CN114257677A

CN114257677A - Communication method and device

Info

Publication number: CN114257677A
Application number: CN202011018069.9A
Authority: CN
Inventors: 金辉; 裘风光
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2022-03-29
Also published as: WO2022062668A1

Abstract

The application relates to a communication method and equipment. Receiving a first call request; displaying incoming call information on a display unit according to the first call request, wherein the incoming call information comprises: and the information is used for prompting the calling equipment to be in the international roaming state. Through the method provided by the embodiment of the application, the called party can know the fraud call as long as the calling party is in the international roaming state, so that corresponding prompt measures can be provided, and the suspected fraud call can be determined without calling the calling party for many times, so that the efficiency of determining the fraud call is higher.

Description

Communication method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a communication method and device.

Background

Generally, if a user in China is out of the country, the user rarely continues to make a call by using a mobile phone number in China. Therefore, if the phone number is a domestic phone number, but the phone number is used abroad, the phone number is probably a fraud phone. However, to determine whether an incoming call is a fraudulent call, the incoming call number is typically dialed multiple times so that the incoming call number is determined to be a fraudulent call. Thus, for the user to receive the phone call, there may be a need to receive multiple fraudulent calls, or there may be multiple users receiving fraudulent calls. It can be seen that the current manner of determining fraudulent calls is inefficient and may result in the personal and property security of the user being compromised.

Disclosure of Invention

The embodiment of the application provides a communication method and equipment, which are used for improving the efficiency of determining fraud calls and guaranteeing the personal and property safety of users.

In a first aspect, a first communication method is provided, the method including: receiving a first call request; displaying incoming call information on a display unit according to the first call request, wherein the incoming call information comprises: and the information is used for prompting the calling equipment to be in the international roaming state.

The method may be performed by a first communication device, which may be a communication apparatus or a communication device, e.g. a chip, capable of supporting the communication apparatus to implement the functionality required for the method. Illustratively, the first communication device is a terminal device, or a chip disposed in the terminal device, or other components for implementing functions of the terminal device. In the following description, the first communication device is taken as an example of a terminal device, for example, a second terminal device, and the second terminal device is also a called device.

The second terminal device receives the first call request, and then can prompt the user for incoming call, for example, output incoming call information, and the incoming call information can prompt the calling device to be in an international roaming state, so that the user can be prompted through the incoming call information to prevent the user from being cheated. Therefore, through the mode provided by the embodiment of the application, the called party can know the fraud call as long as the calling party is in the international roaming state, so that corresponding prompt measures can be provided, the efficiency of determining the fraud call is higher, the fraud call can be determined only by dialing once without dialing for many times, and the method is more effective for guaranteeing personal and property safety of the user.

With reference to the first aspect, in a first optional implementation manner of the first aspect, the first call request further includes first information, where the first information is used to indicate that the calling device is in an international roaming state.

The first call request may include first information indicating that the calling device is in the international roaming state, so that the incoming call information output by the second terminal device may include information for prompting that the calling device is in the international roaming state.

With reference to the first optional implementation manner of the first aspect, in a second optional implementation manner of the first aspect, the first information is used to indicate that the calling device is in an international roaming state, and the method includes:

the first information comprises a label indicating that the calling equipment is in an international roaming state; or, the first information is used for indicating a roaming place of the calling device.

The first information indicates that the first terminal equipment is in an international roaming state, and different indication modes are available. For example, the first information may indicate a roaming place of the first terminal device, which is equivalent to implicitly indicating that the first terminal device is in an international roaming state, and also indicate the roaming place, so that the indicated content is richer, and it is more beneficial for the user to determine whether the current incoming call is a fraud call; alternatively, the first information may comprise a tag, for example, referred to as a second tag, and the second tag may indicate that the first terminal device is in the international roaming state, so that the first information includes less content, which can reduce signaling overhead.

With reference to the second optional implementation manner of the first aspect, in a third optional implementation manner of the first aspect, the first information is used to indicate a roaming destination of the calling device, and includes:

the first information is used for indicating the name of the roaming place of the calling equipment; or, the first information is used for indicating a country code of a roaming place of the calling device; or, the first information is used for indicating the name of the roaming operator of the calling device; or the first information is used for indicating the identification of the PLMN of the roaming place of the calling equipment.

The first information is to indicate the roaming place of the first terminal device, and there are various indication manners, and the above manners are only some examples.

With reference to the first alternative implementation manner of the first aspect, the second alternative implementation manner of the first aspect, or the third alternative implementation manner of the first aspect, in a fourth alternative implementation manner of the first aspect,

the first information is carried in a first field, wherein the first field is a field which is included in the first call request and has an Asserted Identity P-Asserted-Identity or is newly added from a from header field; or, the first information is carried in a first message header, and the first message header is a message header newly added in the first call request; or, the first information is carried in a second field, the second field is a field in the P-Asserted-Identity included in the first call request, the second field is used for carrying the number of the calling device, and the first information is used for indicating the country code of the roaming place of the calling device; or, the first information is carried in a third field, the third field is a field in a from header field included in the first call request, and the first information is used for indicating a country code of a roaming place of the calling device.

The first call request is obtained in accordance with the second call request. For example, a first field is added to a header (e.g., a P-Asserted-Identity or from header field) included in the second call request to carry the first information, so that no additional header needs to be added to the second call request, which helps to simplify the structure of the second call request. Or, the original message header of the second call request is not required to be changed, but the message header (the first message header) is newly added in the second call request to carry the first information, so that the influence on other message headers of the second call request can be reduced. Or, the first information may be added to a corresponding field (for example, the second field or the third field) in a header included in the second call request, which is simpler to implement, without adding a new header or a new field in the second call request, and only by extending and carrying the first information through the original field.

With reference to the first aspect or any optional implementation manner of the first aspect to the fourth optional implementation manner of the first aspect, in a fifth optional implementation manner of the first aspect, the incoming call information includes information used for prompting that the calling device is in an international roaming state, and the method includes:

the incoming call information comprises information used for prompting that the calling equipment is in an international roaming state; or the incoming call information comprises information used for prompting the name of the roaming place of the calling equipment; or, the incoming call information includes information for prompting a country code of a roaming place of the calling device; or the incoming call information comprises information used for prompting the name of a roaming place operator of the calling equipment; or the incoming call information comprises information for prompting the identifier of the PLMN of the roaming place of the calling equipment; or the incoming call information comprises information used for prompting a service place and a home place of the calling equipment.

There are various prompting modes for prompting the calling device to be in the international roaming state by the incoming call information, and the above modes are only some examples.

With reference to the first aspect or any optional implementation manner of the first aspect to the fifth optional implementation manner of the first aspect, in a sixth optional implementation manner of the first aspect, the incoming call information includes a number of the calling device, and a home of the number is national;

the displaying the incoming call information on the display unit includes:

displaying the number of the calling equipment and a roaming label of the calling equipment in an international roaming state on the display unit; or, the number of the calling equipment and the roaming place of the calling equipment are displayed on the display unit; or, displaying the number of the calling device, the roaming place of the calling device and the label of the electronic device in the international roaming state on the display unit; or, the number of the calling equipment is displayed on the display unit, and the country code of the roaming place of the calling equipment is displayed in front of the number of the calling equipment; or, displaying the number of the calling device, the home location of the calling device and the roaming location of the calling device on the display unit; or, displaying the number of the calling device and the name of the operator of the roaming place of the calling device on the display unit; or, displaying on the display unit a number of the calling device and an indication of a suspected fraud phone.

One way of outputting the incoming call information by the second terminal device is to display the incoming call information on a display unit of the second terminal device. The incoming call information displayed by the second terminal device may have different forms, as just some examples.

With reference to the first aspect or any one of the first optional implementation manner of the first aspect to the sixth optional implementation manner of the first aspect, in a seventh optional implementation manner of the first aspect, the displaying the incoming call information on the display unit includes:

determining that the number of the calling device and the valid number stored in the called device fail to be matched, and displaying the incoming call information on the display unit, otherwise, displaying the number of the calling device on the display unit; or, determining that the number of the calling equipment is not stored locally, and displaying the incoming call information on the display unit, otherwise, displaying the number of the calling equipment on the display unit.

Although the domestic number is taken to be used abroad and is a fraud telephone with a high probability, the situation that some users take the domestic number to be used abroad is not excluded, for example, some users encounter an emergency situation abroad, and when the users do not apply for foreign numbers for a while, the users may dial the telephone through the domestic number. In order to prevent this, the second terminal device may first match the number of the calling device with a valid number stored in the second terminal device, or the second terminal device may first determine whether the number of the calling device is stored locally. If the number of the calling device is successfully matched with one or more valid numbers stored in the second terminal device, or the number of the calling device is stored locally, the second terminal device can normally output the incoming call information, namely, the second terminal device does not prompt that the calling device is abnormal any more, and the user can normally answer the call, so that the user can avoid missing normal and possibly more important incoming calls. The valid number may refer to a number that is stored by the second terminal device and is not included in a blacklist of the second terminal device.

With reference to the seventh optional implementation manner of the first aspect, in an eighth optional implementation manner of the first aspect, the method further includes:

matching the characters of the rear preset bits of the second field with the effective number stored in the called equipment; or, matching the characters of the rear preset bits of the second field with the number locally stored by the called device.

For example, the first information is carried in a second field, the second field is a field in the P-Asserted-Identity included in the first call request, the second field is used for carrying the number of the calling device, and the first information is used for indicating the country code of the roaming place of the calling device. In this case, the character of the last preset digit in the second field (or the third field) is, for example, an incoming call number, and the other characters except the character of the last preset digit in the second field (or the third field) do not belong to the incoming call number, for example, belong to the prompt message, or belong to the first message, for example, MCC, and the terminal device generally does not store the MCC when storing the number, so if the second field (or the third field) is matched in the order from front to back, or the matching content includes other systems except the character of the last preset digit in the second field (or the third field), the matching may fail, and therefore, the matching is performed in the order from back to front, or the matching character of the last preset digit can improve the success rate of matching.

With reference to the first aspect or any one of the first optional implementation manner of the first aspect to the eighth optional implementation manner of the first aspect, in a ninth optional implementation manner of the first aspect, after the receiving the first call request, the method further includes:

and if the response operation to the first call request is not detected, outputting missed call information according to the first call request, wherein the missed call information comprises information for prompting that the calling equipment is in an international roaming state.

If the second terminal device does not perform an operation of answering the incoming call, that is, the user does not answer the incoming call, that is, the second terminal device does not detect a response operation to the first call request, optionally, the second terminal device may further output missed call information, and the missed call information is output in a manner, for example, by displaying the missed call information through the display unit. For example, the missed call information may also include prompt information, and the content of the prompt information included in the missed call information is similar to the content of the prompt information included in the previous call information, so that the content of the missed call information displayed by the second terminal device is also similar to the content of the displayed call information. Namely, even if the user temporarily fails to answer the call, the second terminal device can prompt the user through the missed call information, and the user does not need to call back the suspected fraud calls, so that the telephone charge is saved, and the personal and property safety of the user can be guaranteed.

In a second aspect, a second communication method is provided, the method comprising: receiving a second call request from the first terminal device; determining that the first terminal device is in an international roaming state, and adding first information in the second call request to obtain a third call request, wherein the first information is used for indicating that the first terminal device is in the international roaming state; and sending the third call request to the second terminal equipment.

The method may be performed by a second communication device, which may be a communication apparatus or a communication device, e.g. a chip, capable of supporting the communication apparatus to perform the functions required by the method. Illustratively, the second communication device is a network device, or a chip disposed in the network device, or other components for implementing functions of the network device. In the following description, the second communication device is taken as an example of a network device. Illustratively, the network device is an S-CSCF or an AS.

In this embodiment, if it is determined that the first terminal device is in the international roaming state, the second communication device may add the first information to the second call request to indicate that the first terminal device is in the international roaming state. The second terminal device is, for example, a called party, and the second terminal device can prompt the user through the incoming call information to prevent the user from being cheated. Therefore, through the mode provided by the embodiment of the application, the called party can know the fraud call as long as the calling party is in the international roaming state, so that corresponding prompt measures can be provided, the efficiency of determining the fraud call is higher, the fraud call can be determined only by dialing once without dialing for many times, and the method is more effective for guaranteeing personal and property safety of the user.

With reference to the second aspect, in a first optional implementation manner of the second aspect, the first information is used to indicate that the first terminal device is in an international roaming state, and the method includes:

the first information comprises a label used for indicating that the first terminal equipment is in an international roaming state; or, the first information is used for indicating a roaming place of the first terminal device.

With reference to the first optional implementation manner of the second aspect, in a second optional implementation manner of the second aspect, the first information is used to indicate a roaming destination of the first terminal device, and includes:

the first information is used for indicating the name of the roaming place of the first terminal equipment; or, the first information is used to indicate a roaming place name of the first terminal device, and the first information further includes a roaming tag; or, the first information is used for indicating a country code of a roaming place of the first terminal device; or, the first information is used to indicate a roaming location operator name of the first terminal device; or the first information is used for indicating the identifier of the PLMN of the roaming place of the first terminal equipment.

With reference to the second aspect or the first optional implementation manner of the second aspect or the second optional implementation manner of the second aspect, in a third optional implementation manner of the second aspect, adding the first information to the second call request to obtain a third call request includes:

adding a first field in a P-Asserted-Identity or from header field included in the second call request to obtain the third call request, wherein the first field is used for bearing the first information; or, adding a first message header to the second call request to obtain the third call request, where the first message header is used to carry the first information; or, adding the first information to a second field in the P-Asserted-Identity included in the second call request to obtain the third call request, where the second field is used to carry the number of the first terminal device, and the first information is used to indicate the country code of the roaming destination of the first terminal device; or, the first information is added to a third field in a from header field included in the second call request to obtain the third call request, and the first information is used for indicating a country code of the roaming place of the first terminal device.

For example, a first field may be added to a header (e.g., a P-Asserted-Identity or from header field) included in the second call request to carry the first information, thereby eliminating the need to add an additional header to the second call request, which helps to simplify the structure of the second call request. Or, the original message header of the second call request is not required to be changed, but the message header (the first message header) is newly added in the second call request to carry the first information, so that the influence on other message headers of the second call request can be reduced. Or, the first information may be added to a corresponding field (for example, the second field or the third field) in a header included in the second call request, which is simpler to implement, without adding a new header or a new field in the second call request, and only by extending and carrying the first information through the original field.

With reference to the second aspect or any one of the first optional implementation manner of the second aspect to the third optional implementation manner of the second aspect, in a fourth optional implementation manner of the second aspect, the method further includes:

receiving a registration request message from the first terminal device;

sending a subscription information request message to a first core network device, wherein the subscription information request message is used for requesting subscription information of the first terminal device;

receiving first subscription information from the first core network device, where the first subscription information is subscription information of the first terminal device, and the first subscription information includes indication information, where the indication information is used to indicate that the first terminal device is in an international roaming state.

After receiving the registration request message of the first terminal device, the subscription information of the first terminal device may be requested, so that it can be determined that the first terminal device is in the international roaming state according to the subscription information of the first terminal device.

With reference to the fourth optional implementation manner of the second aspect, in a fifth optional implementation manner of the second aspect, the indicating information is used to indicate that the first terminal device is in an international roaming state, and the indicating information includes:

the indication information comprises a label used for indicating that the first terminal equipment is in an international roaming state; or, the indication information is used for indicating a roaming place of the first terminal device.

The indication information indicates that the first terminal device is in the international roaming state, and different indication modes are available. For example, the indication information may indicate a roaming place of the first terminal device, which is equivalent to implicitly indicating that the first terminal device is in an international roaming state, and also indicates the roaming place, so that the content of the indication is richer, and it is more beneficial for the user to determine whether the current incoming call is a fraudulent call; alternatively, the indication information may include a tag, for example, referred to as a first tag, and the first tag may indicate that the first terminal device is in the international roaming state, so that the indication information includes less content, which can reduce signaling overhead.

With reference to the fifth optional implementation manner of the second aspect, in a sixth optional implementation manner of the second aspect, the indicating information is used to indicate a roaming destination of the first terminal device, and includes:

the indication information is used for indicating the identifier of the PLMN of the network currently registered by the first terminal equipment; or, the indication information is used to indicate an identifier of a second core network device currently serving the first terminal device, where the identifier of the second core network device includes an identifier of a PLMN of a network to which the first terminal device is currently registered, or the identifier of the second core network device includes a country code of a roaming destination of the first terminal device, and the second core network device is used to provide a mobility management service for the first terminal device; or, the indication information is used for indicating a country code of the roaming place of the first terminal device.

The indication information may indicate a PLMN identity of a network in which the first terminal device is currently registered, and indicating the PLMN identity is equivalent to indicating a roaming place where the first terminal device is located. The indication is made by the identity of the PLMN, which can make the indication more explicit. Alternatively, the indication information may indicate an identifier of a second core network device (e.g., an AMF or an MME) currently serving the first terminal device, which is equivalent to adding the identifier of the second core network device to the indication information by the first core network device (e.g., an HSS or a UDM), and the workload of the first core network device may be reduced without processing the identifier of the second core network device by the first core network device.

With reference to the fourth optional implementation manner of the second aspect, or the fifth optional implementation manner of the second aspect, or the sixth optional implementation manner of the second aspect, in a seventh optional implementation manner of the second aspect, the determining that the first terminal device is in an international roaming state includes:

and determining that the first terminal equipment is in an international roaming state according to the indication information.

The first communication means obtains the indication information so that it can be determined that the first terminal device is in the international roaming state based on the indication information.

In a third aspect, a third method of communication is provided, the method comprising: receiving a subscription information request message from a third core network device, wherein the subscription information request message is used for requesting subscription information of a first terminal device; and sending first subscription information to the third core network device, wherein the first subscription information is subscription information of the first terminal device, and the first subscription information includes indication information, and the indication information is used for indicating that the first terminal device is in an international roaming state.

The method may be performed by a third communication device, which may be a communication apparatus or a communication device, such as a chip, capable of supporting a communication apparatus to implement the functions required by the method. Illustratively, the third communication device is a network device, or a chip disposed in the network device, or other components for implementing functions of the network device. In the following description, the third communication device is taken as an example of a network device. Illustratively, the network device is a UDM or HSS.

With reference to the third aspect, in a first optional implementation manner of the third aspect, the indicating information is used to indicate that the first terminal device is in an international roaming state, and includes:

With reference to the first optional implementation manner of the third aspect, in a second optional implementation manner of the third aspect, the indicating information is used to indicate a roaming destination of the first terminal device, and includes:

the indication information is used for indicating the identifier of the PLMN of the network currently registered by the first terminal equipment; or, the indication information is used to indicate an identifier of a second core network device currently serving the first terminal device, where the identifier of the second core network device includes an identifier of a PLMN of a network currently registered by the first terminal device, or the identifier of the second core network device includes a country code of a roaming place of the first terminal device, and the second core network device is used to provide a mobility management service for the first terminal device; or, the indication information is used for indicating a country code of the roaming place of the first terminal device.

With reference to the third aspect or the first optional implementation manner of the third aspect or the second optional implementation manner of the third aspect, in a third optional implementation manner of the third aspect, the method further includes:

and determining that the first terminal equipment is in an international roaming state according to a PLMN (public land Mobile network) identifier or a country code obtained from an identifier of second core network equipment serving the first terminal equipment currently, wherein the second core network equipment is used for providing a mobility management service for the first terminal equipment.

With regard to the technical effects brought about by the third aspect or the various alternative embodiments of the third aspect, reference may be made to the introduction of the technical effects of the first aspect or the respective embodiments.

In a fourth aspect, a communication device is provided. The communication device may comprise means for performing the method of the first aspect or any optional implementation manner of the first aspect, for example, a receiving unit and a processing unit, and optionally, a display unit, for example, the communication device is the first communication device described above.

In a fifth aspect, a communications apparatus is provided. The communication device may comprise means for performing the method of the second aspect or any alternative embodiment of the second aspect, for example comprising a receiving unit, a transmitting unit and a processing unit, for example the communication device is the second communication device described above.

In a sixth aspect, a communications apparatus is provided. The communication device may comprise means for performing the method of the third aspect or any optional implementation manner of the third aspect, for example, a sending unit, a receiving unit, and a processing unit, for example, the communication device is the third communication device described above.

In a seventh aspect, a communication system is provided. The communication system comprises the communication device of the fourth aspect or the chip system of the eighth aspect, comprises the communication device of the fifth aspect or the chip system of the ninth aspect, and comprises the communication device of the sixth aspect or the chip system of the tenth aspect.

In an eighth aspect, a chip system is provided, where the chip system includes one or more processors and includes a communication interface, and the processors are coupled with the communication interface, and are configured to implement the method provided in the first aspect or any optional implementation manner of the first aspect. Optionally, the chip system may further include a memory, for example, the processor may read and execute a software program stored in the memory to implement the method provided by the first aspect or any optional implementation manner of the first aspect.

In a ninth aspect, a chip system is provided, the chip system comprising one or more processors and a communication interface, the processors being coupled to the communication interface for implementing the method provided in any of the alternative embodiments of the second aspect or the second aspect. Optionally, the chip system may further include a memory, for example, the processor may read and execute a software program stored in the memory to implement the method provided by the second aspect or any optional implementation manner of the second aspect.

In a tenth aspect, a chip system is provided, where the chip system includes one or more processors and a communication interface, and the processors are coupled to the communication interface, and are configured to implement the method provided in the third aspect or any optional implementation manner of the third aspect. Optionally, the chip system may further include a memory, and for example, the processor may read and execute a software program stored in the memory to implement the method provided in the third aspect or any optional implementation manner of the third aspect.

In an eleventh aspect, a computer-readable storage medium is provided, which is used for storing a computer program, and when the computer program runs on a computer, the computer is caused to execute the method provided by the first aspect or any one of the optional implementation manners of the first aspect.

In a twelfth aspect, a computer-readable storage medium is provided, which is used for storing a computer program, and when the computer program runs on a computer, the computer is enabled to execute the method provided by the second aspect or any one of the optional embodiments of the second aspect.

In a thirteenth aspect, a computer-readable storage medium is provided, which is used for storing a computer program, and when the computer program runs on a computer, the computer is caused to execute the method provided by the third aspect or any one of the optional embodiments of the third aspect.

A fourteenth aspect provides a computer program product comprising instructions for storing a computer program which, when run on a computer, causes the computer to perform the method of the first aspect described above or of any one of the alternative embodiments of the first aspect described above.

A fifteenth aspect provides a computer program product comprising instructions for storing a computer program which, when run on a computer, causes the computer to perform the method as performed by the terminal device in any of the alternative embodiments of the second aspect or the first aspect.

A sixteenth aspect provides a computer program product comprising instructions for storing a computer program which, when run on a computer, causes the computer to perform the method as performed by the terminal device in the third aspect or any one of the alternative embodiments of the third aspect.

Through the mode provided by the embodiment of the application, the called party can know the state as long as the calling party is in the international roaming state, so that corresponding prompt measures can be provided, and therefore the efficiency of determining fraud calls is high.

Drawings

FIG. 1 is a flow chart of a terminal device making and receiving a call;

fig. 2 is a schematic diagram of a network architecture for a local breakout roaming scenario;

FIG. 3 is a network architecture diagram illustrating a home routing roaming scenario;

fig. 4 is a flowchart of a first communication method according to an embodiment of the present application;

fig. 5A to 5H are schematic diagrams illustrating how the second terminal device displays incoming call information in the embodiment of the present application;

fig. 6 is a flowchart of a second communication method provided in the embodiment of the present application;

fig. 7 is a schematic block diagram of a core network device according to an embodiment of the present application;

fig. 8 is a schematic block diagram of a second terminal device according to an embodiment of the present application;

fig. 9 is a schematic block diagram of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) The terminal device is a device having a wireless transceiving function, and may be a fixed device, a mobile device, a handheld device, a wearable device, an in-vehicle device, or a wireless apparatus (e.g., a communication module or a chip system) built in the above devices. The terminal device is used for connecting people, objects, machines and the like, and can be widely used in various scenes, such as but not limited to the following scenes: cellular communication, device-to-device communication (D2D), vehicle-to-all (V2X), machine-to-machine/machine-type communication (M2M/MTC), internet of things (IoT), Virtual Reality (VR), Augmented Reality (AR), industrial control (industrial control), unmanned driving (self driving), remote medical (remote medical), smart grid (smart grid), smart furniture, smart office, smart wearing, smart transportation, smart city (smart city), unmanned aerial vehicle, robot, etc. scenarios. The terminal equipment may sometimes be referred to as User Equipment (UE), a terminal, an access station, a UE station, a distant station, wireless communication equipment, or user equipment, among others.

In the embodiment of the present application, the apparatus for implementing the function of the terminal device may be the terminal device, or may be an apparatus capable of supporting the terminal device to implement the function, for example, a chip system, and the apparatus may be installed in the terminal device. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a terminal is taken as an example of a terminal device, and the technical solution provided in the embodiment of the present application is described.

2) The network element, or referred to as a network device, includes an access network element, or referred to as an access network device, such as a base station (e.g., an access point).

A base station may refer to, among other things, a device in an access network that communicates over the air-interface, through one or more cells, with wireless terminal devices. The network element may be configured to interconvert received air frames and Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The network element may also coordinate the management of attributes for the air interface. For example, the network element may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (gNB) in a fifth generation mobile communication technology (5G) New Radio (NR) system, or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud ran) system, which is not limited in the embodiments of the present application.

In this embodiment of the present application, the network element further includes a core network element, or referred to as a core network device, and in a fourth generation mobile communication technology (4G) system, the core network device includes, for example, a Mobility Management Entity (MME) network element or a Home Subscriber Server (HSS) network element; in the 5G system, the core network device includes, for example, an access and mobility management function (AMF) network element, a User Plane Function (UPF) network element, or a Unified Data Management (UDM) network element. It can be considered that, after the evolution from 4G to 5G, the function of the MME is separated into an AMF and a Session Management Function (SMF), where the AMF is used for managing the mobile context of the user and the SMF is used for managing the session context. A user plane function network element, for example, includes a Serving Gateway (SGW) and a packet data network gateway (PDN-GW) in a fourth generation mobile communication technology (4G) system, and includes a user plane function network element (UPF) in a 5G system, for example, and is mainly responsible for connecting to an external network. It is considered that UPF in the 5G system corresponds to the combination of SGW and PDN-GW in the 4G LTE system.

The network element in this embodiment may further include a Serving Call Session Control Function (SCSCF) network element in an IP Multimedia Subsystem (IMS) network. In addition, the network element in the embodiment of the present application may further include an Application Server (AS), and the like.

In this embodiment of the present application, the apparatus for implementing the function of the network element may be a network device, or may be an apparatus capable of supporting the network device to implement the function, for example, a system on chip, and the apparatus may be installed in the network device. Hereinafter, the technical solution provided by the embodiment of the present application is described by taking a device for implementing the function of the network element as a network device as an example.

3) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. For example, A/B, represents: a or B. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple.

And, unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing a plurality of objects, and do not limit the size, content, sequence, timing, priority, degree of importance, etc., of the plurality of objects. For example, the first field and the second field may be the same field or different fields, and such names do not indicate the difference between the time domain lengths, the content of the bearers, the priority levels, the importance levels, and the like of the two fields.

The foregoing has described some of the noun concepts to which embodiments of the present application relate, and the following has described some features of the embodiments of the present application.

At present, a call is to be made between terminal devices, which may be implemented by voice over-term evolution (VoLTE) technology. VoLTE is a high-speed wireless communication standard for handsets and data terminals. It is based on the IMS network, using profiles on the LTE system that are tailored for the control plane (control plane) and the media plane (media plane) for voice services, which enables voice services to be transported as data streams in the LTE data-carrying network, without relying on the traditional circuit-switched voice network. VoLTE communicates based on the S-CSCF of the Home (Home) network, which is served by the Home S-CSCF even if the terminal device is in a roaming state.

Referring to fig. 1, a process of making and receiving a call for a terminal device is described.

S101, the terminal equipment registers in the current network according to a registration process.

For example, if the network in which the terminal device is located is the 4th generation (4G) network, the terminal device may register according to a registration procedure of the 4G network, or if the network in which the terminal device is located is the 5G network, the terminal device may register according to a registration procedure of the 5G network. The registration process may refer to a registration process of a 4G network or a registration process of a 5G network, which is not described herein in detail.

S102, the terminal device 1 initiates registration in the IMS network. It appears, for example, that terminal device 1 sends a registration request message that is routed to S-CSCF-1 within the home network of terminal device 1, which S-CSCF-1 receives the registration request message from terminal device 1.

S103, if the network is a 5G network, the S-CSCF-1 sends a subscription information request message to the UDM, and the UDM receives the subscription information request message from the S-CSCF-1. Or if the network is a 4G network, the S-CSCF-1 sends a subscription information request message to the HSS, and the HSS receives the subscription information request message from the S-CSCF-1.

The subscription information request message is used to request to obtain subscription information of the terminal device 1. The subscription information request message is, for example, Cx-pull, or Cx-put. Where Cx is the name of the interface between CSCF and HSS.

And S104, if the network is a 5G network, the UDM sends a subscription information response message to the S-CSCF-1, and the S-CSCF-1 receives the subscription information response message from the UDM. Or, if the network is a 4G network, the HSS sends a subscription information response message to the S-CSCF-1, and the S-CSCF-1 receives the subscription information response message from the HSS.

The subscription information response message includes the subscription information of the terminal device 1. If the subscription information request message is Cx-pull, the subscription information response message may be Cx-pull response; alternatively, if the subscription information request message is Cx-put, the subscription information response message may be Cx-put response.

S105, S-CSCF-1 sends a registration response message to terminal device 1, and terminal device 1 receives the registration response message from S-CSCF 1.

The registration response message may indicate that the registration of the terminal device with the IMS network was successful. The registration response message is, for example, a 200OK message.

S106, terminal device 1 sends an invite (invite) message, where the invite message is routed to S-CSCF-1, and then S-CSCF-1 receives the invite message from terminal device 1. The invite message may include the called number, e.g. the called party is terminal device 2, and the invite message may include the number of terminal device 2.

After S105 is executed, the terminal device 1 completes registration in the IMS network, and can perform operations such as making and receiving calls. S106 can be executed if the terminal device 1 needs to make a call.

S107, S-CSCF-1 routes the invite message to S-CSCF-2 serving terminal device 2 according to the called number in the invite message, and S-CSCF-2 receives the invite message from S-CSCF-1.

And S108, the S-CSCF-2 sends the invite message to the terminal equipment 2, and the terminal equipment 2 receives the invite message from the S-CSCF-2.

For the terminal device 2, after receiving the invite message, operations such as ringing may be performed to prompt the user that there is an incoming call.

S109, the terminal device 2 sends a 200OK message, and the 200OK message is routed to the terminal device 1. For example, the 200OK message is routed to S-CSCF-2, S-CSCF-2 routes the 200OK message to S-CSCF-1, and S-CSCF-1 routes the 200OK message to terminal device 1.

If the terminal device 2 performs an operation of answering the incoming call, S109 is performed. Upon receiving the 200OK message, the terminal device 1 establishes a communication connection with the terminal device 2, and can start a voice call with the called party.

With the domestic implementation of the safe city, domestic telecom fraud is basically cleaned up, but still many telecom fraud phones from abroad are layered endlessly and cannot be effectively attacked. In the fraud telephone from abroad, a considerable part of the incoming telephone numbers are domestic numbers and are only used by being taken abroad. Generally, if a user in China is out of the country, the user rarely continues to make a call by using a mobile phone number in China. Therefore, if the phone number is a domestic phone number, but the phone number is used abroad, the phone number is probably a fraud phone. However, to determine whether an incoming call is a fraudulent call, the incoming call number is typically dialed multiple times so that the incoming call number is determined to be a fraudulent call. Thus, for the user to receive the phone call, there may be a need to receive multiple fraudulent calls, or there may be multiple users receiving fraudulent calls. Thus, current methods of determining fraudulent calls are inefficient and may result in the personal and property safety of the user being compromised.

In view of this, the technical solutions of the embodiments of the present application are provided. In this embodiment, if it is determined that the first terminal device is in the international roaming state, the first information may be added to the second call request to indicate that the first terminal device is in the international roaming state. The second terminal device is, for example, a called party, and the second terminal device may prompt the user to prevent the user from being cheated. Therefore, through the mode provided by the embodiment of the application, the called party can know the fraud call as long as the calling party is in the international roaming state, so that corresponding prompt measures can be provided, the efficiency of determining the fraud call is higher, the fraud call can be determined only by dialing once without dialing for many times, and the method is more effective for guaranteeing personal and property safety of the user.

The technical solution provided in the embodiment of the present application may be applied to a 4G system, for example, an LTE system, or may be applied to a 5G system, for example, an NR system, or may also be applied to a next generation mobile communication system or other similar communication systems, which is not limited specifically.

Fig. 2 is a schematic diagram of a network architecture of a Local Breakout Out (LBO) roaming scenario, which is an application scenario of the embodiment of the present application. In fig. 2, the part to the left of the straight line represents a Public Land Mobile Network (PLMN) of a roaming place, and the part to the right of the straight line represents a PLMN of a home place, in the PLMN network of the roaming place, a (radio) access network (R) AN, AN AMF network element and a UPF network element are included, and the terminal device may communicate directly with the AMF network element, such as transmittable signaling, fig. 2 exemplifies 5G signaling, the terminal device may also communicate with (R) AN, such as transmittable data, fig. 2 exemplifies 5G data, the terminal device may also communicate with a S-CSCF network element in the home PLMN, such as transmittable IMS signaling, and further, the terminal device may also communicate with S-CSCF through the (R) AN and UPF network elements, and may communicate with a UDM network element (5G network) or AN HSS network element (4G network) in the home PLMN through the AMF network element, signaling may be transmitted between the AMF and the UDM/or the HSS network, fig. 2 takes 5G signaling as an example, data can be transmitted between the UPF and the S-CSCF, and fig. 2 takes 5G data as an example. The home PLMN may further include an AS network element, and fig. 2 may actually include more AS network elements, for example, a Telephony Application Server (TAS) network element, and the TAS network element is only one of the AS network elements. The UDM/HSS network elements are capable of communicating with the TAS network elements, e.g. transmitting IMS signalling, the S-CSCF network elements are capable of communicating with the TAS network elements, e.g. transmitting IMS signalling, and the UDM/HSS network elements are also capable of communicating with the S-CSCF network elements, e.g. transmitting IMS signalling. In fig. 2, the 5G data is represented by a solid line, and the 5G signaling and the IMS signaling are represented by two different dotted lines, which can be seen in the legend of fig. 2.

Please refer to fig. 3, which is a schematic diagram of a network architecture in a Home Routed (HR) roaming scenario, which is another application scenario in the embodiment of the present application. In fig. 3, the part to the left of the straight line indicates the PLMN of the roaming destination, and the part to the right of the straight line indicates the PLMN of the home destination. In the roaming PLMN network, including (R) AN and AMF network elements, the terminal device may directly communicate with the AMF network element, for example, may transmit signaling, fig. 3 takes 5G signaling as AN example, the terminal device may also communicate with (R) AN, for example, transmit data, fig. 3 takes 5G data as AN example, and the terminal device may also communicate with AN S-CSCF network element in the home PLMN, for example, transmit IMS signaling. In addition, the terminal device may also communicate with the S-CSCF via the (R) AN and the UPF network element in the home PLMN, and may communicate with the UDM network element (5G network) or the HSS network element (4G network) in the home PLMN via the AMF network element. Signaling can be transmitted between the AMF and the UDM/HSS, fig. 3 takes 5G signaling as an example, data can be transmitted between the UPF and the S-CSCF, and fig. 3 takes 5G data as an example. The home PLMN may further include an AS network element, and fig. 3 illustrates a TAS network element, which may actually include more AS network elements, where the TAS network element is only one of the AS network elements. The UDM/HSS network elements are capable of communicating with the TAS network elements, e.g. transmitting IMS signalling, the S-CSCF network elements are capable of communicating with the TAS network elements, e.g. transmitting IMS signalling, and the UDM/HSS network elements are also capable of communicating with the S-CSCF network elements, e.g. transmitting IMS signalling. In fig. 3, the 5G data is represented by a solid line, and the 5G signaling and the IMS signaling are represented by two different dotted lines, respectively, as can be seen in the legend of fig. 3.

The network elements referred to in fig. 2 or fig. 3 will be briefly described below.

The S-CSCF is a core network entity in the VoLTE technology, and is responsible for registration of terminal devices, and management of calling and called parties. VoLTE is based on S-CSCF of the home network to communicate, and even if the terminal equipment is in roaming state, the S-CSCF in the home network of the terminal equipment provides service for the terminal equipment.

The embodiment of the present application is not limited to this, and may be implemented by other network elements in other communication systems. Taking an example in which the network element with a mobility management function is an AMF, the AMF is mainly responsible for interfacing with a radio, terminating a RAN Control Plane (CP) interface, that is, an N2 interface, terminating a non-access-stratum (NAS) and NAS encryption and integrity protection, registration management, connection management, reachability management, mobility management, and transferring a Session Management (SM) message between a User Equipment (UE) and the SMF, or notifying a mobility event of the UE.

And the UDM is used for generating authentication trusts, processing user identification (such as storing and managing user permanent identity and the like), accessing authorization control, signing data management and the like. For example, in some embodiments of the present application, the UDM may also store a correspondence between group identifications and data types.

HSS, primary user database supporting IMS network entities for handling calls/sessions. The HSS contains user profiles, may perform authentication and authorization of the user, may provide information about the user's physical location, etc.

The UPF is an entity for forwarding user plane data, serves as a session point of a Protocol Data Unit (PDU) interconnected with a data network, and has functions of routing and forwarding a message, detecting a message, performing a user plane part policy, lawful interception, reporting traffic usage, or quality of service (QoS) processing, and the like.

The AS, which is an application server, may provide services for the corresponding application. The AS may be provided by a developer of the application, for example, if the terminal device may install some Applications (APPs), the AS may provide services for the corresponding applications.

In fig. 2 or fig. 3, the main function of (R) AN is to control the terminal device to access the mobile communication network by radio. The (R) AN is part of a mobile communication system. It implements a wireless access technology. (R) AN devices include, but are not limited to: a gbb, an eNB, a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved node B or home node B, HNB), a baseband unit (BBU), a transmission point (TRP), a Transmission Point (TP), a mobile switching center, etc., and may further include a wireless fidelity (Wi-Fi) access point (access point, AP), etc.

The method provided by the embodiment of the application is described below with reference to the accompanying drawings. For convenience of description, in the following description of the embodiments of the present application, an AMF network element is abbreviated AS AMF, an MME network element is abbreviated AS MME, an UDM network element is abbreviated AS UDM, an HSS network element is abbreviated AS HSS, an UPF network element is abbreviated AS UPF, an S-CSCF network element is abbreviated AS S-CSCF, and an AS network element is abbreviated AS (for example, a TAS network element is abbreviated AS TAS). In addition, since there is no concept of national roaming, the term "roaming" can be understood as "international roaming". In other words, "international roaming" described in the embodiments of the present application may be replaced with "roaming".

The embodiment of the present application provides a first communication method, please refer to fig. 4, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 2 or fig. 3 as an example.

For ease of description, in the following, the method is performed by a network device and a terminal device as an example. The first terminal device (or, the calling device) described below is a terminal device in the network architecture shown in fig. 2 or fig. 3, the first core network device described below is, for example, a UDM or a HSS in the network architecture shown in fig. 2 or fig. 3, the second core network device described below is capable of providing a mobility management service for the first terminal device, for example, an AMF or an MME in the network architecture shown in fig. 2 or fig. 3, and the third core network device described below is, for example, an S-CSCF (hereinafter, referred to as S-CSCF-1, which is an S-CSCF serving the first terminal device) in the network architecture shown in fig. 2 or fig. 3. Alternatively, the first core network device may be referred to as a first network device, the second core network device may be referred to as a second network device, and the third core network device may be referred to as a third network device. The first core network device, the second core network device and the third core network device are all core network devices serving the first terminal device. The following also relates to S-CSCF-2, which is an S-CSCF serving the second terminal device, which is the called device. And in the following, the first core network device is UDM or HSS, the second core network device is AMF or MME, and the third core network device is S-CSCF-1 as an example.

S401, the first terminal equipment registers in the current network according to the registration process.

For example, when a first terminal device first accesses a network, the first terminal device registers in the current network according to a registration procedure. Or, the first terminal device may register in the current network according to the registration procedure when being powered on. Alternatively, after the first terminal device moves, for example, from the home location to the roaming location, the first terminal device may register in the current network according to the registration procedure.

For example, if the network where the first terminal device is located is a 4th generation (4G) network, the first terminal device may register according to a registration procedure of the 4G network, or if the network where the first terminal device is located is a 5G network, the first terminal device may register according to a registration procedure of the 5G network. The registration process may refer to a registration process of a 4G network or a registration process of a 5G network, which is not described herein in detail.

S402, the first terminal device initiates registration in the IMS network. For example, it is shown that the first terminal device sends a registration request message, which is routed to the S-CSCF-1, S-CSCF-1 within the home network of the first terminal device to receive the registration request message from the first terminal device.

Because the call function of the terminal device needs to be completed by means of the IMS network, if the first terminal device needs to perform a service such as a call, or if the first terminal device has a function such as a call, the first terminal device also needs to initiate registration in the IMS network. For example, after the first terminal device has registered in the current network, registration may be initiated in the IMS network.

S403, if the network is a 5G network, the S-CSCF-1 sends a subscription information request message to the UDM, and the UDM receives the subscription information request message from the S-CSCF-1. Or if the network is a 4G network, the S-CSCF-1 sends a subscription information request message to the HSS, and the HSS receives the subscription information request message from the S-CSCF-1.

The subscription information request message is used for requesting to obtain subscription information of the first terminal device. The subscription information request message is, for example, Cx-pull, or Cx-put.

S404, if the network is a 5G network, the UDM determines that the first terminal equipment is in the international roaming state according to the PLMN identification or the country code obtained from the identification of the AMF serving the first terminal equipment. Or, if the terminal equipment is a 4G network, the HSS determines that the first terminal equipment is in the international roaming state according to the PLMN identifier or the country code obtained from the identifier of the MME serving the first terminal equipment. The PLMN identity may include, for example, a Mobile Country Code (MCC) and a Mobile Network Code (MNC). The country code in the embodiments of the present application is, for example, MCC. That is, the UDM or HSS may determine that the first terminal device is in the international roaming state according to the MCC and MNC, or the UDM or HSS may determine that the first terminal device is in the international roaming state according to the MCC.

Take a 5G network as an example. Each time the first terminal device registers in an AMF, the AMF sends the information of the AMF to the UDM. The UDM described in this embodiment of the present application belongs to a home network of a first terminal device, an AMF registered by the first terminal device obtains an identifier of the first terminal device through a registration process of the first terminal device, the identifier of the first terminal device includes an identifier of a PLMN of the home location of the first terminal device, and the AMF registered by the first terminal device can determine the UDM according to the identifier of the PLMN included in the identifier of the first terminal device, and send information of the AMF to the UDM. Even if the first terminal device is in the roaming state, after the terminal device registers in the AMF of the roaming place, the AMF will send the information of the AMF to the UDM of the home of the first terminal device. The UDM is thus able to learn the information of the AMF currently serving the first terminal device. When the AMF registered by the first terminal device sends the information of the AMF to the UDM, the identifier of the first terminal device may also be sent together, so that the UDM may determine that the information of the AMF is the information of the AMF registered by the first terminal device. The identifier of the first terminal device is, for example, a subscription permanent identifier (SUPI) or an international mobile subscriber identity Number (IMSI), or may be other information capable of indicating the first terminal device. The information of the AMF may comprise an identity of the AMF, which may comprise an identity of the PLMN, or an identity of the AMF comprising an MCC. Then, the UDM may determine whether the first terminal device is in the international roaming state according to the identity of the AMF currently serving the first terminal device and the identity of the PLMN of the home of the first terminal device included in the identity of the first terminal device.

For example, if the UDM determines that the MCC included in the identifier of the first terminal device is the MCC in china, and determines that the MCC included in the identifier of the AMF currently serving the first terminal device is the MCC in another country, for example, the MCC in the united states, the UDM may determine that the first terminal device is in the international roaming state. Alternatively, since generally one country corresponds to only one country code, if the UDM determines that the MCC included in the identity of the first terminal device is different from the MCC included in the identity of the AMF currently serving the first terminal device, the UDM may determine that the first terminal device is in the international roaming state.

For another example, the UDM determines that the MCC included in the identifier of the first terminal device is MCC in china, and the MNC included in the identifier of the first terminal device corresponds to an operator in china, and determines that the MCC included in the identifier of the AMF currently serving the first terminal device is MCC in other countries, for example, MCC in the united states, and the MNC included in the identifier of the AMF currently serving the first terminal device corresponds to an operator in the united states, then the UDM may determine that the first terminal device is in the international roaming state. Or, the UDM may determine that the MCC included in the identifier of the first terminal device is different from the MCC included in the identifier of the AMF currently serving the first terminal device, and determine that the MNC included in the identifier of the first terminal device is different from the MNC included in the identifier of the AMF currently serving the first terminal device, so that the UDM may determine that the first terminal device is in the international roaming state.

The same is true for 4G networks. Each time the first terminal device registers to an MME, the MME sends information of the MME to the HSS. The HSS described in this embodiment of the present application belongs to a home network of a first terminal device, an MME registered by the first terminal device obtains an identifier of the first terminal device through a registration process of the first terminal device, the identifier of the first terminal device includes an identifier of a PLMN of the home location of the first terminal device, and the MME registered by the first terminal device can determine the HSS according to the identifier of the PLMN included in the identifier of the first terminal device, and send information of the MME to the HSS. Even if the first terminal device is in the roaming state, after the terminal device is registered in the MME of the roaming location, the MME sends the information of the MME to the HSS of the home location of the first terminal device. The HSS can thus learn the information of the MME currently serving the first terminal device. Similarly, when the MME registered in the first terminal device transmits the information of the MME to the HSS, the HSS may also transmit the identifier of the first terminal device together so that the HSS determines that the information of the MME is the information of the MME registered in the first terminal device. The information of the MME may comprise an identity of the MME, which may comprise an identity of the PLMN, or an identity of the MME may comprise an MCC. Then, the HSS may determine whether the first terminal device is in the international roaming state according to the identifier of the MME currently serving the first terminal device and the identifier of the PLMN of the home location of the first terminal device included in the identifier of the first terminal device.

For example, if the HSS determines that the MCC included in the identifier of the first terminal device is the MCC in china, and determines that the MCC included in the identifier of the MME currently serving the first terminal device is the MCC in another country, for example, the MCC in cambodia, the HSS may determine that the first terminal device is in the international roaming state. Or, if the HSS determines that the MCC included in the identifier of the first terminal device is different from the MCC included in the identifier of the MME currently serving the first terminal device, the HSS may determine that the first terminal device is in the international roaming state.

For another example, if the HSS determines that the MCC included in the identifier of the first terminal device is MCC in china, and the MNC included in the identifier of the first terminal device corresponds to an operator in china, and determines that the MCC included in the identifier of the MME currently serving the first terminal device is MCC in other countries, such as MCC in cambodia, and the MNC included in the identifier of the MME currently serving the first terminal device corresponds to an operator in cambodia, the HSS may determine that the first terminal device is in the international roaming state. Or, the HSS determines that the MCC included in the identifier of the first terminal device is different from the MCC included in the identifier of the MME currently serving the first terminal device, and determines that the MNC included in the identifier of the first terminal device is different from the MNC included in the identifier of the MME currently serving the first terminal device, then the HSS may determine that the first terminal device is in the international roaming state.

S405, if the network is a 5G network, the UDM sends first subscription information to the S-CSCF-1, and the S-CSCF-1 receives the first subscription information from the UDM. Or, if the network is a 4G network, the HSS sends the first subscription information to the S-CSCF-1, and the S-CSCF-1 receives the first subscription information from the HSS.

The first subscription information is subscription information of the first terminal device. The first subscription information may further include indication information, where the indication information may indicate that the first terminal device is in an international roaming state.

The indication information indicates that the first terminal device is in the international roaming state, and different indication modes are available. For example, the indication information may indicate a roaming place of the first terminal device, which is equivalent to indicating that the first terminal device is in an international roaming state; alternatively, the indication information may comprise a tag, for example referred to as a first tag, which may indicate that the first terminal device is in an international roaming state.

The indication information is to indicate the roaming location of the first terminal device, and there may be a plurality of indication manners, which are described as examples below.

As a first way that the indication information indicates the roaming place of the first terminal device, the indication information may indicate a PLMN identifier of a network in which the first terminal device is currently registered, and indicating the PLMN identifier is equivalent to indicating the roaming place where the first terminal device is located. The network to which the first terminal device is currently registered, that is, the roaming network of the first terminal device. This way is equivalent to that the UDM or HSS obtains the identifier of the PLMN from the identifier of the second core network device, and then adds the identifier of the PLMN to the indication information. The indication is made by the identity of the PLMN, which can make the indication more explicit. For example, the indication information includes an identifier of a PLMN of a network in which the first terminal device is currently registered, and the identifier of the PLMN includes MCC and MNC, then the indication information is equivalent to that the roaming destination of the first terminal device is indicated by the identifier of the PLMN.

As a second way for indicating the roaming location of the first terminal device, the indication information may indicate an identifier of an AMF or an MME currently serving the first terminal device, and indicating the identifier of the AMF (5G network) or the identifier of the MME (4G network) is equivalent to indicating the roaming location where the first terminal device is located. The AMF or MME currently serving the terminal device, that is, the AMF or MME of the roaming location of the first terminal device, is described. The method is equivalent to that the UDM or the HSS adds the identifier of the second core network equipment into the indication information, the UDM or the HSS is not required to process the identifier of the second core network equipment, and the workload of the UDM or the HSS can be reduced. The identity of the AMF or the identity of the MME may include an identity of a PLMN, and therefore, the indication information indicates the identity of the AMF or the MME, which is equivalent to indicating the identity of the PLMN.

As a third way of indicating the roaming location of the first terminal device by the indication information, the indication information may indicate a country code of the roaming location of the first terminal device, and by indicating the country code, it is equivalent to indicating the roaming location where the first terminal device is located. For example, if the indication information includes the MCC in the identifier of the AMF or the identifier of the MME currently serving the terminal device, the indication MCC is equivalent to the indication of the roaming location of the first terminal device. The AMF or MME currently serving the terminal device, that is, the AMF or MME of the roaming location of the first terminal device, is described. The indication information indicates the country code, so that the information quantity of the indication information can be reduced, and the transmission overhead can be saved.

Of course, in addition to the above manner, the indication information may also indicate the roaming destination of the first terminal device by indicating other contents, and the embodiment of the present application is not limited.

For example, the UDM or HSS may send the first subscription information bearer in a subscription information response message to the S-CSCF-1. If the subscription information request message is Cx-pull, the subscription information response message may be Cx-pull response; alternatively, if the subscription information request message is Cx-put, the subscription information response message may be Cx-put response.

S406, the S-CSCF-1 records the indication information.

After receiving the first subscription information, the S-CSCF-1 may record indication information. For example, if the indication information indicates that the first terminal device is in the international roaming state but does not indicate a roaming destination, the S-CSCF-1 may record that the first terminal device is in the international roaming state but cannot record the roaming destination of the first terminal device; or, the indication information indicates the roaming place of the first terminal device, the S-CSCF-1 may record the roaming place of the first terminal device. Wherein, when the indication information indicates the roaming place of the first terminal device, the indication mode can refer to the relevant introduction in S405, and then the information recorded by the S-CSCF-1 is adapted to the content indicated by the corresponding indication mode.

For example, the indication information indicates a PLMN identity of a network to which the first terminal device is currently registered, and then the S-CSCF-1 may record the PLMN identity of the network to which the first terminal device is currently registered. For example, if the indication information includes MCC and MNC in the identity of the AMF or the identity of the MME currently serving the terminal device, the S-CSCF-1 may record MCC and MNC in the identity of the AMF or the identity of the MME currently serving the terminal device.

For another example, if the indication information indicates the identity of the AMF or MME currently serving the first terminal device, the S-CSCF-1 may record the identity of the AMF or MME currently serving the first terminal device. And the identity of the AMF or MME currently serving the first terminal device includes the identity of the PLMN, which is equivalent to that the S-CSCF-1 records the identity of the PLMN currently registered by the first terminal device.

For another example, the indication information indicates a country code of the roaming place of the first terminal device, and then the S-CSCF-1 may record the country code of the roaming place of the first terminal device. For example, if the indication information includes the MCC in the identity of the AMF or the identity of the MME currently serving the terminal device, the S-CSCF-1 may record the MCC in the identity of the AMF or the identity of the MME currently serving the terminal device.

S407, the S-CSCF-1 sends a registration response message to the first terminal device, and the first terminal device receives the registration response message from the S-CSCF-1.

The registration response message indicates, for example, that the registration is successful, or indicates that the registration is failed. Here, the registration refers to registration of the first terminal device in the IMS network, and therefore, if the registration response message indicates that the registration is successful, it indicates that the registration of the first terminal device in the IMS network is successful, and if the registration response message indicates that the registration is failed, it indicates that the registration of the first terminal device in the IMS network is failed. The registration response message is, for example, a 200OK message.

S408, the first terminal equipment sends a second call request, the second call request is routed to S-CSCF-1, and then the S-CSCF-1 receives the second call request from the first terminal equipment. The second call request may be for the first terminal device to call the second terminal device.

S408 may be executed when the first terminal device needs to make a call, for example, when the first terminal device makes a call to the second terminal device, the second call request is used to call the second terminal device. The second call request is, for example, an invite message, or may be another message. At this time, the first terminal device may be referred to as a calling device, and the second terminal device may be referred to as a called device.

S409 and S-CSCF-1 determine that the first terminal equipment is in the international roaming state, and then the S-CSCF-1 adds the first information in the second call request to obtain a third call request.

After receiving the second call request, the S-CSCF-1 may determine whether the first terminal device is in the international roaming state. For example, for a terminal device that is not in an international roaming state, when the UDM or the HSS sends the subscription information of the terminal device to the S-CSCF-1, the subscription information does not include indication information, that is, the UDM or the HSS does not indicate that the terminal device is in the international roaming state, and then the S-CSCF-1 does not record the indication information corresponding to the terminal device. For a terminal device in the international roaming state, when the UDM or the HSS sends the subscription information of the terminal device to the S-CSCF-1, the subscription information may include indication information (for example, the first subscription information sent by the UDM or the HSS in S405 includes the indication information), and then the S-CSCF-1 may record the indication information corresponding to the terminal device. Therefore, after receiving the second call request, the S-CSCF-1 may determine whether indication information corresponding to the first terminal device is recorded, and if the indication information corresponding to the first terminal device is recorded, or if it is determined that the first terminal device has corresponding indication information, the S-CSCF-1 may determine that the first terminal device is in the international roaming state, and if the indication information corresponding to the first terminal device is not recorded, or if it is determined that the first terminal device does not have corresponding indication information, the S-CSCF-1 may determine that the first terminal device is not in the international roaming state.

If the S-CSCF-1 determines that the first terminal device is in the international roaming state, the S-CSCF-1 may add the first information in the second call request, for example, refer to the second call request to which the first information is added as a third call request. If S-CSCF-1 determines that the first terminal device is not in the international roaming state, S-CSCF-1 may route the second call request to S-CSCF-2 serving the second terminal device without adding the first information to the second call request, and the specific steps may refer to the descriptions of S107 to S109 in fig. 1.

In an embodiment of the present application, the first information may indicate that the first terminal device is in an international roaming state. The first information indicates that the first terminal equipment is in an international roaming state, and different indication modes are available. For example, the first information may indicate a roaming place of the first terminal device, which is equivalent to indicating that the first terminal device is in an international roaming state; alternatively, the first information may comprise a tag, for example referred to as a second tag, which may indicate that the first terminal device is in an international roaming state.

Wherein, if the indication information indicates that the first terminal device is in the international roaming state and does not indicate other content, the first information may include a second tag; alternatively, if the indication information indicates the roaming place of the first terminal device, the first information may include the second tag, or may also indicate the roaming place of the first terminal device.

The first information may have different indication modes if it indicates the roaming place of the first terminal device.

For example, the first information indicates a name of a roaming place of the first terminal device, for example, indicates that the roaming place of the first terminal device is the united states. If the indication information recorded by the S-CSCF-1 indicates the identifier of the PLMN of the network in which the first terminal device is currently registered, because the identifier of the PLMN includes the MCC, the S-CSCF-1 can determine the name of the roaming location of the first terminal device according to the identifier of the PLMN. Or, if the indication information recorded by the S-CSCF-1 indicates the identity of the AMF or MME currently serving the first terminal device, the S-CSCF-1 may obtain the identity of the PLMN from the indication information, and since the identity of the PLMN includes the MCC, the S-CSCF-1 may determine the roaming destination name of the first terminal device according to the identity of the PLMN. Or the indication information indicates the country code of the roaming place of the first terminal device, for example, the indication information includes the MCC, and then the S-CSCF-1 may determine the name of the roaming place of the first terminal device according to the MCC.

For another example, the first information indicates a roaming place name of the first terminal device, and the first information further includes a roaming tag that may indicate that the first terminal device is in an international roaming state. For example, the first information is "united states roaming". Reference may be made to the description in the previous paragraph as to how the roaming destination name is determined.

For another example, the first information may indicate a country code of the roaming destination of the first terminal device, for example, the country code of the roaming destination of the first terminal device indicated by the first information is 00855. Wherein, if the indication information recorded by the S-CSCF-1 indicates the identity of the PLMN of the network to which the first terminal device is currently registered, because the identity of the PLMN includes the MCC, the S-CSCF-1 may determine that the MCC is the country code of the roaming destination. Or, if the indication information recorded by the S-CSCF-1 indicates the identity of the AMF or MME currently serving the first terminal device, the S-CSCF-1 may obtain the identity of the PLMN from the indication information, and because the identity of the PLMN includes the MCC, the S-CSCF-1 may determine that the MCC is the country code of the roaming location. Or, the indication information indicates the country code of the roaming place of the first terminal device, for example, the indication information includes the MCC, and then the S-CSCF-1 may determine that the MCC is the country code of the roaming place.

For another example, the first information may indicate a roaming-place operator name of the first terminal device, for example, the first information indicates that the roaming-place operator of the first terminal device is AT & T. If the indication information recorded by the S-CSCF-1 indicates the identity of the PLMN of the network in which the first terminal device is currently registered, because the identity of the PLMN includes the MNC, the S-CSCF-1 may determine the name of the roaming operator of the first terminal device according to the MCC. Or, if the indication information recorded by the S-CSCF-1 indicates the identity of the AMF or MME currently serving the first terminal device, the S-CSCF-1 may obtain the identity of the PLMN therefrom, and because the identity of the PLMN includes the MNC, the S-CSCF-1 may determine the name of the roaming operator of the first terminal device according to the MCC.

As another example, the first information may indicate an identity of a PLMN of the roaming location of the first terminal device. If the indication information recorded by the S-CSCF-1 indicates the identifier of the PLMN of the network in which the first terminal device is currently registered, the S-CSCF-1 may directly determine, according to the indication information, that the identifier of the PLMN is the identifier of the PLMN of the roaming location of the first terminal device. Or, if the indication information recorded by the S-CSCF-1 indicates the identity of the AMF or MME currently serving the first terminal device, the S-CSCF-1 may obtain the identity of the PLMN from the indication information, so as to determine that the identity of the PLMN is the identity of the PLMN of the roaming destination of the first terminal device.

The S-CSCF-1 adds the first information in the second call request, or there may be different addition manners, which is described as an example below.

1. A first implementation of adding the first information in the second call request.

The S-CSCF-1 adds a first field for carrying the first information in the P-Asserted-Identity or from (from) header field included in the second call request. Wherein, the P-Asserted-Identity may be referred to as an Asserted Identity.

The second call request is, for example, an invite message, which may include a plurality of headers, and the P-Asserted-Identity and from header fields are two headers included in the second call request. The S-CSCF-1 may add the first field to carry the first information in the header included in the second call request, so that no additional header needs to be added for the second call request, which helps to simplify the structure of the second call request.

Take the example that S-CSCF-1 adds the first field in the P-Asserted-Identity of the second call request. For example, the S-CSCF-1 may employ any of the following additions:

(1) P-Asserted-Identity < tel:182 XXXXXXXXX > < "Cambodia";

(2) P-Asserted-Identity < tel:182 XXXXXXXXX > < "roaming in Cambodia";

(3) P-Asserted-Identity: < tel:182 XXXXXXXXX > < "International roaming" >;

(4)P-Asserted-Identity:<tel:182XXXXXXXX><“00855”>；

(5)P-Asserted-Identity:<tel:182XXXXXXXX><“Mfone”>；

(6)P-Asserted-Identity:<tel:182XXXXXXXX><“232”,“03”>。

wherein tel is 182XXXXXXXX as the calling number, which is the number of the first terminal device, and this is the original field in P-Asserted-Identity, and is referred to as the second field, for example. The embodiment of the present application may add a first field, i.e., a field located after tel:182XXXXXXXX in the above example, to the P-Asserted-Identity, where the first field carries the first information. For example, if the above addition manner (1) is adopted, the first information indicates the name of the roaming place of the first terminal device, and the above example takes the example that the roaming place of the first terminal device is cambodia; if the adding mode of the (3) is adopted, the first information indicates that the first terminal equipment is international roaming; if the addition manner (2) is adopted, the first information indicates the name of the roaming place of the first terminal device, and the first information further includes a roaming tag, which is exemplified by the two characters that the roaming place of the first terminal device is cambodia and the roaming tag is "roaming"; if the adding mode of the (3) is adopted, the first information indicates that the first terminal equipment is international roaming; if the addition manner of (4) above is adopted, the first information indicates the country code of the roaming place of the first terminal device, which is 00855 as an example above; if the addition manner of (5) above is adopted, the first information indicates the name of the roaming-place operator of the first terminal device, and the example above takes the example that the roaming-place operator of the first terminal device is Mfone; if the adding manner of (6) above is adopted, the first information indicates an identity of a PLMN of the roaming destination of the first terminal device, where the identity of the PLMN includes MCC and MNC, and the above example takes MCC as 232 and MNC as 03 as examples.

In addition, in addition to the above several ways, if the first field is to be added to the P-Asserted-Identity of the second call request, other ways of adding may also be used, or the first information carried by the added first field may also be used to indicate other contents, as long as it can indicate that the first terminal device is in the international roaming state.

2. A second implementation of adding the first information in the second call request.

A new header is added to the second call request, for example referred to as the first header, which may carry the first information. In this way, the original header of the second call request does not need to be changed, but the header is added to the second call request to carry the first information, so that the influence on other headers of the second call request can be reduced.

For example, the name of the first header is P-original (original) -country (country), or the first header may be other names, and the embodiments of the present application do not limit the names.

For example, the S-CSCF-1 may add the first message header in any of the following ways:

(a) P-Original-Country: "Cambodia";

(b) P-Original-Country: "roaming in Cambodia";

(c) P-Original-Country: "international roaming";

(d)P-Original-Country:“00855”；

(e)P-Original-Country:“Mfone”；

(f)P-Original-Country:“232”,“03”。

for example, if the addition manner of (a) above is adopted, the first information indicates the name of the roaming place of the first terminal device, and the example above takes the example that the roaming place of the first terminal device is cambodia as an example; if the addition manner of (b) above is adopted, the first information indicates the name of the roaming place of the first terminal device, and the first information further includes a roaming tag, the example above takes the two characters that the roaming place of the first terminal device is cambodia as an example, and the roaming tag is "roaming"; if the adding mode in the (c) is adopted, the first information indicates that the first terminal equipment is international roaming; if the addition manner of (d) above is adopted, the first information indicates the country code of the roaming place of the first terminal device, and the above example takes 00855 as the country code of the roaming place of the first terminal device as an example; if the addition manner of (e) above is adopted, the first information indicates the name of the roaming-place operator of the first terminal device, and the example above takes the case that the roaming-place operator of the first terminal device is Mfone; if the adding manner in (f) above is adopted, the first information indicates an identity of a PLMN of the roaming destination of the first terminal device, where the identity of the PLMN includes MCC and MNC, and the above example takes MCC as 232 and MNC as 03 as examples.

3. A third implementation of adding the first information in the second call request.

In a third implementation manner, the method further includes a first sub implementation manner and a second sub implementation manner.

The first sub-implementation is to add the first information to a second field in the P-Asserted-Identity included in the second call request, where the second field is originally included in the P-Asserted-Identity. In the method, a new message header and a new field are not required to be added in the second call request, and only the first information is carried through the original field extension, so that the method is simple to realize.

For example, the second field is used to carry the number of the first terminal device, for example, the second field is the aforementioned < tel:182xxxxxx > field. If the second terminal device supports incoming call display, the number carried by the second field is displayed, for example, the second field is tel:182XXXXXXXX field, and the second terminal device displays 182 xxxxxxxxxx. Then, the embodiment of the present application may add the first information in the second field, so that the second terminal device displays the first information together when displaying. For example, the first information indicates the country code of the roaming place of the first terminal device, and taking the country code of the roaming place of the first terminal device as 00855 as an example, one way for the S-CSCF-1 to add the first information to the second field is P-Asserted-Identity: < tel:00855182 xxxxxxxxxx >, where 00855 is the first information, so that when the second terminal device displays an incoming call, 00855182XXXXXXXX is displayed together, which prompts the user.

In addition, the content carried by the second field is displayed by the second terminal device, and the second terminal device can display the incoming call according to the original rule without changing the execution rule of the second terminal device. The implementation is simpler for the second terminal device, which facilitates the compatibility with more terminal devices.

A second sub-implementation is to add first information in a third field in the from header field included in the second call request, for example, the first information indicates a country code of the roaming destination of the first terminal device, or may indicate other information. The third field is also the original field in the from header field, and the mode does not need to add a new message header or a new field in the second call request, but only needs to carry the first information through the original field extension, so that the realization is simpler.

For example, the third field is also used to carry the number of the first terminal device, e.g. the third field is the < tel:182XXXXXXX > field. If the second terminal device supports incoming call display, the number carried by the third field is displayed, for example, the third field is tel:182XXXXXXXX field, and the second terminal device displays 182 xxxxxxxxxx. Then, the embodiment of the present application may add the first information to the third field, so that the second terminal device displays the first information together when displaying. For example, the first information indicates the country code of the roaming place of the first terminal device, and taking the country code of the roaming place of the first terminal device as 00855 as an example, one way for the S-CSCF-1 to add the first information to the third field is from a header field of < tel:00855182XXXXXXXX >, where 00855 is the first information, so that when the second terminal device displays an incoming call, 00855182xxxxxx is displayed together, which prompts the user.

In addition to the above several implementation manners, the S-CSCF-1 may add the first information in the second call request, and may also have other addition manners as long as the first information can be added in the second call request, and the manner of adding the first information is not limited in the embodiment of the present application.

S410, the S-CSCF-1 routes the third call request to the S-CSCF-2 serving the second terminal equipment according to the called number in the third call request, and then the S-CSCF-2 receives the third call request from the S-CSCF-1.

And S411, the S-CSCF-2 sends the third call request to the second terminal equipment, and the second terminal equipment receives the third call request from the S-CSCF-2.

There may be other devices between the S-CSCF-2 and the second terminal device, and the third call request sent by the S-CSCF-2 to the second terminal device needs to be relayed through these intermediate devices, so that the request message reaching the second terminal device may not completely coincide with the third call request. The first call request includes headers such as the P-Asserted-Identity and from header fields, as well as the third call request, and also includes the first information. When understood, the first call request may be considered to include all or part of the content of the third call request.

And S412, the second terminal device outputs the incoming call information, and the incoming call information can prompt that the calling device is abnormal. The calling device is the first terminal device.

For example, if the second terminal device receives the first call request, an incoming call prompt may be performed on the user, for example, incoming call information may be output according to the first call request, where the incoming call information is output, for example, by displaying the incoming call information through a display unit of the second terminal device, S412 may also be understood that the second terminal device displays the incoming call information on the display unit, and the incoming call information may prompt that the calling device is abnormal (or understand that the incoming call information includes information for prompting that the calling device is abnormal), or the incoming call information may prompt that the calling device is in an international roaming state (or understand that the incoming call information includes information for prompting that the calling device is in the international roaming state).

The incoming call information includes, for example, an incoming call number, or called a calling number, that is, the number of the calling device. The second terminal device can display the incoming call number, can display answering options and/or hang-up options when displaying the incoming call information, and can output ring tones and the like through the audio output unit to prompt the user. In addition, since the first call request further includes the first information, the incoming call information in the embodiment of the present application may include the prompt information, and the prompt information is obtained according to the first information. Then, the incoming call information output by the second terminal device also includes prompt information, for example, the prompt information is also displayed on the display unit of the second terminal device, so that the user can also see the prompt information when checking the incoming call to determine whether to answer the incoming call.

In this embodiment of the application, the calling device may be prompted to have an abnormality through the prompting information (for example, it is understood that information included in the incoming call information and used for prompting that the calling device has an abnormality is prompting information, or information included in the incoming call information and used for prompting that the calling device is in an international roaming state is prompting information), or the calling device may be prompted to have an abnormality together with information such as an incoming call number included in the prompting information and the incoming call information (for example, it is understood that information included in the incoming call information and used for prompting that the calling device has an abnormality is prompting information and other information included in the incoming call information, or information included in the incoming call information and used for prompting that the calling device is in an international roaming state is other information included in the prompting information and the incoming call information).

As a first prompting mode of the incoming call information, the incoming call information may prompt that the calling device is in an international roaming state. For example, the prompt message included in the incoming call message includes a roaming tag, which may prompt the calling device to be in an international roaming state. The first prompting method can be considered as a method for prompting the calling device for abnormality through prompting information. For example, if the S-CSCF-1 adopts the (3) th addition form in the first implementation manner of adding the first information in the second call request described in S409, or the S-CSCF-1 adopts the (c) th addition form in the second implementation manner of adding the first information in the second call request described in S409, the incoming call information may prompt the calling device to be in the international roaming state. Since the telephone number in the country can not be taken to the foreign country for direct use, if the calling device is in the international roaming state, it is necessary to be vigilant that the incoming call may be a fraudulent call, which is an abnormal expression form of the calling device.

Referring to fig. 5A, a schematic diagram of an incoming call information prompt that a calling device is in an international roaming state is shown. Fig. 5A shows a display interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. The second terminal device may also display the home location of the incoming call number, for example, guizhou anshun, which is displayed by the second terminal device according to normal rules. Of course, the second terminal device may not display the home location of the caller id, and fig. 5A illustrates the display of the home location. In addition, since the first call request includes the first information, the incoming call information also includes the prompt information, and the second terminal device also displays the prompt information when displaying the incoming call information, and at this time, the prompt information includes a roaming tag, for example, characters that the roaming tag is "international roaming", so that the user can be prompted. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged.

As a second way of prompting the incoming call information, the incoming call information may prompt the name of the roaming place of the calling device. For example, if the S-CSCF-1 adopts the (1) th addition form in the first implementation manner of adding the first information in the second call request described in S409, or the S-CSCF-1 adopts the (a) th addition form in the second implementation manner of adding the first information in the second call request described in S409, the incoming call information may prompt the name of the roaming destination of the calling device. Since the telephone number in the country is not taken to the foreign country for direct use, if the roaming place of the calling device is foreign, it is necessary to be alert that the incoming call may be a fraudulent call, which is an abnormal representation form of the calling device.

Referring to fig. 5B, a schematic diagram of prompting the calling device for the roaming location name of the incoming call information is shown. Fig. 5B shows a display interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. The second terminal device may also display the home location of the incoming call number, for example, guizhou anshun, which is displayed by the second terminal device according to normal rules. Of course, the second terminal device may not display the home location of the caller id, and fig. 5B illustrates the display of the home location. Further, since the first call request includes the first information, the incoming call information also includes the prompt information, and the second terminal device also displays the prompt information when displaying the incoming call information, for example, the prompt information is "cambodia", which is an example of the roaming region of the first terminal device being cambodia, and the three words "cambodia" are also displayed on the display unit of the second terminal device, so that the user can be prompted. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged. It can be seen that the second prompting manner is equivalent to combining the prompting message and other contents (such as the incoming call number and/or the attribution of the incoming call number) included in the incoming call message to prompt that the abnormality exists in the calling device.

The incoming call information is to prompt the name of the roaming place of the calling device, and one way is as described above, and the prompt information includes the name of the roaming place of the calling device. Or in another way, the prompt message includes the name of the roaming place of the calling device and includes a roaming tag. For example, if the S-CSCF-1 adopts the (2) th addition form in the first implementation of adding the first information in the second call request described in S409, or the S-CSCF-1 adopts the (b) th addition form in the second implementation of adding the first information in the second call request described in S409, the prompt information includes the name of the roaming place of the calling device and includes the roaming tag.

Referring to fig. 5C, a schematic diagram of the calling device roaming location name and roaming tag is included for the prompt message. Fig. 5C shows a display interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. The second terminal device may also display the home location of the incoming call number, for example, guizhou anshun, which is displayed by the second terminal device according to normal rules. Of course, the second terminal device may not display the home location of the caller id, and fig. 5C illustrates the display of the home location. In addition, since the first call request includes the first information, the incoming call information further includes the prompt information, and the second terminal device also displays the prompt information when displaying the incoming call information, for example, the prompt information is "roaming in cambodia", which is exemplified by two characters that the roaming place of the first terminal device is cambodia and the roaming label is "roaming". The five characters "roaming in cambodia" are also displayed on the display unit of the second terminal device together, so that the user can be prompted. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged. It can be seen that the prompting mode is equivalent to prompt that the calling equipment has abnormality through the prompting information, and prompting is not required to be performed in combination with other contents of the incoming call information.

As a third prompting mode of the incoming call information, the incoming call information may prompt a country code of a roaming place of the calling device. For example, if the S-CSCF-1 adopts the (4) th addition form in the first implementation manner of adding the first information in the second call request described in S409, or the S-CSCF-1 adopts the (d) th addition form in the second implementation manner of adding the first information in the second call request described in S409, the incoming call information may prompt the country code of the roaming destination of the calling device. Since the phone number in the country is not available for direct use, if the country code of the roaming place of the calling device is the country code of other countries, it is necessary to be alerted that the incoming call may be a fraudulent call, which is an abnormal expression form of the calling device. The third prompting mode can be considered to combine the prompting information and other contents (such as the incoming call number and/or the attribution of the incoming call number) included in the incoming call information to prompt that the abnormality exists in the calling device.

Referring to fig. 5D, a schematic diagram of the country code of the roaming location of the calling device is shown for prompting the incoming call information. Fig. 5D shows an interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. The second terminal device may also display the home location of the incoming call number, for example, guizhou anshun, which is displayed by the second terminal device according to normal rules. Of course, the second terminal device may not display the home location of the caller id, and fig. 5D illustrates the display of the home location. In addition, since the first call request includes the first information, the incoming call information also includes the prompt information, and the second terminal device also displays the prompt information when displaying the incoming call information, for example, the prompt information is "00855", which is an example of MCC of the roaming place of the first terminal device being 00855, and a string of digits of "00855" is also displayed on the display unit of the second terminal device, for example, two lines of digits are displayed with the incoming call number, so that the user can be prompted. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged.

Or, if the third implementation manner of adding the first information in the second call request described in S409 is adopted by the S-CSCF-1, the incoming call information may also prompt the country code of the roaming location of the calling device. The prompting mode is equivalent to combining the prompting information and other contents (such as an incoming call number) included by the incoming call information to prompt that the calling equipment has an abnormality.

Referring to fig. 5E, a schematic diagram of the country code of the roaming location of the calling device is shown for prompting the incoming call information. Fig. 5E shows an interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. In addition, since the first call request includes the first information, the incoming call information also includes the prompt information, and the second terminal device also displays the prompt information when displaying the incoming call information. For example, the first information is "00855", and the first information is added to the tel field in the P-Asserted-Identity of the first call request, so that the second terminal device displays the prompt information together with the incoming call number, and the prompt information may be displayed before the incoming call number, for example, "+ 855182 XXXXXXXX" is displayed by the second terminal device, which is illustrated in the case that the MCC of the roaming place of the first terminal device is 00855, so that the user can be prompted. The second terminal device may also display the attribution of the incoming call number, because the country code is also a part of the incoming call number at this time, so the second terminal device may consider the country code when determining the attribution, and thus the attribution of the incoming call number determined by the second terminal device is cambodia, which is a display performed by the second terminal device according to normal rules. Of course, the second terminal device may not display the home location of the caller id, and fig. 5E illustrates the display of the home location. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged.

As a fourth prompting method of the incoming call information, the incoming call information may prompt the name of the roaming-site operator of the calling device. For example, if the S-CSCF-1 adopts the (5) th addition form in the first implementation manner of adding the first information in the second call request described in S409, or the S-CSCF-1 adopts the (e) th addition form in the second implementation manner of adding the first information in the second call request described in S409, the incoming call information may prompt the name of the roaming destination of the calling device. Since the telephone number in the country is not taken to the foreign country for direct use, if the roaming place of the calling device is foreign, it is necessary to be alert that the incoming call may be a fraudulent call, which is an abnormal representation form of the calling device.

Referring to fig. 5F, a schematic diagram of prompting the calling device for the name of the roaming operator of the calling device for the incoming call information is shown. Fig. 5F shows a display interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. The second terminal device may also display the home location of the incoming call number, for example, guizhou anshun, which is displayed by the second terminal device according to normal rules. Of course, the second terminal device may not display the home location of the caller id, and fig. 5F illustrates the display of the home location. Further, since the first call request includes the first information, the incoming call information also includes the presentation information, and the second terminal device displays the presentation information together when displaying the incoming call information, for example, the presentation information is "Mfone", which is an example of the first terminal device being in cambodia in roaming and Mfone in the roaming operator, "Mfone" is also displayed on the display unit of the second terminal device, so that the user can be presented. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged. It can be seen that the fourth prompting manner can be considered to combine the prompting information and other content included in the incoming call information (e.g. the incoming call number and/or the home location of the incoming call number) to prompt that the abnormality exists in the calling device.

As a fifth prompting manner of the incoming call information, the incoming call information may prompt the identifier of the PLMN of the roaming location of the calling device. For example, if the S-CSCF-1 adopts the (6) th addition form in the first implementation manner of adding the first information in the second call request described in S409, or the S-CSCF-1 adopts the (f) th addition form in the second implementation manner of adding the first information in the second call request described in S409, the incoming call information may prompt the identifier of the PLMN of the roaming destination of the calling device. Since the telephone number in the country is not taken to the foreign country for direct use, if the roaming place of the calling device is foreign, it is necessary to be alert that the incoming call may be a fraudulent call, which is an abnormal representation form of the calling device.

Referring to fig. 5G, a schematic diagram of prompting the calling device for the identifier of the PLMN of the roaming destination for the incoming call information is shown. Fig. 5G shows an interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. The second terminal device may also display the home location of the incoming call number, for example, guizhou anshun, which is displayed by the second terminal device according to normal rules. Of course, the second terminal device may not display the home location of the caller id, and fig. 5G illustrates the display of the home location. Further, since the first call request includes the first information, the incoming call information also includes the prompt information, and the second terminal device displays the prompt information together when displaying the incoming call information, for example, the prompt information is "232-03", which is an example where MCC of the roaming place of the first terminal device is 232 and MNC is 03, and "232-03" is also displayed together on the display unit of the second terminal device, thereby being able to prompt the user. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged. The fifth prompting mode can be considered to combine the prompting information and other contents (such as the incoming call number and/or the attribution of the incoming call number) included in the incoming call information to prompt that the abnormality exists in the calling device.

As a sixth prompting manner of the incoming call information, the incoming call information can prompt that the current incoming call is a suspected fraud call. The sixth prompting mode can be considered as prompting that the calling equipment is abnormal through the prompting information without combining other contents of the incoming call information for prompting. For example, if the S-CSCF-1 adopts any one of the first implementation manners of adding the first information to the second call request described in S409, or the S-CSCF-1 adopts any one of the second implementation manners of adding the first information to the second call request described in S409, the incoming call information may prompt that the incoming call is a suspected fraud call. Because the general domestic telephone number can not be taken to the foreign country for direct use, if the roaming place of the calling device is foreign, the second terminal device can directly prompt the incoming call as a suspected fraud call, so that the prompt for the user is more striking.

Referring to fig. 5H, a schematic diagram of the incoming call information indicating that the incoming call is a suspected fraud call is shown. Fig. 5H shows an interface of the display unit of the second terminal device, which displays the incoming call information, for example, the second terminal device displays the incoming call number, which is the number carried in the tel field in the P-Asserted-Identity of the first call request, for example, 182 XXXXXXXX. The second terminal device may also display the home location of the incoming call number, for example, guizhou anshun, which is displayed by the second terminal device according to normal rules. Of course, the second terminal device may not display the location of the incoming call number, and fig. 5H illustrates the display of the location. In addition, since the first call request includes the first information, the incoming call information also includes the prompt information, and the second terminal device displays the prompt information together when displaying the incoming call information, for example, several characters of the prompt information "suspected fraud call" and "suspected fraud call" are also displayed together on the display unit of the second terminal device, so that the user can be prompted. For example, if the user thinks the incoming call is a fraud call, the user can choose not to answer the call, so as to reduce the possibility that the personal and property safety is damaged.

Or, in addition to the above several implementation manners, the prompt information may also prompt other content, and the embodiment of the present application is not limited.

As an alternative implementation manner, before the second terminal device outputs the prompt message, the incoming call number may be matched with a number stored in the second terminal device to determine whether the incoming call number is a number familiar to the user. For example, the second terminal device may match the incoming number one by one with all or part of the numbers stored by the second terminal device, and the all or part of the numbers may include one or more numbers other than the numbers in the black list stored by the second terminal device, and thus the all or part of the numbers may also be referred to as valid numbers. If the incoming call number fails to match with the valid numbers, or if the second terminal device determines that the incoming call number is not stored in the second terminal device, the second terminal device may display the incoming call information in the above manner. However, if the incoming call number is successfully matched with one or more valid numbers stored in the second terminal device, or the incoming call number is stored in the second terminal device, the current incoming call may be an acquaintance's telephone, and the second terminal device may not display the incoming call information according to the above-mentioned manner, but may display the incoming call information according to a normal rule, for example, the number of the calling device may be displayed, the home location of the calling device may be displayed, and the like. In other words, if the incoming call number is successfully matched with one or more valid numbers stored in the second terminal device, or the incoming call number is stored in the second terminal device, the second terminal device may not need to display the prompt message, so as to prevent the user from missing the incoming call due to the acquaintance's phone being mistaken as a fraudulent phone.

That is, the second terminal device displays the incoming call information regardless of whether the second terminal device is successfully matched or whether the incoming call number is stored in the second terminal device, but the incoming call information displayed by the second terminal device is different, if the second terminal device is not successfully matched or if the incoming call number is stored in the second terminal device, the incoming call information displayed by the second terminal device includes the prompt information, and if the second terminal device is successfully matched or if the incoming call number is not stored in the second terminal device, the incoming call information displayed by the second terminal device does not include the prompt information. For the sake of distinction, the incoming call information including the prompt information may be referred to as first incoming call information, and the incoming call information not including the prompt information may be referred to as second incoming call information. Then, if the second terminal device fails to match, or if the incoming call number is stored in the second terminal device, the second terminal device displays the first incoming call information, or if the incoming call number is not stored in the second terminal device, the second terminal device displays the second incoming call information.

If the S-CSCF-1 adopts any one of the first implementation manners of adding the first information to the second call request described in S409, or the S-CSCF-1 adopts any one of the second implementation manners of adding the first information to the second call request described in S409, when the second terminal device matches the incoming number with one of the valid numbers stored in the second terminal device, the second terminal device may perform matching according to a sequence from a tail of the number to a head of the number, that is, a sequence from back to front, or may perform matching according to a sequence from a head of the number to a tail of the number, that is, a sequence from front to back.

Or, if the S-CSCF-1 adopts the third implementation manner of adding the first information in the second call request described in S409, when the second terminal device matches the incoming number with a number stored in the second terminal device, the second terminal device may match the incoming number in the order from the tail of the number to the head of the number as much as possible, that is, the matching is performed in the order from the back to the front. Alternatively, the second terminal device may match the characters of the last preset bits of the second field (or, the third field) with a valid number stored by the second terminal device, or the second terminal device may match the characters of the last preset bits of the second field (or, the third field) with a number (including, for example, a valid number and/or a blacklist number) locally stored by the second terminal device. The characters of the last preset digit in the second field (or the third field) are, for example, the calling number, and the other characters except the characters of the last preset digit in the second field (or the third field) do not belong to the calling number, for example, belong to the prompt message, or belong to the first message, for example, the MCC, and the terminal device generally does not store the MCC when storing the number, so if the second field (or the third field) is matched in the order from front to back, or the matching content includes other systems except the characters of the last preset digit in the second field (or the third field), matching failure may be caused, and therefore, matching is performed in the order from back to front, or the characters of the last preset digit are matched, so that the matching success rate can be improved.

S413, the second terminal device sends a response message, and the response message is routed to the first terminal device. The response message may also be referred to as a response message of the first call request, or as a response message of the second call request, or as a response message of the third call request. For example, the response message is routed to S-CSCF-2, S-CSCF-2 routes the response message to S-CSCF-1, and S-CSCF-1 routes the response message to the first terminal device.

The response message is, for example, a 200OK message if the second terminal device performs an operation to answer the incoming call. Upon receiving the 200OK message, the first terminal hears the voice from the called party. Or, if the second terminal device does not perform an operation of answering the incoming call, that is, the user does not answer the incoming call, that is, the second terminal device does not detect a response operation to the first call request, optionally, the second terminal device may further output missed call information, and the way of outputting the missed call information is, for example, displaying the missed call information through the display unit. For example, the missed call information may also include a prompt message, and the content of the prompt message included in the missed call information is similar to the content of the prompt message included in the incoming call information, so that the content of the missed call information displayed by the second terminal device is also similar to the content of the displayed incoming call information, which can be referred to the above description. Namely, even if the user temporarily fails to answer the call, the second terminal device can prompt the user through the missed call information, and the user does not need to call back the suspected fraud calls, so that the telephone charge is saved, and the personal and property safety of the user can be guaranteed.

In this embodiment, if it is determined that the first terminal device is in the international roaming state, the first information may be added to the second call request to indicate that the first terminal device is in the international roaming state. The second terminal device is, for example, a called party, and the second terminal device can prompt the user when displaying the incoming call information so as to prevent the user from being cheated. Therefore, through the mode provided by the embodiment of the application, the called party can know the fraud call as long as the calling party is in the international roaming state, so that corresponding prompt measures can be provided, the efficiency of determining the fraud call is higher, the fraud call can be determined only by dialing once without dialing for many times, and the method is more effective for guaranteeing personal and property safety of the user.

Next, a second communication method is provided in the embodiment of the present application, please refer to fig. 6, which is a flowchart of the method. In the following description, the method is applied to the network architecture shown in fig. 2 or fig. 3 as an example.

For ease of description, in the following, the method is performed by a network device and a terminal device as an example. The first terminal device (or, the calling device) described below is a terminal device in the network architecture shown in fig. 2 or fig. 3, the first core network device described below is, for example, a UDM or an HSS in the network architecture shown in fig. 2 or fig. 3, the second core network device described below is capable of providing a mobility management service for the first terminal device, for example, an AMF or an MME in the network architecture shown in fig. 2 or fig. 3, and the third core network device described below is, for example, an AS (e.g., a TAS) in the network architecture shown in fig. 2 or fig. 3. The AS is not strictly a core network device, but the embodiments of the present application are only named AS such. Alternatively, the first core network device may be referred to AS a first network device, the second core network device may be referred to AS a second network device, and the third core network device may be referred to AS a third network device. The first core network device, the second core network device and the third core network device are all core network devices serving the first terminal device. The following also relates to S-CSCF-2, which is an S-CSCF serving the second terminal device, which is the called device. And in the following, the first core network device is UDM or HSS, the second core network device is AMF or MME, and the third core network device is TAS are taken as examples.

S601, the first terminal device registers in the current network according to the registration process.

For example, if the network where the first terminal device is located is a 4G network, the first terminal device may register according to a registration procedure of the 4G network, or if the network where the first terminal device is located is a 5G network, the first terminal device may register according to a registration procedure of the 5G network. The registration process may refer to a registration process of a 4G network or a registration process of a 5G network, which is not described herein in detail.

S602, the first terminal device initiates registration in the IMS network. For example, it is shown that the first terminal device sends a registration request message, which is routed to the S-CSCF-1, S-CSCF-1 within the home network of the first terminal device to receive the registration request message from the first terminal device. This registration request message is referred to as registration request message 1, for example.

And S603, the S-CSCF-1 replaces the first terminal equipment to register to a third party server, for example, the S-CSCF-1 sends a register request message to the TAS, and the TAS receives the register request message from the S-CSCF-1. This registration request message is referred to as registration request message 2, for example. The registration request message 1 and the registration request message 2 may be the same registration request message, or the contents of the two registration request messages may be different.

A plurality of APPs are possibly installed on the terminal equipment, each APP is provided with a corresponding application server, and the application servers can provide services for the corresponding APP services. Then the terminal device needs to register to the application server for normal service, and the S-CSCF-1 can replace the terminal device to register. A terminal device may need to register with one or more application servers, but the process of registering the terminal device with each application server is similar, so here the example of registering the terminal device with a TAS is taken.

S604, if the network is a 5G network, the TAS sends a subscription information request message to the UDM, and the UDM receives the subscription information request message from the TAS. Or, if the network is a 4G network, the TAS sends a subscription information request message to the HSS, and the HSS receives the subscription information request message from the TAS.

The subscription information request message is used for requesting to obtain subscription information of the first terminal device. The subscription information request message is, for example, a user data request (user data request) message, or may be another message.

And S605, if the network is a 5G network, the UDM determines that the first terminal equipment is in the international roaming state according to the PLMN identification or the country code obtained from the identification of the AMF serving the first terminal equipment. Or, if the terminal equipment is a 4G network, the HSS determines that the first terminal equipment is in the international roaming state according to the PLMN identifier or the country code obtained from the identifier of the MME serving the first terminal equipment. The PLMN identity includes, for example, MCC and MNC.

For more on S605, reference may be made to the description of S404 in the embodiment shown in fig. 4.

And S606, if the network is a 5G network, the UDM sends first subscription information to the TAS, and the TAS receives the first subscription information from the UDM. Or, if the network is a 4G network, the HSS sends the first subscription information to the TAS, and the TAS receives the first subscription information from the HSS.

For more contents of S606, for example, the indication manner of the indication information, etc., reference may be made to the description of S405 in the embodiment shown in fig. 4.

S607, TAS records the instruction information.

For more contents of S607, for example, how to record the instruction information, etc., reference may be made to the description of S406 in the embodiment shown in fig. 4.

S608, the TAS sends a first registration response message to the S-CSCF-1, and the S-CSCF-1 receives the first registration response message from the TAS. The first registration response message may also be referred to as the response message of registration request message 2. The first registration response message may indicate that the terminal device has successfully registered or failed to register at the TAS. The first registration response message is, for example, a 200OK message.

And S609, the S-CSCF-1 sends a second registration response message to the first terminal equipment, and the first terminal equipment receives the second registration response message from the S-CSCF-1. The second registration response message may also be referred to as a response message of registration request message 1.

The second registration response message indicates, for example, that the registration is successful, or indicates that the registration is failed. Here, the registration refers to registration of the first terminal device in the IMS network, and therefore, if the second registration response message indicates that the registration is successful, it indicates that the registration of the first terminal device in the IMS network is successful, and if the second registration response message indicates that the registration is failed, it indicates that the registration of the first terminal device in the IMS network is failed. The second registration response message is, for example, a 200OK message.

S610, the first terminal equipment sends a second call request, the second call request is routed to the S-CSCF-1, and then the S-CSCF-1 receives the second call request from the first terminal equipment. The second call request may be for the first terminal device to call the second terminal device.

S610 may be executed when the first terminal device needs to make a call, for example, the first terminal device makes a call to the second terminal device, and the second call request is used to call the second terminal device. The second call request is, for example, an invite message, or may be another message. At this time, the first terminal device may be referred to as a calling device, and the second terminal device may be referred to as a called device.

S611, the S-CSCF-1 sends the second call request to the TAS, and the TAS receives the second call request from the S-CSCF-1.

If the first terminal equipment is registered to one or more application servers, the S-CSCF-1 needs to send the request message from the first terminal equipment to the application servers respectively, each application server sends the processed message to the S-CSCF-1 after finishing the reprocessing, and the S-CSCF-1 obtains a request message according to the processed messages of all the application servers and sends the request message to the second terminal equipment. The S-CSCF-1 sends the request message from the first terminal device to each application server registered by the first terminal device, and each application server sends the processed message to the S-CSCF-1 after the re-processing is completed.

And S612, the TAS determines that the first terminal equipment is in the international roaming state, and the TAS adds the first information in the second call request to obtain a third call request.

For more contents of S612, for example, how the TAS determines whether the first terminal device is in the international roaming state, how the TAS adds the first information in the second call request, and the like, reference may be made to the description of S409 in the embodiment shown in fig. 4.

S613, the TAS sends the third call request to the S-CSCF-1, and the S-CSCF-1 receives the third call request from the TAS.

S614, S-CSCF-1 routes the third call request to S-CSCF-2 serving the second terminal device according to the called number in the third call request, and then S-CSCF-2 receives the third call request from S-CSCF-1.

In fact, if the first terminal device is registered to multiple application servers, the S-CSCF-1 will send the second call request to each of the multiple application servers, and the S-CSCF-1 will generate a request message to be sent to the second terminal device according to a message fed back by each application server, so the request message sent by the S-CSCF-1 to the second terminal device may or may not be the third call request, and here, the request message sent by the S-CSCF-1 to the second terminal device is taken as an example of the third call request.

And S615, the S-CSCF-2 sends the third call request to the second terminal equipment, and the second terminal equipment receives the third call request from the S-CSCF-2.

And S616, the second terminal device outputs the incoming call information, and the incoming call information can prompt that the calling device is abnormal. The calling device is the first terminal device.

For more contents of S616, for example, how the second terminal device outputs the incoming call information, etc., reference may be made to the description of S412 in the embodiment shown in fig. 4.

S617, the second terminal device sends a response message, and the response message is routed to the first terminal device. The response message may also be referred to as a response message of the first call request, or as a response message of the second call request, or as a response message of the third call request. For example, the response message is routed to S-CSCF-2, S-CSCF-2 routes the response message to S-CSCF-1, and S-CSCF-1 routes the response message to the first terminal device.

For more about S617, reference may be made to the description of S413 in the embodiment shown in fig. 4.

In this embodiment, if it is determined that the first terminal device is in the international roaming state, the first information may be added to the second call request to indicate that the first terminal device is in the international roaming state. The second terminal device is, for example, a called party, and the second terminal device can prompt the user through the incoming call information to prevent the user from being cheated. Therefore, through the mode provided by the embodiment of the application, the called party can know the fraud call as long as the calling party is in the international roaming state, so that corresponding prompt measures can be provided, the efficiency of determining the fraud call is higher, the fraud call can be determined only by dialing once without dialing for many times, and the method is more effective for guaranteeing personal and property safety of the user. Moreover, the operation of adding the first information in the second call request may be performed by the S-CSCF, or may also be performed by an application server serving the first terminal device, or may also be performed by another device between the first terminal device and the second terminal device, which is more flexible.

The following describes an apparatus for implementing the above method in the embodiment of the present application with reference to the drawings. Therefore, the above contents can be used in the subsequent embodiments, and the repeated contents are not repeated.

Fig. 7 is a schematic block diagram of a communication device 700 according to an embodiment of the present application. Illustratively, the communication apparatus 700 is, for example, a core network device 700. Illustratively, the core network device 700 is capable of implementing the functions of the third core network device described in the embodiment shown in fig. 4 or the embodiment shown in fig. 6, and the third core network device is, for example, an S-CSCF-1 or a TAS. Alternatively, the core network device 700 can implement the function of the first core network device described in the embodiment shown in fig. 4 or the embodiment shown in fig. 6, where the first core network device is, for example, a UDM or an HSS.

The core network device 700 includes a transmitting unit 720, a receiving unit 730, and a processing unit 710. Illustratively, the core network device 700 may be a core network device, and may also be a chip applied in the core network device or other combined devices, components, and the like having the functions of the third core network device. When the core network device 700 is a core network device, the sending unit 720 may be a transmitter, the receiving unit 730 may be a receiver, the transmitter may include an antenna, a radio frequency circuit, and the like, and the receiver may also include an antenna, a radio frequency circuit, and the like. The transmitter and the receiver may be unified to form a transceiver, and the transceiver may implement functions of the transmitter and the receiver, or the transmitter and the receiver may be two separately deployed functional modules. The processing unit 710 may include a processor, such as a baseband processor, which may include one or more Central Processing Units (CPUs). When the core network device 700 is a component having the functions of the third core network device or the first core network device, the sending unit 720 may be a radio frequency unit, the receiving unit 730 may be a radio frequency unit, and the processing unit 710 may be a processor, such as a baseband processor. When the core network device 700 is a chip system, the transmitting unit 720 and the receiving unit 730 may be input and output interfaces of a chip (e.g., a baseband chip), and the processing unit 710 may be a processor of the chip system and may include one or more central processing units. It should be understood that the processing unit 710 in the embodiments of the present application may be implemented by a processor or a processor-related circuit component, the sending unit 720 may be implemented by a transmitter or a transmitter-related circuit component, and the receiving unit 730 may be implemented by a receiver or a receiver-related circuit component.

For example, the processing unit 710 may be configured to perform all operations performed by the third core network device in the embodiment shown in fig. 4 except transceiving operations, e.g., S406 and S409, and/or other processes for supporting the techniques described herein. The sending unit 720 may be configured to perform all sending operations performed by the third core network device in the embodiment shown in fig. 4, e.g., S403, S407, and S410, and/or other processes for supporting the techniques described herein. The receiving unit 730 may be configured to perform all receiving operations performed by the third core network device in the embodiment shown in fig. 4, such as S402, S405, and S408, and/or other processes for supporting the techniques described herein.

Also for example, processing unit 710 may be used to perform all operations performed by the third core network device in the embodiment shown in fig. 6, except transceiving operations, and/or other processes to support the techniques described herein. The sending unit 720 may be configured to perform all sending operations performed by the third core network device in the embodiment shown in fig. 6, for example, S603, S609, S611, and S614, and/or other processes for supporting the techniques described herein. The receiving unit 730 may be configured to perform all receiving operations performed by the third core network device in the embodiment shown in fig. 6, such as S602, S608, S610, and S613, and/or other processes for supporting the techniques described herein.

For another example, the processing unit 710 may be configured to perform all operations performed by the first core network device in the embodiment shown in fig. 4 except transceiving operations, e.g., S401 and S404, and/or other processes for supporting the techniques described herein. The transmitting unit 720 may be configured to perform all transmitting operations performed by the first core network device in the embodiment shown in fig. 4, e.g., S405, and/or other procedures for supporting the techniques described herein. The receiving unit 730 may be configured to perform all receiving operations performed by the first core network device in the embodiment shown in fig. 4, for example, S403, and/or other procedures for supporting the techniques described herein.

As another example, the processing unit 710 may be configured to perform all operations performed by the first core network device in the embodiment shown in fig. 6 except transceiving operations, e.g., S601 and S605, and/or other processes for supporting the techniques described herein. The transmitting unit 720 may be configured to perform all transmitting operations performed by the first core network device in the embodiment shown in fig. 6, e.g., S606, and/or other processes for supporting the techniques described herein. The receiving unit 730 may be configured to perform all receiving operations performed by the first core network device in the embodiment shown in fig. 6, e.g., S604, and/or other procedures for supporting the techniques described herein.

In addition, the transmitting unit 720 and the receiving unit 730 may be one functional module, which is called a transceiver module, and the transceiver module can perform both the transmitting operation and the receiving operation, for example, the transceiver module may be used to perform all the transmitting operation and the receiving operation performed by the third core network device or the first core network device in the embodiment shown in fig. 4 or the embodiment shown in fig. 6, for example, when the transmitting operation is performed, the transceiver module may be considered as the transmitting unit 720, and when the receiving operation is performed, the transceiver module may be considered as the receiving unit 730; alternatively, the sending unit 720 and the receiving unit 730 may also be two functional modules, the transceiver module may be regarded as a general term of the two functional modules, the sending unit 720 is configured to complete the sending operation, for example, the sending unit 720 may be configured to perform all sending operations executed by the third core network device or the first core network device in the embodiment shown in fig. 4 or the embodiment shown in fig. 6, and the receiving unit 730 is configured to complete the receiving operation, for example, the receiving unit 730 may be configured to perform all receiving operations executed by the third core network device or the first core network device in the embodiment shown in fig. 4 or the embodiment shown in fig. 6.

As to the functions that can be specifically realized by the processing unit 710, the sending unit 720 and the receiving unit 730, reference may be made to the description of the operation performed by the third core network device in the embodiment shown in fig. 4 or the embodiment shown in fig. 6, or reference may be made to the description of the operation performed by the first core network device in the embodiment shown in fig. 4 or the embodiment shown in fig. 6, which is not repeated here.

Fig. 8 is a schematic block diagram of a communication device 800 according to an embodiment of the present application. Exemplarily, the communication apparatus 800 is, for example, a second terminal device 800. The second terminal device 800 is illustratively capable of implementing the functionality of the second terminal device as described in the embodiment shown in fig. 4 or the embodiment shown in fig. 6.

The second terminal device 800 includes a receiving unit 830 and a processing unit 810, and optionally, the second terminal device may further include a transmitting unit 820 and a display module 840. With regard to the implementation of the second terminal device 800, reference may be made to the introduction to the implementation of the core network device 700.

For example, the processing unit 810 may be configured to perform all operations performed by the second terminal device in the embodiment shown in fig. 4 except for the transceiving operation and the display operation (or, the processing unit 810 may also instruct the display unit 840 to perform the display operation), for example, S411, and/or other processes for supporting the techniques described herein. Transmitting unit 820 may be used to perform all of the transmitting operations performed by the second terminal device in the embodiment shown in fig. 4, and/or other processes for supporting the techniques described herein. The receiving unit 830 may be used to perform all receiving operations performed by the second terminal device in the embodiment shown in fig. 4, e.g., S411, and/or other processes for supporting the techniques described herein. The display unit 840 may be used to perform all display operations performed by the second terminal device in the embodiment shown in fig. 4, for example, if the second terminal device 800 outputs incoming call information by displaying the incoming call information, the display unit 840 may perform S411 and/or other processes for supporting the techniques described herein.

For another example, the processing unit 810 may be configured to perform all operations performed by the second terminal device in the embodiment shown in fig. 6 except for the transceiving operation and the display operation (or, the processing unit 810 may also instruct the display unit 840 to perform the display operation), for example, S616, and/or other processes for supporting the techniques described herein. Transmitting unit 820 may be used to perform all of the transmitting operations performed by the second terminal device in the embodiment shown in fig. 4, and/or other processes for supporting the techniques described herein. The receiving unit 830 may be configured to perform all receiving operations performed by the second terminal device in the embodiment shown in fig. 6, e.g., S615, and/or other processes for supporting the techniques described herein. The display unit 840 may be used to perform all display operations performed by the second terminal device in the embodiment shown in fig. 6, for example, if the second terminal device 800 outputs incoming call information by displaying the incoming call information, the display unit 840 may perform S616, and/or other processes for supporting the techniques described herein.

In addition, regarding the implementation of the transmitting unit 820 and the receiving unit 830, reference may be made to the introduction of the implementation of the transmitting unit 720 and the receiving unit 730.

As to the functions that can be specifically realized by the processing unit 810, the sending unit 820, the receiving unit 830 and the display unit 840, reference may be made to the description of the operation performed by the second terminal device in the embodiment shown in fig. 4 or the embodiment shown in fig. 6, which is not repeated herein.

The embodiment of the application also provides a communication device, and the communication device can be terminal equipment or a circuit. The communication device may be configured to perform the actions performed by the terminal device in the above-described method embodiments.

When the communication device is a terminal device, fig. 9 shows a simplified structural diagram of the terminal device. For easy understanding and illustration, in fig. 9, the terminal device is exemplified by a mobile phone. As shown in fig. 9, the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input-output device. The processor is mainly used for processing communication protocols and communication data, controlling the terminal equipment, executing software programs, processing data of the software programs and the like. The memory is used primarily for storing software programs and data. The radio frequency circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user. It should be noted that some kinds of terminal devices may not have input/output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs baseband signals to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signals and sends the radio frequency signals to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal equipment, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data. For ease of illustration, only one memory and processor are shown in FIG. 9. In an actual end device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be provided independently of the processor, or may be integrated with the processor, which is not limited in this embodiment.

In the embodiment of the present application, an antenna and a radio frequency circuit having a transceiving function may be regarded as a transceiving unit of a terminal device (the transceiving unit may be a functional unit, and the functional unit is capable of implementing a transmitting function and a receiving function, or the transceiving unit may also include two functional units, which are respectively a receiving unit capable of implementing a receiving function and a transmitting unit capable of implementing a transmitting function), and a processor having a processing function may be regarded as a processing unit of the terminal device. As shown in fig. 9, the terminal device includes a transceiving unit 910 and a processing unit 920. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. A processing unit may also be referred to as a processor, a processing board, a processing module, a processing device, or the like. Optionally, a device for implementing a receiving function in the transceiving unit 910 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiving unit 910 may be regarded as a transmitting unit, that is, the transceiving unit 910 includes a receiving unit and a transmitting unit. A transceiver unit may also sometimes be referred to as a transceiver, transceiving circuitry, or the like. A receiving unit may also be referred to as a receiver, a receiving circuit, or the like. A transmitting unit may also sometimes be referred to as a transmitter, or a transmitting circuit, etc.

It should be understood that the transceiving unit 910 is configured to perform the transmitting operation and the receiving operation of the second terminal device side in the above-described embodiment shown in fig. 4 or the embodiment shown in fig. 6, and the processing unit 920 is configured to perform other operations besides the transceiving operation of the second terminal device side in the above-described embodiment shown in fig. 4 or the embodiment shown in fig. 6.

When the communication device is a chip-like device or circuit, the device may comprise a transceiver unit and a processing unit. The transceiver unit may be an input/output circuit and/or a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit.

The embodiment of the application provides a communication system. The communication system may include the second terminal device according to the embodiment shown in fig. 4, the third core network device according to the embodiment shown in fig. 4, and the first core network device according to the embodiment shown in fig. 4. Alternatively, the communication system may include the second terminal device according to the embodiment shown in fig. 6, the third core network device according to the embodiment shown in fig. 6, and the first core network device according to the embodiment shown in fig. 6.

The second terminal device is implemented by, for example, the second terminal device 800 in fig. 8, the third core network device is implemented by, for example, the core network device 700 in fig. 7, and the first core network device is implemented by, for example, the core network device 700 in fig. 7.

It should be understood that the processor mentioned in the embodiments of the present application may be a CPU, and may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should be noted that when the processor is a general-purpose processor, a DSP, an ASIC, an FPGA or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, the memory (memory module) is integrated in the processor.

It should be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. The computer readable storage medium can be any available medium that can be accessed by a computer. Taking this as an example but not limiting: a computer-readable medium may include a Random Access Memory (RAM), a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), a compact disc read-only memory (CD-ROM), a universal serial bus flash disk (universal serial bus flash disk), a removable hard disk, or other optical disk storage, magnetic disk storage media, or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. In addition, by way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), or direct rambus RAM (DR RAM).

The above description is only for the specific implementation of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

receiving a first call request;

displaying incoming call information on a display unit according to the first call request, wherein the incoming call information comprises: and the information is used for prompting the calling equipment to be in the international roaming state.

2. The method of claim 1, wherein the first call request further comprises first information indicating that the calling device is in an international roaming state.

3. The method of claim 2, wherein the first information is used for indicating that the calling device is in an international roaming state, and comprises:

the first information comprises a label indicating that the calling equipment is in an international roaming state; or the like, or, alternatively,

the first information is used for indicating the roaming place of the calling equipment.

4. The method of claim 3, wherein the first information is used for indicating a roaming place of the calling device, and comprises:

the first information is used for indicating the name of the roaming place of the calling equipment; or the like, or, alternatively,

the first information is used for indicating a country code of a roaming place of the calling equipment; or the like, or, alternatively,

the first information is used for indicating the name of a roaming place operator of the calling equipment; or

The first information is used for indicating the identification of a Public Land Mobile Network (PLMN) of a roaming place of the calling device.

5. The method according to any one of claims 2 to 4,

the first information is carried in a first field, and the first field is a field which is included in the first call request and has an Asserted Identity P-Asserted-Identity or is newly added from a from header field; or the like, or, alternatively,

the first information is carried in a first message header, and the first message header is a message header newly added in the first call request; or the like, or, alternatively,

the first information is carried in a second field, the second field is a field in P-Asserted-Identity included in the first call request, the second field is used for carrying the number of the calling device, and the first information is used for indicating the country code of the roaming place of the calling device; or the like, or, alternatively,

the first information is carried in a third field, the third field being a field within a from header field included in the first call request, the first information indicating a country code of a roaming place of the calling device.

6. The method according to any one of claims 1 to 5, wherein the incoming call information includes information for prompting that the calling device is in an international roaming state, and the method includes:

the incoming call information comprises information used for prompting that the calling equipment is in an international roaming state; or the like, or, alternatively,

the incoming call information comprises information used for prompting the name of the roaming place of the calling equipment; or the like, or, alternatively,

the incoming call information comprises information used for prompting a country code of a roaming place of the calling equipment; or the like, or, alternatively,

the incoming call information comprises information used for prompting the name of a roaming place operator of the calling equipment; or the like, or, alternatively,

the incoming call information comprises information for prompting the identifier of the PLMN of the roaming place of the calling equipment; or the like, or, alternatively,

the incoming call information comprises information used for prompting a service place and a home place of the calling equipment.

7. The method according to any one of claims 1 to 6, wherein the incoming call information includes a number of the calling device, and a home location of the number is domestic;

the displaying the incoming call information on the display unit includes:

displaying the number of the calling equipment and a roaming label of the calling equipment in an international roaming state on the display unit; or the like, or, alternatively,

displaying the number of the calling equipment and the roaming place of the calling equipment on the display unit; or the like, or, alternatively,

displaying the number of the calling equipment, the roaming place of the calling equipment and a label of the electronic equipment in an international roaming state on the display unit; or the like, or, alternatively,

displaying the number of the calling equipment on the display unit, and displaying the country code of the roaming place of the calling equipment in front of the number of the calling equipment; or the like, or, alternatively,

displaying the number of the calling equipment, the attribution of the calling equipment and the roaming place of the calling equipment on the display unit; or the like, or, alternatively,

displaying the number of the calling device and the name of the operator of the roaming place of the calling device on the display unit; or the like, or, alternatively,

displaying on the display unit a number of the calling device and an indication of suspected fraud calls.

8. The method according to any one of claims 1 to 7, wherein the displaying the incoming call information on a display unit comprises:

determining that the number of the calling device and the valid number stored in the called device fail to be matched, and displaying the incoming call information on the display unit, otherwise, displaying the number of the calling device on the display unit; or the like, or, alternatively,

and determining that the number of the calling equipment is not stored locally, and displaying the incoming call information on the display unit, otherwise, displaying the number of the calling equipment on the display unit.

9. The method of claim 8, further comprising:

10. The method according to any of claims 1 to 9, wherein after said receiving the first call request, the method further comprises:

11. A method of communication, comprising:

receiving a second call request from the first terminal device;

determining that the first terminal device is in an international roaming state, and adding first information in the second call request to obtain a third call request, wherein the first information is used for indicating that the first terminal device is in the international roaming state;

and sending the third call request to the second terminal equipment.

12. The method of claim 11, wherein the first information is used for indicating that the first terminal device is in an international roaming state, and comprises:

the first information comprises a label used for indicating that the first terminal equipment is in an international roaming state; or the like, or, alternatively,

the first information is used for indicating the roaming place of the first terminal equipment.

13. The method of claim 12, wherein the first information is used for indicating a roaming location of the first terminal device, and comprises:

the first information is used for indicating the name of the roaming place of the first terminal equipment; or the like, or, alternatively,

the first information is used for indicating the name of a roaming place of the first terminal equipment, and the first information further comprises a roaming tag; or the like, or, alternatively,

the first information is used for indicating a country code of a roaming place of the first terminal equipment; or the like, or, alternatively,

the first information is used for indicating the name of a roaming operator of the first terminal equipment; or

The first information is used for indicating the identifier of the PLMN of the roaming place of the first terminal equipment.

14. The method according to any one of claims 11 to 13, wherein adding the first information to the second call request to obtain a third call request comprises:

adding a first field in a P-Asserted-Identity or from header field included in the second call request to obtain the third call request, wherein the first field is used for bearing the first information; or the like, or, alternatively,

adding a first message header to the second call request to obtain the third call request, wherein the first message header is used for bearing the first information; or the like, or, alternatively,

adding the first information in a second field in the P-Asserted-Identity included in the second call request to obtain a third call request, wherein the second field is used for bearing the number of the first terminal equipment, and the first information is used for indicating the country code of the roaming place of the first terminal equipment; or the like, or, alternatively,

and adding the first information in a third field in a from header field included in the second call request to obtain the third call request, wherein the first information is used for indicating a country code of a roaming place of the first terminal equipment.

15. The method according to any one of claims 11 to 14, further comprising:

receiving a registration request message from the first terminal device;

16. The method of claim 15, wherein the indication information is used for indicating that the first terminal device is in an international roaming state, and comprises:

the indication information comprises a label used for indicating that the first terminal equipment is in an international roaming state; or the like, or, alternatively,

the indication information is used for indicating the roaming place of the first terminal equipment.

17. The method of claim 16, wherein the indication information is used for indicating a roaming location of the first terminal device, and comprises:

the indication information is used for indicating the identifier of the PLMN of the network currently registered by the first terminal equipment; or the like, or, alternatively,

the indication information is used to indicate an identifier of a second core network device currently serving the first terminal device, where the identifier of the second core network device includes an identifier of a PLMN of a network currently registered by the first terminal device, or the identifier of the second core network device includes a country code of a roaming place of the first terminal device, and the second core network device is used to provide a mobility management service for the first terminal device; or the like, or, alternatively,

the indication information is used for indicating the country code of the roaming place of the first terminal equipment.

18. A method of communication, comprising:

receiving a subscription information request message from a third core network device, wherein the subscription information request message is used for requesting subscription information of a first terminal device;

and sending first subscription information to the third core network device, wherein the first subscription information is subscription information of the first terminal device, and the first subscription information includes indication information, and the indication information is used for indicating that the first terminal device is in an international roaming state.

19. The method of claim 18, wherein the indication information is used for indicating that the first terminal device is in an international roaming state, and comprises:

20. The method of claim 19, wherein the indication information is used for indicating a roaming location of the first terminal device, and comprises:

21. The method of any one of claims 18 to 20, further comprising:

22. A terminal device, comprising:

one or more processors;

one or more memories;

and one or more computer programs, wherein the one or more computer programs are stored in the one or more memories, the one or more computer programs comprising instructions which, when executed by one or more processors of the terminal device, cause the terminal device to perform the method of any of claims 1-10.

23. A network device, comprising:

one or more processors;

one or more memories;

and one or more computer programs, wherein the one or more computer programs are stored in the one or more memories, the one or more computer programs comprising instructions which, when executed by one or more processors of the network device, cause the network device to perform the method of any of claims 11-17, or cause the network device to perform the method of any of claims 18-21.

24. A computer-readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 10, or causes the computer to perform the method of any one of claims 11 to 17, or causes the computer to perform the method of any one of claims 18 to 21.

25. A chip comprising one or more processors and a communications interface, the one or more processors being configured to read instructions to perform the method of any one of claims 1 to 10, or to perform the method of any one of claims 11 to 17, or to perform the method of any one of claims 18 to 21.