KR20100030272A - Access gateway system and call handling method thereof - Google Patents

Abstract

PURPOSE: An access gateway system and a call handling method thereof are provided to supply a call connection service to subscribers when an AGW can not communicate with an MGC(Media Gateway Controller), thereby providing a more secured VoIP service. CONSTITUTION: A call connection request message is received(S100). An access gateway decides whether to communicate with an MGC(S102). If the communication is impossible, the call connection request message is transmitted. It is determined whether a receiver is a subscriber of an access network(S108). A call connection service is provided(S110).

Description

ACCESS GATEWAY SYSTEM AND CALL HANDLING METHOD THEREOF

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an access gateway (AGW) system and a call processing method thereof, and more particularly to a local media gateway controller (MGC) inside an access network. By including the AGW with the function of), it is possible to prevent the inability of all the subscribers in the entire access network, which occurs when the AGW is unable to communicate with the MGC outside the access network due to network failure, failure of the MGC itself, etc. The call connection service between access network subscribers relates to an AGW system and a call processing method for providing the same smoothly.

Recently, a network structure has been switched from a circuit switched method to a packet switched method. However, since the switching is still in progress, a technology related to connection between a circuit-switched network and a packet-switched network is inevitably required.

In general, a device that connects networks having different communication methods is called a gateway, and in particular, a media gateway is a network device that processes media data as well as a call processing signaling protocol. It is the core equipment of 'VoIP'. Media gateways can be classified into residential gateways, access gateways, and trunking gateways according to their location and required services.

Among the media gateways, the Access Gateway (AGW) related to the present invention provides an integrated service by accommodating various subscribers such as a general telephone, xDSL, and a dedicated line in a single platform. In more detail, the analog voice signal of the subscriber connected to the AGW is converted into a digital signal and transmitted to the other subscriber, and the digital signal from another subscriber is converted into analog voice and transmitted to the receiving subscriber.

In this case, a network to which one or more AGWs and subscribers are connected is called an access network.

If the AGW is a hardware that connects networks with different communication methods, MGC is the software that controls the AGW. The communication between the two uses standard interfaces such as MGCP and MEGACO. The reason why hardware and software are not included in a single device, such as a PSTN switch, is to make it easier to accept new services when they are required.

Because AGW and MGC exist in different spaces, there is a problem that AGW does not operate at all when communication between AGW and MGC is not smooth. Since the AGW operates under the control of the MGC, there is a problem that all subscribers of the network including the AGW cannot connect the call to each other as well as the call between the subscribers. And, the more lines the AGW processes, the more the communication range becomes impossible when the AGW and the MGC cannot communicate.

The present invention is to solve the above-mentioned problems, to minimize the problem of communication loss by providing a call connection service between subscribers of the network connected to the AGW even in a situation where the AGW is unable to communicate with the MGC existing outside the access network Its purpose is to provide an AGW system and a call processing method thereof.

Call processing method of the AGW system according to an aspect of the present invention, the AGW receives a call connection request message from the subscriber, the AGW determines whether the communication with the pre-matched MGC, AGW communication with the MGC Transmitting a call connection request message to the MGC if possible; transmitting a call connection request message to the local MGC-containing AGW using the information of the pre-stored local MGC-containing AGW when the AGW cannot communicate with the MGC, including the local MGC After receiving the call connection request message, the AGW determines whether the receiver is a subscriber of an access network, and then provides a call connection service using a local MCC only when the subscriber is a subscriber.

According to another aspect of the present invention, the AGW system receives a call connection request message from a subscriber of an access network, transmits a call connection request message to the MGC when communication with the MGC is possible, and connects to a AGW including a local MGC when communication with the MGC is impossible. The AGW sending the request message and the AGW including the local MMG providing the call connection service using the local MMG only when the subscriber is determined after receiving the call connection request message from the AGW and determining whether the receiver is a subscriber of the access network.

According to the AGW system and the call processing method of the present invention described above, even when the AGW is unable to communicate with the MGC, it is possible to provide call connection service between subscribers of the network connected to the AGW, thereby providing more stable VoIP service to the subscribers of the access network. Can provide.

Hereinafter, an AGW system and a call processing method according to the present invention will be described in detail with reference to the accompanying drawings. In addition, it should be noted that the same reference numerals are given to the same elements, although belonging to different drawings for convenience of understanding.

1 is a flowchart illustrating a call processing method of an AGW system according to an embodiment of the present invention.

The subscriber of the access network transmits a call connection request message (S100). The called party may be a subscriber station of the same access network or a terminal belonging to another network.

The AGW in charge of the subscriber line receives the call connection request message and determines whether communication with the MGC is possible (S102). Preferably, location information such as an IP (Internet Protocol) address of the MGC is stored in advance. In addition, the MGC is preferably included in a network other than the access network to which the AGW belongs.

When communication with the MGC is possible (S102), the call connection request message is transmitted to the MGC (S104). At this time, the communication protocol between the AGW and the MGC may use any one or more of Session Initiation Protocol (SIP), Media Gateway Controller Protocol (MGCP), and MEGACO (H.248).

If communication with the MGC is impossible (S102), the AGW receiving the call connection request message of the subscriber transmits the call connection request message to the local MGC including AGW using the stored information of the local MGC including AGW (S106). The local MGC-containing AGW is preferably included in the same access network as the MGC, but may be included in another network through tunneling. The information on the local MGC-containing AGW may be stored in the AGW in advance or may be modified through an administrator interface. At this time, the communication protocol between the AGW and the AGW including the local MGC may use any one or more of Session Initiation Protocol (SIP), Media Gateway Controller Protocol (MGCP), and MEGACO (H.248).

The AGW including the local MCC receives the call connection request message (S106) and determines whether the receiver is an access network subscriber (S108). The determination is preferably made by comparing the subscriber information stored in the AGW including the local MCC with the receiver information included in the call connection request message. If the recipient AGW including the local MCC is not a subscriber of the access network, the AGW preferably transmits a message to the sender indicating that the communication is impossible.

If the receiver is an access network subscriber (S108), the AGW including the local MGC provides a call connection service using the included MGC module (S110). The MGC module included in the local MGC-containing AGW provides a call connection service by controlling the AGW in the access network in the same manner as the conventional MGC for the terminal in the access network. That is, it is preferable that the MGC module included in the local MGC including AGW controls at least one or more access gateways included in the access network to provide a call connection service.

2 is a view showing a connection configuration of an AGW system according to an embodiment of the present invention.

As shown in FIG. 2, the AGW system of the present invention includes a MGC 200, 201, a network 202, a router 203, an AGW 204, 205, an AGW 206 including a local MCC, a terminal 207, 208, 209, 210, 211, 212 and access network 213.

The access network 213 includes a router 203, an AGW 204, 205, an AGW 206 with a local MCC, a terminal 207, 208, 209, 210, 211, 212, as shown in FIG. A network, which has a separate network domain from an external network.

The MGCs 200 and 201 are devices included in a network outside the access network 213 and are connected through the access network 213 and the network 202 and the router 203 so that the AGWs 204 and 205 and the AGW including the local MGCs are connected. Control 206.

The AGWs 204 and 205 receive call connection request messages from terminals 207, 208, 211, and 212 of the line in charge, and provide the call connection service under the control of the MGCs 200 and 201, or the MGC 200 If communication with 201 is not possible, the call connection service is provided under the control of the AGW 206 including the local MCC.

The AGW 206 with the local MGC performs the function of a general AGW, and in addition, the receiver is connected to the access network 213 in case communication between the AGW 204 and 205 and the self 206 and the MGC 200 and 201 is impossible. The call connection service is provided only in the case of belonging terminal. The MGC module included in the local MGC-containing AGW 206 controls the AGW inside the access network in the same manner as the conventional MGC for the terminals 207, 208, 209, 210, 211, and 212 inside the access network 213. To provide call connection services.

Hereinafter, the operation of the AGW system according to the drawing will be described.

The terminal 207 transmits a call connection request message to the AGW 204 in charge of its line. The AGW 204 receives the call connection request message and determines whether communication with the MGCs 200 and 201 is possible. If communication is possible, the call connection request message is transmitted to the MGCs 200 and 201, and in response thereto, the call connection service is provided under the control of the MGCs 200 and 201.

If the communication is not possible, the AGW 204 sends a call connection request message to the AGW 206 including the local MCC.

The local MGC including AGW 206 receives the call connection request message, compares the stored subscriber network 213 subscriber information with information of the receiver included in the call connection request message, and the terminal belongs to the access network 213. Determine if it is. If the receiver is a terminal belonging to the access network 213, the AGW 206 including the local MCC controls the AGW 204 to provide a call connection service.

If the receiver is not a terminal belonging to the access network 213, the AGW 206 including the local MCC transmits a message to the call connection request message transmitting terminal indicating that the communication to the external network is incapable.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. Will understand. Therefore, the technical protection scope of the present invention will be defined by the claims below.

1 is a flowchart illustrating a call processing method of an access gateway system according to an exemplary embodiment of the present invention.

2 is a diagram illustrating a connection configuration of an access gateway system according to an embodiment of the present invention.

Claims (2)

In the call processing method of the Access Gateway (Access Gateway) system, The access gateway receiving a call connection request message from the subscriber; Receiving, by the access gateway, the call connection request message to determine whether communication with a Media Gateway Controller is possible; Transmitting, by the access gateway, a call connection request message to an access gateway including a local media gateway controller when the communication is impossible; And, The access gateway including the local media gateway controller receives the call connection request message and compares the stored access network subscriber information with the receiver information included in the received call connection request message to determine whether the receiver is a subscriber of the access network. And providing a call connection service by controlling at least one access gateway included in the access network using a local media gateway controller module. An access gateway system, An access gateway that receives a call connection request message from a subscriber of an access network and transmits a call connection request message to an access gateway including a local media gateway controller when communication with the media gateway controller is not possible; And, Receiving a call connection request message from the access gateway, comparing the stored access network subscriber information with the receiver information included in the received call connection request message to determine whether the receiver is a subscriber of the access network, and then, if the receiver is a subscriber of the access network, An access gateway system comprising a local media gateway controller access gateway providing a call connection service by controlling one or more access gateways included in the access network using a media gateway controller module.

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