KR20080055100A - Method for providing call service between heterogeneous networks - Google Patents

Abstract

A call service supply method in case of handover between heterogeneous networks is provided to be capable of omitting a procedure which demands an intelligent network interface between an S-CSCF(Serving Call Session Control Function) and a VCC(Voice Call Continuity) application server, thereby minimizing requirements of a mobile communication network. A call is requested through a CDMA(Code Division Multiple Access) I/F from a DBDM(Dual Band Dual Mode) terminal(S101). A GMSC(Gateway Mobile Service Switching Center) receiving the requested call delivers the call to an octave-C4(MGCF(Media Gateway Control Function)) based on sending routing or PSI(Public Service Identity) prefix routing(S102-S105). The octave-4(MGCF) delivers the call to an I(Interrogating)-CSCF based on prefix routing. The I-CSCF delivers the call to a VCC application server after obtaining a VCC address by interworking with an HSS(Home Subscriber Server). The terminal moves to a receiving number, depending on whether the call is received(S106).

Description

Method for providing call service between heterogeneous networks

1 is a block diagram showing provision of a Voice Call Continuity (VCC) service according to the present invention;

2 is a flowchart illustrating a code division multiple access (CDMA) transmission of a dual band dual mode (DBDM) terminal proposed by a 3GPP standard;

3 is a flowchart illustrating a code division multiple access (CDMA) transmission of a dual band dual mode (DBDM) terminal according to the present invention;

4 is a flow chart of an IMS (International Mobile Station) incoming call signal presented by the 3GPP standard;

 5 is a flow chart of an IMS incoming call according to the present invention;

6 is a flow diagram of CDMA incoming call output according to the present invention.

<Description of Symbols for Main Parts of Drawings>

101: VCC application server 102: IMS core

103: signal conversion gateway 104: DBDM terminal

105: mobile network switch (MSC) 106: OEP (Other End Point)

107: MGW (Media Gateway) UE1: User Element 1

VMSC: Visited MSC

MGCF: Media Gateway Control Function MGW: Media Gateway

I-CSCF: Interrogating-Call Session Control Function

S-CSCF: Serving-Call Session Control Function

P-CSCF: Porxy-Call Session Control Function

HSS / HLR: Home Subsriber Server / Home Location Register

DBDM: Dual Band Dual Mode

GMSC: Gateway Mobile Service Switching Center

MGCF (Octave-C4): Media Gateway Control Function

The present invention relates to a call service in a DBDM (Dual Band Dual Mode) terminal, and more particularly, to a method of providing a call service in a handover between heterogeneous networks capable of minimizing heterogeneous network requirements.

International standards bodies such as 3GPP (TR23.806, TS23.206, TS24.206, etc.) and 3GPP2 (X.P0042-001) have handed over between the International Mobile Station (IMS) and the Circuit Switched (CS) domain. Work is underway on the Voice Call Continuity (VCC) standard to provide call services. In order to provide VCC service, CS (CDMA, GSM, etc.) access I / F is provided and dual mode terminal which can access IMS network through Wibro (Wireless Broadband) or WiFi I / F, IMS-based VCC application for VCC service A cooperation system between an application server and an IMS provider and a CS provider is required.

In the relevant international standard, as a network requirement of a mobile network operator for providing VCC services, WIN / CAMEL intelligent network I / F is provided between MSC-VCC application servers and the VCC subscriber information management function is required in the mobile network HLR. There is a situation.

The present invention was created in view of the above circumstances, and the present invention requires a mobile network operator cooperation system to provide a VCC service, and minimizes the requirements of the mobile network in a negotiation process for establishing a cooperation system. The present invention provides a call service method for handover between heterogeneous networks.

In order to achieve the above object, a method for providing a call service during inter-network handover according to the present invention includes a first step of receiving a call from a DBDM terminal through CDMA I / F;

GMSC receiving the call forwards the call to Octave-C4 (MGCF) based on outgoing routing or PSI prefix routing; and receiving the call, Octave-C4 (MGCF) forwards the call to I-CSCF based on prefix routing. Forwarding the call, receiving the call, interworking with the HSS, acquiring the VCC address, and then forwarding the call to the VCC application server; and depending on whether the call is received by MMS, POTS, PSTN / CDMA Characterized in that the step of moving to the called party number.

In order to achieve the above object, a call service method for handover between heterogeneous networks according to the present invention includes a step in which GMSC receives an MSISDN routing request with a called number, and prefix routing according to an incoming route of the GMSC. Forwarding the call to C4 (MGCF), forwarding the call to I-CSCF after Octave-C4 (MGCF) interworking with the transferred call, and after the I-CSCF interworks with the HSS by the call And forwarding the call to the S-CSCF, and if the call is forwarded to the VCC application server after the step, the VCC application server is configured to determine the IMS incoming.

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

1 is a block diagram illustrating provision of a Voice Call Continuity (VCC) service according to the present invention.

Referring to FIG. 1, the apparatus for providing a VCC service of the present invention includes a VCC application server 101 for providing a VCC service, a 3GPP IMS standard based IMS Core 102 interoperating with the VCC application server 101, and the IMS Core. A signal conversion gateway 103 for interworking between the 102 and the circuit switched (CS) network, an MGW (Media Gateway) 107 for interworking the CS network with the IMS Core 102, and an MSC 105 for the communication network. And, it is composed of OEP (Other End Point) 106, DMBM terminal 104.

The VCC application server 101 configured as described above maintains CDMA and IMS call processing states for VCC subscribers and provides a seamless VCC service when a handover occurs between heterogeneous networks.

2 is a code division multiple access (CDMA) transmission flowchart of a dual band dual mode (DBDM) terminal 104 according to the 3GPP standard.

Referring to FIG. 2, when the call setup domain of UE1 is determined (S1), UE1 requests call setup from VMSC (S2). Subsequently, the VMSC requests the VCC to provide the VCC service through triggering (S4). The VCC determines the anchor by approving the request of UE1 (S5). At this time, IMRN (IP Multimedia Routing Number) is transmitted to the VMSC (S6). The IMRN includes public service identity (PSI) information for delivering a call to the IMS domain (S7 to S8). As such, an intelligent network interface for requesting and approving a VCC service is required between the VMSC and the VCC application server (S9 to S15).

When such an interface is required, a CDMA origination procedure of a DBDM terminal is required to provide an efficient call service between heterogeneous networks.

FIG. 3 is a flowchart illustrating a code division multiple access (CDMA) transmission of a dual band dual mode (DBDM) terminal according to the present invention. The difference from FIG. 2 is that a procedure for requesting an intelligent network interface between the MSC and the VCC application server 101 is omitted. Is that.

Referring to FIG. 3, the DBDM terminal requests a call to GMSC through CDMA I / F (S101), and the GMSC forwards the call to Octave-C4 (MGCF) based on an outgoing routing or a PSI prefix routing ( S102), and receiving the call, Octave-C4 (MGCF) forwarding the call to the I-CSCF based on prefix routing (S103), and receiving the call and the I-CSCF in association with the HSS, a VCC address. Acquiring the call and transmitting the call to the VCC application server (S104), and moving the call to the corresponding call number according to whether the call is MMS, POTS, or PSTN / CDMA (S105).

The CDMA outgoing flow of the DBDM terminal configured as described above can implement the call service without requiring the intelligent network interface between the MSC and the VCC application server by going through the above five steps.

FIG. 4 is a flow chart of an international mobile station (IMS) call origination proposed by the 3GPP standard, and illustrates a case in which a general subscriber other than a VCC subscriber requests a call to an MSISDN number of a VCC subscriber to an IMS via a CS domain.

Referring to FIG. 4, when requesting a call with an MSISDN number (S21), the GMSC acquires VCC subscriber information and intelligent network trigger information in association with the HSS / HLR (S22 and S23).

Subsequently, the VCC service is requested and approved using the intelligent network interface of the communication network described in FIG. 2 (S24 to S26). At this time, the IP Mutimedia Routing Number (IMRN) is transmitted to the VMSC (Visited MSC) through step S26. Here, the IMRN includes Public Service Identity (PSI) information for transmitting a call to the IMS domain (S27 to S35).

As such, when applying the international standard method, it becomes an intelligent network interface between the MSC and the VCC application server, and has a disadvantage in that VCC subscriber information management must be performed in the mobile network HLR.

In order to secure this disadvantage, the intelligent network interface can be omitted by performing the process of IMS call origination shown in FIG. 5 of the present invention.

5 is a flowchart illustrating call registration between an IMS network and a CS domain according to the present invention, and a procedure for requesting an intelligent network interface between an MSC and a VCC application server is omitted.

Referring to Figure 5, GMSC receives the MSISDN routing request to the called number (S41), and forwards the call to Octave-C4 (MGCF) through prefix routing according to the GMSC route (S42) ), And transmitting the call to the I-CSCF by the Octave-C4 (MGCF) after linking the ENUM to the transferred call (S43), and calling the corresponding S-CSCF after the I-CSCF is interworked with the HSS by the call. Transmitting (S44), triggering the S-CSCF to the corresponding VCC application server with reference to iFC (S45), and determining the IMS call in consideration of subscriber registration status, preferences, and operator policies (S46). 47), the procedure for requesting the intelligent network interface between the MSC and the VCC application server is omitted (S41 ~ S48).

6 is a flowchart illustrating call registration between a CDMA network and a CS domain according to the present invention, and the call registration can be performed in the CDMA network as shown in FIG.

Referring to Figure 6 GMSC receives the MSISDN routing request to the called number (S51), and forwarding the call to Octave-C4 (MGCF) through the prefix routing according to the GMSC route (S52) And transmitting the call to the I-CSCF by the Octave-C4 (MGCF) after the ENUM association with the transferred call (S53), and when the called subscriber is in the Un-Register state by the call, the I-CSCF is connected to the HSS. Allocating the S-CSCF in cooperation with the S-CSCF and transmitting the call to the S-CSCF (S54), the S-CSCF triggering the VCC application server with reference to the iFC (S55), subscriber registration status, Preference, operator policy The procedure for requesting the intelligent network interface between the MSC and the VCC application server is omitted through the step (S56, 57) of determining the CDMA call in consideration (S51 ~ S58).

As such, the present invention minimizes the requirements of the mobile network by omitting the procedure for requesting the intelligent network interface between the S-CSCF and the VCC application server.

As described above, according to the call service providing method for handover between heterogeneous networks according to an embodiment of the present invention, a communication service provider cooperation system is required to provide VCC service, and a communication service network is negotiated in a negotiation process for establishing a cooperation system. This has the advantage of minimizing the requirements.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (4)

A first step of receiving a call from the DBDM terminal through CDMA I / F; A second step of GMSC requesting the call forwards the call to Octave-C4 (MGCF) based on outgoing routing or PSI prefix routing; A third step of receiving the call and forwarding the call to the I-CSCF based on prefix routing based on Octave-C4 (MGCF), A fourth step of receiving the call and acquiring the VCC address by interworking with the HSS and transmitting the call to the VCC application server; And a fifth step of moving to a corresponding destination number according to whether the call is received. The method of claim 1, wherein the call is any one of MMS, POTS, and PSTN / CDMA. The first step in which the GMSC receives the MSISDN routing request with the called number; A second step of forwarding a call to Octave-C4 (MGCF) via prefix routing according to the GMSC's incoming route, A third step of forwarding the call to the I-CSCF by the Octave-C4 (MGCF) by the transferred call; A fourth step of forwarding the call to the corresponding S-CSCF after the I-CSCF is interworked with the HSS by the call; And transmitting the call to the VCC application server after the fourth step, wherein the VCC application server has a fifth step of determining an IMS call. [4] The call service of claim 3, further comprising: providing an Un-Register service by allocating a specific S-CSCF when the called subscriber is in an Un-Register state in the fourth step. How to Provide.

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