Method for prohibiting terminal from accessing network in core network roaming scenario

Abstract

The application provides a method, system, computer device and storage medium for prohibiting terminal access to a network in a core network roaming scenario, and relates to the technical field of communication. The method comprises the following steps: a V-AMF of a visited 5G network judges whether a terminal UE is a roaming user based on acquired data signaling; if the terminal UE is a roaming user, the V-AMF sends a registration acceptance message to the UE; the terminal UE judges whether the UE itself meets the supported capability of the visited 5G network according to the received registration acceptance message; and if the visited 5G network supports VoNR and the UE itself does not support VoNR, the UE initiates a deregistration request to the visited 5G network. The technical scheme provided by the application rejects the terminal which does not support VoNR to access the visited network in the scenario that the visited 5G network signal and the home 4G network signal exist simultaneously in the visited 5G network area in the core network roaming scenario, so that the roaming terminal accesses the home 4G network and initiates and uses voice service.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, 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

[0002] 5G inter-network roaming can accelerate the construction of 5G new infrastructure, promote network opening and sharing, reduce 5G network duplication, and achieve 5G network coverage and business development in an intensive and efficient manner to provide services for a wider user group. 5G inter-network roaming includes two technical implementation modes of core network roaming and access network sharing, wherein 5G core network roaming refers to that a complete 5G network (including a wireless network and a core network) is constructed by one operator, and users of other operators access the network through roaming, and business is provided through interworking of core networks of both parties to use mobile communication services. Under a 5G standalone network (SA) architecture, the core network roaming adopts a home routing mode defined by 3GPP (3rd Generation Partnership Project), that is, data of a roaming user returns to a home network, and user business is handled by the home network. In a network providing 5G core network roaming, data services, IMS-based voice / video services, and SMS over IP short message services should be provided to users.

[0003] Under the background of the core network roaming scenario, in a 5G shared area, that is, a visited network, there are the following scenarios: in the 5G shared area, there are 4G signals of a home network operator and shared 5G signals of a visited operator, and roaming users preferentially access the shared 5G of the visited operator. Between the 4G core network of the home network and the 5G core network of the roaming network, there is no N26 interface (an interface between a home network H-MME and a roaming network V-AMF), but an N14 interface (an interface between a home network H-AMF and a roaming network V-AMF) is opened. In the 5G shared area in the above scenario, between the 4G core network of the home network and the 5G core network of the roaming network, there is no N26 interface (an interface between a home network H-MME and a roaming network V-AMF), but an N14 interface (an interface between a home network H-AMF and a roaming network V-AMF) is opened. Since voice services in the shared area adopt VoNR (Voice over New Radio), EPS Fallback (falling back to a LTE network to provide voice by VoLTE) voice services are not supported, and therefore the network needs to open VoNR. However, when a terminal UE B of a home 5G network B that does not support VoNR voice services roams to a visited 5G network (a core network roaming area / 5G shared area) of an operator A, the terminal UE B cannot initiate voice services, which greatly affects user experience. SUMMARY

[0004] In order to at least partially solve the technical problem in the prior art that in the 5G sharing area, there are 4G signals of the home network operator and shared 5G signals of the visited operator at the same time, and roaming users preferentially access the shared 5G of the visited operator, resulting in that when the terminal UE of the home 5G network which does not support VoNR voice service roams to the visited 5G network (core network roaming area / 5G sharing area) of the visited operator, the terminal UE cannot initiate a voice service technical problem, the present application is completed.

[0005] According to an aspect of the present application, a method for prohibiting a terminal from accessing a network in a core network roaming scenario is provided, characterized in that it comprises:

[0006] Step S1, in the scenario that the terminal UE moves from the home 4G or 5G network in the connected state to the visited 5G network, the visited access mobility management function V-AMF of the visited 5G network judges whether the terminal UE is a roaming user based on the acquired data signaling;

[0007] Step S2, if 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;

[0008] Step S3, the terminal UE judges whether it meets the capabilities supported by the visited 5G network according to the received registration acceptance message, wherein the terminal UE judges whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration acceptance message; and

[0009] Step S4, if 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.

[0010] Optionally, when the V-AMF sends the terminal UE the registration accept message, the registration accept message carries the IMS-VoNR-3GPP and IMS-VoLTE-3GPP fields extended from the IMS-VoPS-3GPP and 0Spare fields in the extended 5GS network feature support information, and the IMS-VoNR-3GPP field is set to 1 and the IMS-VoLTE-3GPP field is set to 0, to indicate to the terminal UE that the visited 5G network supports VoNR but does not support VoLTE. When the terminal UE judges whether it meets the capabilities supported by the visited 5G network according to the received registration accept message, the terminal UE judges that the visited 5G network supports VoNR but does not support VoLTE by identifying the IMS-VoNR-3GPP field and the IMS-VoLTE-3GPP field in the 5GS network feature support information in the registration accept message.

[0011] Optionally, after 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 as the EPLMN of the current PLMN ID of the home 5G network, sets the shared PLMN ID as a high-priority PLMN, and establishes a PDU session, and the terminal UE is in a CM-CONNECTED 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 is redirected from the home 5G network to which registration has been completed to the visited 5G network in a connected state. The step S1 in which the V-AMF of the visited 5G network judges whether the terminal UE is a roaming user based on the acquired data signaling includes:

[0012] Step S1A1, the terminal UE moves from the home 5G network to the visited 5G network, triggering an AMF change mobility registration update procedure;

[0013] Step S1A2, the V-AMF receives the initial UE information of the terminal UE sent by the base station of the visited 5G network, and acquires the PLMN ID in the user location information carried in the information;

[0014] 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 the 5G-GUTI, the registration type, and the UE security capability;

[0015] Step S1A4, the V-AMF sends a Namf_Communicaiton_UEContextTransfer Request message to a home access mobility management function H-AMF to request user context information of the terminal UE;

[0016] Step S1A5, the H-AMF returns user context information of the V-AMF, including SUPI; and

[0017] Step S1A6, the terminal UE performs a registration procedure of mobility update in a roaming scenario.

[0018] Optionally, the terminal UE has completed attachment to a home 4G network, the home 4G network sets a shared PLMN ID of a visited 5G network as an EPLMN of a current PLMN ID of the home 4G network, sets the shared PLMN ID as a high priority PLMN, and establishes a PDU session, and the terminal UE is in a CM-CONNECTED state. The scenario that the terminal UE moves from the home 4G or 5G network in a connected state to the visited 5G network is a scenario of N26 interface non-interoperable connection state redirection of the terminal UE from the home 4G network having completed attachment to the visited 5G network. Step S1 of determining whether the terminal UE is a roaming user by the V-AMF of the visited 5G network based on acquired data signaling includes:

[0019] Step S1B1, the terminal UE moves from the home 4G network to the visited 5G network, triggering a mobility registration update procedure of AMF change;

[0020] Step S1B2, the V-AMF receives initial UE information of the terminal UE sent by a base station of the visited 5G network, and acquires a PLMN ID in user location information carried in the information;

[0021] Step S1B3, the terminal UE initiates a registration request to the V-AMF through a V-NG-Ran visited network base station, and the registration request carries a 5G-GUTI, a registration type, and UE security capability;

[0022] Step S1B4, since an N26 interface is not configured between the V-AMF and the H-MME, the V-AMF sends an IdentityRequest message to the terminal UE to request a subscription concealed identifier SUCI;

[0023] Step S1B5, the terminal UE returns the SUCI to the V-AMF through an Identity response message; and

[0024] Step S1B6, the terminal UE performs a registration procedure of mobility update in a roaming scenario.

[0025] Optionally, the terminal UE has completed the registration to the home 5G network, the home 5G network sets the shared PLMN ID of the visited 5G network as the EPLMN of the current PLMN ID under the home 5G network, sets the shared PLMN ID as a high priority PLMN, and establishes a PDU session, and the terminal UE is in a CM-CONNECTED state. The scenario that the terminal UE moves from the home 4G or 5G network to the visited 5G network in a connected state is a scenario of handover of the terminal UE from the home network 5G to the visited network 5G. The step S1 of determining whether the terminal UE is a roaming user based on the acquired data signaling by the V-AMF of the visited 5G network comprises:

[0026] The handover flow from the home 5G network to the visited 5G network, wherein in the handover flow, the H-AMF sends a context creation request Namf_Communication_CreateUEContext Request of the terminal UE to the V-AMF, and the UE context of the terminal UE is exchanged between the H-AMF and the V-AMF, the UE context carries UE context information, and the UE context information includes the SUPI of the terminal UE, a list of mobile contexts, a list of session contexts, and N2 SM information including a target ID.

[0027] Optionally, the data signaling acquired by the V-AMF is the PLMN ID in the tracking area identifier TAI, the PLMN ID in the tracking area identifier TAI is acquired by the V-AMF in the Initial UE Message of the terminal UE in the redirection flow, the terminal UE directly sends the V-AMF through the NAS message, and if the PLMN ID in the TAI is shared network information, the terminal UE is a roaming user.

[0028] Optionally, the data signaling acquired by the V-AMF is the PLMN ID in the tracking area identifier TAI, the PLMN ID in the tracking area identifier TAI is acquired by the V-AMF in the Target ID in the UE context creation request Namf_Communicaiton_CreateUEContext Request message sent by the H-AMF in the handover flow, and if the PLMN ID in the TAI is shared network information, the terminal UE is a roaming user.

[0029] Optionally, the MCC+MNC of the UE is obtained by the V-AMF from the SUPI of the terminal UE carried in the UE context creation request Namf_Communicaiton_CreateUEContext message sent by the H-AMF to the V-AMF in the handover process, and if the MCC+MNC is the HPLMN ID of the terminal UE, the UE is a roaming user.

[0030] Optionally, when the terminal UE initiates a deregistration request to the visited 5G network, the terminal UE initiates a deregistration procedure to the visited 5G network to release the session and the radio resource, the deregistration type carried in the deregistration request is UE capability not supported, the terminal UE sets the shared PLMN as the FPLMN, and the terminal UE not supporting VoNR no longer accesses the visited 5G network subsequently.

[0031] Optionally, in the step of judging whether the terminal UE is a roaming user based on the obtained data signaling by the V-AMF of the visited 5G network, the data signaling obtained by the V-AMF is the PLMN ID in the MCC+MNC or TAI.

[0032] According to another aspect of the present application, a system for prohibiting a terminal from accessing a network in a core network roaming scenario is provided, and the system comprises:

[0033] A judging module is configured to, in a scenario where a terminal UE moves from a home 4G or 5G network in a connected state to a visited 5G network, judge whether the terminal UE is a roaming user based on obtained data signaling by a visited access mobility management function V-AMF of the visited 5G network.

[0034] A sending module is configured to, if the terminal UE is a roaming user, send a registration accept message to the terminal UE by the V-AMF, wherein the registration accept message carries extended 5GS network feature support information for indicating whether the visited 5G network supports VoNR and VoLTE to the terminal UE; and

[0035] A receiving module is configured to, after the terminal UE judges whether the terminal UE meets the supported capability of the visited 5G network according to the received registration accept message, receive information initiated by the terminal UE, wherein the terminal UE judges whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration accept message, and if the visited 5G network supports IMS-VoNR-3GPP and the terminal UE itself does not support VoNR, receives a deregistration request initiated by the terminal UE to the visited 5G network.

[0036] According to still another aspect of the present application, there is provided a computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program stored in the memory, the processor executes the method for prohibiting a terminal from accessing a network in a core network roaming scenario.

[0037] According to still another aspect of the present application, there is provided a computer readable storage medium, which stores a computer program, and when the processor executes the computer program, the processor executes the method for prohibiting a terminal from accessing a network in a core network roaming scenario.

[0038] The technical solution provided by the present application can include the following beneficial effects:

[0039] The method for prohibiting a terminal from accessing a network in a core network roaming scenario provided by the present application can solve the problem that in the scenario where there exist both a visited 5G network signal and a home 4G network signal in the visited 5G network area in the core network roaming scenario, the terminal not supporting VoNR is refused to access the visited network, so that the roaming terminal accesses the home 4G network (the network), initiates and uses voice service, and the experience is not affected.

[0040] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by means of the structures particularly pointed out in the description and claims. BRIEF DESCRIPTION OF DRAWINGS

[0041] The accompanying drawings are included to provide a further understanding of the technical solution of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation on the technical solution of the present application.

[0042] Figure 1 A flowchart of a method for prohibiting a terminal from accessing a network in a core network roaming scenario provided by an embodiment of the present application is shown in the figure;

[0043] Figure 2 A flowchart of the step of determining whether a terminal UE is a roaming user in a specific scenario by the method provided by an embodiment of the present application is shown in the figure;

[0044] Figure 3 A flowchart of the step of determining whether a terminal UE is a roaming user in a specific scenario by the method provided by an embodiment of the present application is shown in the figure;

[0045] Figure 4 A flowchart of a step of judging whether a terminal UE is a roaming user in a specific scenario is provided for the method of the embodiments of the present application.

[0046] Figure 5 A structural diagram of a system for prohibiting a terminal from accessing a network in a core network roaming scenario is provided for the embodiments of the present application.

[0047] Figure 6 A structural diagram of a computer device is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the specific embodiments of the present application are described in detail below with reference to the drawings. It should be understood that the specific embodiments described herein are only used to explain and illustrate the present application, and are not used to limit the present application.

[0049] The embodiments of the present application provide a method for prohibiting a terminal from accessing a network in a core network roaming scenario.

[0050] Figure 1 A flowchart of a method for prohibiting a terminal from accessing a network in a core network roaming scenario is provided for the embodiments of the present application. The method comprises the following steps:

[0051] In step S1, in a scenario where a terminal UE moves from a home 4G or 5G network in a connected state to a visited 5G network, a V-AMF (Visited Access and Mobility Management Function) of the visited 5G network judges whether the terminal UE is a roaming user based on a PLMN ID obtained from data signaling.

[0052] In step S2, if 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 for indicating to the terminal UE whether the visited 5G network supports VoNR and VoLTE.

[0053] In step S3, the terminal UE judges whether itself meets the capabilities supported by the visited 5G network according to the received registration acceptance message, wherein the terminal UE judges whether the visited 5G network supports VoNR and VoLTE by identifying the 5GS network feature support information in the registration acceptance message; and

[0054] Step S4, if the visited 5G network supports IMS-VoNR-3GPP and the terminal UE does not support VoNR, the terminal UE initiates a deregistration request to the visited 5G network.

[0055] In some embodiments, the V-AMF sends the IMS-VoNR-3GPP and IMS-VoLTE-3GPP in the 5GS network feature support information in the registration accept message to the terminal UE (original protocol see 3GPP TS 24.501 9.11.3.5; Table 1 below). The IMS-VoNR-3GPP field is set to 1 and the IMS-VoLTE-3GPP field is set to 0 to indicate that the visited 5G network supports VoNR but does not support VoLTE. When the terminal UE determines whether it meets the capabilities supported by the visited 5G network according to the received registration accept message, the terminal UE determines that the visited 5G network supports VoNR but does not support VoLTE by identifying the IMS-VoNR-3GPP field and the IMS-VoLTE-3GPP field in the 5GS network feature support information in the registration accept message.

[0056]

[0057] Table 1

[0058]

[0059] Table 2

[0060] In the table shown in Table 2, the IMS-VoPS-3GPP at the 3rd byte and the 1st bit in the original protocol is modified to IMS-VoNR-3GPP: set to 0 indicates that the network does not support IMS voice over NR access for 3GPP access; and set to 1 indicates that the network supports IMS voice over NR access for 3GPP access. The IMS-VoLTE-3GPP is added at the 5th byte and the 8th bit of the spare reserved 0Spare: set to 0 indicates that the network does not support IMS voice over LTE access for 3GPP access; and set to 1 indicates that the network supports IMS voice over LTE access for 3GPP access. In the scenario of the present application, the V-AMF in the visited 5G network area carries the 5GS network feature support information in the registration accept message sent to the terminal UE, wherein the IMS-VoNR-3GPP is set to 1 and the IMS-VoLTE-3GPP is set to 0.

[0061] In some embodiments, in step S1, the acquired data signaling can be the PLMN ID in MCC (Mobile Country Code) + MNC (Mobile Network Code) or TAI (Tracking Area Identity).

[0062] In some embodiments, when the terminal UE initiates a deregistration request to the visited 5G network, the terminal UE can initiate a deregistration process to the visited 5G network to release the session and wireless resources.

[0063] In some embodiments, the de-registration type carried by the deregistration request can be set to "UE capability not supported". Specifically, the Deregistration type (see 3GPP TS 24.501 9.11.3.20 in the original protocol; Table Three below; see Table Four below in the extended protocol) in the extended deregistration request message:

[0064]

[0065] Table Three

[0066]

[0067] Table Four

[0068] In the tables shown in Table Three and Four, the UE capability not supported identifier is added in the spare reserved place at the 5th bit of the 1st byte: setting 0 indicates normal de-registration (same as setting 0 of the Switch off at the 4th bit of the 1st byte); and setting 1 indicates UE capability not supported.

[0069] In some embodiments, the terminal UE sets its shared PLMN as FPLMN (Forbidden PLMN), and the terminal UE which does not support VoNR will not access the visited 5G network in the future. Because the roaming area of the scene also has the signal of the home 4G network, the UE initiates a registration process to the home 4G network, accesses the home 4G network (the network), initiates and uses voice services, and the experience is not affected.

[0070] In some embodiments, the method of prohibiting a terminal from accessing a network in a core network roaming scenario can include scenarios in which a terminal UE moves from a home 4G or 5G network to a visited 5G network in a connected state (Scenarios A, B, C, etc. described below).

[0071] A. Connected mode redirection of a terminal UE from a home 5G network to a visited 5G network

[0072] Specifically, in some embodiments, the terminal UE has completed registration with a home 5G network, the home 5G network sets the shared PLMN ID of the visited 5G network as the EPLMN (Equivalent PLMN) of the current PLMN ID of the home 5G network, and sets the shared PLMN ID as a high-priority PLMN, and establishes a PDU session, and the terminal UE is in a CM-CONNECTED 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 is redirected from the registered home 5G network to the visited 5G network in a connected state. In this scenario, as shown in FIG. 1A, step S1 can include: Figure 2

[0073] Step S1A1, the terminal UE moves from the home 5G network to the visited 5G network, triggering an AMF change mobility registration update procedure;

[0074] Step S1A2, 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 (for example, the PLMN ID in the TAI) in the user location information carried in the information;

[0075] Step S1A3, the terminal UE initiates a registration request to the V-AMF through the V-NG-Ran base station of the visited network, and the registration request carries the 5G-GUTI (5G Globally Unique Temporary Identifier 5G Global Unique Temporary Identifier), the registration type, and the UE security capability;

[0076] Step S1A4, the V-AMF sends a Namf_Communicaiton_UEContextTransfer Request message to the home access mobility management function H-AMF to request to obtain the user context information of the terminal UE;

[0077] Step S1A5, the H-AMF returns the user context information of the V-AMF, including the SUPI (Subscription Permanent Identifier user permanent identifier); and

[0078] Step S1A6, the terminal UE performs a registration procedure of mobility update in a roaming scenario.​

[0079] In some embodiments, the user context information can further include MM Context List, SessionContext List (PDU Session IDs, S-NSSAI(s), DNN, hsmfId, vsmfId), UE RadioCapability.

[0080] B. Connected mode redirection of a terminal UE from a home 4G network to a visited 5G network without N26 interface interworking

[0081] Specifically, in some embodiments, 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 as the EPLMN of the current PLMN ID under the home 4G network, sets the shared PLMN ID as a high priority PLMN, and establishes a PDU session, and the terminal UE is in a CM-CONNECTED 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 the scenario of the terminal UE moving from the home 4G network with completed attachment to the visited 5G network in a connected state without N26 interface interworking. In this scenario, as shown in FIG. 1, step S1 can include: Figure 3

[0082] Step S1B1, the terminal UE moves from the home 4G network to the visited 5G network, triggering the mobility registration update procedure of AMF change;

[0083] 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 (for example, the PLMN ID in the TAI) in the user location information carried in the information;

[0084] 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 the 5G-GUTI, the registration type, and the UE security capability;

[0085] Step S1B4, since the N26 interface is not configured between the V-AMF and the H-MME, the V-AMF issues an IdentityRequest message to the terminal UE to request to obtain the SUCI (Subscription Concealed Identifier);

[0086] Step S1B5, the terminal UE returns the SUCI to the V-AMF through the Identity response message; and

[0087] ​Step S1B6, the terminal UE performs a registration procedure of mobility update in a roaming scenario.

[0088] C. Handover of a terminal UE from a home 5G network to a visited 5G network

[0089] Specifically, in some embodiments, the terminal UE has completed registration to the home 5G network, the home 5G network sets the shared PLMN ID of the visited 5G network as the EPLMN of the current PLMN ID under the home 5G network, sets the shared PLMN ID as a high priority PLMN, and establishes a PDU session, and the terminal UE is in a CM-CONNECTED 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 the scenario of handover of the terminal UE from the home network 5G to the visited network 5G. In this scenario, step S1 includes:

[0090] Handover procedure from the home 5G network to the visited 5G network. In this handover procedure, the H-AMF sends a context creation request Namf_Communication_CreateUEContext Request of the terminal UE to the V-AMF, and the H-AMF and the V-AMF exchange the UE context of the terminal UE, which carries UE context information including the SUPI of the terminal UE, a mobility context list, a session context list, and N2 SM information including the Target ID.

[0091] In some embodiments, in this scenario, as shown in Figure 4 Step S1 can include:

[0092] Step S1C1, the home 5G network RAN sends a handover requirement Handover Required to the H-AMF, which carries the Target ID of the target base station;

[0093] Step S1C2, the H-AMF selects the V-AMF according to the Target ID;

[0094] Step S1C3, the H-AMF sends a context creation request Namf_Communication_CreateUEContext Request of the terminal UE to the V-AMF, and the H-AMF and the V-AMF exchange the UE context of the terminal UE, which carries UE context information including the SUPI of the terminal UE, a mobility context list, a session context list, and N2 SM information including the Target ID.

[0095] Step S1C4, session creation in a roaming scenario is performed;

[0096] Step S1C5, the V-AMF sends a Handover Request to the RAN of the visited 5G network, and determines the radio base station of the visited 5G network according to the Target ID, and allocates a 5G-GUTI for the terminal UE;

[0097] Step S1C6, the RAN of the visited network sends a Handover Request Acknowledge to the V-AMF, wherein a list of PDU sessions that need to be switched and N2 SM information are carried;

[0098] Step S1C7, a session update process in a roaming scenario is performed, and an indirect forwarding tunnel is established;

[0099] Step S1C8, the V-AMF sends a UE Context Create Response message to the H-AMF, so as to send N2 SM information containing downlink data tunnel information to the H-AMF;

[0100] Step S1C9, the H-AMF sends a Handover Command to the RAN of the home 5G network;

[0101] Step S1C10, the RAN of the home 5G network sends a Handover Command to the terminal UE, and an indirect forwarding tunnel of downlink user plane data is established;

[0102] Step S1C11, the terminal UE sends a Handover Confirm to the RAN of the visited 5G network, and the terminal UE completes the switching, and uplink user plane tunnels of the terminal UE to the V-UPF and the H-UPF are punched through;

[0103] Step S1C12, the RAN of the visited 5G network sends a Handover Notify to the V-AMF, and the RAN of the visited 5G network completes the switching;

[0104] Step S1C13, the V-AMF sends a Namf_Communication_N2InfoNotify to the H-AMF, so as to notify the H-AMF that the N2 interface switching is completed;

[0105] Step S1C14, the H-AMF sends a Namf_Communication_N2InfoNotify Ack to the V-AMF;

[0106] Step S1C15, a session update process in a roaming scenario is performed, and a downlink user plane tunnel is punched through; and

[0107] Step S1C16, a registration process of a mobility registration update type is performed.

[0108] In some embodiments, such as in scenario A and scenario B, the data signaling acquired by the V-AMF is MCC+MNC, which is acquired by the V-AMF in the 5G-GUTI in the Registration Request message in the redirection (home 4G network to visited 5G network and home 5G network to visited 5G network) procedure of the terminal UE, wherein the MCC+MNC constitutes a PLMN ID, a group of MCC+MNC identifies a network, and if the MCC+MNC terminal is the HPLMN ID (Home Public Land Mobile Network ID) of the UE, the terminal UE is a roaming user.

[0109] In some embodiments, such as in scenario A, the data signaling acquired by the V-AMF is MCC+MNC, which is acquired by the V-AMF in the SUPI carried in the Namf_Communicaiton_UEContextTransfer Response message sent by the H-AMF to the V-AMF in the redirection (home 5G network to visited 5G network) procedure of the terminal UE, and if the MCC+MNC is the HPLMN ID of the terminal UE, the terminal UE is a roaming user.

[0110] In some embodiments, such as in scenario C, the MCC+MNC of the UE is acquired by the V-AMF in the SUPI carried in the Namf_Communicaiton_CreateUEContext Request message sent by the H-AMF to the V-AMF in the handover procedure of the terminal UE, and if the MCC+MNC is the HPLMN ID of the terminal UE, the UE is a roaming user.

[0111] In some embodiments, such as in scenario A and scenario B, the data signaling acquired by the V-AMF is the PLMN ID in the TAI, which is acquired by the V-AMF in the User Location Information in the Initial UE Message of the terminal UE in the redirection (home 4G network to visited 5G network and home 5G network to visited 5G network) procedure, and the terminal UE directly sends the V-AMF through the NAS message, and if the PLMN ID in the TAI is the shared network number information, the terminal UE is a roaming user.

[0112] In some embodiments, for example in scenario C, the data signaling acquired by the V-AMF is the PLMN ID in the tracking area identity (TAI), which is acquired by the V-AMF in the Target ID in the UE context creation request (Namf_Communicaiton_CreateUEContext Request) message sent by the H-AMF in the handover process, and if the PLMN ID in the TAI is the shared network number information, the terminal UE is a roaming user.

[0113] Based on the same technical concept, the embodiment of the present application correspondingly further provides a system for prohibiting a terminal from accessing a network in a core network roaming scenario, as shown in the accompanying drawings. Figure 5 The system 5 comprises a judging module 51, a sending module 52, and a receiving module 53.

[0114] The judging module 51 is configured to, in a scenario where a terminal UE moves from a home 4G or 5G network in a connected state to a visited 5G network, judge whether the terminal UE is a roaming user based on acquired data by a visited access mobility management function (V-AMF) of the visited 5G network.

[0115] The sending module 52 is configured to, if the terminal UE is a roaming user, send a registration accept message to the terminal UE by the V-AMF. The registration accept message carries extended 5GS network feature support information, which is used to indicate whether the visited 5G network supports VoNR and VoLTE for the terminal UE.

[0116] The receiving module 53 is configured to receive information sent by the terminal UE after the terminal UE judges whether its own capability meets the capability supported by the visited 5G network according to the received registration accept message. By identifying the 5GS network feature support information in the registration accept message, the terminal UE judges whether the visited 5G network supports VoNR and VoLTE, and if the visited 5G network supports IMS-VoNR-3GPP and the terminal UE itself does not support VoNR, the receiving module 53 receives a deregistration request initiated by the terminal UE to the visited 5G network.

[0117] Based on the same technical concept, the embodiment of the present application correspondingly further provides a computer device, as shown in the accompanying drawings. Figure 6 The computer device 6 comprises a memory 61 and a processor 62, and 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 for prohibiting a terminal from accessing a network in a core network roaming scenario.

[0118] Based on the same technical concept, the embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor, and the processor executes the method for prohibiting a terminal from accessing a network in a core network roaming scenario.

[0119] 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 embodiment of the present application can achieve the following effects: 1. The V-AMF determines whether the UE is a roaming user according to a signaling policy; 2. The IMS-VoLTE-3GPP and IMS-VoNR-3GPP identification information newly added in the 5GS network feature support 5G network supported function table in the Registration Accept message is used to mark and distinguish 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) in the 5GS network feature support in the Registration Accept message and according to its own capability; and 4. The mobility signaling interaction process of the terminal not supporting VoNR accessing the visited 5G network in the roaming scenario is defined.

[0120] Those skilled in the art can understand that all or some of the steps in the method disclosed above, the functional modules / units in the system and the device can be implemented as software, firmware, hardware and appropriate combinations thereof. In the hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component can have multiple functions, or one function or step can be performed by several physical components in cooperation. Some or all of the 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 an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those skilled 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 storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as known to those skilled in the art, communication media typically includes computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism, and can include any information delivery medium.

[0121] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for prohibiting a terminal from accessing a network in a core network roaming scenario, characterized in that, The method comprises the following steps: In a scenario where a terminal UE moves from a home 4G or 5G network in a connected state to a visited 5G network, a visited access mobility management function V-AMF of the visited 5G network determines whether the terminal UE is a roaming user based on acquired data signaling; If 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 for indicating to the terminal UE whether the visited 5G network supports VoNR and VoLTE; The terminal UE determines whether the terminal UE itself meets the supported capability of 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 If 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 and sets the shared PLMN of the terminal UE as an FPLMN, and the terminal UE will no longer access the visited 5G network in the future.

2. The method of claim 1, wherein When the V-AMF sends the registration acceptance message to the terminal UE, the registration acceptance message carries extended 5GS network feature support information, wherein the IMS-VoPS-3GPP and 0Spare fields in the extended 5GS network feature support information are extended as IMS-VoNR-3GPP and IMS-VoLTE-3GPP, and the identification indication of the IMS-VoNR-3GPP field is set as 1 and the identification indication of the IMS-VoLTE-3GPP field is set as 0, for indicating to the terminal UE that the visited 5G network supports VoNR but does not support VoLTE; And When the terminal UE determines whether the terminal UE itself meets the supported capability of the visited 5G network according to the received registration acceptance message, the terminal UE determines that the visited 5G network supports VoNR but does not support VoLTE by identifying the identification indication of the IMS-VoNR-3GPP field and the IMS-VoLTE-3GPP field in the 5GS network feature support information in the registration acceptance message.

3. The method of claim 1, wherein The terminal UE has completed registration to a home 5G network, the home 5G network sets a shared PLMN ID of a visited 5G network as an EPLMN of a current PLMN ID of the home 5G network, sets the shared PLMN ID as a high-priority PLMN, and establishes a PDU session, and the terminal UE is in a CM-CONNECTED state, The scenario where the terminal UE moves from the home 4G or 5G network in the connected state to the visited 5G network is a scenario of connection state redirection of the terminal UE from the registered home 5G network to the visited 5G network, The step of the V-AMF visiting the 5G network to determine whether the terminal UE is a roaming user based on the acquired data signaling includes: When the terminal UE moves from the home 5G network to the visited 5G network, it triggers the AMF change mobility registration update process; The V-AMF receives the initial UE information of the terminal UE sent by the base station visiting the 5G network, and obtains the PLMN ID from the user location information carried in the information. The terminal UE initiates a registration request to the V-AMF via V-NG-Ran to visit the network base station. The registration request carries 5G-GUTI, registration type, and UE security capabilities. V-AMF sends a Namf_Communication_UEContextTransferRequest 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 SUPI; and The terminal UE executes the registration process for mobility updates in roaming scenarios.

4. The method according to claim 1, characterized in that, The UE has completed attaching 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 under the home 4G network, sets the shared PLMN ID to a high-priority PLMN, and establishes a PDU session. The UE is now in the CM-CONNETED state. The scenario where the terminal UE moves from its home 4G or 5G network to the visited 5G network while in a connected state refers to a scenario where the terminal UE is redirected from its attached home 4G network to the visited 5G network in a connected state without N26 interface interoperability. The step of the V-AMF visiting the 5G network to determine whether the terminal UE is a roaming user based on the acquired data signaling includes: When the terminal UE moves from the home 4G network to the visited 5G network, it triggers the AMF change mobility registration update process; The V-AMF receives the initial UE information of the terminal UE sent by the base station visiting the 5G network, and obtains the PLMN ID from the user location information carried in the information. The terminal UE initiates a registration request to the V-AMF via V-NG-Ran to visit the network base station. The registration request carries 5G-GUTI, registration type, and UE security capabilities. Since the N26 interface is not configured between V-AMF and H-MME, V-AMF sends an Identity Request message to the terminal UE to request the acquisition of the Subscription Hidden Identifier (SUCI). The terminal UE returns a SUCI to the V-AMF via an Identity Response message; and The terminal UE executes the registration process for mobility updates in roaming scenarios.

5. The method according to claim 1, characterized in that, The UE has completed registration with its 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 PDU session. The UE is now in the CM-CONNETED state. The scenario where the terminal UE moves from its home 4G or 5G network to the visited 5G network while in a connected state is a scenario of the terminal UE switching from its home 5G network to the visited 5G network. The step of the V-AMF visiting the 5G network to determine whether the terminal UE is a roaming user based on the acquired data signaling includes: The handover process from home 5G network to visited 5G network, among which... In this handover procedure, the H-AMF sends a Namf_Communication_CreateUEContext Request to the V-AMF to request the UE's context. The H-AMF and V-AMF exchange the UE context of the UE. This UE context carries UE context information, including the UE's SUPI, mobile context list, session context list, and N2 SM information including the Target ID.

6. The method according to claim 3 or 4, characterized in that, The data signaling obtained by V-AMF is MCC+MNC. The MCC+MNC of the terminal UE is obtained by V-AMF from the 5G-GUTI in the Registration Request message during the terminal UE's redirection procedure. MCC+MNC forms PLMNID. A group of MCC+MNCs identifies a network. If the terminal with the MCC+MNC is the UE's Home Public Land Mobile Network ID (HPLMN ID), then the terminal UE is a roaming user.

7. The method according to claim 3, characterized in that, The data signaling obtained by V-AMF is MCC+MNC. 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 Namf_Communication_UEContextTransfer Response message sent by H-AMF to V-AMF during the redirection procedure. If the MCC+MNC is the HPLMN ID of the terminal UE, then the terminal UE is a roaming user.

8. The method according to claim 3 or 4, characterized in that, The data signaling obtained by V-AMF is the PLMN ID in the Tracking Area Identifier (TAI). The PLMN ID in the TAI is obtained by V-AMF from the User Location Information in the Initial UE Message of the terminal UE during the redirection procedure. The terminal UE sends it directly to V-AMF through the NAS message. If the PLMN ID in the TAI is a shared network number, then the terminal UE is a roaming user.

9. The method according to claim 5, characterized in that, The data signaling obtained by V-AMF is the PLMN ID in the Tracking Area Identifier (TAI). The PLMN ID in the TAI is obtained by V-AMF from the Target ID in the UE Context Creation Request (Namf_Communication_CreateUEContextRequest) message sent by H-AMF during the handover procedure. If the PLMN ID in the TAI is a shared network number, then the terminal UE is a roaming user.

10. The method according to claim 5, characterized in that, The UE's MCC+MNC is obtained from the UE's SUPI carried in the Namf_Communication_CreateUEContext Request message sent by H-AMF to V-AMF during the handover procedure. If the MCC+MNC is the UE's HPLMN ID, then the UE is a roaming user.

11. The method according to any one of claims 1 to 5, characterized in that, When the terminal UE initiates a deregistration request to the visited 5G network The terminal UE initiates a deregistration process with the visited 5G network to release the session and radio resources. The registration request carries a Deregistration type indicating that the UE capability is not supported. The terminal UE sets its own shared PLMN to FPLMN, and the terminal UE that does not support VoNR will no longer access the visited 5G network.

12. The method according to any one of claims 1 to 5, characterized in that, In the step of the V-AMF visiting the 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 MCC+MNC or TAI.

13. A system for prohibiting a terminal from accessing a network in a core network roaming scenario, the system comprising: include: The judgment module is configured to determine whether the terminal UE is a roaming user based on the acquired data signaling when the terminal UE moves from the home 4G or 5G network in a connected state to the visited 5G network. The sending module is configured to send a registration acceptance message to the terminal UE if the terminal UE is a roaming user. This 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 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. Specifically, by identifying the 5GSnetwork 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 but the terminal UE itself does not support VoNR, the module receives a deregistration request initiated by the terminal UE to the visited 5G network. When the terminal UE initiates a deregistration request to the visited 5G network, the terminal UE sets its shared PLMN to FPLMN and will not access the visited 5G network again.

14. A computer device, comprising: The device includes a memory and a processor. The memory stores a computer program. When the processor runs the computer program stored in the memory, the processor executes a method for prohibiting terminal access to the network in a core network roaming scenario according to any one of claims 1 to 12.

15. A computer readable storage medium having stored thereon a computer program, characterized in that, When the computer program is executed by the processor, the processor executes the method for prohibiting terminal access to the network in a core network roaming scenario according to any one of claims 1 to 12.

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