Implementation method of 5G core network service interface slice error correction

Abstract

The application discloses a kind of 5G core network service interface slice error correction implementation methods.The method is applied to 5G core network, 5G core network includes but is not limited to AMF network element, NRF network element and at least one UDM network element.The method comprises: AMF network element establishes link relationship according to the initial UDM information fed back by NRF network element, and initial UDM network element corresponding to initial UDM information, and sends user registration request to initial UDM network element when user is online, and user registration request includes the subscription permanent identifier of user;When initial UDM network element rejects user registration according to user registration request, AMF network element sends UDM service request including subscription permanent identifier to NRF network element;NRF network element determines target UDM network element from each UDM network element according to UDM service request, and returns target UDM information of target UDM network element to AMF network element, to realize user successful registration.The application can complete slice error correction under the premise that system is normally operated, realizes that user is normally online.

Description

Technical Field

[0001] This invention relates to the field of 5G core network technology, and in particular to a method for implementing error correction of 5G core network service interface slices. Background Technology

[0002] The service-oriented interface functions of 5GC (5G Core Network) are primarily based on NRF (Network Repository Function). NRF network elements support service discovery, providing discovered NF instance information to the NF instances requesting the discovery service. Currently, in core network scenarios with and without sliced ​​network elements, NRF cannot guarantee the selection of correct NF instance information, leading to ambiguous network topology and frequent user login failures, resulting in weak system resilience and fault tolerance. Summary of the Invention

[0003] This invention provides a method for implementing error correction of 5G core network service interface slices, so as to complete slice error correction under the premise that the 5GC system is running normally and ensure that users can go online normally.

[0004] This invention provides a 5G core network user registration method, including:

[0005] The AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information based on 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. The user registration request contains the user's subscription permanent identifier.

[0006] When the initial UDM network element rejects the user registration based on the user registration request, the AMF network element sends a UDM service request containing the subscription permanent identifier to the NRF network element;

[0007] The NRF network element determines the target UDM network element from among 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 to achieve successful user registration.

[0008] Optionally, before the AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information based on the initial UDM information fed back by the NRF network element, the method further includes:

[0009] 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 of the UDM network elements according to the UDM network element name.

[0010] Optionally, before 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 based on the UDM network element name, the method further includes:

[0011] The AMF network element registers services with the NRF network element;

[0012] Each of the UDM network elements registers its services with the NRF network element.

[0013] Optionally, the initial UDM network element may reject user registration based on the user registration request, including:

[0014] The initial UDM network element determines the target slice to which the user belongs based on the subscription permanent identifier in the user registration request;

[0015] If the target slice is inconsistent with the slice to which the initial UDM network element belongs, the initial UDM network element will refuse user registration.

[0016] Optionally, the NRF network element determines the target UDM network element from among 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 to achieve successful user registration, including:

[0017] The NRF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the UDM service request, and identifies the UDM network element whose slice is the target slice as the target UDM network element.

[0018] The NRF network element sends the target UDM information corresponding to the target UDM network element to the AMF network element;

[0019] The AMF network element sends a link establishment request to the target UDM network element based on the target UDM information, and the target UDM network element replies with a link establishment response to the AMF network element;

[0020] The AMF network element sends a user registration request to the target UDM network element, and the target UDM network element replies to the AMF network element with a registration success response.

[0021] Optionally, the 5G core network also includes at least one SMF network element;

[0022] Accordingly, after successful user registration, the process also includes:

[0023] The AMF network element requests SMF services from the NRF network element based on the user's subscription permanent identifier, so as to realize the creation of a session between the user and the target SMF network element.

[0024] Optionally, before the AMF network element requests SMF services from the NRF network element based on the user's subscription permanent identifier, the method further includes:

[0025] The AMF network element sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information based on the initial SMF information fed back by the NRF network element. The user session establishment request includes the subscription permanent identifier.

[0026] The initial SMF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the user session establishment request;

[0027] When the target slice is inconsistent with the slice to which the initial SMF network element belongs, the initial SMF network element refuses to establish a session.

[0028] Optionally, before the AMF network element sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information based on the initial SMF information fed back by the NRF network element, the method further includes:

[0029] Each of the SMF network elements registers its services with the NRF network element.

[0030] The NRF network element determines the initial SMF network element from each of the SMF network elements based on the SMF network element name.

[0031] Optionally, the AMF network element requests SMF services from the NRF network element based on the user's subscription permanent identifier to establish a session between the user and the target SMF network element, including:

[0032] When the initial SMF network element found by the NRF network element fails to create a session with the AMF network element, the AMF network element sends an SMF service request containing the subscription permanent identifier to the NRF network element.

[0033] The NRF network element determines the target SMF network element from each SMF network element according to the SMF service request, and returns the target SMF information of the target SMF network element to the AMF network element.

[0034] The AMF network element establishes a session between the user and the target SMF network element based on the target SMF information.

[0035] Optionally, the NRF network element determines the target SMF network element from among the SMF network elements according to the SMF service request, including:

[0036] The NRF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the SMF service request, and identifies the SMF network element whose slice is the target slice as the target SMF network element.

[0037] In this invention, 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 fed back by the NRF network element, and sends a user registration request to the initial UDM network element when the user goes online. The user registration request contains the user's subscription permanent identifier. When the initial UDM network element rejects the user registration based on the user registration request, the AMF network element sends a UDM service request containing the subscription permanent identifier to the NRF network element. The NRF network element determines the target UDM network element from among the various UDM network elements based on the UDM service request, and returns the target UDM information of the target UDM network element to the AMF network element to achieve successful user registration. This solves the problem of user online failure caused by network ambiguity in the existing core network system, and achieves the effect of automatically completing slice error correction and ensuring normal user online performance under the premise of normal operation of the 5G core network. Attached Figure Description

[0038] Figure 1 This is a flowchart of a method for implementing error correction of 5G core network service-oriented interface slices provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram illustrating the principle of a method for implementing error correction of 5G core network service-oriented interface slices provided in an embodiment of the present invention;

[0040] Figure 3 This is a flowchart of another method for implementing error correction of 5G core network user service interface slices provided in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram illustrating the principle of another method for implementing error correction of 5G core network user service interface slices provided in an embodiment of the present invention. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the drawings, not all structures. Moreover, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0043] Example 1

[0044] Figure 1 This is a flowchart of a method for implementing error correction of 5G core network service interface slices provided by an embodiment of the present invention. This embodiment can be applied to the case of 5G core network user registration. The method can be applied to the 5G core network, which can include AMF network elements, NRF network elements and at least one UDM network element. Each network element can be implemented by software and / or hardware.

[0045] like Figure 1 As shown, the method specifically includes the following steps:

[0046] Step 110: The AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information based on 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. The user registration request contains the user's subscription permanent identifier.

[0047] Optionally, prior to step 110, the implementation method for 5G core network service-oriented interface slice error correction provided in this embodiment may further include the following steps:

[0048] 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 various UDM network elements based on the UDM network element name.

[0049] Furthermore, before the AMF network element sends the initial UDM service request to the NRF network element, and the NRF network element determines the initial UDM network element from among the various UDM network elements based on the UDM network element name, the 5G core network service-oriented interface slice error correction implementation method provided in this embodiment may also include the following steps:

[0050] AMF network elements register services with NRF network elements; each UDM network element registers services with NRF network elements separately.

[0051] Specifically, the AMF (Access and Mobility Management Function) network element operates normally and registers its services with the NRF (Network Repository Function) network element. The UDM (Unified Data Management) network element operates normally and registers its services with the NRF network element. The AMF network element requests UDM services from the NRF network element. At this time, the AMF network element sends an initial UDM service request to the NRF network element without carrying its own slice information. The NRF network element determines the initial UDM network element from the registered UDM network elements based on the UDM network element name. For example, it can search by UDM network element name and determine the UDM network element corresponding to the first UDM information found as the initial UDM network element.

[0052] When the NRF network element locates the initial UDM network element, it returns the corresponding initial UDM information to the AMF network element. This initial UDM information can include all service information of the initial UDM network element, such as its IP address, port number, and service capabilities. After obtaining the initial UDM information, the AMF network element initiates a link establishment request to the initial UDM network element. Upon receiving the link establishment request from the AMF, the initial UDM network element replies with a successful link establishment response, and the AMF network element and the initial UDM network element establish a link relationship.

[0053] When a user logs in, they send login information containing their subscription permanent identifier to the AMF network element. In this embodiment, the user's subscription permanent identifier can be a SUPI (Subscription Permanent Identifier) ​​number. After obtaining the user's subscription permanent identifier, the AMF network element sends a user registration request to the initial UDM network element, wherein the user registration request contains the SUPI.

[0054] Optionally, after the AMF network element sends a user registration request to the initial UDM network element, the 5G core network user registration method provided in this embodiment may further include the following steps:

[0055] The initial UDM network element determines the target slice to which the user belongs based on 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 the user registration.

[0056] Specifically, when the initial UDM network element receives a user registration request from the AMF network element, it retrieves the subscription permanent identifier from the request and determines the slice information to which the subscription permanent identifier belongs, marking that slice as the user's target slice. The initial UDM network element determines its own slice information and checks if it matches the target slice; if they do not match, the initial UDM network element rejects the user registration. It can be understood that the UDM network element can acquire and store the user's subscription data, including the subscription permanent identifier, and periodically send service update messages to the NRF network element, reporting the slice information corresponding to the SUPI number.

[0057] Step 120: When the initial UDM network element rejects the user registration request based on the user registration request, the AMF network element sends a UDM service request containing a subscription permanent identifier to the NRF network element.

[0058] Specifically, when the initial UDM network element determines that the user's slice is inconsistent with its own slice based on the subscription permanent identifier in the user registration request, the initial UDM network element can return an error response to the AMF network element, rejecting the user registration. When the AMF network element receives the error response from the initial UDM network element, it can send a UDM service request containing the subscription permanent identifier to the NRF network element.

[0059] Step 130: The NRF network element determines the target UDM network element from among the various 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 to achieve successful user registration.

[0060] The target UDM element can be understood as a UDM element whose slice information is consistent with the user's subscription permanent identifier.

[0061] Specifically, the NRF network element can determine the target UDM network element that matches the slice information of the UDM service request sent by the AMF network element based on the subscription permanent identifier in the UDM service request. The NRF network element then returns the target UDM information of the target UDM network element to the AMF network element. The AMF network element can then establish a link relationship with the target UDM network element based on the target UDM information to complete the user registration operation.

[0062] Optionally, step 130 can be implemented through the following specific steps:

[0063] S1301 and NRF network elements determine the target slice to which the user belongs based on the subscription permanent identifier in the UDM service request, and identify the UDM network element whose slice is the target slice as the target UDM network element.

[0064] S1302, NRF network element sends the target UDM information corresponding to the target UDM network element to AMF network element.

[0065] S1303, 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.

[0066] S1304. The AMF network element sends a user registration request to the target UDM network element, and the target UDM network element replies to the AMF network element with a registration success response.

[0067] Specifically, when an NRF network element receives a UDM service request from an AMF network element, it can obtain a subscription permanent identifier from the UDM service request. Based on the subscription permanent identifier, it determines the target slice to which the user belongs and identifies 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. After the AMF network element establishes a link relationship with the target UDM network element based on the target UDM information, it sends a user registration request to the target UDM network element. The target UDM network element determines that the user's slice is consistent with its own slice based on the subscription permanent identifier in the user registration request. The target UDM network element then replies to the AMF network element with a registration success response, at which point the user is successfully registered.

[0068] For example, Figure 2 This is a schematic diagram illustrating the principle of a method for implementing error correction of 5G core network service-oriented interface slices provided in an embodiment of the present invention. Figure 2 The AMF shown represents the AMF network element, NRF represents the NRF network element, and UDM represents the initial UDM network element. In this example, the initial UDM network element is not the same UDM network element as the target UDM network element corresponding to the slice to which the user's SUPI number belongs. The main steps may include:

[0069] 1) The initial UDM network element operates normally and registers services with the NRF network element;

[0070] 2) The AMF network element is operating normally and registering services with the NRF network element;

[0071] 3) The AMF network element sends an initial UDM service request to the NRF network element;

[0072] 4) The NRF network element determines the UDM network element corresponding to the first UDM information found based on the network element name as the initial UDM network element, and 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.

[0073] 5) The AMF network element initiates a link establishment request Nnrf_discovery_req to the initial UDM network element;

[0074] 6) The initial UDM network element replies to the AMF network element with a successful link establishment response Nnrf_discovery_rsp, and the AMF network element establishes a link relationship with the initial UDM network element;

[0075] 7) When a user comes online, the AMF network element obtains the user's subscription permanent identifier (SUPI) number and sends a User Register request (SUPI) containing the SUPI number range to the initial UDM network element.

[0076] 8) The initial UDM network element obtains the SUPI number from the user registration request, determines that the slice information to which the SUPI number belongs is inconsistent with its own slice information, and sends a User Registerresponse_Err to the AMF network element to refuse user registration;

[0077] 9) The AMF network element sends a UDM Service Request (SUPI) containing the SUPI number range to the NRF network element;

[0078] 10) The NRF network element determines the target UDM network element based on 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;

[0079] 11) When the AMF network element obtains the target UDM information, it can return to perform steps similar to 5), establish a link relationship with the target UDM network element, and complete the user registration operation.

[0080] The technical solution of this embodiment is applied to the 5G core network. In the 5G core network, the AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information based on 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. The user registration request contains the user's subscription permanent identifier. When the initial UDM network element rejects the user registration based on the user registration request, the AMF network element sends a UDM service request containing the subscription permanent identifier to the NRF network element. 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 to achieve successful user registration. This solves the problem of user online failure caused by the ambiguity of the existing core network system, and achieves the effect of automatically completing slice error correction and ensuring normal user online under the premise of normal operation of the 5G core network.

[0081] Based on the above technical solution, the 5G core network may further include at least one SMF network element. Correspondingly, the method provided in this embodiment of the invention can also enable session creation between a user and a target SMF network element.

[0082] Figure 3 This is a flowchart illustrating another method for implementing 5G core network service-oriented interface slice error correction according to an embodiment of the present invention. This embodiment further optimizes the above-described method for implementing 5G core network service-oriented interface slice error correction based on the previous embodiment.

[0083] like Figure 3 As shown, the method specifically includes:

[0084] Step 210: The AMF network element sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information based on the initial SMF information fed back by the NRF network element. The user session establishment request includes a subscription permanent identifier.

[0085] Optionally, prior to step 210, the method provided in this embodiment may further include the following steps:

[0086] Each SMF network element registers its services with the NRF network element; the NRF network element determines the initial SMF network element from among the SMF network elements based on the SMF network element name.

[0087] Specifically, the SMF (Session Management Function) network element operates normally and registers its services with the NRF network element. The NRF network element determines the initial SMF network element from among all SMF network elements based on the SMF network element name. For example, it can search by SMF network element name and determine the SMF network element corresponding to the first SMF information found as the initial SMF network element. When the NRF network element finds the initial SMF network element, it returns the corresponding initial SMF information to the AMF network element. The initial SMF information can include all service information of the initial SMF network element, such as the SMF's IP address, port number, and service capabilities.

[0088] After a user successfully registers, a session establishment process is initiated. The user session establishment request message reaches the AMF network element via the base station. Upon receiving the terminal user's session request and obtaining the initial SMF information, the AMF network element initiates a user session establishment request to the initial SMF network element. This user session establishment request may include the user's subscription permanent identifier.

[0089] Step 220: The initial SMF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the user session establishment request. If 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.

[0090] Specifically, when the initial SMF network element receives a user session establishment request from the AMF network element, it obtains the subscription permanent identifier from the request and determines the slice information to which the subscription permanent identifier belongs, recording that slice as the user's target slice. The initial SMF network element determines its own slice information and checks if it matches the target slice. If they do not match, the initial SMF network element returns an error response to the AMF network element, rejecting the session establishment.

[0091] Step 230: The AMF network element requests SMF services from the NRF network element based on the user's subscription permanent identifier to establish a session between the user and the target SMF network element.

[0092] The target SMF network element can be understood as an SMF network element whose slice information is consistent with the user's subscription permanent identifier.

[0093] Specifically, when the initial SMF network element refuses to establish a session, and the AMF network element receives an error response from the initial SMF network element, it can re-request the SMF service from the NRF network element based on the subscription permanent identifier.

[0094] Optionally, step 230 can be implemented through the following specific steps:

[0095] S2301. When the initial SMF network element found by the NRF network element fails to create a session with the AMF network element, the AMF network element sends an SMF service request containing a subscription permanent identifier to the NRF network element.

[0096] Specifically, when the initial SMF network element returns an error response to the AMF network element, rejecting the session establishment, the AMF network element loads the user's subscription permanent identifier into the SMF service request and sends it to the NRF network element.

[0097] S2302, the NRF network element determines the target SMF network element from each SMF network element according to the SMF service request, and returns the target SMF information of the target SMF network element to the AMF network element.

[0098] Furthermore, the NRF network element determines the target SMF network element from among the various SMF network elements based on the SMF service request. This can be achieved in the following way: the NRF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the SMF service request, and identifies the SMF network element whose slice is the target slice as the target SMF network element.

[0099] Specifically, the NRF network element can 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 that slice as the user's target slice. The NRF network element can identify 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 element.

[0100] S2303, the AMF network element creates a session between the user and the target SMF network element based on the target SMF information.

[0101] Specifically, the AMF network element can send a user session establishment request to the target SMF network element based on the target SMF information. The target SMF network element determines that the user's slice is consistent with its own slice based on the subscription permanent identifier in the user session establishment request. The target SMF network element replies to the AMF network element with a successful session creation response, at which point the user session creation is complete.

[0102] For example, Figure 4 This is a schematic diagram illustrating the principle of another method for implementing error correction of 5G core network service-oriented interface slices provided in this embodiment of the invention. Figure 4 The AMF shown represents an AMF network element, NRF represents an NRF network element, UDM represents a target UDM network element that matches the slice to which the user's SUPI number belongs, and SMF represents an initial SMF network element. In this example, the initial SMF network element is not the same as the target SMF network element corresponding to the slice to which the user's SUPI number belongs. The main steps may include:

[0103] 1) The target UDM network element is operating normally and registering services with the NRF network element;

[0104] 2) The AMF network element is operating normally and registering services with the NRF network element;

[0105] 3) The initial UDM network element operates normally and registers services with the NRF network element;

[0106] 4) The AMF network element requests UDM information from the NRF network element, successfully completing the user registration process;

[0107] 5) The AMF network element sends a User Session Establishment Request (PDU) to the initial SMF network element;

[0108] 6) The initial SMF network element obtains the SUPI number from the user session establishment request, determines that the slice information to which the SUPI number belongs is inconsistent with its own slice information, and sends a session establishment rejection response PDUSEssion Establishment Response_Err to the AMF network element;

[0109] 7) The AMF network element sends an SMF Service Request (SUPI) containing the SUPI number range to the NRF network element;

[0110] 8) The NRF network element determines the target SMF network element based on 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;

[0111] 9) When the AMF network element obtains the target SMF information, it can return to perform steps similar to 5) and send a user session establishment request to the target SMF network element to complete the user session creation operation.

[0112] The technical solution of this embodiment is applied to the 5G core network. In the 5G core network, the AMF network element sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information based on the initial SMF information fed back by the NRF network element. The user session establishment request includes a subscription permanent identifier. The initial SMF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the user session establishment request. When the target slice is inconsistent with the slice to which the initial SMF network element belongs, the initial SMF network element refuses to establish the session. The AMF network element requests SMF service from the NRF network element based on the user's subscription permanent identifier to realize the creation of a session between the user and the target SMF network element. This solves the problem of user online failure caused by ambiguous network topology in the existing core network system. It realizes the effect of automatically completing slice error correction and ensuring normal user online and session creation under the premise of normal operation of the 5G core network.

[0113] It is worth noting that the various units and modules included in the above embodiments are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0114] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for implementing error correction of service-oriented interface slices in a 5G core network, applied to a 5G core network, wherein the 5G core network includes AMF network elements, NRF network elements, and at least one UDM network element, characterized in that, include: The AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information based on 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. The user registration request contains the user's subscription permanent identifier. When the initial UDM network element rejects the user registration based on the user registration request, the AMF network element sends a UDM service request containing the subscription permanent identifier to the NRF network element; The NRF network element determines the target UDM network element from among 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 to achieve successful user registration, including: The NRF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the UDM service request, and identifies 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 based on 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. The target UDM network element determines that the user's slice is consistent with its own slice based on the subscription permanent identifier in the user registration request. The target UDM network element then replies to the AMF network element with a registration success response.

2. The method for implementing error correction of 5G core network service-oriented interface slices according to claim 1, characterized in that, Before the AMF network element establishes a link relationship with the initial UDM network element corresponding to the initial UDM information based on the initial UDM information fed back by the NRF network element, the process 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 each of the UDM network elements according to the UDM network element name.

3. The method for implementing error correction of 5G core network service interface slices according to claim 2, characterized in that, Before the AMF network element sends an initial UDM service request to the NRF network element, and before the NRF network element determines the initial UDM network element from among the UDM network elements based on the UDM network element name, the process further includes: The AMF network element registers services with the NRF network element; Each of the UDM network elements registers its services with the NRF network element.

4. The method for implementing error correction of 5G core network service interface slices according to claim 1, characterized in that, The initial UDM network element rejects user registration based on the user registration request, including: The initial UDM network element determines the target slice to which the user belongs based on 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 will refuse user registration.

5. The method for implementing error correction of 5G core network service-oriented interface slices as described in claim 1, characterized in that, The 5G core network also includes at least one SMF network element; Accordingly, after successful user registration, the process also includes: The AMF network element requests SMF services from the NRF network element based on the user's subscription permanent identifier, so as to realize the creation of a session between the user and the target SMF network element.

6. The method for implementing error correction of 5G core network service interface slices according to claim 5, characterized in that, Before the AMF network element requests SMF services from the NRF network element based on the user's subscription permanent identifier, 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 based on the initial SMF information fed back by the NRF network element. The user session establishment request includes the subscription permanent identifier. The initial SMF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the user session establishment request; When the target slice is inconsistent with the slice to which the initial SMF network element belongs, the initial SMF network element refuses to establish a session.

7. The method for implementing error correction of 5G core network service-oriented interface slices according to claim 6, characterized in that, Before the AMF network element sends a user session establishment request to the initial SMF network element corresponding to the initial SMF information based on the initial SMF information fed back by the NRF network element, the method further includes: Each of the SMF network elements registers its services with the NRF network element. The NRF network element determines the initial SMF network element from each of the SMF network elements based on the SMF network element name.

8. The method for implementing error correction of 5G core network service-oriented interface slices according to claim 5, characterized in that, The AMF network element requests SMF services from the NRF network element based on the user's subscription permanent identifier to establish a session between the user and the target SMF network element, including: When the initial SMF network element found by the NRF network element fails to create a session with the AMF network element, the AMF network element sends an SMF service request containing the subscription permanent identifier to the NRF network element. The NRF network element determines the target SMF network element from each SMF network element 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 establishes a session between the user and the target SMF network element based on the target SMF information.

9. The method for implementing error correction of 5G core network service interface slices according to claim 8, characterized in that, The NRF network element determines the target SMF network element from among the SMF network elements according to the SMF service request, including: The NRF network element determines the target slice to which the user belongs based on the subscription permanent identifier in the SMF service request, and identifies the SMF network element whose slice is the target slice as the target SMF network element.

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