Search

CN-116567802-B - Method for realizing 5G core network service interface slice error correction

CN116567802BCN 116567802 BCN116567802 BCN 116567802BCN-116567802-B

Abstract

The invention discloses a method for realizing slice error correction of a 5G core network service interface. The method is applied to a 5G core network, the 5G core network including but not limited to an AMF network element, an NRF network element and at least one UDM network element. The method comprises the steps that an AMF network element establishes a link relation with an initial UDM network element corresponding to the initial UDM information according to initial UDM information fed back by an NRF network element, and sends a user registration request to the initial UDM network element when a user is online, wherein the user registration request comprises a subscription permanent identifier of the user, when the initial UDM network element refuses user registration according to the user registration request, the AMF network element sends a UDM service request comprising the subscription permanent identifier to the NRF network element, and the NRF network element determines a target UDM network element from all 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 realize successful user registration. The invention can finish slice error correction on the premise of normal operation of the system, and realize normal online of users.

Inventors

  • CAO JING
  • Lv Chuntao

Assignees

  • 海能达通信股份有限公司

Dates

Publication Date
20260508
Application Date
20220129

Claims (9)

  1. 1. The method for implementing the slice error correction of the 5G core network service interface is applied to a 5G core network, and the 5G core network comprises an AMF network element, an NRF network element and at least one UDM network element, and is characterized by comprising the following steps: The AMF network element establishes a link relation with an 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 a user is online, wherein the user registration request comprises a subscription permanent identifier of the user; When the initial UDM network element refuses 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; the NRF network element determines a target UDM network element from 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 to realize successful registration of the user, comprising: The NRF network element determines a target slice to which the user belongs according to the subscription permanent identifier in the UDM service request, and determines the UDM network element of which the slice belongs to as the target slice as a target UDM network element; the NRF network element sends 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 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 judges that the slice to which the user belongs is consistent with the slice to which the user belongs according to a subscription permanent identifier in the user registration request, and the target UDM network element replies a registration success response to the AMF network element.
  2. 2. The method for implementing slice error correction of a 5G core network servitization interface according to claim 1, wherein before the AMF network element establishes a link relationship with an initial UDM network element corresponding to the initial UDM information according to the initial UDM information fed back by the NRF network element, further comprising: 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 UDM network element name.
  3. 3. The method for implementing slice error correction of a 5G core network servitization interface according to claim 2, wherein before the AMF network element sends an initial UDM service request to the NRF network element, the NRF network element determines the initial UDM network element from each UDM network element according to a UDM network element name, further comprising: the AMF network element registers service to the NRF network element; each UDM network element registers service with the NRF network element respectively.
  4. 4. The method for implementing slice error correction of a 5G core network servitization interface according to claim 1, wherein the initial UDM network element refuses user registration according to the user registration request, comprising: The initial UDM network element determines a target slice to which the user belongs according to a subscription permanent identifier in the user registration request; And if the target slice is inconsistent with the slice to which the initial UDM network element belongs, the initial UDM network element refuses the user registration.
  5. 5. The method for implementing slice error correction of a 5G core network servitization interface of claim 1, wherein the 5G core network further comprises at least one SMF network element; Correspondingly, after the successful registration of the user is realized, the method further comprises the following steps: And the AMF network element requests SMF service to the NRF network element according to the subscription permanent identifier of the user so as to realize the session creation of the user and the target SMF network element.
  6. 6. The method for implementing 5G core network servitization interface slice error correction according to claim 5, wherein before the AMF network element requests SMF service from the NRF network element according to the subscription permanent identifier of the user, further comprising: The AMF network element sends a user session establishment request to an initial SMF network element corresponding to the initial SMF information according to the initial SMF information fed back by the NRF network element, wherein the user session establishment request comprises the subscription permanent identifier; the initial SMF network element determines a target slice to which the user belongs according to a 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 refuses the session establishment.
  7. 7. The method for implementing slice error correction of a 5G core network servitization interface according to claim 6, wherein before the AMF network element sends a user session establishment request to an initial SMF network element corresponding to the initial SMF information according to the initial SMF information fed back by the NRF network element, the method further comprises: each SMF network element registers service to the NRF network element respectively; And the NRF network element determines the initial SMF network element from the SMF network elements according to the SMF network element name.
  8. 8. The method for implementing slice error correction of a 5G core network servitization interface according to claim 5, wherein the AMF network element requests SMF service to the NRF network element according to a subscription permanent identifier of the user, so as to implement session creation between the user and a target SMF network element, comprising: when the initial SMF network element searched by the NRF network element fails to establish 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 a target SMF network element from the SMF network elements according to the SMF service request, and returns target SMF information of the target SMF network element to the AMF network element; And the AMF network element realizes the session creation between the user and the target SMF network element according to the target SMF information.
  9. 9. The method for implementing 5G core network servitization interface slice error correction according to claim 8, wherein the NRF network element determines a target SMF network element from the SMF network elements according to the SMF service request, comprising: And the NRF network element determines a target slice to which the user belongs according to the subscription permanent identifier in the SMF service request, and determines the SMF network element of which the slice belongs to as the target slice as a target SMF network element.

Description

Method for realizing 5G core network service interface slice error correction Technical Field The embodiment of the invention relates to the technical field of 5G core networks, in particular to a method for realizing slice error correction of a 5G core network service interface. Background The service interface function of the 5GC (5G Core Network) mainly takes NRF (Network Repository Function, network storage function) as a core, and the NRF network element supports a service discovery function and provides the discovered NF instance information to the NF instance requesting the discovery service. At present, NRF cannot ensure to select correct NF instance information in core network networking scenes with and without slicing network elements, which results in fuzzy networking of the system, and when a user is online, the problem of user online failure often occurs, and the elastic fault tolerance of the system is very weak. Disclosure of Invention The invention provides a method for realizing slice error correction of a 5G core network service interface, which is used for completing slice error correction on the premise of normal operation of a 5GC system and ensuring normal online of a user. The embodiment of the invention provides a 5G core network user registration method, which comprises the following steps: The AMF network element establishes a link relation with an 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 a user is online, wherein the user registration request comprises a subscription permanent identifier of the user; When the initial UDM network element refuses 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; And the NRF network element determines a target UDM network element from 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 realize successful registration of the user. Optionally, 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, the method further 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 UDM network element according to the UDM network element name. Optionally, before the AMF network element sends an initial UDM service request to the NRF network element, the NRF network element determines the initial UDM network element from each UDM network element according to a UDM network element name, the method further includes: the AMF network element registers service to the NRF network element; each UDM network element registers service with the NRF network element respectively. Optionally, the initial UDM network element refuses the user registration according to the user registration request, including: The initial UDM network element determines a target slice to which the user belongs according to a subscription permanent identifier in the user registration request; And if the target slice is inconsistent with the slice to which the initial UDM network element belongs, the initial UDM network element refuses the user registration. Optionally, the NRF network element determines a target UDM network element from each UDM network element 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 implement successful registration of the user, including: The NRF network element determines a target slice to which the user belongs according to the subscription permanent identifier in the UDM service request, and determines the UDM network element of which the slice belongs to as the target slice as a target UDM network element; the NRF network element sends 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 a link establishment response to the AMF network element; And 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. Optionally, the 5G core network further includes at least one SMF network element; Correspondingly, after the successful registration of the user is realized, the method further comprises the foll