... change unit, 50... input unit, 51... output unit, 52... communication unit, 53... CPU, 54... memory, 55... HDD, 56... bus, 57... storage medium, 300...
  • power intensity detection unit 302... obstacle information detection unit, 304... environmental information detection unit, 402... position information collection unit, 404... power intensity collection unit, 406... obstacle information collection unit, 408... environmental information collection unit, 420... calculation unit, 422... determination unit

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

Abstract

Un système de communication sans fil selon un mode de réalisation de la présente invention prédit, sur la base d'un degré de pertinence de chaque utilisateur qui utilise un terminal, un trafic entre chaque terminal et chaque station de base, sélectionne une station de base pour se connecter sur la base du trafic de chaque terminal, collecte en continu les informations de position de terminal relatives à chaque terminal et des informations de perte de propagation entre chaque terminal et chaque station de base, calcule un taux d'erreur par paquet de chaque station de base sélectionnée sur la base des informations de position de terminal et des informations de perte de propagation collectées, détermine, sur la base des taux d'erreur par paquet calculés, s'il existe ou non un terminal ayant une qualité de communication avec la station de base qui est inférieure à une valeur prédéterminée, et lorsqu'il est déterminé qu'il existe un terminal ayant la qualité de communication inférieure à la valeur prédéterminée, change la station de base à laquelle le terminal est connecté de telle sorte que la qualité de communication de la connexion de chaque terminal à la station de base dépasse la valeur prédéterminée.
PCT/JP2022/035966 2022-09-27 2022-09-27 Système de communication sans fil, station centralisée, procédé de communication sans fil et programme de commande centralisé WO2024069761A1 (fr)

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PCT/JP2022/035966 WO2024069761A1 (fr) 2022-09-27 2022-09-27 Système de communication sans fil, station centralisée, procédé de communication sans fil et programme de commande centralisé

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006333529A (ja) * 2006-09-04 2006-12-07 Ntt Docomo Inc 移動局、基地局、通信システム及び通信方法
JP2009257763A (ja) * 2006-06-30 2009-11-05 Nec Corp 車輌用位置推定装置、車輌用位置推定方法、および車輌用位置推定プログラム
JP2015027010A (ja) * 2013-07-29 2015-02-05 ソニー株式会社 無線通信装置及び無線通信方法
JP2015109509A (ja) * 2013-12-03 2015-06-11 国立大学法人東北大学 無線通信システムおよび無線通信方法
WO2017130317A1 (fr) * 2016-01-27 2017-08-03 三菱電機株式会社 Dispositif de surveillance, système de radiocommunication et procédé de surveillance de la qualité de communication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009257763A (ja) * 2006-06-30 2009-11-05 Nec Corp 車輌用位置推定装置、車輌用位置推定方法、および車輌用位置推定プログラム
JP2006333529A (ja) * 2006-09-04 2006-12-07 Ntt Docomo Inc 移動局、基地局、通信システム及び通信方法
JP2015027010A (ja) * 2013-07-29 2015-02-05 ソニー株式会社 無線通信装置及び無線通信方法
JP2015109509A (ja) * 2013-12-03 2015-06-11 国立大学法人東北大学 無線通信システムおよび無線通信方法
WO2017130317A1 (fr) * 2016-01-27 2017-08-03 三菱電機株式会社 Dispositif de surveillance, système de radiocommunication et procédé de surveillance de la qualité de communication

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