CN115915093B

CN115915093B - EPLMN list setting method, core network equipment and medium

Info

Publication number: CN115915093B
Application number: CN202211354202.7A
Authority: CN
Inventors: 师瑜; 周晶; 丁志东
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2024-06-25
Anticipated expiration: 2042-11-01
Also published as: CN115915093A; WO2024093844A1

Abstract

The invention provides a setting method of an EPLMN list, core network equipment and a medium, wherein the method comprises the following steps: acquiring capability information of a terminal and capability information of a visiting network; judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network; if the terminal satisfies the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent, the roaming PLMN of the visiting network or the home PLMN of the home network is carried in the EPLMN list and is sent to the terminal, the method, the core network equipment and the medium can solve the problem that the traditional setting method of the EPLMN list cannot set the capability information of the terminal and the visiting network in a distinguishing way, voice service cannot be used after the terminal moves to the visiting network easily, or when voice service cannot be used under the visiting network by the terminal, the situation that the home network cannot be actively returned is solved, and user experience is seriously influenced.

Description

EPLMN list setting method, core network equipment and medium

Technical Field

The present invention relates to the field of network technologies, and in particular, to a method for setting an EPLMN list, a core network device, and a medium.

Background

The 5G core network roaming refers to that under the independent networking (SA) mode, a home network side 5G user uses 5G service in a 5G roaming area by accessing a visiting network side 5G network.

However, in the roaming scenario of the 5G core network, since the existing EPLMN list setting method cannot set the capability information of the terminal and the visited network differently, the terminal is easy to be moved to the visited network and cannot use voice service, or when the terminal cannot use voice service under the visited network, the terminal cannot actively return to the home network, which seriously affects user experience.

Disclosure of Invention

The invention aims to solve the technical problems that aiming at the defects in the prior art, a setting method of an EPLMN list, core network equipment and a medium are provided, so that the problems that the traditional setting method of the EPLMN list cannot issue the EPLMN list differently aiming at capability information of a terminal and a visiting network, voice service cannot be used after the terminal moves to the visiting network or the terminal cannot actively return to a home network when voice service cannot be used under the visiting network are solved, and user experience is seriously affected.

In a first aspect, the present invention provides a method for setting an EPLMN list, applied to a core network device, where the method includes:

acquiring capability information of a terminal and capability information of a visiting network;

judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network;

And if the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent, carrying the roaming PLMN of the visiting network or the home PLMN of the home network in an EPLMN list and sending the roaming PLMN or the home PLMN of the home network to the terminal.

Further, before the acquiring the capability information of the terminal, the method further includes:

Receiving an attachment request/registration request of the terminal, and acquiring registration information of the terminal from the attachment request/registration request of the terminal;

judging whether the terminal meets the roaming condition of the core network according to the registration information;

the acquiring the capability information of the terminal and the capability information of the visiting network specifically comprises the following steps:

and if the terminal meets the roaming condition of the core network, acquiring the capability information of the terminal and the capability information of the visiting network.

Further, the registration information includes: the position information of the terminal and/or the international mobile subscriber identity IMSI and/or the international mobile equipment identity IMEI and/or the international mobile subscriber integrated services digital network MSISDN;

the judging whether the terminal meets the roaming condition of the core network according to the registration information specifically comprises the following steps:

Judging whether the terminal meets the roaming condition of the core network according to the position information, and/or IMSI, and/or IMEI, and/or MSISDN of the terminal.

Further, the acquiring the capability information of the terminal specifically includes:

And acquiring the new air interface voice VoNR capability and/or the evolved packet circuit (EPS FB) capability of the terminal.

Further, acquiring VoNR capabilities of the terminal specifically includes:

transmitting a first request message to a wireless network device, wherein the first request message is used for requesting to acquire VoNR capabilities of the terminal;

Receiving a first response message sent by the wireless network device based on the first request message, wherein the first response message carries VoNR capability fields;

And acquiring VoNR capability of the terminal according to the value of the VoNR capability field, wherein if the value of the VoNR capability field is supported, the terminal is VoNR capable and is in an on state, and if the value of the VoNR capability field is not supported, the terminal is not VoNR capable or VoNR capable but the VoNR capability is in an off state.

Further, the sending the first request message to the wireless network device specifically includes:

Transmitting a user terminal equipment (UE) wireless capability matching request message or a UE wireless capability checking request message to the wireless network equipment;

the receiving the first response message sent by the wireless network device based on the first request message specifically includes:

Receiving a UE wireless capability matching response message sent by the wireless network device based on the UE wireless capability matching request message; or alternatively

And receiving a UE wireless capability check response message sent by the wireless network equipment based on the UE wireless capability check request message.

Further, acquiring VoNR capabilities of the terminal specifically includes:

Receiving a UE wireless capability information indication message sent by wireless network equipment;

And analyzing the UE wireless capability information indication message to acquire VoNR capability of the terminal.

Further, the determining, according to the capability information of the terminal and the capability information of the visited network, whether the terminal meets a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent specifically includes:

and judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to VoNR capability and/or EPS FB capability of the terminal, and VoNR capability and EPS FB capability of the visiting network.

Further, the determining, according to VoNR capabilities and/or EPS FB capabilities of the terminal and VoNR capabilities and EPS FB capabilities of the visited network, whether the terminal meets a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent specifically includes at least one of the following:

if the visited network supports VoNR capabilities and EPS FB capabilities, and the terminal supports at least one of VoNR capabilities and EPS FB capabilities, determining that the terminal satisfies a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent;

If the visited network supports VoNR capabilities and supports EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities and is a non-voice terminal, judging that the terminal meets the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

If the visited network supports VoNR capabilities but does not support EPS FB capabilities, the terminal supports VoNR capabilities, determining that the terminal satisfies a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent;

If the visited network supports VoNR capabilities but does not support EPS FB capabilities, the terminal does not support VoNR capabilities but supports EPS FB capabilities, determining that the terminal does not meet a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent;

If the visited network supports VoNR capabilities but does not support EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities and is a non-voice terminal, judging that the terminal meets the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

If the visited network does not support VoNR capabilities but supports EPS FB capabilities, the terminal supports EPS FB capabilities, judging that the terminal meets the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

If the visited network does not support VoNR capabilities but supports EPS FB capabilities, the terminal supports VoNR capabilities but does not support EPS FB capabilities, judging that the terminal does not meet the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

if the visited network does not support VoNR capabilities but supports EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities and is a non-voice terminal, judging that the terminal meets the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

If the visited network does not support VoNR capability or EPS FB capability, and the terminal supports at least one of VoNR capability and EPS FB capability, judging that the terminal does not meet the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

If the visited network does not support VoNR capabilities and does not support EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities and is a non-voice terminal, judging that the terminal meets the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent.

Further, acquiring VoNR capabilities of the terminal specifically includes:

receiving a tracking area update message or a mobile registration update message sent by a terminal, wherein the tracking area update message or the mobile registration update message carries VoNR capacity of the terminal;

and acquiring VoNR capability of the terminal from the tracking area update message or the mobile registration update message.

Further, the method for sending the roaming PLMN of the visited network or the home PLMN of the home network in the EPLMN list to the terminal specifically includes:

If the core network equipment is home network core network equipment, carrying a roaming PLMN of the visiting network in an EPLMN list and sending the roaming PLMN to the terminal;

And if the core network equipment is visited network core network equipment, carrying the home PLMN of the home network in an EPLMN list and sending the home PLMN to the terminal.

sending an EPLMN list carrying a roaming PLMN of the visited network or a home PLMN of a home network to the terminal through an attach accept message/registration accept message; or alternatively

And sending an EPLMN list carrying the roaming PLMN of the visiting network or the home PLMN of the home network to the terminal through a tracking area update accept message/a mobile registration update accept message.

Further, the method further comprises:

If the core network device is home network core network device and the terminal does not meet the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent, the EPLMN list is not sent to the terminal, or the EPLMN list which does not carry the roaming PLMN of the visited network is sent to the terminal.

Further, the method further comprises:

If the core network device is a visited network core network device and the terminal does not meet the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent, rejecting the access of the terminal, and sending an attach failure message/registration failure message carrying a reject cause value to the terminal, or sending a tracking area update failure message/mobile registration update failure message carrying a reject cause value to the terminal.

In a second aspect, the present invention provides a core network device, including:

the capability acquisition module is used for acquiring capability information of the terminal and capability information of the visiting network;

The condition judging module is connected with the capability acquiring module and is used for judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network;

And the list issuing processing module is connected with the condition judging module and is used for carrying the roaming PLMN of the visiting network or the home PLMN of the home network in the EPLMN list and sending the EPLMN list to the terminal if the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent.

In a third aspect, the present invention provides a core network device comprising a memory and a processor, the memory storing a computer program, the processor being arranged to run the computer program to implement the method of setting an EPLMN list as described in the first aspect above.

In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method for setting an EPLMN list according to the first aspect.

The invention provides a setting method of an EPLMN list, core network equipment and a medium, which firstly acquire capability information of a terminal and capability information of a visiting network; then judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network; and if the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent, carrying the roaming PLMN of the visiting network or the home PLMN of the home network in an EPLMN list and sending the roaming PLMN or the home PLMN of the home network to the terminal. The invention can issue EPLMN list differently according to the capability information of terminal and visiting network, so it can ensure that when terminal can not use visiting network voice service, it can not use reselecting or redirecting roaming to visiting network, and can reduce frequent network selecting operation of terminal, or can ensure terminal can not use voice service under visiting network, and can actively return to home network, solving the problem that current EPLMN list setting method can not set differently for terminal and visiting network capability information, which can easily result in terminal unable to use voice service after moving to visiting network, or terminal unable to actively return to home network when terminal unable to use voice service under visiting network, seriously affecting user experience.

Drawings

Fig. 1 is a schematic diagram of a roaming architecture of a core network in a home network signal scenario according to an embodiment of the present invention;

fig. 2 is a flowchart of a method for setting an EPLMN list in embodiment 1 of the present invention;

fig. 3 is a schematic structural diagram of a core network device according to embodiment 2 of the present invention;

fig. 4 is a schematic structural diagram of a core network device according to embodiment 3 of the present invention.

Detailed Description

In order to make the technical scheme of the present invention better understood by those skilled in the art, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.

It is to be understood that the specific embodiments and figures described herein are merely illustrative of the invention, and are not limiting of the invention.

It is to be understood that the various embodiments of the invention and the features of the embodiments may be combined with each other without conflict.

It is to be understood that only the portions relevant to the present invention are shown in the drawings for convenience of description, and the portions irrelevant to the present invention are not shown in the drawings.

It should be understood that each unit and module in the embodiments of the present invention may correspond to only one physical structure, may be formed by a plurality of physical structures, or may be integrated into one physical structure.

It will be appreciated that, without conflict, the functions and steps noted in the flowcharts and block diagrams of the present invention may occur out of the order noted in the figures.

It is to be understood that the flowcharts and block diagrams of the present invention illustrate the architecture, functionality, and operation of possible implementations of systems, apparatuses, devices, methods according to various embodiments of the present invention. Where each block in the flowchart or block diagrams may represent a unit, module, segment, code, or the like, which comprises executable instructions for implementing the specified functions. Moreover, each block or combination of blocks in the block diagrams and flowchart illustrations can be implemented by hardware-based systems that perform the specified functions, or by combinations of hardware and computer instructions.

It should be understood that the units and modules related in the embodiments of the present invention may be implemented by software, or may be implemented by hardware, for example, the units and modules may be located in a processor.

Summary of the application

In recent years, the development of 5G technology is rapid, however, the deployment investment cost of the 5G network is high, and the development speed of the 5G network is greatly restricted, so that the 5G shared network technology is also attracting more attention as a network cost optimization mode, and the 5G co-building shared network is divided into two network architectures, namely 5G access network sharing and 5G core network roaming. The 5G core network roaming refers to that under an independent networking (SA) mode, a home network side 5G user uses a 5G service in a 5G roaming area by accessing to a visited network side 5G network. 5G access networks and core networks of both sides of the 5G core network roaming operators are independently constructed and managed, and users are independently managed. The main stream 5G core network roaming is realized by adopting a home route mode, namely roaming user data returns to a home network, and the service is provided by the home network. In the network providing 5G core network roaming, data service, voice/video service based on IMS (IP Multimedia Subsystem ) and SMS over IP short message service should be provided to the user, and both operators providing 5G core network roaming service should provide corresponding services to the roaming user based on the internet roaming protocol.

Currently, the network architecture of 5G core network roaming can be classified into core network roaming in a "home network signal" scenario and core network roaming in a "no home network signal" scenario according to the scenario. The 3GPP defined core network roaming mainly refers to an international roaming scenario, that is, when no home network signal is available, the terminal can access using a visited network 5G service, there are no N26 interface and N14 interface between the 4G/5G core network of the home network and the 5G core network of the roaming network, the N26 interface is an interface between the home network MME (Mobility MANAGEMENT ENTITY ) and the roaming network AMF (ACCESS AND Mobility Management Function ), and the N14 interface is an interface between the home network AMF and the roaming network AMF. However, in the roaming scenario of the 5G core network, since the existing EPLMN list setting method cannot set the capability information of the terminal and the visited network differently, the terminal is easy to be moved to the visited network and cannot use voice service, or when the terminal cannot use voice service under the visited network, the terminal cannot actively return to the home network, which seriously affects user experience.

Fig. 1 shows a schematic diagram of a core network roaming architecture in a home network signal scenario, where a common method for setting an EPLMN list is: when the 5G terminal is accessed for the first time, the terminal needs to be firstly attached to/registered with a 4G/5G core network of a home network, when the home network is expected to be accessed to the 5G network by a user under the condition of insufficient coverage, an EPLMN list (EPLMN LIST) is issued to the terminal, the shared PLMN ID of the visited network is set as an equivalent PLMN of the current PLMN ID under the home network, the shared PLMN ID is set as a high priority PLMN, when the terminal receives the EPLMN list, the obtained current PLMN has the shared PLMN ID as the EPLMN, the terminal meets the reselection requirement, or when the network indicates that the terminal is redirected to the shared PLMN ID, the terminal can reselect or be redirected to the visited 5G network. However, since the existing EPLMN list setting method cannot issue the EPLMN list differently according to the capability information of the terminal and the visited network, the situation that voice service cannot be used after the terminal moves to the visited 5G network is easily caused, and user experience is seriously affected. For example, when the operator a and the operator B deploy a core network roaming scheme in the signaling scenario, the operator B may provide VoNR (Voice Over New Radio, new air interface voice) voice service for the user of the operator a, but since the operator B does not open an N26 interface with the operator a, the EPS FB service cannot be provided for the user UEA of the operator a. The 4G/5G network of operator a issues EPLMN LIST to the UEA when the UEA attaches/registers to the a network and sets PLMN a and PLMN X to equivalent PLMNs, after which the UEA can satisfy the 5G network re-selected and re-directed from operator a to operator B. However, there are both a terminal supporting VoNR and a terminal not supporting VoNR under the network of the operator a, and when the terminal UEA not supporting VoNR roams to the 5G network of the operator B, the network of the operator B cannot provide voice service for the UEA, and the terminal returns to 4G in a network-off re-search manner or cannot use voice service, so that user experience is very affected.

Under the scene of no home network signal, the common EPLMN list sending method comprises the following steps: when the 5G terminal is accessed for the first time, the 5G terminal randomly selects a network available for access for registration due to no home network signal; when the network currently registered by the 5G terminal user is exactly the visited network subscribed to the core network roaming, the visited network can issue an EPLMN list to the terminal, wherein the EPLMN list carries PLMN of the home network; after receiving the EPLMN list, the terminal sets the visited network PLMN roaming in the core network and the home network PLMN as equivalent, and the 5G terminal does not search the home network PLMN network signals regularly according to the definition of the 3GPP protocol, and tries to actively return to the home network cell. However, when the 5G terminal is first powered on, or moves to the visited network for the first time without EPLMN, if the visited network is in a home network signal free scenario, the visited network may successfully accept the registration request of the UE, regardless of whether the UE supports the voice service capability of the visited network. If the UE does not support the voice service capability of the visiting network, the UE cannot use the voice service under the visiting network and cannot actively return to the home network, so that the user experience is seriously affected.

Aiming at the technical problems, the application provides a setting method of an EPLMN list, core network equipment and a medium, wherein the core network equipment issues the EPLMN list in a distinguishing way according to capability information of a terminal and a visiting network, so that when the terminal cannot use voice service of the visiting network, the terminal cannot roam under the visiting network through reselection or redirection, the operation of frequently selecting the network by the terminal can be reduced, or the terminal cannot use the voice service under the visiting network can be ensured to actively return to a home network, the problem that the traditional setting method of the EPLMN list cannot set the capability information of the terminal and the visiting network in a distinguishing way, the voice service cannot be used after the terminal is easily caused to move to the visiting network, or when the terminal cannot use the voice service under the visiting network, the situation that the terminal cannot actively return to the home network is solved, and the user experience is seriously influenced is solved.

Having described the basic principles of the present application, various non-limiting embodiments of the present application will now be described in detail with reference to the accompanying drawings.

Example 1:

The embodiment provides a method for setting an EPLMN list, which is applied to core network equipment, as shown in fig. 2, and includes:

Step S101: and acquiring the capability information of the terminal and the capability information of the visiting network.

It should be noted that, when the current network is a 4G network, the method for setting the EPLMN list provided by the present invention may be applied to an MME of the current network, and when the current network is a 5G network, the method for setting the EPLMN list provided by the present invention may be applied to an AMF of the current network, where the current network refers to a home network in a scenario with a home network, and the current network refers to a visited network in a scenario without a home network.

Optionally, before the acquiring the capability information of the terminal, the method further includes:

In this embodiment, when the terminal attaches to the 4G home network/visited network, an attach request is sent to the core network device, where the attach request carries registration information of the terminal, and when the terminal registers to the 5G home network/visited network, a Registration request (registration request) is sent to the core network device, where the registration information of the terminal is carried.

In this embodiment, the registration information may include at least one of: location information of the terminal such as TAC (TRACKING AREA Code ), IMSI (International Mobile Subscriber Identity, international mobile subscriber identity), IMEI (International Mobile Equipment Identity ), MSISDN (Mobile Subscriber International ISDN, international mobile subscriber integrated services digital network), IMS (IP Multimedia Subsystem, multimedia subsystem) voice capability, short message capability, and emergency call capability, etc.

Specifically, whether the terminal meets the roaming condition of the core network can be judged according to the position information, and/or the IMSI, and/or the IMEI, and/or the MSISDN of the terminal.

In this embodiment, different operators may set different core network roaming conditions according to implementation situations, for example, the core network device may determine whether the terminal meets the core network roaming conditions only according to TAC location information or IMSI of the terminal, or may determine whether the terminal meets the core network roaming conditions according to a combination of TAC location information and IMSI.

In this embodiment, when the core network device determines that the terminal meets the roaming condition of the core network, the capability information of the terminal is acquired, where the capability information of the terminal may include a new air interface voice VoNR capability and/or an evolved packet circuit (EPS) FB capability, and may also include an IMS voice capability, an emergency call capability, and so on. The EPS FB capability, IMS voice capability, and emergency call capability may be obtained from the registration information.

Optionally, acquiring VoNR capabilities of the terminal may specifically include:

In this embodiment, the wireless network device is a base station, and the base station first initiates a UE capability query (UE capability enquiry) message to the terminal, and requests capability information of the terminal, including VoNR capability, supported frequency band information, and so on, from the terminal. The terminal sends UE capability information (UE capabilityinformation) to the base station, where the UE capability information carries a key capability field required by the network, and then the base station sends UE RADIO CAPABILITY INFO INDICATION (UE wireless capability information indication) to the core network device, where the UE capability information is carried, and it needs to be stated that, according to the 3GPP protocol, the existing core network device does not parse the UE capability information (UE capabilityinformation) of the terminal, but if the capability information of the terminal is not parsed, the core network device cannot learn VoNR capabilities of the terminal, so in the present invention, when the core network device receives the UE wireless capability information indication message carrying the UE capability information sent by the wireless network device, the message can be directly parsed, so as to obtain VoNR capabilities of the terminal.

In this embodiment, in order to avoid that when the UE wireless capability information indication message is parsed, the processing delay caused by excessive capability reading is too long, the present invention carries VoNR capability fields in the first request message and the first response message, so that the core network device does not need to parse the UE wireless capability information indication message, and can also obtain VoNR capability of the terminal. The VoNR capability field may be supported (supported) or unsupported (not supported), consistent with the VoNR capability indication in UECapabilityinformation, and is supported (supported) if the terminal supports VoNR capability (i.e., the terminal is VoNR capable and on), and is not supported (not supported) otherwise.

Optionally, the sending the first request message to the wireless network device specifically includes:

Transmitting a user terminal device UE radio capability matching request message (UE RADIO CAPABILITY MATCH REQUEST) or a UE radio capability check request message (UE RADIO CAPABILITY CHECK REQUEST) to the wireless network device;

The receiving the first response message sent by the wireless network device based on the first request message may specifically include:

receiving a UE wireless capability matching response message (UE RADIO CAPABILITY MATCH RESPONSE) sent by the wireless network device based on the UE wireless capability matching request message; or alternatively

A UE wireless capability check response message (UE RADIO CAPABILITY CHECK RESPONSE) sent by the wireless network device based on the UE wireless capability check request message is received.

In this embodiment, if the home network/visited network is a 4G network, in order to obtain VoNR capability of the terminal, a VoNR (Voice over NR) capability field may be carried in a UE radio capability matching request message (UE RADIO CAPABILITY MATCH REQUEST) sent by a core network device (MME) to a radio network device (eNB) and a UE radio capability matching response message (UE RADIO CAPABILITY MATCH RESPONSE) sent by the eNB to the MME, and descriptions of the VoNR (Voice over NR) capability fields are shown in table 1 and table 2:

table 1: voNR capability field description in UE RADIO CAPABILITY MATCH REQUEST

Table 2: voNR capability field description in UE RADIO CAPABILITY MATCH RESPONSE

In this embodiment, if the home network/visited network is a 5G network, in order to obtain VoNR capability of the terminal, a UE radio capability check request message (UE RADIO CAPABILITY CHECK REQUEST) sent by the core network device (AMF) to the radio network device (gNB) and a UE radio capability check response message (UE RADIO CAPABILITY CHECK RESPONSE) sent by the gNB to the AMF may carry VoNR (Voice over NR) capability fields, where descriptions of the VoNR (Voice over NR) capability fields are shown in table 3 and table 4:

Table 3: voNR capability field description in UE RADIO CAPABILITY CHECK REQUEST

Table 4: voNR capability field description in UE RADIO CAPABILITY CHECK RESPONSE

Step S102: judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network.

Step S103: and if the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent, carrying the roaming PLMN of the visiting network or the home PLMN of the home network in an EPLMN list and sending the roaming PLMN or the home PLMN of the home network to the terminal.

In this embodiment, the core network of the home network and the core network of the visited network both pre-store capability information of both parties, such as an N26 supporting case, a VoNR supporting case, an EPS FB (evolved packet circuit) supporting case, supported network frequency point information, and so on.

Optionally, the determining, according to the capability information of the terminal and the capability information of the visited network, whether the terminal meets a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent specifically includes:

Optionally, the determining, according to VoNR capabilities and/or EPS FB capabilities of the terminal and VoNR capabilities and EPS FB capabilities of the visited network, whether the terminal meets a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent specifically includes at least one of the following:

In this embodiment, the core network device may specifically determine, according to the capability information of the terminal and the capability information of the visited network shown in table 5, whether the terminal satisfies a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent, if the terminal satisfies a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent, then issue the roaming PLMN as EPLMN, otherwise, not issue the roaming PLMN as EPLMN.

Table 5: the corresponding relation between the capability information and whether the roaming PLMN is issued as EPLMN:

In this embodiment, in addition to the situation shown in table 5, in practical application, the core network device may determine whether to issue EPLMN LIST carrying the roaming PLMN of the visited network or the home PLMN of the home network according to the terminal or other capability information of the visited network, for example, considering that the visited network can only provide 5G services, but does not support IMS emergency call, even if the terminal supports VoNR, the emergency call service cannot be used, and the core network device does not open the core network roaming service for such users. If the visited network supports IMS voice, voNR but not EPS FB, IMS emergency call, terminal supports IMS voice, visited network frequency point, TAC location information belongs to the core network roaming area, and EPLMN LIST is not issued when VoNR and IMS emergency call are supported, otherwise EPLMN LIST is issued. For another example, considering that part of user information such as IMSI, MSISDN, IMEI can be obtained by the information network, if the user explicitly indicates that the user does not sign up for the core network roaming service, the network should not open the core network roaming service for the user according to IMSI, MSISDN, IMEI information, that is, if the visited network supports IMS voice, voNR but not EPS FB, the terminal supports IMS voice, supports a frequency point of the visited network, TAC location information belongs to the core network roaming area, but imsi=xxx, imei=yyy, or msisdn=zzz, no EPLMN LIST is issued, otherwise EPLMN LIST is issued.

Further, the rule set issued by EPLMN LIST can be customized with different degrees of refinement according to the needs of the operators. Such as: according to IMSI, IMEI, voNR of the terminal or the frequency point of the visited network, the IMS capability, EPSFB capability and other information, EPLMN LIST can be issued or not issued at a single terminal level, and according to the position information (TAC) of the terminal, voNR information can be issued or not issued EPLMN LIST to the terminal in a region.

Optionally, acquiring VoNR capabilities of the terminal specifically includes:

Receiving a tracking area Update (TRACKING AREA Update, TAU for short) message or a mobile registration Update (mobility registration Update, MRU for short) message sent by a terminal, wherein the tracking area Update message or the mobile registration Update message carries VoNR capability of the terminal;

In this embodiment, when a terminal that does not support VoNR capabilities (for example, the terminal has VoNR capabilities but VoNR capabilities are in a closed state) is not obtained EPLMN LIST after the 4G core network is successfully attached, at this time, the UE opens VoNR functions (that is, voNR capabilities are in an open state), at this time, the voice capabilities of the terminal change, the terminal initiates a TAU procedure, which includes reporting UE capabilities, VONR functions have been opened, the core network device re-determines, according to the VoNR capabilities after the terminal change, whether the terminal meets the conditions for issuing an EPLMN list, and if so, issues a TAU accept message, where EPLMN LIST is carried.

In this embodiment, when a terminal that does not support VoNR capabilities (for example, the terminal has VoNR capabilities but VoNR capabilities are in an off state) is successfully registered in the 5G core network, EPLMN LIST is not obtained, at this time, the UE opens VoNR functions (that is, voNR capabilities are in an on state), at this time, the voice capabilities of the terminal change, the terminal initiates an MRU procedure, where the UE capability report is included, VONR functions have been opened, and the home network core network device re-determines, according to the VoNR capabilities after the terminal change, whether the terminal meets the issuing condition of the EPLMN list, and if so, issues an MRU accept message, where EPLMN LIST is carried.

Optionally, the roaming PLMN of the visited network or the home PLMN of the home network carried in the EPLMN list is sent to the terminal, and specifically includes:

In this embodiment, in a scenario with a home network, a terminal resides in the home network, and when a home network core network device determines that the terminal meets a condition that a roaming PLMN of a visited network and a home PLMN of the home network are set to be equivalent, the home network core network device carries the roaming PLMN of the visited network in an EPLMN list and sends the roaming PLMN to the terminal; correspondingly, in the situation that the home network is not available, the terminal resides in the visited network, and when the visited network core network device judges that the terminal meets the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent, the home PLMN of the home network is carried in the EPLMN list and is sent to the terminal.

In this embodiment, if the terminal satisfies the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent, an attach accept message (ATTACH ACCEPT)/registration accept message (Registration accept) carrying the EPLMN list is sent to the terminal, or a tracking area update accept message/mobile registration update accept message carrying the EPLMN list is sent to the terminal.

It should be noted that, the method for setting the EPLMN list provided by the present invention does not modify EPLMN LIST the message body, adds the judgment logic only on the core network layer, and adds the processing filter, so that the core network can distribute EPLMN LIST terminals with different capacities under the condition that the terminals and the wireless network are not modified as much as possible, thereby improving the user experience.

Optionally, the method further comprises:

In this embodiment, the tracking area update failure message/mobile registration update failure message may carry a reject cause value, such as ：#11PLMN not allowed,#12Tracking area not allowed,#13roaming not allowed in this tracking area;#15No suitable Cells in tracking area.

In a specific embodiment, the network where the terminal currently resides is a 4G network, the core network device is an MME of a home network/a visited network, the radio network device is an eNB of the home network/the visited network, the terminal is a 5G terminal, and the method for setting the EPLMN list may include the following steps:

(1) The 5G terminal is started to select the network, and the frequency point where the HPLMN (Home Public Land Mobile Network, local public land mobile network) is located is selected to log in.

(2) After the 5G terminal searches for the 4G signal and the random access is successful, an attach request is initiated to the MME of the 4G core network, where IMSI, IMEI, location information (TAC), IMS voice capability (IMS PS Voice preferred, i.e., IMS packet domain voice priority, CS Voice as secondary, i.e., circuit domain voice priority second), short message capability, emergency call capability, and the like are carried, and the attach request is directly sent to the MME of the core network through NAS messages.

(3) The eNB initiates UE capability query (UEcapabilityenquiry) to the 5G terminal, requests 5G capability information of the terminal from the 5G terminal, and can identify VoNR capability through VoiceoverNR carried in the UE capability message and send the capability information to the 4G eNB when the 5G terminal supports VoNR. The method for transferring the UE capability information between the 4G wireless network and the core network is as follows:

a) After receiving the attach request, the core network MME can acquire information such as location information (e.g., TAC) and IMSI, IMEI, MSISDN of the 5G terminal. The MME may determine whether the 5G terminal satisfies the core network roaming condition according to such information, so as to perform a special action for such terminal, that is, when the MME determines that the 5G terminal satisfies the condition that the core network roaming is possible, the MME sends UE RADIO CAPABILITY MATCH REQUEST a message to the eNB, requests VoNR capability of the 5G terminal to the eNB, or the MME needs to start the procedure for all the 5G terminals. A new Voice over NR field is set in the message body of UE RADIO CAPABILITY MATCH REQUEST and UE RADIO CAPABILITY MATCH RESPONSE, the value is supported or not supported, the value is consistent with VoNR capability indication in UECapabilityinformation, when the eNB parses the UE radio capability and finds that VoiceoverNR field is supported, voiceoverNR is supported in UE RADIO CAPABILITY CHECK RESPONSE message, so that MME successfully obtains VoNR capability of 5G terminal.

B) And the eNB sends the UE capability message to the MME, and the MME directly analyzes and reads VoNR G terminal capability.

(4) And the MME acquires and stores the capability information of the 5G terminal.

(5) The MME judges whether the 5G terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent, if yes, the step (7) is skipped, otherwise, the step (6) is skipped:

Specifically, if the visited network supports VoNR capabilities, supports EPS FB capabilities, and the terminal supports at least one of VoNR capabilities and EPS FB capabilities, then it is determined that the terminal satisfies a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

Specifically, if the visited network supports VoNR capabilities and EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities, and the terminal is a non-voice terminal, then the terminal is judged to satisfy a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

specifically, if the visited network supports VoNR capabilities but does not support EPS FB capabilities, and the terminal supports VoNR capabilities, determining that the terminal satisfies a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

Specifically, if the visited network supports VoNR capabilities but does not support EPS FB capabilities, and the terminal does not support VoNR capabilities but supports EPS FB capabilities, then determining that the terminal does not meet a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

Specifically, if the visited network supports VoNR capabilities but does not support EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities, and the terminal is a non-voice terminal, then determining that the terminal satisfies a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent;

Specifically, if the visited network does not support VoNR capabilities but supports EPS FB capabilities, the terminal supports EPS FB capabilities, then determining that the terminal satisfies a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

Specifically, if the visited network does not support VoNR capabilities but supports EPS FB capabilities, and the terminal supports VoNR capabilities but does not support EPS FB capabilities, determining that the terminal does not meet a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent;

Specifically, if the visited network does not support VoNR capabilities, but supports EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities, and the terminal is a non-voice terminal, then the terminal is judged to satisfy a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

Specifically, if the visited network does not support VoNR capabilities, does not support EPS FB capabilities, and the terminal supports at least one of VoNR capabilities and EPS FB capabilities, then determining that the terminal does not meet a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent;

Specifically, if the visited network does not support VoNR capabilities, does not support EPS FB capabilities, the terminal does not support VoNR capabilities and EPS FB capabilities, and the terminal is a non-voice terminal, it is determined that the terminal satisfies a condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent.

(6) The MME issues an attach accept (ATTACH ACCEPT) message to the 5G terminal, not carrying EPLMN LIST.

(7) The MME issues an attach accept (ATTACH ACCEPT) message to the 5G terminal, carrying EPLMN LIST to set the roaming PLMN of the visited network and the home PLMN of the home network as equivalent PLMNs.

In another specific embodiment, if the network where the terminal currently resides is a 5G network, the core network device is an AMF of the home network/the visited network, the radio network device is a gNB of the home network/the visited network, the terminal is a 5G terminal, and the method for setting the EPLMN list may include the following steps:

(1) The 5G terminal is started to select the network, and the frequency point where the HPLMN is located is preferentially selected for logging in.

(2) After the 5G terminal searches for the 5G signal and the random access is successful, registration request (registration request) is initiated to the AMF of the 5G core network, where IMSI, IMEI, location information (TAC), IMS voice capability (IMS PS Voice preferred, i.e. IMS packet domain voice priority, CS Voice as secondary, i.e. circuit domain voice priority second), short message capability, emergency call capability, etc. are carried, and the short message capability, emergency call capability, etc. are directly sent to the AMF of the core network through NAS message.

(3) The gNB initiates UE capability query to the 5G terminal (UEcapabilityenquiry), requests 5G capability information of the terminal from the 5G terminal, and can identify VoNR capability through VoiceoverNR carried in the UE capability message and send the capability information to the gNB of the 5G when the 5G terminal supports VoNR. The method for transferring the UE capability information between the 5G wireless network and the core network is as follows:

a) After receiving Registration request, the core network AMF may learn information such as location information (e.g. TAC) of the 5G terminal, IMSI, IMEI, MSISDN, etc. The AMF may determine, according to such information, whether the 5G terminal satisfies the core network roaming condition, so that a special action is performed for such terminal, that is, when the AMF determines that the 5G terminal satisfies the condition that the core network roaming is possible, the AMF sends UE RADIO CAPABILITY CHECK REQUEST a message to the gNB, requests VoNR capability of the 5G terminal to the gNB, or the AMF needs to start the procedure for all the 5G terminals. A new Voice over NR field is set in the message body of UE RADIO CAPABILITY CHECK REQUEST and UE RADIO CAPABILITY CHECK RESPONSE, the value is supported or not supported, the value is consistent with VoNR capability indication in UECapabilityinformation, when the gNB parses the UE radio capability, and when the VoiceoverNR field is found to be supported, the message returns VoiceoverNR to be supported in UE RADIO CAPABILITY CHECK RESPONSE, so that the AMF successfully obtains VoNR capability of the 5G terminal.

B) And the gNB sends the UE capability message to the AMF, and the AMF directly analyzes and reads VoNR G terminal capability.

(4) The AMF acquires and stores the capability information of the 5G terminal.

(5) The AMF judges whether the 5G terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent, if yes, the step (7) is skipped, otherwise, the step (6) is skipped:

(6) The AMF issues a registration accept (Registration accept) message to the 5G terminal, not carrying EPLMN LIST.

(7) The AMF issues a registration accept (Registration accept) message to the 5G terminal, carrying EPLMN LIST to set the roaming PLMN of the visited network and the home PLMN of the home network to equivalent PLMNs.

Example 2:

As shown in fig. 3, this embodiment provides a core network device, configured to execute the method for setting the EPLMN list, including:

a capability acquiring module 11, configured to acquire capability information of a terminal and capability information of a visited network;

A condition judging module 12, connected to the capability acquiring module 11, configured to judge, according to the capability information of the terminal and the capability information of the visited network, whether the terminal meets a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent;

And the list issuing processing module 13 is connected with the condition judging module 12 and is used for carrying the roaming PLMN of the visiting network or the home PLMN of the home network in the EPLMN list and sending the roaming PLMN of the visiting network or the home PLMN of the home network to the terminal if the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent.

Optionally, the core network device further includes:

A registration information acquisition module, configured to receive an attach request/registration request of the terminal, and acquire registration information of the terminal from the attach request/registration request of the terminal;

the roaming condition judging module is used for judging whether the terminal meets the core network roaming condition according to the registration information;

The capability acquisition module 11 is specifically configured to:

Optionally, the registration information includes: the position information of the terminal and/or the international mobile subscriber identity IMSI and/or the international mobile equipment identity IMEI and/or the international mobile subscriber integrated services digital network MSISDN;

The roaming condition judging module is specifically configured to:

Optionally, the capability acquiring module 11 includes:

and the terminal capability acquiring unit is used for acquiring the new air interface voice VoNR capability and/or the evolved packet circuit (EPS) FB capability of the terminal.

Optionally, the terminal capability acquiring unit includes:

A first sending unit, configured to send a first request message to a wireless network device, where the first request message is used to request to obtain VoNR capabilities of the terminal;

A first receiving unit, configured to receive a first response message sent by the wireless network device based on the first request message, where the first response message carries VoNR capability fields;

a first obtaining unit, configured to obtain VoNR capability of the terminal according to the value of the VoNR capability field, where if the value of the VoNR capability field is supported, it indicates that the terminal has VoNR capability and is in an on state, and if the value of the VoNR capability field is not supported, it indicates that the terminal does not have VoNR capability or has VoNR capability but the VoNR capability is in an off state.

Optionally, the first sending unit is specifically configured to:

The first receiving unit is specifically configured to:

Optionally, the terminal capability acquiring unit includes:

a second receiving unit, configured to receive a UE wireless capability information indication message sent by a wireless network device;

and the analysis acquisition unit is used for analyzing the UE wireless capability information indication message and acquiring VoNR capability of the terminal.

Optionally, the condition judgment module 12 is specifically configured to:

Optionally, the condition determining module 12 specifically determines whether the terminal satisfies a condition that sets the roaming PLMN of the visited network and the home PLMN of the home network to be equivalent according to at least one of:

Optionally, the terminal capability acquiring unit includes:

an update message receiving unit, configured to receive a tracking area update message or a mobile registration update message sent by a terminal, where the tracking area update message or the mobile registration update message carries VoNR capabilities of the terminal;

VoNR obtaining unit, configured to obtain VoNR capability of the terminal from the tracking area update message or the mobile registration update message.

Optionally, the list issuing processing module 13 includes:

a first issuing unit, configured to, if the core network device is a home network core network device, carry a roaming PLMN of the visited network in an EPLMN list and send the roaming PLMN to the terminal;

And the second issuing unit is used for carrying the home PLMN of the home network in the EPLMN list and sending the home PLMN to the terminal if the core network equipment is the visit network core network equipment.

Optionally, the list issuing processing module 13 includes:

a message sending unit, configured to send an EPLMN list carrying a roaming PLMN of the visited network or a home PLMN of a home network to the terminal through an attach accept message/a registration accept message; or alternatively

Optionally, the core network device further includes:

and the first processing module is used for not sending the EPLMN list to the terminal or sending the EPLMN list which does not carry the roaming PLMN of the visiting network to the terminal if the core network equipment is home network core network equipment and the terminal does not meet the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent.

Optionally, the core network device further includes:

And the second processing module is used for rejecting the access of the terminal and sending an attachment failure message/registration failure message carrying a reject cause value to the terminal or sending a tracking area update failure message/mobile registration update failure message carrying a reject cause value to the terminal if the core network equipment is visited network core network equipment and the terminal does not meet the condition that the roaming PLMN of the visited network and the home PLMN of the home network are set to be equivalent.

Example 3:

Referring to fig. 4, the present embodiment provides a core network device comprising a memory 21 and a processor 22, the memory 21 having stored therein a computer program, the processor 22 being arranged to run the computer program to perform the method of setting the EPLMN list in embodiment 1.

The memory 21 is connected to the processor 22, the memory 21 may be a flash memory, a read-only memory, or other memories, and the processor 22 may be a central processing unit or a single chip microcomputer.

Example 4:

the present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of setting the EPLMN list in embodiment 1 described above.

Computer-readable storage media include volatile or nonvolatile, removable or non-removable media implemented in any method or technology for storage of information such as computer-readable instructions, data structures, computer program modules or other data. Computer-readable storage media includes, but is not limited to, RAM (Random Access Memory ), ROM (Read-Only Memory), EEPROM (ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY, charged erasable programmable Read-Only Memory), flash Memory or other Memory technology, CD-ROM (Compact Disc Read-Only Memory), digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer.

The core network device and the medium provided in embodiments 2 to 4 first obtain capability information of the terminal and capability information of the visited network; then judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network; and if the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent, carrying the roaming PLMN of the visiting network or the home PLMN of the home network in an EPLMN list and sending the roaming PLMN or the home PLMN of the home network to the terminal. The invention can issue EPLMN list differently according to the capability information of terminal and visiting network, so it can ensure that when terminal can not use visiting network voice service, it can not use reselecting or redirecting roaming to visiting network, and can reduce frequent network selecting operation of terminal, or can ensure terminal can not use voice service under visiting network, and can actively return to home network, solving the problem that current EPLMN list setting method can not set differently for terminal and visiting network capability information, which can easily result in terminal unable to use voice service after moving to visiting network, or terminal unable to actively return to home network when terminal unable to use voice service under visiting network, seriously affecting user experience.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.

Claims

1. A method for setting an EPLMN list of a peer-to-peer public land mobile network, applied to a core network device, the method comprising:

Acquiring capability information of a terminal and capability information of a visiting network; the capability information of the terminal comprises VoNR capability and EPS FB capability of the terminal, and the capability information of the visiting network comprises VoNR capability and EPS FB capability of the visiting network;

Judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network; if the terminal does not support VoNR capability and EPS FB capability and is a non-voice terminal, judging that the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent;

2. The method for setting an EPLMN list according to claim 1, wherein before the acquiring the capability information of the terminal, the method further comprises:

3. The method for setting an EPLMN list according to claim 2, wherein the registration information includes: the position information of the terminal and/or the international mobile subscriber identity IMSI and/or the international mobile equipment identity IMEI and/or the international mobile subscriber integrated services digital network MSISDN;

4. The method for setting an EPLMN list according to claim 1, wherein obtaining VoNR capabilities of the terminal specifically includes:

5. The method for setting an EPLMN list according to claim 4, wherein the sending the first request message to the wireless network device specifically includes:

6. The method for setting an EPLMN list according to claim 1, wherein obtaining VoNR capabilities of the terminal specifically includes:

7. The method for setting an EPLMN list according to claim 1, wherein the determining whether the terminal satisfies a condition that a roaming PLMN of a visited network and a home PLMN of a home network are set to be equivalent according to capability information of the terminal and capability information of the visited network specifically includes:

8. The method for setting an EPLMN list according to claim 7, wherein the determining, according to VoNR capabilities and/or EPS FB capabilities of the terminal and VoNR capabilities and EPS FB capabilities of the visited network, whether the terminal satisfies a condition that a roaming PLMN of the visited network and a home PLMN of the home network are set to be equivalent specifically includes at least one of:

9. The method for setting an EPLMN list according to claim 1, wherein obtaining VoNR capabilities of the terminal specifically includes:

10. The method for setting an EPLMN list according to claim 1, wherein the sending the EPLMN list carrying the roaming PLMN of the visited network or the home PLMN of the home network to the terminal specifically includes:

11. The method for setting an EPLMN list according to claim 1, wherein the sending the EPLMN list carrying the roaming PLMN of the visited network or the home PLMN of the home network to the terminal specifically includes:

12. The method for setting an EPLMN list according to claim 1, further comprising:

13. The method for setting an EPLMN list according to claim 1, further comprising:

14. A core network device, comprising:

the capability acquisition module is used for acquiring capability information of the terminal and capability information of the visiting network; the capability information of the terminal comprises VoNR capability and EPS FB capability of the terminal, and the capability information of the visiting network comprises VoNR capability and EPS FB capability of the visiting network;

The condition judging module is connected with the capability acquiring module and is used for judging whether the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent according to the capability information of the terminal and the capability information of the visiting network; if the terminal does not support VoNR capability and EPS FB capability and is a non-voice terminal, judging that the terminal meets the condition that the roaming PLMN of the visiting network and the home PLMN of the home network are set to be equivalent;

15. A core network device comprising a memory and a processor, the memory having stored therein a computer program, the processor being arranged to run the computer program to implement a method of setting an EPLMN list as claimed in any one of claims 1 to 13.

16. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements a method of setting an EPLMN list according to any of claims 1-13.