KR101805637B1 - Method for Voice Over Long Term Evolution Emergency Call Connection And Single LTE Terminal Thereof - Google Patents

Method for Voice Over Long Term Evolution Emergency Call Connection And Single LTE Terminal Thereof Download PDF

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KR101805637B1
KR101805637B1 KR1020150169979A KR20150169979A KR101805637B1 KR 101805637 B1 KR101805637 B1 KR 101805637B1 KR 1020150169979 A KR1020150169979 A KR 1020150169979A KR 20150169979 A KR20150169979 A KR 20150169979A KR 101805637 B1 KR101805637 B1 KR 101805637B1
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emergency call
network
lte
information
network information
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KR1020150169979A
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Korean (ko)
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KR20170064335A (en
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조수경
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주식회사 엘지유플러스
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    • H04W76/007—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Telephone Function (AREA)

Abstract

A single LTE terminal that performs a VoLTE emergency call is started. The terminal includes a communication unit, a user input unit for inputting an emergency call connection command, a control unit for acquiring first LTE network information through a communication unit when a command is input and a USIM is not recognized, and a memory for storing second LTE network information The controller may determine the connection network by comparing the first LTE network information with the second LTE network information, and may transmit a Session Initiation Protocol (SIP) INVITE message to the determined network. Accordingly, user convenience can be improved.

Description

[0001] The present invention relates to a VoLTE emergency call connection method and a single LTE terminal for the VoLTE emergency call connection method.

The present invention relates to a VoLTE system, and more particularly, to a VoLTE emergency call connection method and a single LTE terminal for the VoLTE emergency call connection method.

Recently, a ubiquitous society based on information and communication technology is being implemented. The wired / wireless communication network is connected globally, and various needs of individuals, companies, and countries are being solved.

Generally, a mobile communication system has been developed to provide voice service while ensuring the user's activity. However, the mobile communication system is gradually expanding not only to voice but also to data service, and now it has developed to the extent of providing high-speed data service.

In today's mobile communication system, there is a need to solve the problem of lack of resources due to the provision of various services, and there is a need to develop a more advanced mobile communication system according to the demand of a user who wants to provide a higher speed service .

As a system under development in the next generation mobile communication system in response to this demand, standard works for LTE (Long Term Evolution) are underway in the 3rd Generation Partnership Project (3GPP). LTE is a technology that implements high-speed packet-based communication with transfer rates of up to 100 Mbps. For example, there are several ways to reduce the number of nodes on the communication path by simplifying the structure of the network, or to make wireless protocols as close as possible to the wireless channel.

On the other hand, in the LTE network, in order to support voice call, CSFB (CS fall (CS)), which uses IMS-based VoLTE (Voice over LTE) technology in a packet switched (PS) scheme or CS (Circuit Switched) scheme in a 2G / back technology. In LTE networks, VoLTE is a term that can be used with the same concept as VoIMS (Voice over IMS). In an LTE network, emergency calls can be serviced through VoLTE.

1 is a diagram illustrating an emergency call when a SIM card is normally loaded in a terminal. First, the user terminal 10 requests an Attach to the network 20 (S11), and receives an Attach acknowledgment from the network (S13). At this time, the P-CSCF address is also received. Then, the user terminal 10 performs a Session Initiation Protocol (SIP) registration process defined in the network 20 and a standard (S15). Then, the user terminal 10 can perform the emergency call through the network 20 (S17). Then, an emergency PDN (Packet Data Network) is set (S18). Then, the user terminal 10 transmits a SIP INVITE message to the network (S19). Then an emergency call is normally performed.

Also, if the SIM card is not installed, the user terminal supporting both WCDMA and LTE can acquire the strongest WCDMA network and then make an emergency call to the WCDMA network. Referring to FIG. 2, the user terminal 10 sends an emergency call (S21), the signal acquires the strongest WCDMA network (S23), and makes a service request to the network 20 (S25).

Recently, terminals supporting only LTE networks are emerging. Such a terminal is referred to as a single LTE terminal. A single LTE terminal can use only LTE network without using the existing WCDMA network, and it is able to deviate from the existing WCDMA.

However, when there is no SIM card in the single LTE terminal, or when the SIM card is not recognized, there is no special way to perform the emergency call. Therefore, it is urgently required to be supplemented.

Reference Standard 3GPP TS 24.301

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for a single LTE terminal to perform an emergency call without recognizing a SIM card.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

According to various embodiments of the present invention, a VoLTE emergency call connection method in a single LTE terminal includes: receiving an emergency call connection command; If the SIM card is not recognized, acquiring first LTE network information; Comparing the first LTE network information with previously stored second LTE network information to determine a connection network; And a Session Initiation Protocol (SIP) INVITE message to the determined network.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And can be understood and understood.

According to various embodiments of the present invention, a single LTE terminal that performs an emergency call without recognizing a SIM card is provided, thereby improving user convenience and device efficiency.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

1 and 2 are flowcharts showing an example of a system for performing emergency call origination in the prior art.
3 is a diagram illustrating a structure of a general LTE mobile communication system according to an embodiment.
4 is a block diagram of a single LTE terminal according to an embodiment.
5 is a flowchart illustrating a VoLTE emergency call connection method in a single LTE terminal according to an embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the description of the embodiment, in the case of being described as being formed on the "upper or lower", "before" or "after" of each component, (Lower) "and" front or rear "encompass both that the two components are in direct contact with each other or that one or more other components are disposed between the two components.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

LTE  Generalization of Mobile Communication Systems

3 is a diagram illustrating a structure of a general LTE mobile communication system according to an embodiment.

3, the radio access network of the LTE mobile communication system includes an Evolved Node B (EUTRAN) 110, a Mobility Management Entity (MME) 120, and an S-GW (Serving Gateway) 130.

A user equipment (UE) 100 accesses an external network through an ENB 110, an S-GW 130, and a P-GW (Packet Data Network Gateway) 160.

The ENB 110 corresponds to a radio network controller (RNC) of a Universal Terrestrial Radio Access Network (UTRAN) system and a base station controller (BSC) of a GSM EDGE Radio Access Network .

The ENB 110 is connected to the UE 100 through a radio channel and plays a similar role as a conventional RNC / BSC. The ENB 110 may use several cells at the same time.

In LTE, since all user traffic including a real-time service such as Voice over IP (VoIP) using an internet protocol is serviced through a shared channel, a device for collecting and scheduling situation information of UEs 100 is required This is handled by the ENB 110.

The MME 120 is an apparatus that performs various control functions, and one MME 120 can be connected to a plurality of base stations 110.

The S-GW 130 is a device that provides a data bearer and generates or removes a data bearer under the control of the MME 120. [

An application function (AF) 140 is a device that exchanges information related to a user and an application at an application level. The AF 140 may be, for example, an SCC AS (Service Centralization and Continuity Application Server) for supporting a voice service through a packet network. The SCC AS can perform a function of notifying the paging-enabled domain of a terminal through a Terminating Access Domain Selection (T-ADS).

A Policy Charging and Rules Function (PCRF) 150 is a device for controlling a policy related to a quality of service (QoS) of a user and includes a Policy and Charging Control (PCC) GW 160, and is applied. The Policy Charging and Rules Function (PCRF) 150 is an entity that collectively controls QoS and billing for traffic.

Generally, the UP refers to the UE 100 in which user data is transmitted and received, the ENB 110 as a RAN node, the ENB 110 and the S-GW 130 as RAN nodes, and the P- GW 160. In this case, A part of the path using a radio channel with a limited resource limitation is a path between the UE 100 and the ENB 110 serving as a RAN node.

In a wireless communication system such as LTE, the unit that can apply QoS is an evolved packet system (EPS) bearer. An EPS bearer is used to transmit IP flows with the same QoS requirements.

A QoS related parameter may be assigned to the EPS bearer, which includes a QoS Class Identifier (QCI) and an Allocation and Retention Priority (ARP). The QCI is a parameter defining QoS priority as an integer value, and the ARP is a parameter used to determine whether to permit or reject generation of a new EPS bearer.

The EPS bearer corresponds to a Packet Data Protocol (PDP) context of a General Packet Radio Service (GPRS) system. One EPS bearer belongs to a PDN connection, and a PDN connection can have an APN (Access Point Name) as an attribute. If a PDN connection is created for an IMS (IP Multimedia Subsystem) service such as Voice over LTE (VoLTE), the PDN connection must be created using a well-known IMS APN.

In various embodiments, the mobile communication network may be configured such that the LTE system and the legacy system coexist. That is, some network operators of the mobile communication system can install emergency call services or VoLTE-supported networks together with emergency call services or VoLTE-unsupported networks when constructing the network. More specifically, based on Voice over LTE (VoLTE), a kind of voice service, a mobile communication network allows use of an emergency call service or VoLTE service in a certain area (TA, Tracking Area) May be configured to allow Circuit Switched (CS) emergency or CS voice calls using a legacy network instead of allowing emergency call services or VoLTE services. VoLTE is a method of providing voice service using a packet switched (PS) network and an IMS network.

Here, the availability of the emergency call service or VoLTE may be different depending on the network configuration area, for example, the cell or the base station in a small unit, and the larger unit may be different depending on the TA (Tracking Area) or the MME pool area .

The core network node, in particular, the MME, identifies that an emergency call service is available or an IMS-based voice service when the user terminal performs location registration (attach or TAU (Tracking Area Update)) process in the emergency call service or VoLTE support area And provides the terminal with an identifier that it is available. On the contrary, when the UE performs location registration in the emergency call service or VoLTE unsupported area, the core network node provides the UE with an identifier indicating that the UE is unavailable or an identifier indicating that the IMS-based voice service is unavailable. In this network configuration, when an actual user terminal moves between two areas, the domain providing the voice service (PS for VoLTE and CS for the remaining area) can be changed. In the case of a terminal registered in the IMS, the I-CSCF / S-CSCF requests to the T-ADS in which domain (PS or CS) to perform paging for a voice call in a procedure of processing a voice call request to the terminal do. CSCF / S-CSCF informs the I-CSCF / S-CSCF of the domain for processing the voice call by referring to the result obtained from the entities of the network by the T-ADS, . ≪ / RTI >

In case that the emergency call service or VoLTE crosses two areas in the state where the user has a currently activated voice call, the emergency call service or VoLTE service is performed for the voice call currently in progress for the voice call user's experience. It can be continued. Accordingly, the user terminal can maintain the ongoing emergency call or VoLTE voice call even if it moves to the emergency call or VoLTE non-allowed area after starting the emergency call or VoLTE voice call in the emergency call or VoLTE allowable area.

According to the above-described method, when a voice call is being performed through an emergency call or VoLTE in an emergency call or VoLTE non-allowed area, if another user makes a call to the terminal performing the voice call, the MSC / A request is received by the Mobile Switching Center / Visitor Location Register (VLR). Upon receiving the request, the MSC / VLR sends a CS paging request to the MME. At this time, the UE is in an EMM-CONNECTED mode because it is performing a voice call via an emergency call or VoLTE, and accordingly the MME sends a CS SERVICE NOTIFICATION message to the UE to send voice call paging through the CS domain. In this case, the terminal performs CSFB for processing voice call paging and moves the voice call through the emergency call or VoLTE to a network other than the one using the call, and as a result, the emergency call may be interrupted.

Therefore, in this case, there is a need for a method for continuously receiving voice service for an emergency call.

4 is a block diagram of a single LTE terminal to which the present invention is applied according to an embodiment.

Referring to FIG. 4, the single LTE terminal 100 is a terminal that can use only the LTE network.

The single LTE terminal 100 may include a user input unit 210, a communication unit 220, a memory 230, and a control unit 240. Although not described herein, the single LTE terminal 100 may include all of the components of the mobile terminal.

Here, the single LTE terminal 100 may be a cellular phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), navigation, A tablet PC, an ultrabook, a wearable device such as a smartwatch, a smart glass, and a head mounted display (HMD). have.

The user input unit 210 receives an emergency call connection command.

The user input unit 210 receives an emergency call connection command through a button, a user touch input, or the like. When an emergency call (e.g., 119) connection command is input, the terminal 100 attempts to establish an emergency call connection.

The communication unit 220 can communicate with the eNode 110. The communication unit 220 may include not only an LTE mobile communication module but also a module for performing communication such as Wi-Fi, Bluetooth, and NFC (Near Field Communication).

The memory 230 may store network information. Here, the network information includes information to be stored in a general SIM card. For example, the memory 230 may include network network information (e.g., PLMN information) connected to the AT 100 under the control of the controller 240.

The memory 230 may be a flash memory type, a hard disk type, a solid state disk type, an SDD type (Silicon Disk Drive type), a multimedia card micro type ), Card type memory (e.g., SD or XD memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read memory, a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and / or an optical disk. The terminal 100 may operate in association with a web storage that performs a storage function of the memory 230 on the Internet.

The control unit 240 is a module for controlling the components of the terminal 100 as a whole, and the control unit 240 can perform an emergency call connection. Specifically, when the emergency call connection command is input through the user input unit 210, the control unit 240 can recognize the SIM card.

When the SIM card is normally recognized, the control unit 240 can perform an Attach operation and a Session Initiated Protocol (SIP) registration operation with the network 110 normally. Here, the SIM card may be a UICC (Universal Integrated Circuit Card).

However, if there is no SIM card or the SIM card is not normally recognized, the control unit 240 performs the emergency Attach operation and receives the first LTE network information from the network 110. [ The first LTE network information may include PLMN (Public Land Mobile Network) information.

The controller 240 compares the second LTE network information stored in the memory 230 with the first LTE network information to determine a network to be connected.

If the first network information is different from the second LTE network information stored in the memory 230, the control unit 240 can repeatedly perform the network search until receiving the LTE network information corresponding to the second LTE network information have.

The control unit 240 transmits the SIP INVITE message to the determined network. The source of the SIP INVITE message may be set as Anonymous and the SIP INVITE message may be transmitted.

Hereinafter, a VoLTE emergency call connection method in a single LTE terminal will be described with reference to FIG. The single LTE terminal 100 can not recognize the SIM card (there is no SIM card or the SIM card is not recognized).

First, the single LTE terminal 100 transmits an emergency call (S33).

The single LTE terminal 100 receives an emergency call destination (for example, 119, 112, etc.) through the user input unit 210 and performs an emergency call transmission when the call button is selected.

The control unit 240 receives one LTE network information because the SIM card is not recognized (S35). LTE network information means SIB1 (System Information Block 1), and SIB1 includes PLMN (Public Land Mobile Network) information.

The controller 240 compares the hard-coded LTE network information with the received LTE network information in the memory 230 (S37). Although the LTE network information is hard-coded in the memory 230 in the present specification, the memory 230 may be disposed outside the terminal 100.

If the LTE network information is inconsistent, the control unit 240 can continuously receive the LTE network information matching the hard-coded LTE network information (S39).

If the control unit 240 determines that the LTE network information matches, the control unit 240 determines that the LTE network is a connected network (S41).

Then, the single LTE terminal 100 performs an emergency attachment with the network 20 (S43). Here, the network may correspond to the Node B. The control unit 240 transmits the SIP INVITE message to the determined connection network 20 (S45). In particular, the SIP INVITE message can be transmitted by setting the source information to Anonymous.

At this time, the control unit 240 does not perform the SIP registration process with the determined connection network.

Meanwhile, the Node B that communicates with the single LTE terminal 100 may include a communication unit and a control unit. The Node B can transmit SIB 1 information to the single LTE terminal 100. In addition, the Node B can perform an emergency attachment with the single LTE terminal 100.

The Node B can store the terminal information normally loaded with the USIM and register the terminal information in the core network.

The method according to the above embodiments may be embodied as a program to be executed in a computer, and the program may be stored in a computer-readable recording medium. Examples of the computer- CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like.

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

100: Single LTE terminal
210: user input
220:
230: Memory
240:
110: eNode

Claims (30)

1. A VoLTE emergency call connection method in a single LTE terminal,
Receiving an emergency call connection command;
Determining whether a sim card is recognized;
If the SIM card is not recognized, acquiring first LTE network information;
Comparing the first LTE network information with previously stored second LTE network information to determine a connection network; And
Transmitting a Session Initiation Protocol (SIP) INVITE message to a determined network; and connecting a VoLTE emergency call connection in a single LTE terminal. The method according to claim 1,
The step of acquiring the first LTE network information comprises:
A VoLTE emergency call connection method in a single LTE terminal that receives SIB1 (System Information Block 1) information from a base station. 3. The method of claim 2,
Wherein the SIB1 information includes Public Land Mobile Network (PLMN) information. The method according to claim 1,
The step of acquiring the first LTE network information comprises:
And performing Emergency Attach to the VoLTE emergency call connection method. The method according to claim 1,
And the second LTE network information is stored in the terminal instead of the SIM card. The method according to claim 1,
Wherein the step of determining the connection network comprises:
And acquiring LTE network information until LTE network information matching the second LTE network information is retrieved if the first LTE network information and the previously stored second LTE network information are different from each other, How to connect VoLTE emergency call from LTE terminal. The method according to claim 1,
The method does not perform the SIP registration process with the determined network, and a VoLTE emergency call connection method in a single LTE terminal. The method according to claim 1,
Wherein the transmitting the SIP INVITE message to the determined network comprises:
And setting the source to Anonymous to transmit the SIP INVITE message to the determined network. The method according to claim 1,
The step of receiving the emergency call connection command comprises:
And receiving the emergency call connection command by a user's touch, the VoLTE emergency call connection method in a single LTE terminal. In a single LTE terminal that performs a VoLTE emergency call,
A communication unit;
A user input unit for inputting an emergency call connection command;
A controller for receiving the command and determining whether a USIM is recognized and acquiring first LTE network information through the communication unit when the USIM is not recognized; And
And a memory for storing second LTE network information,
Wherein,
Comparing the first LTE network information with the second LTE network information to determine a connection network,
SIP (Session Initiation Protocol) A single LTE terminal that performs a VoLTE emergency call, sending an INVITE message to the determined network. 11. The method of claim 10,
Wherein,
A single LTE terminal for performing a VoLTE emergency call to receive SIB1 (System Information Block 1) information from a base station through the communication unit. 12. The method of claim 11,
Wherein the SIB1 information includes PLMN (Public Land Mobile Network) information, the single LTE terminal performing a VoLTE emergency call. 11. The method of claim 10,
Wherein,
A single LTE terminal for performing a VoLTE emergency call to perform emergency attachment with a network entity providing the first LTE network information; 11. The method of claim 10,
Wherein the second LTE network information is stored in the memory rather than being stored in the USIM. 11. The method of claim 10,
Wherein,
Wherein the LTE network information is acquired until the LTE network information corresponding to the second LTE network information is retrieved when the first LTE network information and the previously stored second LTE network information are different from each other, LTE terminal. 11. The method of claim 10,
Wherein,
A single LTE terminal that performs a VoLTE emergency call without performing the SIP registration process with the determined network. 11. The method of claim 10,
Wherein,
And sending the SIP INVITE message to the determined network by setting the source as Anonymous, and performing a VoLTE emergency call. 11. The method of claim 10,
Wherein,
A single LTE terminal for performing a VoLTE emergency call in which an emergency call is attempted when a user's touch is input through the user input unit. A program recorded on a recording medium for realizing a VoLTE emergency call connection method in the single LTE terminal according to claim 1. A recording medium on which the program according to claim 19 is recorded. CLAIMS 1. A method of operating a network equipment for servicing a VoLTE emergency call,
Transmitting first network information to a single LTE terminal that has transmitted an emergency call;
Setting a single LTE terminal and an emergency attach;
And receiving a Session Initiation Protocol (SIP) INVITE message from the single LTE terminal,
Wherein the single LTE mobile station determines whether a SIM card is recognized and determines a connection network using the first network information if the SIM card is not recognized. 22. The method of claim 21,
The step of transmitting the first network information to the terminal comprises:
And transmits SIB1 (System Information Block 1) information including PLMN information to the single LTE terminal. 22. The method of claim 21,
Wherein the network equipment does not perform the SIP registration process with the single LTE terminal, and provides a VoLTE emergency call service. 22. The method of claim 21,
The receiving the SIP INVITE message comprises:
And receiving the SIP INVITE message from the single LTE terminal whose source is set to Anonymous. 22. The method of claim 21,
And registering the single LTE terminal in which the SIM card is recognized in the core network. A network equipment for servicing a VoLTE emergency call,
A communication unit for transmitting first network information to a single LTE terminal that has transmitted an emergency call; And
And a controller for performing an emergency attach with the single LTE terminal and receiving a Session Initiation Protocol (SIP) INVITE message from the single LTE terminal through the communication unit,
Wherein the single LTE terminal determines whether a SIM card is recognized and determines a connection network using the first network information if the SIM card is not recognized. 27. The method of claim 26,
Wherein,
And transmits SIB1 (System Information Block 1) information including PLMN information to the single LTE terminal through the communication unit. 27. The method of claim 26,
Wherein,
And a VoLTE emergency call service that does not perform the SIP registration process with the single LTE terminal. 27. The method of claim 26,
Wherein,
And receives the SIP INVITE message whose source is set to Anonymous via the communication unit from the single LTE terminal. 27. The method of claim 26,
Wherein,
And registers the single LTE terminal in which the SIM card is recognized in the core network.
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