KR101629815B1 - 3G Mobile Communication System supporting Service Centralized and Continuity and Method thereof - Google Patents

Abstract

A 3G mobile communication system supporting SCC and a method thereof are provided. The 3G mobile communication system supporting the SCC registers the location of the mobile terminal according to the location registration request with the 3G mobile switching center which routes the location registration request of the mobile terminal when the location registration to the CS domain of the mobile terminal is requested, A home subscriber server for transmitting location registration information according to location registration; And an SCC application server for storing location registration information of the mobile terminal.

Description

[0001] The present invention relates to a 3G mobile communication system supporting SCC, and a 3G mobile communication system supporting < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a service centralized and continuity (SCC) in a 3G mobile communication system.

In the 3G mobile communication system, the service continuity and centralization (SCC) is a general circuit switched (CS) system connected via a Universal Terrestrial Radio Access Network (UTRAN), a GSM DEGE Radio Access Network (GERAN), or an IP Multimedia Subsystem (IMS) Domain selection for the mobile terminal used in the domain to connect the call through the IMS domain, and domain transfer for routing the connected call to another system depending on the condition. In this way, the coverage of the wireless service can be increased, and in particular, some calls can be handed over to the wireless network, i.e., the IM core network subsystem, so that the load on the mobile communication network can be reduced.

However, current SCC architecture does not support backward compatibility with 3G mobile communication system (WCDMA) and some call processing.

The present invention proposes a location registration call processing procedure for implementing an SCC function in a location registration through a CS domain in a WCDMA network. Through this, it is possible to provide seamless services based on FMC (Fixed Mobile Convergence) by allowing the mobile communication subscriber to grasp all information of the network registered through the IMS-based SCC.

According to an aspect of the present invention, there is provided a mobile communication system capable of performing location registration through a CS domain in a 3G mobile communication system and then performing location registration with an SCC application server in an IMS domain.

According to an embodiment of the present invention, when a location registration to a CS domain of a mobile terminal is requested, a 3G switching center that routes a location registration request of the mobile terminal; A home subscriber server for registering a location of the mobile terminal according to the location registration request and transmitting location registration information according to location registration of the mobile terminal; And an SCC application server for storing location registration information of the mobile terminal.

According to another aspect of the present invention, there is provided a method for a mobile terminal to perform location registration through a CS domain in a 3G mobile communication system and then perform location registration with an SCC application server in an IMS domain.

According to an embodiment of the present invention, there is provided a method of implementing an SCC function in a 3G mobile communication system, the method comprising: (a) routing a location registration request to the mobile terminal when location registration is requested from the mobile terminal; (b) performing location registration with respect to the mobile terminal according to the location registration request, and transmitting location registration information to the SCC application server; And (c) storing location registration information for the mobile terminal in the SCC application server. The method for implementing the SCC function in the 3G mobile communication system may be provided.

The SCC function can be implemented in the 3G mobile communication system according to the present invention. Through this, the FMC (Fixed Mobile Convergence) -based seamless service can be provided by allowing all information of the network registered by the mobile communication subscriber to be grasped through the IMS-based SCC.

FIG. 1 is a configuration diagram showing a 3G mobile communication system supporting SCC. FIG.
2 is a diagram illustrating a procedure for registering a location with a SCC application server supporting SCC when a user terminal is registered through a 3G CS domain in a 3G mobile communication system supporting SCC;

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate a thorough understanding of the present invention, the same reference numerals are used for the same means regardless of the number of the drawings.

1]

1 is a configuration diagram illustrating a 3G mobile communication system supporting SCC.

Referring to FIG. 1, a 3G mobile communication system supporting SCC includes a switching center 120, a media gateway control function 130, a call session control function 140, Service Centralization and Continuity) application server 150 and a Home Subscriber Server (HSS) 160.

 The mobile terminal 110 is a user apparatus for using a mobile communication service. The mobile terminal 110 is a terminal capable of using a service in a Circuit Switched (CS) domain according to a mobile communication system. Examples of the type of the mobile terminal 110 include a Personal Computer (PC), a Personal Digital Assistant (PDA), a Hand-Held PC, a Global System for Mobile (GSM) phone, a WCDMA phone, Mobile Broad and System) phones. That is, when the mobile terminal 110 supports the IMS function, the mobile terminal 110 can be applied without any exception.

In addition, when receiving the location registration response including the SCC routing information according to the location registration request through the CS domain from the switching center 120, the mobile terminal 110 transmits the location registration request to the SCC application server 150 of the IMS domain, The request can be sent.

The switching center 120 has a function of controlling the radio base stations to operate efficiently and a function of interworking with the public telephone network and the exchange center of other networks. In addition, the switching center 120 acquires the subscriber profile from the home subscriber server 160 according to the location registration request of the mobile terminal 110, and when the subscriber profile is the SCC service subscriber terminal, performs the location registration response to the CS domain, Acquires routing information from the home subscriber server 160, and transmits the obtained routing information to the mobile terminal 110. The location registration process on the CS domain according to the location registration request of the mobile terminal 120 by the switching center 120 is obvious to those skilled in the art, and a detailed description thereof will be omitted. In addition, when receiving the outgoing call from the mobile terminal 110, the switching center 120 inquires the home subscriber server 160 of the GT (Global Title) through the incoming prefix number translation and inquires the location information of the called terminal And may then route to another exchange station where the called terminal is located according to the result.

The media gateway control function 130 provides protocol conversion between ISUP and IMS call control protocols. The media gateway control function 130 makes ISUP connection with the exchange 120 belonging to the CS domain and selects the call session control function 140 to route the incoming call to the IMS domain. According to the SCC specification defined in the mobile communication system, the media gateway control function 130 should support signaling interworking and media control between the CS domain and the IMS domain.

The call session control function 140 performs functions related to call processing in the IMS network. The call session control function 140 includes a call control function (CCF), a serving profile database (SPD), an address handling module AH: address handling, hereinafter referred to as " AH ").

The CCF is responsible for call setup, termination, and status / event management, call event reporting for billing, and reception and processing of application level registrations. The SPD communicates with the HSS of the home domain to manage the user profile information and performs a similar function to the VLR of the existing network that informs the home domain at the first access of the user. AH performs the functions of analyzing, converting, and modifying addresses and providing address mobility.

The call session control function 140 differs from the P-CSCF (Proxy-CSCF), the Interrogating-CSCF (I-CSCF), and the S-CSCF serving-CSCF).

The P-CSCF is a SIP proxy server that is the first connection point for the mobile terminal 110 in the IMS network. The P-CSCF exists in the home network or visited network. The mobile terminal 110 must acquire the P-CSCF location information to be connected, which is obtained through a dynamic host configuration protocol (DHCP) or a PDP context activation procedure. The P-CSCF is assigned to the mobile terminal 110 at the time of registration in the IMS network and is not changed during the registration period. In addition, the P-CSCF performs policy control, bandwidth management, and quality of service (QoS) control functions. The P-CSCF is included in the path of all signaling messages and checks all messages. In addition, the P-CSCF authenticates the user and establishes an IP sec security association with the mobile terminal 110. This prevents spoofing attacks, retransmission attacks, and protects users' privacy. The P-CSCF compresses or releases the SIP message using SigComp (signaling compression). This can reduce the round-trip of the wireless link. The P-CSCF generates a billing record (CDR).

The I-CSCF is located at the boundary of the management domain when the border function is not present. Therefore, the server of another domain finds the I-CSCF and exposes the IP address to the DNS of the domain so that it can be used as an input node of the network. The I-CSCF queries the HSS for the location of the mobile terminal 110 using the Cx or / and Dx interface and forwards the SIP message to the S-CSCF to which the mobile terminal 110 is assigned. The I-CSCF may perform a topology hiding inter-network gateway (THIG) of the firewall function when transmitting SIP messages between different domains, and may not transmit a part of the network information to another domain.

The S-CSCF is the central node of the signaling layer and performs session control as one SIP server. The S-CSCF is always present in the home network and uses the Cx / Dx interface to download the user profile from the HSS or upload the user profile to the HSS. In addition, the S-CSCF binds the location of the mobile terminal 110 and the SIP address at the time of SIP registration. The S-CSCF is included in the path of all signaling messages and examines all messages. In addition, the S-CSCF determines the server to provide the service and routes the SIP message to the application server.

The SCC application server 150 provides domain selection and domain transfer functions. The SCC application server 150 is responsible for anchoring the outgoing call delivered from the CS domain, anchoring for outgoing call delivered from the IMS domain, and domain switching. By the anchoring, the information about the outgoing call (Call ID) and the user identification information (Public User Identity) are stored. To this end, all calls from mobile terminals subscribed to the SCC service are delivered to the SCC application server 160.

The home subscriber server 160 supports IMS entities that perform session control as a user information database. The home subscriber server 160 stores user related subscription information related to the multimedia session control, i.e., location information of the user, security information for authentication and permission of the user, and user profile information including the service to which the user subscribes.

[Description of Figure 2]

2 is a diagram illustrating a procedure for registering a location with an SCC application server supporting SCC when a user terminal is registered through a 3G CS domain in a 3G mobile communication system supporting SCC. Here, the user terminal requesting the location registration is a 3G terminal.

In step 210, the mobile terminal 110 attempts to register the location through the exchange 120 (i.e., to the 3G CS domain).

In step 215, the MSC 120 transmits a location registration request message to the HSS 160 according to an attempt of location registration of the MSC. Here, the location registration request message may be a Location Update Request, which is a GSMMAP message.

In step 220, the HSS 160 notifies the location registration through the CS domain of the mobile terminal to the SCC application server 150 through a message such as a register through a SIP or similar protocol, and receives a response message to the SCC application server 150.

Here, the notification of the location registration through the CS domain of the user terminal between the HSS 160 and the SCC application server 150 and the response message therefor may be an SIP message or a message based on a protocol other than the SIP message .

In step 225, the HSS 160 receives a response message for location registration from the SCC application server 150 and transmits a location update response message to the exchange 120 in response to the location registration request message.

In step 230, the MSC 120 transmits a response message to the MS in response to the location registration response message upon receipt of the location registration response message.

Hereinafter, it is assumed that the mobile terminal 110 is a terminal supporting the IMS function. If the mobile terminal 110 is a 3G terminal that does not support the IMS function, the steps performed below may not be performed.

Hereinafter, a description will be made of a method of notifying the HSS 160 of the location registration to the SCC application server 150 when the mobile terminal attempts to register the location through the PS domain of the IMS.

In step 235, the mobile terminal sends a location registration request to the call session control function 140 responsible for the call processing in the IMS domain for location registration in the IMS PS domain. That is, the mobile terminal 110 may transmit a Session Initiation Protocol (SIP) REGISTER message including the identification information of the subscriber terminal to the call session control function 140.

In more detail, the mobile terminal transmits a SIP REGISTER message for requesting location registration to the P-CSCF. The P-CSCF then looks up the domain of the subscriber according to the SIP REGISTER message and sends the SIP REGISTER message to the I-CSCF. The I-CSCF inquires the home subscriber server 160 and transmits a UER (User Authorization Request) message for allocating the S-CSCF to the home subscriber server 160. The home subscriber server 160 (UAA) including S-CSCF information from the mobile station UE. Then, the I-CSCF transmits a SIP REGISTER message for the location registration request to the allocated S-CSCF.

In step 240, the call session control function 140 that has received the SIP REGISTER message transmits authentication information (401 unauthorized) required for authentication, such as an authentication vector, to the mobile terminal.

More specifically, the S-CSCF transmits a MAR (multimedia authentication request) message for requesting information required for authentication of the AT 110 to the home subscriber server 160, (MAA) and receives the information.

In step 245, the mobile terminal 110 authenticates according to a predetermined algorithm using the authentication information, and then transmits the SIP REGISTER message including the authentication result value to the call session control function 140 again.

In step 250, the call session control function 140 authenticates the user terminal using the authentication result value included in the SIP REGISTER message, and relays the SIP REGISTER message to the SCC application server 550 when the authentication is successful.

Accordingly, the SCC application server 550 can receive information on the location registration through the 3G mobile switching center even when the user terminal performs location registration through the 3G CS domain. Accordingly, the SCC application server 550 has an advantage in that the user terminal can determine which network is registered in which network, and can select an available network.

Meanwhile, the call processing method of the 3G mobile communication system supporting the SCC according to the embodiment of the present invention may be implemented in the form of a program command that can be executed through a variety of means for processing information electronically and recorded in a storage medium. The storage medium may include program instructions, data files, data structures, and the like, alone or in combination.

Program instructions to be recorded on the storage medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of software. Examples of storage media include magnetic media such as hard disks, floppy disks and magnetic tape, optical media such as CD-ROMs and DVDs, magneto-optical media such as floptical disks, magneto-optical media and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. The above-mentioned medium may also be a transmission medium such as a light or metal wire, wave guide, etc., including a carrier wave for transmitting a signal designating a program command, a data structure and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as devices for processing information electronically using an interpreter or the like, for example, a high-level language code that can be executed by a computer.

The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

110:
120:
130: Media gateway control function
140: call session control function
150: SCC application server
160: Home subscriber server

Claims (7)

A 3G switching center for routing the location registration request when the location registration from the mobile terminal to the CS domain is requested;
A call session control function for routing a location registration request when the location registration to the IMS PS domain is requested from the mobile terminal;
A home subscriber server which registers the location of the mobile terminal according to the location registration requests and transmits location registration information of the mobile terminal according to the location registration; And
An SCC application server for storing location registration information of the mobile terminal received from the home subscriber server;
And a mobile communication system supporting the SCC.
delete The method according to claim 1,
Wherein the mobile terminal is a terminal supporting an IMS function.
The method according to claim 1,
Wherein the home subscriber server transmits the location registration information of the mobile terminal to the SCC application server through an SIP message.
A method for implementing an SCC function in a 3G mobile communication system,
(a) if a location registration request from a mobile terminal to a CS domain is requested by a 3G mobile switching center, routing the location registration request;
(b) when the call session control function requests location registration from the mobile terminal to the IMS PS domain, routing the corresponding location registration request;
(c) the home subscriber server registers the location of the mobile terminal according to the location registration requests and transmits the location registration information of the mobile terminal according to the location registration; And
(d) the SCC application server storing location registration information of the mobile terminal received from the home subscriber server
Wherein the SCC functionality is implemented in a 3G mobile communication system.
6. The method of claim 5,
Wherein the mobile terminal is a terminal supporting the IMS function.
The method according to claim 6,
The step (c)
And transmitting the location registration information of the mobile terminal to the SCC application server through a SIP message.

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