KR101487518B1 - Access gateway system and call handling method thereof - Google Patents

Abstract

The present invention relates to an access gateway system including a local media gateway controller and a call processing method thereof and includes an access gateway including a local media gateway controller in an access network, An access gateway system that provides a call connection service between subscribers of an access network using an access gateway including a local media gateway controller even when communication with a media gateway controller existing outside the access network is impossible, ≪ / RTI >

MGC, AGW, MEGACO, local MGC

Description

[0001] ACCESS GATEWAY SYSTEM AND CALL HANDLING METHOD THEREOF [0002]

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 an access gateway (hereinafter referred to as 'AGW' The AGW includes the AGW including the function of the AGW. This prevents a call disabled state of all subscribers of the access network that occurs when the AGW becomes unable to communicate with the MGC existing outside the access network due to a network failure, a failure of the MGC itself, An AGW system for smoothly providing a call connection service between access network subscribers and a call processing method thereof.

Recently, the communication network structure has been switched from a circuit switched system to a packet switched system. However, since the above-mentioned switching is still in progress, a technology relating to the connection of the circuit switching type network and the packet switching type network is inevitably required.

In general, a device for connecting networks having different communication methods is called a gateway. Among them, a media gateway is a network device that processes not only a call processing signal protocol but also media data, VoIP "). The media gateway can be divided into a Residential Gateway, an Access Gateway, and a Trunking Gateway depending on the location in the communication network and the required service.

Among the media gateways, the Access Gateway (AGW) related to the present invention provides various integrated services such as general telephone, xDSL, and leased line by accommodating various subscribers on a single platform. More specifically, the analog voice signal of the subscriber connected to the AGW is converted into a digital signal and transmitted to another subscriber. Further, the digital signal received from another subscriber is converted into analog voice and transmitted to the receiving subscriber.

At this time, a network in which one or more AGWs and subscribers are connected is called an access network.

If the AGW is hardware that connects networks with different communication methods, the MGC is the software that controls the AGW. A standard interface such as MGCP or MEGACO is used for communication between the two. The reason why hardware and software are not included in a single device, such as a conventional PSTN switcher, is to make it easier to accommodate new services when new services are required.

Since AGW and MGC exist in different spaces, there is a problem that AGW does not operate at all if communication between AGW and MGC is not smooth. The AGW operates under the control of the MGC, so that not only all the subscribers of the network including the AGW can connect to the outside, but also the subscriber can not connect to the call. If the AGW and the MGC are unable to communicate with each other as the number of lines handled by the AGW increases, the range of the inability to talk further increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a call connection service between subscribers of a network connected to an AGW even in a situation where the AGW can not communicate with an MGC existing outside the access network, And a method of processing the call.

A method of processing an AGW system call according to an aspect of the present invention includes the steps of receiving a call connection request message from a subscriber, determining whether the AGW can communicate with an MGC that has been matched in advance, Transmitting a call connection request message to the MGC if possible, and transmitting a call connection request message to the AGW including the function of the local MGC using the information of the AGW including the function of the local MGC stored in advance if the AGW can not communicate with the MGC The AGW including the function of the local MGC receives the call connection request message and determines whether the receiver is a subscriber of the access network and provides a call connection service using the local MGC only when the subscriber is a subscriber do.

The AGW system according to another aspect of the present invention receives a call connection request message from a subscriber of the access network and transmits a call connection request message to the MGC when communication with the MGC is possible and includes a function of the local MGC when communication with the MGC is impossible AGW for transmitting a call connection request message to the AGW and a function of a local MGC for receiving a call connection request message from the AGW and determining whether the receiver is a subscriber of the access network and providing a call connection service using the local MGC only when the receiver is a subscriber Lt; / RTI >

According to the AGW system and the call processing method of the present invention, it is possible to provide a call connection service between subscribers of a network connected to the AGW even when the AGW can not communicate with the MGC, thereby providing a more stable VoIP service to subscribers of the access network .

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. Also, for ease of understanding, it should be noted that the same elements are given the same reference numerals even though they belong to different drawings.

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 (SlOO). The recipient of the call may be a subscriber terminal of the same access network or a terminal belonging to another network.

The AGW responsible for the line of the subscriber receives the call connection request message and determines whether communication with the MGC is possible (S102). It is preferable that location information such as IP (Internet Protocol) address of the MGC is stored in advance. It is also preferable that the MGC is included in a network other than the access network to which the AGW belongs.

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

In the case where communication with the MGC is impossible (S102), the AGW that has received the call connection request message of the subscriber uses the information of the AGW including the function of the stored local MGC to transmit a call connection request message to the AGW including the function of the local MGC (S106). The AGW including the function of the local MGC is preferably included in the same access network as the MGC, but may be included in another network through tunneling. The AGW information including the function of the local MGC may be stored in advance in the AGW or may be modified through an administrator interface. At this time, the communication protocol between the AGW and the AGW including the functions of the local MGC can use at least one of SIP (Session Initiation Protocol), MGCP (Media Gateway Controller Protocol), and MEGACO (H.248).

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

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

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

2, the AGW system of the present invention includes MGCs 200 and 201, a network 202, a router 203, AGWs 204 and 205, an AGW 206 including functions of a local MGC, Terminals 207, 208, 209, 210, 211, 212, and an access network 213.

The access network 213 includes a router 203, AGWs 204 and 205, an AGW 206 including functions of a local MGC, terminals 207, 208, 209, 210, 211 and 212 ), And has a network domain that is separate from the external network.

The MGCs 200 and 201 are devices included in a network outside the access network 213 and are connected to the access network 213 via the network 202 and the router 203 to function as the functions of the AGWs 204 and 205 and the local MGC Lt; RTI ID = 0.0 > 206 < / RTI >

The AGWs 204 and 205 receive call connection request messages from the terminals 207, 208, 211 and 212 of their respective lines and provide call connection services under the control of the MGCs 200 and 201, , 201 is not available, it provides the call connection service under the control of the AGW 206 including the function of the local MGC.

The AGW 206 including the function of the local MGC performs a general AGW function and in addition, when communication between the AGWs 204 and 205 and the MG 206 itself and the MGC 200 and 201 is impossible, The call connection service is provided only in the case of a terminal belonging to the terminal 213. The MGC module included in the AGW 206 including the function of the local MGC is connected to the terminals 207, 208, 209, 210, 211 and 212 in the access network 213 in the same manner as the conventional MGC, And controls the internal AGW to provide a call connection service.

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

The terminal 207 transmits a call connection request message to the AGW 204 responsible for its own line. The AGW 204 receives the call connection request message and determines whether communication with the MGC 200 or 201 is possible. If it is possible to communicate, it sends a call connection request message to the MGCs 200 and 201, and provides a call connection service under the control of the MGCs 200 and 201 in response thereto.

If the communication is not possible, the AGW 204 sends a call connection request message to the AGW 206, which includes the function of the local MGC.

The AGW 206 including the function of the local MGC receives the call connection request message and compares the information of the recipient included in the call connection request message with the previously stored access network 213 subscriber information, ) Of the terminal. If the receiver is a terminal belonging to the access network 213, the AGW 206 including the function of the local MGC 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 function of the local MGC transmits a message to the call connection request message transmission terminal indicating that communication is impossible to the external network.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

1 is a flowchart illustrating a call processing method of an access gateway system according to an 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)

A method for processing a call in an access gateway system, The access gateway receiving a call connection request message from a subscriber; Receiving, by the access gateway, the call connection request message and determining whether communication with the media gateway controller is possible; The access gateway transmitting a call connection request message to an access gateway including the function of the local media gateway controller when the communication is impossible; And The access gateway including the function of the local media gateway controller determines whether the receiver is a subscriber of the access network by receiving the call connection request message and comparing the receiver network information included in the received call connection request message with the stored access network subscriber information Providing a call connection service by controlling one or more access gateways included in an access network using a local media gateway controller module only when the subscriber is a subscriber; The access gateway system comprising: In an access gateway system, An access gateway for receiving a call connection request message from a subscriber of the access network and transmitting a call connection request message to an access gateway including a function of the local media gateway controller when communication with the media gateway controller is impossible; And Receiving a call connection request message from the access gateway, comparing the stored access network subscriber information with recipient information included in the received call connection request message to determine whether the receiver is a subscriber of the access network, An access gateway comprising a function of a local media gateway controller for providing call connection services by controlling one or more access gateways included in an access network using a media gateway controller module.

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