KR20080051813A - How to apply global number between heterogeneous IMS networks - Google Patents

Abstract

The present invention relates to a method for applying a global number between heterogeneous IMS networks, the first process of converting a destination number of a local number format into a global number format when receiving a called number of a local number format from a calling terminal of a PSTN or IMS network; A second process of transmitting the global number format message to the called party's PSTN or IMS network; and when the called party is the IMS network, the global number format message is transmitted to the HSS to receive subscriber information, according to the subscriber information. A third step of converting the received global number format message into a local number format and transmitting the message to a called terminal; and converting the global number format message into a local number format and transmitting the received message to a called terminal when the called party is a PSTN. By including the fourth step, global numbers can be generated between heterogeneous IMS networks while minimizing the requirements of existing systems. Disclosed are techniques for enabling use.

Description

How to apply global number of heterogeneous IMS network {METHOD FOR APPLICATION GLOBAL NUMBER BETWEEN HETEROGENEOUS IP MULTIMEDIA SUBSYSTEM}

1 is a block diagram of a system applying a global number between heterogeneous IMS networks according to an embodiment of the present invention.

2 is a view for explaining a method for transmitting from the SIP terminal of the operator 1 to the SIP terminal of the operator 2 of FIG.

3 is a view for explaining a method for transmitting from the SIP terminal of the operator 1 of the operator 1 to the POTS terminal of the operator 2.

4 is a view for explaining a method of transmitting from a POTS terminal of a service provider 1 of FIG. 1 to a SIP terminal of a service provider 2. FIG.

<Description of Symbols for Main Parts of Drawings>

10: POTS terminal

20: SIP terminal

30: PSTN exchanger

40: MGCF (Media Gateway Control Function)

50: Call Session Control Function (CSCF)

51: I-Call Session Control Function (I-CSCF)

52: S-CSCF (Call Session Control Function)

60: HSS (Home Subscriber Server)

The present invention relates to a method for applying a global number between heterogeneous IMS networks, and more particularly, a technique for using a global number between heterogeneous IMS networks while minimizing requirements of an existing system.

Recently, the next generation communication system is changing to a ubiquitous environment in which wired and wireless integrated environments are pursued. IP Multimedia Subsystem (IMS) is a core technology for providing services such as wired / wireless integration, voice / data integration, and communication / broadcast convergence in a broadband convergence network.

IMS is a network system that can provide multimedia services such as audio, video, text and chat by interworking heterogeneous networks (eg, cellular, WLAN, WiBro, etc.) using IP-based packet networks. A standard is underway at 23,228. An access network (AN) connected to each network is linked to the core network (CN) of IMS.

Such an IMS can interoperate with an IP-based network, so that if a user establishes a session in one network, the user can also receive IP services of an external network. In addition, a user can access a network that is advantageous to the user when he can be connected to multiple networks.

For example, users connected to an IMS can not only play a game directly on the network, but also have voice conversations with each other. In addition, when access to multiple networks is possible, the user can access a relatively low-cost network or an efficient network according to the type of IP service.

However, it takes a long time for the existing communication environment to be fully converted to IMS-based, and standardization of IMS technology is still in progress. Therefore, technical implementation of already established international standards is urgently needed.

As a part of this, the number used when mapping TEL-URI to SIP URL in interworking between other operators adopting IMS Architecture is to support ENUM (Email and Phone Numbering Mapping) linking in the future. This should be done with the appropriate prefix number. That is, use a globally unique Global Number or National Number following the e.164 numbering system.

However, many operators adopt TEL-URI as a local number for convenience, which can be a big obstacle to interworking between heterogeneous networks, which is an essential process for implementing next-generation converged networks based on future standards.

That is, the 3GPP IMS standard expresses TEL-URI in the form of a global number (eg + 82-2-123-4567) that follows the e.164 numbering system. Many of them express TEL-URI in the form of a local number (eg, 02-123-4567).

TEL-URI must be converted into a Global Number format to be linked to other domestic and international network based on future standards, but it is a practical limitation that all SIP related systems use Global Number. There is this big problem.

Accordingly, an object of the present invention to solve the above problems is to enable the use of global numbers in heterogeneous IMS networks while minimizing the requirements of existing systems.

The global number application method between heterogeneous IMS networks according to an embodiment of the present invention for achieving the above object, when receiving the destination number of the local number format from the calling terminal of the PSTN or IMS network, the destination number of the local number format global number A first process of converting the message to a format; a second process of transmitting the global number format message to a called party's PSTN or IMS network; and if the called party is an IMS network, transmitting the global number format message to an HSS to provide subscriber information. A third process of converting the received message of the global number format according to the subscriber information into a local number format and transmitting the received message to the called terminal; and if the called party is a PSTN, the message of the global number format to the local number And a fourth process of converting the format into a called terminal.

In addition, the global number application method between heterogeneous IMS networks according to an embodiment of the present invention, when receiving the destination number of the local number format from the calling terminal, the first CSCF converts the destination number of the local number format to the global number format in the calling CSCF A second process of transmitting the global number format message to the called party I-CSCF, a third process of receiving the subscriber information by transmitting the global number format message to the HSS from the called party I-CSCF; And a fourth process of transmitting the message of the global number format to the S-CSCF according to the subscriber information, converting the global number into a local number format and transmitting the message to the called terminal in the S-CSCF. .

In addition, the global number application method between heterogeneous IMS networks according to an embodiment of the present invention, when receiving the destination number of the local number format from the calling terminal, the first CSCF converts the destination number of the local number format to the global number format in the calling CSCF And a second process of transmitting the global number format message to the called party MGCF, and a third process of converting the global number format message into a local number format from the called party MGCF to a called terminal through a PSTN exchange. Characterized by including the process.

In addition, the global number application system between heterogeneous IMS networks according to an embodiment of the present invention, the CSCF for converting the local number and the global number, and the subscriber information, and HSS for transmitting the subscriber information when the subscriber information is requested from the CSCF And, MGCF interoperating with the CSCF and the PSTN exchanger by translating the local number and the global number.

There are two types of call routing in IP Multimedia Subsystem (IMS): Prefix routing and ENUM (E-mail and Phone Numbering Mapping) query routing. In other words, ENUM server performs call routing by giving corresponding IP address information about Query of domain information. The present invention assumes a manner of prefix routing.

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

1 is a block diagram of a system to which heterogeneous IMS network global numbers are applied according to an embodiment of the present invention.

The system applying the global number of heterogeneous IMS networks of the present invention includes a plain old telephone service (POTS) terminal 10, a session initiation protocol (SIP) terminal 20, a public switched telephone network (PSTN) switch 30, and a MGCF (Media). Gateway Control Function (40), Call Session Control Function (CSCF) 50, and Home Subscriber Server (HSS) 60.

The POTS terminal 10 is a wired network telephone terminal for basic voice service through a PSTN network, and the SIP terminal 20 refers to a terminal that provides a call service through an IP network.

The PSTN exchanger 30 interworks with the POTS terminal 10 and the MGCF 40 to check whether the called number is a local number.

The CSCF 50 is a system defined in the 3GPP IMS standard and performs functions such as SIP terminal registration, session connection and management, and triggering to an application server (AS). To this end, the CSCF 50 has an I-CSCF 51 and an S-CSCF 52. In the present invention, the I-CSCF 51 requests the address information of the S-CSCF 52 from the HSS 60 when receiving the global number, and receives the address information to the S-CSCF 52. Send the number. Accordingly, the S-CSCF 52 converts the global number into a local number and transmits it to the called terminal.

The HSS 60 is a system defined in the 3GPP IMS standard and serves as a master database of subscribers. That is, the HSS 102 is a kind of database in which the functions of the home location register and the functions for mobility management and authentication of the IP multimedia subscriber are integrated as the master database of the subscriber.

In addition, the HSS 60 has a public user identity (ID), which is an identity of an address concept used for call routing between actual subscribers. It consists of SIP-URI and TEL-URI and is stored in an Implicitly Registered Set (IRS). This means that if one ID is registered in the IRS, all other IDs in the IRS are registered at the same time. In order to apply global number when interworking between heterogeneous networks, HSS should include global number as well as local number as TEL-URI as shown in Table 1 below.

sip: kdhong@octave.com tel: 021234567 tel: +8221234567

That is, the HSS 60 must have the three public IDs above, which must be tied to the IRS relationship. At this time, as a separate assumption, it is necessary to assume that operators do not use the same country code for the same area code and cannot call by entering the country code in the terminal.

Accordingly, the requirements of the CSCF 50 are as follows. First, if a number is entered without an area code, it should not be skipped to another provider. If the area code is included, the prefix should be controlled and converted to a global number if the prefix is another company's prefix.

On the other hand, the requirements of the MGCF 40 is as follows. In the case of PSTN incoming, the MGCF 40 receives the global number but must convert it to a local number for smooth call routing.In the case of PSTN origination, the local number on the terminal must be converted to a global number like the CSCF 50. do.

In FIG. 1, when a breakout occurs to a PSTN in an IMS network, a BGCF (Breakout Gateway Control Function) that selects an MGCF 40 interworking with the PSTN, or mutual conversion and connection between an RTP / IP and a PCM bearer Notation such as MGW (Media Gateway) or AS (Application Server) that provides inbound / outgoing service of call subscribers is omitted and does not mention the situation when it is not linked with other IMS networks.

In addition, the present invention is not all the SIP-related systems, such as CSCF, HSS, MS, AS, like the standard, but to use the global number at the manganese interworking point to minimize the requirement to the existing system, this Several requirements and assumptions can be made to the HSS 60 and CSCF 50 for this purpose.

As such, the present invention is the exact format of the standard local number of tel-uri is as follows.

"tel: local_number; phone-context = area",

For example, in the case of tel: 021234567; phone-context = + 82, 'area' means a range limit that can be used. For example, in the above example, the number indicates that it can be used only in Korea.

Accordingly, the CSCF 50 or the MGCF 40 will not allow the call if the available range of the called number is not in the home domain.

Hereinafter, referring to FIG. 2, a method of applying a global number when calling from the SIP terminal of the service provider 1 to the SIP terminal of the service provider 2 will be described in detail.

First, the SIP terminal 20 of the operator 1 attempts to make a call by inputting the called number TEL URL as a local number (S11). For example, enter 02-1234-5678 to attempt the call.

Accordingly, when the calling party's CSCF 50 determines that the TEL-URI is a local number, the ICSF 510 of the service provider 2 is removed by attaching "+" and the country code "82" to the e.164 numbering system. Transfer to (S12). For example, when the called number is '02 -123-4567 ', the CSCF 50 modifies to' + 82-2-123-4567 '. That is, the calling party's CSCF 50 does not interwork with other companies if the incoming number received from the SIP terminal 20 does not have an area code. If the operator prefix, remove the '0' of the area code and add the country code to the global number.

Thereafter, the I-CSCF 510 of the called party 2 sends the received global number to the HSS 60 to request the called party's subscriber information (S13), whereby the HSS 60 is a subscriber number management server. Since the TEL-URI of the format is also included in the IRS (Implicite registered set), the I-CSCF 510 informs the I-CSCF 510 of the address information of the S-CSCF to which the subscriber belongs to the message asking the subscriber of the TEL-URI (S15).

Subsequently, the I-CSCF 510 transmits the message including the global number to the corresponding S-CSCF 520 (S15), and the S-CSCF 520 determines that the TEL-URI of the received message is the global number, and e Remove the '+82' of the .164 numbering system and attach '0' to convert the TEL-URI into a local number format and transfer it to the SIP terminal 200 of the service provider 2 (S16). That is, it is transmitted to the SIP terminal 200 as 02-123-4567 in local number format.

Hereinafter, referring to FIG. 3, a method for applying a global number when the service provider 1 transmits from the service provider SIP terminal to the service provider POTS terminal will be described in detail. FIG.

First, the SIP terminal 20 attempts to call by inputting the called number in the local number format (S21). For example, enter 02-123-4567 to attempt the call.

Accordingly, as in the case of the call between the SIP terminals of FIG. 2, when the calling party CSCF 50 determines that the number received from the SIP terminal 20 is a local number, the calling party MGCF converts the local number into a global number form. (S22). In other words, the local number format 02-123-4567 is converted to + 82-2-123-4567 in the global number format by removing the '0' from the e.164 numbering system and appending "+" and the country code '82'.

Thereafter, the called party's MGCF 400 removes the country code " 82 &quot; of the global number and appends &quot; 0 &quot; to convert it into a local number format such as '02 -123-4567 '. At this time, the MGCF in charge of providing the PSTN / PLMN interface in the IMS structure transmits '02 -123-4567 'in the form of a local number to the PSTN exchanger 300 via an MGW (Media Gateway, not shown) for protocol conversion.

Accordingly, the PSTN exchange 300 searches for its own prefix table, finds the corresponding subscriber, and routes the call message to the corresponding POTS terminal 100.

Hereinafter, with reference to FIG. 4, the global number application method in case of transmitting from the POTS terminal of the operator 1 to the SIP terminal of the operator 2 will be described in detail. FIG. 4 illustrates an example in which the e.164 numbering system information received through the PSTN network is changed from the MGCF 40 to a SIP message having a TEL-URI in the global number format and routed to the called party. do.

First, the POTS terminal 10 attempts to call by inputting the called number in the local number format (S31). For example, enter 02-123-4567 to attempt the call.

Accordingly, the PSTN switch 30 transmits the called number in the local number format to the MGCF 40 (S32).

Thereafter, the MGCF 40 converts the called number '02 -123-4567 'in local number format to' + 82-2-123-4567 'in global number format and delivers it to the I-CSCF 510 on the called side. (S33).

Accordingly, the I-CSCF 510 sends the received global number to the HSS 60 to request the called party's subscriber information (S34). Accordingly, the HSS 60 also manages the TEL-URI of the global number format as the subscriber information management server. Since it is included in the IRS (Implicite registered set), it informs the I-CSCF 510 of the address information of the S-CSCF to which the subscriber belongs to the message asking the subscriber of the corresponding TEL-URI (S35).

Subsequently, the I-CSCF 510 forwards the message including the global number to the corresponding S-CSCF 520 (S36), and the S-CSCF 520 determines that the TEL-URI of the received message is the global number, and e Remove the '+82' of the .164 numbering system and attach the '0' to convert the TEL-URI into a local number format and transfer it to the SIP terminal 200 of the service provider 2 (S37). That is, it is transmitted to the SIP terminal 200 as 02-123-4567 in local number format.

 As described above, the present invention is based on the prefix control scheme of CSCF and MGCF and the adjustment of the Implicit Register Set (IRS) of the HSS between heterogeneous networks using other local numbers that do not include the country code as the TEL-URI in the BcN environment. Allows global numbers to be applied at interworking points.

In other words, after the call message enters the PSTN network, if the SIP protocol is not used, the e.164 numbering system information is used as it is. In the section using the SIP protocol, e.164 numbering system information is included. -URI header, etc. should be changed to global password.

For reference, the transmission procedure and format of call related messages shown in the present invention are described in detail in TS 23.228 and TS 24.228.

As described above, the present invention enables the use of global numbers between heterogeneous IMS networks while minimizing the requirements of the existing system, and efficiently interoperates with other operators' networks in the future based on international standards. The effect is to make it possible.

In addition, the preferred embodiment of the present invention for the purpose of illustration, those skilled in the art will be able to various modifications, changes, replacements and additions through the spirit and scope of the appended claims, such modifications and changes are the following claims Should be seen as belonging to.

Claims (18)

A first step of converting the called number of the local number format into the global number format when receiving the called number of the local number format from the calling terminal of the PSTN or IMS network; A second step of transmitting the global number format message to a called party's PSTN or IMS network; When the called party is an IMS network, receiving the subscriber information by transmitting the message of the global number format to the HSS, converting the received message of the global number format according to the subscriber information into the local number format and transmitting the message to the called terminal. 3 courses; And And a fourth process of converting the global number format message into a local number format and transmitting the message to a called terminal when the called party is a PSTN. The method of claim 1, wherein the first process comprises: And a method of determining whether the format of the called number is a local number. The method of claim 1, wherein the first process comprises: If the called number does not have an area code, it does not interoperate with other companies, whereas if it contains an area code, if the prefix is another operator's prefix, remove the '0' from the area code and attach the country code to the global number. Global number application method between heterogeneous IMS network, characterized in that the conversion to the format. According to claim 1 or 3, wherein the third process, And obtaining address information of the S-CSCF from an IRS (Implicite registered set) storing the TEL-URI of the global number format and the TEL-URI of the local number format. According to claim 1 or 3, wherein the third process and the fourth process, A method for applying a global number between heterogeneous IMS networks, comprising: removing a country code of the global number and attaching a '0' to the local number. A first step of converting the called number of the local number format into the global number format in the calling CSCF when receiving the called number in the local number format from the calling terminal; A second step of transmitting the global number format message to a called party's I-CSCF; A third step of receiving the subscriber information by transmitting the global number format message to the HSS in the called party I-CSCF; And And a fourth process of transmitting the message of the global number format to the S-CSCF according to the subscriber information, converting the global number into a local number format of the S-CSCF and transmitting the message to the called terminal. How to apply global number between IMS networks. The method of claim 6, wherein the first process, And a method of determining whether the format of the called number is a local number. The method of claim 6, wherein the first process, In the case of an outgoing call through a PSTN, a global number application method between heterogeneous IMS networks, characterized in that MGCF converts a called number of a local number format into a global number format. The method of claim 6, wherein the first process, If the called number does not have an area code, it does not interwork with a third party company. If the called number contains an area code, if the prefix is another operator's prefix, remove the '0' of the area code and attach the country code to the global number. Global number application method between heterogeneous IMS network, characterized in that the conversion to the format. The method of claim 6 or 9, wherein the third process, And obtaining address information of the S-CSCF from an IRS (Implicite registered set) storing a TEL-URI of a global number format and a TEL-URI of a local number format in the HSS. The method of claim 6 or 9, wherein the fourth process, A method for applying a global number between heterogeneous IMS networks, comprising: removing a country code of the global number and attaching a '0' to the local number. A first step of converting the called number of the local number format into the global number format in the calling CSCF when receiving the called number in the local number format from the calling terminal; A second step of transmitting the global number format message to a called party's MGCF; And And a third process of converting the message of the global number format into a local number format by the called party MGCF and transmitting the message to the called terminal through a PSTN exchanger. The method of claim 12, wherein the first process comprises: If the called number does not have an area code, it does not interwork with a third party company. If the called number contains an area code, if the prefix is another operator's prefix, remove the '0' of the area code and attach the country code to the global number. Global number application method between heterogeneous IMS network, characterized in that the conversion to the format. The method of claim 12 or 13, wherein the third process, A method for applying a global number between heterogeneous IMS networks, characterized in that the country number of the global number is removed and a '0' is added to the local number. CSCF for converting local and global numbers; An HSS that manages subscriber information and delivers the subscriber information when requested by the CSCF; And A system for applying global numbers between heterogeneous IMS networks, comprising MGCF interoperating with the CSCF and PSTN exchanges by converting local and global numbers. The method of claim 15, wherein the CSCF and MGCF, If the called number does not have an area code, it does not interwork with a third party company. If the called number contains an area code, if the prefix is another operator's prefix, remove the '0' of the area code and attach the country code to the global number. Global number application system between heterogeneous IMS networks, characterized in that the conversion to the format. The method of claim 15, wherein the CSCF, The system of claim 1, wherein the address information of the S-CSCF is obtained from an IRS (Implicite registered set) storing a global number format TEL-URI and a local number format TEL-URI in the HSS. The method of claim 15, wherein the CSCF and MGCF, A global number application system between heterogeneous IMS networks, wherein the international number is converted to the local number by removing the country code of the global number and attaching '0'.

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