KR101497243B1 - VoLTE Receipt Service Providing System, Home Subscriber Server, Application Server and VoLTE Receipt Service Providing Method for Single LTE Subscriber - Google Patents

Abstract

Disclosed are a VoLTE receipt service providing system, a home subscriber server, an application server, and a VoLTE receipt service providing method for a single LTE subscriber. The VoLTE receipt service providing system according to the present invention includes: a call connection support entity which supports a call connection for the single LTE subscriber; and the home subscriber server which manages a state according to the call connection support entity, and induces the single LTE subscriber to re-register in another call connection support entity through a mobility management device corresponding to the location of the single LTE subscriber if an obstacle occurs on the call connection support entity corresponding to the single LTE subscriber.

Description

[0001] The present invention relates to a VoLTE call termination service providing system for a single LTE subscriber, a home subscriber server, an application server, and a method for providing the VoLTE termination service to a single LTE subscriber.

The present invention relates to a VoLTE call termination service providing system for a single LTE subscriber, a home subscriber server, an application server, and a method for providing the VoLTE call termination service. More particularly, A home subscriber server, an application server, and a method for providing the VoLTE incoming call service to a single LTE subscriber, which can normally provide voice incoming to the incoming subscriber even when the VoDTE incoming call is generated.

Currently, the 3GPP (3 ^rd Generation Partnership Project) is being proposed as a new standard for multimedia production, transmission and playback through high-speed wireless networks. The Internet Protocol Multimedia Subsystem (IMS) proposed in the 3GPP standard is a system for providing IP-based multimedia services.

The IMS service refers to providing various types of packet services based on a lower IP transmission protocol to a mobile communication subscriber at the same time. The IMS service can simultaneously provide various types of packet-based services based on the IP transmission protocol to the mobile communication subscriber. The IMS service enables a mobile communication subscriber to receive not only real-time services such as voice and video but also file transmission, Real-time services such as short messages, etc., or to use new services using such services.

In order for the mobile communication subscriber to receive the IMS service, a registration process must be performed. In this registration process, a call control function for controlling the call and the service of the mobile communication terminal of the mobile communication subscriber must be allocated.

In order to provide such IMS service, an important function element of the subsystem in the IMS core network is a call session control function (CSCF) and a home subscriber server (HSS).

The CSCF is a device that handles registration and multimedia call processing functions using SIP (Session Initiation Protocol), and includes a Proxy-Call Session Control Function (P-CSCF), a Query / CSCF (Interrogate-Call Session Control Function), and Serving-Call Session Control Function (S-CSCF).

The P-CSCF is the point where the mobile communication subscriber first accesses the network. The P-CSCF relays the SIP registration request message of the mobile communication subscriber to the I-CSCF with reference to the home domain of the subscriber, and maintains the security relationship with the mobile communication subscriber.

The I-CSCF obtains the address of the S-CSCF performing the SIP registration of the mobile communication subscriber from the HSS and allocates the S-CSCF to be responsible for the actual registration of the mobile communication subscriber.

The S-CSCF downloads the subscription information of the mobile communication subscriber from the HSS and stores it, and provides the corresponding service to the mobile communication subscriber.

The HSS performs a role of a master database of a mobile communication subscriber and is a kind of database integrated with functions of a home location register (HLR) and a function for mobility management and authentication of an IP multimedia subscriber.

For IMS call processing, the S-CSCF must register with the mobile communication subscriber's IP and ID, e.g., a telephone number, login ID, and the like. At this time, the I-CSCF queries the HSS to determine which S-CSCF should be registered. The overall call process including this process will be briefly described below.

First, when the P-CSCF receiving the request from the mobile communication subscriber requests the registration to the I-CSCF, the I-CSCF makes an S-CSCF search request to the HSS to find the S-CSCF to be registered.

The HSS determines whether there is an existing S-CSCF registered. If there is an existing S-CSCF registered, the HSS responds the corresponding S-CSCF information to the I-CSCF for re-registration. Otherwise, the I- -CSCF will tell you to judge on your own.

If the HSS informs the S-CSCF information, the I-CSCF sends a registration request message to the corresponding S-CSCF, and the S-CSCF, which has received the registration request message, sends a status message indicating that the mobile communication subscriber is registered To the HSS.

On the other hand, if the HSS transmits a registration status response message to the corresponding S-CSCF, it is possible to control the IMS call processing service for the corresponding S-CSCF.

Meanwhile, there is a CSCF for controlling a call to control a VoLTE (Voice Over LTE) service, which is an IMS-based voice call in an LTE (Long Term Evolution) network. When a VoLTE incoming call occurs for a single LTE user, And transmits the IP address information of the corresponding CSCF to the originating equipment so as to connect the call to the CSCF controlling the VoLTE of the single LTE subscriber. However, when a failure or an overload occurs in the CSCF, a VoLTE incoming call for the corresponding single LTE subscriber can not be normally processed.

1, a user equipment (UE) is a mobile communication terminal used by a subscriber of a mobile communication terminal, and a user equipment (UE) The Evolved Node B (eNB) is a device that provides a wireless connection between the UE and the LTE network as a base station. The MME (Mobility Management Entity) is a kind of switching device that authenticates the UE and manages the EPS bearer And manages the mobility state of the subscriber. In particular, the PDW Gateway (PGW) is a device that assigns an IP address to a terminal and performs a function of allowing each UE to connect to an IP-based communication network such as an IP Multimedia Subsystem (IMS) network or the Internet.

That is, in order for the communication terminal to connect to the IMS network or the Internet network, or to receive a signal from the IMS network or the Internet network, the PGW must operate normally. However, conventionally, when a malfunction occurs in the PGW, .

2 and 3 show an example of a procedure in which a call is connected between VoLTE terminals. FIG. 2 shows an example of a case where the PGW on the receiving terminal side operates normally. FIG. Is generated. Although SGW (Serving Gateway) may be additionally included in the figure, it is omitted for convenience of explanation.

2, when a calling terminal acquiring a communication channel through communication with the MME transmits an INVITE message corresponding to a call connection signal to a calling CSCF (Call State Control Function) via a PGW, the calling CSCF transmits an HSS (LIR signal) of the called terminal to the CSCF, and if the HSS transmits the location information (LIA signal) of the called terminal to the CSCF, the CSCF transmits an INVITE message to the called CSCF based on the location information of the called terminal do.

At this time, the called CSCF transmits an INVITE message to the called terminal via the called party PGW. Thereafter, a call channel is formed between the calling terminal and the called terminal according to the response of the called terminal, and the caller and the called party can communicate with each other do.

The process of connecting a call between VoLTE terminals and forming a call channel corresponds to a known technique and thus has been described briefly. The important point here is that the INVITE message of the calling party is transmitted to the called terminal via the called party PGW .

However, in the case where a malfunction has occurred in the called PGW, there is no conventional technique for confirming this in advance. Therefore, as shown in FIG. 3, only when the incoming CSCF sends the INVITE message to the called terminal via the called PGW, I could find a problem that the message was not sent properly.

That is, since the functional failure state of the called party PGW could not be confirmed in advance, the signal transmission process from the calling party CSCF to the called party PGW was carried out meaninglessly.

This results in a delay in the call connection or a decrease in the call connection success rate, which in turn causes complaints from the subscribers.

In the above description, both the CSCF and the PGW are devices that support a function for making a call connection with a called party, and they are collectively referred to as a call connection supporting entity. Even if a call connection supporting entity fails, There has been a demand for a technique for quickly establishing a call connection to a receiving terminal.

Japanese Patent Application Laid-Open No. 10-2008-0066515 (Published Date: 2008. 07. 16)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a VoLTE incoming call service capable of normally providing a voice call reception to a call receiving subscriber even when a failure occurs in a call connection supporting entity supporting call connection of the called subscriber System, a home subscriber server, an application server, and a VoLTE incoming call service providing method.

According to an aspect of the present invention, there is provided a home subscriber server comprising: a failure occurrence determination unit for determining whether a failure occurs in a call control function device corresponding to a single LTE subscriber when a VoLTE incoming call occurs in a single LTE subscriber; ; And a re-registration inducing unit for re-registering the position of the single LTE subscriber through the mobility management apparatus corresponding to the location of the single LTE subscriber when it is determined by the failure occurrence determination unit that a failure has occurred in the call control function apparatus, And a VoLTE incoming call is provided to the single LTE subscriber through the call control function device whose position is re-registered by the induction of the re-registration inducement unit.

The home subscriber server may further include a state manager for periodically transmitting and receiving a state management message for each call control function device and managing states of each state based on a transmitted and received state management message. In this case, the failure occurrence determination unit determines whether a failure of the call control function device corresponding to the single LTE subscriber has occurred based on the state management message transmitted / received by the state management unit.

According to another aspect of the present invention, there is provided a system for providing a VoLTE reception service, the system including: a call connection supporting entity supporting a call connection to the single LTE subscriber; And managing a state for each of the call connection supporting entities, wherein when a failure occurs in a call connection supporting entity corresponding to the single LTE subscriber, the single LTE subscriber transmits a different call through the mobility management apparatus corresponding to the position of the single LTE subscriber, And a home subscriber server for inducing the connection support entity to re-register.

In the above-described VoLTE reception service providing system, the call connection supporting entity includes a call control function device for performing location registration and multimedia call processing functions for the single LTE subscriber by using SIP (Session Initiation Protocol), and a single LTE subscriber And a PGT (Pact Data Network Gateway) for connecting to the IMS network.

In order to achieve the above object, a home subscriber server according to an embodiment of the present invention, when a VoLTE incoming call occurs in a single LTE subscriber, determines whether or not a failure occurs in a call connection supporting entity corresponding to the single LTE subscriber part; And a re-registration inducing unit for re-registering the single LTE subscriber through the mobility management apparatus corresponding to the position of the single LTE subscriber when the failure occurrence determining unit determines that a failure has occurred in the call connection supporting entity. And a VoLTE incoming call is provided to the single LTE subscriber through a call connection supporting entity whose location is re-registered by induction of the re-registration inducement unit.

In the above-described home subscriber server, the call connection supporting entity is a call control function device that performs a location registration and a multimedia call processing function for the single LTE subscriber by using a Session Initiation Protocol (SIP).

The home subscriber server may further include a state manager for periodically transmitting and receiving a state management message for each call control function device and managing states of each state based on a state management message transmitted and received. In this case, the failure occurrence determination unit determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs based on the status management message transmitted / received by the status management unit.

The home subscriber server may further include a monitoring information input unit for receiving performance monitoring information for each call control function device from the LTE network manager. In this case, the failure occurrence determination unit determines whether a failure occurs in the call control function device corresponding to the single LTE subscriber based on the performance monitoring information input through the monitoring information input unit.

The home subscriber server may further include a receiver determining unit that determines whether a receiver corresponding to the VoLTE incoming call is the single LTE subscriber. In this case, when the called party determination unit determines that the called party is the single LTE subscriber, the failure occurrence determination unit determines whether a failure of the call control function device corresponding to the corresponding single LTE subscriber occurs.

The home subscriber server may further include a roaming determining unit that determines whether the called LTE subscriber is roaming if the called party determining unit determines that the called party is the single LTE subscriber. In this case, when the single LTE subscriber is located in Korea, the failure occurrence determination unit determines whether or not a failure of the call control function device corresponding to the single LTE subscriber occurs by the roaming determination unit.

The home subscriber server may further include a message receiver for receiving a Short Message Relay (SMR) message from the message application server, the information including information on whether or not the call control device has failed. In this case, when the single LTE subscriber relocates through another call control function device based on the SMR message received through the message receiver, the single LTE subscriber is notified of the SOI SMS over IMS) service.

According to another aspect of the present invention, there is provided a home subscriber server comprising: a receiver for receiving a request signal for a call connection with a called terminal according to a request from an originating terminal; A determination unit for determining whether a packet data network gateway (PGW) matching the destination terminal has failed according to a request signal for call connection received by the reception unit; And a transmission unit for transmitting a reconnection request signal for a new PGW connection to the destination terminal when a failure occurs in the PGW matched to the destination terminal as a result of the determination by the determination unit.

According to an aspect of the present invention, there is provided an application server for providing an SOI (SMS over IMS) service to a single LTE subscriber according to an embodiment of the present invention includes a monitoring information input unit for receiving performance monitoring information for each call control function device; A flag setting unit for setting a failure flag of a call connection supporting entity corresponding to each performance monitoring information inputted when the performance monitoring information is input through the monitoring information input unit; A flag retrieval unit for retrieving a failure flag of a call connection supporting entity corresponding to the single LTE subscriber when a character incoming call is requested to the single LTE subscriber; And a message transmission unit for transmitting an SMR message including information on the call connection supporting entity to the home subscriber server when the call connection supporting entity corresponding to the single LTE subscriber is determined as a failure by the flag searching unit And the single LTE subscriber provides the SOI service to the single LTE subscriber through the call connection supporting entity re-registered with the location by the control of the home subscriber server.

According to another aspect of the present invention, there is provided a method for providing a VoLTE reception service performed by a home subscriber server, the method comprising: when a VoLTE incoming call occurs in a single LTE subscriber, Determining whether a fault has occurred; And inducing re-registration of the single LTE subscriber through the mobility management apparatus corresponding to the position of the single LTE subscriber when it is determined by the failure occurrence determination step that a failure has occurred in the call connection supporting entity And a VoLTE incoming call is provided to the single LTE subscriber through a call connection supporting entity whose location is re-registered by the location re-registration inducing step.

In the above-described VoLTE reception service providing method, the call connection supporting entity is a call control function device that performs location registration and multimedia call processing function for the single LTE subscriber by using SIP (Session Initiation Protocol).

The VoLTE reception service providing method may further include transmitting and receiving a status management message periodically for each call control function device and managing each status based on a status management message transmitted and received. In this case, the failure occurrence determination step determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs based on the status management message transmitted / received by the status management step.

The method for providing a VoLTE reception service further includes receiving performance monitoring information for each call control function device from an LTE network manager. In this case, the failure occurrence determination step determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs based on the performance monitoring information input through the performance monitoring information input step.

The method of providing VoLTE call termination service may further include determining whether a called party corresponding to a VoLTE incoming call is the single LTE subscriber. In this case, when it is determined by the called party determination step that the called party is the single LTE subscriber, the failure determination step determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs.

The method further includes determining whether the single LTE subscriber is roamed when it is determined by the called party determination step that the called party is the single LTE subscriber. In this case, when the single LTE subscriber is located in the home country, it is determined whether or not a failure of the call control function device corresponding to the single LTE subscriber occurs by the roaming determination step.

The method for providing a VoLTE call termination service may further include receiving a Short Message Relay (SMR) message including a failure occurrence information of a call control function device from a message application server. In this case, when the single LTE subscriber performs location re-registration through another call control function device based on the SMR message received through the message receiving step, the single LTE subscriber So that an SOI (SMS over IMS) service is provided.

According to another aspect of the present invention, there is provided a method of controlling a home subscriber server, the method comprising the steps of: when a request signal for a call connection with a called terminal is received according to a request of a calling terminal, Determining whether a packet data network gateway (PGW) has failed; And transmitting a reconnection request signal for a new PGW connection to the destination terminal when a failure occurs in the PGW matched to the destination terminal as a result of the determination.

According to another aspect of the present invention, there is provided a method for providing a VoLTE reception service performed by an application server, the method comprising: receiving performance monitoring information for each call control function device; Setting a failure flag of a call connection supporting entity corresponding to each performance monitoring information inputted when the performance monitoring information is inputted through the performance monitoring information inputting step; Searching for a failure flag of a call connection supporting entity corresponding to the single LTE subscriber if a character incoming request for the single LTE subscriber is requested; And transmitting an SMR message including information on a call connection supporting entity to a home subscriber server when the call connection supporting entity corresponding to the single LTE subscriber is determined as a failure by the flag searching step. Wherein the single LTE subscriber provides the SOI service to the single LTE subscriber through a call connection supporting entity re-registered with the location by the control of the home subscriber server.

According to the present invention, when providing a VoLTE incoming call service to a single LTE subscriber, even when a failure occurs in the CSCF controlling VoLTE, VoLTE incoming call service can be normally provided to the single LTE subscriber.

In addition, even when a failure occurs in the PGW in which the called terminal has established a session, it is possible to normally establish a call between the calling terminal and the called terminal by inducing the called terminal to form a session with a new PGW.

1 is a schematic configuration diagram of a conventional LTE communication network,
2 is a diagram illustrating a process in which a call connection and a call connection between a VoLTE originating terminal and a VoLTE terminating terminal are normally performed,
FIG. 3 is a diagram illustrating a process in which a call connection process is performed when a failure occurs in a PGW matched to a call destination in the related art,
4 is a diagram schematically illustrating a VoLTE reception service providing system according to a first embodiment of the present invention.
5 is a diagram schematically showing a configuration of a home subscriber server according to a first embodiment of the present invention.
6 is a diagram schematically showing a configuration of an application server according to the first embodiment of the present invention.
FIG. 7 is a flowchart illustrating a VoLTE reception service providing method according to the first embodiment of the present invention.
8 is another example of a VoLTE reception service providing method according to the first embodiment of the present invention.
9 is yet another example of a VoLTE reception service providing method according to the first embodiment of the present invention.
10 is a schematic configuration diagram of an LTE communication network including an HSS and a called terminal according to a second embodiment of the present invention.
11 is a functional block diagram of the HSS of FIG.
12 is a diagram illustrating signals and control procedures between an HSS and an apparatus included in an LTE communication network and a receiver terminal according to a second embodiment of the present invention.
FIG. 13 is a flowchart illustrating a call connection process between the calling terminal and the called terminal according to the second embodiment of the present invention, which is compared with FIG.

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

Hereinafter, embodiments of the present invention will be described in order to facilitate understanding of the present invention, and the present invention is not limited to these embodiments. In particular, the present invention can be configured by combining at least any one of individual components, individual functions, or individual steps included in each embodiment.

Hereinafter, embodiments of the present invention will be described separately in the case where a failure occurs in a call control function device and a packet data gateway (PGW) included in a call connection support device, And PGW are interchangeable. That is, the call control function device can be replaced with the PGW function in the embodiment that describes the malfunction of the call control function device, and the PGW can be replaced with the call control function device in the embodiment that describes the PGW malfunction .

4 is a diagram schematically illustrating a VoLTE reception service providing system according to a first embodiment of the present invention.

4, a VoLTE reception service providing system according to the first embodiment of the present invention includes a plurality of call control function devices 10, a single LTE subscriber 20, a mobility management device 30, an application server 40 And a home subscriber server 100.

The call control function device 10 is a system for providing a VoLTE call termination service that provides a VoLTE call termination service which is a voice call based on an IMS (IP Multimedia Subsystem) to a single LTE subscriber 20, and uses a Session Initiation Protocol (SIP) (CSCF) device responsible for location registration and multimedia call processing for the mobile terminal 20. The configuration and functions of the CSCF in the VoLTE reception service providing system according to the present embodiment are the same as those of the general CSCF, and thus a detailed description thereof will be omitted here.

A single LTE subscriber 20 refers to a subscriber terminal subscribed to a single LTE service. Here, the single LTE is a communication service that provides a VoLTE service using only the LTE network, while the hybrid LTE provides a VoLTE service using both the 3G network and the LTE network. For a description thereof, refer to known single LTE technology.

The mobility management apparatus 30 may be implemented as an MME (Mobility Management Entity) of the LTE network and manages the mobility of the single LTE subscriber 20. The application server 40 includes a Messaging Gateway-Application Server (MSG-AS) that provides an application for an SOI (SMS over IMS) service to a single LTE subscriber 20, such as an SMS (Short Message Service) server, . ≪ / RTI >

The home subscriber server 100 is an HSS (Home Subscriber Server) that acts as a master database of a mobile communication subscriber and manages the state for each call control function device 10 and is connected to a single LTE subscriber 20 The single LTE subscriber 20 is connected to the other call control function device 10 via the mobility management device 30 corresponding to the location of the single LTE subscriber 20 when a failure occurs in the corresponding call control function device 10. [ Registration of location.

Accordingly, when the failure occurs in the call control function device 10, the single LTE subscriber 20 can access the other call control function device 10 and re-register the position thereof, so that the VoLTE service can be stably received.

5 is a diagram schematically showing a configuration of a home subscriber server according to the present embodiment. Here, the home subscriber server can be implemented in the HSS 100 of the VoLTE incoming call service providing system shown in FIG. 4 and will be described by giving the same reference numerals.

4 and 5, a home subscriber server 100 according to the present embodiment includes a failure occurrence determination unit 110, a re-registration inducement unit 120, a state management unit 130, a monitoring information input unit 140, A determination unit 150, a roaming determination unit 160, and a message reception unit 170. [

The failure occurrence determination unit 110 determines whether a failure occurs in the call control function device 10 corresponding to the single LTE subscriber 20 when a VoLTE incoming call is generated to the single LTE subscriber 20. That is, the VoLTE reception service providing system according to the present embodiment can provide a VoLTE reception service not only to the single LTE subscriber 20 but also to the hybrid LTE subscriber. The failure occurrence determination unit 110 determines whether or not the single LTE subscriber 20 (P-CSCF: Proxy-Call Session Initiation Protocol (P-CSCF)) for forwarding the SIP registration request message of the corresponding single LTE subscriber 20 to the I-CSCF with reference to the home domain of the subscriber, CSCF that performs registration of the SIP of the VoLTE subscriber 20 from the HSS and allocates the S-CSCF responsible for the actual registration of the VoLTE subscriber 20 (I-CSCF: Interrogate-Call Session Control Function) or VoLTE subscriber 20 from the HSS 100 and provides the corresponding service to the mobile communication subscriber -CSCF: Servi ng-Call Session Control Function) is overloaded or a network failure occurs. At this time, the failure occurrence determination unit 110 can determine whether or not a failure occurs in the call control function device 10 in the same manner with respect to the hybrid LTE subscriber. However, the description of the hybrid LTE subscriber is not limited to the description And the description thereof will be omitted below.

The re-registration inducement unit 120 judges that a failure has occurred in the call control function device 10 by the failure occurrence determination unit 110 through the mobility management device 30 corresponding to the location of the single LTE subscriber 20 Thereby re-registering the location of the single LTE subscriber 20. Here, the mobility management apparatus 30 may be implemented as an MME (Mobility Management Entity). In this case, the re-registration inducement unit 120 transmits a CLR (Clear) message to the mobility management apparatus 30 to delete information on the single LTE subscriber 20 stored in the mobility management apparatus 30, The device 30 may delete the pre-stored information for the single LTE subscriber 20 and induce the single LTE subscriber 20 to re-register the location with another call control function device 10. [ Accordingly, the home subscriber server 100 according to the present embodiment provides a VoLTE call termination service to the single LTE subscriber 20 through the call control function device 10 whose position is re-registered by the re-registration inducement unit 120 .

The state management unit 130 periodically transmits and receives a state management message for each call control function device 10 and manages the state of each call control function device 10 based on the state management message transmitted and received. For example, the state management unit 130 may transmit a status inquiry message to each call control function device 10 at a predetermined cycle, and may receive a response message within a set time period from each call control function device 10 have. In this case, the failure occurrence determining unit 110 determines whether a failure of the call control function device 10 corresponding to the single LTE subscriber 20 occurs based on the status management message transmitted / received by the status management unit 130. [ For example, if a response signal is not received from the call control function device 10 within a predetermined time corresponding to the status inquiry message transmitted to each call control function device 10 by the state management unit 130, The determination unit 110 may determine that a network failure has occurred in the call control function device 10. [

The monitoring information input unit 140 receives performance monitoring information for each call control function device 10 from the LTE network manager. That is, the LTE network manager monitors the status of each call control function device 10 in real time. If an overload occurs in a specific call control function device 10 or a failure occurs in the network, 140 can receive performance monitoring information for the call control function device 10 from the LTE network administrator terminal. In this case, the failure occurrence determination unit 110 determines whether a failure has occurred in the call control function device 10 corresponding to the single LTE subscriber 20 based on the performance monitoring information input through the monitoring information input unit 140 . That is, the failure occurrence determination unit 110 determines whether the call control function device 10 corresponding to the single LTE subscriber 20 corresponds to the call control function device input as a failure through the monitoring information input unit 140, It is possible to determine whether a failure has occurred in the call control function device 10 corresponding to the LTE subscriber 20.

The called party determination unit 150 determines whether the called party corresponding to the VoLTE incoming call is a single LTE subscriber. That is, the called party determination unit 150 determines whether the called party corresponding to the VoLTE incoming call is a subscriber of the communication service providing the single LTE service. In this case, when the called party determination unit 150 determines that the called party corresponding to the VoLTE incoming call is a single LTE subscriber, the failure occurrence determination unit 110 determines that the called party is the single LTE subscriber 20, It is possible to judge whether or not the system 10 has failed.

If the called party determination unit 150 determines that the called party is a single LTE subscriber, the roaming status determination unit 160 determines whether the corresponding single LTE subscriber 20 is roaming. That is, if the called party determining unit 150 determines that the called party is a single LTE subscriber, the roaming determining unit 160 determines whether the corresponding single LTE subscriber 20 is in the home country or roaming overseas. In this case, when the roaming determining unit 160 determines that the single LTE subscriber 20 is not roaming, that is, if it is determined that the single LTE subscriber 20 is located in the home, the failure occurrence determining unit 110 determines that the single LTE subscriber 20 It is possible to determine whether or not a failure of the call function control apparatus 10 has occurred. Here, when the CS (Circuit Switched) location registration of WCDMA (Wideband Code Division Multiple Access) occurs to the single LTE subscriber 20, the roaming determining unit 160 determines that the corresponding single LTE subscriber 20 It can be determined that the mobile terminal is roaming. In this case, the home subscriber server 100 performs an incoming call processing according to foreign roaming to the single LTE subscriber 20, and the process of processing the roaming incoming call is beyond the scope of the present invention. do. In the case where the single LTE subscriber 20 returns from the overseas roaming state to the home country, the roaming determining unit 160 determines that the single LTE subscriber 20 is in the single LTE subscribers 20 at the time of re- It is possible to know whether the single LTE subscriber 20 is roaming or not by determining whether the mobile management device 30 corresponding to the subscriber 20 exists. Also, when the single LTE subscriber 20 is located in the domestic area, the roaming determination unit 160 can know that the corresponding single LTE subscriber 20 is located in the home based on the location registration of the single LTE subscriber 20.

The failure occurrence determining unit 110 determines whether or not the single LTE subscriber 20 is located in the home by the roaming determining unit 160. If the single LTE subscriber 20 is located in the home, It is preferable to determine whether or not a fault has occurred.

The message receiving unit 170 may receive a Short Message Relay (SMR) message from the message application server 40 including information on whether a failure has occurred in the call control function device 10. [ Here, the message application server 40 is an application for providing an SOI service to the single LTE subscriber 20, and may be implemented as a Message Gateway-Application Server (MSG-AS). A method of transmitting the SMR message including information on whether or not a failure of the call control function device 10 occurs to the home subscriber server 100 by the message application server 40 will be described later.

When the single LTE subscriber 20 performs location re-registration through another call control function device based on the SMR message received through the message receiving unit 170, the home subscriber server 100 transmits the re-registered call control function device 10 to provide the SOI (SMS over IMS) service to the single LTE subscriber 20.

6 is a diagram schematically showing a configuration of an application server according to the first embodiment of the present invention. The application server according to the present embodiment is an application server that provides the SOI service to the single LTE subscriber 20 and can be implemented by the MSG-AS 40 shown in FIG.

6, the application server 40 according to the present embodiment may include a monitoring information input unit 42, a flag setting unit 44, a flag search unit 46, and a message transmission unit 48.

The monitoring information input unit 42 receives performance monitoring information for each call control function device. At this time, when the LTE network manager inputs performance monitoring information for each call control function device to the home subscriber server 100, the monitoring information input unit 42 receives the same information as the performance monitoring information from the LTE network manager, The server 100 may receive the performance monitoring information of the call control function device corresponding to each state management message from the home subscriber server 100 when the server 100 periodically transmits and receives the state management message for each call control function device.

When the performance monitoring information is inputted through the monitoring information input unit 42, the flag setting unit 44 sets a failure flag of the call control function device 10 corresponding to each performance monitoring information inputted. For example, when the performance monitoring information input through the monitoring information input unit 42 is a failure, the flag setting unit 44 sets the failure flag of the call control function device 10 corresponding to the performance monitoring information to '1' . At this time, the flag setting unit 44 matches the flag of the set call control function device with the identification information of each corresponding call control function device 10 and stores the flag.

The flag retrieval unit 46 retrieves a failure flag of the call control function device 10 corresponding to the single LTE subscriber 20 when a reception of a text message to the single LTE subscriber 20 is requested. That is, if an incoming call of a text message is requested, the flag searching unit 46 searches for a failure flag to determine whether the call control function device 10 corresponding to the single LTE subscriber 20 is in a failure state.

When the call control unit 10 corresponding to the single LTE subscriber 20 is determined to be a failure by the flag retrieval unit 46, the message transmission unit 48 transmits a message indicating that the failure has occurred to the call control function device 10 And transmits an SMR message including information to the home subscriber server 100. At this time, the message transmission unit 48 not only receives information on the occurrence of a failure of the call control function device 10 corresponding to the single LTE subscriber 20, but also information on the occurrence of a failure of the other call control function device 10 It is preferable to include them in the SMR message for transmission.

Thereafter, the home subscriber server 100 induces the single LTE subscriber 20 to re-register its position through the mobility management device 30 based on the above-described operation, and the application server 40 transmits the single LTE subscriber 20 Can provide the SOI service to the single LTE subscriber 20 through the call control function device 10 having re-registered the location.

FIG. 7 is a flowchart illustrating a VoLTE reception service providing method according to the first embodiment of the present invention. The VoLTE reception service providing method according to the present embodiment can be performed by the home subscriber server 100 shown in FIGS.

4 to 7, the home subscriber server 100 periodically transmits and receives a status management message for each call control function device (S102). At this time, the home subscriber server 100 transmits the performance monitoring information to the message application server 40 in response to the status management message received for each call control function device, and receives the SMR message (S104).

When receiving a VoLTE incoming call (S106), the home subscriber server 100 determines whether the called party corresponding to the VoLTE incoming call is a single LTE subscriber (S108). At this time, if the called party of the VoLTE incoming call is determined to be a single LTE subscriber, the home subscriber server 100 determines whether the corresponding single LTE subscriber is in an overseas roaming state (S110).

If it is determined that the corresponding single LTE subscriber 20 is not in the roaming state, that is, the home subscriber server 100 determines that a failure has occurred in the call control function device 10 corresponding to the corresponding single LTE subscriber 20 (S112).

The home subscriber server 100 sends a CLR message to the mobility management apparatus 30 corresponding to the single LTE subscriber 20 when it is determined that there is a failure in the call control function device 10 corresponding to the single LTE subscriber 20 Thereby causing the corresponding single LTE subscriber 20 to re-register the location through another call control function device 10 (S114).

If there is no failure in the call control function device 10 corresponding to the corresponding single LTE subscriber 20, the home subscriber server 100 transmits the failure message to the single LTE subscriber 20 via the call control function device 10 The VoLTE incoming call can be normally provided (S116).

Also, if it is determined that the corresponding single LTE subscriber 20 is roaming overseas, the home subscriber server 100 may perform roaming incoming call processing according to the CS of the WCDMA to provide an incoming call to the single LTE subscriber 20 (S118).

In addition, if it is determined that the called party of the VoLTE incoming call is not a single LTE subscriber, the home subscriber server 100 may determine that the called party is a hybrid VoLTE subscriber and perform a hybrid VoLTE incoming call process to the called party (S120).

8 is another example of a VoLTE reception service providing method according to the first embodiment of the present invention. The VoLTE reception service providing method according to the present embodiment can be performed by the home subscriber server 100 shown in FIGS.

4, 5 and 8, the home subscriber server 100 can receive performance monitoring information for each call control function device from the LTE network manager (S202). At this time, the LTE network manager can input the same information as the performance monitoring information for each call control function device, which is input to the home subscriber server 100, to the message application server 40. In this case, The server 40 receives an SMR message including information on whether a failure has occurred in each call control function device (S204).

When receiving a VoLTE incoming call (S206), the home subscriber server 100 determines whether the called party corresponding to the VoLTE incoming call is a single LTE subscriber (S208). At this time, if the called party of the VoLTE incoming call is determined to be a single LTE subscriber, the home subscriber server 100 determines whether the corresponding single LTE subscriber is in an overseas roaming state (S210).

If it is determined that the corresponding single LTE subscriber 20 is not in the roaming state, that is, the home subscriber server 100 determines that a failure has occurred in the call control function device 10 corresponding to the corresponding single LTE subscriber 20 (S212).

The home subscriber server 100 sends a CLR message to the mobility management apparatus 30 corresponding to the single LTE subscriber 20 when it is determined that there is a failure in the call control function device 10 corresponding to the single LTE subscriber 20 Thereby causing the corresponding single LTE subscriber 20 to re-register the location through another call control function device 10 (S214).

If there is no failure in the call control function device 10 corresponding to the corresponding single LTE subscriber 20, the home subscriber server 100 transmits the failure message to the single LTE subscriber 20 via the call control function device 10 A VoLTE incoming call can be normally provided (S216).

Also, if it is determined that the corresponding single LTE subscriber 20 is roaming overseas, the home subscriber server 100 may perform roaming incoming call processing according to the CS of the WCDMA to provide an incoming call to the single LTE subscriber 20 (S218).

If it is determined that the called party of the VoLTE incoming call is not a single LTE subscriber, the home subscriber server 100 determines that the called party is a hybrid VoLTE subscriber and can perform hybrid VoLTE incoming call processing on the called party (S220).

9 is another example of a VoLTE reception service providing method according to the first embodiment of the present invention. The VoLTE reception service providing method according to the present embodiment can be performed by the application server 40 shown in Figs. 4 and 5. Here, the application server 40 is implemented as the MSG-AS 40 that provides the SOI service to the single LTE subscriber 20.

4, 5 and 9, the application server 40 receives performance monitoring information for each call control function device (S302). At this time, when the LTE network manager inputs performance monitoring information for each call control function device to the home subscriber server 100, the application server 40 receives the same information as the performance monitoring information from the LTE network manager, The home agent server 100 may receive the performance monitoring information of the call control function device corresponding to each state management message when the home agent 100 periodically transmits and receives the state management message for each call control function device.

When the performance monitoring information is input, the application server 40 sets a failure flag of the call control function device 10 corresponding to each input performance monitoring information (S304). For example, when the input performance monitoring information indicates a failure of the call control function device, the application server 40 sets the failure flag of the call control function device 10 corresponding to the performance monitoring information to '1' . At this time, the application server 40 stores a flag indicating whether or not the set call control function device has failed, by matching with the identification information of each corresponding call control function device 10.

When a reception of a text message to the single LTE subscriber 20 is requested (S306), the application server 40 searches for a failure flag of the call control function device 10 corresponding to the corresponding single LTE subscriber 20 S308). That is, when a reception of a text message is requested, the application server 40 searches for a failure flag to determine whether the call control function device 10 corresponding to the corresponding single LTE subscriber 20 is in a failure state.

The application server 40 determines whether or not the call control function device 10 corresponding to the single LTE subscriber 20 has failed (S310) To the home subscriber server 100 (S312). At this time, the application server 40 not only informs the failure occurrence of the call control function device 10 corresponding to the single LTE subscriber 20, but also information about the failure occurrence of the other call control function device 10 It is preferable to include it in the SMR message and transmit it.

Thereafter, the home subscriber server 100 induces the single LTE subscriber 20 to re-register its position through the mobility management device 30 based on the above-described operation, and the application server 40 transmits the single LTE subscriber 20 Can normally provide the SOI service to the single LTE subscriber 20 through the call control function device 10 having re-registered the location.

Hereinafter, functions of a home subscriber server (HSS) according to a second embodiment of the present invention will be described.

An LTE (Long Term Evolution) communication network including the HSS according to the second embodiment of the present invention is as shown in FIG. The configuration of FIG. 10 is not largely different from that of the conventional configuration shown in FIG. 1, but there are differences in the functions of the individual components. In describing the second embodiment of the present invention, among the functions of the respective configurations defined in the 3GPP (Third Generation Partnership Project) standard, the description of those not related to the main features of the present invention can be omitted or simplified .

The communication network shown in Fig. 10 is an example of a destination communication network. In the case where the calling terminal is a terminal performing VoLTE (Voice Over LTE) communication, the calling side communication network is not different from the configuration of FIG. The LTE communication network of FIG. 10 may further include a SGW (Serving Gateway) or a PCR and a Policy and Charging Rule Function (PCRF).

In the figure, the communication terminal 1200 can perform a wireless communication with the eNB 1300 to originate or receive a call.

The eNB (Evolved Node B) 1300 provides a wireless interface to the communication terminal as described above, and includes a radio resource control function such as radio bearer control, radio admission control, dynamic radio resource allocation, load balancing, and inter- Management (RRM) function.

(PDN Gateway) 510 and 520 connects the UE 1200 to an external PDN (Packet Data Network) network 1600, provides packet filtering, allocates an IP address to the UE 1200, and provides a connection between 3GPP and non-3GPP And performs a function to operate as a mobility anchoring point upon handover.

That is, the PGWs 510 and 520 perform connection support so that the UE 1200 can perform IP-based communication (for example, VoLTE communication) through a PDN (for example, an IP Multimedia Subsystem (IMS)

MME (Mobility Management Entity) 1400 communicates with HSS 1100 for user authentication and user profile download and provides EPS mobility management (EMM) and EPS session management (ESM) functions to UEs via NAS signaling. That is, the MME 1400 performs mobility signaling between 3GPP networks as a kind of mobility management entity, and also provides network selection such as location registration and paging processes SGW, PGW, and SGSN for Idle terminals.

In particular, when the MME 1400 receives a reconnection request signal from the HSS for the destination terminal 1200, the MME 1400 transmits a reconnection request signal to the destination terminal 1200.

Meanwhile, the HSS 1100 provides the user authentication information and the user profile to the MME 1400 as a central DB having a user profile. That is, the HSS 1100 stores various information for connecting a call with the terminating terminal 1200 (for example, location information of a terminating terminal including information on devices to be passed through to connect to the terminating terminal) .

In particular, the HSS 1100 matches the PGWs 510 and 520 that are to be passed through to communicate with the terminating terminal 1200 to the called terminal. The specific function of the HSS 1100 corresponding to the main feature of the present invention is 11 with reference to the functional blocks.

As shown in the figure, the HSS 1100 includes a storage unit 1140, a receiving unit 1110, a determination unit 1120, and a transmission unit 1130.

In the storage unit 1140, various pieces of information about each communication terminal or subscribers are stored as described above. In particular, PGW information to be passed through to communicate with the communication terminal is matched with the corresponding communication terminal.

The receiving unit 1110 receives a request signal for a call connection with the terminating terminal 1200 according to a request from a calling terminal (not shown). For example, according to the INVITE signal of the originating terminal, a location information request signal (LIR) signal of the terminating terminal 1200 can be received as a request signal for call connection from a call-originating CSCF (Call Session Control Function) have.

Here, the CSCF is a component included in the IMS network associated with the LTE network for VoLTE communication, and its function is well known and will not be described in detail.

The determining unit 1120 determines whether the PGWs 510 and 520 matched to the terminating terminal 1200 are faulty or not according to a request signal for call connection received by the receiving unit 1110. [

For example, the determination unit 1120 can determine whether the PGWs 510 and 520 matched to the terminating terminal 1200 have failed using the information stored in the storage unit 1140. This is because the administrator manually determines the PGW This corresponds to the case where the failure status is input to the HSS 1100. That is, if the administrator registers the PGW list in which the failure occurs, the determination unit 1120 can compare the PGW matched to the terminating terminal with the failure PGW list to determine whether or not a failure has occurred.

If the faulty PGW list is stored in a separate external database (not shown) other than the HSS 1100, the judging unit 1120 judges that a failure occurs in the PGW matched to the terminating terminal 1200 through the communication with the external database It can be judged whether or not.

Alternatively, the determination unit 1120 may determine whether the PGWs 510 and 520 matched to the terminating terminal 1200 have occurred, based on communication with the PGWs 510 and 520 matched to the terminating terminal 1200.

At this time, communication with the PGWs 510 and 520 may be performed in real time, or may be performed periodically before a request signal for call connection is received, or upon detection of occurrence of a predetermined specific event.

In the case of real-time communication with the PGWs 510 and 520, if the PGWs 510 and 520 do not respond for a predetermined time, the determination unit 1120 may determine that a malfunction has occurred in the PGWs 510 and 520 matched to the terminating terminal 1200 . Alternatively, if the determination unit 1120 detects a malfunction of the PGWs 510 and 520 matched to the terminating terminal 1200 by communicating with the PGWs 510 and 520 in advance before receiving a request signal for call connection, It is possible to determine the fault occurrence state of the PGWs 510 and 520 matched to the terminating terminal 1200 at the time when the request signal for the PGWs 510 and 520 is received.

The transmission unit 1130 transmits a reconnection request for accessing the new PGWPGW 510 and 520 to the corresponding destination terminal 1200 when a failure occurs in the PGWs 510 and 520 matched to the destination terminal 1200 as a determination result of the determination unit 1120. [ And transmits a signal.

At this time, the transmitting unit 1130 can transmit a reconnection request signal to the terminating terminal 1200 via the MME 1400.

For example, the transmitter 1130 may transmit a CLR (SUBSCRIPTION WITHDRAW) signal to the MME 1400, i.e., the MME 1400 matched to the terminating terminal 1200, at which time the MME 1400 transmits a Detach Request Reattach Required signal to the terminating terminal 1200 so that the terminating terminal 1200 performs a reconnection process to match the new PGWs 510 and 520. [

Hereinafter, a communication process between the HSS 1100 and other devices according to the second embodiment of the present invention will be described with reference to FIG.

First, it is assumed that a malfunction has occurred in the first PGW 1510 in which a session with the terminating terminal has been established, and the corresponding session is deleted (step S401).

When receiving a call connection request, that is, a location information request (LIR), from the caller (step S403), the HSS 1100 receives a PGW corresponding to the called terminal, that is, a failure occurs in the first PGW 1510 (Step S405).

If a failure occurs in the first PGW 1510 (step S407), the HSS 1100 transmits a CLS (SUBSCRIPTION WITHDRAW) signal to the destination MME 1400 (step S409).

Upon receiving the CLR signal from the HSS 1100, the MME 1400 cancels the existing connection to the terminating terminal 1200 and transmits a Detach Request (Reattach Required) signal to try a new connection (step S411).

The receiving terminal 1200 receiving the Detach Request (Reattach Required) signal from the MME 1400 transmits an Attach Request signal for connection to the new PGW 1520 (step S413).

The Attach Procedure proceeds by communication between the terminating terminal 1200 and the second PGW 1520 (step S415).

When the destination terminal 1200 performs a new connection for VoLTE communication, it goes through the above-described Attach Procedure procedure (first procedure) and then goes through the registration procedure to the IMS network, that is, the IMS Registration Procedure procedure (second procedure) Step S417), and the flow of the first step and the second step performed according to the request of the destination terminal 1200 corresponds to a known technique, and thus a detailed description will be omitted.

Thereafter, the terminating terminal 1200 is connected to the IMS 1600 network via the second PGW 1520 (step S419) and can eventually perform the VoLTE communication. In this case, do.

The process of connecting a call from an originating terminal to a terminating terminal 1200 according to the present invention is shown in FIG.

The difference between FIG. 13 and FIG. 3 is clear from the flowchart of FIG.

13, when a failure occurs in the PGW matched to the terminating terminal 1200, the terminating terminal 1200 accesses a new PGW under the control of the HSS so that the INVITE signal of the originating terminal is normally transmitted to the terminating terminal .

Claims (20)

1. A VoLTE incoming call service providing system for providing a VoLTE (Voice over LTE) call service based on an IMS (IP Multimedia Subsystem) to a single LTE subscriber in an LTE (Long Term Evolution)
A call connection supporting entity supporting a call connection to the single LTE subscriber; And
Wherein the single LTE subscriber manages the state for each call connection supporting entity, and when a failure occurs in a call connection supporting entity corresponding to the single LTE subscriber, the single LTE subscriber transmits a different call connection through the mobility management apparatus corresponding to the position of the single LTE subscriber A home subscriber server for guiding the support entity to re-register;
And a VoLTE receiving service providing system. The method according to claim 1,
The call connection supporting entity includes a call control function device for performing a location registration and a multimedia call processing function for the single LTE subscriber by using a SIP (Session Initiation Protocol) and a PGW function for allowing the single LTE subscriber to access the IMS network (Pactet Data Network Gateway). ≪ RTI ID = 0.0 > [10] < / RTI > A failure occurrence determiner for determining whether a failure occurs in a call connection supporting entity corresponding to the single LTE subscriber when a VoLTE incoming call occurs in a single LTE subscriber; And
A re-registration inducing unit for re-registering the single LTE subscriber through the mobility management apparatus corresponding to the location of the single LTE subscriber when the failure occurrence determining unit determines that a failure has occurred in the call connection supporting entity;
/ RTI >
And a VoLTE incoming call is provided to the single LTE subscriber through a call connection supporting entity whose location is re-registered by induction of the re-registration inducing unit. The method of claim 3,
Wherein the call connection supporting entity is a call control function device that performs location registration and multimedia call processing functions for the single LTE subscriber by using a Session Initiation Protocol (SIP). 5. The method of claim 4,
A state management unit for periodically transmitting and receiving a state management message for each call control function device and managing states of each state based on a transmitted and received state management message;
Further comprising:
Wherein the failure occurrence determination unit determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs based on a state management message transmitted and received by the state management unit. 5. The method of claim 4,
A monitoring information input unit for receiving performance monitoring information for each call control function device from an LTE network manager;
Further comprising:
Wherein the failure occurrence determination unit determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs based on the performance monitoring information input through the monitoring information input unit. 5. The method of claim 4,
A calling party determining unit for determining whether a called party corresponding to a VoLTE incoming call is the single LTE subscriber;
Further comprising:
Wherein the failure occurrence determination unit determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs if the called party determination unit determines that the called party is the single LTE subscriber. 8. The method of claim 7,
A roaming determining unit for determining whether the single LTE subscriber is roaming if the called party determining unit determines that the called party is the single LTE subscriber;
Further comprising:
Wherein the failure occurrence determination unit determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs if the single LTE subscriber is located in the home by the roaming determination unit. 8. The method of claim 7,
A message receiving unit for receiving a Short Message Relay (SMR) message from the message application server, the message including failure occurrence information of the call control function device;
Further comprising:
When the single LTE subscriber performs location re-registration through another call control function device based on the SMR message received through the message receiver, the single LTE subscriber is notified of the SMS over IMS) service is provided to the home subscriber server. 1. A home subscriber server for storing information for subscriber mobility management,
A receiving unit for receiving a request signal for a call connection with a destination terminal according to a request from the calling terminal;
A determination unit for determining whether a packet data network gateway (PGW) matching the destination terminal has failed according to a request signal for call connection received by the reception unit;
And a transmission unit for transmitting a reconnection request signal for a new PGW connection to the destination terminal when a failure occurs in the PGW matched to the destination terminal as a result of the determination by the determination unit. In an application server providing an SOI (SMS over IMS) service to a single LTE subscriber,
A monitoring information input unit for receiving performance monitoring information for each call control function device;
A flag setting unit for setting a failure flag of a call connection supporting entity corresponding to each performance monitoring information inputted when the performance monitoring information is input through the monitoring information input unit;
A flag retrieval unit for retrieving a failure flag of a call connection supporting entity corresponding to the single LTE subscriber when a character incoming call is requested to the single LTE subscriber; And
A message transmission unit for transmitting an SMR message including information on the call connection supporting entity to the home subscriber server when the flag searching unit determines that the call connection supporting entity corresponding to the single LTE subscriber is a failure;
/ RTI >
Wherein the single LTE subscriber provides an SOI service to the single LTE subscriber through a call connection supporting entity re-registered with the location by the control of the home subscriber server. A method for providing a VoLTE incoming call service performed by a home subscriber server,
Determining whether a failure occurs in a call connection supporting entity corresponding to the single LTE subscriber when a VoLTE incoming call occurs in the single LTE subscriber; And
If it is determined by the failure occurrence determination step that a failure has occurred in the call connection supporting entity, inducing re-registration of the single LTE subscriber through the mobility management apparatus corresponding to the position of the single LTE subscriber;
/ RTI >
And controlling the VoLTE termination call to be provided to the single LTE subscriber through a call connection supporting entity whose location is re-registered by the location re-registration inducing step. 13. The method of claim 12,
Wherein the call connection supporting entity is a call control function device for performing a location registration and a multimedia call processing function for the single LTE subscriber using a SIP (Session Initiation Protocol). 14. The method of claim 13,
Transmitting and receiving a status management message periodically for each call control function device, and managing each status based on a status management message transmitted and received;
Further comprising:
Wherein the failure occurrence determination step determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs based on the status management message transmitted / received by the status management step. 14. The method of claim 13,
Receiving performance monitoring information for each call control function device from an LTE network manager;
Further comprising:
Wherein the failure occurrence determination step determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs based on the performance monitoring information input through the performance monitoring information input step . 14. The method of claim 13,
Determining whether a called party corresponding to a VoLTE incoming call is the single LTE subscriber;
Further comprising:
Wherein the failure determination step determines whether a failure of the call control function device corresponding to the single LTE subscriber occurs if the called party is determined to be the single LTE subscriber by the called party determination step. Way. 17. The method of claim 16,
Determining whether the single LTE subscriber roams if the called party is determined to be the single LTE subscriber by the called party determination step;
Further comprising:
Wherein the step of determining whether or not a failure occurs is determined by determining whether or not a failure of the call control function device corresponding to the single LTE subscriber occurs when the single LTE subscriber is located in the home by the roaming determination step Way. 17. The method of claim 16,
Receiving a short message relay (SMR) message from the message application server, the short message relay message including fault occurrence information of the call control function device;
Further comprising:
When the single LTE subscriber performs location re-registration through another call control function device based on the SMR message received through the message receiving step, the single LTE subscriber is notified of the SOI (SMS over IMS) service is provided. A control method of a home subscriber server for storing information for managing subscriber mobility,
(a) determining whether a Packet Data Network Gateway (PGW) matching the destination terminal has failed if a request signal for a call connection with the destination terminal is received according to a request from the source terminal;
(b) transmitting a reconnection request signal for a new PGW connection to the destination terminal if a failure occurs in the PGW matched to the destination terminal as a result of the determination in step (a) / RTI > A method for providing a VoLTE incoming call service performed by an application server that provides an SOI service to a single LTE subscriber,
Receiving performance monitoring information for each call control function device;
Setting a failure flag of a call connection supporting entity corresponding to each performance monitoring information inputted when the performance monitoring information is inputted through the performance monitoring information inputting step;
Searching for a failure flag of a call connection supporting entity corresponding to the single LTE subscriber if a character incoming request for the single LTE subscriber is requested; And
Transmitting an SMR message including information on a call connection supporting entity to a home subscriber server if the call connection supporting entity corresponding to the single LTE subscriber is determined as a failure by the flag searching step;
/ RTI >
Wherein the single LTE subscriber provides an SOI service to the single LTE subscriber through a call connection supporting entity that has re-registered its location under the control of the home subscriber server.

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