WO2024017143A1 - Procédé et appareil de délestage dans un scénario d'itinérance, et support de stockage - Google Patents

Procédé et appareil de délestage dans un scénario d'itinérance, et support de stockage Download PDF

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Publication number
WO2024017143A1
WO2024017143A1 PCT/CN2023/107328 CN2023107328W WO2024017143A1 WO 2024017143 A1 WO2024017143 A1 WO 2024017143A1 CN 2023107328 W CN2023107328 W CN 2023107328W WO 2024017143 A1 WO2024017143 A1 WO 2024017143A1
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WIPO (PCT)
Prior art keywords
roaming
smf
upf
user terminal
information
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PCT/CN2023/107328
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English (en)
Chinese (zh)
Inventor
陈婉珺
王光全
马泽芳
任驰
马瑞涛
Original Assignee
中国联合网络通信集团有限公司
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Publication of WO2024017143A1 publication Critical patent/WO2024017143A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server
    • H04W8/065—Registration at serving network Location Register, VLR or user mobility server involving selection of the user mobility server
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0893—Assignment of logical groups to network elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06—Registration at serving network Location Register, VLR or user mobility server

Definitions

  • the present application relates to the field of communication technology, and in particular, to a offloading method, device and storage medium in a roaming scenario.
  • the service flow of the user terminal needs to be diverted back to the home location, or the user session needs to remain uninterrupted.
  • This application provides a traffic offloading method, device and storage medium in a roaming scenario, for offloading the network in the roaming location.
  • this application provides a offloading method in a roaming scenario, which includes: applying to the roaming SMF, and the roaming SMF receives the first information sent by the roaming AMF.
  • the first information includes the DNN information of the user terminal and network slicing. Identification; the roaming location SMF selects the first UPF as the main anchor point from at least one UPF controlled by the roaming location SMF according to the DNN information of the user terminal and the network slice identifier.
  • the first UPF is used to offload the public network service of the user terminal; the roaming location
  • the SMF receives the second information sent by the home policy control function PCF.
  • the second information includes the DNAI list signed by the user terminal.
  • the roaming SMF determines the target UPF as the secondary anchor point based on the DNAI list signed by the user terminal.
  • the target UPF is used to divert users. Terminal private network services.
  • the method further includes: if there is a UPF in the roaming UPF controlled by the roaming SMF that supports the DNAI list subscribed by the user terminal, then the roaming SMF, based on the DNAI list, The second UPF is selected as the first auxiliary anchor point from at least one UPF controlled by the roaming SMF, and the second UPF is used to offload the private network service of the user terminal.
  • the method further includes: if there is no UPF in the roaming UPF controlled by the roaming SMF that supports the DNAI list subscribed by the user terminal, then the roaming SMF reports to the home SMF. Send the second information and the first instruction.
  • the first instruction is used to instruct the home SMF to determine the third UPF as the second auxiliary anchor point according to the DNAI list signed by the user terminal.
  • the third UPF is the home UPF controlled by the home SMF.
  • the third UPF is used to distribute the private network service of the terminal, and the third UPF is connected to the ULCL branch point through the first interface; among them, the home SMF is the roaming AMF based on the DNN information of the user terminal, S-NSSAI information and the home province of the user terminal. information; or, the home SMF is determined by the roaming AMF based on the user terminal's DNN information, S-NSSAI information and the user terminal's home PLMN information.
  • the method further includes: the roaming SMF establishes a session with the home SMF through a second interface according to the ID of the home SMF, where the second interface is used to connect to the home SMF.
  • the method further includes: the roaming SMF determines the home PCF according to the current operator's local offload LBO configuration; the roaming SMF sends the first request information to the home PCF , the first request information is used to obtain the SM policy of the user terminal.
  • this application provides a traffic offload device in a roaming scenario, including: a receiving unit, configured to receive the first information sent by the roaming AMF, where the first information includes the DNN information of the user terminal and the network slice identifier; a processing unit , used to select the first UPF as the main anchor point from at least one UPF controlled by the roaming SMF according to the DNN information and network slice identification of the user terminal, and the first UPF is used to offload the public network service of the user terminal; the receiving unit also It is used to receive the second information sent by the home policy control function PCF.
  • the second information includes the DNAI list signed by the user terminal; the processing unit is also used to determine the target UPF as the auxiliary anchor point according to the DNAI list signed by the user terminal.
  • the target UPF Used to offload private network services from user terminals.
  • the processing unit is also configured to: if there is a UPF in the roaming UPF controlled by the roaming SMF that supports the DNAI list contracted by the user terminal, based on the DNAI list, from the roaming
  • the second UPF is selected as the first auxiliary anchor point from at least one UPF controlled by the local SMF, and the second UPF is used to offload the private network service of the user terminal.
  • the processing unit is also configured to: if there is no UPF supporting the DNAI list subscribed by the user terminal in the roaming UPF controlled by the roaming SMF, send the UPF to the home SMF.
  • the first instruction is used to instruct the home SMF to determine the third UPF as the second secondary anchor point according to the DNAI list subscribed by the user terminal.
  • the third UPF is the home UPF controlled by the home SMF.
  • the third The UPF is used to offload the private network services of the terminal.
  • the third UPF is connected to the ULCL branch point through the first interface; where the home SMF is the roaming AMF according to the DNN information and S-NSSAI of the user terminal. information and the home province information of the user terminal; or, the home SMF is determined by the roaming AMF based on the user terminal's DNN information, S-NSSAI information and the user terminal's home PLMN information.
  • the processing unit is also configured to establish a session with the home SMF through a second interface according to the ID of the home SMF, wherein the second interface is used to connect the home SMF and the home SMF; the first information also includes the ID of the home SMF; and a sending unit configured to send the second information and the first instruction to the home SMF through the second interface.
  • the processing unit is also used to determine the home PCF according to the current operator's LBO configuration; the sending unit is also used to send the first request information to the home PCF, The first request information is used to obtain the SM policy of the user terminal.
  • a offloading device in a roaming scenario including: a processor and a memory; wherein, the memory is used to store computer execution instructions.
  • the processor executes the computer execution instructions stored in the memory. , so that the offloading device in the roaming scenario implements the offloading method in the roaming scenario as described in any possible implementation manner of the first aspect.
  • a computer-readable storage medium includes instructions that cause the computer to execute as described in any possible implementation manner of the first aspect when the offloading device in the roaming scenario is executed. Diversion method in roaming scenario.
  • the embodiment of the present application provides a method of offloading in a roaming scenario.
  • the roaming SMF selects the first UPF from at least one UPF controlled by the roaming SMF according to the DNN information of the user terminal and the network slice identifier.
  • UPF serves as the main anchor point, and the first UPF is used to offload the public network services of user terminals.
  • the roaming SMF can allocate the public network services of the user terminal to the first UPF for processing.
  • the roaming SMF determines the target UPF as the auxiliary anchor point based on the DNAI list signed by the user terminal.
  • the target UPF is used to offload the private network service of the user terminal.
  • the roaming SMF can allocate the private network services of the user terminal to the target UPF for processing.
  • both the public network services and the private network services in the user terminal are processed in the roaming area, thus realizing the network offloading of the user terminal in the roaming area.
  • the service flow of the user terminal can be directly diverted in the roaming place, and there is no need to return the service flow to the home place for processing, which shortens the routing of the service flow; in addition, the user terminal moves from the home place to the roaming place. During the process, the session of its terminal does not need to remain uninterrupted, which improves the service analysis of the user terminal. Flow practicality.
  • Figure 1 is a schematic structural diagram of a traffic distribution device in a roaming scenario provided by an embodiment of the present application
  • Figure 2 is a schematic diagram of a 5G service-oriented interface system architecture provided by an embodiment of this application.
  • Figure 3 is a schematic diagram of a 5G point-to-point interface system architecture provided by an embodiment of the present application.
  • Figure 4 is a schematic diagram of user plane and signaling plane routing during roaming access provided by an embodiment of the present application
  • FIG. 5 is a schematic diagram of an I-SMF insertion architecture provided by an embodiment of the present application.
  • Figure 6 is a schematic diagram of a ULCL offloading architecture provided by an embodiment of the present application.
  • Figure 7 is a schematic diagram of a ULCL offload architecture with I-SMF insertion provided by an embodiment of the present application.
  • Figure 8 is an I-SMF controlled ULCL shunt flow chart provided by an embodiment of the present application.
  • Figure 9 is a schematic flow chart of offloading in a roaming scenario provided by an embodiment of the present application.
  • Figure 10 is a schematic flow chart of offloading in a roaming scenario provided by an embodiment of the present application.
  • Figure 11 is a schematic flow chart of offloading in a roaming scenario provided by an embodiment of the present application.
  • Figure 12a is a schematic flow chart of offloading in a roaming scenario provided by an embodiment of the present application.
  • Figure 12b is a schematic diagram of the offload network architecture and service routing in a roaming scenario provided by the embodiment of the present application;
  • Figure 12c is a schematic diagram of the offload network architecture and service routing in another roaming scenario provided by the embodiment of the present application.
  • Figure 13 is a schematic flow chart of offloading in a roaming scenario provided by an embodiment of the present application.
  • Figure 14 is a schematic flow chart of offloading in a roaming scenario provided by an embodiment of the present application.
  • Figure 15 is a schematic flow chart of offloading in a roaming scenario provided by an embodiment of the present application.
  • Figure 16 is a schematic structural diagram of a traffic distribution device in a roaming scenario provided by an embodiment of the present application.
  • a and/or B can mean: A exists alone, A and B exist simultaneously, and they exist alone. B these three situations.
  • first and second in the description of this application and the drawings are used to distinguish different objects, or to distinguish different processes on the same object, rather than to describe a specific order of objects.
  • references to the terms “including” and “having” and any variations thereof in the description of this application are intended to cover non-exclusive inclusion.
  • a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes other unlisted steps or units, or optionally also Includes other steps or units that are inherent to such processes, methods, products, or devices.
  • the process of offloading services to user terminals in roaming locations is generally implemented through ULCL controlled by I-SMF.
  • This process includes the following two situations: Situation 1. When the user terminal initiates a new session in roaming locations , the user terminal needs to return to access.
  • Scenario 2 The user terminal establishes a PDU session at the home location in advance and selects the anchor point of the PDU session. When the user terminal moves from its home location to its roaming location without interrupting the session, the network equipment in the roaming location will not have the opportunity to establish a new session with the user terminal, and will not be able to allocate a new PDU session anchor to the user terminal. point, it is never guaranteed that the PDU session anchor remains unchanged. After the user terminal enters the roaming area, the original PDU session anchor can continue to offload the user terminal's network. However, this process requires the user terminal to keep the session uninterrupted for a long time during movement, which increases power consumption and also brings inconvenience to the user.
  • the technical solutions of the embodiments of the present application can be used in various communication systems.
  • the communication system can be a third generation partnership project (3GPP) communication system, for example, a long term evolution (LTE) system, and It can be used for fifth-generation mobile communication technology (5th-Generation Mobile Communication Technology, 5G) mobile communication system, NR system, new air interface vehicle networking (vehicle to everything, NR V2X) system, and can also be applied to LTE and 5G hybrid networking.
  • 3GPP third generation partnership project
  • LTE long term evolution
  • 5G fifth-generation mobile communication technology
  • 5G fifth-generation mobile communication technology
  • NR system new air interface vehicle networking (vehicle to everything, NR V2X) system
  • LTE and 5G hybrid networking LTE and 5G hybrid networking.
  • systems or device-to-device (D2D) communication systems, machine-to-machine (M2M) communication systems, Internet of Things (IoT), and other next-generation communication systems, also It can be a non
  • eMBB enhanced mobile broadband
  • ultra-reliable low-latency communication ultra reliable Communication scenarios such as low latency communication (URLLC)
  • MTC machine type communication
  • mMTC massive machine type communications
  • SA D2D, V2X, and IoT.
  • the terminal device involved in this application may be a device used to implement communication functions.
  • Terminal equipment can also be called user equipment (UE), terminal, access terminal, user unit, user station, mobile station (MS), remote station, remote terminal, mobile terminal (MT) , user terminal, wireless communication equipment, user agent or user device, etc.
  • the terminal device may be, for example, a wireless terminal or a wired terminal in an IoT, V2X, D2D, M2M, 5G network, or a future evolved PLMN.
  • a wireless terminal can refer to a device with wireless transceiver functions, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites, etc.).
  • the terminal device may be a drone, an IoT device (for example, a sensor, an electricity meter, a water meter, etc.), a V2X device, a station (ST) in a wireless local area network (WLAN), a cellular phone, Cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistant (PDA) devices, handheld devices with wireless communication capabilities, computing devices Or other processing devices connected to wireless modems, vehicle-mounted devices, wearable devices (also known as wearable smart devices), tablets or computers with wireless transceiver functions, virtual reality (VR) terminals, industrial control ( Wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, wireless terminals in smart grid, and transportation safety Wireless terminals, wireless terminals in smart cities, wireless terminals in smart homes, vehicle-mounted terminals, vehicles with vehicle-to-vehicle (V2V) communication capabilities, intelligent connected vehicles , UAVs with UAV to UAV (U2U)
  • the embodiment of the present application provides a offloading device in the roaming scenario, which is used to perform the offloading method in the roaming scenario provided by the embodiment of the present application.
  • Figure 1 is a diagram of this application.
  • the application embodiment provides a schematic structural diagram of a traffic distribution device in a roaming scenario.
  • the offload device 100 in the roaming scenario includes at least one processor 101 , a communication line 102 , and at least one communication interface 104 , and may also include a memory 103 .
  • the processor 101, the memory 103 and the communication interface 104 can be connected through a communication line 102.
  • the processor 101 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present application.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • DSP digital signal processors
  • FPGA field programmable gate array
  • Communication line 102 may include a path for communicating information between the components described above.
  • the communication interface 104 is used to communicate with other devices or communication networks, and can use any device such as a transceiver, such as Ethernet, wireless access network (radio access network, RAN), WLAN, etc.
  • a transceiver such as Ethernet, wireless access network (radio access network, RAN), WLAN, etc.
  • the memory 103 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory (RAM)) or other type that can store information and instructions.
  • a dynamic storage device can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to include or store desired program code in the form of instructions or data structures and can be used by a computer Any other medium for access, but not limited to this.
  • EEPROM electrically erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • CD-ROM compact disc read-only memory
  • optical disc storage including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.
  • the memory 103 can exist independently of the processor 101, that is, the memory 103 can be a memory external to the processor 101. In this case, the memory 103 can be connected to the processor 101 through the communication line 102 for storing execution data. Instructions or application codes are executed under the control of the processor 101 to implement the offloading method in the roaming scenario provided by the following embodiments of the present application.
  • the memory 103 can also be integrated with the processor 101, that is, the memory 103 can be an internal memory of the processor 101.
  • the memory 103 can be a cache, which can be used to temporarily store some data and instructions. Information etc.
  • the processor 101 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 1 .
  • the offloading device 100 in a roaming scenario may include multiple processors, such as the processor 101 and the processor 107 in Figure 1 .
  • the offloading device 100 in the roaming scenario may also include an output device 105 and an input device 106.
  • FIG. 2 provides a schematic diagram of the 5G service-based interface system architecture.
  • the 5G service-based interface system architecture can deploy and use technologies such as Network Function Virtualization (NFV) and Software Defined Network (SOFTWARE Defined Network, SDN).
  • NFV Network Function Virtualization
  • SOFTWARE Defined Network SDN
  • the 5G service-oriented interface system architecture can also send service-based interactive instructions between control plane functions according to service requirements.
  • the service interfaces of the 5G service-oriented interface system architecture include: network slice selection function (NSSF), network exposure function (NEF), network repository function (NRF), and policy control function (policy control function, PCF), unified data management (unified data management, UDM), application function (application function, AF), authentication Server function (authentication server function, AUSF) entity, core access and mobility management function (AMF), session management function (SMF), service communication proxy (Service Communication Proxy, SCP) , user terminal, (radio) access network ((radio) access network, (R)AN), user plane function (user plane function, UPF), data network (data network, DN).
  • NSSF network slice selection function
  • NEF network exposure function
  • NRF network repository function
  • policy control function policy control function
  • PCF policy control function
  • unified data management unified data management
  • UDM unified data management
  • application function application function, AF
  • authentication Server function authentication server function
  • AMF authentication Server function
  • SMF session management function
  • SCP Service Communication Proxy
  • FIG. 3 provides a schematic diagram of the 5G point-to-point interface system architecture.
  • the 5G point-to-point interface system architecture includes: AUSF entity, AMF entity, DN, UDM entity, PCF entity, RAN equipment, UPF entity, user terminal, AF entity, SMF entity, NSSF entity and air interfaces N1, N2 and N3.
  • the AUSF entity is used to authenticate users;
  • the UDM entity is used to store user subscription data;
  • DN includes operator services, Internet access or third-party services.
  • the intra-PLMN network roaming architecture process is shown in Figure 4.
  • the roaming location AMF and roaming location SMF send request messages to the home UDM to obtain the user terminal subscription information;
  • the roaming AMF and the roaming SMF send request messages to the home PCF to obtain the policy information of the user terminal.
  • the user terminal can access the roaming DN through the roaming UPF.
  • the intra-PLMN network roaming architecture process is shown in Figure 5.
  • the user terminal is roaming, because it is used to offload the network
  • the anchor point's home UPF and corresponding home SMF remain unchanged. Therefore, it is necessary to insert the I-SMF and the roaming UPF corresponding to the I-SMF in the roaming area, so as to divert user traffic.
  • 3GPP defines a distribution architecture. There are two main distribution methods in this sub-architecture, namely Uplink Classifier (UPF) distribution and BP distribution.
  • UPF Uplink Classifier
  • BP BP distribution
  • ULCL offloading determines the routing path of data packets based on flow filtering rules. For example, the flow filtering rules determine the routing path of data packets based on the destination IP address or prefix of the detected upstream IP data packet sent by the user terminal.
  • the user terminal does not perceive the offloading of ULCL and does not participate in the insertion and deletion of ULCL.
  • the user terminal associates a single IPv4 address or a single IP prefix or both assigned by the network to the packet data unit (packet data unit, PDU) session.
  • BP offloading allocates different service anchor points to different IPv6 address prefixes of user terminals, and branch points are offloaded through user terminal address prefixes.
  • the SMF receives request information from the user terminal, which includes: DNN information of the user terminal and location information covered by the UPF.
  • SMF selects UPF PSA1 as the main anchor point based on the request information. This main anchor point is used to allocate IP addresses to the user terminal.
  • the SMF triggers the ULCL process based on the user terminal's subscription information in the PCF; or, the SMF triggers the ULCL process based on the traffic offloading policy configured locally by the user terminal in the SMF.
  • SMF selects ULCL UPF based on the current location (TAI) of the user terminal.
  • TAI current location
  • SMF determines the destination anchor point PSA for ULCL shunting based on the DNAI issued by the configured DNAI; or, SMF determines the destination anchor point PSA for ULCL shunting based on the DNAI issued by PCF; PSA is the auxiliary anchor point.
  • the target PSA is PSA2 in Figure 3.
  • PSA1 PDU Session Anchor 1
  • PSA1 is used to connect to public network services.
  • the SMF will determine the UPF sinking in the private network campus as the secondary anchor point PSA2 based on the offloading strategy.
  • PSA2 is used to connect private network campus services.
  • select the diversion point based on the user's location. Generally, the diversion point selected at this time will coincide with PSA2.
  • FIG. 7 is a diagram of the ULCL offloading architecture for I-SMF insertion.
  • the I-SMF controlled ULCL offloading process shown in Figure 8 is as follows:
  • UE establishes a PDU session with PSA1 in which I-SMF participates; S802.
  • I-SMF discovers PSA2; S803.
  • I-SMF determines to use BP offloading or UL-CL offloading; S804.
  • SMF updates PSA1 downlink Traffic; S806.
  • I-SMF updates PSA2; S808.
  • I-SMF updates BP offloading or UL-CL offloading; S809. Receive a response to establish a PDU session; S810. Home SMF will offload the rules.
  • the corresponding N4 (forwarding action rule (FAR), packet detection rule (PDR) and other information) information is passed to I-SMF through the N16a interface, thereby realizing the offloading of roaming locations; S811, I- SMF releases I-UPF. That is to say, the roaming I-SMF sends the first DNAI list supported by the I-SMF to the home SMF; the home SMF selects the second DNAI list that the PDU session is interested in from the first DNAI list based on the offload service contracted by the user terminal. , where each DNAI corresponds to the UPF owned by a private network.
  • I-SMF selects PSA2 based on the second DNAI list; I-SMF selects a branch point to replace I-UPF based on the location TA of the user terminal; home SMF passes the N4 information corresponding to the offloading rule to I-SMF through the N16a interface, thus Realize the diversion of roaming areas.
  • the condition for I-SMF controlled ULCL offloading is: when the user terminal initiates a new session in the roaming area Use regression access method. Or, the user terminal has established a PDU session at the home site and selected the session anchor (PSA1); the user terminal switches from the home site to inserting I-SMF and the UPF corresponding to I-SMF while the session is not interrupted. In the roaming area, the main anchor point (PSA1) does not change.
  • the process of offloading services to user terminals in roaming locations is generally implemented through ULCL controlled by I-SMF.
  • This process includes the following two situations: Situation 1. When the user terminal initiates a new session in roaming locations , the user terminal needs to return to access.
  • Scenario 2 The user terminal establishes a PDU session at the home location in advance and selects the anchor point of the PDU session. When the user terminal moves from its home location to its roaming location without interrupting the session, the network equipment in the roaming location will not have the opportunity to establish a new session with the user terminal, and will not be able to allocate a new PDU session anchor to the user terminal. point, it is never guaranteed that the PDU session anchor remains unchanged. After the user terminal enters the roaming area, the original PDU session anchor can continue to offload the user terminal's network. However, this process requires the user terminal to keep the session uninterrupted for a long time during movement, which increases power consumption and also brings inconvenience to the user.
  • embodiments of the present application provide a method of offloading in a roaming scenario.
  • the roaming SMF selects the first UPF from at least one UPF controlled by the roaming SMF according to the DNN information of the user terminal and the network slice identifier.
  • One UPF serves as the main anchor point, and the first UPF is used to offload the public network services of user terminals.
  • the roaming SMF can allocate the public network services of the user terminal to the first UPF for processing.
  • the roaming SMF determines the target UPF as the auxiliary anchor point based on the DNAI list signed by the user terminal.
  • the target UPF is used to offload the private network service of the user terminal.
  • the roaming SMF can allocate the private network services of the user terminal to the target UPF for processing.
  • both the public network services and the private network services in the user terminal are processed in the roaming area, thus realizing the network offloading of the user terminal in the roaming area.
  • the service flow of the user terminal can be directly diverted in the roaming place, and there is no need to return the service flow to the home place for processing, which shortens the routing of the service flow; in addition, the user terminal moves from the home place to the roaming place.
  • the session of its terminal does not need to remain uninterrupted, which improves the practicality of business offloading of user terminals.
  • the offloading method in the roaming scenario includes:
  • the roaming SMF receives the first information sent by the roaming AMF.
  • the first information includes data network name (DNN) information and network slice identification of the user terminal.
  • DNN data network name
  • the roaming SMF receives the first information sent by the roaming AMF and creates a session management (Session Management, SM) context.
  • Session Management Session Management
  • the network slice identifier may be network slice selection assistance information (NSSAI).
  • NSSAI is a collection of S-NSSAI, each NSSAI contains multiple Network slice selection assistance information (single network slice selection assistance information, S-NSSAI).
  • the roaming SMF selects the first UPF as the main anchor point from at least one UPF controlled by the roaming SMF according to the DNN information of the user terminal and the network slice identifier.
  • the first UPF is used to divert public network services of user terminals, and public network services include Internet services.
  • the roaming SMF establishes an N4 session as the primary anchor point, and the primary anchor point is used to allocate IP addresses to user terminals.
  • the main anchor point allocates an IP address to a user terminal
  • the IP address of the user terminal matches the actual location (roaming location) of the user terminal, which can meet the actual needs of supervision and network management.
  • the roaming SMF receives the second information sent by the home PCF.
  • the second information includes a data network access identifier (DNAI) list of the user terminal.
  • the DNAI list includes at least one DNAI, and each DNAI in the at least one DNAI corresponds to a UPF index.
  • the roaming SMF sends request information carrying the user terminal user permanent identifier (SUPI) to the home PCF, and the request information is used for the SM policy of the user terminal; the home PCF responds according to the request information, determine the SM policy of the user terminal, and send the second information to the roaming SMF. Correspondingly, the roaming SMF receives the second information sent by the home PCF.
  • SUPI user permanent identifier
  • the roaming SMF determines the target UPF as the auxiliary anchor point based on the DNAI list contracted by the user terminal.
  • the target UPF is used to offload the terminal's private network services.
  • the roaming SMF determines at least one DNAI corresponding to the UPF index based on the number of DNAIs in the DNAI list and the preset corresponding relationship.
  • the roaming SMF determines the target UPF as a secondary anchor based on the DNAI corresponding UPF index.
  • the correspondence relationship is the correspondence relationship between the number of DNAIs and the index of each UPF.
  • the target UPF may be the roaming UPF, and the target UPF may be the home UPF.
  • the roaming SMF selects the first UPF as the main anchor point from at least one UPF controlled by the roaming SMF according to the DNN information and network slice identification of the user terminal.
  • a UPF is used to offload public network services from user terminals.
  • the roaming SMF can allocate the public network services of the user terminal to the first UPF for processing.
  • the roaming SMF determines the target UPF as the secondary anchor point based on the DNAI list signed by the user terminal.
  • the target UPF is used to offload the private network service of the user terminal.
  • the roaming SMF can allocate the private network services of the user terminal to the target UPF for processing.
  • both the public network services and the private network services in the user terminal are processed in the roaming area, thus realizing the network offloading of the user terminal in the roaming area.
  • the service flow of the user terminal can be directly diverted in the roaming place, and there is no need to return the service flow to the home place for processing, which shortens the routing of the service flow; in addition, the user terminal moves from the home place to the roaming place.
  • the session of its terminal does not need to remain uninterrupted, which improves the practicality of business offloading of user terminals.
  • the roaming SMF establishes an N4 session as the primary anchor point, and the primary anchor point is used to allocate IP addresses to user terminals.
  • the IP address assigned to the user terminal is the IP address of the roaming location where the main anchor point is located, thereby meeting the actual needs of supervision and network management.
  • the process of determining the target UPF as a secondary anchor point based on the DNAI list contracted by the user terminal is introduced by the roaming SMF.
  • the above S904 can also be implemented through the following S1001-S1002.
  • the roaming SMF selects the second UPF as the first auxiliary anchor from at least one UPF controlled by the roaming SMF according to the DNAI list. point.
  • the second UPF is used to distribute the private network services of the terminal.
  • the roaming SMF queries the roaming UPF controlled by it. If there is at least one DNAI corresponding to the UPF index in the roaming UPF controlled by the roaming SMF, the roaming SMF selects based on the DNAI corresponding UPF index.
  • the second UPF serves as the first auxiliary anchor point.
  • the roaming SMF sends the second information and the first instruction to the home SMF.
  • the first instruction is used to instruct the home SMF to determine the third UPF as the second secondary anchor point based on the DNAI list signed by the user terminal.
  • the third UPF is the home UPF controlled by the home SMF.
  • the third UPF is used to offload the terminal.
  • the third UPF is connected to the ULCL branch point through the first interface; where the home SMF is determined by the roaming AMF based on the user terminal's DNN information, S-NSSAI information and the user terminal's home province information; or, the home SMF
  • the local SMF is determined by the roaming AMF based on the user terminal's DNN information, S-NSSAI information, and the user terminal's home PLMN information.
  • the first interface includes a N y interface.
  • the roaming SMF obtains the second information from the home PCF. Then, the roaming SMF determines the target UPF as the secondary anchor point based on the DNAI list as follows: If there is a UPF in the roaming UPF controlled by the roaming SMF that supports the DNAI list subscribed by the user terminal, the roaming SMF determines from the DNAI list based on the DNAI list. Select the second UPF as the first auxiliary anchor point among at least one UPF controlled by the roaming SMF.
  • the roaming SMF sends the second information and the first instruction to the home SMF.
  • the home SMF can choose the home UPF to handle private network services and shorten service flow routing. Therefore, the roaming SMF can offload the private network services of user terminals.
  • the roaming SMF establishes a session with the home SMF through the second interface according to the ID of the home SMF.
  • the session includes a PDU session.
  • the roaming SMF receives the first information sent by the roaming AMF, and determines the ID of the home SMF based on the first information; the roaming SMF communicates with the home SMF through the second interface based on the ID of the home SMF.
  • a PDU session is established, in which the second interface is used to connect the home SMF and the home SMF.
  • the first information also includes the ID of the home SMF, and the second interface includes the N x interface.
  • the roaming SMF sends the second information and the first instruction to the home SMF through the second interface.
  • the home SMF receives the second information and the first instruction. Since the second information includes the DNAI list signed by the user terminal, in this way, the home SMF receives the second information and the preset command according to the number of DNAIs in the DNAI list. Correspondence relationship, determine that at least one DNAI corresponds to the UPF index. The home SMF selects the third UPF as the second auxiliary anchor point from at least one UPF controlled by the home SMF according to the DNAI corresponding UPF index. An N4 session is established between the home SMF and the second secondary anchor point.
  • the roaming SMF will handle the private network offloading through the first instruction.
  • the DNAI list subscribed by the user terminal is also sent to the home SMF.
  • the home SNF after receiving the second information can select the third UPF as the second secondary anchor point from at least one UPF controlled by the home SMF.
  • the second secondary anchor point is used for the private network of the user terminal.
  • the embodiment of the present application also provides a method for establishing a communication channel between the user terminal and the anchor point.
  • the following describes the process of establishing a communication channel between the user terminal and the anchor point.
  • the above process can be implemented specifically through the following S1201-S1209.
  • the roaming SMF receives the PDU session establishment response message sent by the home SMF.
  • the PDU session establishment response message includes DNAI list information supported by the second auxiliary anchor point.
  • the roaming SMF selects a ULCL branch point.
  • the roaming SMF selects the fourth UPF as the ULCL branch point from at least one UPF controlled by the roaming SMF.
  • the roaming SMF selects S-UPF as the ULCL branch point.
  • the S-UPF is connected to the main anchor point, the first auxiliary anchor point and the second auxiliary anchor point respectively, where the S-UPF passes through the third auxiliary anchor point.
  • the second interface is connected to the second auxiliary anchor point.
  • the roaming SMF selects the first UPF as the ULCL branch point.
  • the roaming SMF establishes an N4 session for the ULCL branch point.
  • the roaming SMF establishes an AN-side session process with the user terminal.
  • the roaming SMF sends a third indication message to the main anchor point.
  • the third instruction message is used to instruct the establishment of a data transmission channel.
  • the roaming SMF updates the branch point CN tunnel information and the third indication message to the main anchor point, and the main anchor point updates the branch point CN tunnel information and the third indication message according to the updated branch point CN tunnel information and
  • the third instruction message is to establish a downlink data transmission channel.
  • the roaming SMF sends a third indication message to the main anchor point, and the main anchor point establishes a downlink data transmission channel according to the third indication message.
  • the roaming SMF sends the fifth information to the home SMF.
  • the fifth information includes: branch point CN tunnel information and routing information corresponding to the DNAI list.
  • the routing information corresponding to the DNAI list includes the flow description and forwarding purpose information of the DNAI list.
  • the home SMF sends flow routing information and CN tunnel information to the second secondary anchor point.
  • the flow routing information includes FAR information of the user terminal and PDR information of the user terminal.
  • the home SMF receives the CN tunnel information of the second secondary anchor point sent by the second secondary anchor point.
  • the home SMF sends the CN tunnel information of the second secondary anchor point to the roaming SMF.
  • the home SMF sends the CN tunnel information of the second secondary anchor point to the roaming SMF through a PDU session update response message.
  • the home SMF sends the CN tunnel information of the second secondary anchor point to the roaming SMF, the downlink data transmission channel of the second secondary anchor point is established.
  • the roaming location SMF sends the anchor CN tunnel information update message to the branch point UPF.
  • the roaming SMF sends the CN tunnel information of the primary anchor point and the CN tunnel information of the second secondary anchor point to the fourth UPF, so that the uplink of the user terminal to the primary anchor point and the second secondary anchor point Pathways have also been established.
  • the roaming SMF sends the CN tunnel information of the second secondary anchor point to the first UPF, so that the uplink path from the user terminal to the primary anchor point and the second secondary anchor point has also been established.
  • the process of the communication channel between the user terminal and the anchor point is the same as that in the non-roaming scenario.
  • Figure 6 shows that the main anchor point, the first auxiliary anchor point and the ULCL branch point are at the same position.
  • the roaming destination SMF selects the main anchor point based on the user terminal's DNN information and network slicing information, and generates local offloading rules (visited location's FAR and PDR) based on the flow generation path corresponding to DNAI.
  • the roaming SMF establishes communication with the first auxiliary anchor point, it establishes a connection with the ULCL branch point. The process will not be described in detail here.
  • the home SMF after the home SMF completes selecting the second secondary anchor point, it sends a PDU session establishment response message to the roaming location.
  • the roaming SMF selects the branch point UPF and establishes a downlink data transmission channel for the second auxiliary anchor point, thereby ensuring the channel between the user terminal and the anchor point.
  • the offloading method in the roaming scenario before S904 also includes the roaming SMF acquiring the SM policy of the user terminal.
  • the following describes the process by which the roaming SMF obtains the SM policy of the user terminal.
  • the above process can be implemented specifically through the following S1301-S1302.
  • the roaming SMF determines the home PCF according to the current operator's LBO configuration.
  • the roaming SMF sends first request information to the home PCF.
  • the first request information is used to obtain the SM policy of the user terminal.
  • the home PCF authenticates the SM policy, and if the SM policy is legal, sends second information to the roaming SMF.
  • the second information includes the DNAI list signed by the user terminal.
  • the services of the private network are generally stored in the home PCF.
  • the roaming SMF After the roaming SMF receives the second information sent by the home policy control function PCF, it can realize the offloading of private network services to the user terminal.
  • the offloading method in the roaming scenario before S901 also includes the roaming AMF obtaining the first information.
  • the process of obtaining the first information by the roaming AMF is introduced.
  • the above process can be implemented specifically through the following S1401-S1403.
  • the user terminal initiates a PDU session in the roaming area to the AMF in the roaming area.
  • the session carries the user terminal's DNN information, S-NSSAI information, PDU session ID, and user terminal location information.
  • the roaming location AMF selects the roaming location SMF.
  • the roaming AMF selects the roaming SMF based on the DNN information of the user terminal, the S-NSSAI information, and the location of the user terminal.
  • the roaming AMF sends the third information to the NRF, the NRF selects the roaming SMF according to the third information, the NRF sends a first response message to the roaming AMF, and the roaming AMF receives the N
  • the first response message of the RF includes the ID of the roaming SMF.
  • the third information includes: the DNN information of the user terminal and the first indication message; the first indication message is used to instruct the NRF to select the roaming location SMF.
  • the roaming AMF selects the home SMF.
  • the roaming AMF obtains the home province information of the user terminal and the SUPI of the user terminal based on the SUPI information of the user terminal or the Generic Public Subscription Identifier (GPSI) information.
  • the information includes province number segment information.
  • the roaming AMF selects the home SMF based on the user terminal's DNN information, S-NSSAI information, and the user terminal's home province information.
  • the roaming AMF determines the target PLMN to which the user terminal belongs based on the DNN information of the user terminal, the S-NSSAI information, and the PLMN information in the SUPI information of the user terminal.
  • the roaming AMF selects the home SMF based on the target PLMN.
  • the GPSI information is the information obtained by the user terminal from the UDM during the registration process.
  • the roaming AMF sends the fourth information to the NRF, the NRF selects the home SMF according to the fourth information, the NRF sends the second response message to the roaming AMF, and the roaming AMF receives The second response message of the NRF includes the ID of the home SMF.
  • the fourth information includes: DNN information of the user terminal, SUPI information of the user terminal, S-NSSAI information, GPSI information and the second instruction message.
  • the SUPI information of the user terminal includes province number segment information; the second instruction message is used to indicate The NRF selects the home SMF.
  • the roaming AMF sends query request information to the roaming NRF, and the roaming NRF determines the target PLMN to which the user terminal belongs based on the query request information.
  • the roaming NRF determines the home NRF based on the target PLMN to which the user terminal belongs.
  • the home NRF selects the home SMF based on the province number segment information in the DNN, S-NSSAI and user SUPI, and sends a third response message to the NRF to the roaming AMF.
  • the roaming AMF receives the third response message from the NRF.
  • the response message includes the ID of the home SMF.
  • the query request information includes: DNN information of the user terminal, PLMN information in the SUPI information of the user terminal, and S-NSSAI information. The query request information is used to obtain the home SMF.
  • the roaming AMF selects the roaming SMF and the home SMF, thereby ensuring that the roaming SMF and the home SMF establish communication and realizing the offloading of private network services.
  • the offloading process in the roaming scenario includes:
  • the user terminal sends request information for establishing a PDU session to the roaming AMF.
  • the roaming AMF selects the roaming SMF and the home SMF.
  • the roaming AMF and the roaming SMF create an SM context.
  • the roaming AMF sends the first information to the roaming SMF.
  • the roaming SMF selects the home PCF.
  • the roaming SMF determines the home PCF based on the current operator's local offload LBO configuration.
  • the roaming SMF requests the home PCF for the SM policy.
  • the roaming SMF sends first request information to the home PCF, and the first request information is used to obtain the SM policy of the user terminal.
  • the home PCF finds that the user signed a specific DNAI list.
  • the home PCF determines the DNAI list signed by the user terminal based on the first request information.
  • the home PCF returns the DNAI list contracted by the user to the roaming SMF.
  • the home PCF sends the second information to the roaming SMF, and the second information includes the DNAI list signed by the user terminal.
  • the roaming location SMF selects UPF based on the DNAI list.
  • the roaming SMF determines the target UPF as the auxiliary anchor point based on the DNAI list signed by the user terminal.
  • the roaming SMF establishes an N4 session as the main anchor point.
  • the roaming SMF determines that it cannot support the DNAI issued by the home PCC, the roaming SMF initiates a PDU session creation to the home SMF.
  • the roaming SMF if there is no UPF in the roaming UPF controlled by the roaming SMF that supports the DNAI list subscribed by the user terminal, the roaming SMF establishes a PDU session with the home SMF through the second interface.
  • the roaming SMF carries the DNAI list required in the PCC rules and not supported by the roaming SMF.
  • the roaming SMF sends a DNAI list to the home SMF.
  • the home SMF performs UPF selection based on the DNAI list.
  • the home SMF determines the third UPF as the second auxiliary anchor point based on the DNAI list.
  • the third UPF is the home UPF controlled by the home SMF.
  • the home SMF establishes an N4 session with the second secondary anchor point.
  • the home SMF sends a PDU session establishment response to the roaming SMF and returns the DNAI supported by PSA2.
  • the PDU session establishment response message sent by the home SMF to the roaming SMF is the same as S1202 and will not be discussed in detail here.
  • S1515 The roaming SMF establishes an N4 session for the ULCL branch point, which is the same as S1203 and will not be discussed in detail here.
  • S1516 The roaming SMF establishes an AN-side session process with the user terminal. This process is the same as S1204 and will not be discussed in detail here.
  • the roaming SMF updates the psam DL information to the main anchor point.
  • the roaming SMF sends a third indication message to the primary anchor point, which is the same as S1205 and will not be discussed in detail here.
  • the roaming SMF sends the sixth information to the home SMF, which is the same as S1201 and will not be discussed in detail here.
  • the home SMF performs N4 session update with the second auxiliary anchor point.
  • the home SMF receives the CN tunnel information of the second secondary anchor point sent by the second secondary anchor point. This is the same as S1207 and will not be discussed in detail here.
  • the roaming SMF sends a PDU session update response to the home SMF.
  • the home SMF sends the CN tunnel information of the second secondary anchor point to the roaming SMF. This is the same as S1208 and will not be discussed in detail here.
  • the roaming location SMF and ULCL are sent for session update.
  • the roaming SMF sends update information to the ULCL.
  • the roaming SMF selects the first UPF as the main anchor point from at least one UPF controlled by the roaming SMF according to the DNN information and network slice identification of the user terminal.
  • a UPF is used to offload public network services from user terminals.
  • the roaming SMF can allocate the public network services of the user terminal to the first UPF for processing.
  • the roaming SMF determines the target UPF as the auxiliary anchor point based on the DNAI list signed by the user terminal.
  • the target UPF is used to offload the private network service of the user terminal.
  • the roaming SMF can allocate the private network services of the user terminal to the target UPF for processing.
  • both the public network services and the private network services in the user terminal are processed in the roaming area, thus realizing the network offloading of the user terminal in the roaming area.
  • Embodiments of the present application can divide the functional modules of the offloading device in the roaming scenario according to the above method examples.
  • each functional module can be divided corresponding to each function, or two or more functions can be integrated into one in the processing module.
  • the above integrated modules can be implemented in the form of hardware or software function modules.
  • the division of modules in the embodiment of this application is schematic and is only a logical function division. There may be other division methods in actual implementation.
  • FIG. 16 it is a schematic structural diagram of a traffic distribution device 160 in a roaming scenario provided by an embodiment of the present application.
  • the offloading device 160 in this roaming scenario includes: a receiving unit 1601, a processing unit 1602, and a sending unit 1603.
  • the receiving unit 1601 is configured to receive the first information sent by the AMF of the roaming location.
  • the first information includes the DNN information of the user terminal and the network slice identifier;
  • the processing unit 1602 is configured to receive the first information from the roaming location based on the DNN information of the user terminal and the network slice identifier.
  • the second information includes the DNAI list signed by the user terminal; the processing unit 1602 is also used to determine the target UPF as a secondary anchor point according to the DNAI list signed by the user terminal, and the target UPF is used to offload the private network service of the user terminal.
  • the processing unit 1602 is also configured to, if there is a UPF in the roaming UPF controlled by the roaming SMF that supports the DNAI list subscribed by the user terminal, select the second UPF from at least one UPF controlled by the roaming SMF according to the DNAI list.
  • UPF serves as the first auxiliary anchor point, and the second UPF is used to offload the private network services of user terminals.
  • the processing unit 1602 is also configured to send the second information and the first instruction to the home SMF if there is no UPF supporting the DNAI list subscribed by the user terminal in the roaming UPF controlled by the roaming SMF. It is used to instruct the home SMF to determine the third UPF as the second auxiliary anchor point based on the DNAI list signed by the user terminal.
  • the third UPF is the home UPF controlled by the home SMF.
  • the third UPF is used to offload the terminal's private network service.
  • the three UPFs are connected to the ULCL branch point through the first interface; where the home SMF is the roaming AMF determined based on the user terminal's DNN information, S-NSSAI information and the user terminal's home province information; or the home SMF is the roaming location
  • the AMF is determined based on the user terminal's DNN information, S-NSSAI information and the user terminal's home PLMN information.
  • the processing unit 1602 is also configured to establish a session with the home SMF through the second interface according to the ID of the home SMF, where the second interface is used to connect the home SMF and the home SMF; the first information also includes The ID of the home SMF; the sending unit 1603 is configured to send the second information and the first instruction to the home SMF through the second interface.
  • the processing unit 1602 is also configured to determine the home PCF according to the current operator's LBO configuration; the sending unit 1603 is also configured to send the first request information to the home PCF, and the first request information is used to obtain the user terminal SM strategy.
  • the processing unit 1602 may be a processor or a controller. It may implement or execute the various illustrative logical blocks, modules, and circuits described in connection with this disclosure.
  • the processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the communication unit may be a transceiver circuit or a communication interface.
  • the storage module may be a memory.
  • Embodiments of the present application also provide a computer-readable storage medium. Instructions are stored in the computer-readable storage medium. When the computer executes the instructions, the computer executes each step in the method flow shown in the above method embodiment.
  • An embodiment of the present application also provides a chip.
  • the chip includes a processor and a communication interface. The communication interface is coupled to the processor.
  • the processor is used to run computer programs or instructions to implement the offloading method in the roaming scenario in the above method embodiment.
  • Embodiments of the present application provide a computer program product containing instructions. When the instructions are run on a computer, they cause the computer to execute the offloading method in the roaming scenario in the above method embodiment.
  • the computer-readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard drive. Random Access Memory (RAM), Read-Only Memory (ROM), Erasable Programmable Read Only Memory (EPROM), register, hard disk, optical fiber, portable and compact Compact Disc Read-Only Memory (CD-ROM), optical storage device, magnetic storage device, or a suitable combination of the above, or any other form of computer-readable storage medium of value in the field.
  • RAM Random Access Memory
  • ROM Read-Only Memory
  • EPROM Erasable Programmable Read Only Memory
  • register hard disk
  • optical fiber portable and compact Compact Disc Read-Only Memory
  • CD-ROM compact Compact Disc Read-Only Memory
  • optical storage device magnetic storage device, or a suitable combination of the above, or any other form of
  • An exemplary storage medium is coupled to the processor such that the processor can read information from the storage medium and write information to the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and storage medium may be located in an Application Specific Integrated Circuit (ASIC).
  • ASIC Application Specific Integrated Circuit
  • a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

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Abstract

La présente invention se rapporte au domaine des communications, et concerne un procédé et un appareil de délestage dans un scénario d'itinérance, et un support de stockage, destinés à être utilisés dans le délestage d'un réseau d'itinérance. Le procédé comprend les étapes suivantes : une SMF d'itinérance reçoit des premières informations envoyées par une AMF d'itinérance ; en fonction d'informations de DNN et d'un identifiant de tranche de réseau d'un terminal d'utilisateur, la SMF d'itinérance sélectionne une première UPF parmi au moins une UPF, qui est contrôlée par la SMF d'itinérance, en tant que point d'ancrage primaire, la première UPF étant utilisée pour le délestage d'un service de réseau public du terminal d'utilisateur ; la SMF d'itinérance reçoit des deuxièmes informations envoyées par une fonction de contrôle de politique (PCF) domestique ; et selon une liste DNAI signée par le terminal d'utilisateur, la SMF d'itinérance détermine une UPF cible en tant que point d'ancrage secondaire, l'UPF cible étant utilisée pour le délestage d'un service de réseau privé du terminal d'utilisateur. La présente invention est utilisée dans le processus de délestage de service du terminal d'utilisateur.
PCT/CN2023/107328 2022-07-21 2023-07-13 Procédé et appareil de délestage dans un scénario d'itinérance, et support de stockage WO2024017143A1 (fr)

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QINMING CHEN, PAN GUIXIN; CHEN FENG: "5G 2B2C Private Network Solutions", DESIGNING TECHNIQUES OF POSTS AND TELECOMMUNICATIONS, DESIGNING INSTITUTE OF MPT OF CHINA, CN, no. 6, 20 June 2022 (2022-06-20), CN , pages 45 - 50, XP093130626, ISSN: 1007-3043, DOI: 10.12045/j.issn.1007-3043.2022.06.009 *

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