WO2023058187A1 - Système de commande, procédé de commande, dispositif de commande, et programme - Google Patents

Système de commande, procédé de commande, dispositif de commande, et programme Download PDF

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Publication number
WO2023058187A1
WO2023058187A1 PCT/JP2021/037127 JP2021037127W WO2023058187A1 WO 2023058187 A1 WO2023058187 A1 WO 2023058187A1 JP 2021037127 W JP2021037127 W JP 2021037127W WO 2023058187 A1 WO2023058187 A1 WO 2023058187A1
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Prior art keywords
transmission
amount
accumulated amount
controller
terminal
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PCT/JP2021/037127
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English (en)
Japanese (ja)
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裕希 坂上
友宏 谷口
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日本電信電話株式会社
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Priority to PCT/JP2021/037127 priority Critical patent/WO2023058187A1/fr
Priority to JP2023552627A priority patent/JPWO2023058187A1/ja
Publication of WO2023058187A1 publication Critical patent/WO2023058187A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling

Definitions

  • This disclosure relates to quality control technology in a network (NW).
  • the end-end of the network can be divided into wireless and wired sections.
  • wireless section there is a priority control function called IEEE802.11 Enhanced Distributed Channel Access (EDCA) as an existing technology (Non-Patent Documents 1 and 2).
  • EDCA Enhanced Distributed Channel Access
  • EDCA is a control for each terminal (destination), and it is difficult to control for each traffic flow that enables quality control for each service and application. , quality control on a service and application basis can be achieved.
  • Non-Patent Document 3 when the control signal communication for quality control is wireless, the packet accumulation amount notification from the terminal or access point to the controller sent by the control signal is not reached, data transmission scheduling is performed based on an inaccurate packet accumulation amount.
  • the present disclosure provides a control system that can reduce the inaccuracy of the accumulated packet amount due to non-delivery of the accumulated packet amount notification when control signal communication for quality control is wireless.
  • the object is to provide a method, a controller, and a program.
  • the present disclosure calculates transmission time and transmission amount of packets for each traffic flow based on the latest accumulation amount and the past accumulation amount of transmission packets accumulated in the respective buffers of the terminal and the access point. I decided to control.
  • control system for controlling traffic in a wireless network, comprising: a terminal and an access point that mutually transmit packets over the wireless network; a controller that performs transmission control over the terminal and the access point via a wireless network; and each of the terminal and the access point, a buffer for accumulating transmission packets for each traffic flow; transmitting the accumulated amount of the transmission packets for each traffic flow accumulated in the buffer to the controller in a first cycle, and transmitting the transmission time and the transmission amount of the transmission packets for each traffic flow from the controller in a second cycle; a device-side transceiver for receiving; a main signal transmission unit configured to transmit the transmission packet for each traffic flow in the buffer according to the transmission time and the transmission amount to the wireless network connecting the terminal and the access point; with The controller is Control-side transmission/reception for receiving the accumulated amount from each of the terminal and the access point in the first period, and transmitting the transmission time and the transmission amount to each of the terminal and the access point in the second period
  • control method includes: A control method for controlling traffic in a wireless network, comprising: The control method is transmission control performed by a controller via a wireless network for terminals and access points that mutually transmit packets via the wireless network, accumulating transmission packets for each traffic flow in respective buffers of the terminal and the access point; transmitting the accumulated amount of the transmission packets for each traffic flow accumulated in each of the buffers to the controller at a first period; recording, in the controller, the latest accumulated amount and the past accumulated amount received from each of the terminal and the access point in the first period; Every second cycle, the controller estimates the current accumulated amount based on the recorded latest accumulated amount and the past accumulated amount, and traffic flow based on the estimated current accumulated amount Determining the transmission time and transmission amount of the transmission packet every transmitting the transmission time and the transmission amount from the controller to the terminal and the access point, respectively; and for each traffic flow from the buffers of the terminal and the access point, respectively, according to the transmission time and the transmission amount.
  • the controller is a device that performs transmission control via a wireless network for terminals and access points that mutually transmit packets via the wireless network, receiving, at a first period, the amount of transmission packets accumulated for each traffic flow in the respective buffers of the terminal and the access point, and transmitting the transmission packets for each traffic flow to each of the terminal and the access point; a control-side transmitting/receiving unit that transmits the time and transmission amount in a second period; a database unit that records the latest accumulated amount received by the control-side transmitting/receiving unit, and the past accumulated amount that was used to determine the past transmission time and the transmission amount; estimating the current accumulated amount based on the latest accumulated amount and the past accumulated amount recorded in the database unit every second cycle, and traffic flow based on the estimated current accumulated amount a scheduling unit that determines the transmission time and the transmission amount of the transmission packet for each Prepare.
  • the program according to the present disclosure is A program for causing a computer to function as the controller.
  • control signal communication for quality control is wireless
  • a control system, control method, controller, and program that can reduce inaccuracy in packet accumulation amount due to non-delivery of packet accumulation amount notification can be provided.
  • FIG. 1 is a diagram illustrating a conventional control system 300.
  • Control system 300 is a control system that controls traffic on wireless network 15, a terminal 11 and an access point 12 that mutually transmit packets via a wireless network 15; a controller 13 that controls transmission via a wireless network 16 to the terminal 11 and the access point 12; and The controller 13 determines the transmission time and amount of transmission packets for each traffic flow based on at least the accumulated amount of transmission packets for each traffic flow notified from the terminal 11, and notifies the terminal 11 and the access point 12 of these. .
  • the control system 300 as shown in FIG. As with the main signal communication between the access points 12, the restriction of wired cables is eliminated, and the applicable situations are increased. On the other hand, when the control signal communication is made wireless, the occurrence of packet loss due to external factors, such as loss of packet accumulation amount notification, increases more than in the case of wired communication.
  • FIG. 2 and 3 An example of a case where packet loss occurs in the control system 300 will be explained using FIGS. 2 and 3.
  • FIG. 2 and 3 buffer #M with buffer number #M among buffers possessed by terminal 11#N, buffer #K with buffer number #K among buffers possessed by access point 12, will be used to explain.
  • the terminal 11#N notifies the controller 13 of the accumulated amount of transmission packets accumulated in the buffer #M at a constant period t, and the controller 13 sends the transmission time at a period 5t. and an example of scheduling the transmission time.
  • the accumulated amount of transmission packets accumulated in the buffer #M refers to the amount of packets accumulated in the queue of the buffer #M.
  • the transmission packets accumulated in the buffer #M of the terminal 11#N are 0 packets at the time of the first notification, 1 packet at the time of the second notification, 3 packets at the time of the third notification, and Assume that there are 4 packets at the time of notification and 5 packets at the time of the fifth notification.
  • the controller 13 performs scheduling based on the last notified amount of accumulated transmission packets before performing scheduling.
  • FIG. 2 shows a case where all notifications from the terminal 11#N have reached the controller 13.
  • the controller 13 schedules the transmission time and transmission time for a total of 5 packets based on the latest accumulated amount notified by the fifth notification, and notifies the terminal 11#N of the scheduling.
  • the terminal 11#N transmits the five packets accumulated in the buffer #M to the access point 12 according to the notified schedule.
  • the controller 13 can know the accumulated amount of transmission packets accumulated in the terminal 11 at regular intervals T, and the latest accumulated amount Scheduling can be performed appropriately based on
  • FIG. 3 shows a case where packet loss occurs in the fifth notification in FIG.
  • the terminal 11#N notifies the controller 13 only up to the fourth time until the controller 13 performs scheduling. Therefore, the controller 13 performs scheduling with the past accumulated amount notified by the fourth notification as the latest accumulated amount. In other words, the controller 13 cannot know the latest accumulated amount due to non-delivery of the notification of the accumulated amount of transmission packets from the terminal 11 and the access point 12 to the controller 13 . As a result, scheduling is performed based on an incorrect accumulated amount of transmission packets, and there is a risk that appropriate scheduling will not be performed.
  • each terminal (11) and access point (12) notify the controller (13) of the amount of accumulated packets at regular intervals t.
  • the controller records the received latest accumulated amount of packets in the database section.
  • the database unit of the controller stores the amount of accumulated packets for the past n times used in the past scheduling.
  • the controller performs scheduling based on the latest stored packet recorded in the database unit and the amount of accumulated packets for the past n times. It is assumed that the controller notifies each terminal and access point of the schedule at regular intervals Tc.
  • Each terminal and access point executes packet transmission from the flow unit buffer unit according to the received schedule.
  • the reason why scheduling is performed based on the amount of accumulated packets from the latest to the past n times is that even if a packet loss occurs in notification of the amount of accumulated packets, the amount of accumulated packets used in the schedule for the past n This is because by estimating the amount, the divergence from the actual accumulated packet amount can be reduced.
  • FIG. 4 is a diagram illustrating the control system 301 of this embodiment.
  • the control system 301 connects each terminal 11 and the access point 12 to the controller 13, accumulating packets in buffers (FB1, FB2) for each traffic flow in each terminal 11 and access point 12, or buffers in applications; Notifying the controller 13 of the accumulated packet amount in advance; Determining the transmission time and transmission amount for each traffic in the scheduling unit SCH3 of the controller 13; The controller 13 notifies each terminal 11 and access point 12 of transmission time and transmission amount, and each terminal 11 and access point 12 transmits packets according to the notified transmission time and transmission amount. It is assumed that the time of each terminal 11, access point 12, and controller 13 is synchronized using NTP (Network Time Protocol), PTP (Precision Time Protocol), or the like.
  • NTP Network Time Protocol
  • PTP Precision Time Protocol
  • control system 301 is a control system that controls the traffic of the wireless network 15, a terminal 11 and an access point 12 that mutually transmit packets via a wireless network 15; a controller 13 that controls transmission via a wireless network 16 to the terminal 11 and the access point 12; and Each of the terminal 11 and the access point 12, buffers (FB1, FB2) for accumulating transmission packets for each traffic flow; The accumulated amount of the transmission packets for each traffic flow accumulated in the buffers (FB1, FB2) is transmitted to the controller 13 at the first period t, and the transmission time and the transmission amount of the transmission packets for each traffic flow are transmitted from the controller 13.
  • a device-side transmitting/receiving unit (CTR1, CTR2) that receives at the second cycle Tc ; a main signal transmission unit (MTR1, MTR2) that transmits the transmission packet for each traffic flow in buffers (FB1, FB2) to a wireless network 15 according to the transmission time and the transmission amount; with
  • the controller 13 is A control side that receives the accumulated amount from each of the terminal 11 and the access point 12 in a first cycle t, and transmits the transmission time and the transmission amount to each of the terminal 11 and the access point 12 in a second cycle Tc .
  • a transmitting/receiving unit CTR3 a database unit DB for recording the latest accumulated amount received by the control-side transmitting/receiving unit CTR3, and the past accumulated amount used to determine the past transmission time and the transmission amount;
  • a scheduling unit that determines the transmission time and the transmission amount of the transmission packet for each traffic flow based on the latest accumulation amount and the past accumulation amount recorded in the database unit DB every second cycle Tc . SCH3; Prepare.
  • the control system 301 communicates control signals between the controller 13 and the access points 12/terminals 11 by means of communication different from the communication means for main signals (traffic packets). Specifically, the control signal is transmitted between the control signal transmission/reception unit CTR1 of the terminal 11 and the control signal transmission/reception unit CTR3 of the controller 13, and between the control signal transmission/reception unit CTR2 of the access point 12 and the control signal transmission/reception unit CTR3 of the controller 13. are sent and received via the wireless network 16 between the control signal transmission/reception unit CTR1 of the terminal 11 and the control signal transmission/reception unit CTR3 of the controller 13, and between the control signal transmission/reception unit CTR2 of the access point 12 and the control signal transmission/reception unit CTR3 of the controller 13. are sent and received via the wireless network 16 between
  • Each terminal 11 and access point 12 notifies the controller 13 of the amount of packets accumulated in the flow unit buffer units (FB1, FB2) in the first period t as a control signal.
  • the terminal 11 accumulates packets from each application AP1 in the buffer FB1 for each application (for each flow).
  • the packet amount notification unit NTF1 confirms the accumulated amount of transmission packets in each buffer FB1 (hereinafter, "accumulated amount of transmitted packets" is abbreviated as "packet accumulated amount”) at the first cycle t, and controls this. As a signal, it is notified to the controller 13 via the control signal transmitting/receiving unit CTR1. Also, the access point 12 accumulates packets from the upper network device 50 in the buffer FB2 for each application (for each flow).
  • the packet amount notification unit NTF2 checks the amount of packets accumulated in each buffer FB2 at the first period t, and notifies the controller 13 of this as a control signal via the control signal transmission/reception unit CTR2. Note that the application AP1 may own the flow unit buffer unit FB1.
  • the controller 13 records the notified packet accumulation amount, the terminal 11, the access point 12, and the information of the flow unit buffers (FB1, FB2), and based on this, sets the transmission time and transmission amount for each buffer in the second period. It is determined by Tc and notified to each terminal 11 and access point 12 as a control signal.
  • the first period t and the second period Tc may be the same or different.
  • the control signal transmitting/receiving unit CTR3 of the controller 13 receives control signals from each terminal 11 and the access point 12, and determines the packet accumulation amount included in the control signal, the terminal 11, the access point 12, and the flow unit buffers (FB1, FB2). Organize the information in a database DB.
  • FIG. 5 is a diagram illustrating an example of information arranged in the database DB.
  • This database DB organizes the following four pieces of information.
  • the item number is a serial number for all buffers (FB1, FB2) of the terminal 11 and the access point 12.
  • the node number is the access point 12 or terminal 11 number.
  • the buffer number is the number of the buffer FB1 held by each terminal 11 or the number of the buffer FB2 held by the access point 12 .
  • the amount of packets is the latest accumulated amount of packets held by the buffers having the respective buffer numbers notified from each terminal 11 and access point 12, and the packets recorded in the latest column in each of the past n times of scheduling. is the accumulated amount.
  • the item number K+2 is the latest and past n packet accumulation amounts of the flow unit buffer unit FB1#2 of the terminal 11#1, and the amount is the latest number notified from each terminal 11 and the access point 12.
  • “B 12 — 2 " is the amount of accumulated packets that was previously scheduled, and "B 12 — n” is the amount of accumulated packets that was recorded in the latest column at the time of scheduling n times before. That is, in FIG.
  • the first number from the left is the node (0 is the access point, 1 to N are the terminals), the second number from the left is the buffer number, The third number from the left indicates the amount of accumulated packets at the time of scheduling that was used as the latest one (the amount of accumulated packets that will be used for scheduling from now on is 0, and the "latest" column at the time of scheduling from 1 to n times before The recorded packet accumulation amounts represent 1 to n), respectively.
  • the controller 13 each time the controller 13 performs scheduling, the accumulated packet amounts recorded in the packet amounts shown in FIG. 5 are shifted one column to the right and recorded. For example, when scheduling is performed once, the amount of packets described in the "latest” column is shifted to the "previous” column and recorded. Also, the accumulated packet amount recorded in the "nth” column is discarded after scheduling. In the "Latest” column, the latest reported packet accumulation amount is always recorded.
  • the scheduling unit SCH3 of the controller 13 uses the scheduling method described later to determine the transmission time and transmission amount for each buffer from the contents of the database unit DB. Then, the scheduling unit SCH3 uses the determined transmission time and transmission amount as a control signal, and transmits the control signal transmission/reception unit CTR3 to the terminal 11 or the access point 12.
  • FIG. 1 The scheduling unit SCH3 uses the scheduling method described later to determine the transmission time and transmission amount for each buffer from the contents of the database unit DB. Then, the scheduling unit SCH3 uses the determined transmission time and transmission amount as a control signal, and transmits the control signal transmission/reception unit CTR3 to the terminal 11 or the access point 12.
  • the scheduling unit SCH3 of the controller 13 selects from “latest” to "n times before” for each buffer recorded in the database unit DB shown in FIG.
  • the packet accumulation amount for each buffer is estimated by averaging the packet accumulation amount.
  • the buffer #M having the buffer number M of the terminal 11 #N is taken as an example, and the packets recorded in the row of the item number “K+L+ . . . +M” in FIG. Description will be made using the accumulated amount.
  • the scheduling unit SCH3 may calculate the average value BNM of accumulated packet amounts by simple moving average using equation (1-1). Also, the scheduling unit SCH3 may calculate the average value B_NM of the packet accumulation amount by weighted moving average using equation (1-2). Furthermore, the scheduling unit SCH3 may calculate the average value BNM of accumulated packet amounts by exponential moving average using equation (1-3).
  • ⁇ in equation (1-3) is a smoothing coefficient, which is a constant between 0 and 1.
  • Each terminal 11 and access point 12 extracts the packets accumulated in the flow unit buffer units (FB1, FB2) at the notified transmission time and transmission amount and inputs them to the main signal buffer units (MB1, MB2).
  • the main signal transmitting/receiving units (MTR1, MTR2) transmit the packets of the main signal buffer units (MB1, MB2) to the wireless network 15.
  • FIG. 6 is a flowchart illustrating the operations described above.
  • the control method of this embodiment is a control method for controlling the traffic of the wireless network 15,
  • the control method is transmission control performed by the controller 13 via the wireless network 16 for the terminal 11 and the access point 12 that mutually transmit packets via the wireless network 15, accumulating transmission packets for each traffic flow in respective buffers (FB1, FB2) of the terminal 11 and the access point 12 (steps S111, S112, S121, S122); transmitting the accumulated amount of the transmission packets for each traffic flow accumulated in each of the buffers to the controller 13 at a first period t (steps S113, S123);
  • the controller 13 records the latest accumulated amount and the past accumulated amount received from each of the terminal 11 and the access point 12 in the first cycle t as shown in FIG.
  • step S131 Every second cycle Tc , the controller 13 estimates the current accumulated amount based on the recorded latest accumulated amount and the past accumulated amount, and based on the estimated current accumulated amount Determining the transmission time and transmission amount of the transmission packet for each traffic flow (step S132); transmitting the transmission time and the transmission amount from the controller to each of the terminal and the access point (step S133); and traffic from the buffer of each of the terminal and the access point according to the transmission time and the transmission amount. transmitting the transmission packet for each flow to the wireless network 15 (steps S114, S124); characterized by
  • FIG. 7 is a sequence diagram of the control system 301
  • FIG. 8 is a sequence diagram of a conventional communication system in which the controller 13 does not exist.
  • RTS Request To Send
  • CTS Clear to Send
  • a solid line means communication of the main signal
  • a broken line means communication of the control signal.
  • the communication operation from the main signal buffers (MB1, MB2) in FIG. 7 is the same as the communication operation in FIG.
  • the control system 301 of the present invention can be realized by arranging the controller 13 without modifying the existing communication system.
  • problems occur such as occurrence of packet collision and imbalance in terminals and access points that can transmit. Since the transmission time is controlled for the point, the above problem is resolved.
  • the transmission amount S J [Bytes] of the per-flow buffer #J is The transmission time T J [sec] of the flow unit buffer #J is The transmission time t J [sec] of the flow unit buffer #J is is calculated as
  • the order of the flow unit buffers to start transmission is, for example, starting from the lowest item number arranged in the database unit DB of the controller 13 .
  • the transmission amount S J [Bytes] of the per-flow buffer #J is If T all ⁇ T, then If T all >T, then The transmission time T J [sec] of the flow unit buffer #J is If T all ⁇ T, then If T all >T, then The transmission time t J [sec] of the flow unit buffer #J is If T all ⁇ T, then If T all >T, then is calculated as
  • FIG. 9 shows a block diagram of system 100 .
  • System 100 includes computer 105 connected to network 135 .
  • the network 135 is a data communication network.
  • Network 135 may be a private network or a public network, and may be (a) a personal area network covering, for example, a room; (b) a local area network covering, for example, a building; (d) a metropolitan area network covering, for example, a city; (e) a wide area network covering, for example, a connected area across city, regional, or national boundaries; Any or all of an area network, or (f) the Internet. Communication is by electronic and optical signals through network 135 .
  • Computer 105 includes a processor 110 and memory 115 coupled to processor 110 . Although computer 105 is represented herein as a stand-alone device, it is not so limited, but rather may be connected to other devices not shown in a distributed processing system.
  • the processor 110 is an electronic device made up of logic circuits that respond to and execute instructions.
  • the memory 115 is a tangible computer-readable storage medium in which a computer program is encoded.
  • memory 115 stores data and instructions, or program code, readable and executable by processor 110 to control its operation.
  • Memory 115 may be implemented in random access memory (RAM), hard drive, read only memory (ROM), or a combination thereof.
  • One of the components of memory 115 is program module 120 .
  • Program modules 120 contain instructions for controlling processor 110 to perform the processes described herein. Although operations are described herein as being performed by computer 105 or a method or process or its subprocesses, those operations are actually performed by processor 110 .
  • module is used herein to refer to a functional operation that can be embodied either as a standalone component or as an integrated composition of multiple subcomponents. Accordingly, program module 120 may be implemented as a single module or as multiple modules working in cooperation with each other. Further, although program modules 120 are described herein as being installed in memory 115 and thus being implemented in software, program modules 120 may be implemented in hardware (eg, electronic circuitry), firmware, software, or a combination thereof. Either of them can be realized.
  • Storage device 140 is a tangible computer-readable storage medium that stores program modules 120 .
  • Examples of storage devices 140 include compact discs, magnetic tapes, read-only memory, optical storage media, hard drives or memory units consisting of multiple parallel hard drives, and universal serial bus (USB) flash drives. be done.
  • storage device 140 may be random access memory or other type of electronic storage device located in a remote storage system, not shown, and connected to computer 105 via network 135 .
  • System 100 further includes data source 150 A and data source 150 B, collectively referred to herein as data source 150 and communicatively coupled to network 135 .
  • data sources 150 may include any number of data sources, one or more.
  • Data sources 150 contain unstructured data and can include social media.
  • System 100 further includes user device 130 operated by user 101 and connected to computer 105 via network 135 .
  • User device 130 includes input devices such as a keyboard or voice recognition subsystem for allowing user 101 to communicate information and command selections to processor 110 .
  • User device 130 further includes an output device such as a display or printer or speech synthesizer.
  • a cursor control such as a mouse, trackball, or touch-sensitive screen, allows user 101 to manipulate a cursor on the display to convey further information and command selections to processor 110 .
  • the processor 110 outputs results 122 of execution of the program modules 120 to the user device 130 .
  • processor 110 may provide output to storage 125, such as a database or memory, or via network 135 to a remote device not shown.
  • the program module 120 may be a program that performs steps S131 to S133 in the flowchart of FIG. System 100 may operate as controller 13 .
  • various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be omitted from all components shown in the embodiments. Furthermore, constituent elements across different embodiments may be combined as appropriate.
  • Terminal 12 Access Point 13: Controller 15: Wireless Network 50: Upper Network Device 100: System 101: User 105: Computer 110: Processor 115: Memory 120: Program Module 122: Result 125: Storage Device 130: User Device 135 : network 140: storage device 150: data source 300, 301: control system

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Abstract

L'objet de la présente divulgation est de permettre de réduire l'imprécision dans un volume de paquet accumulé en raison de l'absence d'arrivée de notification de volume de paquet accumulé lorsque la communication de signal de commande destinée au contrôle qualité est mise en œuvre par communication radio.　Un système de commande selon la présente divulgation comprend un terminal et un point d'accès qui se transmettent des paquets l'un à l'autre par l'intermédiaire d'un réseau radio et un dispositif de commande qui effectue une commande de transmission destinée au terminal et au point d'accès par l'intermédiaire du réseau radio. Le dispositif de commande comprend : une unité de base de données qui enregistre le dernier volume accumulé reçu à un premier cycle et un ancien volume accumulé utilisé pour déterminer un temps de transmission passé et un volume de transmission passé ; et une unité de planification qui estime, à chaque second cycle, un volume accumulé actuel sur la base du dernier volume accumulé et de l'ancien volume accumulé enregistrés dans l'unité de base de données et détermine le temps de transmission et le volume de transmission de paquets de transmission pour chaque flux de trafic sur la base du volume accumulé actuel estimé.
PCT/JP2021/037127 2021-10-07 2021-10-07 Système de commande, procédé de commande, dispositif de commande, et programme WO2023058187A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013141138A (ja) * 2012-01-05 2013-07-18 Nec Corp 配信装置、配信方法、およびプログラム
WO2019146563A1 (fr) * 2018-01-25 2019-08-01 日本電気株式会社 Dispositif de communication, système de communication, procédé de communication, et programme
WO2021191999A1 (fr) * 2020-03-24 2021-09-30 日本電信電話株式会社 Système de commande, procédé de commande, contrôleur, et programme

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013141138A (ja) * 2012-01-05 2013-07-18 Nec Corp 配信装置、配信方法、およびプログラム
WO2019146563A1 (fr) * 2018-01-25 2019-08-01 日本電気株式会社 Dispositif de communication, système de communication, procédé de communication, et programme
WO2021191999A1 (fr) * 2020-03-24 2021-09-30 日本電信電話株式会社 Système de commande, procédé de commande, contrôleur, et programme

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