WO2024055813A1 - Procédé de déploiement d'élément de réseau de fonction de plan utilisateur (upf), procédé de traitement de signalisation et système - Google Patents

Procédé de déploiement d'élément de réseau de fonction de plan utilisateur (upf), procédé de traitement de signalisation et système Download PDF

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Publication number
WO2024055813A1
WO2024055813A1 PCT/CN2023/113859 CN2023113859W WO2024055813A1 WO 2024055813 A1 WO2024055813 A1 WO 2024055813A1 CN 2023113859 W CN2023113859 W CN 2023113859W WO 2024055813 A1 WO2024055813 A1 WO 2024055813A1
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Prior art keywords
network element
upf network
edge
session
central
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PCT/CN2023/113859
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English (en)
Chinese (zh)
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周爱东
周晟
韩波
徐阳
黄正刚
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中兴通讯股份有限公司
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Publication of WO2024055813A1 publication Critical patent/WO2024055813A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/10—Dynamic resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools

Definitions

  • the present disclosure relates to the field of core networks, and specifically to a user plane function UPF network element deployment, signaling processing method and system.
  • the User Plane Function (UPF) in the 5G core network mainly completes the routing and forwarding of user plane data packets, data and service identification, action and policy execution.
  • UPF completes the session, policy, billing, media forwarding and other business capabilities of the 3rd Generation Partner Project (3GPP) standard specification, and at the same time, serves as the connection anchor between 5G networks and multi-access edge computing. Point, all core network data must be forwarded by UPF before it can flow to the external network.
  • 3GPP 3rd Generation Partner Project
  • Figure 1 is a basic network structure diagram based on 5G and UPF network elements. As shown in Figure 1, it is based on the C/U separated architecture of the 5G core network (5G Core, 5GC for short), and the control plane network function (Network Function, NF for short) ) network elements are deployed centrally in the Data Center (DC), and UPF network elements are deployed at the edge of the network.
  • 5G Core 5G Core
  • 5GC 5G Core
  • NF Network Function
  • UPF is one of the most important network elements of the core network and the core function of 5G data processing and forwarding. It must have carrier-grade product quality. Moreover, UPF, as an important network node that promotes the integration of 5G and thousands of industries, is gradually moving from the core network to the campus of industry users. Government and enterprise customers are very interested in the large bandwidth, low latency, high reliability, and high security of applications. need.
  • UPF network elements not only require UPF network elements to meet the features and functions required by the 3GPP architecture, but also meet performance, operation and maintenance, networking and other requirements; especially in edge campus applications, there is an urgent need for a low-cost, rapid deployment , lightweight UPF that facilitates operation and maintenance, and also needs to achieve high-reliability backup and disaster recovery capabilities to meet the unique 5G applications in enterprise campuses.
  • Embodiments of the present disclosure provide a user plane function UPF network element deployment method, signaling processing method, system, storage medium and electronic device, to at least solve the need in related technologies for a lightweight, low-cost, rapid deployment, and convenient operation and maintenance.
  • the problem of magnitude UPF is a problem of magnitude UPF.
  • a user plane function UPF network element deployment method includes: The user plane function UPF network element is decoupled into a central UPF network element and an edge UPF network element; the central UPF network element and the edge UPF network element are deployed separately; an Nx connection is established between the center UPF network element and the edge UPF network element, where, The central UPF network element is used to communicate signaling messages and service messages with edge UPF network elements through Nx connections.
  • a signaling processing method is provided, which is applied to an edge UPF network element.
  • the method includes: receiving session request signaling sent by a Session Management Function (Session Management Function, referred to as SMF) network element; Session request signaling is sent to the central user plane function UPF network element through the Nx connection.
  • SMF Session Management Function
  • the central UPF network element and the edge UPF network element are decoupled from the UPF network element, and the central UPF network element and the edge UPF network element are deployed separately.
  • a signaling processing method is provided, which is applied to a central UPF network element.
  • the method includes: receiving session request signaling sent by an edge UPF network element through an Nx connection, wherein the session request signaling It is received by the edge UPF network element from the session management function SMF network element.
  • the central UPF network element and the edge UPF network element are decoupled from the UPF network element, and the central UPF network element and the edge UPF network element are deployed separately; according to the session request information Determine the IP address and service tunnel resources of the edge UPF network element; send session response signaling to the edge UPF network element through the Nx connection, where the session response signaling contains the IP address and service tunnel resources.
  • a signaling processing system includes: an edge UPF network element, configured to receive session request signaling sent by the session management function SMF network element, and transmit the session request signaling through the Nx connection.
  • the command is sent to the central user plane function UPF network element, receives the session response signaling returned by the central UPF network element after processing the session request signaling through the Nx connection, and forwards the session response signaling to the SMF network element;
  • the central UPF network element uses It receives the session request signaling sent by the edge UPF network element through the Nx connection, determines the IP address and service tunnel resources of the edge UPF network element according to the session request signaling, and sends the session response signaling to the edge UPF network element through the Nx connection, where , the session response signaling contains IP addresses and service tunnel resources; among them, the central UPF network element and the edge UPF network element are decoupled from the UPF network element, and the central UPF network element and the edge UPF network element are deployed separately.
  • a computer-readable storage medium is also provided.
  • a computer program is stored in the storage medium, wherein the computer program executes the steps in any of the above method embodiments when run by a processor.
  • an electronic device including a memory and a processor.
  • a computer program is stored in the memory, and the processor is configured to run the computer program to perform the steps in any of the above method embodiments. .
  • Figure 1 is a basic network structure diagram based on 5G and UPF network elements
  • FIG. 2 is a hardware structural block diagram of the user plane function UPF network element deployment according to an embodiment of the present disclosure
  • Figure 3 is a flow chart of user plane function UPF network element deployment according to an embodiment of the present disclosure
  • Figure 4 is a flow chart of an edge UPF network element signaling processing method in an embodiment of the present disclosure
  • Figure 5 is a flow chart of a central UPF network element signaling processing method in an embodiment of the present disclosure
  • Figure 6 is a network architecture diagram of a user plane function UPF network element in an embodiment of the present disclosure
  • Figure 7 is the Nx signaling message communication interface between the edge UPF network element and the central UPF network element in the embodiment of the present disclosure
  • Figure 8 is the Nx service message communication interface between the edge UPF network element and the central UPF network element in the embodiment of the present disclosure
  • Figure 9 is a schematic diagram of the session and business process between edge UPF and center UPF in another embodiment of the present disclosure.
  • Figure 10 is a schematic diagram of the disaster recovery process in an edge UPF abnormal scenario in another embodiment of the present disclosure.
  • Figure 11 is a schematic diagram of the disaster recovery process in the abnormal scenario of central UPF in another embodiment of the present disclosure.
  • Figure 12 is a block diagram of a signaling processing system according to an embodiment of the present disclosure.
  • FIG. 2 is a hardware structural block diagram of the user plane function UPF network element deployment according to an embodiment of the present disclosure.
  • the hardware single board can include one or more (only shown in Figure 2 A) processor 202 (the processor 202 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 204 for storing data, wherein the above-mentioned mobile terminal may also include a processor for communication Functional transmission device 206 and input and output device 208.
  • processor 202 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA
  • a memory 204 for storing data
  • the above-mentioned mobile terminal may also include a processor for communication Functional transmission device 206 and input and output device 208.
  • FIG. 2 is only illustrative, and it does not limit the structure of the above-mentioned mobile terminal.
  • the mobile terminal may also include more or fewer components than shown in FIG. 2 , or have a different configuration than shown in FIG. 2 .
  • the memory 204 can be used to store computer programs, for example, software programs and modules of application software, such as the computer programs corresponding to the user plane function UPF network element deployment in the embodiment of the present disclosure.
  • the processor 202 runs the computer programs stored in the memory 204 , thereby executing various functional applications and load balancing processing, that is, implementing the above method.
  • Memory 204 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory.
  • the memory 204 may further include memory located remotely relative to the processor 202, and these remote memories may be connected to the mobile terminal through a network. Examples of the above-mentioned networks include but are not limited to the Internet, intranets, local area networks, mobile communication networks and combinations thereof.
  • Transmission device 206 is used to receive or send data via a network.
  • Specific examples of the above-mentioned network may include wireless networks provided by communication providers.
  • the transmission device 206 includes a network adapter (Network Interface Controller, NIC for short), which can be connected to other network devices through a base station to communicate with the Internet.
  • the transmission device 206 may be a radio frequency (Radio Frequency, RF for short) module, which is used to communicate with the Internet wirelessly.
  • NIC Network Interface Controller
  • FIG. 3 is a flow chart of user plane function UPF network element deployment according to an embodiment of the present disclosure. As shown in Figure 3, the process includes the following steps:
  • Step S302 Decouple the user plane function UPF network element into a central UPF network element and an edge UPF network element;
  • Step S304 deploy the central UPF network element and the edge UPF network element separately;
  • Step S306 Establish an Nx connection between the central UPF network element and the edge UPF network element.
  • the central UPF network element is used to communicate signaling messages and service messages with the edge UPF network element through the Nx connection.
  • the deployment method further includes:
  • Step S308 configure the IP address pool of the edge UPF network element through the central UPF network element, where the IP address pool is used to indicate the IP address in the campus network;
  • Step S310 deliver the IP address pool to the edge UPF network element through the Nx connection.
  • the central UPF network element in the above step S306 communicates signaling messages and service messages with the edge UPF network element through the Nx connection, which may specifically include:
  • PFCP Packet Forwarding Control Protocol
  • the service message communication is performed in the Nx connection according to a tunnel protocol, wherein the tunnel protocol includes: User Datagram Protocol (User Datagram Protocol, referred to as UDP), GPRS Tunneling Protocol (GPRS Tunneling Protocol, referred to as GTP) or universal routing Encapsulation (Generic Routing Encapsulation, GRE for short) protocol.
  • UDP User Datagram Protocol
  • GTP GPRS Tunneling Protocol
  • GRE Generic Routing Encapsulation
  • GRE General Packet Radio Service
  • the deployment method further includes:
  • Step S312 deploy at least one backup center UPF network element and at least one backup edge UPF network element;
  • Step S31 establish the Nx connection between the backup center UPF network element and the edge UPF network element;
  • Step S316 Establish the Nx connection between the backup center UPF network element and the central UPF network element, wherein the central UPF network element is used to synchronize the session context to the backup center through the Nx connection.
  • UPF network element
  • Step S318 Establish the Nx connection between the backup edge UPF network element and the central UPF network element, wherein the central UPF network element is also used to synchronize flow context to the backup network element through the Nx connection.
  • Edge UPF network element Establish the Nx connection between the backup edge UPF network element and the central UPF network element, wherein the central UPF network element is also used to synchronize flow context to the backup network element through the Nx connection.
  • Edge UPF network element Establish the Nx connection between the backup edge UPF network element and the central UPF network element, wherein the central UPF network element is also used to synchronize flow context to the backup network element through the Nx connection.
  • Edge UPF network element is also used to synchronize flow context to the backup network element through the Nx connection.
  • the originally complex and expensive UPF network element can be decoupled into a lightweight central UPF network element and an edge UPF network element, thereby reducing the deployment of a single UPF network element. and operation and maintenance costs, improving deployment efficiency; at the same time, through the above steps S312 to step S316, the central UPF network element and the edge UPF network element can be backed up separately, which enhances the reliability and disaster recovery capability of the UPF network element.
  • FIG. 4 is a flow chart of the signaling processing method of edge UPF network elements in the embodiment of the present disclosure, as shown in Figure 4 , the process includes the following steps:
  • Step S402 Receive the session request signaling sent by the session management function SMF network element;
  • Step S404 Send the session request signaling to the central user plane function UPF network element through the Nx connection, where the central UPF network element and the edge UPF network element are decoupled from the UPF network element, and the The central UPF network element and the edge UPF network element are deployed separately;
  • Step S406 Receive the session response signaling returned by the central UPF network element after processing the session request signaling through the Nx connection;
  • Step S408 Forward the session response signaling to the SMF network element.
  • the session request signaling may specifically include: a session creation request, a session change request, or a session release request.
  • the edge UPF can also connect to the 5G core network SMF network element, UPF network element, UE and other I-UPF, ULCL main anchor point UPF, etc. through interfaces such as N3, N4, N6, and N9 to realize campus UPF.
  • Business offloading including UL-CL (Uplink Classifier) uplink offloading, IPv6 multi-homing offloading, Local Area Data Network (LADN) and other 3GPP standardized business processes.
  • UL-CL Uplink Classifier
  • IPv6 multi-homing offloading IPv6 multi-homing offloading
  • LADN Local Area Data Network
  • the method may further include:
  • session response signaling includes: session creation response, session change response or session release response;
  • the session response signaling includes the IP address and service tunnel resources of the edge UPF network element, where the edge UPF The IP address of the network element is allocated by the SMF network element or the central UPF network element, and the service tunnel resource is allocated by the central UPF network element.
  • the method may further include:
  • a flow context request sent by the central UPF network element through the Nx connection where the flow context request includes: a flow context creation request, a flow context change request or a flow context release request;
  • IP address pool Publish, change or delete the routing table of the IP address pool according to the flow context request, where the IP address pool is used to indicate IP addresses in the campus network;
  • a flow context response is sent to the central UPF network element through the Nx connection, where the flow context response includes: a flow context creation response, a flow context change response or a flow context release response.
  • the method further includes:
  • the upstream traffic as second upstream traffic, wherein the second upstream traffic is used for business access to the Internet outside the campus network;
  • the method before sending the service access result to the edge user, the method may further include:
  • the second uplink traffic is sent to the center UPF network element or the core network UPF network element, and the second downlink traffic sent by the center UPF network element or the core network UPF network element is received, wherein the The second downlink traffic is the result of business access to the Internet.
  • the uplink traffic may specifically be service data access requests to the Internet or campus network, and the downlink traffic may be service data access responses returned by websites or service providers.
  • the edge UPF network elements may directly forward uplink traffic within the campus network. traffic, reducing network access delay, and achieving data isolation to ensure the security of network access.
  • the method after sending the uplink traffic to the central UPF network element, the core network UPF network element or the campus network, the method further includes:
  • Policy control and billing are performed based on the traffic statistics information.
  • the method further includes: sending the session request signaling according to the Data Packet Forwarding Control Protocol PFCP protocol, and receiving the session response signaling according to the PFCP protocol; and/or receiving the session response signaling according to the tunneling protocol.
  • PFCP Data Packet Forwarding Control Protocol
  • the tunnel protocol includes: User Datagram Protocol UDP, GPRS Tunnel Protocol GTP or General Routing Encapsulation GRE protocol.
  • the method further includes:
  • the central UPF network element is the main central UPF Network element, the main central UPF network element corresponds to at least one backup central UPF network element;
  • one of the at least one backup central UPF network element is set as the main central UPF network element.
  • the working status of the central UPF network element can be detected through the edge UPF network element, and the working status of the active central UPF network element can also be detected through the backup central UPF network element.
  • the backup center UPF network element and the active center UPF network element can also establish an Nx connection, and perform data backup such as session context through the Nx connection.
  • FIG. 5 is a flow chart of the signaling processing method of the central UPF network element in the embodiment of the present disclosure, as shown in Figure 5 , the process includes the following steps:
  • Step S502 Receive session request signaling sent by the edge UPF network element through the Nx connection, where the session request signaling is received by the edge UPF network element from the session management function SMF network element, and the central UPF network element and The edge UPF network element is obtained by decoupling the UPF network element, and the center UPF network element and the edge UPF network element are deployed separately;
  • Step S504 Determine the IP address and service tunnel resources of the edge UPF network element according to the session request signaling
  • Step S506 Send session response signaling to the edge UPF network element through the Nx connection, where the session response signaling includes the IP address and the service tunnel resource.
  • the central UPF can also interface with the 5G core network SMF network element, the Internet, etc. through N3, N4, N6 and other interfaces, ensuring the realization of 3GPP standardized business processes.
  • step S504 may specifically include:
  • the service tunnel resource is allocated to the edge UPF network element according to the session request signaling.
  • step S506 the method further includes:
  • the flow context request includes: a flow context creation request, a flow context change request or a flow context release request;
  • the edge UPF network element Receives the flow context response sent by the edge UPF network element through the Nx connection, wherein the flow context response is after the edge UPF network element creates, changes or releases the forwarding table or flow table according to the flow context request. , and is sent after publishing, changing or deleting the routing table of the IP address pool.
  • the method after receiving the flow context response sent by the edge UPF network element through the Nx connection, the method further includes:
  • the method further includes:
  • the traffic statistics information reported by the edge UPF network element is received through the Nx connection, where the traffic statistics information is obtained by the edge UPF network element performing traffic statistics based on business access in the campus network and the Internet respectively.
  • the method further includes: receiving the session request signaling according to the Data Packet Forwarding Control Protocol PFCP protocol, and sending the session response signaling according to the PFCP protocol; and/or sending the session response signaling according to the tunnel protocol.
  • PFCP Data Packet Forwarding Control Protocol
  • the tunnel protocol includes: User Datagram Protocol UDP, GPRS Tunnel Protocol GTP or General Routing Encapsulation GRE protocol.
  • the method further includes:
  • edge UPF network element is the main edge UPF network element, and the main edge UPF network element corresponds to at least one backup edge UPF network element;
  • one of the at least one backup edge UPF network element is set as the main edge UPF network element.
  • the working status of the edge UPF network element can also be detected through the SMF network element, and a backup edge UPF network element can be directly designated by the SMF network element as the new active edge UPF network element.
  • edge UPF by backing up the edge UPF network elements, it is possible to ensure that user services and data traffic are not affected as long as there are still normally functioning edge UPF network elements.
  • edge UPF When the edge UPF is abnormal, data can also be restored. Lossless migration and high reliability.
  • Figure 1 is a basic network structure diagram based on 5G and UPF network elements.
  • the central UPF network element and edge UPF network element in the embodiment of the present disclosure are decoupled from a standard UPF network element in Figure 1.
  • the central UPF network element The edge UPF network element is deployed at the location of the session anchor UPF.
  • Figure 6 is a network architecture diagram of a user plane function UPF network element in an embodiment of the present disclosure. As shown in Figure 6, the network architecture includes: multiple lightweight and reliable UPFs and multiple central UPFs.
  • the lightweight and reliable UPF is equivalent to the edge UPF network element in the above embodiment; an Nx connection is established between the edge UPF network element and the central UPF network element, and the edge UPF network element and the central UPF network element are specified in 3GPP. N3, N4, N6, and N9 communicate with other network elements within the core network.
  • the N4 interface is located between the SMF network element and the edge UPF network element or the central UPF network element; the N3 interface is located between the 5G access network and the edge UPF; N6 is a protocol between the internal network side and the external network side.
  • the N6 interface is located between the central UPF network element and the Internet, and between the edge UPF network element and the campus network; the N9 interface is located between the edge UPF network element and other standard UPF network elements.
  • a method for deploying edge UPF network elements and central UPF network elements includes the following steps:
  • Step S1 center UPF and edge UPF are deployed separately;
  • Step S2 the central UPF establishes Nx connection with the edge UPF
  • Step S3 Configure the IP address pool, TEIDU and other information of the edge UPF on the central UPF, and deliver them to the edge UPF through the Nx connection;
  • Step S4 The central UPF delivers the new UPF service configuration to the edge UPF through the Nx connection;
  • Step S5 The signaling messages between the center UPF and the edge UPF are communicated using the PFCP protocol;
  • Step S6 Service packets between the center UPF and the edge UPF are communicated using a tunnel protocol.
  • the deployment structure in step S1 may be specifically shown in Figure 6 .
  • Figure 7 is an Nx signaling message communication interface between the edge UPF network element and the central UPF network element in the embodiment of the present disclosure.
  • the central UPF and the edge UPF communicate with each other through the Nx signaling message communication interface shown in Figure 7.
  • the Nx signaling message communication interface uses the PFCP protocol.
  • the central UPF and the edge UPF communicate with each other through the Nx service message communication interface, and the Nx service message communication interface uses a tunnel protocol.
  • tunnel protocol types include, but are not limited to, custom UDP protocol tunnels, GTP protocol tunnels, GRE protocol tunnels, etc.
  • Figure 8 is an Nx service message communication interface between the edge UPF network element and the central UPF network element in the embodiment of the present disclosure. As shown in Figure 8, the Nx service message communication interface uses a custom UDP protocol tunnel.
  • the InnerHead in Figure 8 adopts a 16-byte structure, as shown in Table 1 below, and the specific content can be adjusted.
  • InnerType in Table 1 is used to characterize the message type.
  • Exemplary, customized message types are shown in Table 2 below, but are not limited to Table 2.
  • FIG. 9 is a schematic diagram of the session and business process between edge UPF and center UPF in another embodiment of the present disclosure. As shown in Figure 9, the process includes the following steps:
  • Step S901 SMF triggers the establishment of N4 session process
  • Step S902 edge UPF1 receives the N4 Session Establishment/Modification/Release Request (N4 session creation/modification/release request) sent by SMF;
  • Step S903 edge UPF1 sends Session Establishment/Modification/Release Request (session creation/modification/release request) to center UPF1;
  • Step S904 the center UPF1 completes the creation/change/release operations such as allocating IP addresses or accepting SMF allocation of IP addresses, allocating service tunnel resources, etc.;
  • Step S905 the center UPF1 sends a Session Establishment/Modification/Release Response (session creation/modification/release response) to the edge UPF1;
  • Step S906 the center UPF1 sends Session Context Synchronizing (session context synchronization) to the center UPF2 to complete the synchronization backup and response confirmation of user session information, policy charging and other contexts;
  • edge UPF1 completes the creation/change/release of the N4 session and service tunnel, and sends the N4 Session Establishment/Modification/Release Response (N4 Session Creation/Modification/Release Response) to SMF;
  • Step S908 the center UPF1 sends a FlowContext Establishment/Modification/Release Request (flow context creation/change/release request) to the edge UPF1 to complete the creation/change/release of the user forwarding table flow table;
  • Step S909 the center UPF1 sends Flow Context Synchronizing (flow context synchronization) to UPFn in the edge UPF cluster to complete the information backup of the creation/change/release of the user forwarding table flow table.
  • Step S910 The edge UPF1 completes the local route publishing, change or deletion of the user IP.
  • Step S911 edge UPF1 sends Flow Context Establishment/Modification/Release Response (flow context creation/modification/release response) to central UPF1 to complete the issuance confirmation of the user forwarding table flow table;
  • Step S912 The edge user accesses campus business traffic and sends the uplink traffic to the edge UPF1 through the N3 interface.
  • the edge UPF1 sends the user traffic to the campus network through the N6 interface based on the session and rule information; the downlink traffic of the campus network is also sent through the N3 interface. to the user.
  • Edge UPF1 completes local traffic statistics and information reporting, and completes business information such as billing policies;
  • Step S913 The edge user accesses the Internet large network service traffic and sends the uplink traffic to the edge UPF1 through the N3 interface.
  • the edge UPF1 sends the user traffic to the central UPF or other core network UPF through the N9 interface based on the session and rule information; the Internet network Downstream traffic is also received through the N9 interface and sent to users through the N3 interface.
  • Edge UPF1 completes traffic statistics and information reporting, and completes business information such as charging policies.
  • Figure 10 is a schematic diagram of the disaster recovery process in an edge UPF abnormal scenario in another embodiment of the present disclosure.
  • the user's session and business process are consistent with the above steps S901 to S913.
  • the SMF network element or the central UPF network element detects the working status of the edge UPF.
  • edge UPFn is synchronously triggered to be selected as the user backup UPF.
  • the disaster recovery process in the edge UPF abnormal scenario includes the following steps:
  • Step S1001 SMF triggers the establishment of N4 session process
  • Step S1002 the edge UPFn receives the N4 Session Establishment/Modification/Release Request (N4 Session Creation/Modification/Release Request) sent by SMF;
  • Step S1003 edge UPFn sends Session Establishment/Modification/Release Request (Session creation/change/release request) to center UPF1;
  • Step S1004 the center UPF1 completes the creation/change/release operations such as allocating IP addresses or accepting SMF allocation of IP addresses, allocating service tunnel resources, etc.;
  • Step S1005 the center UPF1 sends a Session Establishment/Modification/Release Response (session creation/modification/release response) to the edge UPFn;
  • Step S1006 the edge UPFn completes the creation/change/release of the N4 session and service tunnel, and sends the N4 Session Establishment/Modification/Release Response (N4 Session Creation/Modification/Release Response) to the SMF;
  • Step S1007 the center UPF1 sends Session Context Synchronizing (session context synchronization) to the center UPF2 to complete the synchronization backup and response confirmation of user session information, policy charging and other contexts;
  • Session Context Synchronizing session context synchronization
  • Step S1008 the center UPF1 sends a Flow Context Establishment/Modification/Release Request (flow context creation/change/release request) to the edge UPFn to complete the creation/change/release of the user forwarding table flow table;
  • Step S1009 The edge UPFn completes the local route publishing, change or deletion of the user IP
  • Step S1010 the edge UPFn sends the Flow Context Establishment/Modification/Release Response (flow context creation/modification/release response) to the center UPF1 to complete the issuance confirmation of the user forwarding table flow table;
  • Step S1011 The edge user accesses campus business traffic and sends uplink traffic to the edge UPFn through the N3 interface.
  • the edge UPFn sends the user traffic to the campus network through the N6 interface based on the session and rule information; the downlink traffic of the campus network is also sent through the N3 interface. to the user.
  • the edge UPFn completes local traffic statistics and information reporting, and completes business information such as charging policies;
  • Step S1012 The edge user accesses Internet large network business traffic and sends uplink traffic to the edge UPFn through the N3 interface.
  • the edge UPFn sends the user traffic to the central UPF or other core network UPF through the N9 interface based on the session and rule information; the Internet network Downstream traffic is also received through the N9 interface and sent to users through the N3 interface.
  • the edge UPFn completes traffic statistics and information reporting, and completes business information such as charging policies.
  • the method also includes: the center UPF1 sends Flow Context Synchronizing (flow context synchronization) to other edge UPFs in the edge UPF cluster to complete the creation/change/release of the user forwarding table flow table. information backup.
  • the center UPF1 sends Flow Context Synchronizing (flow context synchronization) to other edge UPFs in the edge UPF cluster to complete the creation/change/release of the user forwarding table flow table. information backup.
  • Figure 11 is a schematic diagram of the disaster recovery process in a central UPF abnormal scenario in another embodiment of the present disclosure.
  • the edge UPF network element and the center UPF network element are normal, the user's session and business process are consistent with the above steps S901 to step S913.
  • the edge UPF detects that the center UPF is abnormal, it triggers the selection of center UPF2 As the primary center UPF.
  • Step S1101 SMF triggers the establishment of N4 session process
  • Step S1102 edge UPF1 receives the N4 Session Establishment/Modification/Release Request (N4 Session Creation/Modification/Release Request) sent by SMF;
  • edge UPF1 sends Session Establishment/Modification/Release Request (session creation/modification/release request) to center UPF2;
  • Step S1104 the center UPF2 enables local backup information, allocates IP addresses or accepts SMF allocation of IP addresses, allocates service tunnel resources and other creation/change/release operations;
  • Step S1105 the center UPF2 sends Session Establishment/Modification/Release Response (session create/change/release response) to edge UPF1;
  • Step S1106, edge UPF1 completes the creation/change/release of the N4 session and service tunnel, and sends the N4 Session Establishment/Modification/Release Response (N4 Session Creation/Modification/Release Response) to SMF;
  • Step S1107 the center UPF2 sends a Flow Context Establishment/Modification/Release Request (flow context creation/change/release request) to the edge UPF1 to complete the creation/change/release of the user forwarding table flow table;
  • Step S1108 the center UPF2 sends Flow Context Synchronizing (flow context synchronization) to UPFn in the edge UPF cluster to complete the information backup of the creation/change/release of the user forwarding table flow table.
  • Step S1109 Edge UPF1 completes the local route publishing, change or deletion of the user IP
  • Step S1110 edge UPF1 sends Flow Context Establishment/Modification/Release Response (flow context creation/modification/release response) to center UPF2 to complete the issuance confirmation of the user forwarding table flow table;
  • Step S1111 Edge users access campus business traffic and send uplink traffic to edge UPF1 through the N3 interface.
  • Edge UPF1 sends user traffic to the campus network through the N6 interface based on session and rule information; downlink traffic of the campus network is also sent through the N3 interface. to the user.
  • Edge UPF1 completes local traffic statistics and information reporting, and completes business information such as billing policies;
  • Step S1112 The edge user accesses the Internet large network business traffic and sends the uplink traffic to the edge UPF1 through the N3 interface.
  • the edge UPF1 sends the user traffic to the center UPF2 or other core network UPF through the N9 interface based on the session and rule information; the Internet network Downstream traffic is also received through the N9 interface and sent to users through the N3 interface.
  • Edge UPF1 completes traffic statistics and information reporting, and completes business information such as charging policies.
  • FIG. 12 is a block diagram of the signaling processing system according to the embodiment of the present disclosure.
  • the system includes: a central UPF network element 1202 and an edge UPF network. Element 1204, wherein the center UPF network element 1202 and the edge UPF network element 1204 are obtained by decoupling UPF network elements, and the center UPF network element 1202 and the edge UPF network element 1204 are deployed separately;
  • the edge UPF network element 1204 is configured to receive the session request signaling sent by the session management function SMF network element, and send the session request signaling to the central UPF network element through the Nx connection;
  • the central UPF network element 1202 is configured to determine the IP address and service tunnel resources of the edge UPF network element according to the session request signaling, and send session response signaling to the edge UPF network element through the Nx connection. , wherein the session response signaling includes the IP address and the service tunnel resource;
  • the edge UPF network element 1204 is also used to forward the session response signaling to the SMF network element.
  • the edge UPF network element 1202 communicates with the center UPF network element through Nx connection for signaling message communication and service message communication with the edge UPF network element.
  • the edge UPF network element 1202 and the central UPF network element communicate with each other in the Nx connection according to the packet forwarding control protocol PFCP protocol; and/or in the Nx connection according to the tunnel protocol.
  • the service message communication is performed in the Nx connection, wherein the tunnel protocol includes: User Datagram Protocol UDP, GPRS Tunnel Protocol GTP or General Routing Encapsulation GRE protocol.
  • Embodiments of the present disclosure also provide a computer-readable storage medium that stores a computer program, wherein the computer program executes the steps in any of the above method embodiments when run by a processor.
  • the computer-readable storage medium may include but is not limited to: USB flash drive, read-only storage medium
  • Various media that can store computer programs include Read-Only Memory (ROM for short), Random Access Memory (RAM for short), mobile hard disk, magnetic disk or optical disk.
  • Embodiments of the present disclosure also provide an electronic device, including a memory and a processor.
  • a computer program is stored in the memory, and the processor is configured to run the computer program to perform the steps in any of the above method embodiments.
  • the above-mentioned electronic device may further include a transmission device and an input-output device, wherein the transmission device is connected to the above-mentioned processor, and the input-output device is connected to the above-mentioned processor.
  • modules or steps of the present disclosure can be implemented using general-purpose computing devices, and they can be concentrated on a single computing device, or distributed across a network composed of multiple computing devices. They may be implemented in program code executable by a computing device, such that they may be stored in a storage device for execution by the computing device, and in some cases may be executed in a sequence different from that shown herein. Or the described steps can be implemented by making them into individual integrated circuit modules respectively, or by making multiple modules or steps among them into a single integrated circuit module. As such, the present disclosure is not limited to any specific combination of hardware and software.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente divulgation concerne un procédé de déploiement d'élément de réseau de fonction de plan utilisateur (UPF), un procédé de traitement de signalisation et un système. Le procédé de déploiement d'élément de réseau UPF consiste à : découpler un élément de réseau UPF en un élément de réseau UPF central et un élément de réseau UPF périphérique, déployer séparément l'élément de réseau UPF central et l'élément de réseau UPF périphérique, et établir une connexion Nx entre l'élément de réseau UPF central et l'élément de réseau UPF périphérique, l'élément de réseau UPF central étant configuré pour effectuer une communication de paquet de signalisation et une communication de paquet de service avec l'élément de réseau UPF périphérique au moyen de la connexion Nx.
PCT/CN2023/113859 2022-09-15 2023-08-18 Procédé de déploiement d'élément de réseau de fonction de plan utilisateur (upf), procédé de traitement de signalisation et système WO2024055813A1 (fr)

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