WO2022174744A1

WO2022174744A1 - Plmn selection method and apparatus, and terminal and amf

Info

Publication number: WO2022174744A1
Application number: PCT/CN2022/075509
Authority: WO
Inventors: 王胡成
Original assignee: 大唐移动通信设备有限公司
Priority date: 2021-02-18
Filing date: 2022-02-08
Publication date: 2022-08-25
Also published as: CN114979936A

Abstract

Provided are a PLMN selection method and apparatus, and a terminal and an AMF. The method comprises: a terminal sending a registration request to an access and mobility management function (AMF) of a first visited public land mobile network (VPLMN); the terminal receiving a registration response message or a de-registration request sent by the AMF of the first VPLMN, wherein the registration response message or the de-registration request includes location information of the terminal; and the terminal executing a PLMN reselection operation according to the location information.

Description

PLMN selection method, device, terminal and AMF

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure claims priority to Chinese Patent Application No. 202110190546.8 filed in China on Feb. 18, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present disclosure relates to the field of communication technologies, and in particular, to a PLMN selection method, device, terminal, and AMF.

Background technique

Currently, the selection problem of Public Land Mobile Network (PLMN) for satellite access scenarios is proposed. The current technology considers the PLMN selection technology based on the terminal location, allowing the terminal to select an appropriate PLMN according to the current location; and when the terminal location is inaccurate, the network can send an instruction to the terminal, so that the terminal can select a PLMN through the instruction. When a user equipment (User Equipment, UE) selects a PLMN, it needs to refer to the PLMN selection information provided by the home PLMN (Home PLMN, HPLMN), such as Steer of Roaming (SoR).

A shared PLMN identity document (ID) is a newly defined PLMN ID whose Mobile Country Code (MCC) starts with 9xx. The PLMN is not associated with any one country, but may be able to provide communication services on a global scale. Therefore, in a specific country, there may also be coverage of shared PLMNs. Satellite access networks are capable of providing global network coverage, and operators providing satellite access services are considered shared PLMNs.

Then, in the related art, if the terminal location is inaccurate or has no location capability, the terminal is likely to be unable to select an appropriate visited PLMN (Visited PLMN, VPLMN).

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present disclosure is to provide a PLMN selection method, device, terminal and AMF, so as to solve the problem that the terminal cannot accurately select the PLMN in the related art.

In order to solve the above problems, an embodiment of the present disclosure provides a public land mobile network PLMN selection method, the method includes:

The terminal sends a registration request to the access and mobility management function AMF of the first visited public land mobile network VPLMN;

The terminal receives a registration response message or a deregistration request sent by the AMF of the first VPLMN, and the registration response message or the deregistration request includes the location information of the terminal;

The terminal performs a PLMN reselection operation according to the location information.

Wherein, if the registration response message is a registration rejection message, the terminal performs a PLMN reselection operation according to the location information, specifically including:

The terminal performs a PLMN reselection operation according to the location information of the terminal and the local PLMN selection information contained in the registration rejection message.

Wherein, if the registration response message is a registration permission message, after the terminal successfully registers with the first VPLMN according to the registration response message, the method further includes:

The terminal receives the roaming guidance SoR information sent by the AMF of the first VPLMN;

The terminal performs a PLMN reselection operation according to the location information, which specifically includes:

The terminal performs a PLMN reselection operation according to the location information and the SoR information.

Wherein, the SoR information includes a plurality of geo-fence information, and a PLMN selection list corresponding to each of the geo-fence information;

The terminal performs a PLMN reselection operation according to the location information and the SoR information, specifically including:

The terminal selects one geo-fence information from the plurality of geo-fence information according to the location information, and performs a PLMN reselection operation according to the PLMN selection list corresponding to the selected geo-fence information.

Wherein, the SoR information includes a geo-fence information covering the location of the terminal, and a PLMN selection list corresponding to the geo-fence information;

The terminal performs a PLMN reselection operation according to the PLMN selection list corresponding to the geo-fence information.

Wherein, after the terminal receives the roaming guidance SoR information sent by the AMF of the first VPLMN, the method further includes:

receiving, by the terminal, at least one geo-fence information associated with the SoR information and sent by the AMF of the first VPLMN;

If the number of associated geofence information is 1, the terminal performs a PLMN reselection operation according to the SoR information;

If the number of associated geo-fence information is greater than one, the terminal selects the geo-fence information covering the location information of the terminal from the plurality of associated geo-fence information according to the location information, and selects the geo-fence information covering the location information of the terminal according to the selected geo-fence information. The SoR information corresponding to the fence information performs the PLMN reselection operation.

Wherein, the geo-fence information and SoR information are obtained by the AMF of the first VPLMN from the SoR application function AF network element, wherein the geo-fence information and SoR information are obtained by the SoR AF network element when determining the access point of the terminal The first VPLMN is determined based on the location information of the terminal after the shared PLMN.

Wherein, the PLMN selection list is obtained by the AMF of the first VPLMN from the SoR application function AF network element, and the PLMN selection list is determined by the SoR AF network element based on the location information of the terminal.

Wherein, the method also includes:

If the terminal determines to move out of the coverage corresponding to the geo-fence information, it sends the move out indication information to the SoR AF network element;

Receive the updated SoR information sent by the SoR AF network element;

PLMN reselection operation is performed according to the updated SoR information.

Wherein, the method also includes:

If the terminal is not within the coverage area corresponding to any geo-fence information in the SoR information, the terminal performs a PLMN reselection operation according to the local PLMN selection information.

Wherein, the geo-fence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.

Wherein, the location information of the terminal is acquired by the AMF of the first VPLMN through the location management function LMF network element.

Wherein, the location information of the terminal includes at least one of the following:

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

Embodiments of the present disclosure also provide a method for selecting a public land mobile network PLMN, the method comprising:

The access and mobility management function AMF of the first visited public land mobile network VPLMN receives the registration request sent by the terminal;

In response to the registration request, the AMF of the first VPLMN sends a registration response message or a de-registration request to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or de-registration request includes the the location information of the terminal.

The registration response message is a registration rejection message.

The AMF of the first VPLMN sends roaming guidance SoR information to the terminal.

or,

The SoR information includes a geo-fence information covering the location of the terminal, and a PLMN selection list corresponding to the geo-fence information.

Wherein, after the AMF of the first VPLMN sends the roaming guidance SoR information to the terminal, the method further includes:

The AMF of the first VPLMN sends at least one geofence information associated with the SoR information to the terminal.

Wherein, the geo-fence information and SoR information are obtained by the AMF of the first VPLMN from the SoR application function AF network element, wherein the geo-fence information and SoR information are obtained by the SoR AF network element when determining the access point of the terminal. The first VPLMN is determined based on the location information of the terminal after the shared PLMN.

Wherein, the geo-fence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.

Wherein, before sending a registration response message or a deregistration request to the terminal, the method further includes:

The AMF of the first VPLMN acquires the location information of the terminal through the location management function LMF network element.

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

The embodiment of the present disclosure also provides a public land mobile network PLMN selection apparatus, the apparatus includes:

a first sending unit, configured to send a registration request to the access and mobility management function AMF of the first visited public land mobile network VPLMN;

a first receiving unit, configured to receive a registration response message or a de-registration request sent by the AMF of the first VPLMN, where the registration response message or the de-registration request includes the location information of the terminal;

A first reselection unit, configured to perform a PLMN reselection operation according to the location information.

Wherein, if the registration response message is a registration rejection message, the first reselection unit includes:

The first reselection subunit is configured to perform a PLMN reselection operation according to the location information of the terminal and the local PLMN selection information contained in the registration rejection message.

Wherein, if the registration response message is a registration permission message, after successfully registering with the first VPLMN according to the registration response message, the device further includes:

A third receiving unit, configured to receive the roaming guidance SoR information sent by the AMF of the first VPLMN;

The first reselection unit includes:

A second reselection subunit, configured to perform a PLMN reselection operation according to the location information and the SoR information.

The second reselection subunit is further used for:

According to the location information, one of the geo-fence information is selected from the plurality of geo-fence information, and a PLMN reselection operation is performed according to the PLMN selection list corresponding to the selected geo-fence information.

The second reselection subunit is further used for:

The PLMN reselection operation is performed according to the PLMN selection list corresponding to the geo-fence information.

Wherein, after receiving the roaming guidance SoR information sent by the AMF of the first VPLMN, the apparatus further includes:

a fourth receiving unit, configured to receive at least one geo-fence information associated with the SoR information sent by the AMF of the first VPLMN;

The second reselection subunit is further used for:

If the number of associated geo-fence information is 1, the PLMN reselection operation is performed according to the SoR information;

If the number of associated geo-fence information is greater than one, select the geo-fence information covering the location information of the terminal from the plurality of associated geo-fence information according to the location information, and correspond to the geo-fence information according to the selected geo-fence information. The SoR information performs PLMN reselection operation.

The geo-fence information and SoR information are obtained by the AMF of the first VPLMN from the SoR application function AF network element, wherein the geo-fence information and SoR information are obtained by the SoR AF network element when determining the terminal access The first VPLMN is determined based on the location information of the terminal after the shared PLMN.

Wherein, the device also includes:

A third sending unit, configured to send the removal indication information to the SoR AF network element if it is determined to move out of the coverage corresponding to the geo-fence information;

The fifth receiving unit, for receiving the updated SoR information sent by the SoR AF network element;

The second reselection unit is configured to perform a PLMN reselection operation according to the updated SoR information.

Wherein, the device also includes:

The third reselection unit is configured to perform a PLMN reselection operation according to the local PLMN selection information if the terminal is not within the coverage area corresponding to any geo-fence information in the SoR information.

Wherein, the geo-fence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.

The area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

An embodiment of the present disclosure further provides a terminal, including a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:

Send a registration request to the access and mobility management function AMF of the first visited public land mobile network VPLMN;

Receive a registration response message or a de-registration request sent by the AMF of the first VPLMN, where the registration response message or the de-registration request includes the location information of the terminal;

A PLMN reselection operation is performed according to the location information.

Wherein, if the registration response message is a registration rejection message, the processor is further configured to read the computer program in the memory and perform the following operations:

The PLMN reselection operation is performed according to the location information of the terminal and the local PLMN selection information contained in the registration rejection message.

Wherein, if the registration response message is a registration permission message, after the terminal successfully registers with the first VPLMN according to the registration response message, the processor is further configured to read the computer program in the memory and perform the following operations:

receiving roaming guidance SoR information sent by the AMF of the first VPLMN;

Performing a PLMN reselection operation according to the location information specifically includes:

A PLMN reselection operation is performed according to the location information and the SoR information.

The processor is also configured to read the computer program in the memory and perform the following operations:

Wherein, after receiving the roaming guidance SoR information sent by the AMF of the first VPLMN, the processor is further configured to read the computer program in the memory and perform the following operations:

receiving at least one geo-fence information associated with the SoR information sent by the AMF of the first VPLMN;

Wherein, the processor is further configured to read the computer program in the memory and perform the following operations:

If it is determined to move out of the coverage area corresponding to the geo-fence information, send out indication information to the SoR AF network element;

Receive the updated SoR information sent by the SoR AF network element;

If the terminal is not within the coverage area corresponding to any geo-fence information in the SoR information, the PLMN reselection operation is performed according to the local PLMN selection information.

Wherein, the geo-fence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

a second receiving unit, configured to receive a registration request sent by the terminal;

The second sending unit is configured to, in response to the registration request, send a registration response message or a de-registration request to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or de-registration request includes the the location information of the terminal. The registration response message is a registration rejection message.

The fifth sending unit is configured to send the roaming guidance SoR information to the terminal.

or,

Wherein, after sending the roaming guidance SoR information to the terminal, the apparatus further includes:

A sixth sending unit, configured to send at least one piece of geo-fence information associated with the SoR information.

Wherein, the geo-fence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.

Wherein, the device also includes:

A location acquisition unit, configured to acquire the location information of the terminal through the location management function LMF network element.

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

The embodiments of the present disclosure also provide an access and mobility management function AMF, where the AMF is an AMF of the first VPLMN, including a memory, a transceiver, and a processor:

Receive the registration request sent by the terminal;

In response to the registration request, a registration response message or a de-registration request is sent to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or the de-registration request includes the location information of the terminal.

The registration response message is a registration rejection message.

Send roaming guidance SoR information to the terminal.

or,

Wherein, after sending the roaming guidance SoR information to the terminal, the processor is further configured to read the computer program in the memory and perform the following operations:

At least one geofence information associated with the SoR information is sent to the terminal.

Wherein, the geo-fence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.

The location information of the terminal is acquired through the location management function LMF network element.

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

Embodiments of the present disclosure further provide a processor-readable storage medium, where a computer program is stored in the processor-readable storage medium, and the computer program is used to cause the processor to execute the above method.

The above-mentioned technical solutions of the present disclosure have at least the following beneficial effects:

In the PLMN selection method, device, terminal, and AMF according to the embodiments of the present disclosure, the terminal sends the location information of the terminal from the AMF of the first VPLMN, so that the terminal with weak positioning capability or no positioning capability can rely on the information obtained from the AMF of the first VPLMN. The location information selects the correct VPLMN to improve the selection efficiency of PLMN.

Description of drawings

1 shows one of the flow charts of the steps of the PLMN selection method provided by the embodiment of the present disclosure;

FIG. 2 shows the second flow chart of the steps of the PLMN selection method provided by the embodiment of the present disclosure;

FIG. 3 is an interactive schematic diagram of Example 1 of a PLMN selection method provided by an embodiment of the present disclosure;

FIG. 4 is an interactive schematic diagram of Example 2 of a PLMN selection method provided by an embodiment of the present disclosure;

FIG. 5 is an interactive schematic diagram of Example 3 of a PLMN selection method provided by an embodiment of the present disclosure;

FIG. 6 is an interactive schematic diagram of Example 4 of a PLMN selection method provided by an embodiment of the present disclosure;

FIG. 7 is an interactive schematic diagram of Example 5 of a PLMN selection method provided by an embodiment of the present disclosure;

FIG. 8 shows one of the schematic structural diagrams of the PLMN selection device provided by the embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of a terminal provided by an embodiment of the present disclosure;

FIG. 10 shows the second schematic structural diagram of the PLMN selection apparatus provided by the embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of an AMF provided by an embodiment of the present disclosure.

Detailed ways

In order to make the technical problems, technical solutions and advantages to be solved by the present disclosure more clear, detailed description will be given below with reference to the accompanying drawings and specific embodiments.

In the embodiments of the present disclosure, the term "and/or" describes the association relationship of associated objects, and indicates that there can be three kinds of relationships. For example, A and/or B can indicate that A exists alone, A and B exist at the same time, and B exists alone these three situations. The character "/" generally indicates that the associated objects are an "or" relationship.

In the embodiments of the present disclosure, the term "plurality" refers to two or more than two, and other quantifiers are similar.

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

The technical solutions provided by the embodiments of the present disclosure may be applicable to various systems, especially a fifth-generation mobile communication technology (5th-Generation, 5G) system. For example, the applicable system may be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet Wireless service (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, Long term evolution advanced (LTE-A) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G New Radio (New Radio, NR) system, etc. These various systems include terminal equipment and network equipment. The system may also include a core network part, such as an evolved packet system (Evloved Packet System, EPS), a 5G system (5G system, 5GS), and the like.

The terminal involved in the embodiments of the present disclosure may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem. In different systems, the name of the terminal may be different. For example, in the 5G system, the terminal may be called user equipment (User Equipment, UE). Wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via a radio access network (Radio Access Network, RAN). "telephone) and computers with mobile terminal equipment, eg portable, pocket-sized, hand-held, computer-built or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (Personal Digital Assistants), PDA) and other devices. Wireless terminal equipment may also be referred to as system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point , a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in the embodiments of the present disclosure.

As shown in FIG. 1, an embodiment of the present disclosure provides a public land mobile network PLMN selection method, the method includes:

Step 101, the terminal sends a registration request to the Access and Mobility Management Function (AMF) of the first visited public land mobile network VPLMN;

Step 102, the terminal receives a registration response message or a de-registration request sent by the AMF of the first VPLMN, and the registration response message or the de-registration request includes the location information of the terminal;

Step 103, the terminal performs a PLMN reselection operation according to the location information.

It should be noted that the first VPLMN mentioned in the embodiments of the present disclosure is: a VPLMN selected by a terminal with positioning capability according to its own position and existing PLMN selector information; The VPLMN selected by the PLMN selector information.

As an optional embodiment, the location information of the terminal is acquired by the AMF of the first VPLMN through a location management function (Location Management Function, LMF) network element. Regardless of whether the terminal has a positioning function or not, when the terminal accesses the first VPLMN through a satellite, the AMF of the first VPLMN can obtain the location information of the terminal through the LMF network element.

In this embodiment of the present disclosure, the location information of the terminal obtained by the terminal from the AMF of the first VPLMN is different from the location information obtained by the terminal with positioning capability itself. The location information of the terminal obtained from the AMF of the VPLMN is more accurate, so that the terminal with weak positioning capability or no positioning capability can select the correct VPLMN according to the location information obtained from the AMF of the first VPLMN, thereby improving the selection efficiency of the PLMN.

As an optional embodiment, the location information of the terminal includes at least one of the following:

The area code of the area where the terminal is currently located (if the terminal is located in an international area and the area has an international code);

The country code of the area where the terminal is currently located (if the terminal is located in the country);

Geographic location information of the terminal (if the terminal is located in an ambiguous location, or in an area without an international code).

In at least one optional embodiment of the present disclosure, if the registration response message is a registration rejection message, step 103 includes:

In the related art, on the one hand, in the international public area, the PLMN recommended by the VPLMN may not be synchronized with the SoR information of the terminal, or may not be synchronized, resulting in incorrect VPLMN selection; on the other hand, in the shared PLMN scenario, when the terminal accesses When a PLMN is shared, the shared PLMN may cover the whole world, including the international public area, and the relevant SoR information cannot indicate the PLMN selection list in the international area.

In another optional embodiment of the present disclosure, if the registration response message is a registration permission message, after the terminal successfully registers with the first VPLMN according to the registration response message, the method further includes:

The terminal receives the roaming guidance SoR information sent by the AMF of the first VPLMN; wherein, the SoR information is passed by the AMF of the first VPLMN through the SoR application function (Steer of Roaming-Application Function, SoR-AF) network of the home PLMN Yuan obtained. Wherein, the SoR-AF network element determines the SoR information based on the location information of the terminal.

Correspondingly, step 103 includes:

In this case, the terminal can select the correct PLMN according to the SoR information provided by the home PLMN, so as to improve the selection efficiency of the PLMN.

In at least one embodiment of the present disclosure, the geo-fence information exists in two forms, namely:

Form 1, the SoR information itself is enhanced, that is, the geofence information is added to the SoR information.

Form 2, the SoR information is unchanged (same as the related SoR information), but the SoR information is associated with the geofence information.

For form 1, the SoR information includes a plurality of geo-fence information, and a PLMN selection list corresponding to each of the geo-fence information; the terminal performs a PLMN reselection operation according to the location information and the SoR information, specifically include:

The terminal selects one piece of geo-fence information from the plurality of geo-fence information according to the location information, and performs a PLMN reselection operation according to the PLMN selection list corresponding to the selected geo-fence information.

For example, the SoR information can be in the form of Table 1:

Table 1

Or, for form 1, the SoR information includes a geo-fence information covering the location of the terminal, and a PLMN selection list corresponding to the geo-fence information; the terminal is based on the location information and the SoR information. Perform PLMN reselection operations, including:

For example, the SoR information can be in the form of Table 2:

Table 2

For form 2, the SoR information is associated with at least one geofence information. After the terminal receives the roaming guidance SoR information sent by the AMF of the first VPLMN, the method further includes:

receiving, by the terminal, at least one geo-fence information associated with the SoR information sent by the AMF of the first VPLMN;

In other words, if the SoR information has only one geofence information associated with it, the terminal does not need to locate, and directly performs PLMN selection according to the SoR information; otherwise, the terminal needs to locate itself, and determine which geofence information corresponds to the coverage area according to its own location, and then PLMN selection is performed using the SoR information associated with the geofence information.

For example, if the terminal does not have the positioning capability, the SoR-AF network element can only provide the geo-fence information covering the location of the terminal and the PLMN selection list within the geographic range corresponding to the geo-fence information; or, if the terminal does not have the positioning capability, the SoR-AF - The AF network element may only provide SoR information associated with the geofence information covering the location of the terminal. In this case, the SoR-AF network element is required to obtain the terminal's positioning capability information (that is, whether the terminal has the positioning capability), or the AMF or Unified Data Management (UDM) entity is required to actively report the terminal's positioning capability information. For another example, when the terminal accesses the shared PLMN, it can only obtain the PLMN selection list of the area where the terminal is located, so as to avoid providing the terminal with unnecessary PLMN selection information (for example, the area that the terminal will not reach at present).

In at least one embodiment of the present disclosure, the geo-fencing information and the SoR information are obtained by the AMF of the first VPLMN from a SoR application function (Application Function, AF) network element, wherein the geo-fencing (Geo-Fencing) The information and SoR information are determined by the SoR AF network element based on the location information of the terminal after determining that the first VPLMN accessed by the terminal is a shared PLMN.

In at least one embodiment of the present disclosure, the PLMN selection list is obtained by the AMF of the first VPLMN from the SoR application function AF network element, and the PLMN selection list is obtained by the SoR AF network element based on the location information of the terminal Sure.

As an optional embodiment, the method further includes:

Receive the updated SoR information sent by the SoR AF network element;

That is, after the terminal moves out of the coverage corresponding to the proxy fence information of the current SoR information, it is necessary to send a SoR transparent container (transparent container) to the UDM of the home PLMN, which carries the removal indication information (used to instruct the terminal to move out of the coverage corresponding to the geofence information). range), there are two ways:

Method 1, the terminal initiates the registration process, carrying the SoR transparent container;

In the second mode, the terminal sends an uplink Non-Access Stratum Transport (UL NAS Transport) message, which carries the SoR transparent container.

The first VPLMN sends the SoR transparent container to the UDM of the home PLMN, the UDM parses the content of the SoR transparent container, and requests the SoR information from the SoR-AF network element according to the instructions. When the SoR-AF determines that the current PLMN is a shared PLMN, it obtains the terminal location, Then the SoR information is calculated according to the terminal position and fed back to the UDM; the UDM sends the updated SoR information to the terminal, and the terminal uses the newly received SoR information to perform PLMN selection. In this way, the terminal can select the correct PLMN according to the SoR information provided by the home PLMN, thereby improving the selection efficiency of the PLMN.

As another optional embodiment, the method further includes:

Optionally, if the PLMN selection lists associated with different geo-fence information are different, the terminal needs to exclude the first VPLMN when performing PLMN reselection. That is, after the terminal moves out of the coverage area corresponding to any geo-fence information of the SoR information, it needs to trigger PLMN reselection; when the terminal performs PLMN reselection, it needs to exclude the current registered PLMN (ie the first VPLMN), that is, the terminal reselection The VPLMN initiates a registration request to obtain new SoR information and perform PLMN selection based on the new SoR information.

As an optional embodiment, the geo-fence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.

To sum up, in the embodiment of the present disclosure, the terminal sends the location information of the terminal from the AMF of the first VPLMN, so that the terminal with weak positioning capability or no positioning capability can select the correct VPLMN according to the location information obtained from the AMF of the first VPLMN , to improve the selection efficiency of PLMN.

As shown in FIG. 2 , an embodiment of the present disclosure further provides a method for selecting a public land mobile network PLMN, the method comprising:

Step 201, the access and mobility management function AMF of the first visited public land mobile network VPLMN receives the registration request sent by the terminal;

Step 202, in response to the registration request, the AMF of the first VPLMN sends a registration response message or a de-registration request to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or the de-registration request contains the location information of the terminal.

Optionally, the AMF of the first VPLMN may notify the terminal of its location information through a registration response message before accepting the registration request of the terminal; or, the AMF of the first VPLMN may accept the registration request of the terminal (that is, after the terminal is successfully registered) , initiate a deregistration (Deregistration) process, and inform the terminal of its location information through a deregistration request message.

As an optional embodiment, the method further includes:

The AMF of the first VPLMN acquires the location information of the terminal through the location management function LMF network element. Regardless of whether the terminal has a positioning function or not, when the terminal accesses the first VPLMN through a satellite, the AMF of the first VPLMN can obtain the location information of the terminal through the LMF network element.

As an optional embodiment, the registration response message is a registration rejection message. Then, the terminal performs a PLMN reselection operation according to the location information of the terminal and the local PLMN selection information contained in the registration rejection message.

The AMF of the first VPLMN sends roaming guidance SoR information to the terminal. The SoR information is obtained by the AMF of the first VPLMN through the SoR application function (SoR-AF) network element of the home PLMN. Wherein, the SoR-AF network element determines the SoR information based on the location information of the terminal. In this case, the terminal can select the correct PLMN according to the SoR information provided by the home PLMN, so as to improve the selection efficiency of the PLMN.

As an optional embodiment, the geo-fence information exists in two forms, which are:

For form 1, the SoR information includes a plurality of geo-fence information, and a PLMN selection list corresponding to each of the geo-fence information; or, the SoR information includes a geo-fence information covering the location of the terminal, And, a PLMN selection list corresponding to the geofence information.

For form 2, the SoR information is associated with at least one geofence information. After the AMF of the first VPLMN sends the roaming guidance SoR information to the terminal, the method further includes:

The AMF of the first VPLMN sends at least one geofence information associated with the SoR information.

For example, if the terminal does not have the positioning capability, the SoR-AF network element can only provide the geo-fence information covering the location of the terminal and the PLMN selection list within the geographic range corresponding to the geo-fence information; or, if the terminal does not have the positioning capability, the SoR-AF - The AF network element may only provide SoR information associated with the geo-fence information covering the location of the terminal. In this case, the SoR-AF network element is required to obtain the terminal's positioning capability information (ie, whether the terminal has the positioning capability), or the AMF or UDM is required to actively report the terminal's positioning capability information. For another example, when the terminal accesses the shared PLMN, it can only obtain the PLMN selection list of the area where the terminal is located, so as to avoid providing the terminal with unnecessary PLMN selection information (for example, the area that the terminal will not reach at present).

In at least one embodiment of the present disclosure, the geo-fence information and SoR information are obtained by the AMF of the first VPLMN from the SoR application function AF network element, wherein the geo-fence information and SoR information are obtained by the SoR AF network The element is determined based on the location information of the terminal after determining that the first VPLMN accessed by the terminal is a shared PLMN.

country code;

area code;

Longitude and latitude boundary information.

In at least one embodiment of the present disclosure, the SoR information may only include a PLMN selection list, and is not associated with the geo-fence information, but in this case, the AMF needs to send the terminal's information determined by the LMF in addition to the SoR information. Location information, so that the terminal can select the correct VPLMN according to the accurate location information and SoR information.

To sum up, the AMF of the first VPLMN sends the location information of the terminal to the terminal in response to the registration request of the terminal, so that the terminal with weak positioning capability or no positioning capability can select the correct VPLMN according to the location information obtained from the first network element, Improve the selection efficiency of PLMN.

In order to describe the PLMN selection method provided by the embodiments of the present disclosure more clearly, the embodiments of the present disclosure will be described in detail below with reference to several examples.

Example 1, the registration request of the terminal with positioning capability is rejected or the terminal is deregistered after registration, as shown in Figure 3:

Step 31, the terminal selects VPLMN1 to register according to its own location and existing PLMN selector information.

Step 32, in order to confirm the location of the terminal, the AMF in the VPLMN1 requests the LMF for the location information of the terminal, carries an indication in the request, and requests the LMF to provide the area code or country code where the terminal is currently located.

Step 33a, according to the terminal location or area information, it is determined that the terminal is not allowed to access this VPLMN1, then the request is rejected, and the accurate location information of the terminal (obtained from the LMF) is given in the rejection message, including the current area code or country where the terminal is located. code, or geographic location information.

Or in step 33b, after the AMF accepts the registration request of the terminal, it determines that the terminal is not allowed to access the VPLMN1 according to the terminal location or area information, then initiates the cancellation registration process, and sends the terminal to the registration request to carry the accurate location information of the terminal. (obtained from LMF), including the area code or country code where the terminal is currently located, or geographic location information.

Step 34, the terminal re-executes the PLMN selection according to the acquired location information. The terminal initiates the registration process after selecting the correct VPLMN2.

Step 35, the AMF of VPLMN2 needs to obtain the area code or country code where the terminal is currently located from the LMF to determine whether the terminal is allowed to access.

Step 36, after the terminal accesses the VPLMN2, the SoR update process may be triggered.

Example 2, the terminal registration request is accepted, as shown in Figure 4:

Step 41, the terminal selects VPLMN1 for registration according to its own location and existing PLMN selector information.

Step 42, in order to confirm the location of the terminal, the AMF in the VPLMN1 requests the LMF for the location information of the terminal. The request carries an indication and requests the LMF to provide the area code or country code where the terminal is currently located.

Step 43, the AMF in the VPLMN1 determines that the terminal is allowed to access this VPLMN1 according to the location information of the terminal, and acquires the terminal subscription information from the HPLMN.

Step 44, the UDM determines that the SoR information needs to be sent according to the indication of the subscription information of the terminal, and sends a request to update the SoR information to the SoR-AF.

Step 45: When the SoR-AF determines that the PLMN1 is a shared PLMN ID (beginning with 9xx), it acquires the terminal location, and then calculates the SoR information according to the terminal location. SoR-AF also needs to calculate the area information where the SoR information is valid as a geofence;

Step 46, the SoR-AF sends the SoR information (note: the SoR information includes geo-fence information) to the terminal through the UDM and AMF, or the SoR-AF sends the SoR information through the UDM and AMF (note: the SoR information does not include the geo-fence information) to the terminal. Geofence information) and the geofence information associated with the SoR information are sent to the terminal together;

Step 47, if the SoR information has only one geo-fence information associated with it, the terminal does not need to locate, and directly performs PLMN selection according to the SoR information; otherwise, the terminal needs to locate itself, and determine a geo-fence information according to its own position, and then use the determined location. The SoR information associated with the geofence information performs PLMN selection.

Example 3, registration of a terminal without positioning capability, as shown in Figure 5:

Step 51, the terminal without positioning capability cannot select a PLMN according to the location information, so it can only select a VPLMN, such as VPLMN1, according to the saved PLMN selector, and send a registration request.

Step 52, the AMF1 in the VPLMN1 obtains the location information of the terminal from the LMF after determining that the terminal has no positioning capability according to the capability of the terminal, or according to the display indication of the terminal.

Step 53, AMF1 judges whether to allow access according to the location information of the terminal, and feeds back its location information to the terminal in the registration acceptance or rejection registration message. The terminal is located in a specific international area) or geographic location information (the terminal is located in an area without a specific area code).

Step 54, the terminal selects an appropriate VPLMN2 according to the location information fed back by the AMF1 and sends a registration request.

Step 55, same as step 52, the AMF2 in the VPLMN2 acquires the location information of the terminal from the LMF.

Step 56, in addition to feeding back its location information to the terminal, the AMF2 may also feed back SoR information according to Example 2.

Example 4: After the terminal moves out of the coverage area corresponding to the geo-fencing (Geo-Fencing) information, PLMN reselection is performed, as shown in Figure 6:

Step 61 , after the terminal moves and is not in any Geo-Fencing area in the current SoR, PLMN reselection needs to be triggered.

Step 62, when the terminal performs PLMN reselection, it needs to exclude the current registered PLMN;

Step 63, the registration process; the same as steps 41-46 in the second example;

Step 64, the terminal uses the newly received SoR information to perform PLMN reselection.

Example 5: After the terminal moves out of the coverage area corresponding to the Geo-Fencing information, the notification SoR-AF is displayed, as shown in Figure 7:

After the terminal moves out of any Geo-Fencing area in the current SoR, it needs to send the SoR transparent container to the UDM, which carries the Geo-Fencing indication to move out. There are two ways:

Step 71a, the terminal initiates the registration process, carrying the SoR transparent container;

Step 71b, the terminal sends a UL NAS Transport message, which carries the SoR transparent container.

Step 72, the AMF sends the SoR transparent container to the UDM of the HPLMN.

Step 73, the UDM parses the content of the SoR transparent container, and requests SoR information from the SoR-AF according to the instruction.

Step 74: When the SoR-AF determines that the current PLMN is a shared PLMN ID (beginning with 9xx), it acquires the terminal location, and then calculates the SoR information and geofence information according to the terminal location. The details are the same as step 45 in Example 2.

Step 75, the SoR-AF sends the updated SoR information to the terminal through the UDM and the AMF.

Step 76, the terminal uses the newly received SoR information to perform PLMN selection.

In the embodiment of the present disclosure, the terminal acquires the location information and/or SoR information of the terminal from the AMF of the first VPLMN, so that the terminal with weak positioning capability or no positioning capability can select the correct VPLMN according to the location information acquired from the AMF, and /or, enabling the terminal to select the correct PLMN according to the SoR information provided by the home PLMN, thereby improving the selection efficiency of the PLMN.

As shown in FIG. 8 , an embodiment of the present disclosure further provides a public land mobile network PLMN selection apparatus, which is applied to a terminal, and the apparatus includes:

The first sending unit 801 is used to send a registration request to the access and mobility management function AMF of the first visited public land mobile network VPLMN;

A first receiving unit 802, configured to receive a registration response message or a de-registration request sent by the AMF of the first VPLMN, where the registration response message or the de-registration request includes the location information of the terminal;

The first reselection unit 803 is configured to perform a PLMN reselection operation according to the location information.

As an optional embodiment, if the registration response message is a registration rejection message, the first reselection unit includes:

As an optional embodiment, if the registration response message is a registration permission message, after successfully registering with the first VPLMN according to the registration response message, the apparatus further includes:

The first reselection unit includes:

As an optional embodiment, the SoR information includes a plurality of geo-fence information, and a PLMN selection list corresponding to each of the geo-fence information;

The second reselection subunit is further used for:

As an optional embodiment, the SoR information includes a geo-fence information covering the location of the terminal, and a PLMN selection list corresponding to the geo-fence information;

The second reselection subunit is further used for:

As an optional embodiment, after receiving the roaming guidance SoR information sent by the AMF of the first VPLMN, the apparatus further includes:

The 4th receiving unit is used for receiving at least one geo-fence information associated with the SoR information sent by the AMF of the first VPLMN;

The second reselection subunit is further used for:

If the number of associated geo-fence information is greater than one, select the geo-fence information covering the location information of the terminal from the associated geo-fence information according to the location information, and correspond to the geo-fence information according to the selected geo-fence information. The SoR information performs PLMN reselection operation.

As an optional embodiment, the geo-fence information and SoR information are obtained by the AMF of the first VPLMN from the SoR application function AF network element, wherein the geo-fence information and SoR information are obtained by the SoR AF network element in the It is determined that the first VPLMN accessed by the terminal is determined based on the location information of the terminal after the shared PLMN.

As an optional embodiment, the PLMN selection list is obtained by the AMF of the first VPLMN from the SoR application function AF network element, and the PLMN selection list is determined by the SoR AF network element based on the location information of the terminal.

As an optional embodiment, the device further includes:

country code;

area code;

Longitude and latitude boundary information.

As an optional embodiment, the location information of the terminal is acquired by the AMF of the first VPLMN through the location management function LMF network element.

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

In the embodiment of the present disclosure, the terminal obtains the location information of the terminal from the AMF of the first VPLMN, so that the terminal with weak positioning capability or no positioning capability can select the correct VPLMN according to the location information obtained from the AMF, thereby improving the selection efficiency of the PLMN.

The method and the device are conceived based on the same application. Since the principles of the method and the device for solving the problem are similar, the implementation of the device and the method can be referred to each other, and repeated descriptions will not be repeated here.

As shown in FIG. 9 , an embodiment of the present disclosure further provides a terminal, including a memory 920, a transceiver 910, and a processor 900:

The memory 920 is used to store computer programs; the transceiver 910 is used to send and receive data under the control of the processor 900; the processor 900 is used to read the computer programs in the memory 920 and perform the following operations:

As an optional embodiment, if the registration response message is a registration rejection message, the processor 900 is further configured to read the computer program in the memory 920 and perform the following operations:

As an optional embodiment, if the registration response message is a registration permission message, after the terminal successfully registers with the first VPLMN according to the registration response message, the processor 900 is further configured to read the computer program in the memory 920 and execute the following operate:

receiving roaming guidance SoR information sent by the AMF of the first VPLMN;

The processor 900 is further configured to read the computer program in the memory 920 and perform the following operations:

As an optional embodiment, after receiving the roaming guidance SoR information sent by the AMF of the first VPLMN, the processor 900 is further configured to read the computer program in the memory 920 and perform the following operations:

As an optional embodiment, the processor 900 is further configured to read the computer program in the memory 920 and perform the following operations:

If it is determined to move out of the coverage corresponding to the geo-fence information, then send out indication information to the SoR AF network element;

Receive the updated SoR information sent by the SoR AF network element;

country code;

area code;

Longitude and latitude boundary information.

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

9, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 900 and various circuits of memory represented by memory 920 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 910 may be a number of elements, including transmitters and receivers, providing means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like Transmission medium. For different user equipments, the user interface 930 may also be an interface capable of externally connecting a desired device, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 900 in performing operations.

Optionally, the processor 900 may be a central processing unit (central processing unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable Logic device (Complex Programmable Logic Device, CPLD), the processor can also use a multi-core architecture.

The processor is configured to execute any one of the methods provided by the embodiments of the present disclosure according to the obtained executable instructions by invoking the computer program stored in the memory. The processor and memory may also be physically separated.

The method and the terminal are conceived based on the same application. Since the principles of the method and the terminal for solving problems are similar, the implementation of the terminal and the method can be referred to each other, and repeated descriptions will not be repeated.

As shown in FIG. 10 , an embodiment of the present disclosure further provides an apparatus for selecting a public land mobile network PLMN, which is applied to the AMF of the first VPLMN, and the apparatus includes:

A second receiving unit 1001, configured to receive a registration request sent by a terminal;

The second sending unit 1002 is configured to, in response to the registration request, send a registration response message or a de-registration request to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or the de-registration request includes location information of the terminal.

As an optional embodiment, the registration response message is a registration rejection message.

or,

As an optional embodiment, after sending the roaming guidance SoR information to the terminal, the apparatus further includes:

country code;

area code;

Longitude and latitude boundary information.

As an optional embodiment, the device further includes:

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

In the embodiment of the present disclosure, the AMF of the first VPLMN sends the location information of the terminal to the terminal in response to the registration request of the terminal, so that the terminal with weak positioning capability or no positioning capability can select the correct VPLMN according to the location information obtained from the AMF, Improve the selection efficiency of PLMN.

As shown in FIG. 11 , an embodiment of the present disclosure further provides an AMF, where the AMF is an AMF of a first VPLMN, including a memory 1120, a transceiver 1110, and a processor 1100:

The memory 1120 is used to store computer programs; the transceiver 1110 is used to send and receive data under the control of the processor 1100; the processor 1100 is used to read the computer program in the memory 1120 and perform the following operations:

Receive the registration request sent by the terminal;

As an optional embodiment, if the registration response message is a registration permission message, after the terminal successfully registers with the first VPLMN according to the registration response message, the processor 1100 is further configured to read the computer program in the memory 1120 and execute the following operate:

Send roaming guidance SoR information to the terminal.

or,

As an optional embodiment, after sending the roaming guidance SoR information to the terminal, the processor 1100 is further configured to read the computer program in the memory 1120 and perform the following operations:

country code;

area code;

Longitude and latitude boundary information.

As an optional embodiment, the processor 1100 is further configured to read the computer program in the memory 1120 and perform the following operations:

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.

11, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 1100 and various circuits of memory represented by memory 1120 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 1110 may be a number of elements, including a transmitter and a receiver, providing means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like. The processor 1100 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1100 in performing operations.

The processor 1100 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a complex programmable logic device (Complex). Programmable Logic Device, CPLD), the processor can also adopt a multi-core architecture.

The method and the network element are conceived based on the same application. Since the principles of the method and the network element for solving problems are similar, the implementation of the network element and the method can be referred to each other, and the repetition will not be repeated.

It should be noted that the division of units in the embodiments of the present disclosure is schematic, and is only a logical function division, and other division methods may be used in actual implementation. In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a processor-readable storage medium. Based on this understanding, the technical solutions of the present disclosure can be embodied in the form of software products in essence, or the parts that contribute to related technologies, or all or part of the technical solutions, and the computer software products are stored in a storage medium, Several instructions are included to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present disclosure. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

Embodiments of the present disclosure further provide a processor-readable storage medium, where a computer program is stored in the processor-readable storage medium, and the computer program is used to cause the processor to execute the above method; the processor The readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic memory (such as floppy disk, hard disk, magnetic tape, Magneto-Optical Disk (MO), etc.), optical memory ( For example, Compact Disk (CD), Digital Versatile Disc (DVD), Blu-ray Disc (BD), High-Definition Versatile Disc (HVD), etc.), and semiconductor memory ( For example, ROM, Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Non-volatile Memory (NAND FLASH) , Solid State Disk (Solid State Disk or Solid State Drive, SSD)), etc.

As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the processor-readable memory result in the manufacture of means including the instructions product, the instruction means implements the functions specified in the flow or flow of the flowchart and/or the block or blocks of the block diagram.

These processor-executable instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process that Execution of the instructions provides steps for implementing the functions specified in the flowchart or blocks and/or the block or blocks of the block diagrams.

It should be noted that it should be understood that the division of the above modules is only a division of logical functions, and in actual implementation, all or part of them may be integrated into a physical entity, or may be physically separated. And these modules can all be implemented in the form of software calling through processing elements; they can also all be implemented in hardware; some modules can also be implemented in the form of calling software through processing elements, and some modules can be implemented in hardware. For example, the determination module may be a separately established processing element, or may be integrated into a certain chip of the above-mentioned device to be implemented, in addition, it may also be stored in the memory of the above-mentioned device in the form of program code, and a certain processing element of the above-mentioned device may Call and execute the function of the above determined module. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together, and can also be implemented independently. The processing element described here may be an integrated circuit with signal processing capability. In the implementation process, each step of the above-mentioned method or each of the above-mentioned modules can be completed by an integrated logic circuit of hardware in the processor element or an instruction in the form of software.

For example, each module, unit, sub-unit or sub-module may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuit (ASIC), or, one or Multiple microprocessors (digital signal processors, DSP), or, one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), etc. For another example, when one of the above modules is implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processors that can call program codes. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

The terms "first", "second", etc. in the description and claims of the present disclosure are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It is to be understood that the data so used can be interchanged under appropriate circumstances such that the embodiments of the disclosure described herein are implemented in sequences other than those illustrated or described herein, for example. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices. In addition, the use of "and/or" in the specification and the claims means at least one of the linked objects, such as A and/or B and/or C, is meant to include A alone, B alone, C alone, and both A and B Existence, B and C exist, A and C exist, and 7 cases where A, B, and C all exist. Similarly, the use of "at least one of A and B" in this specification and in the claims should be understood to mean "A alone, B alone, or both A and B present."

It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit and scope of the present disclosure. Thus, provided that these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is also intended to cover such modifications and variations.

Claims

A public land mobile network PLMN selection method, the method comprising:

The terminal sends a registration request to the access and mobility management function AMF of the first visited public land mobile network VPLMN;

The terminal receives a registration response message or a deregistration request sent by the AMF of the first VPLMN, and the registration response message or the deregistration request includes the location information of the terminal;

The terminal performs a PLMN reselection operation according to the location information.
The method according to claim 1, wherein, if the registration response message is a registration rejection message, the terminal performs a PLMN reselection operation according to the location information, specifically comprising:

The terminal performs a PLMN reselection operation according to the location information of the terminal and the local PLMN selection information contained in the registration rejection message.
The method according to claim 1, wherein, if the registration response message is a registration permission message, after the terminal successfully registers with the first VPLMN according to the registration response message, the method further comprises:

The terminal receives the roaming guidance SoR information sent by the AMF of the first VPLMN;

The terminal performs a PLMN reselection operation according to the location information, which specifically includes:

The terminal performs a PLMN reselection operation according to the location information and the SoR information.
The method according to claim 3, wherein the SoR information includes a plurality of geo-fence information, and a PLMN selection list corresponding to each of the geo-fence information;

The terminal performs a PLMN reselection operation according to the location information and the SoR information, specifically including:

The terminal selects one geo-fence information from the plurality of geo-fence information according to the location information, and performs a PLMN reselection operation according to the PLMN selection list corresponding to the selected geo-fence information.
The method according to claim 3, wherein the SoR information includes a geo-fence information covering the location of the terminal, and a PLMN selection list corresponding to the geo-fence information;

The terminal performs a PLMN reselection operation according to the location information and the SoR information, specifically including:

The terminal performs a PLMN reselection operation according to the PLMN selection list corresponding to the geo-fence information.
The method according to claim 3, after the terminal receives the roaming guidance SoR information sent by the AMF of the first VPLMN, the method further comprises:

receiving, by the terminal, at least one geo-fence information associated with the SoR information and sent by the AMF of the first VPLMN;

The terminal performs a PLMN reselection operation according to the location information and the SoR information, specifically including:

If the number of associated geofence information is 1, the terminal performs a PLMN reselection operation according to the SoR information;

If the number of associated geo-fence information is greater than one, the terminal selects the geo-fence information covering the location information of the terminal from the plurality of associated geo-fence information according to the location information, and selects the geo-fence information covering the location information of the terminal according to the selected geo-fence information. The SoR information corresponding to the fence information performs the PLMN reselection operation.
The method according to any one of claims 4 to 6, wherein the geofence information and SoR information are obtained by the AMF of the first VPLMN from a SoR application function AF network element, wherein the geofence information and SoR information The information is determined by the SoR AF network element based on the location information of the terminal after determining that the first VPLMN accessed by the terminal is a shared PLMN.
The method according to any one of claims 4 to 6, wherein the PLMN selection list is obtained by the AMF of the first VPLMN from a SoR application function AF network element, and the PLMN selection list is obtained by the SoR AF network element Determined based on location information of the terminal.
The method of claim 7, further comprising:

If the terminal determines to move out of the coverage corresponding to the geo-fence information, it sends the move out indication information to the SoR AF network element;

Receive the updated SoR information sent by the SoR AF network element;

PLMN reselection operation is performed according to the updated SoR information.
The method of claim 7, further comprising:

If the terminal is not within the coverage area corresponding to any geo-fence information in the SoR information, the terminal performs a PLMN reselection operation according to the local PLMN selection information.
The method of any one of claims 4 to 6, wherein the geofence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.
The method according to claim 1 or 7, wherein the location information of the terminal is acquired by the AMF of the first VPLMN through a location management function LMF network element.
The method according to claim 12, wherein the location information of the terminal includes at least one of the following:

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.
A public land mobile network PLMN selection method, the method comprising:

The access and mobility management function AMF of the first visited public land mobile network VPLMN receives the registration request sent by the terminal;

In response to the registration request, the AMF of the first VPLMN sends a registration response message or a de-registration request to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or de-registration request includes the the location information of the terminal.
The method of claim 14, wherein the registration response message is a registration rejection message.
The method according to claim 14, wherein, if the registration response message is a registration permission message, after the terminal successfully registers with the first VPLMN according to the registration response message, the method further comprises:

The AMF of the first VPLMN sends roaming guidance SoR information to the terminal.
The method of claim 16, wherein the SoR information includes a plurality of geo-fence information, and a PLMN selection list corresponding to each of the geo-fence information;

or,

The SoR information includes a geo-fence information covering the location of the terminal, and a PLMN selection list corresponding to the geo-fence information.
The method according to claim 16, after the AMF of the first VPLMN sends the roaming guidance SoR information to the terminal, the method further comprises:

The AMF of the first VPLMN sends at least one geofence information associated with the SoR information to the terminal.
The method according to claim 17 or 18, wherein the geofence information and SoR information are obtained by the AMF of the first VPLMN from the SoR application function AF network element, wherein the geofence information and SoR information are obtained by the The SoR AF network element is determined based on the location information of the terminal after determining that the first VPLMN accessed by the terminal is a shared PLMN.
The method of claim 17 or 18, wherein the PLMN selection list is obtained by the AMF of the first VPLMN from a SoR application function AF network element, and the PLMN selection list is obtained by the SoR AF network element based on the The location information of the terminal is determined.
The method of claim 17 or 18, wherein the geofence information includes at least one of the following:

country code;

area code;

Longitude and latitude boundary information.
The method according to claim 14, before sending a registration response message or a deregistration request to the terminal, the method further comprises:

The AMF of the first VPLMN acquires the location information of the terminal through the location management function LMF network element.
The method according to claim 22, wherein the location information of the terminal includes at least one of the following:

the area code of the area where the terminal is currently located;

the country code of the region where the terminal is currently located;

Geographic location information of the terminal.
A public land mobile network PLMN selection device, the device comprising:

a first sending unit, configured to send a registration request to the access and mobility management function AMF of the first visited public land mobile network VPLMN;

a first receiving unit, configured to receive a registration response message or a de-registration request sent by the AMF of the first VPLMN, where the registration response message or the de-registration request includes the location information of the terminal;

A first reselection unit, configured to perform a PLMN reselection operation according to the location information.
A terminal, comprising a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:

Send a registration request to the access and mobility management function AMF of the first visited public land mobile network VPLMN;

Receive a registration response message or a de-registration request sent by the AMF of the first VPLMN, where the registration response message or the de-registration request includes the location information of the terminal;

A PLMN reselection operation is performed according to the location information.
A public land mobile network PLMN selection device, the device comprising:

a second receiving unit, configured to receive a registration request sent by the terminal;

The second sending unit is configured to, in response to the registration request, send a registration response message or a de-registration request to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or de-registration request includes the the location information of the terminal.
An access and mobility management function AMF, the AMF is the AMF of the first VPLMN, including a memory, a transceiver, and a processor:

a memory for storing a computer program; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:

Receive the registration request sent by the terminal;

In response to the registration request, a registration response message or a de-registration request is sent to the terminal according to the tracking area information or cell information where the terminal is located; the registration response message or the de-registration request includes the location information of the terminal.
A processor-readable storage medium storing a computer program for causing the processor to execute the method according to any one of claims 1 to 13; or, The computer program for causing the processor to perform a method as claimed in any one of claims 14 to 23.