WO2022013967A1 - Dispositif de commande de communication, système de communication et procédé de commande de communication - Google Patents

Dispositif de commande de communication, système de communication et procédé de commande de communication Download PDF

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Publication number
WO2022013967A1
WO2022013967A1 PCT/JP2020/027489 JP2020027489W WO2022013967A1 WO 2022013967 A1 WO2022013967 A1 WO 2022013967A1 JP 2020027489 W JP2020027489 W JP 2020027489W WO 2022013967 A1 WO2022013967 A1 WO 2022013967A1
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Prior art keywords
communication
communication devices
unit
data
core network
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PCT/JP2020/027489
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English (en)
Japanese (ja)
Inventor
恭平 小川
宏行 山野
紘一郎 東
一司 小池
▲祥▼ 川島
岳大 藤井
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富士通株式会社
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Priority to JP2022536037A priority Critical patent/JP7338794B2/ja
Priority to PCT/JP2020/027489 priority patent/WO2022013967A1/fr
Publication of WO2022013967A1 publication Critical patent/WO2022013967A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]

Definitions

  • the present invention relates to a communication control device, a communication system, and a communication control method.
  • next-generation radio communication network 5G
  • O-RAN Open Radio Access Network
  • the interface of the front hall is standardized, it becomes possible to connect aggregate nodes and distributed nodes of different vendors, and it is possible to flexibly construct a network.
  • connection between the O-DU (O-RAN Distributed Unit), which is an aggregate node connected to the core network, and the O-RU (O-RAN Radio Unit), which is a distributed node, is shown in the figure.
  • Two types of connection shown in 8 are considered.
  • One is, for example, as shown in FIG. 8A, in an FHM configuration in which an FHM (Front Haul Multiplexer) 2 is connected to one O-DU1 and a plurality of O-RUs 3 to 5 are connected in parallel to the FHM2.
  • the other is, for example, as shown in FIG. 8 (b), which is a cascade configuration in which a plurality of O-RUs 3 to 5 are connected in series to one O-DU1.
  • a plurality of O-RUs may form one cell to perform wireless communication. That is, each O-RU may combine the range in which wireless communication is possible to form one large cell, and the cell may be expanded. Such cells are sometimes referred to as shared cells.
  • Each O-RU forming a shared cell in a cascade configuration receives data received from a terminal device by wireless communication and data received from a lower node (O-RU) connected to a side far from the core network. It is combined, and the data obtained by combining is transmitted to a higher-level node (O-RU or O-DU) connected to the side closer to the core network.
  • O-RU lower node
  • O-DU higher-level node
  • each O-RU since a plurality of O-RUs are connected in series, each O-RU receives data from only one node connected to the lower level and receives data from the terminal device itself. Combine with the data to be used.
  • the disclosed technology has been made in view of this point, and is a communication control device, a communication system, and a communication control capable of continuing the service even if a failure occurs between a plurality of nodes connected in a cascade configuration.
  • the purpose is to provide a method.
  • the communication control device disclosed in the present application is, in one embodiment, a communication control device that controls communication by a plurality of communication devices connected in series, and includes a transmission unit that transmits data to the plurality of communication devices and the above-mentioned communication control device.
  • It has a processor connected to a transmission unit, and the processor searches for a connection relationship of the plurality of communication devices including a connection by a redundant path, and based on the searched connection relationship, each of the plurality of communication devices Communicates a configuration file that includes identification information that identifies the higher-level communication device that connects to the side closer to the core network and the lower-level communication device that connects to the lower-level communication device that connects to the side farther from the core network, and a flag that indicates whether or not the lower-level communication device is valid.
  • a process of generating for each device and distributing the generated setting file from the transmitter to the plurality of communication devices is executed.
  • the communication control device According to one aspect of the communication control device, the communication system, and the communication control method disclosed in the present application, there is an effect that the service can be continued even if a failure occurs between a plurality of nodes connected in a cascade configuration. ..
  • FIG. 1 is a diagram showing a configuration of a communication system according to an embodiment.
  • FIG. 2 is a block diagram showing a configuration of an O-DU according to an embodiment.
  • FIG. 3 is a diagram showing a specific example of the setting file.
  • FIG. 4 is a block diagram showing the configuration of the O-RU according to the embodiment.
  • FIG. 5 is a sequence diagram showing a communication control method according to an embodiment.
  • FIG. 6 is a diagram showing a specific example of flag setting.
  • FIG. 7 is a diagram showing another specific example of flag setting.
  • FIG. 8 is a diagram showing a specific example of the connection form of the node.
  • FIG. 1 is a diagram showing a configuration of a communication system according to an embodiment.
  • the O-DU 100 which is an O-RAN aggregation node, is connected to the core network N and the GMC (Grand Master Clock) 10.
  • a C / U plane Control / User plane
  • S plane Synchronization plane
  • a plurality of O-RU 210 to 240 which are distributed nodes of O-RAN, are connected in series to the O-DU 100. That is, the plurality of O-RU 210 to 240 are connected to the O-DU 100 in a cascade configuration. Further, in order to form a redundant route to be used when a failure occurs, the O-RU 210 and the O-RU 240 are directly connected. Between the O-DU 100 and the O-RU 210 to 240, in addition to the C / U plane and the S plane, an M plane (Management plane) for maintaining and managing the equipment is established.
  • M plane Management plane
  • the plurality of O-RUs 210 to 240 form a shared cell C, and the terminal devices 20 to 40 located in the shared cell C wirelessly communicate with the nearest O-RUs 210 to 240, respectively. That is, for example, the terminal device 20 wirelessly communicates with the O-RU 220, the terminal device 30 wirelessly communicates with the O-RU 230, and the terminal device 40 wirelessly communicates with the O-RU 240.
  • each O-RU 210-240 When each O-RU 210-240 receives data from the terminal device, it transfers the data to a higher node closer to the core network N than itself. At this time, the O-RUs 210 to 240 combine the data received from the lower node farther from the core network N than themselves and the data received from the terminal device, and transfer the obtained combined data to the upper node. .. That is, the O-RU 240 transfers the data received from the terminal device 40 to the upper O-RU 230. The O-RU 230 combines the data received from the lower O-RU 240 and the data received from the terminal device 30, and transfers the obtained combined data to the upper O-RU 220.
  • the O-RU 220 combines the data received from the lower O-RU 230 and the data received from the terminal device 20, and transfers the obtained combined data to the upper O-RU 210.
  • the O-RU 210 transfers the data received from the lower O-RU 220 to the upper O-DU 100.
  • the operation of these O-RU210-240 is according to the setting file distributed from O-DU100. That is, the O-DU 100 searches for a topology showing the connection relationship of the O-RU 210 to 240, generates a setting file that identifies the upper and lower nodes of each O-RU 210 to 240, and uses the setting file as the O-RU 210. Distribute to ⁇ 240.
  • This configuration file contains a flag that indicates whether the connection with the lower node is valid. That is, for example, below the O-RU 210, there is an O-RU 240 connected by a redundant path in addition to the O-RU 220, and there are two lower nodes.
  • the O-RU 210 combines the data received from the terminal device by itself with the data received from the valid lower O-RU 220, and the obtained combined data is combined with the higher O-DU 100. Transfer to.
  • FIG. 2 is a block diagram showing the configuration of the O-DU 100 according to the embodiment.
  • the O-DU 100 shown in FIG. 2 includes a core network interface unit (hereinafter abbreviated as “core network I / F unit”) 110, a processor 120, a cascade interface unit (hereinafter abbreviated as “cascade I / F unit”) 130, and It has a memory 140.
  • core network I / F unit core network interface unit
  • processor 120 hereinafter abbreviated as “cascade interface unit” 130
  • cascade I / F unit cascade interface unit 130
  • the core network I / F unit 110 is an interface for connecting to the core network N, and transmits / receives data on the C / U plane.
  • the core network I / F unit 110 outputs the data received from the core network N to the processor 120, and transmits the data input from the processor 120 to the core network N.
  • the processor 120 includes, for example, a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), etc., and controls the entire O-DU 100 in an integrated manner.
  • the processor 120 includes an upper layer protocol processing unit 121, a failure detection unit 122, a topology search unit 123, a flag management unit 124, a setting file generation unit 125, and a transmission / reception control unit 126.
  • the upper layer protocol processing unit 121 executes processing of higher layer protocols such as an RRC (Radio Resource Control) layer, a SDAP (Service Data Adaptation Protocol) layer, and a PDCP (Packet Data Convergence Protocol) layer for data.
  • the upper layer protocol processing unit 121 processes the data input from the core network I / F unit 110 for each protocol, and outputs the obtained transmission data to the transmission / reception control unit 126. Further, the upper layer protocol processing unit 121 processes the received data input from the transmission / reception control unit 126 for each protocol, and outputs the obtained data to the core network I / F unit 110.
  • RRC Radio Resource Control
  • SDAP Service Data Adaptation Protocol
  • PDCP Packet Data Convergence Protocol
  • the failure detection unit 122 detects a communication failure due to O-RU 210 to 240 connected in a cascade configuration. That is, the failure detection unit 122 detects a failure such as a broken link between the O-RU 210 and 240 by, for example, confirming the continuity of the data on the M plane. Then, when the failure detection unit 122 detects a communication failure due to the O-RU 210 to 240, the failure detection unit 122 notifies the topology search unit 123 to that effect.
  • the topology search unit 123 searches for a topology showing the connection relationship of the O-RU 210 to 240 when the communication system including the O-RU 210 to 240 is activated and when the failure detection unit 122 notifies the failure detection. Specifically, the topology search unit 123 identifies an upper node connected to the side closer to the core network N and a lower node connected to the side farther from the core network N for each O-RU 210 to 240. At this time, when a failure has occurred, the topology search unit 123 identifies the upper node and the lower node of each O-RU 210 to 240 so as to bypass the location where the failure has occurred by using a redundant route.
  • the topology search unit 123 has the O-RU210 as the upper node is the O-DU100 and the lower node is the O-RU220 and the O-RU240 via the redundant route. Identify as being. Further, the topology search unit 123 specifies that the upper node is the O-RU210 and the lower node is the O-RU230 for the O-RU 220. Further, the topology search unit 123 specifies that the upper node is the O-RU 220 and the lower node is the O-RU 240 for the O-RU 230. Further, the topology search unit 123 specifies that the upper node of the O-RU 240 is the O-RU 230 and the O-RU 210 via the redundant route, and there is no lower node.
  • the topology search unit 123 indicates that the upper node is O-DU100 and the lower node is O-RU220 and the redundant route for O-RU210. It is identified as O-RU240 via. Further, the topology search unit 123 specifies that the O-RU 220 has no lower node because the upper node is the O-RU 210 and a failure has occurred between the O-RU 220 and the O-RU 230. Further, the topology search unit 123 specifies that the upper node of the O-RU 230 is the O-RU 240 and there is no lower node because a failure has occurred between the O-RU 230 and the O-RU 220. Further, the topology search unit 123 specifies that the upper node is the O-RU210 via the redundant path and the lower node is the O-RU230 for the O-RU 240.
  • the topology search unit 123 notifies the flag management unit 124 and the setting file generation unit 125 of the upper node and the lower node of each O-RU 210 to 240.
  • the flag management unit 124 manages the flags in the setting files of each of the O-RU 210 to 240 according to the result of the topology search by the topology search unit 123. Specifically, the flag management unit 124 turns on or off the flag indicating whether or not the lower node of each O-RU 210 to 240 is a valid lower node. That is, the flag management unit 124 instructs the configuration file generation unit 125 to turn on the flag related to the valid lower node and turn off the flag related to the invalid lower node. At this time, the flag management unit 124 determines whether the lower node is valid or invalid so that there is a data transfer path from all the O-RU 210 to 240 to the O-DU 100, and determines whether the flag is on or off.
  • the flag management unit 124 turns on the flag related to O-RU220 among the O-RU220 and 240 which are lower nodes of O-RU210, and connects via a redundant route. Determined to turn off the flag for O-RU240. Further, the flag management unit 124 determines that the flag for the lower node is turned on for the other O-RU 220 and 230 having the lower node because there is only one lower node to be connected. As a result, each O-RU 210 to 240 combines the data received from the terminal device and the data received from the lower node whose flag is on, and transfers the obtained combined data to the upper node. The data from O-RU 210 to 240 will be transferred to O-DU 100.
  • the flag management unit 124 determines to turn on the flags related to both O-RU 220 and 240, which are lower nodes of O-RU 210. .. Further, the flag management unit 124 determines that the flag for the lower node is turned on because the connected lower node is only the O-RU 230 for the other O-RU 240 having the lower node. As a result, each O-RU 210 to 240 combines the data received from the terminal device and the data received from the lower node whose flag is on, and transfers the obtained combined data to the upper node. The data from O-RU 210 to 240 will be transferred to O-DU 100.
  • the setting file generation unit 125 generates a setting file showing the result of the topology search by the topology search unit 123 for each of O-RU 210 to 240. Specifically, the setting file generation unit 125 generates a setting file for specifying the upper node and the lower node for each O-RU 210 to 240, for example, as shown in FIG.
  • FIG. 3 is a specific example of a setting file for O-RU210.
  • the upper node of O-RU210 is O-DU100
  • the lower node of O-RU210 is O-RU220, 240.
  • the configuration file contains information such as a MAC (Media Access Control) address and a port number that identify these upper and lower nodes.
  • the setting file stores on or off of the flag determined by the flag management unit 124 for each lower node. In the example shown in FIG. 3, the flag of O-RU 220 is on and the flag of O-RU 240 is off.
  • the setting file generation unit 125 generates a setting file every time the topology is searched by the topology search unit 123, and includes the flag on / off information determined by the flag management unit 124 in the setting file. Then, the setting file generation unit 125 outputs the generated setting file to the transmission / reception control unit 126.
  • the transmission / reception control unit 126 further performs necessary C / U plane protocol processing on the transmission data processed by the upper layer protocol processing unit 121, and transmits the transmission data to the O-RU 210 via the cascade I / F unit 130. Further, the transmission / reception control unit 126 processes the required C / U plane protocol for the received data received from the O-RU 210 via the cascade I / F unit 130, and outputs the data to the upper layer protocol processing unit 121. Further, the transmission / reception control unit 126 distributes the setting files of the O-RU 210 to 240 output from the setting file generation unit 125 to the O-RU 210 to 240 via the cascade I / F unit 130.
  • the cascade I / F unit 130 is an interface connected to the highest O-RU210 among the O-RU210 to 240 connected in the cascade configuration.
  • the cascade I / F unit 130 transmits / receives C-plane and U-plane data to / from the O-RU 210, and also transmits / receives M-plane data.
  • the memory 140 includes, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory), and stores various information when a process is executed by the processor 120.
  • a RAM Random Access Memory
  • ROM Read Only Memory
  • FIG. 4 is a block diagram showing the configuration of the O-RU 210 according to the embodiment.
  • the O-RU 220 to 240 also have the same configuration as the O-RU 210.
  • the O-RU 210 shown in FIG. 4 includes a wired interface unit (hereinafter abbreviated as “wired I / F unit”) 211, a wireless interface unit (hereinafter abbreviated as “wireless I / F unit”) 212, a processor 213, and a memory 214.
  • wired I / F unit hereinafter abbreviated as “wired I / F unit”
  • wireless I / F unit wireless interface unit
  • the wired I / F unit 211 is an interface that connects to the upper node and the lower node by wire, and transmits / receives data on the C / U / M plane.
  • the wired I / F unit 211 outputs the received data to the processor 213, and transmits the data output from the processor 213 to the upper node or the lower node.
  • the wireless I / F unit 212 is an interface for wirelessly connecting to a terminal device.
  • the wireless I / F unit 212 outputs the data received from the terminal device to the processor 213, and transmits the data output from the processor 213 to the terminal device.
  • the processor 213 is equipped with, for example, a CPU, FPGA, DSP, etc., and controls the entire O-RU210 in an integrated manner. Specifically, the processor 213 has a setting file holding unit 213a and a duplication / coupling control unit 213b.
  • the setting file holding unit 213a holds a setting file distributed by the O-DU 100 and received by the wired I / F unit 211. That is, for example, since the setting files of the O-RU 210 to 240 are distributed from the O-DU 100 when the communication system is started or a failure occurs, the setting file holding unit 213a holds the setting file of the O-RU 210.
  • the other O-RU 220 to 240 setting file holding units also hold their own setting files.
  • the duplication / combination control unit 213b When the duplication / combination control unit 213b receives data by the wired I / F unit 211 or the wireless I / F unit 212, the duplication / combination control unit 213b executes data duplication or combination according to the setting file, and uses the obtained data as the wired I / F. Output to unit 211 or wireless I / F unit 212. Specifically, when the data received by the wired I / F unit 211 is data from a higher-level node, the duplication / combination control unit 213b generates data for its own device and for transfer by duplicating the data.
  • the duplication / combination control unit 213b wirelessly transmits the data for its own device from the wireless I / F unit 212 to the terminal device among the duplicated data, and lowers the data for transfer from the wired I / F unit 211. Transfer to the node.
  • the duplication / combination control unit 213b refers to the setting file held in the setting file holding unit 213a and transmits the data. Determine if the original subordinate node is a valid subordinate node. That is, the duplication / combination control unit 213b refers to the flag for each lower node stored in the setting file, and determines whether or not the data received by the wired I / F unit 211 is received from the lower node whose flag is on. to decide.
  • the duplication / combination control unit 213b combines the data received from all the valid lower nodes with the data received from the terminal device by the wireless I / F unit 212, and the obtained combined data is wired I. / Transfers from the F unit 211 to the upper node.
  • the memory 214 includes, for example, a RAM or a ROM, and stores various information when the process is executed by the processor 213.
  • a setting file including a flag indicating valid / invalid of a lower node is generated by the flag management unit 124 and the setting file generation unit 125 from the topology search result by the topology search unit 123 of the O-DU 100. It will be distributed to each O-RU 210-240.
  • the flag as shown in FIG. 6 is stored in the setting file, for example. That is, in the setting file of O-RU210, the flag of O-RU220, which is a lower node, is set to be on, and the flag of O-RU240 is set to be off. Further, in the setting files of O-RU 220 and 230, the flags of O-RU 230 and 240, which are lower nodes, are set to be valid.
  • step S101 when data is received from the terminal device by O-RU 240, this data is transmitted to O-RU 230 of the upper node (step S101). Then, the O-RU 230 combines the data received from the terminal device by itself with the data received from the lower node O-RU 240 whose flag is on, and the obtained combined data is transferred to the upper node O-RU 220. It is transmitted (step S102). Similarly, the O-RU 220 combines the data received from the terminal device by itself with the data received from the lower node O-RU 230 whose flag is on, and the obtained combined data is the O-RU 210 of the upper node. Is transmitted to (step S103).
  • the O-RU 210 combines the data received from the terminal device by itself with the data received from the lower node O-RU 220 whose flag is on, and the obtained combined data is transferred to the O-DU 100 of the upper node. It is transmitted (step S104). At this time, even if the data is received from the lower node O-RU240, the data received from the O-RU240 is combined with other data because the O-RU240 flag is off in the setting file of the O-RU210. Will not be done.
  • the failure detection unit 122 of the O-DU 100 detects that a failure has occurred between the O-RU 220 and 230 (step S105). Specifically, for example, by confirming the continuity of the data on the M plane, it is detected that a failure has occurred in the link between the O-RU 220 and the O-RU 230.
  • the topology search unit 123 of the O-DU 100 re-searches the topology showing the connection relationship of the O-RU 210 to 240 (step S106). That is, the upper node and the lower node of each O-RU 210 to 240 when the redundant route is used without using the link between the failed O-RU 220 and 230 are specified.
  • the O-RU210 is connected to the lower part of the O-DU100
  • the O-RU220 and the O-RU240 are connected to the lower part of the O-RU210
  • the lower part of the O-RU240 is connected.
  • a connection relationship in which the O-RU 230 is connected can be obtained.
  • the setting file generation unit 125 When the topology is re-searched, the setting file generation unit 125 generates a setting file, and the flag management unit 124 sets a flag for the lower node in each setting file.
  • a flag as shown in FIG. 7, for example is stored in the setting file. That is, in the setting file of O-RU210, on is set to indicate that the flags of both the lower nodes O-RU220 and O-RU240 are valid. Further, in the setting file of O-RU240, the flag of O-RU230, which is a lower node, is set to be on to indicate validity.
  • the O-RU 220 and 230 adjacent to the location where the failure occurred have no lower node because they are the lowest nodes, and the setting files of these O-RU 220 and 230 do not include the flag.
  • each O-RU210 to 240 When the setting file is distributed to O-RU210 to 240, this setting file is held by the setting file holding unit 213a of each O-RU210 to 240. As a result, the duplication / combination control unit 213b of each O-RU 210 to 240 duplicates the data received from the upper node and transfers it to the lower node, and at the same time, the data received from the lower node whose flag is on is terminal. It will be combined with the data received from the device and transferred to the upper node.
  • this data is transmitted to the O-RU 210 of the upper node (step S108). Further, when the data is received from the terminal device by the O-RU 230, this data is transmitted to the O-RU 240 of the upper node (step S109). Then, the O-RU 240 combines the data received from the terminal device by itself with the data received from the lower node O-RU 230 whose flag is on, and the obtained combined data is transferred to the upper node O-RU 210. It is transmitted (step S110).
  • the O-RU210 combines the data received from the terminal device by itself with the data received from the lower nodes O-RU220 and O-RU240 whose flag is on, and the obtained combined data is the upper node. It is transmitted to the O-DU100 (step S111). That is, the data received from the O-RU 240, which was not valid before the occurrence of the failure, is also the target of the combination, and the data received from the two lower nodes is combined with the data received from the terminal device. In this way, valid subordinate nodes are indicated by the flags in the configuration file, so even if a failure occurs between O-RU210-240 connected in a cascade configuration, each O-RU210-240 will be the target of the join.
  • the data becomes clear, and the data from all the O-RUs 210 to 240 can be combined and transferred to the O-DU100. As a result, even if a failure occurs in the communication system, the service using the shared cell formed by, for example, O-RU 210 to 240 can be continued.
  • the setting file of each O-RU includes a flag indicating valid / invalid of the lower node, and there is a data transfer route from all O-RUs to O-DUs.
  • the flag is set to. Therefore, even if a failure occurs between O-RUs connected in a cascade configuration and a redundant route is used, a valid lower node of each O-RU can be set by a configuration file, and each O-RU can be set.
  • the data to be combined is clarified in. As a result, even if a failure occurs between a plurality of nodes connected in a cascade configuration, data from all O-RUs can be transferred while being combined, and the service can be continued.
  • the four O-RUs O-RU 210 to 240 are connected in a cascade configuration, but the number of O-RUs connected in series is not limited to four.
  • a valid lower node in each O-RU can be set by a flag in the setting file as in the above embodiment.
  • the O-RU 210 and the O-RU 240 are connected by a redundant route, but the redundant route may be formed between other O-RUs.
  • the redundant route may be formed between O-RU 210 and 230.
  • the O-RU 210 has three lower nodes, O-RU 220, 230, and 240, and it is possible to appropriately set a valid lower node by the flag of the above embodiment. ..

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un dispositif de commande de communication (100) pour commander la communication par une pluralité de dispositifs de communication (210-240) connectés en série, le dispositif de commande de communication (100) comprenant une unité de transmission (130) permettant de transmettre des données à la pluralité de dispositifs de communication (210-240), et un processeur (120) connecté à l'unité de transmission (130), le processeur (120) exécutant un traitement consistant à : rechercher des relations de connexion entre les dispositifs de la pluralité de dispositifs de communication (210-240) comprenant une connexion par un trajet redondant ; produire, en fonction des relations de connexion recherchées et pour les dispositifs de communication respectifs (210-240), des fichiers de configuration qui comprennent des informations d'identification pour identifier, par rapport aux dispositifs de communication, un dispositif de communication d'ordre supérieur connecté au côté plus proche d'un réseau central et un dispositif de communication d'ordre inférieur connecté au côté plus éloigné du réseau central et comprennent des indicateurs indiquant si le dispositif de communication d'ordre inférieur est activé ; et distribuer les fichiers de configuration produits de l'unité de transmission (130) aux dispositifs de communication (210-240).
PCT/JP2020/027489 2020-07-15 2020-07-15 Dispositif de commande de communication, système de communication et procédé de commande de communication WO2022013967A1 (fr)

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