KR100392865B1 - Device and method for interworking between imt-2000 system and pstn - Google Patents

Abstract

The present invention relates to a network interworking device between an International Mobile Telecommunication (IMT) -2000 system and a PSTN and a method thereof, and more particularly, a signal of an IMT-2000 switching center is converted into a signal suitable for a public switched telephone network (PSTN) and transmitted, The present invention relates to an IMT-2000 system and a network interworking device and method thereof for converting a signal suitable for an IMT-2000 switching center and transmitting the same. The present invention provides an interworking function between a next-generation IMT-2000 synchronization system and an existing PSTN. By doing so, there is an excellent effect of enabling a call between an IMT-2000 subscriber and a PSTN subscriber.

Description

Network interworking device between IMT-2000 system and PSN and method therefor {DEVICE AND METHOD FOR INTERWORKING BETWEEN IMT-2000 SYSTEM AND PSTN}

The present invention relates to a network interworking device and a method between an International Mobile Telecommunication (IMT) -2000 system and a Public Switched Telephone Network (PSTN). Is a network interworking device and method between an IMT-2000 system and a PSTN that converts a signal of an IMT-2000 switching station into a signal suitable for a PSTN and transmits a PSTN signal to a signal suitable for an IMT-2000 switching station. It is about.

Conventionally, since a device and an algorithm for providing an interworking function between a next-generation IMT-2000 synchronization system and a conventional PSTN are currently being developed, there is a problem in that a voice call between an IMT-2000 subscriber and a PSTN subscriber is impossible.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is a network between an IMT-2000 system and a PSTN to enable a call between a subscriber of a next generation IMT-2000 synchronization system and an existing PSTN subscriber. An interworking device and a method thereof are provided.

In order to achieve the above object, when the IMT-2000 system and the PSN network interworking device of the present invention receive ATM data from the switching center of the IMT-2000 network, the header part of the IMT-2000 system decrypts the header part and converts the data into an internal format data. On the other hand, ATM interface card for converting the data received by the parameter value change in the IMT-2000 environment to ATM data to transmit to the switching center;

When receiving an ISUP message from the PSTN, an ISDN interface card that decrypts the header and converts the data into an internal format and transmits the data, while converting the data into a PSTN environment by converting it into an ISUP message and transmitting it to the PSTN. An echo canceller connected between the ATM interface card and the ISDN interface card by an IPC connection to perform a message processing speed improvement and a message echo cancellation function of the ATM interface card and the ISDN interface card; And

Perform a call processing function between the switching center of the IMT-2000 network and the PSTN, and when receiving data in block units from the ATM interface card, converts the parameter values of the data into the PSTN environment and transmits the data to the ISDN interface card; When receiving data in units of blocks from the ISDN interface card, it is characterized in that the main call control means for converting the parameter value of the data to the IMT-2000 environment and then transmitted to the ATM interface card.

In addition, the IMT-2000 system and the PSTN call processing method of the network interworking method between the IMT-2000 system of the present invention, the main call control means, the eleventh step of receiving a call setup message from the switching station of the IMT-2000 network;

A twelfth step of transmitting, by the main call control means, the response signal of the call setup message to the switching center and the call setup message to the PSTN;

A thirteenth step, wherein the main call control means determines whether a call setup confirmation message has been received from the PSTN;

In a thirteenth step, when the call setup confirmation message is received from the PSTN, the main call control means sends the call setup confirmation message to the switching center;

A fifteenth step, wherein the main call control means determines whether a called party's call connection message has been received from the PSTN within a set time;

In the fifteenth step, when the called party's call connection message is received from the PSTN within the set time, the main call control means transmits the called party's call connection message to the switching center to receive the call between the calling party of the IMT-2000 environment and the PSTN environment. A sixteenth step of connecting a call between side subscribers;

A seventeenth step, wherein said main call control means determines whether a call release message has been received from said switching center or a PSTN;

If the call release message is not received from the switching station or the PSTN in step 17, the process proceeds to step 17 again. If a call release message is received from the switching station or the PSTN, the main call control means exchanges between the switching station and the PSTN. An eighteenth step of releasing the call; And if the call setup confirmation message is not received from the PSTN in the thirteenth step, or if the called party's call connection message is not received from the PSTN within the set time in the fifteenth step, the main call control means performs a call setup operation. After the termination, the nineteenth step of returning to the eleventh step.

On the other hand, the call processing method of the PSTN to the IMT-2000 system of the present invention IMT-2000 system and the PSN network interworking method, after the main call control means receives a call setup message from the PSTN is transmitted to the switching center of the IMT-2000 A twenty-first step;

A twenty-second step of determining, by the main call control means, whether or not a response signal of a call setup message has been received from the switching center;

In a twenty-third step, when a response signal of a call setup message is received from the switching center, the main call control means determines whether a call setup confirmation message has been received from the switching center;

A twenty-fourth step, if the call setup confirmation message is received from the switching center in the twenty-third step, the main call control means sending the call setup confirmation message to the PSTN;

A twenty-fifth step, wherein the main call control means determines whether a called party's call connection message has been received from the switching center within a set time;

In step 25, when the called party's call connection message is received from the switching center within the set time, the main call control means transmits the called party's call connection message to the PSTN to receive the IMT-2000 environment from the calling party in the PSTN environment. A twenty sixth step of connecting a call between side subscribers;

The twenty-seventh step of determining, by the main call control means, whether a call release message has been received from the switching center or a PSTN;

If the call release message is not received from the switching station or the PSTN in step 27, the flow proceeds to step 27 again. If a call release message is received from the switching station or the PSTN, the main call control means exchanges between the switching center and the PSTN. 28th step of releasing the call; And a response signal of a call setup message is not received from the switching center in the twenty-second step, a call setup confirmation message is not received from the switching station in the twenty-third step, or a call is received within the set time from the switching station in the twenty-fifth step; If the call connection message is not received, the main call control means comprises a twenty-ninth step of returning to the twenty-first step after completing the call setup operation.

1 is a functional block diagram showing a configuration of an IMT-2000 system and a PSN network interworking device according to an embodiment of the present invention;

2 is an operation flowchart illustrating a call processing method from an IMT-2000 system to a PSTN among an IMT-2000 system and a PSN network interworking method according to an embodiment of the present invention;

3 is a signal flowchart for explaining a call processing method from a switching center according to FIG. 2 to a PSTN;

4 is an operation flowchart showing a call processing method from the PSTN to the IMT-2000 system among the IMT-2000 system and the PSN network interworking method according to an embodiment of the present invention;

5 is a signal flowchart illustrating a call processing method from the PSTN to the IMT-2000 system according to FIG. 4.

<Explanation of symbols for the main parts of the drawings>

100: ATM interface card 200: ISDN interface card

300: main call control means 400: echo canceller

Hereinafter, an IMT-2000 system and a PSN network interworking device and a method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a functional block diagram of an IMT-2000 system and a PSN network interworking device according to an embodiment of the present invention, wherein the IMT-2000 system and a PSNSN interworking device according to an embodiment of the present invention is ATM (Asynchronous Transfer). Mode; hereinafter referred to as "ATM." Interface Card (100), ISDN (Integrated Service Digital Network; hereinafter referred to as "ISDN") Interface Card 200, Main Call Control ) Means 300, and echo canceller 400.

When the ATM interface card 100 receives ATM data from the switching center 1 of the IMT-2000 network, the ATM interface card 100 decodes a header portion and converts the header portion into internal format data in units of blocks. And transmits the data of the internal format whose parameter value is changed from the main call control means 300 to the IMT-2000 environment, converts the data into ATM data and transmits the data to the switching center 1. Do it.

In addition, when the ISDN interface card 200 receives an Integrated Service Digital Network User Part (ISP) message from the PSTN 2, the ISDN interface card 200 decodes the header part and then decodes the internal format data in units of blocks. Converts the data into the main call control means 300 and transmits the data of the internal format whose parameter value is changed from the main call control means 300 to the PSTN environment, converts the data into an ISUP message and converts the data into an ISUP message. It serves to transmit to.

Meanwhile, the main call control means 300 is implemented as a work station through an Ethernet connection with the ATM interface card 100 and the ISDN interface card 200, so that the switching center of the IMT-2000 network ( 1) is a system for performing a call processing function between the PSTN (2), when receiving data in block units from the ATM interface card 100 converts the parameter value of the data into the parameter value of the PSTN environment and then the ISDN interface While transmitting to the card 200 and receiving data in units of blocks from the ISDN interface card 200, it converts the parameter values of the data into the IMT-2000 environment and transmits the data to the ATM interface card 100. do.

In addition, the echo canceller 400 is connected between the ATM interface card 100 and the ISDN interface card 200 by an Inter Processor Communication (IPC) connection method. 100) and the ISDN interface card 200 serves to improve message processing speed and message echo cancellation.

Next, a description will be given of a network interworking method between the IMT-2000 system and the PSTN according to an embodiment of the present invention using the IMT-2000 system and the PSN network interworking device having the above configuration.

First, a call processing method from the IMT-2000 system to the PSTN among the IMT-2000 system and the PSN network interworking method will be described with reference to FIGS. 2 and 3, but the ATM interface card 100 and the ISDN interface card are described below. The ATM and ISUP message conversion process of 200 will be omitted and will be described only from the standpoint of the main call control means 300.

First, the main call control means 300 receives a call setup message (IAM: Initial Address Message) transmitted from the switching center 1 of the IMT-2000 network through the ATM interface card 100 (S11).

Then, the main call control means 300 transmits an IAM Acknowledge Message (IAA) of the call setup message IAM to the switching center 1 through the ATM interface card 100. Subsequently, the main call control means 300 changes the parameter value of the call setup message IAM received from the switching center 1 to the parameter value of the PSTN environment, and then, via the ISDN interface card 200, the PSTN. Transfer to (2) (S12).

On the other hand, the main call control means 300 determines whether a call setup confirmation message (ACM: Address Complete Message) is received from the PSTN (S13).

At this time, if the call setup confirmation message (ACM) transmitted from the PSTN (2) in the thirteenth step (S13) is received through the ISDN interface card 200 (YES), the main call control means 300 After changing the parameter value of the call setup confirmation message (ACM) to the IMT-2000 network environment and transmits to the switching center 1 through the ATM interface card 100 (S14).

Then, the main call control means 300 determines whether or not a called party's call connection message (ANM) has been received from the PSTN 2 within a set time (S15).

At this time, if the called party's call connection message (ANM) transmitted from the PSTN (2) in the fifteenth step (S15) is received through the ISDN interface card 200 within the set time (YES), the main call control The means (300) changes the parameter value of the called party's call connection message (ANM) to the IMT-2000 network environment and transmits it to the switching center 1 through the ATM interface card 100, thereby transmitting the IMT-2000 environment. A call is connected between the calling party and the called party in the PSTN environment (S16).

Subsequently, after the voice call between the calling / receiving subscribers is connected through the call setting procedure from the eleventh step S11 to the sixteenth step S16, the main call control means 300 is connected to the switching station 1. Alternatively, it is determined whether a call release message (REL: Release Message) is received from the PSTN 2 (S17).

At this time, if the call release message REL is not received from the switching station 1 or the PSTN 2 in the seventeenth step S17 (NO), the main call control means 300 returns to the seventeenth step ( On the other hand, when the call release message is received from the switching center 1 or the PSTN 2 (YES), the main call control means 300 releases the call to the network transmitting the call release message REL. A release message (RLC) is transmitted to another network and a call release message (REL) is transmitted to another network to release the call between the switching station 1 and the PSTN 2 (S18).

On the other hand, the call setup confirmation message ACM is not received from the PSTN 2 in the thirteenth step S13 (NO), or within the set time from the PSTN 2 in the fifteenth step S15. If the called party's call connection message (ANM) is not received (NO), the main call control means 300 returns after finishing the call setup operation (S19).

Meanwhile, a call processing method from the PSTN to the IMT-2000 system among the IMT-2000 system and the PSN network interworking method will be described with reference to FIGS. 4 and 5, but the ATM interface card 100 and the ISDN interface card are described below. The ATM and ISUP message conversion process of 200 will be omitted and will be described only from the standpoint of the main call control means 300.

First, the main call control means 300 receives a call setup message (IAM) transmitted from the PSTN (2) through the ISDN interface card 200, and then IMT the parameter value of the call setup message (IAM) Convert to -2000 network environment. Then, the main call control means 300 transmits the call setup message IAM to the switching center 1 through the ATM interface card 100 (S21).

Subsequently, the main call control means 300 determines whether or not the response signal IAA of the call setup message IAM is received from the switching center 1 (S22).

At this time, when the response signal IAA of the call setup message IAM is received from the switch station 1 in the twenty-second step S22 (YES), the main call control means 300 sends the switch to the switch station 1. From step S23, it is determined whether or not a call setup confirmation message (ACM) has been received.

When the call setup confirmation message (ACM) is received from the switching center 1 (YES) in the twenty-third step (S23), the main call control means 300 sets the parameter value of the call setup confirmation message (ACM) to PSTN. After the change to the network environment, and transmits to the PSTN (2) through the ISDN interface card 200 (S24).

Then, the main call control means 300 determines whether or not the called party's call connection message ANN has been received from the switching center 1 within the set time (S25).

At this time, if the called party's call connection message (ANM) is received from the switching center 1 within the set time (YES) in the twenty-fifth step S25, the main call control means 300 receives the called party's call connection message. After converting the parameter value of the (ANM) to the PSTN network environment, and transmits to the PSTN (2) through the ISDN interface card 200, the call between the calling party subscriber of the PSTN environment and the called party subscriber of the IMT-2000 environment (S26).

Subsequently, the main call control means 300 determines whether a call release message REL has been received from the switching station 1 or the PSTN 2 (S27).

At this time, if the call release message REL is not received from the switching station 1 or the PSTN 2 in step 27 (NO) (NO), the main call control means 300 returns to step 27 (step 27). On the other hand, if the call release message REL is received from the switching center 1 or the PSTN 2 (YES), the main call control means 300 transmits a call release message REL. A call release confirmation message (RLC) is transmitted to the other network and a call release message (REL) is transmitted to another network to release the call between the switching station 1 and the PSTN 2 (S28).

On the other hand, the response signal IAA of the call setup message IAM is not received from the switching station 1 in the twenty-second step S22 (NO), or the switching station 1 in the twenty-third step S23. If no call setup confirmation message (ACM) is received from the terminal (NO) or the called party's call connection message (ANM) is not received within the set time from the switching center 1 in step 25 (S25), The main call control means 300 returns after finishing the call setup operation (S29).

As described above, according to the IMT-2000 system and the PSN network interworking device and the method thereof, the interworking function between the next-generation IMT-2000 synchronization system and the existing PSTN provides a call between the IMT-2000 subscriber and the PSTN subscriber. There is an excellent effect that makes it possible.

Claims (7)

When receiving the ATM data from the switching center of the IMT-2000 network, it decodes the header part, converts the data into the internal format, and transmits the data. When receiving the data whose parameter value is changed in the IMT-2000 environment, the ATM data is converted into the ATM data. An ATM interface card for transmitting to the switching center; When receiving an ISUP message from the PSTN, an ISDN interface card that decrypts the header and converts the data into an internal format and transmits the data, while converting the data into a PSTN environment by converting it into an ISUP message and transmitting it to the PSTN. ; An echo canceller connected between the ATM interface card and the ISDN interface card in an IPC connection manner to perform a message processing speed improvement and message echo cancellation function of the ATM interface card and the ISDN interface card; And Perform a call processing function between the switching center of the IMT-2000 network and the PSTN, and when receiving data in block units from the ATM interface card, converts the parameter values of the data into the PSTN environment and transmits the data to the ISDN interface card; When the block data is received from the ISDN interface card, the IMT-2000 system and the PSTN are configured as main call control means for converting the parameter value of the data into the IMT-2000 environment and transmitting the data to the ATM interface card. Network interlocking device. delete delete An eleventh step of the main call control means receiving a call establishment message from an exchange of an IMT-2000 network; A twelfth step of transmitting, by the main call control means, the response signal of the call setup message to the switching center and the call setup message to the PSTN; A thirteenth step, wherein the main call control means determines whether a call setup confirmation message has been received from the PSTN; In a thirteenth step, when the call setup confirmation message is received from the PSTN, the main call control means sends the call setup confirmation message to the switching center; A fifteenth step, wherein the main call control means determines whether a called party's call connection message has been received from the PSTN within a set time; In the fifteenth step, when the called party's call connection message is received from the PSTN within the set time, the main call control means transmits the called party's call connection message to the switching center to receive the call between the calling party of the IMT-2000 environment and the PSTN environment. A sixteenth step of connecting a call between side subscribers; A seventeenth step, wherein said main call control means determines whether a call release message has been received from said switching center or a PSTN; If the call release message is not received from the switching station or the PSTN in step 17, the process proceeds to step 17 again. If a call release message is received from the switching station or the PSTN, the main call control means exchanges between the switching station and the PSTN. An eighteenth step of releasing the call; And If the call setup confirmation message is not received from the PSTN in the thirteenth step, or if the called party's call connection message is not received from the PSTN within the set time in the fifteenth step, the main call control means ends the call setup operation. And a nineteenth step of returning to the eleventh step, wherein the IMT-2000 system and the PSN are interworking. delete A twenty-first step of the main call control means receiving a call setup message from the PSTN and transmitting it to an exchange of an IMT-2000 network; A twenty-second step of determining, by the main call control means, whether or not a response signal of a call setup message has been received from the switching center; In a twenty-third step, when a response signal of a call setup message is received from the switching center, the main call control means determines whether a call setup confirmation message has been received from the switching center; A twenty-fourth step, if the call setup confirmation message is received from the switching center in the twenty-third step, the main call control means sending the call setup confirmation message to the PSTN; A twenty-fifth step, wherein the main call control means determines whether a called party's call connection message has been received from the switching center within a set time; In step 25, when the called party's call connection message is received from the switching center within the set time, the main call control means transmits the called party's call connection message to the PSTN to receive the IMT-2000 environment from the calling party in the PSTN environment. A twenty sixth step of connecting a call between side subscribers; The twenty-seventh step of determining, by the main call control means, whether a call release message has been received from the switching center or a PSTN; If the call release message is not received from the switching station or the PSTN in step 27, the flow proceeds to step 27 again. If a call release message is received from the switching station or the PSTN, the main call control means exchanges between the switching center and the PSTN. 28th step of releasing the call; And In step 22, a response signal of a call setup message is not received from the switching center, or in step 23, a call setup confirmation message is not received from the switching center, or in step 25, a called party arrives within the set time. And if a call connection message is not received, the main call control means (29) returning to the twenty-first step after completing the call setup operation. delete