WO2024140220A1 - Method and system for prohibiting terminal from accessing network in core network roaming scenario - Google Patents

Abstract

The present disclosure relates to the technical field of communications. Provided are a method and system for forbidding a terminal from accessing a network in a core network roaming scenario, and a computer device and a storage medium. The method comprises: a V-AMF of a visited 5G network determining, on the basis of acquired data signaling, whether a UE is a roaming user; after determining that the UE is a roaming user, the V-AMF sending a registration acceptance message to the UE; the UE determining, according to the received registration acceptance message, whether the UE itself satisfies a capability supported by the visited 5G network; and after determining that the visited 5G network supports VoNR but the UE itself does not support the VoNR, the UE initiating a de-registration request to the visited 5G network.

Description

Method and system for prohibiting terminal from accessing network in core network roaming scenario Technical Field

The present disclosure relates to the field of communication technology, and in particular to a method for prohibiting a terminal from accessing a network in a core network roaming scenario, a system for prohibiting a terminal from accessing a network in a core network roaming scenario, a computer device, and a computer-readable storage medium.

Background technique

5G inter-network roaming can accelerate the construction of new 5G infrastructure, promote network openness and sharing, reduce the duplication of 5G network construction, and realize 5G network coverage and business development in an intensive and efficient manner, providing services for a wider range of user groups. 5G inter-network roaming includes two technical implementation methods: core network roaming and access network sharing. Among them, 5G core network roaming refers to an operator building a complete 5G network (including wireless network and core network), and other operators' users access the network through roaming. Through the interconnection of the core networks of both parties, the service provision is completed and mobile communication services are used. Under the 5G independent networking (SA) network architecture, core network roaming adopts the home routing method defined by 3GPP (3rd Generation Partnership Project), that is, the data of roaming users returns to the home network, and the user services are handled by the home network. In the network that provides 5G core network roaming, data services, voice/video services based on IMS, and SMS over IP short message services should also be provided to users.

In traditional 5G inter-network roaming, when terminal UE B, which belongs to 5G network B and does not support VoNR voice service, roams to operator A's visited 5G network (core network roaming area/5G shared area), voice service cannot be initiated, which greatly affects the user experience.

Summary of the invention

According to one aspect of the present disclosure, a method for prohibiting a terminal from accessing a network in a core network roaming scenario is provided, characterized in that it includes: step S1, in a scenario where the terminal UE moves from a home 4G or 5G network to a visited 5G network in a connected state, the visited access mobility management function V-AMF of the visited 5G network determines the terminal UE based on the acquired data signaling Whether it is a roaming user; Step S2, after determining that the terminal UE is a roaming user, V-AMF sends a registration acceptance message to the terminal UE; Step S3, the terminal UE determines whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message; and Step S4, after determining that the visited 5G network supports VoNR and the terminal UE itself does not support VoNR, the terminal UE initiates a deregistration request to the visited 5G network. In the above step S2 in which V-AMF sends a registration acceptance message to the terminal UE after determining that the terminal UE is a roaming user, the registration acceptance message carries extended 5GS network feature support information to indicate to the terminal UE whether the visited 5G network supports VoNR and VoLTE. In the above step S3 in which the terminal UE determines whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message, the terminal UE determines whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration acceptance message.

In an exemplary embodiment, in the step of V-AMF sending a registration acceptance message to the terminal UE, the IMS-VoPS-3GPP and 0Spare fields in the extended 5GS network feature support information carried in the registration acceptance message are extended to IMS-VoNR-3GPP and IMS-VoLTE-3GPP, and the identification indication of the IMS-VoNR-3GPP field is set to 1 and the identification indication of the IMS-VoLTE-3GPP field is set to 0, so as to indicate to the terminal UE that the visited 5G network supports VoNR but does not support VoLTE. In the step of the terminal UE judging whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message, by identifying the identification indications of the IMS-VoNR-3GPP field and the IMS-VoLTE-3GPP field in the 5GS network feature support information in the registration acceptance message, the terminal UE judges that the visited 5G network supports VoNR but does not support VoLTE.

In an exemplary embodiment, before the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the terminal UE has completed registration with the home 5G network, and the home 5G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID under the home 5G network, sets the shared PLMN ID to a high-priority PLMN, and establishes a protocol data unit PDU session, and the terminal UE is in a CM-CONNETED state. The scenario in which the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state is a scenario in which the terminal UE performs a connected mobility registration update from the registered home 5G network to the visited 5G network. The V-AMF of the visited 5G network is based on Step S1 of determining whether the terminal UE is a roaming user based on the acquired data signaling includes: step S1A1, the terminal UE moves from the home 5G network to the visited 5G network, triggering the mobility registration update process of the AMF change; step S1A2, V-AMF receives the initial UE information of the terminal UE sent by the base station of the visited 5G network, and V-AMF obtains the PLMN ID in the user location information carried in the initial UE information; step S1A3, the terminal UE initiates a registration request to the V-AMF through the V-NG-Ran visited network base station, and the registration request carries 5G-GUTI, registration type, and UE security capability; step S1A4, V-AMF sends a Namf_Communicaiton_UEContextTransfer Request message to the home access mobility management function H-AMF, requesting to obtain the user context information of the terminal UE; step S1A5, H-AMF returns the V-AMF user context information, including SUPI; and step S1A6, the terminal UE executes the registration process of mobility update in the roaming scenario.

In an exemplary embodiment, before the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the terminal UE has completed the attachment to the home 4G network, and the home 4G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID under the home 4G network, sets the shared PLMN ID to a high-priority PLMN, and establishes a protocol data unit PDU session, and the terminal UE is in a CM-CONNETED state. The scenario in which the terminal UE moves from the home 4G or 5G network in a connected state to the visited 5G network is a scenario in which the terminal UE updates the mobility registration in a non-N26 interface interoperability connection state from the home 4G network to which it has completed the attachment to the visited 5G network. The step S1 in which the V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on the acquired data signaling includes: step S1B1, the terminal UE moves from the home 4G network to the visited 5G network, triggering the mobility registration update process changed by the AMF; step S1B2, the V-AMF receives the initial UE information of the terminal UE sent by the base station of the visited 5G network, and the V-AMF obtains the PLMN ID in the user location information carried in the initial UE information; step S1B3, the terminal UE initiates a registration request to the V-AMF through the V-NG-Ran visited network base station, and the registration request carries 5G-GUTI, registration type, and UE security capability; step S1B4, since the N26 interface is not configured between the V-AMF and the home network H-MME, the V-AMF sends an Identity Request message to the terminal UE to request to obtain the subscription hidden identifier SUCI; step S1B5, the terminal UE returns SUCI to the V-AMF through an Identity response message; and step S1B6, the terminal UE executes the registration process for mobility update in the roaming scenario.

In an exemplary embodiment, before the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the terminal UE has completed registration with the home 5G network, and the home 5G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID under the home 5G network, sets the shared PLMN ID to a high-priority PLMN, and establishes a protocol data unit PDU session, and the terminal UE is in a CM-CONNETED state. The scenario in which the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state is a scenario in which the terminal UE switches from the home network 5G to the visited network 5G. Step S1 of the V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on the acquired data signaling includes: a switching process from the home 5G network to the visited 5G network. In the switching process, H-AMF sends a context creation request Namf_Communication_CreateUEContext Request of the terminal UE to V-AMF, and H-AMF and V-AMF exchange the UE context of the terminal UE. The UE context carries UE context information. The UE context information includes the SUPI of the terminal UE, the mobile context list, the session context list, and the N2SM information including the Target ID.

In an exemplary embodiment, in a scenario where a terminal UE moves from a home 4G or 5G network to a visited 5G network in a connected state, in the step of the visited access mobility management function V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on acquired data signaling, the data signaling acquired by the V-AMF is the PLMN ID in the tracking area identifier TAI, and the PLMN ID in the tracking area identifier TAI is acquired by the V-AMF from the User Location Information in the Initial UE Message of the terminal UE in the mobility registration update process, and the terminal UE directly sends it to the V-AMF via a NAS message. When the PLMN ID in the TAI is shared network number information, the terminal UE is a roaming user.

In an exemplary embodiment, in a scenario where the terminal UE moves from its home 4G or 5G network to a visited 5G network in a connected state, in the step of the visited access mobility management function V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on the acquired data signaling, the data signaling acquired by the V-AMF is the PLMN ID in the tracking area identifier TAI, and the PLMN ID in the tracking area identifier TAI is acquired by the V-AMF from the Target ID in the UE context creation request Namf_Communicaiton_CreateUEContext Request message sent by the H-AMF in the switching process. When the PLMN ID in the TAI is shared network number information, the terminal UE is a roaming user.

In an exemplary embodiment, in a scenario where the terminal UE moves from its home 4G or 5G network to a visited 5G network in a connected state, in the step in which the visited access mobility management function V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on the acquired data signaling, the MCC+MNC of the UE is obtained by V-AMF from the user permanent identifier SUPI of the terminal UE carried in the UE context creation request Namf_Communicaiton_CreateUEContext Request message sent by H-AMF to V-AMF in the switching process. When the MCC+MNC is the HPLMN ID of the terminal UE, the UE is a roaming user.

In an exemplary embodiment, in the step of the terminal UE initiating a deregistration request to the visited 5G network, the terminal UE initiates a deregistration process to the visited 5G network, releases the session and wireless resources, the Deregistration type carried in the deregistration request is not supported by UE capabilities, and the terminal UE sets its shared PLMN to FPLMN. The terminal UE that does not support VoNR will no longer access the visited 5G network subsequently.

In an exemplary embodiment, in the step in which the V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on the acquired data signaling, the data signaling acquired by the V-AMF is the PLMN ID in the MCC+MNC or TAI.

According to another aspect of the present disclosure, a system for prohibiting a terminal from accessing a network in a core network roaming scenario is provided, the system comprising:

A judgment module, which is configured to determine whether the terminal UE is a roaming user based on the acquired data signaling in a scenario where the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state;

A sending module, which is configured to send a registration acceptance message to the terminal UE through the V-AMF after determining that the terminal UE is a roaming user, wherein the registration acceptance message carries extended 5GS network feature support information to indicate to the terminal UE whether the visited 5G network supports VoNR and VoLTE; and

A receiving module is configured to receive information sent by the terminal UE after the terminal UE determines whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message, wherein the terminal UE determines whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration acceptance message, and determines that the visited 5G network supports IMS-VoNR-3GPP while the terminal UE itself does not support VoNR Afterwards, a de-registration request initiated by the receiving terminal UE to the visited 5G network.

According to another aspect of the present disclosure, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor runs the computer program stored in the memory, the processor executes the method for prohibiting a terminal from accessing a network in the aforementioned core network roaming scenario.

According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the processor executes the method for prohibiting a terminal from accessing a network in the aforementioned core network roaming scenario.

Other features and advantages of the present disclosure will be described in the following description, and partly become apparent from the description, or be understood by practicing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained by the structures particularly pointed out in the description, claims and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide further understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure.

FIG1 is a flow chart of a method for prohibiting a terminal from accessing a network in a core network roaming scenario provided by an embodiment of the present disclosure;

FIG2 is a flow chart of the steps of determining whether a terminal UE is a roaming user in a specific scenario according to a method provided by an embodiment of the present disclosure;

FIG3 is a flow chart of the steps of determining whether a terminal UE is a roaming user in a specific scenario according to a method provided by an embodiment of the present disclosure;

FIG4 is a flow chart of the steps of determining whether a terminal UE is a roaming user in a specific scenario according to a method provided by an embodiment of the present disclosure;

FIG5 is a schematic diagram of the structure of a system for prohibiting a terminal from accessing a network in a core network roaming scenario provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of the structure of a computer device provided in an embodiment of the present disclosure.

Detailed ways

To make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the specific implementation methods of the present disclosure are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

In the context of core network roaming scenarios, in the 5G shared area, i.e., the visited network, there are the following scenarios: In the 5G shared area, there are both 4G signals of the home network operator and shared 5G signals of the visited operator, and roaming users have priority access to the shared 5G of the visited network operator. There is no N26 interface (interface between the home network H-MME and the roaming network V-AMF) between the home network 4G core network and the roaming network 5G core network, but the N14 interface (interface between the home network H-AMF and the roaming network V-AMF) is enabled. In the 5G shared area in the above scenario, there is no N26 interface (interface between the home network H-MME and the roaming network V-AMF) between the home network 4G core network and the roaming network 5G core network, but the N14 interface (interface between the home network H-AMF and the roaming network V-AMF) is enabled. Since the shared area voice service uses VoNR (Voice over New Radio) and does not support EPS Fallback (falling back to the LTE network and provided by VoLTE) voice service, the network needs to enable VoNR. However, when the terminal UE B of the home 5G network B that does not support VoNR voice service roams to the visited 5G network of operator A (core network roaming area/5G shared area), it cannot initiate voice service, which greatly affects the user experience.

The disclosed embodiment provides a method for prohibiting a terminal from accessing a network in a core network roaming scenario.

FIG1 is a flow chart of a method for prohibiting a terminal from accessing a network in a core network roaming scenario provided by an embodiment of the present disclosure. The method comprises the following steps:

Step S1: In a scenario where the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the V-AMF (Visited Access and Mobility Management Function) of the visited 5G network determines whether the terminal UE is a roaming user based on the PLMN ID in the acquired data signaling;

Step S2: After determining that the terminal UE is a roaming user, the V-AMF sends a registration acceptance message to the terminal UE, wherein the registration acceptance message carries extended 5GS network feature support information to indicate to the terminal UE whether the visited 5G network supports VoNR and VoLTE;

Step S3, the terminal UE determines whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message, wherein the terminal UE determines whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration acceptance message; and

Step S4: After determining that the visited 5G network supports IMS-VoNR-3GPP and the terminal UE itself does not support VoNR, the terminal UE initiates a deregistration request to the visited 5G network.

As a result, the following technical problems existing in the prior art are at least partially solved: in the 5G shared area, there are both 4G signals of the home network operator and shared 5G signals of the visited operator. Roaming users give priority to accessing the shared 5G of the visited network operator, resulting in the terminal UE of the home 5G network that does not support VoNR voice services being unable to initiate voice services when roaming to the visited 5G network (core network roaming area/5G shared area) of the visited operator.

In some embodiments, the IMS-VoPS-3GPP and 0Spare fields in the 5GS network feature support information (see 3GPP TS24.501 9.11.3.5 for the original protocol; Table 1 below) in the registration acceptance message sent by V-AMF to the terminal UE can be extended to IMS-VoNR-3GPP and IMS-VoLTE-3GPP (see Table 2 below). The identification indication of the IMS-VoNR-3GPP field is set to 1 and the identification indication of the IMS-VoLTE-3GPP field is set to 0, so as to indicate to the terminal UE that the visited 5G network supports VoNR but not VoLTE. In the step in which the terminal UE determines whether it meets the capabilities supported by the visited 5G network based on the received registration acceptance message, by identifying the identification indications of the IMS-VoNR-3GPP field and the IMS-VoLTE-3GPP field in the 5GS network feature support information in the registration acceptance message, the terminal UE determines that the visited 5G network supports VoNR but not VoLTE.

Table I

Table II

In the table shown in Table 2, IMS-VoPS-3GPP at the first bit of the third byte of the original protocol is modified to IMS-VoNR-3GPP: setting 0 indicates that the network does not support 3GPP access to IMS voice via NR; and setting 1 indicates that the network supports 3GPP access to IMS voice via NR. IMS-VoLTE-3GPP is added to the spare 0 Spare at the eighth bit of the fifth byte: setting 0 indicates that the network does not support 3GPP access to IMS voice via LTE; and setting 1 indicates that the network supports 3GPP access to IMS voice via LTE. In the scenario disclosed herein, the registration acceptance message sent by the V-AMF in the visited 5G network area to the terminal UE carries 5GS network feature support information, in which IMS-VoNR-3GPP is set to 1 and IMS-VoLTE-3GPP is set to 0.

In some embodiments, in step S1, the acquired data signaling may be the PLMN ID in MCC (Mobile Country Code) + MNC (Mobile Network Code) or TAI (Tracking Area Identity).

In some embodiments, the terminal UE initiates a deregistration request to the visited 5G network. In the step, the terminal UE can initiate a de-registration process to the visited 5G network to release the session and wireless resources.

In some embodiments, the de-registration type carried in the de-registration request can be set to "UE capability not supported". Specifically, the Deregistration type in the de-registration request is extended (the original protocol is shown in 3GPP TS24.501 9.11.3.20; Table 3 below; the extended protocol is shown in Table 4 below):

Table 3

Table 4

In the tables shown in Tables 3 and 4, the extension adds the UE capability not supported indicator in the reserved space at the 5th bit of the 1st byte: setting it to 0 indicates Normal de-registration (the same as setting the Switch off of the 4th bit of the 1st byte to 0); and setting it to 1 indicates UE capability not supported, that is, UE capability is not supported.

In some embodiments, the terminal UE sets its shared PLMN as FPLMN (Forbidden PLMN), and the terminal UE that does not support VoNR will no longer access the visited 5G network. Because the roaming area of the scenario also has a home 4G network signal, the UE initiates a registration process to the home 4G network, accesses the home 4G network (this network), initiates and uses voice services, and the experience is not affected.

In some embodiments, the method for prohibiting the terminal from accessing the network in the core network roaming scenario may include a scenario in which different home 4G or 5G networks are moved to a visited network 5G while in a connected state (scenario A, B, C, etc. described below).

A. The terminal UE moves from the home 5G network to the visited 5G network. new

Specifically, in some embodiments, before step S1, the terminal UE has completed registration with the home 5G network, and the home 5G network sets the shared PLMN ID of the visited 5G network to the EPLMN (equivalent PLMN) of the current PLMN ID under the home 5G network, and sets the shared PLMN ID to the EPLMN (equivalent PLMN) of the visited 5G network. The shared PLMN ID is a high priority PLMN, and a protocol data unit PDU session is established, and the terminal UE is in the CM-CONNETED state. The scenario where the terminal UE moves from the home 4G or 5G network in a connected state to the visited 5G network is a scenario where the terminal UE updates the connected state mobility registration from the registered home 5G network to the visited 5G network. In this scenario, as shown in Figure 2, step S1 may include:

Step S1A1: The terminal UE moves from the home 5G network to the visited 5G network, triggering the mobility registration update process changed by the AMF;

Step S1A2: V-AMF receives the initial UE information of the terminal UE sent by the base station of the visited 5G network, and V-AMF obtains the PLMN ID (for example, the PLMN ID in TAI) in the user location information carried in the initial UE information;

Step S1A3: The terminal UE initiates a registration request to the V-AMF through the V-NG-Ran visited network base station. The registration request carries 5G-GUTI (5G Globally Unique Temporary Identifier), registration type, and UE security capability.

Step S1A4: V-AMF sends a Namf_Communicaiton_UEContextTransfer Request message to the home access mobility management function H-AMF, requesting to obtain the user context information of the terminal UE;

Step S1A5: H-AMF returns V-AMF user context information, including SUPI (Subscription Permanent Identifier); and

Step S1A6: The terminal UE performs a registration process for mobility update in a roaming scenario.

In some embodiments, user context information may also include MM Context List, Session Context List (PDU Session IDs, S-NSSAI(s), DNN, hsmfId, vsmfId), and UE Radio Capability.

B. The terminal UE connects from the home 4G network to the visited 5G network without N26 interface interoperability Mobility Registration Update

Specifically, in some embodiments, before step S1, the terminal UE has completed the attachment to the home 4G network, and the home 4G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID under the home 4G network, sets the shared PLMN ID to the high-priority PLMN, and establishes a protocol data unit PDU session, and the terminal UE is in the CM-CONNETED state. The scenario of moving to the visited 5G network is a scenario where the terminal UE updates the mobility registration in the non-N26 interface interoperability connection state from the home 4G network to which it has completed attachment to the visited 5G network. In this scenario, as shown in FIG3 , step S1 may include:

Step S1B1: The terminal UE moves from the home 4G network to the visited 5G network, triggering the mobility registration update process changed by the AMF;

Step S1B2, V-AMF receives the initial UE information of the terminal UE sent by the base station of the visited 5G network, and V-AMF obtains the PLMN ID (for example, the PLMN ID in TAI) in the user location information carried in the initial UE information;

Step S1B3: The terminal UE initiates a registration request to the V-AMF through the V-NG-Ran visited network base station. The registration request carries 5G-GUTI, registration type, and UE security capabilities.

Step S1B4: Since the N26 interface is not configured between the V-AMF and the home network H-MME, the V-AMF sends an Identity Request message to the terminal UE to request the SUCI (Subscription Concealed Identifier).

Step S1B5: The terminal UE returns SUCI to the V-AMF via an Identity response message; and

Step S1B6: The terminal UE performs a registration process for mobility update in a roaming scenario.

C. Switching of the terminal UE from the home 5G network to the visited 5G network

Specifically, in some embodiments, before step S1, the terminal UE has completed registration with the home 5G network, the home 5G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID under the home 5G network, sets the shared PLMN ID to the high-priority PLMN, and establishes a protocol data unit PDU session, and the terminal UE is in the CM-CONNETED state. The scenario in which the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state is the scenario in which the terminal UE switches from the home network 5G to the visited network 5G. In this scenario, step S1 includes:

The handover process from the home 5G network to the visited 5G network. In this handover process, H-AMF sends a context creation request Namf_Communication_CreateUEContext Request of the terminal UE to V-AMF. H-AMF and V-AMF exchange the UE context of the terminal UE. The UE context carries UE context information. The UE context information includes the SUPI of the terminal UE, the mobile context list, the session context list, and the packet N2SM information including Target ID.

In some embodiments, in this scenario, as shown in FIG4 , step S1 may include:

Step S1C1, the home 5G network RAN sends a handover request Handover Required to the H-AMF, and the request carries the Target ID of the target base station;

Step S1C2, H-AMF selects V-AMF according to Target ID;

Step S1C3, H-AMF sends a context creation request Namf_Communication_CreateUEContext Request of the terminal UE to V-AMF, and H-AMF and V-AMF exchange the UE context of the terminal UE. The UE context carries UE context information. The UE context information includes the SUPI of the terminal UE, the mobile context list, the session context list, and the N2SM information including the Target ID;

Step S1C4: Execute session creation in roaming scenario;

Step S1C5, V-AMF sends a Handover Request to the RAN of the visited 5G network, V-AMF determines the wireless base station of the visited 5G network according to the Target ID, and allocates 5G-GUTI to the terminal UE;

Step S1C6: The visited network RAN sends a Handover Request Acknowledge to the V-AMF, which carries the PDU session list and N2SM information that need to be switched.

Step S1C7: Execute the session update process in the roaming scenario and establish an indirect forwarding tunnel;

Step S1C8: V-AMF sends a UE context creation response message to H-AMF to send N2SM information containing downlink data tunnel information to H-AMF;

Step S1C9: H-AMF sends a Handover Command to the RAN of the home 5G network.

Step S1C10: The RAN of the 5G network sends a Handover Command to the terminal UE, and an indirect forwarding tunnel for downlink user plane data is established;

Step S1C11: The terminal UE sends Handover Confirm to the RAN of the visited 5G network, the terminal UE handover is completed, and the uplink user plane tunnel from the terminal UE to the V-UPF and H-UPF is opened;

Step S1C12: The RAN of the visited 5G network sends a Handover Notify to the V-AMF, and the RAN handover of the visited 5G network is completed;

Step S1C13: V-AMF sends Namf_Communication_N2InfoNotify to H-AMF to notify H-AMF that the N2 interface switching is complete.

Step S1C14: H-AMF sends Namf_Communication_N2InfoNotify Ack to V-AMF;

Step S1C15: Execute the session update process in the roaming scenario, and open the downlink user plane tunnel; and

Step S1C16: Execute a registration process of the mobility registration update type.

In some embodiments, for example in scenario A and scenario B, the data signaling obtained by V-AMF is MCC+MNC, and the MCC+MNC of the terminal UE is obtained by V-AMF in the 5G-GUTI in the Registration Request message in the mobility registration update (from the home 4G network to the visited 5G network and from the home 5G network to the visited 5G network) process of the terminal UE, wherein MCC+MNC constitutes a PLMN ID, and a group of MCC+MNC identifies a network. When the MCC+MNC terminal is the UE's home public land mobile network identifier HPLMN ID (Home Public Land Mobile Network ID), the terminal UE is a roaming user.

In some embodiments, for example, in scenario A, the data signaling obtained by V-AMF is MCC+MNC, and the MCC+MNC of the terminal UE is obtained from the user permanent identifier SUPI of the terminal UE carried in the Namf_Communicaiton_UEContextTransfer Response message sent by H-AMF to V-AMF in the mobility registration update (from home 5G network to visited 5G network) process. When the MCC+MNC is the HPLMN ID of the terminal UE, the terminal UE is a roaming user.

In some embodiments, for example in scenario C, the MCC+MNC of the UE is obtained by V-AMF from the SUPI of the terminal UE carried in the UE context creation request Namf_Communicaiton_CreateUEContext Request message sent by H-AMF to V-AMF in the switching process. When the MCC+MNC is the HPLMN ID of the terminal UE, the UE is a roaming user.

In some embodiments, for example, in scenario A and scenario B, the data signaling obtained by the V-AMF is the PLMN ID in the TAI (Tracking Area Identity), and the PLMN ID in the TAI is obtained by the V-AMF in the User Location Information in the Initial UE Message of the terminal UE in the mobility registration update (from the home 4G network to the visited 5G network and from the home 5G network to the visited 5G network) process, and the terminal UE obtains the User Location Information in the Initial UE Message of the terminal UE through the NAS message Sent directly to V-AMF. When the PLMN ID in the TAI is shared network information, the terminal UE is a roaming user.

In some embodiments, for example in scenario C, the data signaling obtained by V-AMF is the PLMN ID in the tracking area identifier TAI, and the PLMN ID in the tracking area identifier TAI is obtained by V-AMF from the Target ID in the UE context creation request Namf_Communicaiton_CreateUEContext Request message sent by H-AMF in the switching process. When the PLMN ID in the TAI is shared network number information, the terminal UE is a roaming user.

Based on the same technical concept, the embodiment of the present disclosure also provides a system for prohibiting a terminal from accessing a network in a core network roaming scenario. As shown in FIG. 5 , the system 5 includes a judgment module 51 , a sending module 52 and a receiving module 53 .

The judgment module 51 is configured to determine whether the terminal UE is a roaming user based on the acquired data in a scenario where the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state. The visited access mobility management function V-AMF of the visited 5G network

The sending module 52 is configured to send a registration acceptance message to the terminal UE through the V-AMF after determining that the terminal UE is a roaming user. The registration acceptance message carries the extended 5GS network feature support information to indicate to the terminal UE whether the visited 5G network supports VoNR and VoLTE.

The receiving module 53 is configured to receive information sent by the terminal UE after the terminal UE determines whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message. By identifying the 5GS network feature support information in the registration acceptance message, the terminal UE determines whether the visited 5G network supports VoNR and VoLTE. If the visited 5G network supports IMS-VoNR-3GPP and the terminal UE itself does not support VoNR, the deregistration request initiated by the terminal UE to the visited 5G network is received.

Based on the same technical concept, the embodiment of the present disclosure also provides a computer device, as shown in Figure 6, the computer device 6 includes a memory 61 and a processor 62, the memory 61 stores a computer program, when the processor 62 runs the computer program stored in the memory 61, the processor 62 executes the method of prohibiting the terminal from accessing the network in the aforementioned core network roaming scenario.

Based on the same technical concept, an embodiment of the present disclosure also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the processor executes the method of prohibiting a terminal from accessing a network in the aforementioned core network roaming scenario.

The method for prohibiting a terminal from accessing the network in a core network roaming scenario provided by the embodiment of the present disclosure is a method for prohibiting a terminal from accessing the network in a core network roaming scenario, by visiting a 5G network area in a core network roaming scenario, and the network does not allow a terminal that does not support VoNR and roams to the visited network to access the visited 5G network. The present disclosure can solve the problem of refusing a terminal that does not support VoNR to access the visited network in a visited 5G network area in a core network roaming scenario, when there are both visited 5G network signals and home 4G network signals, thereby allowing the roaming terminal to access the home 4G network (this network), initiate and use voice services, and the experience is not affected.

In summary, the method, system, computer device and storage medium for prohibiting a terminal from accessing a network in a core network roaming scenario provided by the embodiments of the present disclosure can achieve the following effects: 1) V-AMF determines whether the UE is a roaming user based on the signaling policy; 2) The newly added IMS-VoLTE-3GPP and IMS-VoNR-3GPP identification information is extended in the function table supported by the 5G network in the Registration Accept message, which is used to mark and refine the functions supported by the 5G network; 3) The UE determines whether to initiate a deregistration request based on the IMS-VoLTE-3GPP and IMS-VoNR-3GPP identification information (0 or 1) of the 5GS network feature support in the Registration Accept message and its own capabilities; 4) The mobility signaling interaction process for a terminal that does not support VoNR to access a visited 5G network in a roaming scenario is defined.

A person skilled in the art can understand that all or some of the steps, systems, and functional modules/units in the above-disclosed methods can be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component can have multiple functions, or a function or step can be performed by several physical components in cooperation. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as Integrated circuits, such as application specific integrated circuits. Such software can be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, it is known to those of ordinary skill in the art that communication media generally contain computer-readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims (15)

A method for prohibiting a terminal from accessing a network in a core network roaming scenario, characterized by comprising: In a scenario where the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the visited access mobility management function V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on the acquired data signaling; After determining that the terminal UE is a roaming user, the V-AMF sends a registration acceptance message to the terminal UE, wherein the registration acceptance message carries extended 5GS network feature support information to indicate to the terminal UE whether the visited 5G network supports VoNR and VoLTE; The terminal UE determines whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message, wherein the terminal UE determines whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration acceptance message; and After determining that the visited 5G network supports VoNR but the terminal UE itself does not support VoNR, the terminal UE initiates a deregistration request to the visited 5G network. The method according to claim 1, characterized in that In the step of the V-AMF sending a registration acceptance message to the terminal UE, the IMS-VoPS-3GPP and 0 Spare fields in the extended 5GS network feature support information carried in the registration acceptance message are extended to IMS-VoNR-3GPP and IMS-VoLTE-3GPP, and the identification indication of the IMS-VoNR-3GPP field is set to 1 and the identification indication of the IMS-VoLTE-3GPP field is set to 0, so as to indicate to the terminal UE that the visited 5G network supports VoNR but does not support VoLTE; and In the step in which the terminal UE determines whether it meets the capabilities supported by the visited 5G network based on the received registration acceptance message, by identifying the identification indications of the IMS-VoNR-3GPP field and the IMS-VoLTE-3GPP field in the 5GS network feature support information in the registration acceptance message, the terminal UE determines that the visited 5G network supports VoNR but does not support VoLTE. The method according to claim 1, characterized in that Before the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the terminal UE has completed registration with the home 5G network. The home 5G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID under the home 5G network, sets the shared PLMN ID to a high-priority PLMN, and establishes a protocol data unit PDU session. The terminal UE is in the CM-CONNETED state. The scenario in which the terminal UE moves from the home 4G or 5G network in a connected state to the visited 5G network is a scenario in which the terminal UE updates the connected mobility registration from the registered home 5G network to the visited 5G network. Among them, the step of the V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on the acquired data signaling includes: The terminal UE moves from the home 5G network to the visited 5G network, triggering the mobility registration update process changed by the AMF; The V-AMF receives the initial UE information of the terminal UE sent by the base station of the visited 5G network, and the V-AMF obtains the PLMN ID in the user location information carried in the initial UE information; The terminal UE initiates a registration request to the V-AMF through the V-NG-Ran visited network base station. The registration request carries 5G-GUTI, registration type, and UE security capabilities. V-AMF sends a Namf_Communicaiton_UEContextTransfer Request message to the home access mobility management function H-AMF to request the user context information of the terminal UE; H-AMF returns V-AMF user context information, including the user permanent identifier SUPI; and The terminal UE performs a registration process for mobility update in a roaming scenario. The method according to claim 1, characterized in that Before the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the terminal UE has completed the attachment to the home 4G network. The home 4G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID in the home 4G network, sets the shared PLMN ID to the high priority PLMN, and establishes the protocol data Unit PDU session, the terminal UE is in CM-CONNETED state, The scenario in which the terminal UE moves from the home 4G or 5G network in a connected state to the visited 5G network is a scenario in which the terminal UE performs a mobility registration update in a non-N26 interface interoperable connection state from the home 4G network to which it has attached to the visited 5G network. Among them, the step of the V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on the acquired data signaling includes: The terminal UE moves from the home 4G network to the visited 5G network, triggering the mobility registration update process changed by the AMF; The V-AMF receives the initial UE information of the terminal UE sent by the base station of the visited 5G network, and the V-AMF obtains the PLMN ID in the user location information carried in the initial UE information; The terminal UE initiates a registration request to the V-AMF through the V-NG-Ran visited network base station. The registration request carries 5G-GUTI, registration type, and UE security capabilities. Since the N26 interface is not configured between the V-AMF and the home network H-MME, the V-AMF sends an Identity Request message to the terminal UE to request the subscription hidden identifier SUCI; The UE returns the SUCI to the V-AMF via the Identity response message; and The terminal UE performs a registration process for mobility update in a roaming scenario. The method according to claim 1, characterized in that Before the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, the terminal UE has completed registration with the home 5G network. The home 5G network sets the shared PLMN ID of the visited 5G network to the EPLMN of the current PLMN ID under the home 5G network, sets the shared PLMN ID to a high-priority PLMN, and establishes a protocol data unit PDU session. The terminal UE is in the CM-CONNETED state. The scenario in which the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state is a scenario in which the terminal UE switches from the home network 5G to the visited 5G network, wherein the step of the V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on the acquired data signaling includes: The handover process from the home 5G network to the visited 5G network includes: In this handover process, H-AMF sends the context creation of the terminal UE to V-AMF. Request Namf_Communication_CreateUEContext Request, H-AMF and V-AMF exchange the UE context of the terminal UE, which carries UE context information. The UE context information includes the user permanent identifier SUPI of the terminal UE, the mobile context list, the session context list, and the N2 SM information including the Target ID. The method according to claim 3 or 4, characterized in that In a scenario where a terminal UE moves from its home 4G or 5G network to a visited 5G network in a connected state, in the step of determining whether the terminal UE is a roaming user based on acquired data signaling by the visited access mobility management function V-AMF of the visited 5G network, the data signaling acquired by the V-AMF is MCC+MNC, and the MCC+MNC of the terminal UE is acquired by the V-AMF from the 5G-GUTI in the Registration Request message in the mobility registration update process of the terminal UE, wherein the MCC+MNC constitutes a PLMN ID, a group of MCC+MNC identifies a network, and when the MCC+MNC is the home public land mobile network identifier HPLMN ID of the terminal UE, the terminal UE is a roaming user. The method according to claim 3, characterized in that In the scenario where the terminal UE moves from its home 4G or 5G network to a visited 5G network in a connected state, in the step of the visited access mobility management function V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on the acquired data signaling, the data signaling acquired by V-AMF is MCC+MNC, and the MCC+MNC of the terminal UE is acquired by V-AMF from the user permanent identifier SUPI of the terminal UE carried in the Namf_Communicaiton_UEContextTransfer Response message sent by H-AMF to V-AMF in the mobility registration update process, and when the MCC+MNC is the HPLMN ID of the terminal UE, the terminal UE is a roaming user. The method according to claim 3 or 4, characterized in that In a scenario where a terminal UE moves from a home 4G or 5G network to a visited 5G network in a connected state, in the step where a visited access mobility management function V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on the acquired data signaling, the data signaling acquired by the V-AMF is the PLMN ID in the tracking area identifier TAI, and the PLMN in the TAI The ID is obtained by V-AMF in the User Location Information in the Initial UE Message of the terminal UE in the mobility registration update process. The terminal UE sends it directly to the V-AMF through a NAS message. When the PLMN ID in the TAI is shared network number information, the terminal UE is a roaming user. The method according to claim 5, characterized in that In the scenario where the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state, in the step of the visited access mobility management function V-AMF of the visited 5G network determining whether the terminal UE is a roaming user based on the acquired data signaling, the data signaling acquired by the V-AMF is the PLMN ID in the tracking area identifier TAI, and the PLMN ID in the TAI is obtained by the V-AMF from the Target ID in the UE context creation request Namf_Communicaiton_CreateUEContext Request message sent by the H-AMF in the switching process. When the PLMN ID in the TAI is shared network number information, the terminal UE is a roaming user. The method according to claim 5, characterized in that In the scenario where the terminal UE moves from its home 4G or 5G network to a visited 5G network in a connected state, in the step where the visited access mobility management function V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on the acquired data signaling, the MCC+MNC of the terminal UE is obtained by V-AMF from the user permanent identifier SUPI of the terminal UE carried in the terminal UE context creation request Namf_Communicaiton_CreateUEContext Request message sent by H-AMF to V-AMF in the switching process. When the MCC+MNC is the HPLMN ID of the terminal UE, the terminal UE is a roaming user. The method according to any one of claims 1 to 5, characterized in that in the step of the terminal UE initiating a deregistration request to the visited 5G network, The terminal UE initiates a deregistration process to the visited 5G network to release the session and radio resources. The Deregistration type carried in the deregistration request is not supported by the UE capability. The terminal UE sets its shared PLMN to FPLMN, and the terminal UE that does not support VoNR will no longer access the visited 5G network. The method according to any one of claims 1 to 5, characterized in that In the step in which the V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on the acquired data signaling, the data signaling acquired by the V-AMF is the PLMN ID in the MCC+MNC or TAI. A system for prohibiting a terminal from accessing a network in a core network roaming scenario, characterized by comprising: A judgment module, which is configured to determine whether the terminal UE is a roaming user based on the acquired data signaling in a scenario where the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state; A sending module, which is configured to send a registration acceptance message to the terminal UE through the V-AMF after determining that the terminal UE is a roaming user, wherein the registration acceptance message carries extended 5GS network feature support information to indicate to the terminal UE whether the visited 5G network supports VoNR and VoLTE; and A receiving module is configured to receive information sent by the terminal UE after the terminal UE determines whether it meets the capabilities supported by the visited 5G network based on the received registration acceptance message, wherein the terminal UE determines whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration acceptance message, and after determining that the visited 5G network supports IMS-VoNR-3GPP but the terminal UE itself does not support VoNR, a deregistration request initiated by the terminal UE to the visited 5G network is received. A computer device, characterized in that it includes a memory and a processor, wherein a computer program is stored in the memory, and when the processor runs the computer program stored in the memory, the processor executes a method for prohibiting a terminal from accessing a network in a core network roaming scenario according to any one of claims 1 to 12. A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the processor executes a method for prohibiting a terminal from accessing a network in a core network roaming scenario according to any one of claims 1 to 12.