KR100996568B1 - Apparatus and method for processing routing in IMS - Google Patents

Abstract

The present invention relates to an apparatus and method for routing processing in an IMS network, and more particularly, to an apparatus and method for routing processing in an IMS network capable of maintaining information on all calls between its own network and a third party network. It is about.

An apparatus for routing processing in an IMS network according to an embodiment of the present invention includes a determination unit that determines whether a call is entered into a session control device, and when the call is received into the session control device as a result of the determination, the call is received. And a setting unit configured to analyze the included routing information and to set routing information of the session control device in the routing information, and a transfer unit configured to transfer a call including the set routing information to the session control device.

IMS, SCIM, CSCF

Description

Apparatus and method for processing routing in IMS}

The present invention relates to an apparatus and method for routing processing in an IMS network, and more particularly, to an apparatus and method for routing processing in an IMS network capable of maintaining information on all calls between its own network and a third party network. It is about.

Recently, there are not only circuit switching based communication networks such as CDMA (Code Division Multiple Access) networks, but also packet switching based communication networks. Especially, IP (Internet Protocol) based communication is used. The performing IP Multimedia Subsystem (IMS) network is used.

The IMS network conforms to the communication network standard proposed by the 3rd Generation Partnership Project (3GPP), and provides an IP-based communication service, and mainly uses a signaling protocol such as a Session Initiation Protocol (SIP).

In 3GPP, the subdomain method uses a Domain Name Service (DNS) query to send a call to a Service Capability Interaction Manager (SCIM) through an Interrogating CSCF (I-CSCF), or a call sent from a SCIM. In I-CSCF, it may be interworked with other IMS networks by PSI (Public Service ID).

On the other hand, in the IMS network, when a call is transmitted between devices, the device via the call includes routing information in the call. However, since I-CSCF does not perform session management function, it does not include its routing information.

In this case, the routing information of the I-CSCF is included when the network of the first party and the third party are interworked, for example, when a call originating from the AS (Application Server) of the first party is transferred to the third party via the SCM and I-CSCF. Since the other party's network responds to the call originating from the AS of its own network, the call is sent directly to SCIM without passing through I-CSCF and forwarded to the AS.

Therefore, when the interworking network of the first company and the third party network does not pass through the I-CSCF, the I-CSCF does not maintain information on all calls, and thus there is a problem in that an abnormally processed call is difficult to process.

The technical problem to be achieved by the present invention is to perform routing processing in the IMS network which allows the session control device to set the routing information of the session control device as a default so that the session control device can maintain all the information about the call transmitted between the company network and the third party network. To provide an apparatus and method for the same.

The object of the present invention is not limited to the above-mentioned object, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

An apparatus for routing processing in an IMS network according to an embodiment of the present invention for achieving the above object, the determination unit for determining whether the call to the session control device, the call is entered into the session control device as a result of the determination In the case, the routing information included in the incoming call is analyzed, and the setting unit for setting the routing information of the session control device in the routing information, and the transfer to deliver the call containing the set routing information to the session control device. Contains wealth.

In addition, the method for the routing processing in the IMS network according to an embodiment of the present invention for achieving the above object, determining whether the call incoming to the session control device, the call entering the session control device as a result of the determination Analyzing the routing information included in the incoming call, setting routing information of the session control device in the routing information, and transmitting a call including the set routing information to the session control device. Steps.

Specific details of other embodiments are included in the detailed description and drawings which will be described later.

According to the apparatus and method for routing processing in the IMS network according to the embodiment of the present invention as described above, one or more of the following effects exist.

In case of interworking of own network and third party network through sub domain PSI method, SCIM sets routing information of session control device as default, and session control device maintains information about all calls transferred between own network and third party network. There is an effect that can prevent the occurrence of abnormal call processing.

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

Hereinafter, with reference to the drawings for the configuration and processing flowchart for explaining the apparatus and method for routing processing in the IMS network according to embodiments of the present invention will be described in detail for the implementation of the present invention.

At this time, it is to be understood that like reference numerals refer to like elements throughout the specification, and that each configuration of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions.

Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in the flowchart configuration (s). It creates a means to perform the functions.

These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart configuration (s).

Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart configuration (s).

In addition, each configuration may represent a module, segment or portion of code that includes one or more executable instructions for executing a specified logical function (s).

It should also be noted that in some alternative embodiments, the functions noted in the configurations may occur out of order. For example, the two components shown in succession may in fact be performed substantially simultaneously or the components may sometimes be performed in the reverse order, depending on the function in question.

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

1 is a block diagram illustrating a system for call processing in an IMS network according to an embodiment of the present invention.

As shown, the system 100 for call processing in an IMS network according to an embodiment of the present invention may include a subscriber station 110, an IP Multimedia Subsystem (IMS) network 120, and an access network 130. Can be.

The IMS network 120 is a concept defined in the 3rd Generation Partnership Project (3GPP) that defines Global System for Mobile communication (GSM) and Wideband Code Division Multiple Access (WCDMA), and provides IP-based communication-based services. Mostly, signaling protocols such as Session Initiation Protocol (SIP) are used. In addition, in 3GPP2, which defines a code division multiple access (CDMA) or the like, a function similar to that of the IMS network 120 is defined as a multimedia domain (MMD). Hereinafter, the IMS network 120 will be described as an example in the embodiment of the present invention, but it can be seen that MMD can be similarly applied.

The access network 130 is a communication network that allows the subscriber station 110 to access the IMS network 120, for example, a mobile communication network such as CDMA, WCDMA and GSM, a public switched telephone network (PSTN), and integrated services (ISDN). It may include a wired communication network such as Digital Network) or other known communication network. Of course, in the embodiment of the present invention, the IMS network 120 and the access network 130 is described as being configured separately, but this is only an example to help the understanding of the present invention is not limited to this IMS network 120 ) And the access network 130 may be configured as one communication network.

The IMS network 120 includes a call session control function 122 (CSCF) and a location register for session control according to a gateway 121 (G / W), a call, etc. connected to the access network 130. A home subscriber server (HSS) 123, an application server 124 (AS), and a media resource function 125 (MRF). At this time, in the embodiment of the present invention, the CSCF 122 is used as the session control device, but this is only an example for clarity of understanding of the present invention, and the present invention is not limited thereto. The same can be implemented.

CSCF 122 may perform the function of registering subscriber terminal 110 with HSS 123 and routing SIP signaling to the appropriate server. Since the CSCF 122 performs different functions depending on the network in which the subscriber station 110 is located, the Proxy CSCF 122a (P-CSCF) and Serving CSCF 122b (S-CSCF) are based on the location and role. And Interrogating CSCF 122c (I-CSCF).

The P-CSCF 122a is the first point where the subscriber station 110 connects to the IMS network 120 and is present in the same domain as the Gateway GPRS Support Node (GGSN). The P-CSCF 121a performs the same function as the SIP proxy server, and compresses / decompresses SIP messages, authenticates bearer resources and measures QoS, and requests SIP registers from the terminal to the I-CSCF 122c. It can perform the function of delivering. The S-CSCF 122b controls the session for the terminal and may maintain the session state for service maintenance.

The I-CSCF 122c may serve as a contact point for an incoming call to connect to a subscriber station in the network and a contact point with a terminal of a third party network subscriber roaming in the network. I-CSCF 122c receives the SIP request from another network and routes it to S-CSCF 122b, and the address of S-CSCF 122b can be obtained from HSS 123. That is, I-CSCF 122c may forward the SIP request and response to S-CSCF 122b.

The AS 124 is connected to the CSCF 122 through the SCIM (Service Capability Interaction Manager) 124a, and provides a video conference call service, video conference call based technology, video conference call media control, intelligent network prepaid billing processing, and billing information. It can provide application functions such as transmission, voice control function when performing Push-To-Talk (PTT) function, announcement broadcasting, ring-back-tone function, and Voice over Internet Protocol (VoIP) service. Of course, in one embodiment of the present invention has been described for the case in which one AS 124 is used as an example, this is only one example to help the understanding of the present invention, not limited to this, all in one AS An application function may be performed, and a plurality of ASs may provide an application function according to each function. In this case, the SCIM 124a has been described as an example that is configured separately from the AS 124, but this is merely an example to help the understanding of the present invention, and the present invention is not limited thereto. It may also be configured to integrate with 124).

The MRF 125 performs a function of controlling a media stream resource, and may include a multimedia resource function controller (MRFC) and a multimedia resource function processor (MRFP). The MRFP mixes and processes media streams, and the MRFC can control media stream resources within the MRFP.

On the other hand, in 3GPP subdomain (PSI) public service ID (PSI) method is a call is transferred to the SCIM (124a) through the I-CSCF (122c) using a Domain Name Server (DNS) Query, or SCIM ( The call transmitted from 124a may be interworked with a third party network (eg, a third party's IMS network) in the I-CSCF 122c in a Public Service ID (PSI) manner. At this time, when the own network and the third party network interwork with the sub-domain PSI method, when the call originated from the AS 124 of the own network is transferred to the third party network through the SCM 124a and the I-CSCF 122c, I- Since the routing information of the CSCF 122c is not included, the call originated by the third party network in response to the call originating from the AS 124 of the own network is directly transmitted to the SCIM 124a without passing through the I-CSCF 122c. To the AS 124.

Accordingly, the present invention is to allow the CSCF 122, specifically I-CSCF (122c) to maintain information about all calls when the network and the third party network interworking through the sub-domain PSI method, the present invention As shown in FIG. 2, the apparatus 200 for routing processing in the IMS network according to an embodiment of the present invention may include a determination unit 210 that determines whether a call is introduced into the session control apparatus, and as a result, the session control apparatus. When the call of incoming call is received, it analyzes the routing information included in the incoming call to the session control device, and sets the routing information of the session control device to the analyzed routing information and the call including the set routing information. It may include a delivery unit 230 for transmitting to the session control device.

In the embodiment of the present invention, since the I-CSCF 122c does not set its own routing information for the call transmitted from the SCIM 124a, it cannot maintain all the information about the call transmitted between its own network and the third party network. In order to prevent call processing from occurring, when routing information is set in SCIM 124a, routing information of I-CSCF 122c is set as a default. Therefore, routing processing in an IMS network according to an embodiment of the present invention is performed. The case where the device 200 is included in the SCIM 124a will be described by way of example. Of course, in the embodiment of the present invention that the apparatus 200 for routing processing in the IMS network is included in the SCIM (124a) is just an example to help understanding of the present invention, it is configured separately or included in other components It may be, but is not limited thereto. In addition, since an embodiment of the present invention relates to call forwarding between a company network and a third party network, the above-described session control apparatus will be described with an example of an I-CSCF 122c.

The determination unit 210 enters the call to the I-CSCF 122c from the AS 124 when the call originated from the AS 124 is transferred to the third party network through the CSCF 122, that is, the I-CSCF 122c. It can be determined. In this case, the call originating from the AS 124 may include routing information of the AS 124. For example, the call originating from the AS 124 may include routing information such as "Record-route: as.ktfims.com".

The setting unit 220 analyzes the routing information included in the call originating from the AS 124 and sets the routing information before transferring the call originating from the AS 124 to the I-CSCF 122c. In the embodiment of the present invention, since the apparatus 200 for routing processing in the IMS network has been described as an example included in the SCIM 124a, the setting unit 220 first includes routing information of the SCIM 124a, For example, routing information such as "Record-route: scim.ktfims.com" can be set.

At this time, the setting unit 220 defaults to I to prevent abnormal call processing that occurs because the I-CSCF 122c does not set its routing information after the DNS query and transfers the incoming call to a third party network as it is. The routing information of the CSCF 122c is set together with the routing information of the SCIM 124a. Therefore, the setting unit 220 sets up "Record-route: icscf.ktfims.com" which is routing information of the I-CSCF 122c together with "Record-route: as.ktfims.com".

As described above, when the setting unit 220 sets the routing information of the SCIM 124a and the routing information of the I-CSCF 122c together, when a call is received from a third-party network, the setting call 220 receives the I-CSCF 122c. Since the routing information is included, the call can be delivered to the company network through the I-CSCF 122c. Therefore, since all information on the call transmitted between the own network and the third party network can be maintained, abnormal call processing can be prevented from occurring in advance. That is, since the incoming call from the third party network is delivered in the reverse order with respect to the routing information included in the call transferred from the own network to the third party network, the routing information of the I-CSCF 122c is added to the routing information of the call delivered to the third party network. If it is included, the call is also passed through the I-CSCF (122c) to be introduced into the company's network.

The transfer unit 230 transmits the call with the routing information set by the setting unit 220 to the I-CSCF 122c, and the I-CSCF 122c transfers the call to the third party network after the DNS query.

On the other hand, when a call is introduced from a third party network to the own network in response to a call transferred from the own network to the third party network, the incoming call from the third party network includes routing information of the I-CSCF 122c. May be passed to the CSCF 122c. At this time, the I-CSCF 122c deletes its routing information from the routing information of the call transferred to the other company's network, and then transfers the call to its own network.

3 is a block diagram showing the configuration of a session management apparatus according to an embodiment of the present invention. In this case, as described above, since the I-CSCF 122c deletes its routing information from the routing information of the call transmitted to the third party network and then transfers it to the own network, FIG. The session management apparatus will be described using the I-CSCF 122c as an example, and the same reference numerals as the I-CSCF 122c will be used.

As shown, the session management device 122c according to an embodiment of the present invention receives the routing information of the session control device 300 according to the analysis unit 310 and the analysis result analyzing the routing information of the incoming call from the third party network. Delete, and may include a delivery unit 320 for transferring the incoming call from the other company's network.

When the analysis unit 310 transmits the call to the third party network because the routing information of the session control apparatus 122c is set by default by the setting unit 220 of FIG. Once forwarded to device 122c, routing information of the forwarded call can be analyzed.

The transfer unit 320 may delete the routing information of itself, that is, the session control device 122c according to the analysis result, and transfer the call received from the third party network to the own network.

4 is a flowchart illustrating a method for processing a call route transmitted from a company network to a third party network according to an exemplary embodiment of the present invention.

As shown, when a call is originated from the AS 124 (S110), the SCIM 124a sets routing information of the SCIM 124a and routing information of the I-CSCF 122c in the routing information of the originated call (S120). In step S130, the call including the set routing information is transmitted to the I-CSCF 122c. At this time, in the embodiment of the present invention, a case where the call originated from the AS 124 is a "SUBSCRIBE" message will be described as an example. In addition, when a call originates from the AS 124, the call is included including routing information of the AS 124. Therefore, the routing information of the call transferred to the I-CSCF 122c includes the routing information of the AS 124, the SCIM 124a, and the I-CSCF 122c.

I-CSCF 122c forwards the DNS query to DNS 400 (S140), and receives a DNS response to the forwarded DNS query from DNS 400 (S150).

Thereafter, the I-CSCF 122c transfers the call to the third party network 500 according to the received DNS response (S160).

5 is a flowchart illustrating a method for processing routing of a call transmitted from a third party network to the own network according to an embodiment of the present invention. In addition, in FIG. 5, a case where a call transmitted from a third party network to the company network is a "NOTIFY" message for the "SUBSCRIBE" message transmitted in FIG. 4 will be described as an example.

As shown, when a call transferred from the third party network 500 is introduced into the I-CSCF 122c (S210), the I-CSCF 122c analyzes and analyzes routing information of the call introduced from the third party network 500. The routing information of the I-CSCF 122c is deleted from the received routing information (S220), and transferred to the SCIM 124a (S230).

SCIM 124a transfers the call transferred from I-CSCF 122c to AS 124 (S240). In this case, in FIG. 5, only the I-CSCF 122c deletes its own routing information. However, when the SCIM 124a also forwards the call to the AS 124, the I-CSCF 122c undergoes a process of deleting its own routing information. .

6 and 7 are schematic diagrams showing the routing information in FIG. 4 described above.

6 is routing information included in a call originating from the AS 124 and includes only the routing information 610 of the AS 124. When the call is forwarded from the AS 124 to the SCIM 124a, the SCIM 124a receives the routing information 630 of the I-CSCF 122c as well as the router information 620 of the SCIM 124a, as shown in FIG. It will be set by default. Accordingly, the routing information included in the call transmitted from the I-CSCF 122c to the third party network 500 may include routing information 610 of the AS 124 and routing information of the SCIM 124a as shown in FIG. 7. Both the 620 and the routing information 630 of the I-CSCF 122c may be included.

8 to 10 are schematic diagrams illustrating the routing information in FIG. 5 described above.

8 is routing information included in a call coming from a third party network 500, and includes routing information 610, 620, and 630 of the AS 124, the SCIM 124a, and the I-CSCF 122c. In this case, it can be seen that FIG. 8 is reversed from the above-described FIG. 7.

The I-CSCF 122c deletes its routing information 630 from the routing information included in the incoming call from the third party network 550, and then transfers the routing information as shown in FIG. 9 to the SCIM 124a. It can be seen that the routing information of FIG. 9 includes routing information 610 and 620 of the AS 124 and the SCIM 124a by deleting the routing information of the I-CSCF 122c.

Since the SCIM 124a deletes and transmits its routing information before passing the call to the AS 124, as shown in FIG. 10, the routing information included in the call transferred to the AS 124 is transferred to the AS 124. It can be seen that only routing information 610 is included.

As described above, the routing processing method in the IMS network according to the embodiment of the present invention, in the sub-domain PSI scheme, transmits the call to the third party network through the I-CSCF 122c to the CSCF 122 instead of the called number. Since it is a registered PSI, I-CSCF defaults to abnormal call processing caused by I-CSCF 122c forwarding a call to a third party network without adding its own routing information after DNS query. It is possible to prevent by adding the routing information of 122c.

On the other hand, in the embodiment of the present invention as described above, when sending the "SUBSCRIBE" message in the company's network, SCIM (124a) by setting the routing information of the I-CSCF (122c) by default to the third party network, For example, when the "NOTIFY" message from the network is introduced into the own network, it is described as an example of passing it to the own network through the I-CSCF 122c. However, the present invention is not limited thereto. When delivered, it can be similarly applied to forwarding a "NOTIFY" message from its own network to a third party network, and can also be applied to other SIP messages such as "INVITE" message.

For example, as shown in FIG. 11, when a call is introduced into the I-CSCF 122c for delivery from the third party network 500 to the AS 124 (S310), the incoming call is an I-CSCF 122 c. And it is delivered to the AS 124 via the SCIM (124a) (S320, S330).

At this time, if the routing information included in the call introduced into the third-party network 500 is "Record-route: aaa.co.kr", the routing information included in the call transferred to the AS 124 is the third-party network 500 , All of routing information of the I-CSCF 122c and the SCIM 124a is included. That is, the routing information of the call delivered to the AS 124 includes "Record-route: aaa.co.kr", "Record-route: icscf.ktfims.com", and "Record-route: scim.ktfims.com". It can be. At this time, the routing information of the I-CSCF 122c may be set to SCIM 124a by default. In FIG. 4 described above, if the SCIM 124a defaults to routing information of the I-CSCF 122c for a call originating from the own network, FIG. 11 shows that the SCIM 124a is connected to a call coming to the own network. It can be understood that the routing information of the I-CSCF 122c is set to default.

The AS 124 refers to routing information included in the call transmitted from the third party network 500 and transmits a "NOTIFY" message thereto (S340), and the call sent from the AS 124 is sent to the SCIM 124a and It is delivered to the third party network 500 via the I-CSCF (122c) (S350, S360).

11 illustrates a case in which the SCIM 124a sets routing information of the I-CSCF 122c with respect to a call coming from the third-party network 500, but is not limited thereto. The CSCF 122c may set its own routing information.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1 is a block diagram illustrating a system for call processing in an IMS network in an embodiment of the present invention.

2 is a block diagram showing an apparatus for routing processing in an IMS network according to an embodiment of the present invention.

3 is a block diagram showing a session control apparatus according to an embodiment of the present invention.

4 is a flowchart illustrating a method for processing a call routing from a corporate network to a third party network according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating a routing processing method of a call transferred from a third party network to the own network with respect to the call transferred in FIG. 4.

6 and 7 are schematic diagrams showing routing information of a call transmitted from a company network to a third party network according to an embodiment of the present invention.

8 and 10 are schematic diagrams showing routing information of a call transferred from a third party network to the own network according to an embodiment of the present invention.

11 is a flowchart illustrating a routing processing method for a call originating from a third party network according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

210: judgment

220: setting unit

230: delivery unit

310: analysis unit

320: delivery unit

Claims (12)

Determination unit for determining whether the call to the interrogating call session control function (I-CSCF); A setting unit for analyzing routing information included in the incoming call and adding routing information of the I-CSCF to the routing information when the call is introduced into the I-CSCF as a result of the determination; And It is a device for routing processing in the IMS network comprising a; transmission unit for transmitting to the I-CSCF a call containing routing information to which the routing information of the I-CSCF is added, The I-CSCF, the analysis unit for analyzing the routing information of the incoming call from the third party network; And a forwarding unit for deleting the routing information of the I-CSCF from the routing information analyzed by the analyzing unit and transferring the incoming call from the third party network to the own network. The method of claim 1, The incoming call to the I-CSCF, the apparatus for routing processing in the IMS network delivered to the third party network. The method of claim 1, The incoming call to the I-CSCF, the apparatus for routing processing in the IMS network originated from an application server (Application Server). delete delete The method of claim 1, Routing information of the incoming call from the third-party network is set based on the routing information of the call transferred to the third-party network through the I-CSCF. Determining, by the apparatus for routing processing, a call entry to an Interrogating Call Session Control Function (I-CSCF); Analyzing, by the apparatus for the routing processing, routing information included in the incoming call when the call arrives in the I-CSCF and adding routing information of the I-CSCF to the routing information; The apparatus for routing processing forwarding a call to the I-CSCF including routing information added with routing information of the I-CSCF; Analyzing, by the I-CSCF, routing information of an incoming call from a third party network; And Forwarding, by the I-CSCF, the routing information of the I-CSCF from the analyzed routing information, and forwarding a call received from the third party network to the own network. The method of claim 7, wherein In the step of forwarding the call to the I-CSCF, wherein the call forwarded to the I-CSCF is forwarded to a third party network. The method of claim 7, wherein The determining whether the call is incoming, the method for routing processing in the IMS network comprising the step of determining whether the incoming call from the application server (Application Server). delete delete The method of claim 7, wherein The routing information of the call received from the third party network is set based on the routing information of the call transferred to the third party network through the I-CSCF.

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