KR20120006786A - Method and apparatus for call session processing based internet protocol multimedia subsystem - Google Patents

Abstract

PURPOSE: A communication method for processing call session based on an IMS(IP Multimedia Subsystem) network and apparatus embodying the same are provided to enable a user to select a domain registered in the location of a reception terminal by searching the domain from the ENUM(tElephone NUmner Mapping) server of the IMS network. CONSTITUTION: A CSCF(Call Session Control Function) sever receives a call session request message from the calling terminal of an (IP Multimedia Subsystem) network(S61). The CSCF server requests the inquiry of an SIP(Session Initiation Protocol) address about a reception terminal to an ENUM server. The ENUM server searches the SIP address about the reception terminal(S63). The ENUM server receives a response about the inquiry request of location registration information in the reception terminal from an HSS/HLR(Home Subscriber Server/Home Location Register) server(S66, S68). The CSCF server transmits a call session request message to the reception terminal(S67, S69).

Description

Communication method for call session processing based on IMS network and apparatus implementing the same {METHOD AND APPARATUS FOR CALL SESSION PROCESSING BASED INTERNET PROTOCOL MULTIMEDIA SUBSYSTEM}

The present invention relates to a communication method and a device for processing a call session, and more particularly, between a terminal using an Internet Protocol Multimedia Subsystem (IMS) session and a terminal simultaneously supporting a CS (Circuit Switched) call and an IMS session. The present invention relates to a communication method and apparatus for processing an IMS network-based call session capable of performing location registration lookup for a called terminal in an ENUM server to efficiently support a voice service.

In 2G / 3G (Generation) network, mobility, voice service and small data service are available. Therefore, there is no limit to the ability of the existing network to meet the various service needs of users. Therefore, the introduction of an IP Multimedia Core Network Subsystem (IMS) is considered as an alternative to overcome the limitations of the existing network in view of the All IP network, that is, the 3GPP concept.

In addition, research on IMS-related standardization technologies of wired / wireless integration and 3GPP standards has been actively conducted for IMS, which provides a large-capacity data service capable of multimedia services and global roaming, and 3GPP (3rd Generation Partnership), an international standardization organization for mobile networks. Project) and 3GPP2 agreed on the standard of international roaming of all IP networks into a single network and published Harmonized IMS Model agreed between 3GPP and 3GPP2 (Common 3GPP / 3GPP2 Harmonization Reference Model: HRM).

On the other hand, LTE (Long Term Evolution), the successor to 2G GSM and 3G WCDMA networks, is a wireless internet network that is being discussed as the next generation (4G) mobile communication technology.It is suitable for wireless internet of mobile phones, laptops and netbooks as well as high speed data transmission. Do. LTE is a next-generation wireless Internet service that has the features of wide coverage, fast transmission speed, and low usage fee by supplementing the problems of existing wireless Internet service.

LTE is being combined with IMS in 3GPP (Standards Organization) to meet the demand of wireless data traffic. To this end, a signaling method for stably providing voice services and IMS-based VoIP services provided by legacy networks such as PSTN and mobile communication networks through LTE and IMS interworking is required.

The present invention is to solve the above-described problems, the present invention, when the originating terminal of the IMS network requests the IMS registration of the destination terminal and the location registration domain (domain) directly in the ENUM server when the call session request directly to the corresponding domain An object of the present invention is to provide a communication method for processing an IMS network-based call session.

Another object of the present invention is to provide a communication device capable of implementing a communication method for processing an IMS network based call session.

One embodiment of the present invention for achieving the above object comprises the steps of: receiving a call session request message from an originating terminal of an IMS network in a CSCF server; Requesting, by the CSCF server, a query for an SIP address of a TEL-URI of a called terminal included in the call session request message, to an ENUM server; The ENUM server inquires the SIP address for the TEL-URI of the called terminal, requests an inquiry of the location registration information of the called terminal to the HSS / HLR server, and sends the location registration information of the called terminal from the HSS / HLR server. Receiving a response to the inquiry request; And transmitting, by the CSCF server, the call session request message to the called terminal by using an inquiry result of the SIP address and location registration information of the TEL-URI of the called terminal transmitted from the ENUM server. It provides a communication method for call session processing.

At this time, if the SIP address for the TEL-URI of the called terminal in the ENUM server is inquired, if there is a SIP address for the TEL-URI of the called terminal, the ENUM server queries the location registration information of the called terminal. Requests to the HSS / HLR server. Further, when the SIP address for the TEL-URI of the called terminal in the ENUM server is queried, and if there is no SIP address for the TEL-URI of the called terminal, the ENUM server determines the TEL- of the called terminal. The inquiry failure response for the URK is transmitted to the CSCF server. In addition, when the called terminal is located in the CS network as a result of the inquiry of the location registration information received by the ENUM server, the ENUM server transmits an inquiry failure response for the TEL-URI of the called terminal to the CSCF server. The CSCF server transfers the call session request message including the TEL-URI of the called terminal to the called terminal. Further, when the called terminal is located in the IMS network as a result of the inquiry of the location registration information received from the ENUM server, the ENUM server sends the SIP address for the TEL-URI of the called terminal to the CSCF server and the IMS network. Pass the location registration information.

On the other hand, another embodiment according to the present invention for improving the above-described problems, the request for the inquiry of the SIP address for the TEL-URI of the called terminal from the CSCF server, the SIP for the TEL-URI of the called terminal If there is a SIP address for the TEL-URI of the called terminal as a result of the inquiry of the address, request an inquiry of the location registration information of the called terminal to the HSS / HLR server, the location of the called terminal from the HSS / HLR server Provides ENUM server of IMS network that receives inquiry result of registered information.

In this case, if the called terminal is a terminal registered in the CS network as a result of the inquiry of the location registration information of the called terminal, the ENUM server transmits an inquiry failure response for the TEL-URI of the called terminal to the CSCF server. In addition, if the called terminal is a terminal registered in the IMS network as a result of the inquiry of the location registration information of the called terminal, the ENUM server receives the SIP address for the TEL-URI of the called terminal and the location registration information of the IMS network. Deliver to the CSCF server. In addition, if the SIP address for the TEL-URI of the called terminal does not exist as a result of the inquiry of the SIP address for the TEL-URI of the called terminal, the ENUM server fails to query the TEL-URI of the called terminal. Forward the response to the CSCF server.

On the other hand, another embodiment according to the present invention for improving the above-mentioned conventional problem, in the communication device based on the IMS network including at least a CSCF server, ENUM server and HSS / HLR server, the CSCF server is the IMS network Receives a call session request message from the calling terminal of the request and requests the ENUM server to query the SIP address for the TEL-URI of the called terminal included in the call session request message, the ENUM server TEL of the requested called terminal Inquiry of SIP address for -URI, if the SIP result for TEL-URI of the called terminal exists, request inquiry of the location registration information of the called terminal to the HSS / HLR server, and the HSS Provides a communication device for the IMS network-based call session processing for receiving the query result of the location registration information of the called terminal from the / HLR server.

At this time, if the called terminal is a terminal registered in the CS network as a result of the inquiry of the location registration information of the called terminal received from the HSS / HLR server, the ENUM server fails to query the TEL-URI of the called terminal. Is transmitted to the CSCF server, and the CSCF server delivers a call session request message including the TEL-URI of the called terminal to the called terminal. In addition, if the called terminal is a terminal registered in the IMS network as a result of the inquiry of the location registration information of the called terminal received from the HSS / HLR server, the ENUM server may include a SIP address for the TEL-URI of the called terminal; The location registration information of the IMS network is transmitted to the CSCF server.

On the other hand, another embodiment according to the present invention for improving the above-mentioned conventional problems, is implemented tangibly to be implemented in a digital processing device for the communication method in the communication device based on the IMS network, A recording medium having a program recorded thereon, the method comprising: receiving a call session request message from an originating terminal of an IMS network at a CSCF server; Requesting, by the CSCF server, a query for an SIP address of a TEL-URI of a called terminal included in the call session request message, to an ENUM server; The ENUM server inquires the SIP address for the TEL-URI of the called terminal, requests an inquiry of the location registration information of the called terminal to the HSS / HLR server, and sends the location registration information of the called terminal from the HSS / HLR server. Receiving a response to the inquiry request; Transmitting, by the ENUM server, a SIP-URI or an inquiry failure response to the CSCF server according to an inquiry result of the SIP address and location registration information of the TEL-URI of the called terminal; And transmitting, by the CSCF server, the call session request message to the called terminal by using an inquiry result of the SIP address and location registration information of the TEL-URI of the called terminal transmitted from the ENUM server. Provided is a recording medium on which a program is recorded, the method comprising executing a communication method for call session processing.

According to the present invention, the ENUM server of the IMS network receiving the call session request can directly try to reach the corresponding domain by querying the registered domain of the called terminal, thereby increasing the success rate and reducing unnecessary traffic. In addition, according to the present invention, the ENUM server of the IMS network that receives the call session request, and look up the domain registered domain of the destination terminal, and attempts to directly incoming to the domain, such as VCC to the originating terminal and network node of the IMS network The location registration domain of the called terminal can be selected without applying the technology.

1 is a schematic diagram schematically showing an entire system for call session processing based on IMS network according to an embodiment of the present invention.
2 is a block diagram schematically illustrating an interworking network of an entire system for call session processing between an IMS network and a CS network according to an embodiment of the present invention.
3 is a flowchart illustrating a call session processing process in the entire system shown in FIG.
4 is a block diagram schematically illustrating an interworking network of an entire system for call session processing between IMS networks according to an embodiment of the present invention.
5 is a flowchart illustrating a call session processing process in the entire system shown in FIG.
6 is a flowchart illustrating a communication method for call session processing based on IMS network according to an embodiment of the present invention.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily practice the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Further, in order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted. In addition, the same code | symbol is attached | subjected about the similar part throughout the specification.

The present invention is based on an IMS network as a core network of fixed-mobile convergence and a wireless Internet (Long Term Evolution, LTE or WLAN) network as an access network. Implement voice services between Internet (WLAN / LTE) networks, Wireless Internet (WLAN / LTE) networks, and CS networks (Wired Telephone Network (PSTN) or Mobile Communication Network (CDMA / WCDMA)). The interworking structure and the voice service implementation method will be described with reference to the accompanying drawings.

1 is a schematic diagram schematically showing an entire system for call session processing based on IMS network according to an embodiment of the present invention. Here, the calling terminal is interworked with the IMS network through the wireless Internet (WLAN / LTE) network and thereby requests a call session to the called terminal.

Referring to FIG. 1, the entire system for call session processing based on IMS network according to the present invention has a structure in which a wireless Internet (WLAN / LTE) network is an access network and an IMS network is interworked with a core network. That is, the present invention can process a voice service according to a call session request of a calling terminal through interworking between a wireless Internet (WLAN / LTE) network and an IMS network.

The calling terminal 10 is a terminal for receiving a wireless Internet service and performs Internet access through a wireless Internet (WLAN / LTE) network 20, and the wireless Internet (WLAN / LTE) network 20 provides a wireless Internet access. Access network for providing to the terminal is composed of WLAN (Wireless LAN) or LTE. The IMS network 30 is interworked with the CS network 40 such as the PSTN and the 2G / 3G mobile communication network, and is interworked with the IP network 50. Here, the Public Service Telephone Network (PSTN) is a general fixed line telephone subscriber network, the 2G / 3G mobile communication network is a wireless network such as CDMA or WCDMA, and the IP network 50 is a service provider of another operator who is building an IMS of 3GPP / 3GPP2. Represents an IMS network.

First, in the entire system for IMS network-based call session processing according to an embodiment of the present invention as shown in FIG. 1, FIG. 2 is a diagram illustrating call session processing between the IMS network 30 and the CS network 40. And it will be described with reference to FIG.

2 is a block diagram schematically illustrating an interworking network of an entire system for call session processing between an IMS network 30 and a CS network 40 according to an embodiment of the present invention.

As shown in FIG. 2, the calling terminal 10 is interworked with the IMS network 30 via the wireless Internet (LTE or WLAN) network 20, which is an access network, and requests a call session by inputting a telephone number of the called terminal. do. The calling terminal 10 is a mobile communication terminal capable of handling SIP signaling in a wireless Internet network such as LTE and WLAN, and not only a mobile phone but also all communication devices capable of communicating through an IMS network such as a PDA. It will be apparent to those skilled in the art that this may be implemented.

In addition, the called terminal 70 is a terminal for performing a voice call using a circuit switching scheme (Circuit Switching, CS) in a wireless network of CDMA or WCDMA and the CS network 40 through the wireless network 60 of CDMA or WCDMA. It is linked with. The called terminal is a mobile communication terminal for performing a voice call using a CS network according to a circuit switched method, and all communication devices capable of performing communication through an existing CS network can be implemented in the same manner. something to do.

The IMS network 30 is a communication network based on a communication network standard proposed by 3GPP and 3GPP2. The IMS network 30 provides an IP-based communication service and mainly uses a signaling protocol such as SIP (Session Initiation Protocol). The IMS network 30 includes a CSCF server (Call Session Control Function) 31 for session control and an E.164 phone number as an information identifier in the Internet Domain Name System (DNS) to call, email, and homepage. ENUM server (tElephone NUmner Mapping, 32) which enables various communication connections such as, fax, etc., and HSS / HLR server (Home Subscriber Server / Home Location Register, 33) that manages subscriber information in all IP network. ) And BGCF / MGCF 34. Here, the BGCF (Breakout Gateway Control Function) performs a function of selecting a MGCF (Media Gateway Control Function) for interworking with the PSTN / CS network, and the MGCF serves as a gateway to the PSTN / CS network. In this case, the BGCF and MGCF may be integrated into one server or may be implemented as separate servers.

The configuration of the IMS network 30 and the function of each configuration will be described in detail. The CSCF server 31 registers a subscribed mobile terminal to the HSS / HLR server 33 and routes SIP signaling to an appropriate server. To perform. Although not shown, the CSCF server 31 may include a Proxy CSCF (P-CSCF), a Serving CSCF (S-CSCF), and an Interrogating CSCF (I-CSCF). P-CSCF performs the same function as SIP proxy server. Compression / decompression of SIP message, authentication and QoS measurement of bearer resource, SIP register request from terminal to I-CSCF Functions such as delivering. S-CSCF controls the session for the terminal and functions to maintain session state for service maintenance. The I-CSCF receives the SIP request from another network and routes it to the S-CSCF, and the address of the S-CSCF is obtained from the ENUM 12. In other words, the I-CSCF functions to forward SIP requests and responses to the S-CSCF. Such P-CSCF, S-CSCF, and I-CSCF will be apparent to those skilled in the art, and thus a detailed description thereof will be omitted.

The ENUM server 32 performs an integrated identification number system mapping function that converts telephone numbers in E.164 format into various Internet identifiers (URIs) using a Domain Name System (DNS). E.164 format phone number and internet identifier are interlocked through the system, so if you enter the E.164 format telephone number from various terminal devices (PC, PDA, VoIP phone, etc.), you can use the Internet homepage, E-Mail, Fax, It can be connected with various communication services such as mobile phones and instant messages, and when combined with VoIP, it can also perform functions for call communication and number porting service.

In addition, the ENUM server 32 performs a function of inquiring through the HSS / HLR server 33 the location registration information for the called terminal by the request of the CSCF server 31. To this end, the ENUM server 32 includes a function for requesting the inquiry of the location registration information to the HSS / HLR server 33, the HSS / HLR server 33 inquires the location registration information of the called terminal, A function for responding to the ENUM server 32 is included.

The HSS / HLR server 33 is a centralized database that manages subscriber information in the ALL IP network, developed from the home location register (HLR) of mobile communication. The user registration / change management, authentication, authorization, location, session routing, Perform the functions such as billing. As such, since the IMS network 30 will be apparent to those skilled in the art, a detailed description of the configuration will be omitted.

The HSS / HLR 41 of the CS network 40 of the called terminal performs the existing mobile subscriber management, and the MSC (Mobile telephone Switching Center, 42) is a central control unit of the mobile communication network and controls the wireless link and the wired link. A mobile terminal and a fixed telephone network (mobile phone base station) or a role of connecting to other communication networks and manages mobile subscribers in conjunction with the HSS / HLR (41).

3 is a flowchart illustrating a call session processing procedure in the system shown in FIG. As shown in FIG. 3, the calling terminal 10 is interworked with the IMS network 30 via the wireless Internet (LTE / WLAN) network 20 and connected to the CSCF server 31 of the IMS network 30. The call session request message is transmitted using the TEL-URI. Here, the TEL-URI of the called terminal uses a telephone number in the form of a URI.

Then, the calling CSCF server 31 receiving the call session request message from the calling terminal 10 (that is, INVITE including the TEL-URL of the called terminal) sends an ENUM to the TEL-URI to find the location of the called terminal. The server 32 transmits an IP (Internet Protocol) address corresponding to the TEL-URL of the called terminal and the location registration information of the called terminal to the ENUM server 32 (ENUM query).

Accordingly, the ENUM server 32 inquires the SIP-URI for the TEL-URI of the called terminal, and if there is a SIP-URI for the TEL-URI of the called terminal (Yes), that is, the called terminal is registered in the IMS. In the case of the terminal, the HSS / HLR server 33 requests (HSS / HLR query) the inquiry of the location registration information on the destination of the called terminal.

Then, the HSS / HLR 33 inquires the location registration information about the destination of the called terminal, and delivers the result to the ENUM server 32 (RETRUN). That is, as shown in FIG. 2, since the called terminal 70 is linked with the CS network 40 through the mobile communication network 60 such as CDMA or WCDMA, the HSS / HLR server 33 is connected to the CS network 40. The location registration information of the called terminal 70 whose location is registered at is inquired from the HSS / HLR 41, and the location registration information of the called terminal 70 is transferred to the ENUM server 32.

Therefore, the ENUM server 32 checks the location registration information of the called terminal received from the HSS / HLR server 33, and if the called terminal is located in the CS network 40, the inquiry failure response to the called terminal is returned. It sends to the calling CSCF server 31 (RETRUN URI).

Then, the calling CSCF server 31 receives the inquiry failure response from the ENUM server 32 to the CS network 40 by the called terminal 70, and maintains the TEL-URI of the called terminal so that the BGCF / MGCF 34 The service request message to the CS network 40 is transmitted to the CS network 40 (INVITE (TEL-URI)), and the BGCF / MGCF 34 converts the service request message (INVITE (TEL-URI)) into an IAM (Initial Address Message) message type. After converting the data to the destination MSC server (Mobile Switching Center, 42).

Accordingly, the called MSC server 42 delivers a setup message to request the call terminal 70 to set up a voice call, and the called terminal 70 sends an answer message containing information on call initiation. The MSC server 42 forwards the response message to the BGCF / MGCF 34 (ACM). Then, the BGCF / MGCF 34 delivers the response message to the calling CSCF server 31 and the calling CSCF server 31 delivers it to the calling terminal 10. As a result, a signaling session is established between the calling terminal 10 and the called terminal 70 and actual voice communication is performed.

On the other hand, when the SIP-URI for the TEL-URI of the called terminal 70 in the ENUM server 32, the SIP-URI for the TEL-URI of the called terminal 70 does not exist (No), that is, the incoming If the terminal 70 is not a terminal registered in the IMS, the ENUM server 32 returns an inquiry failure response to the calling CSCF server 31. Then, the calling CSCF server 31 requests the call to the CS network 40 using the TEL-URI for the called terminal 70.

Next, in the entire system for IMS network-based call session processing according to an embodiment of the present invention as shown in FIG. 1, call session processing between IMS networks will be described with reference to FIGS. 4 and 5. do.

4 is a block diagram schematically illustrating an interworking network of an entire system for call session processing between IMS networks according to an embodiment of the present invention. Here, the same components as those of the systems shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the same description is omitted.

As shown in FIG. 4, the calling terminal 10 is interworked with the IMS network 30 through the wireless Internet (LTE or WLAN) network 20, which is an access network, and requests a call session by inputting a telephone number of the called terminal. do. The receiving terminal 70 'is interworked with an IP network, that is, an IMS network 50 of another operator, using a wireless Internet network 60' such as LTE or WLAN as an access network.

The calling terminal 10 and the called terminal 70 'are mobile communication terminals capable of handling SIP signaling in a wireless Internet network such as LTE and WLAN, and can communicate not only a mobile phone but also an IMS network such as a PDA. It will be apparent to those skilled in the art that all communication devices present may be implemented identically.

In addition, the calling IMS network 30 receives a CSCF server (Call Session Control Function) 31 for session control and an E.164 phone number as an information identifier in the Internet Domain Name System (DNS) to receive a call, ENUM server (tElephone NUmner Mapping, 32) that enables various communication connections such as e-mail, homepage, and fax with one number, and HSS / HLR server that manages subscriber information in all IP networks (Home Subscriber Server / Home Location). Register, 33) at least.

Here, the CSCF server 31, the ENUM server 32, and the HSS / HLR server 33 of the calling IMS network 30 are the same as the CSCF server, the ENUM server, and the HSS / HLR server of the IMS network shown in FIG. Detailed description is omitted since it is a configuration. In addition, since the calling party IMS network 30 and the called party IMS network 50 described in FIGS. 2 and 4 have the same configuration, detailed description of the called party IMS network 50 is also omitted.

FIG. 5 is a flowchart illustrating a call session processing process between IMS networks 30 and 50 in the entire system shown in FIG. 4. Referring to FIG. 5, the calling terminal 10 is interworked with the IMS network 30 through the wireless Internet (LTE / WLAN) network 20 and is a TEL-URI as the CSCF server 31 of the calling IMS network 30. Send a call session request message using.

Then, the calling CSCF server 31 receiving the call session request message from the calling terminal 10 (that is, INVITE including the TEL-URL of the called terminal) sends an ENUM to the TEL-URI to find the location of the called terminal. The server 32 transmits an IP (Internet Protocol) address corresponding to the TEL-URL of the called terminal and the location registration information of the called terminal to the ENUM server 32 (ENUM query).

Accordingly, the ENUM server 32 inquires the SIP-URI for the TEL-URI of the called terminal, and if there is a SIP-URI for the TEL-URI of the called terminal (Yes), that is, the called terminal is registered in the IMS. In the case of the terminal, the HSS / HLR server 33 requests (HSS query) an inquiry of the location registration information on the destination of the called terminal.

Then, the HSS / HLR server 33 inquires the location registration information for the destination of the called terminal, and delivers the result to the ENUM server 32 (RETRUN). That is, since the called terminal 70 'is linked with the IMS network 50 through the wireless Internet network 60', as shown in FIG. 4, the HSS / HLR server 33 is connected to the called terminal 70 '. The location registration information inquiry confirms that the location is registered in the IMS network 50, and transmits the inquiry result to the ENUM server 32.

Accordingly, the ENUM server 32 confirms that the called terminal is a terminal registered in the IMS network through the location registration information received from the HSS / HLR server 33, and sends the retrieved SIP-URI information to the calling CSCF server 31. (RETRUN URI). The calling CSCF server 31 then forwards the call session request message (INVITE (SIP-URI)) to the called CSCF server 52 using the SIP-URI for the TEL-URI of the called terminal.

Accordingly, the called party CSCF server 52 forwards the call session request message (INVITE (SIP-URI)) to the called terminal 70 ', and the called terminal 70' responds to the call session request message 200 OK) is sent to the called party's CSCF server 52. The destination CSCF server 52 forwards a response message 200 OK to the calling CSCF server 31, and the calling CSCF server 31 sends a response message 200 to the calling terminal 10 to the call session request message. OK), thereby establishing a signaling session to communicate.

On the other hand, when the SIP-URI for the TEL-URI of the called terminal 70 'is inquired by the ENUM server 32, if the SIP-URI for the TEL-URI of the called terminal 70' does not exist (No), that is, If the called terminal 70 'is not a terminal registered with the IMS, the ENUM server 32 sends an inquiry failure response to the calling CSCF server 31. Then, the calling CSCF server 31 requests the call to the CS network 40 using the TEL-URI for the called terminal 70 'as before.

6 is a flowchart illustrating a communication method for call session processing based on IMS network according to an embodiment of the present invention. Here, the communication method for call session processing based on IMS network may be implemented using the system shown in FIGS. 1 to 5.

As shown in FIG. 6, when the calling CSCF server receives the call session request message from the calling terminal of the IMS network (S61), the calling CSCF server is connected to the TEL-URI of the called terminal included in the call session request message. Request the inquiry of the SIP address to the originating ENUM server (S62).

Then, the originating ENUM server receives a request of the SIP-URI for the TEL-URI of the called terminal from the calling CSCF server, and inquires the SIP address of the TEL-URI of the called terminal (S63). That is, the calling ENUM server checks whether the called terminal is a terminal registered in the IMS through an inquiry of the SIP-URI for the TEL-URI of the called terminal.

Subsequently, if the SIP address query result (S64) of the calling party ENUM server is present, the SIP-URI for the TEL-URI of the called party exists (S64, YES), that is, if the called terminal is a terminal registered in the IMS, the calling party ENUM The server requests the originating HSS / HLR server to query the location registration information for the destination of the called terminal (S65).

Then, the originating HSS / HLR server performs location registration information inquiry on the destination of the called terminal, and transmits the inquiry result to the calling ENUM server in response.

Subsequently, the originating ENUM server receives a response from the originating HSS / HLR server to the inquiry request for the location registration information of the called terminal. And, the originating ENUM server checks the location registration information of the called terminal from the location registration information of the called terminal received from the HSS / HLR, and corresponds to the TEL-URI of the called terminal when the called terminal is registered in the IMS network. The SIP-URI is transmitted to the calling CSCF server (S66). Then, the calling CSCF server transfers the call session request message including the SIP-URI to the CSCF server of the called IMS network to induce an incoming call to the called terminal (S67).

On the other hand, the originating ENUM server checks the location registration information of the called terminal from the location registration information of the called terminal received from the calling HSS / HLR, and when the called terminal is located in the CS network, the TEL- of the called terminal is registered. The query failure response for the URI is transmitted to the CSCF server (S68). Then, the calling CSCF server sends a call session request message including the TEL-URI to the MCS server of the called CS network to induce an incoming call to the called terminal (S69).

On the other hand, if there is no SIP-URI for the TEL-URI of the called terminal (S64, No), the originating ENUM server sends an inquiry failure response to the TEL-URI of the called terminal. It transmits to the CSCF server, and transmits the call session request message including the TEL-URI from the calling CSCF server to the MCS server of the called CS network to induce an incoming call to the called terminal (S70).

So far I looked at the center of the preferred embodiment for the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown not in the above description but in the claims, and all differences within the scope should be construed as being included in the present invention.

In addition, the recording medium in which the program is tangibly embodied to be executed in the digital processing device for the communication method in the IMS network-based communication device according to the present invention, the program can be read by the digital processing device, Receiving a call session request message from an originating terminal of an IMS network in a CSCF server, and requesting an inquiry from the CSCF server of an SIP address for a TEL-URI of a called terminal included in the call session request message to an ENUM server; And, the ENUM server inquires the SIP address for the TEL-URI of the called terminal, requests the inquiry of the location registration information of the called terminal to the HSS server, and requests the inquiry of the location registration information of the called terminal from the HSS server Receiving a response to, and querying the SIP address and location registration information for the TEL-URI of the called terminal in the ENUM server Transmitting a SIP-URI or sending an inquiry failure response to the CSCF server, and using the inquiry result of the SIP address and location registration information of the TEL-URI of the called terminal transmitted from the ENUM server in the CSCF server. Implementing as a computer-readable code on a recording medium having a program recorded thereon, the method comprising performing a communication method for processing an IMS network-based call session, comprising transmitting the call session request message to the called terminal. It is possible.

A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

10: calling terminal 20: wireless Internet (WLAN / LTE) network
30: IMS network 31: calling CSCF server
32: source ENUM server 33: source HSS / HLR server
34: originating BGCF / MGCF server 40: CS network
41: called-side HSS / HLR server 42: called-side MSC server
50: IP network 51: called party HSS / HLR server
52: called party CSCF server 60, 60 ': called party access network
70, 70 ': called terminal

Claims (13)

Receiving a call session request message from an originating terminal of an IMS network in a CSCF server;
Requesting, by the CSCF server, a query for an SIP address of a TEL-URI of a called terminal included in the call session request message, to an ENUM server;
The ENUM server inquires the SIP address for the TEL-URI of the called terminal, requests an inquiry of the location registration information of the called terminal to the HSS / HLR server, and sends the location registration information of the called terminal from the HSS / HLR server. Receiving a response to the inquiry request; And
Transmitting, by the CSCF server, the call session request message to the called terminal by using an inquiry result of the SIP address and location registration information of the TEL-URI of the called terminal transmitted from the ENUM server; Communication method for call session processing.
The method of claim 1,
When the SIP address for the TEL-URI of the called terminal exists in the ENUM server, if there is a SIP address for the TEL-URI of the called terminal, the ENUM server requests the location registration information inquiry of the called terminal. Communication method for IMS network based call session processing, characterized in that the request to the HSS / HLR server.
The method of claim 2,
When the SIP address for the TEL-URI of the called terminal does not exist in the ENUM server, if the SIP address for the TEL-URI of the called terminal does not exist, the ENUM server is assigned to the TEL-URK of the called terminal. A communication method for processing a call session based on an IMS network, comprising: transmitting a query failure response to the CSCF server.
The method according to claim 1 or 2,
When the called terminal is located in the CS network as a result of the inquiry of the location registration information received from the ENUM server,
The ENUM server sends an inquiry failure response for the TEL-URI of the called terminal to the CSCF server,
And transmitting a call session request message including a TEL-URI of the called terminal from the CSCF server to the called terminal.
The method of claim 4, wherein
As a result of the inquiry of the location registration information received from the ENUM server, when the called terminal is registered in the IMS network, the ENUM server sends a SIP address for the TEL-URI of the called terminal and the location of the IMS network to the CSCF server. A communication method for processing a call session based on an IMS network, comprising transmitting registration information.
If a request for a SIP address for a TEL-URI of a called terminal is requested from a CSCF server, and a SIP address for a TEL-URI of the called terminal is found, a SIP address for a TEL-URI of the called terminal exists. ENUM server of the IMS network for requesting the inquiry of the location registration information of the called terminal to the HSS / HLR server, and receives the query result of the location registration information of the called terminal from the HSS / HLR server.
The method of claim 6,
As a result of the inquiry of the location registration information of the called terminal, if the called terminal is a terminal registered in the CS network, the ENUM server transmits an inquiry failure response for the TEL-URI of the called terminal to a CSCF server. ENUM server on the IMS network.
The method according to claim 6 or 7,
If the called terminal is a terminal registered in the IMS network as a result of the inquiry of the location registration information of the called terminal, the ENUM server sends the SIP address of the TEL-URI of the called terminal and the location registration information of the IMS network to the CSCF. ENUM server of the IMS network, characterized in that forwarded to the server.
The method of claim 6,
If the SIP address for the TEL-URI of the called terminal does not exist as a result of the inquiry of the SIP address for the TEL-URI of the called terminal, the ENUM server returns an inquiry failure response for the TEL-URI of the called terminal. ENUM server of the IMS network, characterized in that for transmitting to the CSCF server.
An IMS network based communication device including at least a CSCF server, an ENUM server, and an HSS / HLR server,
The CSCF server receives a call session request message from the originating terminal of the IMS network and requests the ENUM server to query the SIP address for the TEL-URI of the called terminal included in the call session request message.
The ENUM server queries the SIP address for the TEL-URI of the requested called terminal, and if the SIP address for the TEL-URI of the called terminal exists as a result of the inquiry, the ENUM server sends a message to the HSS / HLR server. And requesting the inquiry of the location registration information, and receiving the inquiry result of the location registration information of the called terminal from the HSS / HLR server.
The method of claim 10,
As a result of the inquiry of the location registration information of the called terminal received from the HSS / HLR server, if the called terminal is a terminal registered in the CS network,
The ENUM server transmits the inquiry failure response for the TEL-URI of the called terminal to the CSCF server,
And the CSCF server delivers a call session request message including the TEL-URI of the called terminal to the called terminal.
The method according to claim 10 or 11, wherein
As a result of the inquiry of the location registration information of the called terminal received from the HSS / HLR server, if the called terminal is a terminal registered in the IMS network,
And the ENUM server transmits the SIP address of the TEL-URI of the called terminal and the location registration information of the IMS network to the CSCF server.
In the recording medium in which the program is tangibly embodied so as to be executed in a digital processing device for a communication method in an IMS network-based communication device, the program can be read by the digital processing device.
Receiving a call session request message from an originating terminal of an IMS network in a CSCF server;
Requesting, by the CSCF server, a query for an SIP address of a TEL-URI of a called terminal included in the call session request message, to an ENUM server;
The ENUM server inquires the SIP address for the TEL-URI of the called terminal, requests an inquiry of the location registration information of the called terminal to the HSS / HLR server, and sends the location registration information of the called terminal from the HSS / HLR server. Receiving a response to the inquiry request;
Transmitting, by the ENUM server, a SIP-URI or an inquiry failure response to the CSCF server according to an inquiry result of the SIP address and location registration information of the TEL-URI of the called terminal; And
Transmitting, by the CSCF server, the call session request message to the called terminal by using an inquiry result of the SIP address and location registration information of the TEL-URI of the called terminal transmitted from the ENUM server; A recording medium having a program recorded thereon, the method comprising performing a communication method for call session processing.

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