WO2021097858A1 - Procédé et appareil de communication - Google Patents

Procédé et appareil de communication Download PDF

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Publication number
WO2021097858A1
WO2021097858A1 PCT/CN2019/120440 CN2019120440W WO2021097858A1 WO 2021097858 A1 WO2021097858 A1 WO 2021097858A1 CN 2019120440 W CN2019120440 W CN 2019120440W WO 2021097858 A1 WO2021097858 A1 WO 2021097858A1
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WIPO (PCT)
Prior art keywords
access network
network device
terminal device
radio access
drb
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PCT/CN2019/120440
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English (en)
Chinese (zh)
Inventor
罗海燕
曾清海
戴明增
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/120440 priority Critical patent/WO2021097858A1/fr
Priority to CN201980102426.9A priority patent/CN114731723A/zh
Publication of WO2021097858A1 publication Critical patent/WO2021097858A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and device.
  • PDU packet data unit
  • UE user equipment
  • DN data network
  • a terminal when data is transmitted between terminals, a terminal first forwards the user plane data to the radio access network device through the air interface, and the radio access network device then forwards the user plane data to the user plane function (UPF), UPF then forwards the data to the data network unit (DN), DN then forwards the data to UPF, and UPF then forwards the data to the wireless access network device, and the wireless access network device finally forwards the data to another through the air interface
  • UPF user plane function
  • DN data network unit
  • the present application provides a communication method and device to solve the problem of redundancy in the transmission process when user plane data is transmitted between terminals.
  • the present application provides a communication method for realizing the establishment of DRB.
  • the method includes: a radio access network device receives an establishment request message from a terminal device, the establishment request message is used to request the establishment of a DRB, wherein the establishment request message includes a parameter for establishing the DRB, and the radio access network device according to the parameter Determine the QoS parameters of DRB. Then the radio access network device sends an establishment response message to the terminal device, where the establishment response message is used to indicate that the DRB is successfully established.
  • the terminals on both sides of the communication can establish DRB with the connected radio access network device according to the above method, so as to realize the user plane data at the access network.
  • the data is forwarded directly.
  • the base station, and the base station sends data to the receiving terminal, which can reduce the time delay of data transmission, reduce the load and resource overhead of the core network, and reduce data transmission redundancy.
  • the wireless access network device before the wireless access network device receives the first message from the terminal device, the wireless access network device also sends a message to the terminal device.
  • the message is used to instruct the wireless access network device to support data direct Forward.
  • the terminal device sends the establishment request message requesting the establishment of the DRB to the radio access network device. In order to realize that the user plane data can be directly forwarded at the device supporting the wireless access network.
  • the radio access network device may obtain the QoS parameter corresponding to the parameter used to determine the DRB from the core network device in advance.
  • the parameter used to determine the DRB may include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, QFI, QoS index information, or QoS parameters.
  • the base station obtains the QoS parameters corresponding to the network slice identifier or the UE group identifier from the core network device in advance, so that the base station can guarantee the QoS requirements of the data during the user plane data transmission process.
  • this application provides a communication method, including: a terminal device sends an establishment request message to a radio access network device, the establishment request message is used to request the establishment of a DRB, and the establishment request message includes parameters for establishing the DRB , The radio access network device determines the QoS parameter of the DRB according to the parameter. Then the radio access network device sends an establishment response message to the terminal device, where the establishment response message is used to indicate that the DRB is successfully established.
  • the terminals on both sides of the communication can establish DRB with the connected radio access network device according to the above method. , So as to facilitate the direct forwarding of user plane data at the access network.
  • the terminal device may receive a message from the radio access network device in advance, and the message is used to indicate that the radio access network device supports direct data forwarding.
  • the message may be an RRC message or a broadcast message.
  • the radio access network device that supports direct data forwarding sends its own area ID (area ID) to the core network device in advance, and then the core network device sends the area ID of the radio access network device to the terminal device through a NAS message. In this way, the terminal device can determine whether the wireless access network device supports direct data forwarding according to the area ID broadcast by the wireless access network device.
  • the terminal device may obtain the correspondence between the QoS parameter and the parameter used to determine the DRB from the core network device in advance.
  • the parameter used to determine the DRB may include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, QFI, QoS index information, or QoS parameters.
  • the core network device informs the terminal device of the mapping relationship between QoS index information and QoS parameters in advance through a NAS message, and the terminal device determines the corresponding QoS index information according to the QoS parameters corresponding to the service, and carries the QoS index in the establishment request message Information so that the base station can determine the QoS parameters corresponding to the QoS index information, so that the base station can guarantee the QoS requirements of the data during the user plane data transmission process.
  • the present application provides a communication method, which is used to realize the transmission of user plane data between terminals.
  • the method is applied to a communication system including a wireless access network device, a first terminal device, and a second terminal device, wherein the first terminal device and the second terminal device both access the wireless access network device.
  • the method includes: a wireless access network device receives user plane data sent by a first terminal device through a first DRB, where the user plane data is sent by the first terminal device to the second terminal device.
  • the user plane data includes the identification of the second terminal device.
  • the radio access network device determines the second DRB according to the identifier of the second terminal device, and then directly forwards the user plane data to the second terminal device through the second DRB.
  • the radio access network device can forward the user plane data sent by the first terminal on the first DRB to the second DRB, and send the user plane data to the second terminal in the second DRB, so as to achieve The data at the access network is forwarded directly.
  • the radio access network device can forward the user plane data sent by the first terminal on the first DRB to the second DRB, and send the user plane data to the second terminal in the second DRB, so as to achieve The data at the access network is forwarded directly.
  • the radio access network device can forward the user plane data sent by the first terminal on the first DRB to the second DRB, and send the user plane data to the second terminal in the second DRB, so as to achieve The data at the access network is forwarded directly.
  • the first terminal can send the data to the wireless access network device, and then the wireless access network device forwards it to the second
  • the embodiment of the present application can reduce the number of hops in the data transmission process, thereby reducing the time delay of data transmission, reducing the load and resource overhead of the core network, and reducing data transmission redundancy.
  • the radio access network device may send the first terminal device and the second terminal device, and the core The network device sends a third message, which may be an RRC message or a broadcast message, and the third message is used to indicate that user plane data can be directly forwarded at the radio access network device.
  • the radio access network device can establish a direct data forwarding channel, that is, a DRB, so that the accuracy of establishing a direct data forwarding channel can be improved, and the accuracy of direct data forwarding at the access network can be improved.
  • the user plane data further includes parameters for determining the second DRB; the radio access network device determines the second DRB according to the identification and parameters of the terminal.
  • the parameters used to determine the second DRB include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, a flow identifier QFI of a quality of service data stream, QoS index information, or QoS parameters.
  • the base station determines the DRB corresponding to the network slice ID or the UE group ID, so that the base station can transmit user plane data on the second DRB, which can improve the accuracy of establishing a direct data forwarding channel, and thus can improve the directness of data at the access network. The accuracy of forwarding.
  • the radio access network device before sending the user plane data to the second terminal device, deletes the identifier of the second terminal device in the user plane data, or deletes the identifier and parameters of the second terminal device , And then send the processed user plane data to the second terminal device, which can save air interface overhead.
  • the first terminal device before the wireless access network device receives the user plane data sent by the first terminal device through the first DRB, the first terminal device sends the establishment request message for requesting the establishment of the first DRB to the wireless access device After determining the first DRB and the first QoS parameter, the radio access network device further sends a first establishment response message to the first terminal device, where the first establishment response message is used to indicate that the first DRB is successfully established.
  • the second terminal device also sends an establishment request message for requesting the establishment of the second DRB to the wireless access device. After determining the second DRB and the second QoS parameters, the wireless access network device also sends the first terminal device to the first terminal device. 2. An establishment response message, where the second establishment response message is used to indicate that the second DRB is successfully established.
  • the wireless access network device may obtain the parameters used to determine the DRB from the core network device in advance. Corresponding QoS parameters.
  • the parameter used to determine the DRB may include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, QFI, QoS index information, or QoS parameters.
  • the base station obtains the QoS parameters corresponding to the network slice identifier or the UE group identifier from the core network device in advance, so that the base station can guarantee the QoS requirements of the data during the user plane data transmission process.
  • the terminals on both sides of the communication can establish DRB with the connected radio access network device according to the above method, so as to realize the user plane data at the access network.
  • the data is forwarded directly.
  • the base station, and the base station sends data to the receiving terminal, which can reduce the time delay of data transmission, reduce the load and resource overhead of the core network, and reduce data transmission redundancy.
  • the NAS layer of the terminal device triggers the RRC layer to send an establishment request message to the radio access network device.
  • the establishment request message may be an RRC message, and the establishment request message is used to request the establishment of a DRB.
  • the RRC layer of the first terminal device and the RRC layer of the second terminal device may both send the RRC message requesting the establishment of the DRB to the radio access network device.
  • the present application provides a communication method, which is used to realize the transmission of user plane data between terminals.
  • the method is applied to a communication system including a first wireless access network device, a second wireless access network device, a first terminal device, and a second terminal device, wherein the first terminal device accesses the first wireless access network Device, the second terminal device accesses the second wireless access network device.
  • the method includes: a first radio access network device receives user plane data sent by a first terminal device through a first DRB, the user plane data is sent by the first terminal device to the second terminal device, and the user plane data includes the second terminal device.
  • the identification of the terminal device According to the identifier, the first wireless access network device determines that the second terminal device is connected to the second wireless access network device. Therefore, the first wireless access network device sends the user plane data to the second wireless access network device.
  • the data when user plane data is transmitted between terminals under different radio access network devices, the data can be directly transmitted between the two radio access network devices without being forwarded by the core network device, thereby reducing data transmission. Hop count and delay, reduce core network resources and signaling overhead.
  • the first radio access network device before the first radio access network device receives the user plane data sent by the first terminal device through the first DRB, the first radio access network device needs to establish the first DRB in advance. Specifically, the first radio access network device receives a request message sent by the first terminal device, where the request message is used to request the establishment of the first DRB; the first radio access network device sends a request response to the first terminal device Message, the request response message is used to indicate that the first DRB is successfully established, where the first DRB corresponds to the first QoS parameter.
  • the NAS layer of the terminal device triggers the RRC layer to send an establishment request message to the radio access network device.
  • the establishment request message may be an RRC message, and the establishment request message is used to request the establishment of a DRB.
  • the RRC layer of the first terminal device may send the RRC message requesting the establishment of the DRB to the radio access network device.
  • the first wireless access network device may send a message to the first terminal device and the second terminal device.
  • the device and the core network device send a first message.
  • the first message may be an RRC message or a broadcast message.
  • the first message is used to indicate that the user plane data can be directly connected to the data at the first radio access network device.
  • the first radio access network device can establish a direct data forwarding channel, that is, a DRB, so that the accuracy of establishing a direct data forwarding channel can be improved, and the accuracy of direct data forwarding at the access network can be improved.
  • the first radio access network device may delete the identifier or parameter in the user plane data before sending it To the second radio access network device, for example, the base station deletes the network slice identifier and the identifier of the second terminal device included in the user plane data, and then sends the deleted user plane data to the second terminal device. This can save air interface overhead.
  • the first radio access network device when the first radio access network device sends user plane data to the second radio access network device through the user plane GPRS tunnel protocol, the first radio access network device is in the GTP-U message
  • the header carries the identifier of the second terminal device (for example, IP address, UE group ID, slice ID, or QFI information), so that the second radio access network device can route to the second terminal device according to the information carried in the header of the GTP-U message Terminal equipment, at the same time to achieve the purpose of saving air interface overhead.
  • the present application provides a communication method, which is used to realize the transmission of user plane data between terminals.
  • the method is applied to a communication system including a first wireless access network device, a second wireless access network device, a first terminal device, and a second terminal device, wherein the first terminal device accesses the first wireless access network Device, the second terminal device accesses the second wireless access network device.
  • the method includes: a second radio access network device receives user plane data from a first radio access network device, the user plane data is data sent by the first terminal device to the second terminal device, and the user plane data includes the second terminal The identification of the device; the second radio access network device determines the second DRB according to the identification of the second terminal device, and then the second radio access network device sends the user plane data to the second terminal device through the second DRB.
  • the data when user plane data is transmitted between terminals under different radio access network devices, the data can be directly transmitted between the two radio access network devices without being forwarded by the core network device, thereby reducing data transmission. Hop count and delay, reduce core network resources and signaling overhead.
  • the user plane data further includes parameters used to determine the second DRB; the second radio access network device determines the second DRB according to the identification and parameters of the terminal.
  • the parameters used to determine the second DRB include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, a flow identifier QFI of a quality of service data stream, QoS index information, or QoS parameters.
  • the base station determines the DRB corresponding to the network slice ID or the UE group ID, so that the base station can transmit user plane data on the second DRB, which can improve the accuracy of establishing a direct data forwarding channel, and thus can improve the directness of data at the access network. The accuracy of forwarding.
  • the second wireless access network device may report to the first terminal device and the second terminal device, And the core network device sends a first message, which may be an RRC message or a broadcast message, and the first message is used to indicate that user plane data can be directly forwarded at the first radio access network device.
  • the first radio access network device can establish a direct data forwarding channel, that is, a DRB, so that the accuracy of establishing a direct data forwarding channel can be improved, and the accuracy of direct data forwarding at the access network can be improved.
  • the second radio access network device may obtain the QoS parameter corresponding to the parameter used to determine the second DRB from the core network device in advance.
  • the parameter used to determine the DRB may include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, QFI, QoS index information, or QoS parameters.
  • the base station obtains the QoS parameters corresponding to the network slice identifier or the UE group identifier from the core network device in advance, so that the base station can guarantee the QoS requirements of the data during the user plane data transmission process.
  • the present application provides a communication method, which is used to realize the transmission of user plane data between terminals.
  • the method can be applied to a communication system including a wireless access network device, a first terminal device, and a second terminal device, wherein the first terminal device and the second terminal device both access the wireless access network device.
  • the method includes: the wireless access network device sends a notification message to the core network device, where the notification message is used to instruct the wireless access network device to support direct data forwarding.
  • the core network device determines that the user plane data of the first terminal device can be forwarded to the second terminal device at the wireless access network device, the core network device sends instruction information to the wireless access network device, and the instruction information is used to indicate the first terminal device.
  • the first PDU session of the terminal device and the second PDU session of the second terminal device can directly forward data at the radio access network device.
  • the first terminal device is connected to Enter the first wireless access network device, and the second terminal device accesses the second wireless access network device.
  • the radio access network device in the foregoing method may be the first radio access network device or the second radio access network device.
  • the core network device may determine that the wireless access network device supports direct data forwarding according to the notification message sent by the wireless access network device.
  • the core network device instructs the wireless access network device to establish the data directly for the first PDU session of the first terminal and the second PDU session of the second terminal.
  • a forwarding channel so that the radio access network device can forward the user plane data sent by the first terminal on the resources of the first PDU session to the resources of the second PDU session on the direct data forwarding channel, and send it to the resources of the second PDU session.
  • the user plane data is sent to the second terminal on the resources of the session, so that the data at the access network can be directly forwarded.
  • the embodiment of the present application can reduce the number of hops in the data transmission process, thereby reducing the time delay of data transmission, reducing the load and resource overhead of the core network, and reducing data transmission redundancy.
  • the core network device sends the mapping relationship between the QoS index information and the QoS parameter to the terminal device through the NAS message, which helps the terminal device to carry the QoS parameter when initiating the PDU session, and solves the problem of the core network device. There may not be the above mapping relationship.
  • the second terminal device may be a terminal device group, that is, the first terminal device sends user plane data to the terminal device group, so that when the first terminal device initiates a PDU session, the PDU session is established
  • the request may include the group identification of the terminal group.
  • the wireless access network device After the wireless access network device receives the PDU session establishment instruction including the terminal group identifier sent by the core network device, the wireless access network device broadcasts the multicast channel configuration parameters corresponding to the terminal group identifier. After the wireless access network devices receive the user plane data, they perform multicasting in the multicast channel.
  • the embodiment of the present application provides a mechanism for triggering a radio access network device to perform multicast.
  • the present application provides a communication device.
  • the communication device may be a communication device, or a chip or chipset in the communication device.
  • the communication device may be a wireless access network device, a core network device, or a terminal device.
  • the device may include a processing unit and a transceiving unit.
  • the processing unit may be a processor or a communication interface; the device may also include a storage unit, and the storage unit may be a memory; the storage unit is used to store instructions, and the processing unit executes all instructions of the storage unit.
  • the processing unit can be a processor, and the transceiver unit can be an input/output interface, a pin or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to Make the radio access network device perform the corresponding function in the first aspect or the fifth aspect or the sixth aspect, or make the core network device perform the corresponding function in the second or sixth aspect described above, or make the terminal device perform the first aspect described above.
  • the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip or a chipset, or may be a storage unit in the communication device A storage unit (for example, read-only memory, random access memory, etc.) located outside the chip or chipset.
  • a storage unit for example, a register, a cache, etc.
  • a storage unit for example, read-only memory, random access memory, etc. located outside the chip or chipset.
  • this application provides a wireless access network device, including a processor, a communication interface, and a memory.
  • the communication interface is used to transmit information, and/or messages, and/or data between the device and other devices.
  • the memory is used to store computer-executable instructions.
  • the processor executes the computer-executable instructions stored in the memory, so that the device executes the method according to the first aspect or any one of the first aspects. Or the method of any one of the above third aspect or the third aspect, or the method of any one of the above fourth aspect or the fourth aspect, or the method of any one of the above fifth or fifth aspects .
  • this application provides a core network device, including a processor, a communication interface, and a memory.
  • the communication interface is used to transmit information, and/or messages, and/or data between the device and other devices.
  • the memory is used to store computer-executable instructions.
  • the processor executes the computer-executable instructions stored in the memory, so that the device executes the method according to any one of the sixth aspect or the sixth aspect.
  • this application provides a terminal device, including a processor, a transceiver, and a memory.
  • the transceiver is used to transmit information, and/or messages, and/or data between the device and other devices.
  • the memory is used to store computer-executable instructions, and when the device is running, the processor executes the computer-executable instructions stored in the memory, so that the device executes the method according to any one of the second aspect or the second aspect.
  • the present application also provides a computer-readable storage medium that stores instructions in the computer-readable storage medium, which when run on a computer, causes the computer to execute the methods described in the above aspects.
  • this application also provides a computer program product including instructions, which when run on a computer, causes the computer to execute the methods described in the above aspects.
  • the embodiments of the present application also provide a chip system.
  • the chip system includes a processor and may also include a memory for implementing any possible design of the first aspect, the first aspect, the second aspect, or the second aspect. Any possible design method of the aspect, any possible design method of the third aspect or the third aspect, any possible design method of the fourth aspect or the fourth aspect, any possible design of the fifth aspect or the fifth aspect The method of design, the sixth aspect, or any possible design method of the sixth aspect.
  • the chip system can be composed of chips, or it can include chips and other discrete devices.
  • FIG. 1 is a schematic diagram of a user plane data routing path of a radio access network device based on a centralized architecture provided by an embodiment of the application;
  • FIG. 2 is a schematic diagram of the architecture of a communication system provided by an embodiment of this application.
  • FIG. 3 is a schematic diagram of a connection relationship between an AMF/UPF and a radio access network device according to an embodiment of the application;
  • 4A is a schematic structural diagram of a radio access network device divided into CU and DU according to an embodiment of the application;
  • 4B is a schematic diagram of a connection relationship between CU, DU, 5GC, and other wireless access network equipment provided by an embodiment of this application;
  • 5A is a schematic structural diagram of a radio access network device divided into CU-CP, CU-UP, and DU according to an embodiment of the application;
  • FIG. 5B is a schematic structural diagram of a radio access network device divided into IAB node and IAB donor according to an embodiment of the application;
  • FIG. 6 is a schematic diagram of a PDU session establishment process and a data transmission process for UE1 to send user plane data to UE2 according to an embodiment of the application;
  • FIG. 7 is a schematic diagram of a user plane data routing path of a radio access network device based on the CU-CP, CU-UP, and DU architecture provided by an embodiment of the application;
  • FIGS. 8A and 8B are schematic diagrams of the architecture of a communication system provided by an embodiment of this application.
  • FIG. 9 is a schematic flowchart of a communication method for implementing DRB establishment according to an embodiment of the application.
  • FIG. 10 is a schematic flowchart of a data transmission method provided by an embodiment of this application.
  • FIG. 11 is a schematic diagram of a protocol stack of a terminal device and an access network device provided by an embodiment of this application;
  • FIG. 12 is a schematic flowchart of another data transmission method provided by an embodiment of this application.
  • FIGS. 13A and 13B are schematic diagrams of protocol stacks of another terminal device and access network device provided by an embodiment of this application;
  • FIG. 14 is a schematic diagram of a process of establishing a direct data forwarding channel provided by an embodiment of the application.
  • 15 is a schematic diagram of another process of establishing a direct data forwarding channel provided by an embodiment of the application.
  • 16 is a schematic diagram of another process of establishing a direct data forwarding channel provided by an embodiment of the application.
  • FIG. 17 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 18 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 19 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 20 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 21 is a schematic structural diagram of a terminal device provided by an embodiment of this application.
  • FIG. 22 is a schematic structural diagram of an access network device provided by an embodiment of this application.
  • the embodiments of this application provide a communication method, which can be applied to a 5G (fifth generation mobile communication system) system, such as an access network using new radio access technology (New RAT); cloud wireless access Access to the network (cloud radio access network, CRAN) and other communication systems.
  • a 5G system can be a non-roaming scene or a roaming scene.
  • the 5G system can be used for a service-oriented architecture or an interface-based architecture, which is not specifically limited here. It should be understood that the embodiments of the present application may also be applicable to future communications (for example, 6G or other networks).
  • the architecture of the communication system to which the communication method provided in the embodiments of the present application is applicable may include network opening function network elements, policy control function network elements, data management network elements, application function network elements, core network access and mobility management function network elements. , Session management function network element, terminal equipment, wireless access network equipment, user plane function network element and data network. Core network access and mobility management function network elements and terminal equipment can be connected through N1 interface, core network access and mobility management function network elements and wireless access network equipment can be connected through N2 interface, wireless access Network equipment and user plane function network elements can be connected through N3 interface, session management function network elements and user plane function network elements can be connected through N4 interface, user plane function network elements and data network can be connected through N6 interface , For example, as shown in Figure 2.
  • the network elements in the communication system may, but are not limited to, the network elements in the 5G architecture.
  • the terminal equipment which may also be referred to as user equipment (UE), mobile station (MS), mobile terminal (MT), etc.
  • UE user equipment
  • MS mobile station
  • MT mobile terminal
  • the terminal device may include a handheld device with a wireless connection function, a vehicle-mounted device, and the like.
  • the terminal devices may be: mobile phones (mobile phones), tablet computers, notebook computers, handheld computers, mobile Internet devices (MID), wearable devices, virtual reality (VR) devices, augmented Augmented reality (AR) equipment, wireless terminals in industrial control (industrial control), wireless terminals in self-driving (self-driving), wireless terminals in remote medical surgery, and smart grid (smart grid) Wireless terminals in ), wireless terminals in transportation safety, wireless terminals in smart cities, or wireless terminals in smart homes, etc.
  • MID mobile Internet devices
  • VR virtual reality
  • AR augmented Augmented reality
  • Wireless terminals in wireless terminals in industrial control (industrial control), wireless terminals in self-driving (self-driving), wireless terminals in remote medical surgery, and smart grid (smart grid) Wireless terminals in ), wireless terminals in transportation safety, wireless terminals in smart cities, or wireless terminals in smart homes, etc.
  • the wireless access network device may be an access network (access network, AN), which provides wireless access services to the terminal device.
  • the wireless access network device is a device that connects the terminal device to a wireless network in the communication system.
  • the radio access network device is a node in a radio access network, which may also be called a base station, or may also be called a radio access network (RAN) node (or device).
  • the radio access network device may be a 5G base station (next generation NodeB, gNB), or may also be a next generation evolved NodeB (ng-eNB).
  • the data network such as a data network (DN) may be the Internet, an IP Multi-media Service (IMS) network, a regional network (ie a local network, such as a mobile edge computing (mobile edge computing) computing, MEC) network) and so on.
  • the data network includes an application server, and the application server provides business services for the terminal device by performing data transmission with the terminal device.
  • IMS IP Multi-media Service
  • MEC mobile edge computing
  • the core network access and mobility management function network element can be used to manage the access control and mobility of the terminal device. In practical applications, it includes the long term evolution (LTE) network
  • LTE long term evolution
  • the mobility management function in the mobility management entity (MME) in the framework and the access management function is added, which can be specifically responsible for the registration of the terminal equipment, mobility management, tracking area update process, reachability detection, Session management function network element selection, mobile state transition management, etc.
  • the core network access and mobility management function network element may be an AMF (access and mobility management function) network element.
  • the core network access and mobility management function network elements may still be AMF network elements or have other names, which are not limited by this application.
  • the core network access and mobility management function network element is an AMF network element, the AMF may provide Namf service.
  • the user plane function network element can be used for packet routing and forwarding, supporting uplink classifiers to route service flows to instances of data networks, and supporting branch points to support multi-homed packet data unit (PDU) sessions , User plane quality of service (quality of service, QoS) processing, downlink data packet buffering, and downlink data notification triggering, etc.
  • PDU packet data unit
  • User plane quality of service quality of service, QoS
  • the user plane function network element may be a UPF (user plane function) network element.
  • future communications such as 6G
  • the user plane function network element may still be a UPF network element, or there may be other The name is not limited in this application.
  • the session management function network element can be used to be responsible for the session management of the terminal device (including the establishment, modification and release of the session), the selection and reselection of the user plane function network element, and the internet protocol of the terminal device. , IP) address allocation, QoS control, etc.
  • the session management function network element may be an SMF (session management function) network element.
  • SMF session management function
  • future communications such as 6G
  • the session management function network element may still be an SMF network element, or there may be other The name is not limited in this application.
  • the SMF can provide the Nsmf service.
  • the policy control function network element can be used to be responsible for policy control decision-making, to provide functions such as service data flow and application detection, gating control, QoS, and flow-based charging control.
  • the policy control function network element may be a PCF (policy control function) network element.
  • the policy control function network element may still be a PCF network element, or there may be other The name is not limited in this application.
  • the PCF network element may provide the Npcf service.
  • the main function of the application function network element is to interact with the 3rd generation partnership project (3GPP) core network to provide services to influence service flow routing, access network capability opening, policy control, etc.
  • 3GPP 3rd generation partnership project
  • the application function network element may be an AF (application function) network element.
  • the application function network element may still be an AF network element or have other names.
  • the application is not limited.
  • the AF network element may provide Naf services.
  • the data management network element may be used to manage subscription data of the terminal device, registration information related to the terminal device, and the like.
  • the data management network element may be a unified data management network element (unified data management, UDM).
  • UDM unified data management network element
  • future communications such as 6G
  • the data management network element may still be a UDM network element, or Other names are not limited in this application.
  • the UDM network element may provide Nudm services.
  • the network open function network element can be used to enable 3GPP to safely provide network service capabilities to third-party AF (for example, Service Capability Server (SCS), Application Server (AS), etc.).
  • third-party AF for example, Service Capability Server (SCS), Application Server (AS), etc.
  • the network opening function network element may be NEF (network exposure function).
  • NEF network exposure function
  • future communications such as 6G
  • the network opening function network element may still be a NEF network element or have other names. This application is not limited.
  • the NEF can provide Nnef services to other network function network elements.
  • system architecture can also include other network elements, such as network slice selection function (NSSF), network function storage function (NF repository function, NRF), authentication server function network element (authentication server function, AUSF) Wait, I won't list them all here.
  • NSSF network slice selection function
  • NF repository function NF repository function
  • NRF authentication server function network element
  • AUSF authentication server function
  • Each of the above network elements can also be called functional entities, which can be network elements implemented on dedicated hardware, software instances running on dedicated hardware, or instances of virtualized functions on an appropriate platform, for example, the above
  • the virtualization platform may be a cloud platform.
  • the interface between AMF/UPF and wireless access network equipment is NG port (NG-C/NG-U port), and different wireless access network equipment is connected through Xn port.
  • NG-C/NG-U port The interface between AMF/UPF and wireless access network equipment
  • Xn port The interface between AMF/UPF and wireless access network equipment
  • the radio access network device as a gNB or ng-eNB as an example, the connection relationship between the AMF/UPF and the radio access network device, as well as different AMF/UPF and the radio access network device may be as shown in FIG. 3.
  • the radio access network device in the embodiment of the present application may split the radio access network device into two parts according to the protocol stack function: a centralized unit (CU) and a distributed unit (DU) , Can also be called gNB-CU and gNB-DU respectively.
  • one radio access network device may include one CU and at least one DU, as shown in FIG. 4A.
  • the CU is connected to at least one DU and can be used to manage or control the at least one DU.
  • This structure can disassemble the protocol layer of the wireless access network equipment in the communication system, in which part of the protocol layer functions are implemented in the CU, and the remaining part or all of the protocol layer functions are distributed in the DU, and the CU centrally controls the DU.
  • the protocol layer of gNB includes the radio resource control (radio resource control, RRC) layer, the service data adaptation protocol (SDAP) layer, and the packet data aggregation protocol (packet data).
  • the convergence protocol (PDCP) layer the radio link control (RLC) layer, the media access control sublayer (media access control, MAC) layer, and the physical layer.
  • the CU may be used to implement the functions of the RRC layer, the SDAP layer, and the PDCP layer
  • the DU may be used to implement the functions of the RLC layer, the MAC layer, and the physical layer.
  • the embodiment of the present application does not specifically limit the protocol stack included in the CU and DU.
  • CU and DU can be connected by F1 interface
  • CU and other wireless access network equipment can be connected by Xn interface
  • CU and 5G core network (5G Core, 5GC) can be connected by NG interface, as shown in Figure 4B.
  • the CU in the embodiment of the present application may be further divided into a control plane (CU-control plane, CU-CP) network element and at least one user plane (CU-user plane, CU-UP) network element.
  • CU-CP can be used for control plane management
  • CU-UP can be used for user plane data transmission.
  • the interface between CU-CP and CU-UP can be an E1 port.
  • the interface between CU-CP and DU can be F1-C, which is used for the transmission of control plane signaling.
  • the interface between CU-UP and DU can be F1-U, which is used for user plane data transmission.
  • CU-UP and CU-UP can be connected through the Xn-U port for user plane data transmission.
  • the structure of gNB may be as shown in FIG. 5A.
  • the connection relationship between the IAB node and the IAB donor (IABdonor), as well as the CN and the UE may be as shown in FIG. 5B.
  • the IAB node IAB node
  • the donor may also be called a donor node (donor node) or a donor base station (DgNB, Donor gNodeB).
  • the IAB node can be composed of an MT (mobile termination, mobile terminal) part and a DU (distributed unit, DU) part.
  • MT mobile termination, mobile terminal
  • DU distributed unit
  • the donor base station DgNB can be an access network element with complete base station functions, or it can be an access network element in the form of a centralized unit (CU) and a distributed unit (DU) separated form, the donor base station Connect to the core network (for example, connected to the 5G core network, 5GC) network element serving the UE, and provide the wireless backhaul function for the IAB node.
  • CU centralized unit
  • DU distributed unit
  • UE1 Before sending user plane data to UE2, UE1 sends a PDU session establishment request to gNB, where the PDU session establishment request is used to request establishment of PDU session 1 of UE1.
  • S602 The gNB forwards the PDU session establishment request sent by the UE1 to the AMF.
  • core network elements such as AMF, UPF, and DN allocate core network resources (for example, uplink user plane data channel address, etc.) for PDU session 1.
  • core network resources for example, uplink user plane data channel address, etc.
  • the AMF sends a PDU session establishment response to the gNB to notify the gNB core network element of the core network resources allocated for the PDU session 1.
  • the gNB allocates resources for PDU session 1, such as configuring service data adaptation protocol (service data adaptation) for one or more data radio bearers (DRB) of PDU session 1.
  • service data adaptation service data adaptation protocol
  • SDAP Secure Digital
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC Medium Access Control
  • PHY Physical layer
  • the gNB sends relevant configuration parameters to UE1, and the relevant configuration parameters are parameters of resources allocated by the gNB for PDU session 1.
  • UE1 configures the corresponding DRB based on the received parameters, for example, configures SDAP layer, PDCP layer, RLC layer, MAC layer, and PHY layer entities for each DRB.
  • the PDU session 1 from UE1 to DN is successfully established.
  • UE1 transmits the user plane data to be sent to UE2 on the resource of PDU session 1, the user plane data is sent to the gNB via the air interface, the gNB sends the user plane data to the UPF, and the UPF sends the data to the DN.
  • the DN parses out the destination node (UE2) of the user plane data. If the PDU session 2 for receiving the user plane data of the UE2 has not been established, step S609 is executed. Among them, UE2 can be in a connected state or in an idle state. Further, if the UE2 is in an idle state, before performing step S609, the core network device and the radio access network device may initiate paging in sequence, and the UE2 receives the paging and establishes an RRC connection with the gNB.
  • the DN triggers the AMF to establish the PDU session 2, allocates core network resources for the PDU session 2, and sends a PDU session establishment request to the gNB.
  • the PDU session establishment request is used to request the establishment of the PDU session 2.
  • the gNB After receiving the UE2PDU session establishment request from AMF, the gNB allocates resources for PDU session 2, such as configuring service data adaptation protocol for one or more data radio bearers (DRB) of PDU session 2.
  • SDAP Secure Digital Protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC Medium Access Control
  • PHY Physical layer
  • the gNB sends relevant configuration parameters to UE2, and the relevant configuration parameters are parameters of resources allocated by the gNB for PDU session 2.
  • UE2 configures corresponding DRBs based on the received parameters, for example, configures SDAP layer, PDCP layer, RLC layer, MAC layer, and PHY layer entities for each DRB.
  • the DN transmits the user plane data to be sent to UE2 on the resources of the PDU session 2.
  • the DN can parse out the destination node (UE2) of the user plane data, and route the user plane data to the UPF related to the UE2 on the resource of the PDU session 2 for receiving the user plane data of the UE2.
  • the UPF routes the user plane data from UE1 to the gNB according to the downlink user plane channel of the established PDU session 2, and the gNB then forwards it to UE2.
  • the process of establishing a PDU session is a process of configuring core network resources and access network resources for user plane data transmission.
  • the establishment of a PDU session involves multiple network elements from the UE to the DN.
  • UE1 first enters PDU session 1.
  • the user plane data is sent to the gNB on the resources of the PDU, and the gNB forwards the user plane data on the resources of PDU session 1 to UPF.
  • UPF then forwards the user plane data on the resources of PDU session 1 to the DN.
  • the DN then forwards the user plane data on the resources of PDU session 1.
  • the data is forwarded to UPF on the resources of PDU session 2, and UPF then forwards the user plane data on the resources of PDU session 2 to gNB, and gNB finally forwards the user plane data on the resources of PDU session 2 to UE2, as shown in Figure 1. Show.
  • gNB-DU1 forwards the user plane data to gNB-CU or gNB-CU-UP
  • gNB-CU or gNB-CU-UP then forwards the user plane data to UPF on the resources of PDU session 1
  • UPF then forwards the user plane The data is forwarded to the DN on the resources of PDU session 1.
  • the DN then forwards the user plane data on the resources of PDU session 2 to UPF, and UPF forwards the user plane data on the resources of PDU session 2 to gNB-CU or gNB-CU-UP, gNB-CU or gNB-CU- UP forwards the data to gNB-DU2, and gNB-DU2 finally forwards the user plane data to UE2 on the resources of PDU session 2, as shown in Figure 7.
  • the user data of the terminal needs to be sent to the DN and then forwarded back to the wireless access network by the DN.
  • the access network then sends the user plane data to the destination terminal, which increases the number of hops and delays in data transmission, increases the load and resource overhead of the core network, and has data transmission redundancy.
  • the present application provides a communication method and device to solve the problem of redundancy in the transmission process when two terminal devices perform user plane data transmission in the prior art, which causes a large transmission delay.
  • the method and the device are based on the same inventive concept. Since the principles of the method and the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • FIG. 8A is a communication system applicable to the embodiment of this application.
  • the communication system shown in FIG. 8A includes a core network device (5GC), a radio access network device (RAN), UE1 and UE2.
  • 5GC core network device
  • RAN radio access network device
  • UE1 and UE2 Assume that Node-X in the radio access network equipment supports direct data forwarding, that is, data is no longer sent to core network elements, DN, etc., but Node-X directly sends data from UE1 to UE2.
  • Node-X may refer to a base station (gNB), as shown in (a) in FIG. 8A.
  • gNB base station
  • Node-X may refer to DU, as shown in (b) in FIG. 8A.
  • Node-X can refer to the IAB node of the IAB architecture.
  • the radio access network device After the radio access network device receives the user plane data of UE1, it can forward the user plane data to UE2 at the radio access network device through the direct data forwarding channel. It can be seen that when UE1 When accessing the same radio access network device as UE2, the user plane data of UE1 can be forwarded without passing through core network elements, DN, etc., which can reduce the number of hops in data transmission, thereby reducing data transmission delay and data The redundancy of the transmission process can also reduce the load and resource overhead of the core network.
  • FIG. 8B is a communication system applicable to the embodiment of this application.
  • the communication system shown in FIG. 8B includes a core network device (5GC), a first wireless access network device, and a second wireless access network device. , UE1 and UE2.
  • 5GC core network device
  • UE1 and UE2 UE2 and UE2.
  • Node-X in the first radio access network device and the second radio access network device supports direct data forwarding, that is, the data is no longer sent to the core network element, DN, etc., but the data from UE1 is directly sent to UE2 .
  • Node-X may refer to base stations (gNB1 and gNB2), as shown in (a) in FIG. 8B.
  • the data of UE1 is sent to UE2 through gNB1 and gNB2, that is, UE1->gNB1->gNB2->UE2.
  • a user plane tunnel for data forwarding is pre-established between gNB1 and gNB2.
  • Node-X can refer to DU1 and DU2 shown in (b) in Figure 8B, or can refer to DU1 and DU2 in Figure 8B (c) DU1 and DU2 shown.
  • the data of UE1 passes through DU1, the common CU (or CU1->CU2), and then is forwarded to UE2 through DU2, namely UE1->DU1->CU->DU2->UE2.
  • the data of UE1 passes through DU1, CU1, CU2, and then forwards to UE2 through DU2, that is, UE1->DU1->CU1->CU2->DU2->UE2.
  • Node-X may also refer to IAB nodes of the IAB architecture
  • Node-X may refer to IAB node1 and IAB node2 shown in (d) in FIG. 8B, or may refer to (e ) Shows IAB node1 and IAB node2.
  • the data of UE1 passes through IAB node1, IABdonor, and then forwards to UE2 through IAB node2, that is, UE1->IAB node1->IAB Dornor->IAB node2->UE2.
  • the data of UE1 passes through IAB node1, IAB donor1, IAB donor2, and then forwards to UE2 through IAB node2, namely UE1->IAB node1->IAB Dornor1->IAB Dornor2->IAB node2 ->UE2.
  • FIG. 8A and FIG. 8B Some scenarios in the embodiments of this application are illustrated by taking the wireless communication networks shown in FIG. 8A and FIG. 8B as examples. It should be noted that the solutions in the embodiments of this application can also be applied to other wireless communication networks, and the corresponding names are also It can be replaced by the names of corresponding functions in other wireless communication networks.
  • FIG. 9 it is a schematic flowchart of a communication method provided by an embodiment of this application.
  • the method includes:
  • Step 901 The terminal device sends an establishment request message to the radio access network device.
  • the establishment request message is used to request the establishment of a DRB.
  • the establishment request message includes a first parameter for determining the DRB.
  • DRB is a dedicated DRB used for direct data forwarding.
  • the so-called dedicated DRB for direct data forwarding means that the sending-side terminal device sends user plane data to the wireless access network device through the DRB between the sending-side terminal device and the wireless access network device, and the wireless access network device will communicate with the wireless access network device.
  • the DRB between the terminal devices on the receiving side sends the user plane data to the terminal device on the receiving side.
  • the terminal device may request the establishment of the DRB through an existing RRC message, or may use a newly defined RRC message to request the establishment of the DRB.
  • the terminal device may carry indication information used to indicate that the DRB is used for direct data forwarding in the establishment request message (for example, an uplink RRC message).
  • the RRC message may be a message generated by the RRC layer triggered by the non-access stratum (NAS) of the terminal device. That is, the NAS layer of the terminal device sends a first instruction to the lower layer, that is, the RRC layer, and the first instruction is used to notify the RRC layer to apply to the radio access network device to establish a DRB. After receiving the first instruction, the RRC layer generates an uplink RRC message, and sends the RRC message to the radio access network device.
  • NAS non-access stratum
  • the first parameter used to determine the DRB may include one or more of the following information: network slice ID (slice ID), UE group ID to which the UE belongs, quality of service (QoS) parameters, QoS index (quality of service index), QFI, indication information used to indicate that the DRB is used for direct data forwarding. Therefore, the radio access network device can determine the DRB corresponding to the first parameter.
  • network slice ID slice ID
  • UE group ID to which the UE belongs
  • QoS quality of service
  • QoS index quality of service index
  • QFI indication information used to indicate that the DRB is used for direct data forwarding. Therefore, the radio access network device can determine the DRB corresponding to the first parameter.
  • the core network device may notify the terminal device of the mapping relationship between the QoS parameter and the QoS index, or the mapping relationship between the QoS parameter and the QFI in advance through a NAS message.
  • the core network device includes the foregoing mapping relationship in the registration acceptance message sent to the terminal device.
  • the terminal device uses the mapping relationship to determine the QoS index corresponding to the QoS parameters of the service, and reports the QoS index or QFI to the radio access network device in the establishment request message.
  • Step 902 The radio access network device determines a QoS parameter according to the first parameter used to determine the DRB, where the QoS parameter corresponds to the DRB.
  • the above method may further include step 904.
  • the core network device for example, AMF
  • the core network device may pre-determine the mapping relationship between QoS parameters and QoS index, or the mapping relationship between QoS parameters and QFI, It is notified to the wireless access network device through the interface between the AMF and the wireless access network device (for example, the NG interface).
  • the radio access network device can determine the corresponding QoS parameter according to the QoS index, so as to ensure the QoS requirements of terminal services during the data transmission process.
  • the above method may further include step 905: the wireless access device reports to the core network device that it supports direct data forwarding, or requests the core network device for the mapping relationship between QoS parameters and QoS index/QFI.
  • Step 903 The radio access network device sends an establishment response message to the terminal device, where the establishment response message is used to indicate that the DRB is successfully established.
  • the establishment response message may include DRB configuration information, for example, including one or more of the following information: DRB identification, logical channel identification, PDCP configuration information, SDAP configuration information, RLC configuration information, MAC configuration information, PHY configuration information Wait.
  • the terminal device may also determine that the wireless access network device supports data direct through any one or more of the following methods. Forwarding, that is, supporting the establishment of a dedicated DRB for direct data forwarding.
  • the radio access network device broadcasts whether it supports direct data forwarding.
  • the radio access network device carries indication information indicating that it supports direct data forwarding (local switch supported) in a system message (such as MIB or SIB1).
  • indication information indicating that it supports direct data forwarding (local switch supported) in a system message (such as MIB or SIB1).
  • the indication information one possible form is to define the new cell as local switch supported. When the cell is included, it means that the direct data forwarding is supported, and when the cell is not included, it means that the direct data forwarding is not supported.
  • Another possible form is to define the new cell as a local switch. When the value of this cell is true or 1, it means that direct data forwarding is supported, and when the value of this cell is false or 0, it means that direct data forwarding is not supported.
  • Method 2 After the terminal device is connected to the wireless access network device, the wireless access network device sends indication information to the terminal device through an RRC message, indicating whether the direct data forwarding is supported. For example, the wireless access network device can reconfigure the message in the RRC It contains local switch supported cell or local switch cell.
  • the radio access network equipment notifies the core network equipment to support direct data forwarding.
  • the radio access network equipment includes the local switch supported cell or local switch cell in the NG interface setup request (NG setup request) or RAN configuration update message.
  • the core network device sends instruction information to the terminal device, and the instruction information is used to indicate whether the wireless access network device supports direct data forwarding.
  • a core network device such as AMF
  • the NAS message only carries the identification of the radio access network device that supports local switch, such as the newly added cell local switch supported cell or local switch supported gNB.
  • each radio access network device has a unique corresponding Area ID (physical area identifier), and when the radio access network device notifies the core network device to support direct data forwarding, the Area ID may also be carried.
  • the core network device may send indication information to the terminal device through a NAS message, where the indication information is used to indicate the Area ID that supports direct data forwarding.
  • the NAS message contains the Area ID and the corresponding local switch supported cell or local switch cell. Or, only the area ID that supports local switch is carried in the NAS message, for example, the newly added cell local switch supported area.
  • the terminal device can determine whether the radio access network device supports direct data forwarding according to the Area ID.
  • the Area ID can also be replaced with a radio access network device identification list or a cell identification list.
  • QoS parameters have a corresponding relationship with QoS data streams.
  • a certain QoS data stream corresponds to a certain QoS requirement, and the QoS requirement is reflected in the form of QoS parameters.
  • the QoS parameters of the above-mentioned QoS data stream may include the following parameters: (1), 5G QoS Class Identifier (5QI); (2), Allocation and Retention Priority (ARP); (3), Guaranteed Flow Bit Rate (Guaranteed Flow Bit Rate, GFBR); (4), Maximum Flow Bit Rate (Maximum Flow Bit Rate, MFBR).
  • the above 5QI may specifically include: guaranteed rate (Guaranteed Bit Rate, GBR) or non-guaranteed rate (non-GBR) type information, priority level (Priority Level), packet delay budget (Packet Delay Budget), and packet error rate (Packet Error Rate).
  • GBR Guarantee Bit Rate
  • non-GBR non-guaranteed rate
  • QFI packet error rate
  • the radio access network device may subsequently map multiple QoS data streams in a network slice to one DRB or multiple DRBs.
  • DRB and QoS data flow have a one-to-one or one-to-many mapping relationship. That is, the radio access network device may include the mapping relationship between slice ID, DRB ID, and QFI in the RRC reconfiguration message to the terminal device, or directly give the mapping relationship between slice ID and DRB ID.
  • the first terminal device can establish the first DRB with the radio access network device according to the above method, and the second terminal device can also Establish a second DRB with the radio access network device according to the foregoing method.
  • the first terminal device and the second terminal device can implement user plane data transmission based on the first DRB and the second DRB.
  • Scenario 1 The first terminal device and the second terminal device are both within the coverage of the same wireless access network device.
  • FIG. 10 it is a schematic flowchart of a first data transmission method provided by an embodiment of this application. Referring to Figure 10, the method includes the following steps.
  • Step 1001 The radio access network device receives user plane data sent by the first terminal device through the first DRB.
  • the user plane data includes the first identifier of the second terminal device.
  • the first identifier of the second terminal device is used by the wireless access network device to determine whether the second terminal device is within its coverage area.
  • the first identifier of the second terminal device may be an IP address, a MAC address, or an identifier of the second terminal device in the terminal device group.
  • the first identifier may be a unique identifier such as an employee ID in a private network or an enterprise network, an employee code in a private network or an enterprise network, or the first identifier of the second terminal device may also be a unique identifier of the second terminal device.
  • the terminal device after the terminal device is connected to the wireless access network device, it will report its first identifier, such as an IP/MAC address or its identifier in the terminal device group, to the wireless access network device.
  • the radio access network device assigns the terminal device a second identifier of the terminal device in the radio access network device, such as a cell radio network temporary identifier (C-RNTI). Therefore, the radio access network device obtains the mapping relationship between the first identifier and the second identifier of the terminal device.
  • the radio access network device receives the user plane data, it can determine the second identifier corresponding to the first identifier according to the first identifier, so as to determine whether the second terminal device is within its coverage area according to the second identifier.
  • the radio access network device subsequently forwards the user plane data, it scrambles the user plane data according to the second identifier of the second terminal device.
  • Step 1002 The radio access network device directly forwards user plane data to the second terminal device through the second DRB, where both the first terminal device and the second terminal device access the radio access network device.
  • a first DRB may be pre-established between the first terminal device and the radio access network device, and a second DRB may be pre-established between the second terminal device and the radio access network device.
  • a first DRB may be pre-established between the first terminal device and the radio access network device
  • a second DRB may be pre-established between the second terminal device and the radio access network device.
  • the first DRB and the second DRB are the same DRB on the radio access network device side, that is, the radio access network device determines that the corresponding default bearer is the first DRB according to the identifier of the second terminal device. A DRB. Therefore, the radio access network device directly forwards the user plane data of the first terminal device to the second terminal device in the first DRB.
  • the first DRB and the second DRB are different DRBs on the radio access network device side.
  • the user plane data in step 1001 may also include a second parameter for determining the second DRB.
  • the radio access network device determines the second DRB according to the identifier of the second terminal device and the second parameter.
  • the second parameter used to determine the second DRB may include a network slice identifier (for example, slice ID), a group identifier (ue group ID) where the first terminal device is located, a flow identifier (QFI) of the quality of service data flow, One or more of the address of the first terminal device or the identifier of the first terminal device.
  • the wireless access network device can first determine the second terminal device according to the first identifier of the second terminal device. The terminal device then determines the second DRB of the second terminal device corresponding to the second parameter contained in the user plane data, such as the slice ID. Or determine the second DRB corresponding to the QFI identifier and the mapping relationship between the QFI identifier and the DRB identifier.
  • the second terminal device is currently in an RRC idle state or an RRC inactive state.
  • the radio access network device sends a paging message, and the paging message carries the first identifier of the second terminal device.
  • the second terminal device accesses the wireless access network device, and the wireless access network device notifies the second terminal device to establish the second DRB, and the notification message includes the configuration information of the second DRB.
  • the radio access network device may forward the user plane data to the second terminal device through the second DRB.
  • the wireless access network device may send the user The identifier and the second parameter in the plane data are deleted, and the deleted user plane data is sent to the second terminal device, which can save air interface overhead.
  • the routing layer at the radio access network device in FIG. 11 and the routing layer on the second terminal device side can be deleted during the data transmission process, which can save air interface overhead.
  • the actions performed by the radio access network device in the method shown in FIG. 10 may specifically be Implemented by gNB.
  • the gNB receives user plane data sent by the first terminal device through the first DRB.
  • Step 1002 The gNB directly forwards the user plane data to the second terminal device through the second DRB, where both the first terminal device and the second terminal device access the gNB.
  • the actions performed by the radio access network device in the method shown in FIG. 10 may be specifically executed by the gNB-DU.
  • the gNB-DU receives the first terminal device sent by the first DRB.
  • User plane data the gNB-DU directly forwards the user plane data to the second terminal device through the second DRB, where both the first terminal device and the second terminal device access the gNB-DU.
  • the action performed by the radio access network device in the method shown in FIG. 10 may specifically be performed by the IABnode.
  • the IAB node receives user plane data sent by the first terminal device through the first DRB.
  • the IAB node directly forwards user plane data to the second terminal device through the second DRB, where both the first terminal device and the second terminal device are connected to the IAB node.
  • the first terminal device and the second terminal device are respectively in the coverage areas of different radio access network devices.
  • the first terminal accesses the first wireless access network device (for example, gNB1)
  • the second terminal accesses the second wireless access network device (for example, gNB2) within the coverage of the first wireless access network device.
  • the coverage area of the second wireless access network device as shown in (a) in FIG. 8B.
  • FIG. 12 it is a schematic flow chart of the second data transmission method provided by an embodiment of this application. Referring to Figure 12, the method includes the following steps.
  • Step 1201 The radio access network device receives user plane data sent by the first terminal device through the first DRB, where the user plane data includes the first identifier of the second terminal device.
  • step S1001 For details, please refer to step S1001, which will not be repeated here.
  • Step 1202 The first wireless access network device determines that the second terminal device is connected to the second wireless access network device according to the first identifier.
  • the first wireless access network device may only be able to determine that the second terminal device corresponding to the first identifier is not covered by the first wireless access network device based on the first identifier. Within the range of, the first radio access network device then sends the user plane data carrying the first identifier to the adjacent access network device, and obtains the second terminal corresponding to the first identifier from the adjacent access network device The device is within the coverage area of the second wireless access device.
  • the first wireless access network device may determine the second terminal device in any one or more of the following ways The terminal device accesses the second wireless access network device.
  • the first wireless access network device determines that there is no terminal device corresponding to the first identifier. For example, if the first identifier or the second identifier corresponding to the first identifier cannot be found, the first wireless access network device determines The second terminal device is not within its coverage area. Therefore, the first wireless access device sends an inquiry message to the wireless access network device in the neighboring cell. The inquiry message includes the first identification of the second terminal device. After the affirmative reply from the networked device, it is determined that the second terminal device is connected to the second wireless access network device, that is, the second terminal device is within the coverage of the second wireless access network device.
  • Each terminal device may send its own first identifier (such as an IP address, MAC address, or the identifier of the UE in the UE group, etc.) to the core network device in advance.
  • the UE informs the AMF of its own first identifier through a registration message.
  • the core network device sends the mapping relationship between the first identification of the terminal device and the wireless access network device (base station or cell) to each wireless access network device, that is, the wireless access network device can learn the first identification of the terminal device and the wireless access network device.
  • the mapping relationship of networked devices are examples of networked devices.
  • the first wireless access network device determines that the second terminal device is not within the coverage area, it can determine that the second terminal device accesses the second wireless access device according to the mapping relationship between the first identifier of the second terminal device and the wireless access network device. Network access equipment.
  • Method 3 After each terminal device is connected to the wireless access network device, the wireless access network device and the neighboring wireless access device exchange the first identification of the terminal device it is serving (for example, IP address, MAC address, or UE in The identification in the UE group, etc.), each radio access network device saves the mapping relationship between the identification of the terminal device and the radio access device (base station or cell). Therefore, when the first wireless access network device determines that the second terminal device is not within the coverage area, it can determine that the second terminal device is connected to the second terminal device according to the mapping relationship between the first identifier of the second terminal device and the wireless access network device. Wireless access network equipment.
  • the first identification of the terminal device it is serving for example, IP address, MAC address, or UE in The identification in the UE group, etc.
  • each radio access network device saves the mapping relationship between the identification of the terminal device and the radio access device (base station or cell). Therefore, when the first wireless access network device determines that the second terminal device is not within the coverage area, it can determine that the second terminal
  • the first radio access network device can trigger the RAN paging message , That is, the first radio access network device initiates a RAN paging message, and at the same time sends RAN paging messages to other radio access network devices through the interface between radio access network devices, so that other radio access network devices initiate RAN on the air interface Paging. Subsequently, when the second terminal device enters the connected state (connected) in the second wireless access network device, and the second wireless access network device notifies the first wireless access network device of the situation, the first wireless access network device can determine The second terminal device accesses the second wireless access network device.
  • the first radio access network device When the first radio access network device cannot determine which radio access network device is covered by the second terminal device, the first radio access network device forwards the user plane data to which an interface is established (Such as Xn interface) other second wireless access network equipment.
  • the first radio access network device sends the user plane data to the second radio access network device through a user plane tunnel (GPRS Tunnel Protocol User plane, GTP-U) between it and the second radio access network device.
  • GTP-U GPRS Tunnel Protocol User plane
  • the first radio access network device sends the user plane data to the second radio access network device through the GTP-U tunnel between it and the second radio access network device, and the user plane data is not Contains the first identifier of the second terminal device, but also does not contain the second parameter.
  • the first identifier and/or the second parameter of the second terminal are included in the GTP-U packet header.
  • the second radio access network device After the second radio access network device receives the user plane data, it determines whether it is within its own coverage area according to the first identifier of the second terminal device, and if not, discards the data packet. If yes, send the user plane data to the second terminal device.
  • Step 1203 The first radio access network device sends user plane data to the second radio access network device.
  • the first radio access network device and the second radio access network device may establish a dedicated user plane tunnel for direct data forwarding through the Xn interface in advance, so that the first radio access network device transmits to the user plane tunnel through the user plane tunnel.
  • the second radio access network device sends the user plane data, so that the second radio access network device forwards the user plane data to the second terminal device.
  • the user plane tunnel establishment process may occur in the Xn interface establishment or interface configuration update process between wireless access devices. For example, if there is an Xn interface between the radio access network device 1 and the radio access network device 2, then the Xn setup request initiated by the radio access network device 1 may include the user plane of the radio access network device 1.
  • Transport layer such as IP address and tunnel endpoint identity (TEID)
  • radio access network device 2 can include the radio access network device 2 side user plane in the Xn setup response (Xn interface establishment response request) message Transport layer information.
  • the user plane tunnel for direct data forwarding may be node-granular, that is, there is only one user between the first radio access network device and the second radio access network device Face tunnel.
  • the user plane tunnel for direct data forwarding may also be UE group granular, that is, each terminal device is between the first radio access network device and the second radio access network device. The group has established a corresponding user plane tunnel.
  • the user plane tunnel used for direct data forwarding may also be slice (network slicing) granularity, that is, between the first radio access network device and the second radio access network device is every A slice (network slice) establishes a corresponding user plane tunnel.
  • the first radio access network device needs to indicate the UE group ID or slice ID when providing user plane data, so that the second radio access network device can determine which user plane data belongs to UE group, or which slice it belongs to.
  • the first radio access network device determines that the second terminal device is within the coverage of the second radio access network device
  • the first radio access network device sends the data packet to the second radio access network device through the user plane tunnel.
  • the second radio access network device may determine that the user plane tunnel is used for direct data forwarding according to the TEID carried in the GTP-U header.
  • the second radio access network device can determine which UE group the user plane tunnel corresponds to according to the TEID carried in the GTP-U header, and is used to perform data for the UEs in the UE group Forward directly.
  • the second radio access network device can determine which network slice the user plane tunnel corresponds to according to the TEID carried in the GTP-U header, and use it to perform operations for the UE working in the network slice. Data is forwarded directly.
  • the first radio access network device may delete the first identifier and the second parameter in the user plane data, and then enter the GPRS user plane tunneling protocol (GPRS tunneling protocol user, GTP-U) header
  • GPRS tunneling protocol user GTP-U
  • the part carries the first identifier and the second parameter of the second terminal device, and then sends the processed data packet of the user plane data to the second terminal device, which can save air interface overhead.
  • Step 1204 The second radio access network device forwards the user plane data to the second terminal device through the second DRB.
  • a first DRB can be pre-established between the first terminal device and the first radio access network device, and a second DRB can be pre-established between the second terminal device and the second radio access network device.
  • DRB Exemplarily, for the process of establishing the first DRB and the second DRB, refer to steps 901 to 903 in the DRB establishment process shown in FIG. 9 for details, and details are not repeated here.
  • the first DRB and the second DRB may be the same DRB on the radio access network device side, that is, the second radio access network device determines the corresponding default DRB according to the identifier of the second terminal device.
  • the bearer is the first DRB. Therefore, the second radio access network device forwards the user plane data of the first terminal device to the second terminal device in the first DRB.
  • the first DRB and the second DRB may be different DRBs on the radio access network device side.
  • the user plane data in step 1201 may also include a second parameter for determining the second DRB.
  • the radio access network device determines the second DRB according to the identifier of the second terminal device and the second parameter.
  • the parameters used to determine the second DRB may include the network slice ID (for example, slice ID), the group ID of the first terminal device (ue group ID), the flow ID of the quality of service data flow (QFI), and the source node One or more of addresses or logos. Because the second terminal device is connected to the second wireless access network device, that is, the second terminal device is within the coverage of the second wireless access network device, the second wireless access network device can be based on the first wireless access network device contained in the user plane data.
  • the second parameter such as the slice ID, determines the second DRB corresponding to it. Or determine the second DRB corresponding to the QFI identifier and the mapping relationship between the QFI identifier and the DRB identifier.
  • the second terminal device when the second terminal device is accessing the second wireless access network device, it will send its own first identifier (for example, IP address, MAC address, etc.) to the second wireless access device. In this way, the second wireless access network device can determine the correspondence between the first identifier of the terminal and the terminal device.
  • first identifier for example, IP address, MAC address, etc.
  • the data when user plane data is transmitted between terminal devices under different wireless access network devices, the data can be transmitted directly between the two wireless access devices without being forwarded by the core network device, thereby reducing data transmission hops. Data and delay, reduce core network resources and signaling overhead.
  • the actions performed by the first radio access network device in the method shown in FIG. 12 are specific It may be executed by gNB1, and the action executed by the second radio access network device may be specifically executed by gNB2.
  • gNB1 receives user plane data from the first terminal device.
  • gNB1 sends user plane data to gNB2.
  • Step 1204 The gNB2 forwards the user plane data to the second terminal device through the second DRB.
  • the action performed by the first radio access network device in the method shown in FIG. 12 may be specifically performed by gNB-DU1, and the action performed by the second radio access network device may specifically be performed by gNB-DU2. carried out.
  • gNB-DU1 receives user plane data from the first terminal device.
  • gNB-DU1 sends user plane data to gNB-DU2.
  • Step 1204 The gNB-DU2 forwards the user plane data to the second terminal device through the second DRB.
  • the action performed by the first radio access network device in the method shown in FIG. 12 may be specifically performed by IAB node1, and the action performed by the second radio access network device may specifically be performed by IAB node1.
  • IAB node1 receives user plane data from the first terminal device.
  • IAB node1 sends user plane data to IAB node2.
  • IAB node2 forwards the user plane data to the second terminal device through the second DRB.
  • the first radio access network device and the second radio access network device may have different functionally separated architectures.
  • both the first wireless access network device and the second wireless access network device may have a centralized architecture; alternatively, the first wireless access network device may have the architecture shown in FIG. 4A or FIG. 5A, and the second wireless access network device may have the architecture shown in FIG. 4A or FIG. 5A.
  • the network access device may be a centralized architecture; or, the first wireless access network device may be a centralized architecture, and the second wireless access network device may be an architecture as shown in FIG. 4A or FIG. 5A; or, the first wireless access network device may be the architecture shown in FIG. 4A or FIG.
  • Both the access network device and the second wireless access network device may have the architecture shown in FIG. 4A; alternatively, both the first wireless access network device and the second wireless access network device may have the architecture shown in FIG. 5A; Also or alternatively, the first radio access network device may be the architecture shown in FIG. 4A, and the second radio access network device may be the architecture shown in FIG. 5A; or, the first radio access network device may be such as In the architecture shown in FIG. 5A, the second radio access network device may be the architecture shown in FIG. 4A, and so on.
  • This application provides a data transmission method and device.
  • the user plane data of the terminal device may not be forwarded through the core network network element, DN, etc., but directly forwarded by the wireless access network device.
  • the method can reduce data
  • the number of transmission hops can further reduce the time delay of data transmission, reduce the redundancy of the data transmission process, and can also reduce the load and resource overhead of the core network.
  • the method and the device are based on the same inventive concept. Since the principles of the method and the device to solve the problem are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • the radio access network device then processes the data through SDAP-PDCP and RLC-MAC-PHY, and then passes The air interface forwards the data to UE2.
  • FIG. 13A shows a situation where the RAN side includes a full protocol stack, that is, both receiving and sending on the RAN side include the SDAP-PDCP-RLC-MAC-PHY layer, which can be understood as layer 3 forwarding, that is, L3 forwarding.
  • the data transmission method provided in the embodiments of this application is also applicable to the case where the RAN side only contains part of the protocol stack.
  • the end-to-end PDCP protocol layer is responsible for data encryption and decryption, header compression and decompression, sorting and re-sorting and other functions. That is, there is only the RLC-MAC-PHY layer between Tx and Node-X, and between Node-X and Rx.
  • Node-X can be gNB or gNB-DU or IAB node.
  • the radio access network device is a centralized architecture as an example to describe in detail the process of establishing a direct data forwarding channel.
  • the process of establishing a direct data forwarding channel can be shown in Figure 14.
  • UE1 ie, the first terminal device
  • PDU session 1 ie, the first PDU session
  • step S601 the process of establishing the PDU session 1 can be specifically referred to step S601 to step S607 in the PDU session establishment process shown in FIG. 6, which will not be repeated here.
  • the radio access network device i.e., gNB in the figure
  • the indication message includes a local switch supported cell or a local switch cell.
  • S1402 may also occur before S1401, that is, the indication information is carried in the message sent when the interface is established or updated.
  • the gNB may indicate in the NG setup request (NG interface establishment request) message whether it supports direct data forwarding.
  • the gNB may additionally inform the core network device itself whether it supports direct forwarding of L3 layer data or L2 layer data direct forwarding.
  • AMF needs to provide additional keys related to Tx/Rx pairs for Tx-Rx end-to-end PDCP for encryption and decryption.
  • the L3/L2 layer data direct forwarding instruction is also applicable to the IAB architecture or CU-DU architecture mentioned below.
  • the direct forwarding of L3/L2 layer data is stipulated by the protocol. For example, the protocol stipulates the direct forwarding method of L3 layer data, or the direct forwarding method of L2 layer data, then the gNB does not need to additionally indicate the AMF information.
  • the core network device determines, according to the instruction information, that UE1 and UE2 (that is, the second terminal device) can directly forward data at the radio access network device (gNB).
  • gNB radio access network device
  • UE1 can send the identity or address of the destination node (ie, the identity or address of UE2) to the core network device or DN on the resources of PDU session 1, so that the core network device or DN can determine that UE1 and UE2 can perform at the gNB. Data is forwarded directly.
  • the destination node ie, the identity or address of UE2
  • the AMF sends a PDU Session Resource Setup Request to the gNB.
  • the PDU Session Resource Setup Request is used to request the gNB to allocate resources for UE2’s PDU Session 2 (ie PDU Session 2) so that UE2 can receive User plane data of UE1.
  • the core network element and the gNB can initiate paging in sequence.
  • UE2 receives the page and establishes an RRC connection with the gNB.
  • the PDU session resource setting request signaling can carry first information to inform the gNB that the PDU session 2 established for UE2 is related to which PDU session of UE1 or other terminals
  • the gNB establishes a direct transmission channel for PDU sessions that can directly forward data at the access network according to the association relationship (for example, the association relationship shows that UE2’s PDU session 2 and UE1’s PDU session 1 can directly forward data, then gNB Establish a direct data forwarding channel for PDU session 1 and PDU session 2) for direct data forwarding.
  • the PDU session resource setting request carries the PDU session identifier (PDU Session ID) and the QoS Flow list included in the corresponding PDU session (PDU Session) and other parameters.
  • PDU Session ID PDU session identifier
  • PDU Session QoS Flow list included in the corresponding PDU session
  • one or more information elements namely the first information
  • the session forwards data directly at the access network.
  • one or more indication information elements (Indication), that is, second information, are added to the PDU session resource setting request to indicate whether the radio access network device should perform access on the resources of the second PDU session of UE2.
  • the data at the network is forwarded directly.
  • the core network may not retain the uplink user plane channel information allocated for the PDU session 1.
  • the core network can also retain the uplink user plane channel information allocated for PDU session 1, so that when UE1 and UE2 fail to directly forward data at gNB, The user plane data of UE1 can be forwarded to UE2 via gNB-core network element-DN-core network element-gNB, so as to improve the success rate of data transmission.
  • the uplink user plane channel information (NG UL UP Transport Layer Information) of the PDU session can include but is not limited to: user plane transport layer information (UP Transport Layer Information), transport layer address (Transport Layer Address), GPRS tunnel protocol-tunnel Endpoint identifier (GPRS tunnelling protocol-tunnel endpoint identifier, GTP-TEID) and so on.
  • the user plane transport layer information is used to provide the user plane transport layer information associated with the PDU session between the wireless access network device and the UPF, which can specifically correspond to the internet protocol (IP) address and the GTP tunnel endpoint identifier symbol.
  • IP internet protocol
  • the transport layer address can be an IP address.
  • GTP-TEID may be the GTP tunnel endpoint identifier for the user plane transmission between the radio access network device and the UPF.
  • the gNB After receiving the PDU session resource setting request, the gNB configures PDU session resources for PDU session 2. For example, gNB configures the SDAP layer entity, PDCP layer entity, MAC layer entity, and RLC layer at the access network for the DRB of PDU session 2. The entity, the PHY layer entity, allocates downlink user plane channel information (including the port IP address at the gNB, GTP-TEID, etc.) for the PDU session 2. It should be understood that it is not excluded that the gNB does not reconfigure the SDAP layer entity, PDCP layer entity, MAC layer entity, RLC layer entity, etc. at the access network for the DRB of PDU session 2.
  • the DRB of PDU session 2 can share the SDAP layer entity, PDCP layer entity, and MAC at the access network of the DRB of PDU session 1.
  • Layer entity, RLC layer entity, etc. the gNB may allocate the same SDAP layer entity, PDCP layer entity, MAC layer entity, RLC layer entity, etc., to the DRB of PDU session 2 and the DRB of PDU session 1.
  • the gNB may allocate resources such as SDAP layer entity, PDCP layer entity, MAC layer entity, and RLC layer entity at the access network of the DRB of PDU session 1 to the DRB of PDU session 2.
  • the gNB sends RRC Connection Reconfiguration signaling to UE2.
  • the RRC Connection Reconfiguration signaling can carry the parameters of the PDU session resource configured by the gNB for PDU session 2 (such as SDAP parameters, PDCP parameters, MAC parameters, RLC parameters, PHY layer parameters, etc.), indication information.
  • the indication information may include the first information, or may include the first information and the second information.
  • UE2 After UE2 receives the RRC Connection Reconfiguration signaling, it configures PDU session resources for PDU session 2 (for example, UE2 configures the configuration of the DRB's SDAP, PDCP, and MAC entities at the terminal for PDU session 2) .
  • UE2 After the configuration is completed, UE2 sends the RRC Connection Reconfiguration Complete signaling to the gNB to feedback the completion of the PDU session resource configuration to the gNB, and waits to receive the data sent by the UE1 directly transmitted by the gNB according to the instructions. .
  • the gNB sends a PDU Session Resource Setup Response (PDU Session Resource Setup Response) signaling to the AMF to feed back the completion of the PDU session resource configuration to the AMF.
  • PDU Session Resource Setup Response PDU Session Resource Setup Response
  • the gNB may not feed back the downlink user plane channel information (NG-UDL UP Transport Layer Information) allocated for the PDU session 2 to the AMF.
  • the gNB can feed back the downlink user plane channel information allocated for PDU session 2 to the AMF. Therefore, when UE1 and UE2 fail to directly forward data at the gNB, the user plane data of UE1 can be forwarded to UE2 via gNB-core network element-DN-core network element-gNB, and then forwarded by gNB to UE2, so as to improve data transmission. Success rate.
  • S1410 Core network elements (such as AMF, UPF, etc.) update instruction information.
  • the AMF can release the uplink user plane channel information (NG UL UP Transport Layer Information) of the corresponding NG port allocated for the PDU session 1.
  • the AMF may not release the uplink user plane channel information (NG UL UP Transport Layer Information) of the corresponding NG port allocated for the PDU session 1.
  • the user plane data of UE1 can be forwarded to UE2 via gNB-core network element-DN-core network element-gNB, and then forwarded by gNB to UE2, so as to improve data transmission. Success rate.
  • the AMF sends a PDU Session Resource Modify Request (PDU Session Resource Modify Request) to the gNB.
  • the PDU Session Resource Modify Request may carry updated indication information.
  • the gNB can change the PDU session resources that have been configured at the gNB according to the updated indication information.
  • the gNB sends an RRC connection reconfiguration (RRC Connection Reconfiguration) to the UE1, and the RRC connection reconfiguration may carry updated indication information.
  • RRC Connection Reconfiguration RRC Connection Reconfiguration
  • UE1 sends an RRC Connection Reconfiguration Complete (RRC Connection Reconfiguration Complete) to gNB, notifying gNB that UE1 has received updated indication information.
  • RRC Connection Reconfiguration Complete RRC Connection Reconfiguration Complete
  • UE1 After UE1 receives the instruction information, it can send data to UE2 through gNB according to the instruction information. Exemplarily, when UE1 sends user plane data to UE2 through gNB, it does not need to add UE2's header to the header of the user plane data sent. An identification and/or a second parameter. In this way, the complexity of UE1's data package can be reduced, thereby reducing the time delay of data transmission.
  • the gNB sends a PDU Session Resource Modify Response (PDU Session Resource Modify Response) to the AMF.
  • PDU Session Resource Modify Response PDU Session Resource Modify Response
  • the IAB node sends indication information to the IAB donor.
  • the indication information is used to indicate whether the IAB node supports local switch (direct data forwarding).
  • the IAB node can be in and The IAB donor sends the indication information when the connection is established, or, for example, the IAB node may send the indication information in msg1/msg3/msg5 or subsequent UL RRC messages. Exemplarily, as shown in Table 1.
  • gNB-DU informs gNB-CU whether it supports direct data forwarding. For example, gNB-DU can notify when establishing F1 interface with gNB-CU (e.g. F1 setup request message), the indication information (for example, gNB-DU Configuration Update message) can also be sent when the configuration is updated.
  • F1 setup request message e.g. F1 setup request message
  • the indication information for example, gNB-DU Configuration Update message
  • Scenario 1 The first terminal device and the second terminal device are within the coverage area of the same wireless access network device.
  • the establishment of a direct data forwarding channel provided by the embodiment of the present application may be as shown in FIG. 15.
  • S1501 UE1 (that is, the first terminal device) initiates a PDU session establishment request.
  • UE1 initiates a PDU session establishment request through a PDU session establishment request (PDU session establishment request) message, and the message carries the QoS index or UE group ID. In addition, it can also carry the first destination node (ie UE2). One logo.
  • PDU session establishment request PDU session establishment request
  • the radio access network device ie, the gNB in the figure
  • sends an indication message to the core network device such as AMF, SMF, UPF, etc. network elements
  • the indication message is used to indicate that the radio access network device supports direct data forwarding.
  • the indication message includes a local switch supported cell or a local switch cell.
  • S1502 may also occur before S1501, that is, the indication information is carried in the message sent when the interface is established or updated.
  • step 1402 in FIG. 14 For specific steps, refer to step 1402 in FIG. 14.
  • S1503 The AMF queries the corresponding QoS parameters according to the QoS index or the UE group ID in the PDU session establishment request.
  • core network equipment such as AMF, SMF, UPF and other network elements
  • core network equipment can also carry the address or identifier of the destination node according to the PDU session establishment request to determine which gNB coverage area the destination node is in. If the current destination node is not online , Then AMF needs to initiate a paging process.
  • core network devices such as network elements such as AMF, SMF, UPF, etc.
  • determine that UE1 and UE2 that is, the second terminal device
  • gNB radio access network device
  • the AMF sends a PDU session request message to the gNB, which contains the PDU session ID, UE1 address, the first identifier of UE2, QoS requirement, and NAS messages.
  • S1505 The gNB forwards the NAS message to UE1.
  • the gNB will also send DRB configuration information to UE1.
  • the DRB configuration information and the NAS message may be included in the same RRC message.
  • the AMF sends a NAS message to UE2.
  • the NAS message includes the PDU session ID, the first identifier of UE1, and the parameters required to generate the session key, such as KAMF/KgNB of UE1, counter, etc.
  • the NAS message from AMF to UE2 may be placed in the same PDU session request message to gNB as the NAS message from AMF to UE1. That is, the PDU session request message contains the PDU session ID, the first identifier of UE1, the first identifier of UE2, QoS requirement, NAS for UE1, NAS for UE2, and so on.
  • the gNB also sends DRB configuration information to UE2.
  • the DRB configuration information and the NAS message may be included in the same RRC message.
  • Scenario 2 The first terminal device and the second terminal device are in the coverage areas of different wireless access network devices.
  • the establishment of the direct data forwarding channel provided by the embodiment of the present application may be as shown in FIG. 16.
  • S1601 UE1 (that is, the first terminal device) initiates a PDU session establishment request.
  • the first radio access network device and the second radio access network device i.e. gNB1 and gNB2 in the figure
  • send instruction messages to core network devices such as network elements such as AMF, SMF, UPF, etc.
  • core network devices such as network elements such as AMF, SMF, UPF, etc.
  • S1603 The AMF queries the corresponding QoS parameters according to the QoS index or the UE group ID in the PDU session establishment request.
  • the AMF sends a PDU session request message to the gNB, which contains the PDU session ID, the first identifier of UE1, the first identifier of UE2, the QoS requirement, and the NAS message.
  • the AMF also needs to send the identity or cell identity of the gNB2 corresponding to UE2 to gNB1. So that when gNB1 receives a data packet from UE1, it determines which gNB to forward to.
  • the AMF may also send the identity of gNB1 to gNB2.
  • S1605 The gNB forwards the NAS message to UE1.
  • the gNB will also send DRB configuration information to UE1.
  • the DRB configuration information and the NAS message may be included in the same RRC message.
  • the AMF sends a PDU session setup to gNB2, which includes the PDU session ID, the first identifier of UE1, the first identifier of UE2, the QoS requirement, and the NAS message to UE2.
  • Step 1607 gNB2 forwards the NAS message to UE2, which contains the PDU session ID, the first identifier of UE1, and the parameters necessary for generating the session key as shown in the first embodiment.
  • Step 1608, gNB2 sends DRB configuration information to UE2.
  • UE2 in the foregoing embodiment may be replaced with a UE2 group.
  • UE1 initiates the PDU session establishment process, which contains the UE2 group identifier, and the gNB receives the PDU session establishment instruction containing the UE2 group identifier sent by the AMF.
  • the gNB broadcasts the multicast channel configuration parameters corresponding to the UE group, and the gNB gives The DRB configuration corresponding to UE1 (including the corresponding LCID).
  • the gNB When the gNB establishes the multicast channel corresponding to the slice ID (or UE Group) for the UE1, when the gNB receives the data sent by the UE1 in the LCID, it directly groups through the multicast channel corresponding to the slice (or UE group) broadcast.
  • the gNB establishes the DRB corresponding to the slice ID for the UE1, only when the gNB receives the UE1 group ID or multicast indication in the data sent by the LCID, the gNB passes the slice (or UE group) corresponding group Broadcast channel for multicast.
  • an embodiment of the present application provides a communication device.
  • the communication device may be specifically used to implement the method executed by the radio access network device in the embodiment shown in FIG. It can be the radio access network device itself, or it can be a chip or a chip set or a part of the chip used to perform related method functions in the radio access network device.
  • the structure of the communication device may be as shown in FIG. 17.
  • the device includes: a transceiver unit 1701 and a processing unit 1702.
  • the transceiving unit 1701 is configured to receive an establishment request message from a terminal device, the establishment request message is used to request the establishment of a DRB, and the establishment request message includes parameters for establishing the DRB.
  • the processing unit 1702 is configured to determine the QoS parameter of the DRB according to the parameter. Then the radio access network device sends an establishment response message to the terminal device, where the establishment response message is used to indicate that the DRB is successfully established.
  • the transceiver unit 1701 is further configured to send an establishment response message to the terminal device, where the establishment response message is used to indicate that the DRB is successfully established.
  • the transceiver unit 1701 is further configured to send a message to the terminal device, and the message is used to indicate that the wireless access network device supports direct data forwarding.
  • the terminal device sends the establishment request message requesting the establishment of the DRB to the radio access network device. In order to realize that the user plane data can be directly forwarded at the device supporting the wireless access network.
  • the processing unit 1702 is configured to obtain QoS parameters corresponding to the parameters used to determine the DRB from the core network device.
  • the parameter used to determine the DRB may include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, QFI, QoS index information, or QoS parameters.
  • the base station obtains the QoS parameters corresponding to the network slice identifier or the UE group identifier from the core network device in advance, so that the base station can guarantee the QoS requirements of the data during the user plane data transmission process.
  • the communication device in FIG. 17 can be used to implement the method executed by the terminal device in the embodiment described in FIG. 10.
  • the device may be the terminal device itself or the terminal device.
  • the device includes: a transceiver unit 1703 and a processing unit 1704.
  • the processing unit 1704 is configured to obtain QoS parameters and establish DRBs corresponding to the QoS parameters.
  • the transceiver unit 1703 is configured to send an establishment request message to the radio access network device, where the establishment request message is used to request the establishment of a DRB, and the establishment request message includes parameters for establishing the DRB.
  • the transceiver unit 1703 is further configured to receive an establishment response message sent by the wireless access network device, where the establishment response message is used to indicate that the DRB is successfully established.
  • the transceiving unit 1703 is also used to receive a message from the radio access network device.
  • the message is used to indicate that the radio access network device supports direct data forwarding.
  • the message may be an RRC message or a broadcast message.
  • the processing unit 1704 is configured to obtain the correspondence between the QoS parameter and the parameter used to determine the DRB from the core network device in advance.
  • the parameter used to determine the DRB may include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, QFI, QoS index information, or QoS parameters.
  • the communication device in FIG. 18 can be used to implement the method performed by the radio access network device in the embodiment shown in FIG. 10, and the device may be the radio access network device itself. It can also be a chip or a chip set or a part of a chip used to perform related method functions in a wireless access network device.
  • the transceiver unit 1801 is configured to receive user plane data sent by the first terminal device through the first DRB.
  • the user plane data is sent by the first terminal device to the second terminal device, and the user plane data includes the identifier of the second terminal device.
  • the processing unit 1802 is configured to determine the second DRB according to the identifier of the second terminal device.
  • the transceiver unit 1801 is further configured to directly forward the user plane data to the second terminal device through the second DRB.
  • the transceiver unit 1801 may send a third message to the first terminal device, the second terminal device, and the core network device.
  • the third message may be an RRC message or a broadcast message, and the third message is used to indicate that the user plane data can be directly forwarded on the data at the radio access network device.
  • the radio access network device can establish a direct data forwarding channel, that is, a DRB, so that the accuracy of establishing a direct data forwarding channel can be improved, and the accuracy of direct data forwarding at the access network can be improved.
  • the user plane data further includes parameters for determining the second DRB; the processing unit 1802 is configured to determine the second DRB according to the identifier and parameters of the terminal.
  • the parameters used to determine the second DRB include at least one of the following information: a network slice identifier, a group identifier where the first terminal device is located, a flow identifier QFI of a quality of service data stream, QoS index information, or QoS parameters.
  • the processing unit 1802 deletes the identifier of the second terminal device in the user plane data, or deletes the identifier and parameters of the second terminal device, The processed user plane data is then sent to the second terminal device, which can save air interface overhead.
  • the transceiver unit 1801 before the transceiver unit 1801 receives the user plane data sent by the first terminal device through the first DRB, the transceiver unit 1801 sends an establishment request message for requesting the establishment of the first DRB to the wireless access device, and the transceiver unit 1801 determines After the first DRB and the first QoS parameter, a first establishment response message is also sent to the first terminal device, where the first establishment response message is used to indicate that the first DRB is successfully established.
  • the embodiment of the present application provides a first communication device and a second communication device.
  • the first communication device may be specifically used to implement the first communication device in the embodiment shown in FIG.
  • the method for wireless execution by a wireless access network device the second communication device may be specifically used to implement the method for wireless execution by the second wireless access network device in the embodiment shown in FIG. 12, and the first communication device may be a first wireless device.
  • the access network device itself may also be a chip or a chip set or a part of the chip used to perform related method functions in the first wireless access network device.
  • the second communication device may be the second wireless access network device itself, It may also be a chip or a chip set or a part of the chip used to perform related method functions in the second radio access network device.
  • the structure of the communication device may be as shown in FIG. 19.
  • the first device includes: a transceiver unit 1901 and a processing unit 1902.
  • the second communication device includes: a transceiver unit 1903 and a processing unit 1904.
  • the transceiving unit 1901 is configured to receive user plane data sent by the first terminal device through the first wireless data bearer DRB, where the user plane data includes the identifier of the second terminal device.
  • the processing unit 1902 is configured to determine, according to the identifier of the second terminal device, that the second terminal device accesses the second wireless access network device.
  • the transceiver unit 1901 is further configured to send user plane data to the second wireless access network device, and the user plane data is used to send to the second terminal device.
  • the transceiver unit 1903 is configured to receive the user plane data from the first wireless access network device.
  • the processing unit 1904 is configured to determine the second DRB according to the identifier of the second terminal device; then the transceiver unit 1903 sends the user plane data to the second terminal device through the second DRB.
  • the transceiver unit 1901 is further configured to receive a request message sent by the first terminal device, and the request message is used to request the establishment of the first DRB; and then send a request response message to the first terminal device, the request response The message is used to indicate that the first DRB is successfully established, where the first DRB corresponds to the first QoS parameter.
  • the request message sent by the first terminal device may be an RRC message
  • the RRC message is a message generated by the RRC layer triggered by the NAS layer of the first terminal device.
  • the user plane data further includes parameters for determining the second DRB
  • the processing unit 1904 is configured to determine the second DRB according to the identifier of the second terminal device and the parameters.
  • the transceiver unit 1901 and the transceiver unit 1903 will also send a first message to the first terminal device, the second terminal device, and the core network device.
  • the first message indicates that the second radio access network device supports data forwarding. .
  • FIG. 20 is a schematic block diagram of a communication device 2000 according to an embodiment of the present application.
  • the communication device 2000 can execute each step executed by the terminal device in the foregoing method embodiment, and may also be used to execute each step executed by the network device in the foregoing method embodiment. In order to avoid repetition, it will not be described in detail here.
  • the communication device 2000 may be a terminal device or a chip used in a terminal device.
  • the communication device 2000 may also be a network device or a chip used in a network device.
  • the communication device 2000 includes:
  • the memory 2010 is used for storing programs
  • the communication interface 2020 is used to communicate with other devices
  • the processor 2030 is configured to execute programs in the memory 2010. When the communication device 2000 can execute the steps executed by the terminal device in the method embodiment corresponding to FIG. 9, the processor 2030 may execute the functions corresponding to the processing unit 1702 in FIG. 17. When the communication device 2000 can execute the steps executed by the access network device in the method embodiment corresponding to FIG. 9, the processor 2030 may execute the function corresponding to the processing unit 1702 in FIG. 17.
  • the processor 2030 may execute the function corresponding to the processing unit 1802 in FIG. 18 above.
  • the processor 2030 may execute the function corresponding to the processing unit 1902 in FIG. 19 described above.
  • the processor 2030 may execute the function corresponding to the processing unit 1904 in FIG. 19 described above.
  • the communication device 2000 shown in FIG. 20 may be a chip or a circuit.
  • a chip or circuit may be installed in a terminal device or a chip or circuit may be installed in a network device.
  • the aforementioned communication interface 2020 may also be a transceiver.
  • the transceiver includes a receiver and a transmitter.
  • the communication device 2000 may also include a bus system.
  • the processor 2030, the memory 2010, the receiver and the transmitter are connected by a bus system, and the processor 2030 is used to execute the instructions stored in the memory 2010 to control the receiver to receive signals and to control the transmitter to send signals to complete the communication of this application.
  • the receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as transceivers.
  • the memory 2010 may be integrated in the processor 2030, or may be provided separately from the processor 2030.
  • the functions of the receiver and transmitter may be implemented by a transceiver circuit or a dedicated transceiver chip.
  • the processor 2030 may be implemented by a dedicated processing chip, a processing circuit, a processor or a general-purpose chip.
  • the embodiment of the present application does not limit the specific connection medium between the aforementioned communication interface 2020, the processor 2030, and the memory 2010.
  • the memory 2010, the processor 2030, and the communication interface 2020 are connected by a bus.
  • the bus is represented by a thick line in FIG. 20.
  • the connection mode between other components is only for schematic illustration. It is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and so on. For ease of presentation, only one thick line is used to represent in FIG. 20, but it does not mean that there is only one bus or one type of bus.
  • the processor 2030 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which can implement Or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the memory 2010 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory).
  • a non-volatile memory such as a hard disk drive (HDD) or a solid-state drive (SSD), etc.
  • a volatile memory volatile memory
  • RAM random-access memory
  • the memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this.
  • the memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function for storing program instructions and/or data.
  • the communication device in the foregoing embodiment may be a terminal device or a circuit, and may also be a chip applied to a terminal device or other combination devices or components having the functions of the foregoing terminal device.
  • the transceiver unit may be a transceiver, which may include an antenna and a radio frequency circuit, etc.
  • the processing module may be a processor, such as a central processing unit (CPU).
  • the transceiver unit may be a radio frequency unit
  • the processing module may be a processor.
  • the transceiver unit may be an input/output interface of the chip system
  • the processing module may be a processor of the chip system.
  • FIG. 21 shows a simplified schematic diagram of a possible design structure of the terminal device involved in the foregoing embodiment.
  • the terminal device includes a transmitter 2101, a receiver 2102, a controller/processor 2103, a memory 2104, and a modem processor 2105.
  • the transmitter 2101 is used to transmit an uplink signal, and the uplink signal is transmitted to the access network device described in the foregoing embodiment via an antenna.
  • the antenna receives the downlink signal (DCI) transmitted by the network device in the above embodiment.
  • the receiver 2102 is used to receive a downlink signal (DCI) received from an antenna.
  • the encoder 2106 receives service data and signaling messages to be sent on the uplink, and processes the service data and signaling messages.
  • the modulator 2107 further processes (for example, symbol mapping and modulation) the encoded service data and signaling messages and provides output samples.
  • the demodulator 2109 processes (e.g., demodulates) the input samples and provides symbol estimates.
  • the decoder 2108 processes (e.g., decodes) the symbol estimation and provides decoded data and signaling messages sent to the terminal device.
  • the encoder 2106, the modulator 2107, the demodulator 2109, and the decoder 2108 can be implemented by a synthesized modem processor 2105. These units are processed according to the wireless access technology adopted by the wireless access network.
  • the controller/processor 2103 controls and manages the actions of the terminal device, and is used to execute the processing performed by the terminal device in the embodiment corresponding to FIG. 9 above. For example, determine the QoS parameters of DRB and establish DRB.
  • Fig. 22 shows a schematic structural diagram of a simplified communication device. It is easy to understand and easy to illustrate.
  • the communication device uses a network device as an example.
  • the network device 2200 may include one or more radio frequency units, such as a remote radio unit (RRU) 2210 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU). ) 2220.
  • RRU 2210 may be called a communication module, which corresponds to the foregoing transceiver unit.
  • the communication module may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 2211 and a radio frequency unit 2212. .
  • the RRU 2210 part is mainly used for sending and receiving of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending instruction information to terminal equipment.
  • the 2120 part of the BBU is mainly used to perform baseband processing, control the base station, and so on.
  • the RRU 2210 and the BBU 2220 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 2220 is the control center of the base station, and may also be called a processing module, which may correspond to the foregoing processing unit, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU processing module
  • the BBU may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.
  • the BBU 2220 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) of a single access standard, or can support different access standards. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 2220 also includes a memory 2221 and a processor 2222.
  • the memory 2221 is used to store necessary instructions and data.
  • the processor 2222 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the memory 2221 and the processor 2222 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • the embodiments of the present application also provide a communication system.
  • the communication system includes a terminal device and a network device, or may also include more terminal devices and network devices.
  • the terminal device and the network device are respectively used to implement the method implementation steps of the above-mentioned related devices in FIG. 9, FIG. 10, and FIG. 12. For details, please refer to the relevant descriptions in the above method embodiments, which will not be repeated here.
  • An embodiment of the present application also provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the methods executed by the devices in FIG. 9, FIG. 10, and FIG. 12.
  • the embodiments of the present application also provide a computer program product, including instructions, which when run on a computer, cause the computer to execute the method executed by the devices in FIG. 9, FIG. 10, and FIG. 12.
  • the embodiment of the present application provides a chip system, which includes a processor and may also include a memory, which is used to implement the functions of the terminal device and the network device in the foregoing method.
  • the chip system can be composed of chips, or it can include chips and other discrete devices.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be Other division methods, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual communication connections may be indirect couplings or communication connections through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.
  • the units in the device embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the processor in the embodiment of the present application may be a central processing unit (central processing unit, CPU), or other general-purpose processors, digital signal processors (digital signal processors, DSP), and application-specific integrated circuits. (application specific integrated circuit, ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof.
  • the general-purpose processor may be a microprocessor or any conventional processor.
  • the methods in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented by software, it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer programs or instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer program or instruction may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instruction may be transmitted from a website, computer, server, or The data center transmits data to another website, computer, server, or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media.
  • the available medium may be a magnetic medium (for example, a floppy disk, Hard disk, magnetic tape), optical medium (for example, digital video disc (digital video disc, DVD for short)), or semiconductor medium (for example, SSD), etc.
  • An exemplary storage medium is coupled to the processor, so that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium may also be an integral part of the processor.
  • the processor and the storage medium may be located in the ASIC.
  • the ASIC can be located in a network device or a terminal device.
  • the processor and the storage medium may also exist as discrete components in the sending device or the receiving device.

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

Abstract

L'invention concerne un procédé et un appareil de communication. Le procédé comprend les étapes suivantes : un dispositif de réseau d'accès sans fil reçoit un message de demande d'établissement provenant d'un dispositif terminal, le message de demande d'établissement étant utilisé pour demander l'établissement d'une DRB, et le message de demande d'établissement comprenant un paramètre pour établir une DRB ; le dispositif de réseau d'accès sans fil détermine un paramètre de QoS de la DRB selon le paramètre ; puis, le dispositif de réseau d'accès sans fil envoie un message de réponse d'établissement au dispositif terminal, le message de réponse d'établissement étant utilisé pour indiquer la réussite de l'établissement de la DRB. Le procédé et l'appareil de la présente invention permettent de résoudre le problème de redondance d'un processus de transmission lorsque des données de plan d'utilisateur sont transmises entre des terminaux.
PCT/CN2019/120440 2019-11-22 2019-11-22 Procédé et appareil de communication WO2021097858A1 (fr)

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