KR101404559B1 - Apparatus for processing call between heterogeneous networks and method therefor - Google Patents

Abstract

In the present invention, in a VoLTE call processing in a heterogeneous communication network such as a 2G, 3G WCDMA network, and a legacy network, an IMS network HLR for a terminal device subscribed to a VoLTE service, If there is an incoming call request from the terminal device of the legacy network to the VoLTE service terminal device of the EPC network in consideration of the terminal type of the VoLTE service terminal device requested in the HLR, the location registered network, the IMS registration state, The call processing method capable of increasing the incoming success rate is selected and the incoming information according to the selected method is provided to the legacy network so that the call success rate to the VoLTE service terminal can be increased.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heterogeneous communication network,

The present invention relates to a voice service in an LTE network, and more particularly, to a voice service in VoLTE (Voice over LTE) in a heterogeneous communication network such as a legacy network such as a 2G or 3G WCDMA network and an evolved packet core After registering the location information and the terminal type information of the terminal apparatus in the IMS (IP Multimedia Core Network Subsystem) network HLR with respect to the terminal apparatus subscribed to the VoLTE service, the terminal apparatus registers the terminal type information of the terminal apparatus to the VoLTE service terminal apparatus of the EPC network When there is an incoming call request, the HLR selects a call processing method capable of increasing the call success rate in consideration of the terminal type of the VoLTE service terminal apparatus requested to be called, the location registered network, the IMS registration state, To a legacy network, thereby increasing the call success rate to the VoLTE service terminal apparatus.

A 3rd Generation Partnership Project (3GPP) mobile communication system based on WCDMA (Wideband Code Division Multiple Access) radio access technology is widely deployed all over the world. HSDPA (High Speed Downlink Packet Access), which can be defined as the first evolutionary phase of WCDMA, provides 3GPP mobile communication system with highly competitive wireless access technology in the mid-term future.

However, as the requirements and expectations of users and operators continue to increase and competition for developing wireless access technologies continues, there is a need to evolve new technologies in 3GPP mobile communication systems in order to gain competitiveness in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interfaces, and proper power consumption of terminals are becoming a requirement. In addition, prevention of unnecessary latency at the network node and efficient use of network resources can also promote the technology evolution in 3GPP.

In 3GPP Release 8, a Network Architecture called Evolved Packet Core (EPC) is described as one of mobile communication systems for meeting the above-mentioned requirements. EPC is a set of network nodes for 3GPP LTE (Long Term Evolution) system. The EPC evolves the core network of the existing 3GPP system architecture to support Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), which is an evolved RAN, And has an efficient network structure that simplifies the network node.

Meanwhile, as described above, EPC or LTE, which is a fourth generation mobile communication, must implement IMS-based VOIP technology in order to provide a voice service as a base of a mobile communication service as a data-only network. In this way, the service proposed to enable voice communication in EPC or LTE is called VoLTE (Voice over LTE) service.

According to this VoLTE service, it is possible to provide 4 ~ 5 times cleaner HD voice call service in case of voice call, and users can share contents such as map, music, news, can do.

In addition, in the initial stage of establishing the LTE mobile communication system, a mixed communication environment with a legacy network such as a WCDMA mobile communication system appears. In such a communication environment, a dual mode capable of accessing an LTE network and accessing a legacy network such as a WCDMA network dual mode terminal device can be operated.

In the early stage of the LTE mobile communication service, a WCDMA mobile communication system was used to provide a voice communication service to a dual mode terminal, and an LTE mobile communication system was used to provide a data communication service.

Here, in order to provide a VoLTE service satisfactory to the user, it is important to provide a clear voice quality voice call service after making a call connection between the calling party and the called party, but above all, a high incoming success rate must be provided.

However, a voice call processing technique for guaranteeing a high call success rate in a mixed environment of a 3GPP LTE network and a legacy network has not yet been developed.

(Patent Literature)

Korean Patent Laid-Open Publication No. 10-2012-0006786 discloses a communication method for call session processing based on an IMS network and a device implementing the same.

Therefore, in the VoLTE call processing in a heterogeneous communication network such as a 2G or 3G WCDMA network and a legacy network such as an EPC network, in the case of a terminal device subscribed to a VoLTE service, position information in an IMS network HLR and terminal type After the information is registered, if there is an incoming call request from the terminal device of the legacy network to the VoLTE service terminal device of the EPC network, information such as the terminal type, the location registered network, and the IMS registration state of the VoLTE service terminal device requested in the HLR And a call processing method capable of increasing the incoming success rate by considering the selected incoming call information and providing the incoming call information according to the selected method to the legacy network, thereby increasing the call success rate to the VoLTE service terminal apparatus I want to.

A subscriber information management unit for managing the terminal type and the location information of the terminal apparatus; a request reception unit for receiving a request for a call from the first communication network to the terminal apparatus located in the second communication network, A network connection unit for transmitting the called information generated in response to the request; and a receiving unit for receiving the incoming information previously set corresponding to the terminal type and the location information of the terminal apparatus, when receiving the incoming request, And a controller.

The subscriber information management unit receives the network information registered by the terminal apparatus and the registration status information of the IMS network of the terminal apparatus through the IMS network in which the terminal apparatus is located, .

If the terminal type of the terminal device is a terminal type capable of performing voice service in both the first communication network and the second communication network and the terminal device can receive voice service in the second communication network, The originating exchange of the first communication network returns an IMG routing number that can be connected to the terminal apparatus as call destination information.

In addition, the control unit is characterized in that, when the terminal apparatus is registered in the second communication network and normally registered in the IMS network, the terminal apparatus is determined to be able to receive a voice service in the second communication network .

When the terminal type of the terminal device is a terminal type capable of providing a voice service in both the first communication network and the second communication network or the terminal device can not receive a voice service in the second communication network, And the MSRN information capable of performing an incoming process to the terminal apparatus is provided to the caller-side switching center of the first communication network.

If the terminal is registered in the first communication network or the second communication network and is not registered in the IMS network, or if the terminal is registered in the first communication network and normally registered in the IMS network It is determined that the terminal device can not receive the voice service in the second communication network.

Further, the control unit receives the MSRN information capable of performing an incoming process from the called party exchange after performing the PRN to the called party exchange to which the terminal apparatus belongs.

In addition, the first communication network is a 2G or 3G network, and the second communication network is an LTE network.

In addition, the terminal device is a terminal device implemented to enable voice service in an LTE network.

The present invention also provides a method for processing a call between two heterogeneous communication networks, the method comprising the steps of: registering a terminal type and location information of a terminal device to be call processed; receiving a call request for the terminal device located in the second communication network from the first communication network; Setting the call destination information according to the terminal type and location information of the terminal apparatus when receiving the call reception request and providing the call reception information to the exchange of the terminal apparatus that has requested the call reception.

In addition, the step of setting the incoming information may include: when the terminal type of the terminal apparatus is a terminal type capable of performing voice service in both the first communication network and the second communication network, the terminal apparatus receives the voice service in the second communication network And setting an IMG routing number that can be connected to the terminal apparatus as the incoming information when the second communication network is capable of receiving the voice service, .

The method may further comprise setting MSRN information capable of performing an incoming call to the terminal device as the incoming information when the second communication network can not receive the voice service.

In the VoLTE call processing in a heterogeneous communication network such as a 2G, 3G WCDMA network, and a legacy network such as an EPC network, location information and terminal type information of a terminal device are added to an IMS network HLR for a terminal device subscribed to a VoLTE service If there is an incoming call request from the terminal device of the legacy network to the VoLTE service terminal device of the EPC network in consideration of the terminal type of the VoLTE service terminal device requested in the HLR, the location registered network, the IMS registration state, There is an advantage in that it is possible to increase a call success rate to the VoLTE service terminal apparatus by selecting a call processing method capable of increasing the call success rate and providing the call information according to the selected method to the legacy network.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a heterogeneous mobile communication hybrid service system including a heterogeneous mobile communication hybrid call processing apparatus to which an embodiment of the present invention is applied;
FIG. 2 is a conceptual diagram illustrating the operation of selecting a destination network in the HLR for connecting an incoming call to a VoLTE subscriber among heterogeneous communication networks according to an embodiment of the present invention;
3 is a detailed block diagram of an HLR according to an embodiment of the present invention;

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

FIG. 1 is a configuration diagram of a heterogeneous mobile communication hybrid service system including a heterogeneous mobile communication hybrid call processing apparatus to which an embodiment of the present invention can be applied. FIG. 1 illustrates a case where a WCDMA mobile communication system 100 operates as a legacy network. The WCDMA mobile communication system 100 includes a LTE (Long Term Evolution) mobile communication system 200, But the present invention is not limited to this. For example, other asynchronous mobile communication systems such as GSM (Global System for Mobile) or other synchronous mobile communication systems such as CDMA2000 and the like may be used together with the LTE mobile communication system 200, An example will be described.

The WCDMA mobile communication system 100 includes a Node B 110, an RNC 120, a Mobile Switching Center / Visitor Location Register (MSC / VLR) 130, a CGS 140, (Serving General Packet Radio Service Support Node) 150 and a Gateway General Packet Radio Service Support Node (GGSN) 160.

The Node B 110 and the RNC 120 correspond to a radio access network area and the MSC / VLR 130 and the CGS 140 correspond to a circuit exchange core network. The SGSN 150 and the GGSN 160 exchange packets. Corresponds to the core network.

The NodeB 110 is composed of a plurality of cells, and a plurality of terminal devices can be connected to the cells. The NodeB 110, which is an aggregate of these cells, secures the frequency used for connection with the terminal devices and ensures a stable connection with the terminal devices.

The RNC 120 controls a plurality of NodeBs 110, allocates communication resources to each of the NodeBs 110, and handles functions such as handover.

The MSC / VLR 130 stores visitor location information, receives subscriber profile information, authentication and location related data from the HLR 410, and performs switching control for voice communication.

The CGS 140 serves as a gateway for connecting the WCDMA mobile communication system 100 to the general communication network, and enables communication with other communication systems connected to the general communication network. For example, the CGS 140 serves as a gateway between the circuit network 420 and the MSC / VLR 130 and is connected to the LTE mobile communication system 200 through the IMS 300 connected to the circuit network 420, Thereby enabling circuit communication between the systems 100. This CGS 140 may also be referred to as a GMSC (Gateway MSC) or a gateway exchange.

The SGSN 150 and the GGSN 160 belonging to the packet-switched core network area are connected to an IP network 430 such as the Internet, that is, a packet data network (PDN), to receive a packet- IP-based protocol interworking for matching with

For this, the SGSN 150 is connected to the RNCs 120 to manage the mobility of the mobile communication terminal and the packet session management. The GGSN 150 sets a PDP context with the GGSN 160, And performs the function of transmitting the data unit. Also, the SGSN 160 can perform IP routing and can perform an interaction such as location registration of the mobile communication terminal.

The GGSN 160 directly connects to the IP network 430 and acts as a gateway for connecting the IP network 430 and the packet switched (PS) domain of the WCDMA mobile communication system 100. The SGSN 150, And maintains routing information with the external network, and performs tunneling and IP routing functions.

The LTE mobile communication system 200 includes an eNodeB 210, an MME 220, an S-GW 230, a PDN GW 240, and a Policy & Charging Rule Function (PCRF)

The eNodeB 210 is a device that supports next generation technologies and services such as LTE, and functions as radio frequency (RF) transmission of transmission signals, measurement of signal strength and quality of transmission and reception, baseband signal processing, and channel card resource management . The eNodeB 210 ensures a stable connection with a plurality of terminal devices.

The MME 220 manages mobility of a terminal device, and is responsible for session management, idle subscriber management, paging, and subscriber authentication functions. That is, the MME 220 performs control such as processing a control signal when there is a binding request from the terminal device or another network node, for example, from the PDN GW 240 or the S-GW 230, And receives the subscriber profile information, authentication and location-related data from the HLR 410, and controls the setting of an EPS bearer or an IP tunnel, mobility management, and the like Function.

The S-GW 230 is a user plane node that performs session control for processing payload traffic according to a set session. The S-GW 230 interfaces with the eNodeB 210 through an S1-U interface, (Handover) in the communication system 200 and the 3GPP, establishes an ESP bearer (Evolved Packet System bearer) with the PDN GW 240, and delivers PDU (Packet Data Unit) using tunneling.

The PDN GW 240 is a user plane node that assigns an IP address of a terminal device and performs session control in cooperation with an external Internet network and a non-3GPP network. The PDN GW 240 is a user plane node that provides S- And has tunneling and IP routing functions. And delivers the PDU to the S-GW 230 and the external network.

The PCRF 250 provides dynamic QoS and billing rules according to the service data flow to perform communication policies and billing processing in the communication network.

The IP Multimedia Subsystem (IMS) 300 includes a Call Session Control Function (CSCF) 310, an Inter-working Media Gateway (IMG) 320, and a Home Location Register (HLR)

CSCF 310 is an infrastructure system that performs call processing and performs basic functions for multimedia session control based on SIP (Session Initiation Protocol). The CSCF 310 handles subscriber registration, authentication, billing, triggering and routing by service, inquiry of the location of the called party, compression and release of SIP messages, and can be divided into Proxy_CSCF, Interogating-CSCF and Serving-CSCF according to their roles.

The IMG 320 converts signaling and media for interworking with the LTE mobile communication system 200 connected to the CSCF 310 and the WCDMA mobile communication system 100 connected to the circuit network 420.

The HLR 330 is a network node including a data base including subscriber information for a wireless communication system for the WCDMA mobile communication system 100 and / or the LTE mobile communication system 200, Information, authentication, and location-related data.

In the embodiment of FIG. 1, the WCDMA mobile communication system 100 and the LTE mobile communication system 200 operate the HLR 410 in an integrated manner, and the IMS 300 operates the HLR 330 independently , The WCDMA mobile communication system 100 or the LTE mobile communication system 200 may also operate the HLRs independently. In addition, the WCDMA mobile communication system 100, the LTE mobile communication system 200, and the IMS 300 may operate one HLR in an integrated manner.

FIG. 2 illustrates a concept of a destination network selection operation in the HLR 410 for connecting an incoming VoLTE subscriber call between heterogeneous communication networks according to an embodiment of the present invention.

Hereinafter, an operation for connecting an incoming call to the VoLTE service terminal apparatus 60 in the HLR 410 will be described in detail with reference to FIG.

First, the VoLTE service terminal apparatus 60 transmits information of a location-registered network to which the IMS network 300 is currently connected to the IMS network 300, and performs location registration of the IMS network 300.

Accordingly, the CSCF 310 of the IMS network 300 transmits information of the network where the VoLTE service terminal apparatus 60 registers the location and location registration information of the IMS network 300 to the HLR 410 (S100).

In order to transmit the location registration network information of the VoLTE service terminal 60 and the location registration information of the IMS network 300 between the IMS network 300 and the HLR 410, a MAP-ANY-TIME-MODIFICATION message An extension container as shown in [Table 1] below is defined and utilized.

Then, the HLR 410 stores information such as location registered network information of the VoLTE service terminal 60 and whether the IMS network 300 is registered in the subscriber information DB.

At this time, the HLR 410 receives the VoLTE service subscription information and terminal type information for the subscriber information managing subscriber information from the network, and provision the subscriber information DB.

[Table 1] defines the service support authority according to the terminal type and the terminal type of the VoLTE service terminal apparatus 60.

Terminal type (VoLTE ~) authority Remarks Single Voice only Supports VoLTE voice only Single Video Supports only VoLTE voice and video Dual Voice only Supports VoLTE voice and CS (CSFB) voice call but does not support video Dual Video WCDMA Supports both VoLTE and CS (CSFB) voice calls, and supports only WCDMA (H.324M) video. Dual Video LTE Supports both VoLTE and CS (CSFB) voice calls, and Video supports VoLTE only

The HLR 410 refers to the service support authority according to the terminal type as shown in Table 2 and transmits the location registration request to the corresponding terminal device 60 to the VoLTE service terminal 60 requested from the IMS network 300. [ The incoming call information is provided to the originating exchange so that the incoming call will have a high connection success rate.

[Table 3] and [Table 4] below define HLR processing for incoming call connection according to the terminal type information of the VoLTE service terminal device 60 in the HLR 410. [Table 3]

TYPE of called terminal 3G / LTE location registration REGI of the called terminal. condition HLR processing Single Voice only
Single Video - - (To LOC / SRI return)
IMG routing number RETURN Dual Voice only
Dual Video WCDMA
Dual Video LTE LTE IMS regi. (To LOC / SRI return)
IMG routing number RETURN 3G IMS regi (After performing the PRN with the terminating exchange) Receive the MSRN and return LTE or 3G IMS not-regi

TYPE of called terminal 3G / LTE location registration and
IMS REGI. condition HLR processing (Dest. Domain) Single Voice only
Dual Voice only - If the outgoing is 2G, Bearer capa. not available processing
If the transmission is 3G, the bearer service not provisioned processing (hereinafter referred to as the switch non-standard fallback processing) Single Video LTE Location Registration & IMS regi. IMG routing LTE Location Registration & IMS not-regi.
3G Location Registration & IMS regi IMG routing Dual Video WCDMA - PRN and CS incoming processing Dual Video LTE LTE Location Registration & IMS regi. IMG routing LTE Location Registration & IMS not-regi.
3G Location Registration & IMS regi If the outgoing is 2G, Bearer capa. not available processing
If the transmission is 3G, the bearer service not provisioned processing (hereinafter referred to as the switch non-standard fallback processing)

On the basis of the HLR processing shown in [Table 3] and [Table 4] above, the HLR 410 refers to the terminal type of the VoLTE service terminal apparatus 60 and transmits the VoLTE The service terminal 410 performs signal processing to increase the incoming success rate with reference to whether the incoming call requested by the service terminal apparatus 410 is a voice call or a video call.

That is, for example, if the incoming call requested from the calling terminal device 50 of the legacy network to the VoLTE service terminal device 60 of the LTE network is a voice call and the terminal type of the corresponding VoLTE service terminal device is a single voice single voice only) or single video, this may mean that the VoLTE service terminal 60 is a terminal capable of providing voice or video service only in the LTE network. Accordingly, the HLR 410 notifies the VoLTE service terminal 60 of the originating exchange of the legacy network, regardless of the network information registered by the VoLTE service terminal apparatus 60 and the IMS network registration (REGI) status information, And returns a linkable IMG routing number to the called information.

Next, when the incoming call is a voice call and the terminal type of the VoLTE service terminal apparatus 60 is dual voice only, dual video WCDMA, or dual video LTE, the location registration information and the IMS And performs call processing in a different manner according to the registration status information.

For example, when the VoLTE service terminal apparatus 60 is registered in the LTE network 200 and normally registered in the IMS network 300, it means that the VoLTE service terminal apparatus 60 can perform VoLTE service Therefore, the HLR 410 returns the IMG routing number, which can be connected to the VoLTE service terminal apparatus 60, as the call information to the caller side exchange of the legacy network.

For example, if the VoLTE service terminal apparatus 60 is registered in the 3G networks 130 and 140 and registered normally in the IMS network, registered in the LTE network 200 or the 3G networks 130 and 140, The VoLTE service terminal 60 can not perform the VoLTE service. Therefore, the HLR 410 may perform a PRN (Provide Roaming Number) to the called party exchange, (Mobile Station Roaming Number) to the originating exchange of the legacy networks 130 and 140.

On the other hand, when the incoming call is a video call other than a voice call and the terminal type of the corresponding VoLTE service terminal apparatus 60 is single voice only or dual voice only, ), It is impossible to make a video call. Accordingly, the HLR 410 processes the video call failure when the calling terminal apparatus of the legacy networks 130 and 140 is 2G. If the calling terminal apparatus of the legacy networks 130 and 140 is the 3G terminal, And fallback processing is performed.

Next, when the incoming call is a video call and the terminal type of the VoLTE service terminal apparatus 60 is a single video, the HLR 410 transmits the network information registered by the VoLTE service terminal apparatus 60 to the IMS The originating exchange of the legacy networks 130 and 140 returns the IMG routing number that can be connected to the VoLTE service terminal apparatus 60 as call information regardless of the registration state of the network 300.

Next, when the incoming call is a video call and the terminal type of the corresponding VoLTE service terminal apparatus 60 is dual video WCDMA, this is because the VoLTE service terminal apparatus 60 is a terminal capable of video call only in the WCDMA network The HLR 410 does not consider the network information registered by the VoLTE service terminal apparatus 60 and the registration status of the IMS network 300 and performs an incoming process after performing a PRN (Provide Roaming Number) to the called party exchange Receives a possible Mobile Station Roaming Number (MSRN), and returns it to the originating exchange of the legacy networks 130 and 140.

Next, when the incoming call is a video call and the terminal type of the corresponding VoLTE service terminal apparatus 60 is dual video LTE, the HLR 410 transmits the position registered network information of the corresponding VoLTE service terminal apparatus 60 And the IMS network 300 according to the registration state information.

For example, when the VoLTE service terminal apparatus 60 is registered in the LTE network 200 and is normally registered in the IMS network 300, the HLR 410 transmits the VoLTE service to the originating exchange of the legacy networks 130 and 140 And returns the IMG routing number that can be connected to the terminal device 60 as the incoming information.

When the VoLTE service terminal apparatus 60 is registered in the LTE network 200 and not registered in the IMS network 300 or registered in the 3G networks 130 and 140 and normally registered in the IMS network 300 And so on. In this case, the HLR 410 processes the video call failure when the calling terminal apparatus of the legacy network 130 or 140 is 2G. If the calling terminal apparatus of the legacy network is the 3G, .

As described above, according to the incoming information request (S102) from the legacy networks 130 and 140, the HLR 410 determines the incoming information that can increase the incoming success rate and transmits it to the originating exchange of the legacy networks 130 and 140 (S104).

In the originating exchange of the legacy networks 130 and 140, according to the incoming information received from the HLR 410, for example, when the incoming information is the IMG routing number, the call connection is attempted to the IMG 320 (S106) .

3 illustrates a detailed block configuration of the HLR 410 according to an embodiment of the present invention and includes a network connection unit 400, a subscriber information management unit 404, a control unit 402, a subscriber information DB 406, can do.

Hereinafter, the operation of each component of the HLR 410 according to the embodiment of the present invention will be described in detail with reference to FIG.

First, the network connection unit 400 is an apparatus that performs communication with legacy networks 130 and 140 such as 2G and 3G, which are first communication networks, and is a second communication network example registered in the HLR 410 from the legacy networks 130 and 140 In response to the request, the control unit 402 receives an incoming call request for the VoLTE service terminal apparatus 60 located in the LTE network 200 and transmits the call information to the legacy network 130, Side exchanger.

The subscriber information management unit 404 manages the terminal type and location information of the VoLTE service terminal apparatus 60. That is, the subscriber information management unit 404 receives the network information registered by the VoLTE service terminal apparatus 60 and the IMS network 60 of the VoLTE service terminal apparatus 60 through the IMS network 300 in which the VoLTE service terminal apparatus 60 is located, Registration status information and manages it as location information of the corresponding VoLTE service terminal apparatus 60.

The control unit 402 controls the overall operation of the HLR 410. When receiving an incoming request to the VoLTE service terminal apparatus 60 from the first communication network 130 or 140 according to the embodiment of the present invention, The terminal type and location information of the VoLTE service terminal apparatus 60 stored in the VoLTE service terminal apparatus 60 and transmits the preset call information corresponding to the terminal type and location information of the VoLTE service terminal apparatus 60 to the legacy networks 130 and 140 To the originating side exchanger of the originating side.

Hereinafter, the operation of providing the call information to the caller-side switching center of the legacy networks 130 and 140 according to the terminal type and location information of the VoLTE service terminal apparatus 60 in the control unit 402 will be described in more detail.

First, the control unit 402 determines whether the call request from the legacy networks 130 and 140 is a voice call and the terminal type of the VoLTE service terminal apparatus 60 is a second communication network, for example, a terminal capable of performing voice service only in the LTE network 200 Type, the IML routing number that can be connected to the VoLTE service terminal apparatus 60 by the originating exchange of the legacy networks 130 and 140, regardless of the network information registered in the VoLTE service terminal apparatus 60 and the IMS registration state information, Reply with incoming information. At this time, the terminal type of the VoLTE service terminal apparatus 60 may be, for example, single voice only or single video.

The control unit 402 determines whether the terminal type of the VoLTE service terminal apparatus 60 is a voice call capable of performing voice service in both the legacy networks 130 and 140 and the LTE network 200 while the incoming request from the legacy networks 130 and 140 is a voice call, Even if the VoLTE service terminal apparatus 60 can receive voice service, that is, VoLTE service, in the LTE network 200, the VoLTE service terminal apparatus 60 can be connected to the VoLTE service terminal apparatus 60 by the caller- And returns the IMG routing number to the called information. At this time, the terminal type of the VoLTE service terminal 60 may be, for example, dual voice only, dual video WCDMA, or dual video LTE. When the VoLTE service terminal apparatus 60 is registered in the LTE network 200 and normally registered in the IMS network 300, the control unit 402 controls the VoLTE service terminal apparatus 60 in the LTE network 200 It can be judged that the voice service can be received.

However, if the terminal type of the VoLTE service terminal apparatus 60 is a terminal type capable of providing voice service in both the legacy networks 130 and 140 and the LTE network 200 or a terminal type in which the VoLTE service terminal apparatus 60 can not receive the voice service, The control unit 402 provides the MSRN information enabling the reception processing to the VoLTE service terminal apparatus 60 to the originating exchange of the legacy networks 130 and 140. [ That is, the control unit 402 receives the MSRN information capable of performing the reception processing from the called party exchange, and provides the MSRN information to the originating exchange of the legacy networks 130 and 140 after performing the PRN to the called party exchange that the VoLTE service terminal apparatus 60 belongs to .

When the VoLTE service terminal apparatus 60 is registered in the legacy network 130 or 140 or the LTE network 200 and is not registered in the IMS network 300 or the legacy network 130, 140 and registered in the IMS network 300, the VoLTE service terminal 60 can determine that the LTE network 200 can not receive the voice service.

If the incoming call request from the legacy network legacy network 130 or 140 is an image call, the control unit 402 determines whether the terminal type of the VoLTE service terminal apparatus 60 is a video call- Type, it transmits a failure of a video call or performs a fallback process for switching a voice call. At this time, the terminal type of the VoLTE service terminal apparatus 60 may be, for example, single voice only or dual voice only.

If the terminal type of the VoLTE service terminal apparatus 60 is a terminal type capable of video call only in the LTE network 200, the control unit 402 may transmit the network information registered by the VoLTE service terminal apparatus 60 to the IMS network registration state The caller side exchange of the legacy networks 130 and 140 returns the IMG routing number that can be connected to the VoLTE service terminal apparatus 60 as call information regardless of the information. At this time, the terminal type of the VoLTE service terminal apparatus 60 may be, for example, a single video only case.

When the terminal type of the VoLTE service terminal apparatus 60 is dual video WCDMA, the controller 402 determines that the VoLTE service terminal apparatus 60 is a terminal capable of video call only in the WCDMA network, Receives a Mobile Station Roaming Number (MSRN) capable of performing an incoming process after performing a Provide Roaming Number (PRN) to the called party exchange without taking into consideration the location registration network information and the IMS network registration state, Reply to the exchange.

When the terminal type of the VoLTE service terminal apparatus 60 is dual video LTE, the control unit 402 performs call processing according to the location registered network information of the VoLTE service terminal apparatus 60 and the IMS network registration state information It is performed adaptively differently.

For example, when the VoLTE service terminal apparatus 60 is registered in the LTE network 200 and is normally registered in the IMS network 300, the VoLTE service terminal apparatus 60 is connected to the originating exchange of the legacy networks 130 and 140, And the IMG routing number that can be connected with the call forwarding information.

It is also possible that the VoLTE service terminal apparatus 60 is registered in the LTE network 200 and not registered in the IMS network 300 or registered in the 3G network and registered normally in the IMS network 300 . In this case, the control unit 402 processes the video call failure when the calling terminal apparatus of the legacy network 130 or 140 is 2G. If the calling terminal apparatus of the legacy network 130 or 140 is the 3G terminal, Switch to fallback processing.

As described above, in the present invention, in a VoLTE call processing in a heterogeneous communication network such as a 2G, 3G WCDMA network, and the like, a terminal apparatus subscribed to a VoLTE service is provided with location information in an IMS network HLR, If there is an incoming request from the terminal device of the legacy network to the VoLTE service terminal device of the EPC network after registering the terminal type information of the VoLTE service terminal device in the HLR, A call processing method capable of increasing the incoming success rate in consideration of the information of the VoLTE service terminal apparatus and providing the incoming information according to the selected method to the legacy network.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should not be limited by the described embodiments but should be defined by the appended claims.

In the present invention, in a VoLTE call processing in a heterogeneous communication network such as a 2G, 3G WCDMA network, and a legacy network, an IMS network HLR for a terminal device subscribed to a VoLTE service, If there is an incoming call request from the terminal device of the legacy network to the VoLTE service terminal device of the EPC network in consideration of the terminal type of the VoLTE service terminal device requested in the HLR, the location registered network, the IMS registration state, The call processing method capable of increasing the call success rate can be selected, and the call information according to the selected method can be provided to the legacy network, which can be applied to the EPC network.

400: network connection unit 402:
404: Subscriber information management unit 406: Subscriber information DB

Claims (12)

Management of the terminal type of the terminal apparatus, receiving the network information on which the terminal apparatus is registered through the IMS network in which the terminal apparatus is located and the registration state information of the IMS network of the terminal apparatus, A subscriber information management unit for managing the subscriber information,
A network connection unit for receiving a reception request for the terminal device located in the second communication network from the first communication network and transmitting the generated reception information according to the request,
Wherein the terminal type of the terminal device is a terminal type in which voice service is available in both the first communication network and the second communication network according to the terminal type and location information of the terminal device when receiving the incoming request, To the originating exchange of the first communication network, the IMG routing number, which can be connected to the terminal apparatus, as the reception information,
And a communication unit for communicating with the mobile communication terminal. delete delete The method according to claim 1,
Wherein,
When the terminal device is registered in the second communication network and normally registered in the IMS network, the terminal device determines that the terminal device can receive voice service in the second communication network, . The method according to claim 1,
Wherein,
When the terminal type of the terminal device is a terminal type in which voice service is available in both the first communication network and the second communication network or when the terminal device can not receive voice service in the second communication network, Side MSCN-side MSCN-side MSCN-side MSCN-side MSCN. 6. The method of claim 5,
Wherein,
When the terminal device is registered in the first communication network or the second communication network and is not registered in the IMS network or is registered in the first communication network and is normally registered in the IMS network, Is determined to be in a state in which the second communication network can not receive the voice service. 6. The method of claim 5,
Wherein,
Wherein the MSRN information capable of performing an incoming process is received from the called party exchange after performing a PRN to the called party exchange to which the terminal device belongs. The method according to claim 1,
Wherein the first communication network is a 2G or 3G network, and the second communication network is an LTE network. The method according to claim 1,
The terminal apparatus comprises:
Wherein the terminal device is a terminal device implemented to enable voice service in an LTE network. delete Registering a terminal type and location information of a terminal device to perform call processing;
Receiving an incoming request for the terminal device located in a second communication network from a first communication network,
Checking the terminal type of the terminal apparatus when receiving the incoming request,
Checking whether the terminal device is capable of receiving a voice service in the second communication network when the terminal type of the terminal device is a terminal type capable of voice service in both the first communication network and the second communication network;
Setting an IMG routing number that can be connected to the terminal device as the call information when the second communication network is capable of receiving voice service;
Providing the call information to an exchange of the terminal device that has requested the call reception
The method comprising the steps of: 12. The method of claim 11,
And setting MSRN information capable of performing an incoming call to the terminal device as the incoming information when the second communication network can not receive the voice service
Further comprising the step of:

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