KR101908293B1 - VIRTUAL SUBSCIBER IDENTIFICATION MODULE AND VIRTUAL MOBILE DEVICE, VoIP COMMUNICATION METHOD THEREOF - Google Patents

VIRTUAL SUBSCIBER IDENTIFICATION MODULE AND VIRTUAL MOBILE DEVICE, VoIP COMMUNICATION METHOD THEREOF Download PDF

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Publication number
KR101908293B1
KR101908293B1 KR1020160017661A KR20160017661A KR101908293B1 KR 101908293 B1 KR101908293 B1 KR 101908293B1 KR 1020160017661 A KR1020160017661 A KR 1020160017661A KR 20160017661 A KR20160017661 A KR 20160017661A KR 101908293 B1 KR101908293 B1 KR 101908293B1
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South Korea
Prior art keywords
mobile terminal
virtual
identity module
subscriber identity
subscriber
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KR1020160017661A
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Korean (ko)
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KR20170096360A (en
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이승열
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이승열
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50—Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/508—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement
    • H04L41/5087—Network service management, e.g. ensuring proper service fulfilment according to agreements based on type of value added network service under agreement wherein the managed service relates to voice services
    • H04L29/10—
    • H04L67/18—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A virtual subscriber identity module and a virtual mobile terminal for providing a mobile communication service using a mobile terminal located in a country without using a roaming service of a mobile communication provider abroad, and a VoIP communication method using the same. The disclosed virtual subscriber identity module includes: a wireless communication unit that receives subscriber information from a virtual mobile terminal physically separated from a mobile terminal, the virtual mobile terminal being equipped with a subscriber identity module for the mobile terminal, using the wireless communication network; And an interface unit which is located in the domestic and transmits the subscriber information to the mobile terminal on which the virtual subscriber identity module is mounted, wherein the mobile terminal uses the mobile communication network for subscriber authentication and location registration, To the mobile communication server.

Description

TECHNICAL FIELD [0001] The present invention relates to a virtual subscriber identity module and a virtual mobile terminal, and a VoIP communication method using the virtual subscriber identity module and the virtual mobile terminal.

The present invention relates to a virtual subscriber identity module and a virtual mobile terminal and a VoIP communication method using the virtual subscriber identity module and the virtual mobile terminal. More particularly, the present invention relates to a VoIP communication method using a mobile terminal And a VoIP communication method using the virtual mobile terminal.

A roaming service is a service that enables communication in different service providers' service areas. If there are a large number of mobile communication carriers within a certain area, they are building independent service networks. Therefore, depending on the company, there may be areas where service is good and not good. In this case, it would be very convenient if the companies join each other and join any company, so that mutual service networks can connect with each other and receive quality service from anywhere. A service that broadens the quality and scope of services by cooperating with each other is called a roaming service.

Basically, there are two types of roaming service: domestic roaming and international roaming. Domestic roaming is literally done between domestic service providers. International roaming, on the other hand, is achieved through mutual cooperation of services performed between the state and the country, by concluding agreements between domestic and foreign operators. That is, it is international roaming that a subscriber of a domestic mobile phone can use his or her own telephone without going through a separate subscription procedure even if the subscriber goes abroad. If a Korean company has roaming service with a US or a Japanese company, the person joining the company will be able to carry their mobile phone to the US or Japan, .

International roaming service generally refers to a service between a domestic mobile communication service provider and an overseas mobile communication service provider that allows a customer to use his / her mobile communication terminal to make a call between the travel destination and another station through an agreement.

Especially, it is very convenient service for mobile phone users traveling abroad. However, in terms of service providers, roaming is a service that is neither simple nor easy. This is because there must be many complex technical interactions and administrative agreements. In other words, roaming agreements must be made between domestic and foreign carriers, and if crossing borders, it is only necessary to enter into an administrative and technical complex agreement with foreign service providers in the region.

In addition, since roaming service costs are high compared to domestic calls, service users are burdened, and efforts have been made to reduce roaming service costs. And VoIP services through messenger applications have been utilized.

However, such a VoIP service can not use a voice call / incoming service and a text service using a mobile phone number used by the user, and there is a restriction that a VoIP service is provided only between persons using a messenger application. To address these limitations, VoIP providers are paying for a way to make a call to a customer who does not use the application, by purchasing a separate communication number band. However, even in such a case, since the special communication number purchased by Skype is used instead of the mobile communication telephone number of the user, the called party can not confirm who the caller is.

Conversely, in order to receive a call to the mobile communication telephone number of the user through the application, the special communication number of the VoIP provider can be purchased for a fee, and the call to the telephone number of the user can be received through the call forwarding. However, at this time, the voice is called, but since the character is not received, there is a problem that the character can not be confirmed through the application

A related prior art document is Korean Patent Publication No. 2013-0101300.

The present invention relates to a virtual subscriber identity module and a virtual mobile terminal for providing a mobile communication service using a mobile terminal located in a country without using a roaming service of a mobile communication provider abroad, and a VoIP communication method using the same will be.

In addition, the present invention is intended to overcome the limitations of the modern mobile communication technology in which a subscriber identity module must be installed in a mobile terminal to utilize a mobile communication service, thereby giving mobility to the subscriber identity module.

According to another aspect of the present invention, there is provided a virtual subscriber identity module, comprising: a virtual mobile terminal, which is physically separated from a mobile terminal and includes a subscriber identity module for the mobile terminal, A wireless communication unit for receiving subscriber information using the subscriber information; And an interface unit which is located in the domestic and transmits the subscriber information to the mobile terminal on which the virtual subscriber identity module is mounted, wherein the mobile terminal uses the mobile communication network for subscriber authentication and location registration, To the mobile communication server.

According to another aspect of the present invention, there is provided a mobile communication system including a module mounting unit on which a subscriber identification module for a mobile terminal is mounted; An interface for communicating with the subscriber identity module; An information receiver for receiving a subscriber information request message transmitted from a virtual subscriber identity module installed in the mobile terminal; And an information transmitter for transmitting the subscriber information stored in the subscriber identity module to the virtual subscriber identity module.

According to another aspect of the present invention, there is provided a VoIP communication method for a mobile terminal, the method comprising: determining whether to install a virtual subscriber identity module; Requesting subscriber information from the virtual subscriber identity module; And performing subscriber authentication and location registration with the mobile communication server using the subscriber information received from the virtual subscriber identity module, wherein the virtual subscriber identity module includes a subscriber identity module for the mobile terminal And receiving subscriber information stored in the subscriber identity module from the virtual mobile terminal.

According to the present invention, a user of a mobile terminal can locate a mobile terminal in Korea, and can utilize a mobile terminal's mobile communication service without roaming service of a mobile communication provider using a virtual mobile terminal and a user terminal in a foreign country.

According to the present invention, it is possible to use the call and text service at a domestic call rate from abroad.

1 is a diagram for explaining a VoIP communication system according to an embodiment of the present invention.
2 is a view for explaining a virtual subscriber identity module according to an embodiment of the present invention.
3 is a view for explaining a virtual mobile terminal according to an embodiment of the present invention.
4 is a diagram for explaining a VoIP communication method of a mobile terminal according to an embodiment of the present invention.
5 is a view for explaining a VoIP communication method in a VoIP communication system according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram for explaining a VoIP communication system according to an embodiment of the present invention.

1, the VoIP communication system according to the present invention includes a mobile terminal 110, a virtual mobile terminal 130 and a user terminal 150.

The mobile terminal 110 may be a smart phone, a tablet PC, or the like as a terminal on which an application can be operated using a mobile communication service. The virtual mobile terminal 130 provides a subscriber identity module slot and may be a terminal supporting Internet communication. The user terminal 150 supports Internet communication and can be a smart phone, a tablet PC, a notebook computer, a desktop PC, or the like as a terminal on which an application can be operated.

A virtual subscriber identity module 120 is installed in the mobile terminal 110 located in the country. And the subscriber identity module 140 for the mobile terminal 110 is installed in the virtual mobile terminal 130. That is, the subscriber identity module 140 is physically separated from the mobile terminal 110 and mounted on the virtual mobile terminal 130. The virtual mobile terminal 130 may be located overseas as an embodiment.

The virtual subscriber identity module 120 is mounted in the subscriber identity module slot of the mobile terminal 110 and the interface of the virtual subscriber identity module 120 is the same as the interface of the subscriber identity module 140. That is, the virtual subscriber identity module 120 employs an interface for communicating with the mobile terminal of the subscriber identity module according to the standard.

Accordingly, the mobile terminal 110 can recognize that the virtual subscriber identity module 120 is mounted, but since the subscriber information is not stored in the virtual subscriber identity module 120, subscriber authentication and location registration can not be performed, The terminal 110 can not use the mobile communication service using the virtual subscriber identity module 120. [

The present invention is characterized in that a communication module is mounted in the virtual subscriber identity module 120 so that the mobile terminal 110 can use the mobile communication service using the virtual subscriber identity module 120, And receives the subscriber information stored in the subscriber identity module 140 from the virtual mobile terminal 130 using the network.

Therefore, according to the present invention, the mobile terminal 110 equipped with the virtual subscriber identity module 120 can perform subscriber authentication and location registration using the subscriber information of the subscriber identity module 140, and can use the mobile communication service .

The mobile terminal 110 and the user terminal 150 transmit or receive voice or text data through the Internet network. The mobile terminal 110 transmits voice or text data transmitted from the sender to the mobile terminal 110 to the user terminal 150 and receives voice or text data transmitted from the user terminal 150. [ The user terminal 150 receives voice or text data transmitted from the mobile terminal 110 and transmits voice or text data input to the user terminal 150 to the mobile terminal 110.

In other words, according to the present invention, the user of the mobile terminal 110 locates the mobile terminal 110 in the home country and uses the virtual mobile terminal 130 and the user terminal 150 in a foreign country without roaming service of the mobile communication provider, A mobile communication service of the mobile terminal 110 may be used. That is, according to the present invention, it is possible to use a call and text service at a domestic call rate from abroad.

Particularly, the present invention can be applied to the Internet of things, and a user can use a mobile communication service by providing a subscriber identity module and a virtual mobile terminal in a vehicle, for example, You do not need to sign up and you can use the Internet for things at an economical cost.

VoIP communication applications can be installed in the mobile terminal 110 and the user terminal 150, and voice and character data can be transmitted and received through the application for VoIP communication. In the VoIP communication system according to the present invention, a voice call origination, a voice call reception, a text sending, and a character receiving case using a user terminal will be described with reference to an application for VoIP communication. A VoIP communication application installed in the mobile terminal 110 is referred to as a first application and a VoIP communication application installed in the user terminal 150 is referred to as a second application.

< Voice call  Outbound>

When a user who is staying abroad sends a voice call through the second application of the user terminal 150, the voice call is transmitted to the mobile terminal 110 through the Internet network. The first application of the mobile terminal 110 located in the home requests a voice call origination to the mobile communication server, and a voice call is connected between the mobile terminal 110 and the called party.

The first application of the mobile terminal 110 transmits the voice data transmitted from the called party to the second application of the user terminal 150 and the second application of the user terminal 150 transmits the voice transmitted to the user terminal 150 And transmits the data to the first application of the mobile terminal 110.

< Voice call  Receive>

When a call is received to the mobile terminal 110 located in the country, the first application transmits the incoming call occurrence information to the second application. When the user transmits a call request for an incoming call to the first application through the second application, the mobile terminal 110 performs an incoming call. The first application transmits the voice data transmitted from the caller to the second application, and the second application transmits the voice data transmitted to the user terminal 150 to the first application.

&Lt; Character transmission >

When a user inputs a destination number through a second application and sends a character, a character origination request is transmitted to the first application. The mobile terminal 110 sends a text to the called number.

<Character reception>

When a character is received by the mobile terminal 110, the first application transmits the received character to the second application. The second application displays the received character, and the user can confirm the received character through the user terminal 150. [

Meanwhile, the present invention allows the virtual mobile terminal 130 to provide subscriber authentication and location registration results to the user terminal 150 in order to enhance the security of the VoIP communication. The user terminal 150 transmits voice and text data to the mobile terminal 110 when subscriber authentication and location registration are successful.

As a result, according to the present invention, voice and text data can be transmitted / received between the mobile terminal 110 and the user terminal when the virtual subscriber identity module 120 is normally loaded in the mobile terminal and subscriber authentication and location registration are successful , Security can be improved.

In particular, since roaming service uses a foreign mobile communication network, there is a risk of hacking by an overseas mobile communication service provider. However, since the present invention does not use a roaming service, security can be further improved.

2 is a view for explaining a virtual subscriber identity module according to an embodiment of the present invention.

2, the virtual subscriber identity module 120 includes a wireless communication unit 210 and an interface unit 220. The virtual communication subscriber identity module 120 includes a controller 230 and an encryption unit 240 according to an embodiment of the present invention. .

The wireless communication unit 210 is equipped with a subscriber identification module for the mobile terminal, and receives subscriber information from a virtual mobile terminal located overseas by using a wireless communication network. The subscriber information is stored in the subscriber identity module, and may include an International Mobile Subscriber Identity (IMSI), an authentication key, and the like.

The mobile terminal requests subscriber information from the virtual subscriber identity module for subscriber authentication and location registration, and the virtual subscriber identity module can request subscriber information from the virtual mobile terminal at the request of the mobile terminal. The mobile terminal transmits subscriber information to a mobile communication server using a mobile communication network to perform subscriber authentication and location registration.

The interface unit 220 is mounted with the virtual subscriber identity module 120 and transmits the subscriber information received to the mobile terminal located in the domestic. The virtual subscriber identity module 120 is installed in a subscriber identity module slot of the mobile terminal and the interface unit 220 is the same as the interface unit of the subscriber identity module. can do.

The control unit 230 determines whether the transmission signal transmitted from the mobile terminal is a signal for the subscriber identity module through the interface unit 220. The encryption unit 240 transmits the transmission signal, Encodes the signal. Since the subscriber information request signal is a signal for the subscriber identity module, the subscriber information request signal is encrypted by the encryption unit 240 and transmitted.

3 is a view for explaining a virtual mobile terminal according to an embodiment of the present invention.

3, the virtual mobile terminal 130 according to the present invention includes a module loading unit 310, an interface unit 320, an information receiving unit 330, and an information transmitting unit 340, And may further include a control unit and an encryption unit.

The module loading unit 310 is equipped with a subscriber identification module for the mobile terminal and the module loading unit 310 may be a slot having the same size as the subscriber identification module slot of the mobile terminal.

The interface unit 320 may communicate with the subscriber identity module and may have an interface with a standard for transmitting and receiving data with the subscriber identity module.

The information receiver 330 receives the subscriber information request message transmitted from the virtual subscriber identity module installed in the mobile terminal, and the information transmitter 340 transmits the subscriber information stored in the subscriber identity module to the virtual subscriber identity module.

The information receiving unit 330 can receive the subscriber authentication and location registration result for the subscriber information from the virtual subscriber identification module, and the information transmitting unit 340 transmits the subscriber authentication and location registration result to the mobile terminal through the VoIP communication To the user terminal.

Meanwhile, the control unit determines whether the signal to be transmitted is a signal to be transmitted to the mobile terminal, and the encryption unit encrypts the transmission signal according to the determination result of the control unit. For example, the control unit can determine whether the information request of the virtual subscriber identity module is an information request for the subscriber identity module, and the encryption unit can encrypt the subscriber information.

4 is a diagram for explaining a VoIP communication method of a mobile terminal according to an embodiment of the present invention.

The mobile terminal 110 according to the present invention determines whether the virtual subscriber identity module is mounted (S410). If it is determined that the virtual subscriber identity module is installed, the mobile terminal 110 requests subscriber information from the virtual subscriber identity module (S420) .

The virtual subscriber identity module receives the subscriber information stored in the subscriber identity module from the virtual mobile terminal equipped with the subscriber identity module for the mobile terminal. The mobile terminal 110 uses the subscriber information received from the virtual subscriber identity module, And performs subscriber authentication and location registration with the mobile communication server (S430).

The mobile terminal 110 and the user terminal can transmit and receive voice and text data to and from the user terminal using the stored VoIP application and can transmit and receive voice and text data according to subscriber authentication and location registration results.

Meanwhile, the mobile terminal 110 transmits subscriber authentication and location registration results to the virtual mobile terminal, and the user terminal receives subscriber authentication and location registration results from the virtual mobile terminal.

5 is a view for explaining a VoIP communication method in a VoIP communication system according to an embodiment of the present invention.

The mobile terminal 110 requests subscriber information from the virtual subscriber identity module 120 installed for subscriber authentication and location registration in operation S501 and the virtual subscriber identity module 120 transmits the subscriber information to the virtual mobile terminal 130 (S502). The virtual mobile terminal 130 requests subscriber information from the installed subscriber identity module 140 in step S503 and the subscriber identity module 140 transmits the stored subscriber information to the virtual mobile terminal 130 using the wireless Internet network (S504). The virtual mobile terminal 130 transmits the subscriber information to the virtual subscriber identity module 120 using the wireless Internet network in step S505 and the virtual subscriber identity module 120 transmits the subscriber information to the mobile terminal 110 in step S506 )do.

The mobile terminal 110 performs subscriber authentication and location registration using the subscriber information (S507), and transmits subscriber authentication and location registration results to the virtual mobile terminal 130 (S508). Subscriber authentication and location registration results may be transmitted to virtual mobile terminal 130 via virtual subscriber identity module 120.

The virtual mobile terminal 130 transmits the subscriber authentication and location registration result to the user terminal 150 in step S509 and the user terminal 150 transmits the voice and text data to the mobile terminal 110, (S510). When the subscriber authentication and the location registration are successful, the mobile terminal 110 can use the mobile communication service, and thus transmits the character or voice data received to the mobile terminal 110 to the user terminal 150 or to the mobile terminal 110 And transmit character or voice data of the transmitted user terminal 150 to the mobile communication server.

The above-described technical features may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (10)

A virtual subscriber identity module comprising:
A wireless communication unit for receiving subscriber information from a virtual mobile terminal physically separated from the mobile terminal and equipped with a subscriber identity module for the mobile terminal using a wireless communication network; And
And a first interface unit for transmitting the subscriber information to the mobile terminal on which the virtual subscriber identity module is installed,
The mobile terminal using the mobile communication service transmits the subscriber information to the mobile communication server using a mobile communication network for subscriber authentication and location registration, transmits and receives voice and text data to and from a user terminal provided by the user,
The virtual mobile terminal comprises:
A module mounting unit on which a subscriber identification module for the mobile terminal is mounted;
A second interface for communicating with the subscriber identity module;
An information receiver for receiving a subscriber information request message transmitted from the virtual subscriber identity module; And
And an information transmission unit for transmitting the subscriber information stored in the subscriber identity module to the virtual subscriber identity module
Virtual subscriber identity module.
The method according to claim 1,
The virtual subscriber identity module
A subscriber identification module slot in the mobile terminal,
The first interface unit is the same as the interface unit of the subscriber identity module
Virtual subscriber identity module.
3. The method of claim 2,
A controller for determining whether a transmission signal transmitted from the mobile terminal through the first interface unit is a signal for the subscriber identity module; And
An encryption unit for encrypting the transmission signal according to the determination result,
Further comprising a virtual subscriber identity module.
A module mounting unit on which a subscriber identification module for a mobile terminal is mounted;
A first interface for communicating with the subscriber identity module;
An information receiver for receiving a subscriber information request message transmitted from a virtual subscriber identity module installed in a subscriber identity module slot of the mobile terminal; And
And an information transmission unit for transmitting the subscriber information stored in the subscriber identity module to the virtual subscriber identity module,
The mobile terminal using the mobile communication service transmits the subscriber information to the mobile communication server using a mobile communication network for subscriber authentication and location registration, transmits and receives voice and text data to and from a user terminal provided by the user,
The virtual subscriber identity module
A wireless communication unit for receiving the subscriber information from a virtual mobile terminal equipped with the subscriber identity module physically separated from the mobile terminal using a wireless communication network; And
And a second interface unit for transmitting the subscriber information to the mobile terminal on which the virtual subscriber identity module is installed,
Virtual mobile terminal.
5. The method of claim 4,
A controller for determining whether the information request of the virtual subscriber identity module is an information request for the subscriber identity module; And
According to the determination result, the encryption unit
The virtual mobile terminal further comprising:
5. The method of claim 4,
The information receiver
Receiving a subscriber authentication and location registration result for the subscriber information from the virtual subscriber identity module,
The information transmission unit
And transmitting the subscriber authentication and location registration result to a user terminal performing VoIP communication with the mobile terminal
Virtual mobile terminal.
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KR1020160017661A 2016-02-16 2016-02-16 VIRTUAL SUBSCIBER IDENTIFICATION MODULE AND VIRTUAL MOBILE DEVICE, VoIP COMMUNICATION METHOD THEREOF KR101908293B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102143927B1 (en) * 2020-04-21 2020-08-12 김진학 Cloud server device, gateway, usim reading electronic device, and user terminal for roaming service and method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107333292B (en) 2017-07-10 2019-11-12 深圳市优克联新技术有限公司 A kind of SIM card state judging method and device

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Publication number Priority date Publication date Assignee Title
KR20040026218A (en) * 2002-09-23 2004-03-30 엘지전자 주식회사 Method for roaming service using usim
KR100777822B1 (en) * 2006-02-03 2007-11-22 에스케이 텔레콤주식회사 Method and System for Providing Wireless Data Roaming Service by Using International Roaming Mobile Identification Number

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102143927B1 (en) * 2020-04-21 2020-08-12 김진학 Cloud server device, gateway, usim reading electronic device, and user terminal for roaming service and method thereof
WO2021215599A1 (en) * 2020-04-21 2021-10-28 Kim Jin Hak Cloud server device, gateway, usim-reading electronic device, and user terminal for roaming service, and method therefor

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