WO2023143161A1 - 一种5g核心网服务化接口切片纠错的实现方法 - Google Patents

一种5g核心网服务化接口切片纠错的实现方法 Download PDF

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Publication number
WO2023143161A1
WO2023143161A1 PCT/CN2023/072304 CN2023072304W WO2023143161A1 WO 2023143161 A1 WO2023143161 A1 WO 2023143161A1 CN 2023072304 W CN2023072304 W CN 2023072304W WO 2023143161 A1 WO2023143161 A1 WO 2023143161A1
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network element
udm
initial
smf
target
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PCT/CN2023/072304
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English (en)
French (fr)
Inventor
曹静
吕春桃
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海能达通信股份有限公司
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Publication of WO2023143161A1 publication Critical patent/WO2023143161A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/50—Service provisioning or reconfiguring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H04W8/205—Transfer to or from user equipment or user record carrier

Definitions

  • Embodiments of the present invention relate to the technical field of 5G core network, and in particular, to a method for implementing error correction of service interface slices of 5G core network.
  • the service interface function of 5GC (5G Core Network, 5G core network) is mainly based on NRF (Network Repository Function, network storage function).
  • NRF network elements support the service discovery function, and provide the discovered NF instance information to the request discovery service NF instance. At present, NRF cannot guarantee to select the correct NF instance information in the core network networking scenarios with sliced network elements and non-sliced network elements.
  • the present invention provides a method for implementing error correction of 5G core network service interface slices, so as to realize slice error correction under the premise of normal operation of the 5GC system and ensure normal online access of users.
  • An embodiment of the present invention provides a 5G core network user registration method, including:
  • the AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information according to the initial UDM information fed back by the NRF network element, and sends a user registration request to the initial UDM network element when the user goes online, wherein the said user registration request includes said user's subscription persistent identifier;
  • the AMF network element sends a UDM service request including the subscription permanent identifier to the NRF network element;
  • the NRF network element determines the target UDM network element from each of the UDM network elements according to the UDM service request, and returns the target UDM information of the target UDM network element to the AMF network element, so as to realize the user Successfully registered.
  • the AMF network element before the AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information according to the initial UDM information fed back by the NRF network element, it also includes:
  • the AMF network element sends an initial UDM service request to the NRF network element, and the NRF network element determines the initial UDM network element from among the UDM network elements according to the name of the UDM network element.
  • the NRF network element determines the initial UDM network element from each of the UDM network elements according to the name of the UDM network element, further include:
  • the AMF network element registers the service with the NRF network element
  • Each of the UDM network elements registers services with the NRF network element respectively.
  • the initial UDM network element rejecting user registration according to the user registration request includes:
  • the initial UDM network element determines the target slice to which the user belongs according to the subscription permanent identifier in the user registration request
  • the initial UDM network element rejects user registration.
  • the NRF network element determines a target UDM network element from each of the UDM network elements according to the UDM service request, and returns target UDM information of the target UDM network element to the AMF network element, so as to To achieve the successful registration of the user, including:
  • the NRF network element determines the target slice to which the user belongs according to the subscription permanent identifier in the UDM service request, and determines the UDM network element whose slice is the target slice as the target UDM network element;
  • the NRF network element sends the target UDM information corresponding to the target UDM network element to the AMF network element;
  • the AMF network element sends a link establishment request to the target UDM network element according to the target UDM information, and the target UDM network element replies with a link establishment response to the AMF network element;
  • the AMF network element sends a user registration request to the target UDM network element, and the target UDM network element replies with a registration success response to the AMF network element.
  • the 5G core network also includes at least one SMF network element
  • the AMF network element requests the SMF service from the NRF network element according to the subscription permanent identifier of the user, so as to establish a session between the user and a target SMF network element.
  • the method further includes:
  • the AMF network element sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information according to the initial SMF information fed back by the NRF network element, and the user session establishment request includes the subscription permanent identifier;
  • the initial SMF network element determines the target slice to which the user belongs according to the subscription permanent identifier in the user session establishment request;
  • the initial SMF network element refuses session establishment.
  • the method further includes:
  • Each of the SMF network elements registers services with the NRF network element respectively;
  • the NRF network element determines the initial SMF network element from each of the SMF network elements according to the SMF network element name.
  • the AMF network element requests the SMF service from the NRF network element according to the subscription permanent identifier of the user, so as to realize the session creation between the user and the target SMF network element, including:
  • the AMF network element When the initial SMF network element found by the NRF network element fails to establish a session with the AMF network element, the AMF network element sends an SMF service request including the subscription permanent identifier to the NRF network element;
  • the NRF network element determines a target SMF network element from each of the SMF network elements according to the SMF service request, and returns the target SMF information of the target SMF network element to the AMF network element;
  • the AMF network element implements session creation between the user and the target SMF network element according to the target SMF information.
  • the NRF network element determines a target SMF network element from each of the SMF network elements according to the SMF service request, including:
  • the NRF network element determines the target slice to which the user belongs according to the subscription permanent identifier in the SMF service request, and determines the SMF network element whose slice is the target slice as the target SMF network element.
  • the AMF network element in the 5G core network of the present invention establishes a link relationship with the initial UDM network element corresponding to the initial UDM information according to the initial UDM information fed back by the NRF network element, and sends a user registration request to the initial UDM network element when the user goes online, and the user
  • the registration request contains the user's subscription permanent identifier; when the initial UDM network element rejects the user registration according to the user registration request, the AMF network element sends a UDM service request containing the subscription permanent identifier to the NRF network element; Determine the target UDM network element in each UDM network element, and return the target UDM information of the target UDM network element to the AMF network element to achieve successful user registration and solve the problem of user online failure caused by the fuzzy networking of the existing core network system , Under the premise of the normal operation of the 5G core network, the error correction of slices is automatically completed to ensure the normal online effect of users.
  • FIG. 1 is a flow chart of a method for implementing error correction of a 5G core network service interface slice provided by an embodiment of the present invention
  • FIG. 2 is a schematic diagram of the principle of a method for implementing error correction of 5G core network service interface slices provided by an embodiment of the present invention
  • FIG. 3 is a flow chart of another implementation method for error correction of user-serviced interface slices of the 5G core network provided by an embodiment of the present invention
  • Fig. 4 is a schematic diagram of the principle of another method for implementing error correction of user-serviced interface slices of the 5G core network provided by an embodiment of the present invention.
  • NRF cannot ensure that the correct NF instance information is selected in core network networking scenarios with sliced network elements and non-sliced network elements, resulting in ambiguous networking of the system.
  • the problem of failure is that the system's resilience and fault tolerance are very weak.
  • the invention provides a method for solving the problem of user online failure caused by ambiguous networking of the core network system.
  • Figure 1 is a flow chart of a method for implementing error correction for 5G core network service interface slices provided by an embodiment of the present invention. This embodiment is applicable to the case of 5G core network user registration, and this method can be applied to a 5G core network.
  • the 5G core network may include an AMF network element, an NRF network element, and at least one UDM network element, and each network element may be implemented by software and/or hardware.
  • the method specifically includes the following steps:
  • Step 110 the AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information according to the initial UDM information fed back by the NRF network element, and sends a user registration request to the initial UDM network element when the user goes online, wherein the user registration The request contains the user's subscription persistent identifier.
  • the method for implementing error correction of 5G core network service interface slicing may further include the following steps:
  • the AMF network element sends an initial UDM service request to the NRF network element, and the NRF network element determines the initial UDM network element from each UDM network element according to the name of the UDM network element.
  • the 5G core network service interface slice provided by this embodiment
  • the implementation method of error correction may also include the following steps:
  • the AMF network element registers the service with the NRF network element; each UDM network element registers the service with the NRF network element respectively.
  • an AMF Access and Mobility Management Function, access and mobility management function
  • the UDM Unified Data Management, unified data management
  • the AMF network element requests the UDM service from the NRF network element.
  • the AMF network element sends to the NRF network element an initial UDM service request that does not carry information about the slice to which the network element belongs.
  • the NRF network element determines the initial UDM network element from the registered UDM network elements according to the UDM network element name. For example, it can search according to the UDM network element name, and determine the UDM network element corresponding to the first UDM information found as the initial UDM network element.
  • the NRF network element When the NRF network element finds the initial UDM network element, it returns the initial UDM information corresponding to the initial UDM network element to the AMF network element.
  • the initial UDM information may be service information owned by the initial UDM network element, and the service information may include information such as the IP address, port number, and service capability of the UDM.
  • the AMF network element After obtaining the initial UDM information, the AMF network element initiates a link establishment request to the initial UDM network element.
  • the initial UDM network element receives the link establishment request from the AMF, and replies to the AMF network element with a link establishment response, and the AMF network element establishes a link relationship with the initial UDM network element.
  • the user When the user goes online, the user sends online information including the user subscription permanent identifier to the AMF network element.
  • the subscription permanent identifier of the user may be a SUPI (Subscription Permanent Identifier) number.
  • the AMF network element After obtaining the subscription permanent identifier of the user, the AMF network element sends a user registration request to the initial UDM network element, wherein the user registration request includes SUPI.
  • the 5G core network user registration method may also include the following steps:
  • the initial UDM network element determines the target slice to which the user belongs according to the subscription permanent identifier in the user registration request; if the target slice is inconsistent with the slice to which the initial UDM network element belongs, the initial UDM network element rejects user registration.
  • the initial UDM network element when the initial UDM network element receives the user registration request sent by the AMF network element, it obtains the subscription permanent identifier from the user registration request, and judges the slice information to which the subscription permanent identifier belongs, and marks the slice as the user's target slice .
  • the initial UDM network element determines the slice information it belongs to, and judges whether it is consistent with the target slice. If not, the initial UDM network element rejects user registration. It can be understood that the UDM network element can obtain and store the user's subscription data including the subscription permanent identifier, and periodically send a service update message to the NRF network element, and report the slice information corresponding to the SUPI number.
  • Step 120 when the initial UDM network element rejects the user registration according to the user registration request, the AMF network element sends a UDM service request including the subscription permanent identifier to the NRF network element.
  • the initial UDM network element may return an error response to the AMF network element and reject the user registration.
  • the AMF network element receives the error response returned by the initial UDM network element, it can send the UDM service request including the subscription permanent identifier to the NRF network element.
  • Step 130 the NRF network element determines the target UDM network element from each UDM network element according to the UDM service request, and returns the target UDM information of the target UDM network element to the AMF network element, so as to realize the successful registration of the user.
  • the target UDM network element may be understood as a UDM network element that is consistent with the slice information to which the subscription permanent identifier of the user belongs.
  • the NRF network element can determine the target UDM network element consistent with the slice information to which the subscription permanent identifier belongs according to the subscription permanent identifier in the UDM service request sent by the AMF network element, and return the target UDM information of the target UDM network element to the The AMF network element, the AMF network element can establish a link relationship with the target UDM network element according to the target UDM information, so as to complete the user's Register operation.
  • step 130 may be implemented through the following specific steps:
  • the NRF network element determines the target slice to which the user belongs according to the subscription permanent identifier in the UDM service request, and determines the UDM network element whose slice is the target slice as the target UDM network element.
  • the NRF network element sends the target UDM information corresponding to the target UDM network element to the AMF network element.
  • the AMF network element sends a link establishment request to the target UDM network element, and the target UDM network element replies with a link establishment response to the AMF network element.
  • the AMF network element sends a user registration request to the target UDM network element, and the target UDM network element replies a registration success response to the AMF network element.
  • the NRF network element when the NRF network element receives the UDM service request sent by the AMF network element, it can obtain the subscription permanent identifier from the UDM service request, determine the target slice to which the user belongs according to the subscription permanent identifier, and set the slice to which the user belongs as the target slice.
  • the UDM network element is determined as the target UDM network element.
  • the NRF network element sends the target UDM information corresponding to the target UDM network element to the AMF network element.
  • the AMF network element After the AMF network element establishes a link relationship with the target UDM network element according to the target UDM information, it sends a user registration request to the target UDM network element, and the target UDM network element judges the slice to which the user belongs and its own The slices are consistent, and the target UDM network element replies a registration success response to the AMF network element, and the user successfully registers at this time.
  • FIG. 2 is a principle schematic diagram of a method for implementing error correction of 5G core network service interface slices provided by an embodiment of the present invention.
  • AMF shown in Figure 2 represents the AMF network element
  • NRF represents the NRF network element
  • UDM represents the initial UDM network element.
  • the initial UDM network element and the target UDM network element corresponding to the slice to which the user's SUPI number belongs are not the same UDM network element.
  • the main steps can include:
  • the initial UDM network element operates normally, and registers the service with the NRF network element
  • the AMF network element is running normally, and registers with the NRF network element for services;
  • the AMF network element sends the initial UDM service request UDM Service Request to the NRF network element;
  • the NRF network element determines the UDM network element corresponding to the first UDM information found as the initial UDM network element according to the network element name, loads the initial UDM information corresponding to the initial UDM network element into the UDM Service Response and returns it to the AMF network element ;
  • the AMF network element initiates a link establishment request Nnrf_discovery_req to the initial UDM network element;
  • the initial UDM network element replies to the AMF network element with a response Nnrf_discovery_rsp of successfully establishing a link, and the AMF network element establishes a link relationship with the initial UDM network element;
  • the AMF network element obtains the user's subscription permanent identifier SUPI number, and sends a User Register request (SUPI) including the SUPI number segment to the initial UDM network element;
  • SUPI User Register request
  • the initial UDM network element obtains the SUPI number from the user registration request, and judges the slice information to which the SUPI number belongs and its own The slice information to which the body belongs is inconsistent, and the initial UDM network element sends a user registration rejection response User Register response_Err to the AMF network element;
  • the AMF network element sends a UDM service request UDM Service Request (SUPI) including the SUPI number segment to the NRF network element;
  • SUPI UDM Service Request
  • the NRF network element determines the target UDM network element according to the UDM service request, loads the target UDM information of the target UDM network element into the UDM Service Response and returns it to the AMF network element;
  • the AMF network element When the AMF network element obtains the target UDM information, it can return to the steps similar to 5) to establish a link relationship with the target UDM network element and complete the user registration operation.
  • the technical solution of this embodiment is applied to the 5G core network.
  • the AMF network element in the 5G core network establishes a link relationship with the initial UDM network element corresponding to the initial UDM information according to the initial UDM information fed back by the NRF network element, and sends the link relationship to the initial UDM network element when the user goes online.
  • the initial UDM network element sends a user registration request, and the user registration request contains the user's subscription permanent identifier; when the initial UDM network element rejects the user registration according to the user registration request, the AMF network element sends a UDM service containing the subscription permanent identifier to the NRF network element request; the NRF network element determines the target UDM network element from each UDM network element according to the UDM service request, and returns the target UDM information of the target UDM network element to the AMF network element, so as to realize the successful registration of the user and solve the problem of the existing core network system
  • the problem of user online failure caused by ambiguous networking has realized the effect of automatically completing slice error correction under the premise of normal operation of the 5G core network to ensure normal online user access.
  • the 5G core network may further include at least one SMF network element.
  • the method provided by the embodiment of the present invention can also implement session creation between the user and the target SMF network element.
  • FIG. 3 is a flow chart of another implementation method for error correction of 5G core network service interface slicing provided by an embodiment of the present invention. On the basis of the foregoing embodiments, this embodiment further optimizes the implementation method for error correction of the service interface slice of the 5G core network.
  • the method specifically includes:
  • Step 210 the AMF network element sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information according to the initial SMF information fed back by the NRF network element, and the user session establishment request includes a subscription permanent identifier.
  • step 210 the method provided in this embodiment may further include the following steps:
  • Each SMF network element registers a service with the NRF network element respectively; the NRF network element determines the initial SMF network element from each SMF network element according to the name of the SMF network element.
  • the SMF Session Management Function, session management function
  • the NRF network element determines the initial SMF network element from each SMF network element according to the SMF network element name. For example, it can search according to the SMF network element name, and determine the SMF network element corresponding to the first SMF information found as the initial SMF network element. .
  • the NRF network element finds the initial SMF network element, it returns the initial SMF information corresponding to the initial SMF network element to the AMF network element.
  • the initial SMF information may be service information owned by the initial SMF network element, and the service information may include information such as the IP address, port number, and service capability of the SMF.
  • the session establishment process is initiated, and the request message of the user session establishment reaches the AMF network element through the base station.
  • the AMF network element receives the session request from the terminal user, and after obtaining the initial SMF information, initiates a user session establishment request to the initial SMF network element, wherein the user session establishment request may include the user's subscription permanent identifier.
  • Step 220 the initial SMF network element determines the target slice to which the user belongs according to the subscription permanent identifier in the user session establishment request, and when the target slice is inconsistent with the slice to which the initial SMF network element belongs, the initial SMF network element rejects the session establishment.
  • the initial SMF network element when the initial SMF network element receives the user session establishment request sent by the AMF network element, it obtains the subscription permanent identifier from the user session establishment request, and judges the slice information to which the subscription permanent identifier belongs, and records the slice as the user's target slice. The initial SMF network element determines the slice information it belongs to, and judges whether it is consistent with the target slice. If not, the initial SMF network element returns an error response to the AMF network element, and refuses session establishment.
  • Step 230 the AMF network element requests the SMF service from the NRF network element according to the subscription permanent identifier of the user, so as to establish a session between the user and the target SMF network element.
  • the target SMF network element can be understood as the SMF network element that is consistent with the slice information to which the subscription permanent identifier of the user belongs.
  • the initial SMF network element rejects session establishment, and the AMF network element receives an error response returned by the initial SMF network element, it may re-request the SMF service from the NRF network element according to the subscription permanent identifier.
  • step 230 may be implemented through the following specific steps:
  • the AMF network element sends an SMF service request including a subscription permanent identifier to the NRF network element.
  • the AMF network element loads the subscription permanent identifier of the user into the SMF service request and sends it to the NRF network element.
  • the NRF network element determines the target SMF network element from the SMF network elements according to the SMF service request, and returns the target SMF information of the target SMF network element to the AMF network element.
  • the NRF network element determines the target SMF network element from each SMF network element according to the SMF service request, which can be implemented in the following manner: the NRF network element determines the target slice to which the user belongs according to the subscription permanent identifier in the SMF service request, And determine the SMF network element whose slice is the target slice as the target SMF network element.
  • the NRF network element may obtain the subscription permanent identifier from the SMF service request sent by the AMF network element, determine the slice information to which the subscription permanent identifier belongs, and record the slice as the user's target slice.
  • the NRF network element can determine the SMF network element whose slice is the target slice as the target SMF network element, and return the target SMF information of the target SMF network element to the AMF network Yuan.
  • the AMF network element creates a session between the user and the target SMF network element according to the target SMF information.
  • the AMF network element can send a user session establishment request to the target SMF network element according to the target SMF information, and the target SMF network element judges that the slice to which the user belongs is consistent with the slice to which it belongs according to the subscription permanent identifier in the user session establishment request, and the target SMF network element The network element replies a session creation success response to the AMF network element, and at this time, the user session is created.
  • FIG. 4 is a schematic schematic diagram of another implementation method for error correction of 5G core network service interface slices provided by an embodiment of the present invention.
  • AMF shown in Figure 4 represents the AMF network element
  • NRF represents the NRF network element
  • UDM represents the target UDM network element that is consistent with the slice to which the SUPI number of the user belongs
  • SMF represents the initial SMF network element.
  • the initial SMF network element and the user The target SMF network element corresponding to the slice to which the SUPI number belongs is not the same SMF network element, the main steps may include:
  • the target UDM network element is running normally, and registers with the NRF network element for services;
  • the AMF network element is running normally, and registers with the NRF network element for services;
  • the initial UDM network element operates normally, and registers the service with the NRF network element
  • the AMF network element requests UDM information from the NRF network element, and successfully completes the user registration process
  • the AMF network element sends a user session establishment request PDU Session Establishment Request to the initial SMF network element;
  • the initial SMF network element obtains the SUPI number from the user session establishment request, and judges that the slice information to which the SUPI number belongs is inconsistent with the slice information to which it belongs, and the initial SMF network element sends a session establishment rejection PDU Session Establishment Response_Err to the AMF network element;
  • the AMF network element sends the SMF service request SMF Service Request (SUPI) including the SUPI number segment to the NRF network element;
  • SUPI SMF Service Request
  • the NRF network element determines the target SMF network element according to the SMF service request, loads the target SMF information of the target SMF network element into the SMF Service Response and returns it to the AMF network element;
  • the AMF network element When the AMF network element obtains the target SMF information, it can return to the steps similar to 5) and send a user session establishment request to the target SMF network element to complete the user session creation operation.
  • the technical solution of this embodiment is applied to the 5G core network.
  • the AMF network element in the 5G core network sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information according to the initial SMF information fed back by the NRF network element.
  • the user session establishment request includes Subscribe to the permanent identifier; the initial SMF network element determines the target slice to which the user belongs according to the subscription permanent identifier in the user session establishment request.
  • the initial SMF network element rejects the session establishment; AMF According to the user's subscription permanent identifier, the network element requests the SMF service from the NRF network element to realize the session creation between the user and the target SMF network element, which solves the problem of the user's online failure caused by the fuzzy networking of the existing core network system, and realizes Under the premise of the normal operation of the 5G core network, the error correction of slices is automatically completed to ensure that users can go online normally and create sessions.

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Abstract

本发明公开了一种5G核心网服务化接口切片纠错的实现方法。该方法应用于5G核心网，5G核心网包含但不限于AMF网元、NRF网元和至少一个UDM网元。该方法包括：AMF网元根据NRF网元反馈的初始UDM信息，与初始UDM信息对应的初始UDM网元建立链路关系，并在用户上线时向初始UDM网元发送用户注册请求，用户注册请求包含用户的订阅永久标识符；当初始UDM网元根据用户注册请求拒绝用户注册时，AMF网元向NRF网元发送包含订阅永久标识符的UDM服务请求；NRF网元根据UDM服务请求从各UDM网元中确定目标UDM网元，并将目标UDM网元的目标UDM信息返回至AMF网元，以实现用户成功注册。本发明可在系统正常运行的前提下，完成切片纠错，实现用户正常上线。

Description

一种5G核心网服务化接口切片纠错的实现方法 技术领域
本发明实施例涉及5G核心网技术领域，尤其涉及一种5G核心网服务化接口切片纠错的实现方法。
背景技术
5GC(5G Core Network，5G核心网)的服务化接口功能主要是以NRF(Network Repository Function，网络仓储功能)为核心，NRF网元支持服务发现功能，将发现的NF实例信息提供给请求发现服务的NF实例。目前，NRF在有切片网元和无切片网元的核心网组网场景中，无法保证选择正确的NF实例信息。
发明内容
本发明提供一种5G核心网服务化接口切片纠错的实现方法，以实现在5GC系统正常运行的前提下，完成切片纠错，保证用户正常上线。
本发明实施例提供了一种5G核心网用户注册方法，包括：
AMF网元根据NRF网元反馈的初始UDM信息，与所述初始UDM信息对应的初始UDM网元建立链路关系，并在用户上线时向所述初始UDM网元发送用户注册请求，其中，所述用户注册请求包含所述用户的订阅永久标识符；
当所述初始UDM网元根据所述用户注册请求拒绝用户注册时，所述AMF网元向所述NRF网元发送包含所述订阅永久标识符的UDM服务请求；
所述NRF网元根据所述UDM服务请求从各所述UDM网元中确定目标UDM网元，并将所述目标UDM网元的目标UDM信息返回至所述AMF网元，以实现所述用户成功注册。
可选的，在AMF网元根据NRF网元反馈的初始UDM信息，与所述初始UDM信息对应的初始UDM网元建立链路关系之前，还包括：
所述AMF网元向所述NRF网元发送初始UDM服务请求，所述NRF网元根据UDM网元名称从各所述UDM网元中确定所述初始UDM网元。
可选的，在所述AMF网元向所述NRF网元发送初始UDM服务请求，所述NRF网元根据UDM网元名称从各所述UDM网元中确定所述初始UDM网元之前，还包括：
所述AMF网元向所述NRF网元注册服务；
各所述UDM网元分别向所述NRF网元注册服务。
可选的，所述初始UDM网元根据所述用户注册请求拒绝用户注册，包括：
所述初始UDM网元根据所述用户注册请求中的订阅永久标识符，确定所述用户归属的目标切片；
若所述目标切片与所述初始UDM网元所属切片不一致，则所述初始UDM网元拒绝用户注册。
可选的，所述NRF网元根据所述UDM服务请求从各所述UDM网元中确定目标UDM网元，并将所述目标UDM网元的目标UDM信息返回至所述AMF网元，以实现所述用户成功注册，包括：
所述NRF网元根据所述UDM服务请求中的订阅永久标识符，确定所述用户归属的目标切片，将所属切片为所述目标切片的UDM网元确定为目标UDM网元；
所述NRF网元将所述目标UDM网元对应的目标UDM信息发送至所述AMF网元；
所述AMF网元根据所述目标UDM信息向所述目标UDM网元发送建立链路请求，所述目标UDM网元向所述AMF网元回复建立链路应答；
所述AMF网元向所述目标UDM网元发送用户注册请求，所述目标UDM网元向所述AMF网元回复注册成功应答。
可选的，所述5G核心网还包括至少一个SMF网元；
相应的，在实现所述用户成功注册之后，还包括：
所述AMF网元根据所述用户的订阅永久标识符，向所述NRF网元请求SMF服务，以实现所述用户与目标SMF网元的会话创建。
可选的，在所述AMF网元根据所述用户的订阅永久标识符，向所述NRF网元请求SMF服务之前，还包括：
所述AMF网元根据所述NRF网元反馈的初始SMF信息，向所述初始SMF信息对应的初始SMF网元发送用户会话建立请求，所述用户会话建立请求包含所述订阅永久标识符；
所述初始SMF网元根据所述用户会话建立请求中的订阅永久标识符，确定所述用户归属的目标切片；
当所述目标切片与所述初始SMF网元所属切片不一致时，所述初始SMF网元拒绝会话建立。
可选的，在所述AMF网元根据所述NRF网元反馈的初始SMF信息，向所述初始SMF信息对应的初始SMF网元发送用户会话建立请求之前，还包括：
各所述SMF网元分别向所述NRF网元注册服务；
所述NRF网元根据SMF网元名称从各所述SMF网元中确定所述初始SMF网元。
可选的，所述AMF网元根据所述用户的订阅永久标识符，向所述NRF网元请求SMF服务，以实现所述用户与目标SMF网元的会话创建，包括：
所述NRF网元查找到的初始SMF网元与所述AMF网元创建会话失败时，所述AMF网元向所述NRF网元发送包含所述订阅永久标识符的SMF服务请求；
所述NRF网元根据所述SMF服务请求从各所述SMF网元中确定目标SMF网元，将所述目标SMF网元的目标SMF信息返回至所述AMF网元；
所述AMF网元根据所述目标SMF信息实现所述用户与所述目标SMF网元的会话创建。
可选的，所述NRF网元根据所述SMF服务请求从各所述SMF网元中确定目标SMF网元，包括：
所述NRF网元根据所述SMF服务请求中的订阅永久标识符，确定所述用户归属的目标切片，并将所属切片为所述目标切片的SMF网元确定为目标SMF网元。
本发明5G核心网中AMF网元根据NRF网元反馈的初始UDM信息，与初始UDM信息对应的初始UDM网元建立链路关系，并在用户上线时向初始UDM网元发送用户注册请求，用户注册请求包含用户的订阅永久标识符；当初始UDM网元根据用户注册请求拒绝用户注册时，AMF网元向NRF网元发送包含订阅永久标识符的UDM服务请求；NRF网元根据UDM服务请求从各UDM网元中确定目标UDM网元，并将目标UDM网元的目标UDM信息返回至AMF网元，以实现用户成功注册，解决了现有核心网系统组网模糊导致的用户上线失败的问题，实现了在5G核心网正常运行的前提下，自动完成切片纠错，保证用户正常上线的效果。
附图说明
图1是本发明实施例提供的一种5G核心网服务化接口切片纠错的实现方法的流程图；
图2是本发明实施例提供的一种5G核心网服务化接口切片纠错的实现方法的原理示意图；
图3是本发明实施例提供的另一种5G核心网用户服务化接口切片纠错的实现方法的流程图；
图4是本发明实施例提供的另一种5G核心网用户服务化接口切片纠错的实现方法的原理示意图。
具体实施方式
下面结合附图和实施例对本发明作进一步的详细说明。可以理解的是，此处所描述的具 体实施例仅仅用于解释本发明，而非对本发明的限定。另外还需要说明的是，为了便于描述，附图中仅示出了与本发明相关的部分而非全部结构，此外，在不冲突的情况下，本发明中的实施例及实施例中的特征可以相互组合。
在一般场景中，NRF在有切片网元和无切片网元的核心网组网场景中，无法确保选择了正确的NF实例信息，导致系统模糊组网，那么在用户上线时，常出现用户上线失败的问题，系统弹性容错能力很弱。本发明提供了一种解决核心网系统组网模糊导致的用户上线失败的问题的方法。
实施例一
图1为本发明实施例提供的一种5G核心网服务化接口切片纠错的实现方法的流程图，本实施例可适用于5G核心网用户注册的情况，该方法可以应用于5G核心网，5G核心网可以包含AMF网元、NRF网元和至少一个UDM网元，各网元可以通过软件和/或硬件实现。
如图1所示，该方法具体包括如下步骤：
步骤110、AMF网元根据NRF网元反馈的初始UDM信息，与初始UDM信息对应的初始UDM网元建立链路关系，并在用户上线时向初始UDM网元发送用户注册请求，其中，用户注册请求包含用户的订阅永久标识符。
可选的，在步骤110之前，本实施例提供的5G核心网服务化接口切片纠错的实现方法还可以包括以下步骤：
AMF网元向NRF网元发送初始UDM服务请求，NRF网元根据UDM网元名称从各UDM网元中确定初始UDM网元。
进一步的，在AMF网元向NRF网元发送初始UDM服务请求，NRF网元根据UDM网元名称从各UDM网元中确定初始UDM网元之前，本实施例提供的5G核心网服务化接口切片纠错的实现方法还可以包括以下步骤：
AMF网元向NRF网元注册服务；各UDM网元分别向NRF网元注册服务。
具体的，AMF(Access and Mobility Management Function，接入和移动管理功能)网元正常运行，向NRF(Network Repository Function，网络仓储功能)网元注册服务。UDM(Unified Data Management，统一数据管理)网元正常运行，向NRF网元注册服务。AMF网元向NRF网元请求UDM服务，此时AMF网元向NRF网元发送没有携带本网元归属切片信息的初始UDM服务请求。NRF网元根据UDM网元名称从已注册服务的UDM网元中确定初始UDM网元，例如可以根据UDM网元名称进行查找，将查到的第一个UDM信息对应的UDM网元确定为初始UDM网元。
NRF网元查找到初始UDM网元时，将初始UDM网元对应的初始UDM信息返回给AMF网元。初始UDM信息可以为初始UDM网元所有的服务信息，服务信息可以包括UDM的IP地址，端口号和服务能力等信息。AMF网元获得初始UDM信息后，向初始UDM网元发起建立链路请求。初始UDM网元接收到AMF的建立链路请求，向AMF网元回复成功建立链路的应答，AMF网元与初始UDM网元建立链路关系。
当用户上线时，用户向AMF网元发送包含用户订阅永久标识符的上线信息。在本实施例中，用户的订阅永久标识符可以是SUPI(Subscription Permanent Identifier)号码。AMF网元获取到用户的订阅永久标识符后向初始UDM网元发送用户注册请求，其中，用户注册请求包含SUPI。
可选的，在AMF网元向初始UDM网元发送用户注册请求之后，本实施例提供的5G核心网用户注册方法还可以包括以下步骤：
初始UDM网元根据用户注册请求中的订阅永久标识符，确定用户归属的目标切片；若目标切片与初始UDM网元所属切片不一致，则初始UDM网元拒绝用户注册。
具体的，当初始UDM网元接收到AMF网元发送的用户注册请求，从用户注册请求中获取订阅永久标识符，并判断订阅永久标识符归属的切片信息，将该切片标记为用户的目标切片。初始UDM网元确定自身归属的切片信息，判断与目标切片是否一致，若不一致，则初始UDM网元拒绝用户注册。可以理解的是，UDM网元可以获取和存储用户包含订阅永久标识符的签约数据，并周期性的向NRF网元发起服务更新消息，上报SUPI号码对应的切片信息。
步骤120、当初始UDM网元根据用户注册请求拒绝用户注册时，AMF网元向NRF网元发送包含订阅永久标识符的UDM服务请求。
具体的，当初始UDM网元根据用户注册请求中的订阅永久标识符判断用户所属的切片与自身所属切片不一致时，初始UDM网元可以返回错误应答给AMF网元，拒绝用户注册。AMF网元接收到初始UDM网元返回的错误应答时，可以将包含订阅永久标识符的UDM服务请求发送给NRF网元。
步骤130、NRF网元根据UDM服务请求从各UDM网元中确定目标UDM网元，并将目标UDM网元的目标UDM信息返回至AMF网元，以实现用户成功注册。
其中，目标UDM网元可以理解为与用户的订阅永久标识符所属切片信息一致的UDM网元。
具体的，NRF网元可以根据AMF网元发送的UDM服务请求中的订阅永久标识符，确定与订阅永久标识符所属切片信息一致的目标UDM网元，将目标UDM网元的目标UDM信息返回至AMF网元，AMF网元就可以根据目标UDM信息与目标UDM网元建立链路关系，以完成用户的 注册操作。
可选的，步骤130可以通过以下具体步骤实现：
S1301、NRF网元根据UDM服务请求中的订阅永久标识符，确定用户归属的目标切片，将所属切片为目标切片的UDM网元确定为目标UDM网元。
S1302、NRF网元将目标UDM网元对应的目标UDM信息发送至AMF网元。
S1303、AMF网元向目标UDM网元发送建立链路请求，目标UDM网元向AMF网元回复建立链路应答。
S1304、AMF网元向目标UDM网元发送用户注册请求，目标UDM网元向AMF网元回复注册成功应答。
具体的，NRF网元接收到AMF网元发送的UDM服务请求时，可以从UDM服务请求中获取订阅永久标识符，根据订阅永久标识符确定用户归属的目标切片，并将所属切片为目标切片的UDM网元确定为目标UDM网元。NRF网元将目标UDM网元对应的目标UDM信息发送至AMF网元。AMF网元根据目标UDM信息与目标UDM网元建立链路关系之后，向目标UDM网元发送用户注册请求，目标UDM网元根据用户注册请求中的订阅永久标识符判断用户所属的切片与自身所属切片一致，目标UDM网元向AMF网元回复注册成功应答，此时用户成功注册。
示例性的，图2是本发明实施例提供的一种5G核心网服务化接口切片纠错的实现方法的原理示意图。图2所示的AMF代表AMF网元，NRF代表NRF网元，UDM代表初始UDM网元，本示例中的初始UDM网元与用户的SUPI号码所属切片对应的目标UDM网元不是同一UDM网元，主要步骤可以包括：
1)初始UDM网元正常运行，向NRF网元注册服务；
2)AMF网元正常运行，向NRF网元注册服务；
3)AMF网元向NRF网元发送初始UDM服务请求UDM Service Request；
4)NRF网元根据网元名称将查到的第一个UDM信息对应的UDM网元确定为初始UDM网元，将初始UDM网元对应的初始UDM信息载入UDM Service Response返回给AMF网元；
5)AMF网元向初始UDM网元发起建立链路请求Nnrf_discovery_req；
6)初始UDM网元向AMF网元回复成功建立链路的应答Nnrf_discovery_rsp，AMF网元与初始UDM网元建立链路关系；
7)当用户上线时，AMF网元获取用户的订阅永久标识符SUPI号码，将向初始UDM网元发送包含SUPI号码段的用户注册请求User Register request(SUPI)；
8)初始UDM网元从用户注册请求中获取SUPI号码，判断SUPI号码所属切片信息与自 身所属切片信息不一致，初始UDM网元给AMF网元发送拒绝用户注册应答User Register response_Err；
9)AMF网元向NRF网元发送包含SUPI号码段的UDM服务请求UDM Service Request(SUPI)；
10)NRF网元根据UDM服务请求确定目标UDM网元，将目标UDM网元的目标UDM信息载入UDM Service Response返回至AMF网元；
11)AMF网元获取到目标UDM信息时，可以返回执行类似5)的步骤，与目标UDM网元建立链路关系，并完成用户的注册操作。
本实施例的技术方案应用于5G核心网，5G核心网中AMF网元根据NRF网元反馈的初始UDM信息，与初始UDM信息对应的初始UDM网元建立链路关系，并在用户上线时向初始UDM网元发送用户注册请求，用户注册请求包含用户的订阅永久标识符；当初始UDM网元根据用户注册请求拒绝用户注册时，AMF网元向NRF网元发送包含订阅永久标识符的UDM服务请求；NRF网元根据UDM服务请求从各UDM网元中确定目标UDM网元，并将目标UDM网元的目标UDM信息返回至AMF网元，以实现用户成功注册，解决了现有核心网系统组网模糊导致的用户上线失败的问题，实现了在5G核心网正常运行的前提下，自动完成切片纠错，保证用户正常上线的效果。
在上述技术方案的基础上，5G核心网还可以包括至少一个SMF网元。相应的的，本发明实施例提供的方法还可以实现用户与目标SMF网元的会话创建。
图3为本发明实施例提供的另一种5G核心网服务化接口切片纠错的实现方法的流程图。本实施例在上述实施例的基础上，进一步优化了上述5G核心网服务化接口切片纠错的实现方法。
如图3所示，该方法具体包括：
步骤210、AMF网元根据NRF网元反馈的初始SMF信息，向初始SMF信息对应的初始SMF网元发送用户会话建立请求，用户会话建立请求包含订阅永久标识符。
可选的，在步骤210之前，本实施例提供的方法还可以包括以下步骤：
各SMF网元分别向NRF网元注册服务；NRF网元根据SMF网元名称从各SMF网元中确定初始SMF网元。
具体的，SMF(Session Management Function，会话管理功能)网元正常运行，向NRF网元注册服务。NRF网元根据SMF网元名称从各SMF网元中确定初始SMF网元，例如可以根据SMF网元名称进行查找，将查到的第一个SMF信息对应的SMF网元确定为初始SMF网元。 NRF网元查找到初始SMF网元时，将初始SMF网元对应的初始SMF信息返回给AMF网元。初始SMF信息可以为初始SMF网元所有的服务信息，服务信息可以包括SMF的IP地址，端口号和服务能力等信息。
用户成功注册后，发起会话建立流程，用户会话建立的请求消息经过基站达到AMF网元。AMF网元收到终端用户的会话请求，获得初始SMF信息后，向初始SMF网元发起用户会话建立请求，其中，用户会话建立请求可以包含用户的订阅永久标识符。
步骤220、初始SMF网元根据用户会话建立请求中的订阅永久标识符，确定用户归属的目标切片，当目标切片与初始SMF网元所属切片不一致时，初始SMF网元拒绝会话建立。
具体的，当初始SMF网元接收到AMF网元发送的用户会话建立请求，从用户会话建立请求中获取订阅永久标识符，并判断订阅永久标识符归属的切片信息，将该切片记为用户的目标切片。初始SMF网元确定自身归属的切片信息，判断与目标切片是否一致，若不一致，则初始SMF网元返回错误应答给AMF网元，拒绝会话建立。
步骤230、AMF网元根据用户的订阅永久标识符，向NRF网元请求SMF服务，以实现用户与目标SMF网元的会话创建。
其中，目标SMF网元可以理解为与用户的订阅永久标识符所属切片信息一致的SMF网元。
具体的，当初始SMF网元拒绝会话建立，AMF网元接收到初始SMF网元返回的错误应答时，可以根据订阅永久标识符重新向NRF网元请求SMF服务。
可选的，步骤230可以通过以下具体步骤实现：
S2301、NRF网元查找到的初始SMF网元与AMF网元创建会话失败时，AMF网元向NRF网元发送包含订阅永久标识符的SMF服务请求。
具体的，当初始SMF网元返回错误应答给AMF网元，拒绝会话建立时，AMF网元将用户的订阅永久标识符载入SMF服务请求中，发送至NRF网元。
S2302、NRF网元根据SMF服务请求从各SMF网元中确定目标SMF网元，将目标SMF网元的目标SMF信息返回至AMF网元。
进一步的，NRF网元根据SMF服务请求从各SMF网元中确定目标SMF网元，可以通过以下方式具体实现：NRF网元根据SMF服务请求中的订阅永久标识符，确定用户归属的目标切片，并将所属切片为目标切片的SMF网元确定为目标SMF网元。
具体的，NRF网元可以从AMF网元发送的SMF服务请求中获取订阅永久标识符，判断订阅永久标识符归属的切片信息，将该切片记为用户的目标切片。NRF网元可以将所属切片为目标切片的SMF网元确定为目标SMF网元，并将目标SMF网元的目标SMF信息返回至AMF网 元。
S2303、AMF网元根据目标SMF信息实现用户与目标SMF网元的会话创建。
具体的，AMF网元可以根据目标SMF信息向目标SMF网元发送用户会话建立请求，目标SMF网元根据用户会话建立请求中的订阅永久标识符判断用户所属的切片与自身所属切片一致，目标SMF网元向AMF网元回复会话创建成功应答，此时用户会话创建完成。
示例性的，图4是本发明实施例提供的另一种5G核心网服务化接口切片纠错的实现方法的原理示意图。图4所示的AMF代表AMF网元，NRF代表NRF网元，UDM代表与用户的SUPI号码所属切片一致的目标UDM网元，SMF代表初始SMF网元，本示例中的初始SMF网元与用户的SUPI号码所属切片对应的目标SMF网元不是同一SMF网元，主要步骤可以包括：
1)目标UDM网元正常运行，向NRF网元注册服务；
2)AMF网元正常运行，向NRF网元注册服务；
3)初始UDM网元正常运行，向NRF网元注册服务；
4)AMF网元向NRF网元请求UDM信息，成功完成用户注册流程；
5)AMF网元向初始SMF网元发送用户会话建立请求PDU Session Establishment Request；
6)初始SMF网元从用户会话建立请求中获取SUPI号码，判断SUPI号码所属切片信息与自身所属切片信息不一致，初始SMF网元给AMF网元发送拒绝会话建立应答PDU Session Establishment Response_Err；
7)AMF网元向NRF网元发送包含SUPI号码段的SMF服务请求SMF Service Request(SUPI)；
8)NRF网元根据SMF服务请求确定目标SMF网元，将目标SMF网元的目标SMF信息载入SMF Service Response返回至AMF网元；
9)AMF网元获取到目标SMF信息时，可以返回执行类似5)的步骤，向目标SMF网元发送用户会话建立请求，以完成用户的会话创建操作。
本实施例的技术方案应用于5G核心网，5G核心网中AMF网元根据NRF网元反馈的初始SMF信息，向初始SMF信息对应的初始SMF网元发送用户会话建立请求，用户会话建立请求包含订阅永久标识符；初始SMF网元根据用户会话建立请求中的订阅永久标识符，确定用户归属的目标切片，当目标切片与初始SMF网元所属切片不一致时，初始SMF网元拒绝会话建立；AMF网元根据用户的订阅永久标识符，向NRF网元请求SMF服务，以实现用户与目标SMF网元的会话创建，解决了现有核心网系统组网模糊导致的用户上线失败的问题，实现了在5G核心网正常运行的前提下，自动完成切片纠错，保证用户正常上线并创建会话的效果。
值得注意的是，上述实施例中，所包括的各个单元和模块只是按照功能逻辑进行划分的， 但并不局限于上述的划分，只要能够实现相应的功能即可；另外，各功能单元的具体名称也只是为了便于相互区分，并不用于限制本发明的保护范围。
注意，上述仅为本发明的较佳实施例及所运用技术原理。本领域技术人员会理解，本发明不限于这里所述的特定实施例，对本领域技术人员来说能够进行各种明显的变化、重新调整和替代而不会脱离本发明的保护范围。因此，虽然通过以上实施例对本发明进行了较为详细的说明，但是本发明不仅仅限于以上实施例，在不脱离本发明构思的情况下，还可以包括更多其他等效实施例，而本发明的范围由所附的权利要求范围决定。

Claims (10)

  1. 一种5G核心网服务化接口切片纠错的实现方法，应用于5G核心网，所述5G核心网包含AMF网元、NRF网元和至少一个UDM网元，其特征在于，包括：
    AMF网元根据NRF网元反馈的初始UDM信息，与所述初始UDM信息对应的初始UDM网元建立链路关系，并在用户上线时向所述初始UDM网元发送用户注册请求，其中，所述用户注册请求包含所述用户的订阅永久标识符；
    当所述初始UDM网元根据所述用户注册请求拒绝用户注册时，所述AMF网元向所述NRF网元发送包含所述订阅永久标识符的UDM服务请求；
    所述NRF网元根据所述UDM服务请求从各所述UDM网元中确定目标UDM网元，并将所述目标UDM网元的目标UDM信息返回至所述AMF网元，以实现所述用户成功注册。
  2. 根据权利要求1所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，在AMF网元根据NRF网元反馈的初始UDM信息，与所述初始UDM信息对应的初始UDM网元建立链路关系之前，还包括：
    所述AMF网元向所述NRF网元发送初始UDM服务请求，所述NRF网元根据UDM网元名称从各所述UDM网元中确定所述初始UDM网元。
  3. 根据权利要求2所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，在所述AMF网元向所述NRF网元发送初始UDM服务请求，所述NRF网元根据UDM网元名称从各所述UDM网元中确定所述初始UDM网元之前，还包括：
    所述AMF网元向所述NRF网元注册服务；
    各所述UDM网元分别向所述NRF网元注册服务。
  4. 根据权利要求1所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，所述初始UDM网元根据所述用户注册请求拒绝用户注册，包括：
    所述初始UDM网元根据所述用户注册请求中的订阅永久标识符，确定所述用户归属的目标切片；
    若所述目标切片与所述初始UDM网元所属切片不一致，则所述初始UDM网元拒绝用户注册。
  5. 根据权利要求1所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，所述NRF网元根据所述UDM服务请求从各所述UDM网元中确定目标UDM网元，并将所述目标UDM网元的目标UDM信息返回至所述AMF网元，以实现所述用户成功注册，包括：
    所述NRF网元根据所述UDM服务请求中的订阅永久标识符，确定所述用户归属的目标切片，将所属切片为所述目标切片的UDM网元确定为目标UDM网元；
    所述NRF网元将所述目标UDM网元对应的目标UDM信息发送至所述AMF网元；
    所述AMF网元根据所述目标UDM信息向所述目标UDM网元发送建立链路请求，所述目标UDM网元向所述AMF网元回复建立链路应答；
    所述AMF网元向所述目标UDM网元发送用户注册请求，所述目标UDM网元向所述AMF网元回复注册成功应答。
  6. 权利要求1所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，所述5G核心网还包括至少一个SMF网元；
    相应的，在实现所述用户成功注册之后，还包括：
    所述AMF网元根据所述用户的订阅永久标识符，向所述NRF网元请求SMF服务，以实现所述用户与目标SMF网元的会话创建。
  7. 根据权利要求6所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，在所述AMF网元根据所述用户的订阅永久标识符，向所述NRF网元请求SMF服务之前，还包括：
    所述AMF网元根据所述NRF网元反馈的初始SMF信息，向所述初始SMF信息对应的初始SMF网元发送用户会话建立请求，所述用户会话建立请求包含所述订阅永久标识符；
    所述初始SMF网元根据所述用户会话建立请求中的订阅永久标识符，确定所述用户归属的目标切片；
    当所述目标切片与所述初始SMF网元所属切片不一致时，所述初始SMF网元拒绝会话建立。
  8. 根据权利要求7所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，在所述AMF网元根据所述NRF网元反馈的初始SMF信息，向所述初始SMF信息对应的初始SMF网元发送用户会话建立请求之前，还包括：
    各所述SMF网元分别向所述NRF网元注册服务；
    所述NRF网元根据SMF网元名称从各所述SMF网元中确定所述初始SMF网元。
  9. 根据权利要求6所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，所述AMF网元根据所述用户的订阅永久标识符，向所述NRF网元请求SMF服务，以实现所述用户与目标SMF网元的会话创建，包括：
    所述NRF网元查找到的初始SMF网元与所述AMF网元创建会话失败时，所述AMF网元向所述NRF网元发送包含所述订阅永久标识符的SMF服务请求；
    所述NRF网元根据所述SMF服务请求从各所述SMF网元中确定目标SMF网元，将所述目标SMF网元的目标SMF信息返回至所述AMF网元；
    所述AMF网元根据所述目标SMF信息实现所述用户与所述目标SMF网元的会话创建。
  10. 根据权利要求9所述的5G核心网服务化接口切片纠错的实现方法，其特征在于，所述NRF网元根据所述SMF服务请求从各所述SMF网元中确定目标SMF网元，包括：
    所述NRF网元根据所述SMF服务请求中的订阅永久标识符，确定所述用户归属的目标切片，并将所属切片为所述目标切片的SMF网元确定为目标SMF网元。
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