WO2018108168A1 - Procédé de mise en œuvre d'un service de multidiffusion d'un réseau de transmission de paquets, dispositif associé et système de communication - Google Patents

Procédé de mise en œuvre d'un service de multidiffusion d'un réseau de transmission de paquets, dispositif associé et système de communication Download PDF

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Publication number
WO2018108168A1
WO2018108168A1 PCT/CN2017/116631 CN2017116631W WO2018108168A1 WO 2018108168 A1 WO2018108168 A1 WO 2018108168A1 CN 2017116631 W CN2017116631 W CN 2017116631W WO 2018108168 A1 WO2018108168 A1 WO 2018108168A1
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transport network
multicast service
packet transport
channel
network device
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PCT/CN2017/116631
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English (en)
Chinese (zh)
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刘华
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中兴通讯股份有限公司
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Publication of WO2018108168A1 publication Critical patent/WO2018108168A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services

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  • Embodiments of the present invention relate to, but are not limited to, the technical field of data transmission networks, and in particular, to a multicast service implementation method and apparatus for a packet transmission network.
  • the bandwidth utilization requirements of the packet switched network are increased, and the communication system is implemented by using a dedicated physical channel to implement multimedia broadcast multicast.
  • the multicast service is specifically configured to provide a dedicated physical channel between each user equipment and the server for their respective use. That is to say, even if a plurality of user equipments receive data streams of the same service, they need to be implemented by respective dedicated physical signals, and the server also needs to feed back the data flow requested by each user.
  • This method is relatively simple to implement and is suitable for situations where there are fewer users of multiple multicast services.
  • a method and device for implementing a multicast service of a packet transport network provided by an embodiment of the present invention.
  • An embodiment of the present invention provides a method for implementing a multicast service in a packet transport network, including:
  • the packet transport network device receives the multicast service sent by the gateway device through the point-to-multipoint P2MP channel;
  • the packet transport network device pushes the multicast service to the downlink base station.
  • An embodiment of the present invention further provides a multicast service implementation apparatus for a packet transport network, including: receiving Module and interaction module;
  • the receiving module is configured to receive, by the packet transport network device, the gateway device to send the multicast group service through the point-to-multipoint P2MP channel;
  • the interaction module is configured to push the multicast group service received by the packet transport network device to the downlink base station.
  • the embodiment of the present invention further provides a computer readable storage medium, where the computer readable storage medium stores computer executable instructions, and the computer executable instructions are used to execute the multicast service implementation method of the packet delivery network provided above. .
  • the packet transport network device receives the multicast service sent by the gateway device through the point-to-multipoint P2MP channel, and the packet transport network device passes the pre- The interaction protocol is configured to interact with the attached base station to push the multicast service to the downlink base station.
  • the gateway device directly pushes the received multicast service through the point-to-multipoint channel by implementing the method provided by the embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for implementing a multicast service in a packet transport network according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic diagram of an edge device that supports P2MP in both L2VPN and L3VPN according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of an edge device supporting only P2MP by L3VPN according to Embodiment 1 of the present invention
  • FIG. 4 is a structural block diagram of a device for implementing a multicast service in a packet transport network according to Embodiment 2 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the multicast service implementation method provided in this embodiment is mainly based on a device that supports a P2MP (Point to Multiple Point) channel.
  • the P2MP channel has "any multicast group only occupies the same physical span in the network.
  • the Multimedia Broadcast Multicast Services_GateWay (MBMS_GW) pushes all multicast services to the packet transport network equipment (Packet Transport Network) of each directly connected base station through the P2MP channel.
  • the packet transport network device is used as a querier, and the downlink base station interacts with the Internet Group Management Protocol (IGMP) to determine the multicast traffic pushed by each base station.
  • IGMP Internet Group Management Protocol
  • FIG. 1 is a flowchart of a method for implementing a multicast service of a packet transport network according to an embodiment of the present disclosure.
  • the implementation method includes steps S101 and S102.
  • Step S101 The packet transport network device receives the multicast service sent by the gateway device through the point-to-multipoint P2MP channel, where the packet transport network device is used to push the base station to push the multicast service.
  • the packet transport network device is a preset PTN device or PC capable of supporting point-to-multipoint P2MP channel transmission, and the packet transport network device may be used for bridging the second layer virtual network layer and the first
  • the bridge device of the layer 3 virtual network layer may also be a PTN device directly connected to at least one base station; when the packet transport network device connected to the gateway device supports the P2MP channel, the gateway device receives the group sent by the external server. After the traffic is broadcast, the received multicast stream is directly sent to the packet transport network device through the P2MP channel.
  • the gateway device does not need to send according to the number of the connected base stations when transmitting the multicast traffic, and only needs to send one copy for the same service gateway device for multiple downlink base stations, and does not need to be used for each base station.
  • the gateway device When sending and communicating with multiple PTN devices through the P2MP channel, only one P2MP channel needs to be set, which greatly reduces the gateway device. When traffic load is transmitted.
  • the method before the step of receiving the multicast service through the point-to-multipoint P2MP channel, the method further includes: querying whether there is a point-to-multipoint P2MP channel between the packet transport network device and the gateway device. If there is no point-to-multipoint P2MP channel between the packet transport network device and the gateway device, a point-to-multipoint P2MP channel is created according to the preset channel model.
  • the method further includes: adding a query label to the created point-to-multipoint P2MP channel, and creating the channel and corresponding The query tag is updated to the corresponding relationship table.
  • Step S102 the packet transport network device pushes the multicast service to the downlink base station.
  • the packet transport network device when the multicast service interaction between the packet transport network device and the attached base station is performed by using a preset interaction protocol, preferably, the preset interaction protocol is an IGMP protocol;
  • the packet transport network device After the transport network device receives the multicast service sent by the gateway, the packet transport network device queries the corresponding multicast service from the multicast service to the corresponding base station according to the service request of each of the connected base stations.
  • the packet transport network device is used as an IGMP querier (IGMP Quierer), and the packet transport network device and the attached base station interact with each other through an IGMP protocol, specifically
  • the packet transport network device and the connected base station query the actual multicast service of the connected base station through the Internet group management protocol, and push the corresponding multicast service to the downlink base station according to the actual interactive multicast service that is queried. That is, the multicast service push corresponding to the base station is selected from the multicast service according to the actual situation of interaction with the attached base station.
  • the packet transport network device is an access layer packet transport network device directly connected to at least one of the downlink base stations, and the receiving module receives the gateway device through a point-to-multipoint P2MP channel through an access layer packet transport network device.
  • the multicast group service is sent, and the access layer packet transport network device delivers the received multicast service to the downlink base station according to the corresponding interaction protocol, specifically, the gateway device passes the point-to-multipoint P2MP channel.
  • the multicast service is sent to an access layer packet transport network device to which the base station is connected.
  • the schematic diagram of the P2MP edge device supported by both the L2VPN and the L3VPN provided in this embodiment is sent by the MBMS_GW (gateway device) from the external server.
  • Multicast traffic where the multicast traffic includes traffic of at least one type of traffic, such as video traffic, television programming, audio traffic, and the like.
  • the PTN device directly copies the corresponding multicast service and then pushes the corresponding multicast service to the base station.
  • the service types of the multiple base stations are different, the PTN device needs to obtain the traffic corresponding to the service type of the interaction between the base stations before pushing the multicast service. According to the service class, the PTN device pushes the corresponding traffic for the base station. .
  • the MBMS_GW sends the received multicast traffic to the PTN devices K1 and K2 without any filtering process; after receiving the multicast service, the K1 and K2 receive the next PTN device according to the receiving. Or the request sent by the base station to push the multicast service.
  • the specific push mode is as follows:
  • the K1 queries the multicast service from the multicast traffic to the base station 1 according to the service request of the base station 1, and finally pushes the multicast service to the user equipment through the base station;
  • multicast traffic can be pushed according to the foregoing manner, and each layer of the PTN device can be properly filtered before being pushed.
  • the push efficiency can be greatly improved.
  • the PTN device is connected to both the base station and the PTN device, the service traffic is pushed according to the first mode and the second mode.
  • FIG. 3 is a schematic diagram of an edge device that only supports the P2MP by using the L3VPN according to the embodiment, and the specific process for implementing the multicast service interaction based on the edge device in FIG. 3 is:
  • the packet transport network device When the packet transport network device does not support the P2MP channel in the L2VPN, and all the packet transport network devices in the L3VPN support the point-to-multipoint channel, the packet transport network device receives the group sent by the gateway device through the point-to-multipoint P2MP channel.
  • the broadcast service is: the packet transport network device is a packet transport network device bridging each of the Layer 2 and Layer 3 virtual network layers of the Layer 2 virtual network layer L2VPN and the Layer 3 virtual network layer L3VPN, and the receiving module passes through two layers and three layers.
  • the network sending device receives the multicast group service sent by the gateway device through the point-to-multipoint P2MP channel, and the packet transport network device bridged by the two Layer 3 virtual network layers pushes the received multicast group service to the next Access layer packet transport network device.
  • the L3VPN includes PTN devices K1, K2, and M1 to M4, where M1 to M4 are bridge devices of L2VPN and L3VPN, and K1, K2, and M1 to M4 are new devices supporting P2MP, in L3VPN and MBMS_GW.
  • the interaction process of the multicast service is that the MBMS_GW receives the multicast traffic sent from the external server, where the multicast traffic includes traffic of at least one service type, for example, video traffic, television programs, audio traffic, and the like.
  • the MBMS_GW sends the received multicast traffic to the PTN devices K1 and K2 without any filtering process.
  • K1 and K2 After receiving the multicast traffic, K1 and K2 perform the group according to the request sent by the next PTN device or the base station.
  • the push of the broadcast traffic that is, the devices M1, M3 and the base station 1 connected to K1 shown in FIG. 3, the group multicast service interaction process between K1 and the devices M1, M3 and the base station 1 is the same as that in FIG. Here, we will not repeat them.
  • the interaction process between the base station and the base station in FIG. 3 is specifically performed through the original communication link.
  • the M1 and the M2 are connected to each other.
  • the devices N1, N2, and devices A, B, C, and D are directly connected through VPLS or VPLS.
  • the Layer 2 and Layer 3 bridged PTN devices M1 and M2 respectively deliver multicast traffic to devices N1 and N2.
  • the devices A, B, C, and D are used as the IGMP querier to determine whether to push the multicast service and push the multicast service by using the IGMP protocol.
  • the step of implementing the push processing from the PTN device to the downlink base station by using the PTN device as the IGMP querier includes: when a plurality of downlink base stations are connected to the packet transport network device, The packet transport network device copies multiple multicast services according to the preset number of pushes of the virtual local area network, and respectively pushes the multicast service to the corresponding multiple downlink base stations, where the specific packet transport network device is used to implement A packet transport network device bridged by two or three layers of virtual networks and other packet transport network devices connected to each base station, but regardless of which type of packet transport network device, there are cases where multiple base stations are connected, and then according to the request
  • the multicast service is copied and then sent to the base station, where the multicast service is copied according to the number of base stations connected to the virtual local area network, and the copied multicast service is separately sent to the base station. Correspondingly Hanging base stations.
  • the base station 2 and the base station 3 are connected to the device A.
  • the two base stations request the same service at the same time, they are all video traffic.
  • the device A receives the multicast traffic. Querying the number of received service requests for video traffic or querying the pre-set number of virtual local area network service pushes.
  • the number of virtual local area network service pushes is preset according to the number of connected base stations, and device A is based on the queried service.
  • the number of requests or the number of service pushes is used to copy the video traffic.
  • the number of copies is equal to the number of service requests or the number of service pushes.
  • the obtained video traffic is pushed to the corresponding multiple downlink base stations.
  • the MBMS_GW pushes all the multicast services to the PTN device of each directly connected base station through the P2MP channel, and then uses the PTN device as a querier and hangs
  • the base station determines the multicast service pushed by each base station through IGMP protocol interaction, and realizes that only one service data is pushed by the MBMS_GW, which greatly reduces the workload of the gateway interaction data.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented when the computer executable instructions are executed to implement the multicast business implementation method of the packet transport network.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 4 is a structural block diagram of a device for implementing a multicast service in a packet transport network according to the embodiment.
  • the multicast service implementation apparatus 4 of the packet transport network includes: a receiving module 41 and an interaction module 42, where:
  • the receiving module 41 is configured to receive, by the packet transport network device, a multicast group service that is sent by the gateway device through the P2MP channel, where the preset packet transport network device is used to push the base station to push the multicast group.
  • the packet transport network device connected to the gateway device supports the P2MP channel, and the receiving module 41 does not need to send according to the number of the connected base stations when transmitting the multicast service, for multiple downlink base stations.
  • the same service gateway device only needs to send one copy, and does not need to be sent for each base station, and only needs to set a P2MP channel when communicating with multiple PTN devices through the P2MP channel, thereby greatly reducing the gateway respectively.
  • the multicast service implementation apparatus further includes a query module, a channel creation module, and a label module, and the query module is configured to query whether a point exists between the packet transport network device and the gateway device To the multi-point P2MP channel; if there is no point-to-multipoint P2MP channel between the packet transport network device and the gateway device, the channel creation module creates a point-to-multipoint P2MP channel according to the preset channel model.
  • the tag module is configured to add a label to the created point-to-multipoint P2MP channel, where the tag is used to identify the point-to-multipoint P2MP channel, specifically for querying the packet transport network device and the gateway device.
  • the tag is used to identify the point-to-multipoint P2MP channel, specifically for querying the packet transport network device and the gateway device.
  • the interaction module 42 is configured to push the broadcast group service received by the packet transport network device to the downlink base station.
  • the interaction between the packet transport network device and the downlink base station is performed by using a preset interaction protocol.
  • the preset interaction protocol is The IGMP protocol; the interaction module 42 uses the packet transport network device as an IGMP querier, and the packet transport network device and the downlink base station query the corresponding multicast service through the Internet group management protocol, according to the queried multicast The service pushes the corresponding multicast service to the downlink base station.
  • the packet transport network device queries the corresponding multicast service from the multicast service packet and sends the corresponding multicast service to the corresponding base station according to the service request of each of the connected base stations.
  • the interaction module 42 pushes the multicast service to the packet transport network device through the point-to-multipoint channel, specifically the gateway.
  • the device sends the multicast service to the access layer packet transport network device connected to the downlink base station through the point-to-multipoint P2MP channel.
  • the MBMS_GW receives the multicast traffic sent from the external server, it directly sends it to the PTN devices K1 and K2; after receiving the multicast service, K1 and K2 receive the next PTN device or The request sent by the base station performs the push of the multicast service.
  • K1 When receiving the service request of the base station, K1 queries the corresponding multicast service from the multicast service packet to the base station 1 according to the service request of the base station 1, and finally pushes the multicast service to the user equipment through the base station; When the multicast service request sent by the next layer of the PTN device is received, K1 sends all the received multicast services to the PTN device N1, and then N1 queries the corresponding multicast service from the multicast service according to the service request sent by the device connected to the N1, and finally the device receives the multicast service. Push to the user device.
  • the interaction module 42 pushes the multicast group service to the L3VPN through the P2MP channel through the gateway device.
  • Each of the two or three layers of the virtual network bridges the packet transport network device, and then pushes the multicast group service to the next access layer packet transport network device by using the two or three layers of the virtual network bridge packet transport network device.
  • the interaction process between the L3VPN and the MBMS_GW is the same as that in Figure 2.
  • the PTN devices M1 and M2 are respectively connected by the Layer 2 and Layer 3 virtual networks.
  • the broadcast traffic is delivered to the devices N1 and N2, and the device N1 is sent to the devices A, B, C, and D respectively.
  • the devices A, B, C, and D are used as IGMP queriers, and the downlink base stations are exchanged through the IGMP protocol.
  • it is implemented by VPLS or VPLS.
  • the interaction module 42 is configured to copy multiple multicast pages according to the preset number of pushes of the virtual local area network by the packet transport network device.
  • Traffic and respectively push the multicast service traffic to the corresponding multiple downlink base stations
  • the specific packet transport network device includes a packet transport network device for implementing Layer 2 and Layer 3 virtual network bridging, and other connected base stations.
  • the packet transport network device but regardless of which type of packet transport network device, there are cases where multiple base stations are connected, and then the received multicast service can be copied according to the request and then sent to the base station.
  • each module of the multicast service implementation apparatus 4 provided in FIG. 4 above may also be implemented by a processor, a receiving module, and a sending module.
  • the multicast service implementation of the packet transport network is implemented.
  • the implementation of the device can be:
  • the receiving module receives the multicast service sent from the server
  • the processor pushes the received multicast service to the packet transport network device through the P2MP channel, where the packet transport network device is used to push the base station to push the multicast service.
  • the processor performs protocol interaction with the downlink base station, and queries service multicast traffic corresponding to each base station, so as to implement push of the multicast service from the packet transport network device to the downlink base station. Send processing.
  • the receiving module 41 can be directly implemented by a home gateway supporting a P2MP channel
  • the interaction module 42 is implemented by using a PTN device
  • the interaction process is: the home gateway receives the multicast traffic to and from the server.
  • the P2MP channel is established with the PTN device of the access layer to send the multicast service to the PTN device of the access layer through the P2MP channel
  • the PTN device of the access layer serves as a querier, and interacts with the connected base station through the IGMP protocol to determine The multicast month that needs to be pushed.
  • the process of establishing a P2MP channel between the PTN device of the home gateway and the access layer is as follows:
  • Step 1 The processor queries the existing P2MPSwitch node and the multicast stream point between the PTN device and the PTN device.
  • This step is mainly used to determine whether a P2MPSwitch node corresponding to the multicast traffic exists. If it does not exist, the new node is added, and the newly created node is connected with the other P2MP Switch nodes, and the notification model is generated. Performing an update process on the node list; or determining whether a multicast stream point corresponding to the multicast traffic already exists, if not existing, creating a new one, and attaching the newly created node to the original other multicast stream point to have a sibling relationship.
  • the notification model performs update processing of the node list, where the model refers to a preset establishment node or a flow point establishment rule on the PTN device, and establishes a node or a flow point through a corresponding establishment rule. If yes, the multicast service interaction between the inbound and outbound LSP nodes and the inbound and outbound LSPs is performed.
  • Step 2 Create a new outgoing LSP node and an outgoing LSP flow point, attach a parent-child relationship, and attach a relationship between the lsp node and the physical port on the device according to the outgoing LSP port information, notify the model, notify the table generator, and the parent-child relationship here.
  • Step 2 Create a new outgoing LSP node and an outgoing LSP flow point, attach a parent-child relationship, and attach a relationship between the lsp node and the physical port on the device according to the outgoing LSP port information, notify the model, notify the table generator, and the parent-child relationship here. Refers to the relationship between nodes and flow points, there are multiple flow points under one node.
  • the inbound LSP node and the inbound LSP flow point need to be established, as shown in step 3.
  • Step 3 The non-root node newly establishes an inbound LSP node and an LSP flow point, attaches a parent-child relationship, and attaches a parent-child relationship between the LSP node and the port according to the information of the incoming LSP port, notifies the model, and notifies the table generator;
  • step 4 the parent-child relationship is connected to the LSP flow point and the multicast stream point, and the P2MPSwitch node and the multicast stream point are respectively connected to the LSP flow point, and the sibling relationship is notified to notify the model and notify the table generator;
  • Step 5 Configure related node attributes, notify the model, and notify the table generator.
  • the device for implementing the multicast service of the packet transport network further includes performing real-time detection on the P2MP channel to determine whether each channel does not perform multicast service interaction for a long time, and if so, performing a channel deletion step, as follows:
  • Step 1 Notifying the L3 multicast command processor to process, notify the model, and the notification table generator performs update processing of the node list.
  • Step 2 Release the multicast stream point index, notify the model, and notify the table generator to update the node list.
  • Step 3 Dissolve the relationship between the incoming LSP and the port, the relationship between the outgoing LSP and the port, the relationship between the outgoing LSP flow point and the multicast streaming point, and the relationship between the P2MPSwitch node and the multicast streaming point and the incoming LSP flow point.
  • the notification model, and the notification table generator performs update processing of the node list.
  • Step 4 Delete all nodes and flow points related to the P2MP, notify the model, and notify the lister to update the node list.
  • the P2MP channel is established between the home gateway and the PTN device at the access layer by using the above steps to facilitate the subsequent multicast service interaction. Add tags to the P2MP channel.
  • the specific steps are as follows:
  • Step a after receiving the command to add the P2MP channel label, query the label map, and process the storage of the label map;
  • Step b detecting that the corresponding channel label changes, signing the inbound label corresponding to the old channel as an invalid value, notifying the model, and the notification table generator updates the changed channel label;
  • Step c setting an inbound label of the P2MP channel, notifying the model, and notifying the table to perform update processing of the node list;
  • the label map is queried and the corresponding channel is deleted.
  • the embodiment of the present invention further provides a communication system, where the communication system includes the multicast service implementation device of the packet transport network, where the system pushes the multicast service through the P2MP channel. And to the packet transport network device, the packet transport network device is used as a querier, and performs protocol interaction with the downlink base station to implement push processing of the multicast service from the packet transport network device to the downlink base station.
  • the packet transport network device receives the multicast service sent by the gateway device by using the point-to-multipoint P2MP channel, and the packet transport network device passes The preset interaction protocol interacts with the connected base station to push the multicast service to the downlink base station.
  • the gateway directly pushes the received multicast service to the pre-set through the P2MP channel. In the process of the packet transport network device, only one service data is pushed, which greatly reduces the workload of the gateway interaction data, and also reduces the link setting between the gateway and the device, thereby reducing the waste of unnecessary resources.
  • the cost is reduced, the processing efficiency of the gateway data is improved, and then the packet transmission network separately performs protocol interaction with the downlink base station, thereby implementing one-by-one multicast service push, ensuring the accuracy of the service promotion, and effectively utilizing the system. Resources enable flexible control of multicast service push.
  • computer storage medium includes volatile and nonvolatile, implemented in any method or technology for storing information, such as computer readable instructions, data structures, program modules or other data. Sex, removable and non-removable media.
  • Computer storage media include, but are not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), and Electrically Erasable Programmable Read-only Memory (EEPROM). Flash or other memory technology, CD-ROM (CD-ROM, Compact Disc Read-Only Memory), digital versatile disc (DVD) or other optical disc storage, magnetic box, magnetic tape, magnetic disk storage or other magnetic storage device, or any other medium that can be used to store desired information and that can be accessed by a computer.
  • communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and can include any information delivery media. .
  • the embodiment of the invention provides a method for implementing a multicast service of a packet transmission network, a device thereof, and a communication system.
  • the gateway device directly pushes the received multicast service to a preset packet transmission network device through a P2MP channel.
  • only one push of service data is needed, which greatly reduces the amount of data sent by the gateway, and also reduces the link setting between the gateway and the device, reduces the waste of unnecessary resources, and improves the processing efficiency of the gateway data.
  • the packet transmission network separately performs protocol interaction with the downlink base station to ensure the accuracy of the service promotion, and also effectively utilizes the system resources, thereby implementing flexible control of the multicast service push.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

L'invention concerne également un procédé de mise en œuvre d'un service de multidiffusion d'un réseau de transmission de paquets, un dispositif associé et un système de communication. Un dispositif de réseau de transmission de paquets reçoit un service de multidiffusion transmis par un dispositif de passerelle au moyen d'un canal point à multipoint (P2MP), et le dispositif de réseau de transmission de paquets pousse le service de multidiffusion vers une station de base de liaison descendante.
PCT/CN2017/116631 2016-12-15 2017-12-15 Procédé de mise en œuvre d'un service de multidiffusion d'un réseau de transmission de paquets, dispositif associé et système de communication WO2018108168A1 (fr)

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CN201611160764.2 2016-12-15
CN201611160764.2A CN108235259B (zh) 2016-12-15 2016-12-15 分组传送网的组播业务实现方法及其装置、通信系统

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WO2018108168A1 true WO2018108168A1 (fr) 2018-06-21

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