KR100867447B1 - Apparatus and method of telephone service using data communication network - Google Patents

Abstract

The present invention relates to a method and apparatus for providing a voice call service via a data communication network.

The subscriber is provided with the voice call service through the data communication network to access the data communication network providing the data communication service and to receive the voice call service.

According to an exemplary embodiment of the present invention, a subscriber connects a WiBro network, which is a data communication network that provides portability and mobility, and provides a data communication service, to an IMS network, which is a multimedia network, thereby providing a voice call service (VoIP service) through the WiBro network. ) Is available.

VoIP, WiBro, IMS, Resource Allocation, Call Session Control Function (CSCF)

Description

Apparatus and method of telephone service using data communication network

1 is an exemplary network diagram illustrating a WiBro system interworking with an IMS network according to an embodiment of the present invention.

2 is a structural diagram of a P-CSCF according to an embodiment of the present invention.

3 is a flowchart illustrating a method for providing VoIP service in a WiBro system interworking with an IMS network according to an embodiment of the present invention.

4 is a flowchart illustrating a VoIP service providing method of a WiBro system interworking with an IMS network according to an embodiment of the present invention.

5 is a flowchart illustrating a network resource allocation process according to an embodiment of the present invention.

6 is a flowchart illustrating a radio resource allocation process according to an embodiment of the present invention.

The present invention relates to a method and apparatus for providing a voice call service via a data communication network.

Today, IP-based networks are developed for various purposes. For example, various networks such as a data communication network for providing a data communication service (Internet service) and a multimedia network for providing a multimedia service have been developed. The data communication network may be a WiBro network for providing data communication services to stationary or mobile subscribers, and the multimedia network may be an IMS (IP Multimedia Subsystem) network for providing various multimedia services in a next generation communication environment. Can be.

IMS is defined by three logical core components: session control layer, gateway layer, and application layer. The session control layer consists of servers that enable SIP service, a VoIP service. Function and Home Subscriber Server (HSS).

The CSCF registers the user terminal and plays a role of routing SIP signaling to an appropriate server. The HSS is a centralized database that manages subscriber information by processing functions similar to the HLR (Home Location Register) of mobile communication. The HSS performs functions such as user registration / change management, authentication, authorization, location, session routing, and billing.

The gateway layer handles the ability to connect the IMS network with other heterogeneous networks, such as public switched telephone networks (PSTNs) and other networks, while the application layer is based on SIP-based applications such as gaming, video, and group chat. Application).

The WiBro system is composed of a mobile subscriber station, a RAS (Radio Access Station) that processes base station functions, an access control router (ACR) that performs packet access routing, and an external agent function of Mobile IP. It may be linked with a network, and may be connected to another network (for example, the Internet) to use a high-speed Internet service during regular or mobile portable subscriber station.

Currently, the high speed internet service provided by the WiBro system is only a data communication service such as an internet search service. Therefore, it is necessary to find a way for subscribers to use voice call service (VoIP service) through a WiBro system that supports portability and mobility.

In other words, the subscriber should be connected to a data communication network that currently provides only data communication services, and a method of using various multimedia services (voice call services) should be sought.

On the other hand, the method of minimizing the delay in determining the IP address of the called terminal in the VoIP system providing the VoIP service (Domestic Application No .: 10-2005-0016093) and reflects the bandwidth of the Internet trunk during call signaling (Domestic Application No .: 10-2005-0012052), etc. have been proposed, but these methods are only methods for controlling a call in the existing VoIP system. There is no suggestion on how to use the service.

Accordingly, the present invention is to solve the problems of the prior art as described above, by interfacing the data communication network with the multimedia network to enable the subscriber to use the voice call service (VoIP service) to the voice call service through the data communication network It provides a method and an apparatus thereof.

In addition, the present invention provides a method and apparatus for providing a voice call service through a data communication network that can allocate resources for subscribers of the network that does not provide a voice call service interworking with the IMS network to use the voice call service. to provide.

Method for providing a voice call service over a data communication network according to an aspect of the present invention for achieving the above object,

And transmits the call request message received from the calling party subscriber terminal to the called party subscriber terminal through the second network linked with the first network, wherein the first network is a network that does not provide voice call service. Requesting a call by transmitting a response message to the calling subscriber terminal; Allocating network resources to the calling party subscriber terminal and performing a connection between the terminals such that the calling party subscriber terminal and the called party subscriber terminal are connected through the allocated network resources; A radio resource allocation step of allocating radio resources to the subscriber station when the connection process between the terminals is completed; And setting up a session such that the calling party subscriber station and the called party subscriber station establish a session for providing a voice call service through the allocated radio resource.

The network resource allocation process according to the present invention may include: receiving a request for establishing a network connection from the subscriber station by the first network; And authorizing, by the first network, the network connection by allocating the network resource to the subscriber station.

In the network resource allocation process according to the present invention, a network connection establishment request for the control station of the first network, where the first network includes a control station and a P-CSCF, requests network connection establishment from the subscriber station. Receiving a message; The control station transmitting a network connection establishment request message to the P-CSCF, and transmitting, by the P-CSCF, a network connection establishment permission message allowing the network connection establishment to the control station; The control station allocating a network resource to the subscriber station based on a network connection establishment permission message that network connection establishment is permitted, and notifying the P-CSCF of the result; And transmitting, by the control station, a network connection establishment complete message indicating that network connection establishment has been completed to the subscriber station.

An apparatus for providing a voice call service through a data communication network according to another aspect of the present invention,

The first network, where the first network is a network that does not provide voice call service, interworks with the second network, and allocates network resources when there is a request for establishing a network connection from a plurality of subscriber stations accessing the wireless network. When the calling party subscriber terminal is connected to the receiving subscriber station through the network resource, the radio resource of the session that can exchange voice packets for voice call service by allocating radio resources to the calling party subscriber station and the receiving subscriber station. P-CSCF to allocate; And a plurality of signaling messages received for the VoIP service from the respective subscriber stations connecting to the P-CSCF from the P-CSCF and the signaling messages received from the P-CSCF. And a control station, wherein the P-CSCF includes a message processing unit for transmitting a SIP signaling message received from the calling party subscriber station to the called party subscriber station, the calling party subscriber station requesting a voice call, and the called party. A resource allocator for allocating network resources and radio resources to a subscriber station and a storage unit for storing the network resource and radio resource information allocated by the resource allocator.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

In the embodiment of the present invention, an IMS network and a WiBro system among data communication networks will be described as examples.

1 is an exemplary network diagram illustrating a WiBro system interworking with an IMS network according to an embodiment of the present invention.

As shown in FIG. 1, a plurality of IMS networks (also referred to as second networks) 100 are connected to WiBro networks (also referred to as first networks) 200-1 and 200-2. The IMS network 100 includes an I / S-CSCF 110 that manages subscriber information, and also includes components such as HSS (not shown), which are essential components of the other IMS network 100.

The WiBro networks 200-1 and 200-2 are connected to a plurality of Radio Access Stations (RAS) 210 in which a plurality of Portable Subscriber Stations (PSS) 300, which are portable by subscribers, perform a base station function. A router 230 for routing packets, an access control router 220 for performing a packet access routing function, and an external agent function of mobile IP, and an IMS network that is a heterogeneous network ( P-CSCF (Proxy Call Session Control Function) 240 interworking with 100 is interworked.

In the following detailed description, detailed descriptions of the components of the IMS network 100 and the WiBro networks 200-1 and 200-2 which are not related to the present invention will be omitted. In the embodiment of the present invention, the WiBro network is taken as an example of a data communication network, and the IMS network is described as an example of a multimedia network. However, the present invention is not necessarily limited thereto and may be similarly applied to other networks.

The P-CSCFs 240 of the WiBro networks 200-1 and 200-2 are connected to the I / S-CSCF 110 of the IMS network 100 interworking with each other and the I / S-CSCF of the IMS network 100. 110 manages subscriber information. In addition, when a signaling for providing a voice call service according to VoIP, for example, a SIP signaling message is received, it is transmitted to the subscriber station 300 as a destination.

In addition, the P-CSCF 240 processes a call control function for establishing a call call according to SIP, a session establishment function, and provides various multimedia services to the subscriber terminal 300. That is, the P-CSCF 240 allows the subscriber station 300 to connect to the IMS network 100 to allocate a session and to establish a call, and to each subscriber station 300, the WiBro networks 200-1 and 200. -2) Allocates network resources and radio resources.

The I / S-CSCF 110 of the IMS network 100 manages the session state of the IMS network 100 and transmits a SIP signaling message to the subscriber station 300 as a destination in association with the HSS. That is, when the SIP signaling message is received, the I / S-CSCF 110 receives the SIP signaling message through the IMS network 100 and the WiBro networks 200-1 and 200-2 to which the subscriber station 300 is connected. The SIP signaling message is transmitted to the subscriber station 300 which is the final destination. The I / S-CSCF 110 may transmit a SIP signaling message to the subscriber station 300 based on the HSS managing location information (location) for each subscriber station 300.

Each subscriber station 300 connected to the WiBro networks 200-1 and 200-2 has a voice input unit (microphone) and a voice output unit (speaker), and generates a voice packet according to the voice input from the subscriber. In accordance with the subscriber's choice, the SIP signaling message is transmitted to the subscriber station 300 as the destination, the network resources of the control station 220 and the P-CSCF 240 and the corresponding WiBro networks 200-1 and 200-2. Radio resources are allocated to exchange voice packets for voice call service.

The WiBro networks 200-1 and 200-2 interwork with the IMS network 100 through the P-CSCF 240, and make a call for voice calls through the IMS network 100 according to SIP in VoIP. By setting, the voice call service is provided.

Next, the P-CSCF 240 which is a component of the WiBro networks 200-1 and 200-2 among the networks described with reference to FIG. 1 will be described in detail with reference to FIG. 2.

2 is a structural diagram of a P-CSCF according to an embodiment of the present invention.

2 briefly illustrates the function of the P-CSCF 240 according to an embodiment of the present invention, and includes a message processing unit 241 and a message authority verification unit 242.

 The message processing unit 241 transmits the SIP signaling message received from the subscriber station 300 to the counterpart subscriber station through the I / S-CSCF 110 of the IMS network 100. That is, when the SIP signaling message according to the SIP is received from the subscriber terminal 300, the identification information (for example, telephone number, address, etc.) of the counterpart subscriber terminal included in the SIP signaling message is checked. Thereafter, the other subscriber station transmits the SIP signaling message through the connected IMS network 100 and the WiBro networks 200-1 and 200-2.

The message authority verification unit 242 may provide a service to the subscriber station 300 through the allocated resource on the basis of the QoS previously determined for the subscriber station 300 in relation to the resource allocated by the control station 220. Determine whether or not.

Next, a method of providing VoIP service in a system in which an IMS network and a WiBro system interoperate with each other will be described in detail with reference to FIG. 3.

3 is a flowchart illustrating a method for providing VoIP service in a WiBro system interworking with an IMS network according to an embodiment of the present invention.

Referring to FIG. 3, the subscriber station 300 of the calling party sends a P-CSCF 240 of the WiBro networks 200-1 and 200-2 to a call request message INVITE requesting a voice call according to a subscriber's selection. Transmit to (S100). The P-CSCF 240 receiving the call request message transmits a call request message to the I / S-CSCF 110 of the IMS network 100 interworking with the WiBro networks 200-1 and 200-2. The I / S-CSCF 110 transmits a call request message to the subscriber station 300 of the called party (S110).

The subscriber station 300 of the called party transmits a response message to the call request message to the subscriber station 300 of the calling party through the I / S-CSCF 110 of the IMS network 100 (S120). Each subscriber station 300 requests whether to establish a network connection to the control station 220 of the WiBro networks 200-1 and 200-2 during the traffic connection process, and receives network resources from the control station 220 (S130). ).

When the subscriber station 300 of the calling party is allowed to connect according to whether the control station 220 establishes the connection, that is, when the network resource is allocated to the subscriber station 300, the network resource is transferred to the subscriber station 300 of the called party. Notify that the allocation (S140). When the subscriber station 300 of the called party is allocated a network resource from the control station 220 of the corresponding WiBro networks 200-1 and 200-2, and the subscriber station 300 of the calling party is allocated a network resource, The confirmation message is transmitted to the subscriber station 300 of the calling party (S150).

Each subscriber station 300 is allocated a network resource, and requests the base station whether to establish a wireless connection to receive a radio resource (S160). Then, each subscriber station 300 establishes a session when radio resources are allocated, and connects voice traffic for exchanging voice packets through the established session (S170). In addition, each subscriber station 300 provides a voice call service by exchanging voice packets through voice traffic (S180).

4 is a flowchart illustrating a VoIP service providing method of a WiBro system interworking with an IMS network according to an embodiment of the present invention.

Referring to FIG. 4, the calling party's subscriber station 300 connected to the first WiBro network 200-1 is connected to the called party's subscriber terminal 300 connected to the second WiBro network 200-2. A flow of setting up a call call for a voice call will be described.

The subscriber station 300 of the calling party of the IMS network 100 interoperates with the P-CSCF 240 of the WiBro networks 200-1 and 200-2 and the WiBro networks 200-1 and 200-2. The INVITE message, which is a call request message, is transmitted to the subscriber station 300 of the called party through the I / S-CSCF 110 (S200). At this time, the I / S-CSCF 110 of the IMS network 100 and the P-CSCF 240 of the WiBro networks 200-1 and 200-2 transmit SIP signaling messages to respective subscriber stations 300 as destinations. do. Here, the INVIE message includes quality of service (QoS) information of the voice call.

The subscriber station 300 of the called party transmits QoS information about the session to the subscriber station 300 of the calling party based on the QoS information included in the INVTE message received from the calling party terminal 300 (S210). . In this case, the subscriber station 300 of the called party transmits the message through a 183 session progress message. In this case, the matter about the SIP signaling message is already known, and a detailed description thereof is omitted in the embodiment of the present invention.

If there is a change in the QoS information of the session received from the subscriber station 300 of the called party, the calling party's terminal 300 transmits a PRACK message to the subscriber station 300 of the called party (S220). When the called party's subscriber station 300 receives the PRACK message from the calling party's subscriber station 300, the called party's subscriber station 300 transmits a 200 OK message, which is a receipt confirmation message of the PRACK message, to the calling party's subscriber station 300 (S230).

When the call request process (INVITE method) is completed through such a process, a traffic connection process for reserving network resources and radio resources is initiated in the resource setting step of the session establishment process. When the call request process is performed, each subscriber station 300 performs a network resource allocation process (admitted mode) to which network resources are allocated (S240 and S245).

A network resource allocation process performed in S240 and S245 will be described with reference to FIG. 5.

5 is a flowchart illustrating a network resource allocation process according to an embodiment of the present invention.

As shown in FIG. 5, each subscriber station 300 requests DSA-REQ (Dynamic) to request a network connection to the control station 220 of the WiBro networks 200-1 and 200-2 to which the subscriber station is connected. Service Addition-REQuest) message is transmitted (S241).

When the control station 220 receives the DSA-REQ message from the subscriber station 300 (S241), the control station 220 transmits a request message requesting the P-CSCF 240 to grant the network connection. Here, the request message is requested (S242) through a REQ message which is a message according to the Common Open Policy Service (COPS) protocol.

When the P-CSCF 240 receives the request message for requesting permission to establish a network connection, the P-CSCF 240 allocates a network resource and transmits a DEC message for allowing the connection to be established to the control station 220 (S243). When the control station 220 receives the DEC message from the P-CSCF 240, it notifies the P-CSCF 240 through the RPT message that the network connection establishment is normally permitted (S244).

When the permission for the connection establishment request is normally made, the control station 220 informs the subscriber station 300 through the DSA-REP message informing that the connection establishment is completed (S245). When the subscriber station 300 normally receives the DSA-RSP message, the subscriber station 300 transmits a DSA-ACK message, which is a reception confirmation message, to the control station 220 (S246). That is, each subscriber station 300 establishes a connection by receiving network resources of the WiBro networks 200-1 and 200-2 from the P-CSCF 240.

On the other hand, as shown in Figure 4, the subscriber station 300 of the calling party is assigned to the network resources of the WiBro network (200-1, 200-2) connected to the P-CSCF 240, for the network resources The setup is transmitted to the subscriber station 300 of the called party through the UPDATE message (S250). When the subscriber station 300 of the called party receives the UPDATE message normally, the subscriber station 300 transmits a 200 OK message, which is a reception confirmation message, to the subscriber station 300 of the calling party (S260). Thereafter, the subscriber station 300 of the called party transmits a ring message 180 ringing to the subscriber station 300 of the calling party (S270).

When the calling party's subscriber station 300 receives the ring message from the called party's subscriber station 300, it transmits a PRACK message to the called party's subscriber station 300 in response to the ring message (S280). The subscriber station 300 transmits a 200 OK message, which is a reception acknowledgment message for the PRACK message, to the subscriber station 300 of the calling party (S290). Such ring message, PRACK message and 200 OK message are repeatedly transmitted and received until the voice call is established.

Finally, each subscriber station 300 performs a radio resource allocation process (active mode) for exchanging voice traffic in the state of being connected with the P-CSCF 240 (S300 and S305). The radio resource allocation in steps S300 and S305 described above will be described in detail with reference to FIG. 6.

6 is a flowchart illustrating a radio resource allocation process according to an embodiment of the present invention.

Referring to FIG. 6, the P-CSCF 240 transmits a DEC message for allowing wireless connection establishment to the control station 220 (S301). When the control station 220 receives the DEC message from the P-CSCF 240, each subscriber station receives a DSC-REQ (Dynamic Service Change-REQuest) message requesting (notifying) the radio connection setting of each subscriber station 300. Transmit to 300 (S302).

When each subscriber station 300 is notified of the radio connection setting from the control station 220, the subscriber station 300 transmits a DSC-ACK message that is a response message to the control station 220 (S303). When the control station 220 normally receives the DSC-ACK message from each subscriber station 300, it notifies the P-CSCF 240 of the normal operation through the RPT message (S304).

When the P-CSCF 240 receives the RPT message from the control station 220, the P-CSCF 240 transmits a 200 OK message, which is a reception acknowledgment message, to the subscriber station 300 of the calling party, and the subscriber station 300 of the calling party normally sessions. If this is set, as shown in FIG. 4, an ACK message which is a confirmation message is transmitted to the subscriber station 300 of the called party (S310).

In the above detailed description of the present invention, the case where each subscriber station is connected to a different WiBro network has been described, but it can be seen that the same applies to the case where each subscriber station is connected to the same WiBro network.

In addition, in the detailed description of the present invention has been described in the case of providing a voice call service according to VoIP by interworking the WiBro system with the IMS network, it can be seen that the same also when providing other multimedia services.

Here, a program for realizing a function corresponding to the configuration of the above-described embodiment of the present invention or a recording medium on which the program is recorded is also included in the scope of the present invention.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, the subscriber may be provided with a voice call service through the data communication network. That is, the WiBro system and the IMS network may interwork to provide a VoIP service, which is a voice call service, to a subscriber accessing the WiBro system.

In addition, the subscriber may set voice traffic for exchanging voice packets for providing a voice call service through a SIP signaling process, and use various multimedia services through a WiBro system.

Claims (13)

In the method for providing a voice call service, And transmits the call request message received from the calling party subscriber terminal to the called party subscriber terminal through the second network linked with the first network, wherein the first network is a network that does not provide voice call service. Requesting a call by transmitting a response message to the calling subscriber terminal; Allocating network resources to the calling party subscriber terminal and performing a connection between the terminals such that the calling party subscriber terminal and the called party subscriber terminal are connected through the allocated network resources; A radio resource allocation step of allocating radio resources to the calling party subscriber station and the called party subscriber station when the connection process between the terminals is completed; And Setting up a session such that the calling party subscriber station and the called party subscriber station establish a session for providing a voice call service through the allocated radio resource; Voice call service providing method comprising a. The method of claim 1, The step of performing the connection between the terminals Receiving a network connection establishment message from the calling subscriber terminal; And Allocating the network resource to the calling party subscriber station to allow network connection establishment; Voice call service providing method comprising a. The method of claim 1, The step of performing the connection between the terminals, A network connection establishment request message for requesting a network connection setup from the calling subscriber terminal by the control station of the first network, wherein the first network includes a control station and a proxy call session control function (P-CSCF) Receiving; Sending, by the control station, a network connection establishment request message to the P-CSCF, and transmitting, to the control station, a network connection establishment permission message allowing the P-CSCF to allow network connection establishment; The control station allocating a network resource to the calling party subscriber terminal based on a network connection establishment permission message that network connection establishment is permitted, and notifying the P-CSCF of the result; And The control station transmitting a network connection establishment complete message indicating that network connection establishment is complete to the calling party subscriber station; Voice call service providing method comprising a. The method of claim 3, The network connection establishment request message is transmitted to the P-CSCF through a request message according to a common open policy service (COPS) protocol. The method of claim 1, The radio resource allocation step, When the first network completes the connection process between the terminals, allocating radio resources to the calling party subscriber station and the called party subscriber station and notifying a wireless connection setting; And Receiving, by the first network, a response to the notification of the radio connection setting from the calling party subscriber station and the called party subscriber station; Voice call service providing method comprising a. I The method of claim 1, The radio resource allocation step, Sending, by the P-CSCF of the second network, wherein the second network includes a P-CSCF and a control station, to the control station a radio connection establishment permission message allowing the establishment of a radio connection; The control station notifying the originating subscriber terminal of a radio connection establishment permission message, and the control station receiving a radio connection establishment permission message from the calling party subscriber terminal; And The control station notifying the P-CSCF of the normal operation from the calling subscriber terminal through an RPT message; Voice call service providing method comprising a. The method according to any one of claims 1 to 6, The first network is a WiBro network, and the second network is an IP Multimedia Subsystem (IMS) network. delete delete delete delete delete delete

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