KR100194627B1 - How to Provide a User-to-User Exchange Virtual Path Connection at the Recipient User-Network Interface - Google Patents

Abstract

The present invention relates to an asynchronous transmission mode (ATM) switching system, and the conventional subscriber signal protocol (DSS2) originally defined a signaling procedure for establishing a switched virtual channel connection at the originating and destination user-network interface (UNI). For example, each time a calling user requests to establish a switched virtual channel connection, connection control, such as network resource allocation and internal switch paths, must be performed repeatedly, thus establishing multiple virtual channel connections for the same calling and called user. If this is necessary, the overhead of having to repeat the same task and the required quality of service of the virtual channel connection may be different from the quality of service of the virtual channel connection already established in the transport link. To satisfy the new virtual channel connection while maintaining quality Since it is necessary to calculate the required network resources in consideration of all the virtual channels in the transmission link has a disadvantage that requires a lot of time and effort required for the allocation of network resources, the present invention for solving the above disadvantages is the broadband comprehensive information of the own country or another station If the calling subscriber of the telecommunication network (B-lSDN) requires the establishment of a user-user switched virtual path connection between the called subscribers of the local broadband integrated network using the subscriber signaling protocol (DSS2), the called user-network interface, i.e. By providing the user-user exchange virtual path connection between the destination switching system and the destination subscriber, it is possible to provide a virtual channel connection service without performing additional signaling procedure between the calling party and the destination subscriber through the established virtual path connection. .

Description

How to Provide a User-to-User Exchange Virtual Path Connection at the Recipient User-Network Interface

The present invention relates to asynchronous transfer mode (ATM), wherein a transparent connection provided by a conventional ATM layer to a higher tradeoff is called an ATM connection. The ATM connection is terminated by a chain of connection elements. endpoints).

There are two types of ATM connections, a virtual channel (VC) and a virtual path (VP).

The virtual channel refers to a logical unidirectional coupling between link ends carrying an ATM cell, and the virtual path refers to a logical combination of virtual channels.

One virtual channel identifier (VCI) is assigned to each virtual channel, and one virtual path identifier (VPI) is assigned to each virtual path.

According to the above, different virtual channel links may exist in a virtual path connection (VPC), which are distinguished from each other by a virtual channel identification number (VCI) assigned to each of them.

Meanwhile, some virtual channels belonging to different virtual paths may have the same virtual channel identification number.

Therefore, one virtual channel can be fully identified only by combining the corresponding virtual path identification number and the virtual channel identification number.

Next, how to define and configure the virtual channel connection and the virtual path connection, the virtual channel connection (Virtual Channel Connection (VCC)) is a virtual channel to connect between the points connected to the ATM Adaptation Layer (AAL) It refers to the connection of links.

In this case, the virtual channel link refers to a unidirectional virtual connection path for transporting ATM cells between a point where a virtual channel identification number is assigned and a point where the virtual channel identification number is translated or released.

The virtual channel connection (VCC) may be provided via a switching device, or may be provided as a permanent or semi-permanent connection.

Therefore, the following four methods are available for establishing or providing the virtual channel connection (VCC) at the user-network interface (UN).

First, setting or clearing by reservation without going through a signaling procedure, which applies to a permanent or semi-permanent connection.

Second, use meta signaling.

That is, the signal virtual channel is set or released using the meta signal virtual channel VC.

Third, using a user-network signaling procedure, this is a method of using signaling virtual channel connectivity to establish or release virtual channel connectivity (VCC) for end-to-end communication.

Fourth, using the user-user signaling procedure, this is a method of using signaling virtual channel connectivity to establish or release virtual channel connectivity (VCC) inside a preset virtual path connection (VPC) between two user-network interfaces. .

The virtual path link (VPC) refers to the connection of the virtual path links to connect between the point that the virtual path identification number (VPI) is assigned and the point where the virtual path identification number is translated or released.

In this case, the virtual path link refers to a group of virtual channel links between a point where a virtual path identification link is allocated and a point where the virtual path identification link is translated or released.

The virtual path connection (VPC) may be provided through a switching device, or may be provided permanently or semi-permanently.

There are two methods for establishing or releasing a virtual path identification connection between the virtual path identification connection (VPC) endpoints.

Firstly, by way of connection or disconnection without signaling procedure, in this case the virtual path identification connection is established or released by reservation.

Secondly, as a method of connecting or disconnecting as necessary, it is possible to connect or disconnect virtual path identification by user control and network control.

The virtual path VP is a general term referring to a bundle of virtual channel (VC) links, wherein all virtual channel links in the bundle have the same endpoint.

ATM cells are explicitly assigned a virtual path identifier (VPI) for the virtual path, which identifies a group of virtual channel links that share the same virtual path identification connection.

In this case, whenever a virtual path (VP) is exchanged in an ATM network, a specific virtual path identifier (VPI) is assigned.

The virtual path (VP) link refers to the ability of a unidirectional to transport an ATM cell between two ATM entities whose virtual path identifier (VPI) values are translated, and the virtual path (VP) link refers to a virtual path identifier. Occurs by assigning a value and terminates by removing the virtual path identifier.

Accordingly, in the virtual path level, a virtual path identification connection (VPC) is provided for information transfer between user-user, user-network, and network-network.

In addition, when the virtual channel VC is exchanged, the virtual path identification connection supporting the input virtual channel link is terminated first, and a new virtual path identification connection supporting the output virtual channel link is newly created.

Application of the virtual path is as follows.

First, a user-user virtual path identification connection is established between the T _B or S _B reference points and provides the user with a virtual path connection.

ATM network elements transport all cells associated with this virtual path mapping (VPC) over the same route.

Therefore, the corresponding virtual path identifier (VPI) values are translated in ATM network elements that provide cross linking or switching functions.

Secondly, a user-network virtual path identification connection (VPC) is established between the T _B or S _B reference point and the network node and is used to collectively connect user devices to network elements.

Third, the network-to-network virtual path identification connection is established between two network nodes, which is applied to network traffic management or routing.

Therefore, in the network node where the virtual path identification connection (VPC) is terminated, the virtual channels (VC) in the virtual path (VP) are exchanged or cross-connected with the virtual channels in the other virtual path.

On the other hand, the subscriber signaling protocol (DSS2) is a signaling protocol that originally defined a signaling procedure for establishing a switched virtual channel connection at the source and destination user-network interface (UNl).

Since the switched virtual channel connection needs to establish a connection whenever the calling user requests it, it is necessary to repeatedly perform connection control such as network resource allocation and internal switch path.

Therefore, there is overhead to repeat the same task if multiple virtual channel connections need to be established for the same originating and terminating user.

In addition, since the quality of service of the required virtual channel connection is different from the quality of the virtual channel connection that is already set in the transport link, to satisfy the new virtual channel connection while maintaining the service quality of the existing virtual channel connection, Since it is necessary to calculate the required network resources in consideration of all virtual channels, much time and effort are required for network resource allocation.

According to the above, in the past, the virtual path could be set only in the shape of a semi-permanent or permanent virtual path connection by the network manager without a signaling procedure. need. Therefore, there is a problem that a network administrator or user cannot immediately create a new route when needed.

Broadband Bearer Capability (BBC), which is an information element of a SETUP message requiring a virtual connection, in order to add a signaling capability for establishing a virtual path connection to a subscriber signaling protocol (DSS2) to solve the above problem. The virtual path (VP) bearer class is added to the connection identifier, and the connection identifier information element ignores the virtual channel identifier (VCI) and performs only connection control on the virtual path connection identifier (VPCI) value.

That is, if only the virtual path connection identifier (VPCI) value exists in the connection identifier information element and the transmission class of the broadband transmission capability is the virtual path, the exchange virtual path connection establishment procedure is performed. Broadband Connection Oriented Bearer-A, Broadband Connection Oriented Bearer-C, and Broadband Connection Delivery Service In the case of type-X (Broadband Connection Oriented Bearer-X, BCOB-X), the existing virtual channel connection establishment procedure is performed.

1 is a diagram illustrating a relationship between an asynchronous transmission mode (ATM) layer and a physical layer to facilitate understanding of the present invention.

2 is a diagram illustrating a relationship between a virtual path and a virtual channel according to the present invention.

3 is an overall structural diagram of an asynchronous transfer mode (ATM) switching system applied to the present invention.

4 is a main block diagram for performing establishment of a switched virtual path connection in an asynchronous transfer mode (ATM) switching system according to the present invention.

5a to 5f are flow charts for setting up a user-user switched virtual path connection at a called user-network interface according to the present invention.

* Explanation of symbols for main parts of the drawings

100: ALS / Wideband Telecommunication Network Relay Line (ALS / T)

101: subscriber access module (SIM)

102: trunk line connection module (TIM) 103: call connection processing processor (CCCP)

104: connection switching network module (ASNM) 104a: first ASLH

105: Broadband signal connection processing block (BSIF)

106: trunk line service designated coordination processing block (TSCF)

107: MTP signal message processing block (SMHF)

108: trunk line connection block (TCIF)

109: Network link resource processing block (NLRHF)

110: switch link resource processing block (SLRHF)

111: station number translation unit (NTLF) 112: relay line connection control unit (TCCF)

200: ALS / Broadband Integrated Information Network (ALS / S)

201: subscriber access module (SIM) 202: trunk line connection module (TIM)

203 call connection processing processor (CCCP) 204 connection switching network module (ASNM)

204a: second ASLH 205: connectionless server module (CLSM)

206: broadband signal access processing block (BSIF)

207: Service Assigned Coordination Function Block (SSCF)

208: User connection access block (UCIF) 209: User connection control block (UCCF)

210: User link resource management processing block (ULRHF)

211: switch link resource management processing block (SLRHF)

212: National Translation Bureau (NTLF)

300: Asynchronous Transfer Mode Central Switching Subsystem (ACS)

301: Interconnect Exchange Network Module (ISNM)

301a: third ASLH 302: operation maintenance processor (OMP)

303: Number translation block (NTCF) 304: Routing control block (RTCF)

305: MA 306: I / O block

400: Module to Module Interface (IMI)

The present invention relates to an asynchronous transfer mode (ATM) switching system, wherein a calling subscriber of a B-ISDN of a home country or another country uses a subscriber signaling protocol (DSS2) to make a call to a subscriber of the BTS. The present invention relates to providing a user-user switched virtual path connection at an incoming user-network interface when a request for establishing a user-user switched virtual path connection is required.

The switched virtual path connection may be configured by using a subscriber signaling protocol (DSS2) to preset the switched virtual path connection for the subscriber of the broadband integrated network before the subscriber of the broadband integrated network requests the establishment of the virtual channel connection. Allows easy setup of virtual channel connections between them.

In addition, the switched virtual path connection may be established between a user-user, a user-network, and a network-network, and the present invention is particularly useful at the destination user-network interface. We want to provide a user-to-user switched virtual path connection.

In case of establishing a virtual channel connection using the user-user virtual path connection, a connection control procedure for transmitting an ATM cell between a calling party and a called user was performed when establishing a virtual path connection. Is not necessary.

Therefore, the main process (UCCF_main) of the user connection control block that receives an internal call / connection setup request (SETUP_int) message from UCCF_vporg or TCCF_vpict for a request for setting up a user-user virtual path connection initiated by an originating subscriber of another or another station When the internal call / connection establishment request message is analyzed and the result requires the establishment of a user-user exchange virtual path connection between the called party user-network interface, i.e., the called exchange system and the called party, the called user virtual path connection controller Create a process (Destination User Virtual Path Connection Control Child Process, UCCF_vpdes).

The generated UCCF_vpdes allocates the required band and the virtual path connection identifier (VPCI) so that the called user-network interface can establish the required call rate and the required virtual path connection for the VPCI.

After performing the above procedure, an internal switch link path is established for transmission of user information cells within the switching system.

In response to the received internal call / connection setup request (SETUP_int) message, the internal switch link path to the calling user virtual path connection control subprocess (UCCF_vporg) or the incoming trunk virtual path connection control subprocess (TCCF_vpict). After transmitting the switch link information response (SwLinkInfoRP) message including the information, the call / setup request message (SETUP_req) is transmitted to the called subscriber of the host.

According to the above, the called user virtual path connection control subprocess (UCCF_vpdes) receiving the call establishment complete (CONNECT_ind) message from the called party subscriber may control the originating user virtual path connection control subprocess (UCCF_vporg) or the incoming relay line virtual path connection control of the own station. The internal call / connect completion (CONNECT_int) message is sent to the secondary process (TCCF_vpict), where a user-user switched virtual path connection is established between the called exchange system and the called subscriber and the state of the virtual path connection is set to conversation. Transition

In addition, the subscriber connection control block, which is in a busy state by the caller request of the calling party or the called party, performs the release procedure of the virtual path connection, and uses the active band, the virtual path connection identifier (VPCI), and the internal switch link path. Performs the return and deletion of routing tag information.

Hereinafter, described in detail with reference to the accompanying drawings.

3 is an overall structural diagram of an asynchronous transfer mode (ATM) switching system applied to the present invention.

In view of the above structure, the asynchronous transfer mode (ATM) switching system is basically two asynchronous transfer mode local switching subsystem (ALS) and asynchronous transfer mode central switching subsystem (ACS), two It consists of subsystems.

Hereinafter, asynchronous transmission mode local switching subsystem is referred to as ALS and asynchronous transmission mode central switching subsystem is referred to as ACS.

The ALS can operate as a condensing device having a constant condensation ratio together with the ACS.

Thus, the ACS acts as a distribution device that performs the interconnection function between the ALSs.

In addition, the ALS is an ALS / BISDN Subscriber (ALS / BISDN) 200 for registration of a Broadband Telecommunication Network (BISDN) user and an ALS / BISDN relay line (ALS / BISDN) for network matching. Trunk, ALS / T) 100 and ALS / BISDN Subscriber and Trunk (ALS / ST), which accommodates network matching with users.

As the aggregation device according to the above, the ALS / Wideband Telecommunications Network Subscriber (ALS / S) 200 sets the number of links on the user side to n (155 Mbps) and the number of links on the switch (ACS) side to m. It can have a condensation ratio of * m.

Accordingly, the ACS 300 performs the translation of the called number when the local station and the incoming call / connection during the call / connection control, and the route control for each relay line when the outgoing call / connection is performed. do.

In addition, the ACS 300 has an operation maintenance processor (OMP) 302 for the operation and maintenance of the entire system, as well as system-wide maintenance, test, measurement and statistical functions as well as various input and output control functions with the operator. Do this.

FIG. 4 is a block diagram illustrating the configuration of a switched virtual path connection in an asynchronous transfer mode (ATM) switching system according to the present invention.

The entire virtual path connection establishment procedure of the configuration will now be described with reference to FIG. 3.

When the calling subscriber's request for virtual path connection occurs, the calling ALS detects it, performs the virtual path connection service, translates the station number under the control of the calling ALS, and assigns the calling party number translation or outgoing route to the ACS 300. Make a request.

The ACS 300, which has received the above routing request, designates the destination ALS.

The designated destination ALS selects an optimal internal switch link path and notifies the originating ALS, and requests the establishment of a virtual path connection to a destination subscriber of its own station or a destination exchange system of another station.

The originating ALS notified of the optimal internal switch link path information establishes a virtual path connection inside the system.

The outgoing ALS counts the user information cells that pass through the virtual path in the busy state, sends the billing data to the ACS with the service type requested by the user after the call is completed, and the originating / incoming ALS establishes the switched virtual path connection. Return to dormant state.

2 is a diagram illustrating a relationship between a virtual path and a virtual channel according to the present invention, and shows a main call / connection processing block for performing the above-described strong path connection control procedure. Each block is described as follows.

First, the System Library block includes a Switch Link Resource Handling Function (SLRHF) 110, a Number Translation in ALS Funcion (NTLF) 111, and a subscriber link resource. A processing block (User Link Resource Handling function, ULRHF) 210 and a network link resource handling function (NLRHF) 210.

The switch link resource processing block (SLRHF) 110 is a block for generating internal switch link path setting and route designation tag information of an asynchronous transmission mode cell header, and a station number translation block (NTLF). Reference numeral 111 denotes a block for performing a called station number translation, and a user link resource management block (ULRHF) 210 is a block for processing band allocation and band management of a user link at a user-network interface, and network link resource processing. The block NLRHF is a block for processing band allocation and band management of a relay line link at a network-node interface (NNI).

In addition, the Broadband Singnalling Interface Function (BSIF) 105 controls and manages a signaling connection for reliable transmission of B-ISDN call / connection control messages. Function

The subscriber service specific coordination function (SSCF) 207 is a broadband signal access processing unit (BSIF) 105 and a user connection interface block (UCIF) for delivering a subscriber signal message. 208 performs an adjustment function.

The subscriber connection access block 208 performs the access function of a subscriber signaling message.

The Subscriber Connection Control Block (UCCF) 209 also performs subscriber call / connection control.

The trunk service specific coordination function (106) is a broadband signal access processing block (BSIF) 105 and a message transmitter (MTP) signal message processing block (MTP-) in order to transmit the relay line signal message. 3 Signaling Message Handling Function (SMHF) (107) performs an adjustment function.

The message transmission unit (MTP) signal message processing block (SMHF) 107 performs an MTP-3 function among No. 7 signaling methods.

The trunk line connection connection block (Trunk Connection Interface Function, NCIF) 208 is a message transmitter (SMCF) between the message transmitter signal message processing block (SMHF) 107 and the trunk line connection control block (TCCF) ( MTP) signaling message transfer function.

In addition, the trunk line connection control block (TCCF) performs the B / ISDN User Part (BISUP) call / connection control.

There is also a Number Translation in ACS for Caller Number Translation and a Routing Control Function (RTCF) 304 that performs routing designation control.

5A to 5F are flow charts for setting up a user-user switched virtual path connection at a called user-network interface according to the present invention.

Referring to the flow chart described in detail the procedure of providing a user-to-user switched virtual path connection at the destination user-network interface as follows.

First, Figure 5a shows the destination user virtual path connection for performing the establishment of a user-user switched virtual path connection in the main process (UCCF main process, UCCF_main) of the user connection control block (UCCF) 209 at the destination user-network interface. A procedure of generating a control user processor (Destination User Virtual Path Connection Control Child Process, UCCF_vpdes) is shown.

5b to 5f show that the called subscriber virtual path connection control subprocess (UCCF_vpdes) generated by the main process (UCCF_main) of the subscriber connection control block provides a user-user switched virtual path connection at the called user-network interface. The procedure is shown.

Referring to the above procedure, the main process (UCCF_main) of the subscriber connection control block that receives the call / connection setup request (SETUP_int) (S1) message from the originating subscriber or incoming relay line virtual path connection control subprocess (UCCF_vporg or TCCF_vpict) of the local station. ) Analyzes the call / connection establishment request message, and the transmission class (Bearer Class, BS) of the Broadband Bearer Capability (BBC) information element is a virtual path (VP), and the connection identifier information element is virtual. If only the Virtual Path Connection Identifier (VPCI) is included, it is determined that the user-user exchanged virtual path connection is set up and a called subscriber virtual path connection subprocess (UCCF_vpdes) is generated (S3).

However, the call / connection establishment request message may have a BBS information element's class of delivery (BS), a broadband connection-oriented delivery service (A), and a broadband connection-oriented delivery service (COB-A). (Broadband Connection Oriented Bearer Service-C, BCOB-C) or Broadband Connection Oriented Bearer Service-X (BCOB-X), and the Connection Identifier (CID) information element is a virtual path connection identifier (VPCI). ) And a virtual channel identifier (VCI), it is determined that the virtual channel connection is set up, and a destination VC UCCF child process (UCCF_vcdes) is generated (S4).

The subscriber connection control main process is referred to as UCCF_main, the trunk line control control process is referred to as TCCF_main, the incoming subscriber virtual path connection subprocess is referred to as UCCF_vpdes, the outgoing subscriber virtual path connection control process is referred to as UCCF_vporg, and the incoming trunk virtual path connection control unit. The process is referred to as TCCF_vpict and the outgoing trunk virtual path connection control child process is referred to as TCCF_vpogt.

When the generated UCCF_vpdes receives a call / connection setup request (main-to-child SETUP, SETUP_mc) message requesting the establishment of the virtual path connection from UCCF_main (S5), the band and the virtual path connection identifier required for the establishment of the virtual path connection. After assigning (VPCI) (S6), the system library of the switch link resource processing block (SLRHF) is called (S8) in order to establish an internal switch link path between the originating ALS and the terminating ALS (S7).

In addition, UCCF_vpdes transmits a message including a virtual path identifier (VPI) and information for user parameter control (UPC) to a subscriber interface module controller (SIMC) (S9) and waits for a response.

If all of the above procedures are successfully performed, UCCF_vpdes forwards the switch link information response (SwLinkInRP) message to UCCF_vporg or TCCF_vpict (S10) and delivers a call / connection setup request (SETUP_req) message to the called party (S11). Transition to the state (Await_Connect) (S12).

However, if the above procedure fails, UCCF_vpdes sends a switch link information response (SwLinkInfoRP) message to UCCF_vporg or TCCF_vpict and UCCF_vpdes ends.

When the UCCF_vpdes receives the connection completion (CONNECT_ind) from the called subscriber in the connection completion wait state (Await_Connect) (S12) (S13), the setting of the user-user switched virtual path connection requested by UCCF_vporg or TCCF_vpict is set to the called exchange system and the called subscriber. After the internal connection completion (Internal CONNECT, CONNECT_int) message to inform the completion of the transfer (S14), the transition to the conversation (conversation) state (S15).

From then on, the user information cell is transferred between the two subscribers through the established virtual path connection.

The release procedure of the virtual path connection may be performed at the request of the calling or called party.

When the virtual path disconnection procedure is first performed at the request of the originating subscriber, the originating subscriber starts by sending a call / disconnection request (RELEASE_req) message to the UCCF_vporg of the originating exchange system.

Receiving a call / disconnection request (RELEASE_int) message from UCCF_vporg or TCCF_vpict of the local switching system (S16), UCCF_vpdes determines whether a virtual channel connection exists in the virtual path connection (S17) before disconnecting the virtual path connection (S17). If the virtual channel connection does not exist, the virtual channel connection is released first, and then a release procedure of the virtual path connection is started (S18).

The UCCF_vpdes calls the system library of the switch link resource processing block (SLRHF) to release the internal switch path corresponding to the virtual path connection (S19) and requests the deletion of the virtual path identifier (VPI) to the subscriber access module controller (SIMC). (S20).

Then, the call / reconnection request (RELEASE_req) message requesting the release of the virtual path connection is transmitted to the called party (S21), and the state transitions to the call / connection release wait state (Await_RELEASE COMPLETE) (S22).

UCCF_vpdes receiving a call / connection release completion message (RELEASE COMPLETE_req) indicating that the release of the virtual path connection is completed from the called subscriber in the call / connection wait state (Await_Release Complete) (S22) (S23) The user-user exchange virtual path connection established between the called subscriber is released and UCCF_vpedes ends (S24).

In the case of performing the release procedure of the virtual path connection at the request of the called party, the called party starts by transmitting a call / connection release request (RELEASE_req) message to the UCCF_vpdes of the called exchange system.

UCCF_vpdes that has received a call / connection release request (RELEASE_ind) message from the called subscriber (S25) determines whether a virtual channel exists in the virtual path connection before releasing the virtual path connection (S26). The channel connection is released first, and then the release procedure of virtual path association is started (S27).

After the determination, in order to release the virtual path connection, UCCF_vpdes calls the system library of the switch link resource processing block (SLRHF) to release the internal switch path corresponding to the virtual path connection (S28) and virtualizes the subscriber access module controller (SIMC). After requesting to delete the path identifier (S29), the call / connection release request (RELEASE_int) message is transmitted to UCCF_vporg or TCCF_vpict (S30). After transmitting the call / connection disconnection request (RELEASE COMPUTE_req) message to inform the calling subscriber that the release is completed (S31), the user-user switching virtual path in the called user-network connection established between the called exchange system and the called subscriber. The connection is released and UCCF_vpdes ends (S32).

As described above, the method for providing a user-user switched virtual path connection at the called-side user-network connection surface includes a user-user switched virtual path connection between the called subscriber and the destination switching system by the subscriber signaling protocol (DSS2). It is possible to provide a user-user exchanged virtual path connection between the calling party and the called party by performing the procedure of establishing the virtual path connection to the originating subscriber of the home country or another country that requires the service. ISDN) It has the effect of providing the user-user virtual path connection service to the terminating subscriber of its own country for the request of the asynchronous transmission mode (ATM) service of the originating subscriber.

An object of the present invention is a user-user switched virtual path connection between an originating subscriber of a home country or another country switching system between originating subscribers of a home country or another country in a Broadband Integrated Services Digital Network (B-lSDN). Path Connection, UU-SVPC) is requested, and the Digital User Signaling System Number 2 (DSS2), the subscriber signaling protocol, is used at the called user-network interface. It is to provide a user-user exchange virtual path connection between the called party.

Claims (8)

In order to establish a virtual path connection between an originating exchange system and a destination subscriber of a home country that respond to a request for establishing a user-user switched virtual path connection required by an originating subscriber of another country or another station in an asynchronous transmission mode (ATM) switching system. In the method of providing a user-user switched virtual path connection on the called party's user-network interface, an internal call / connection setup request (SETUP_int) message is requested from UCCF_vporg or TCCF_vpict of the local switching system. When received, a first step in which UCCF_naub generates a called subscriber virtual path connection control subprocess (UCCF_vpdes), and a called subscriber virtual path connection control subprocess (UCCF_vpdes) generated from the first step are the main processes of the subscriber connection control block. Call / connection establishment requiring a switched virtual path connection from (UCCF_main) When receiving the old SETHP_mc, the second step of allocating the network resource and the virtual path connection identifier (VPCI) for the requested virtual path connection, and the call / connection setup request (SETUP_mc) message after performing the second step A third step of establishing an internal switch link path using the reserved switch link information included and registering a virtual path identifier (VPI) and a user control parameter (UPC) with a subscriber access module controller (SIMC); After performing, transmit the switch link information response (SwLinkInfoRP) message to notify the calling subscriber or the incoming trunk trunk virtual path connection control subprocess (UCCF_vporg or TCCF_vpict) that the internal switch link path for the transmission of the user information cell is established. A fourth step of delivering a call / connection setup request (SETUP_req) message to the called party and a CONNECT_ind message to the called party; Virtual path connection by sending a call connection complete (CONNECT_int) message to notify the calling subscriber or the incoming relay trunk virtual path connection control subprocess (UCCP_vporg or TCCF_vpict) after completion of the connection, indicating that the establishment of the switched virtual path connection between the calling party and the called party is completed. A fifth step of making the state of the call busy, a sixth step of performing the procedure of releasing the connection of the virtual path in the call according to the request of releasing the virtual path of the calling subscriber after performing the fifth step, and the fifth step A seventh step of performing the procedure of releasing the busy virtual path connection according to a request for releasing the virtual path of the called subscriber after the execution of the call; How to provide. 2. The method of claim 1, wherein the first step is to establish a switched virtual path connection by the main process (UCCF_main) of a subscriber connection control block that receives a call / connection setup request (SETUP_int) message originating from an originating subscriber of the own station or another station. Providing a user-to-user switched virtual path connection in a called user-network connection surface, if required, generating a called subscriber virtual path connection process (UCCF_vpdes). 2. The method of claim 1, wherein the second step includes receiving a call / connection setup request (SETUP_mc) message requesting a virtual path connection from the main process UCCF_vpdes of the subscriber connection control block. And then calling a system library of a user link resource processing block (ULRHF) to allocate a network resource and a virtual path connection identifier (VPCI). 2. The method of claim 1, wherein the third step uses an internal switch link information contained in a call / connection setup request (SETUP_mc) message to establish an internal switch link path for transmission of a user information cell between originating and terminating ALS. Calling system library of switch link resource processing block (SLRHF) for setting up, and receiving virtual path identifier (VPI) and user parameter control (UPC) information to subscriber access module controller. A method of providing a user-to-user switched virtual connection on the connection side. 4. The method of claim 1, wherein the fourth step comprises a switch link information response including internal switch link path information determined for transmission of a user information cell to an originating subscriber or incoming trunk virtual path connection control subprocess (UCCF_vporg or TCCF_vpict). SwLinkInfoRP) message and a call / connection setup request (SETUP_req) message to the called subscriber requesting the establishment of the virtual path connection to the called subscriber. How to Provide. The method as claimed in claim 1, wherein the fifth step is performed between the called exchange system and the called subscriber to the calling subscriber or the incoming relay line virtual path connection control sub-process (UCCF_vporg or TCCF_vpict) after receiving a CONNECT_ind message from the called subscriber. Providing a user-to-user switched virtual path connection on the called party's user-network connection side by sending a connection completion (CONNECT_int) message informing that the request for establishing a user-to-user switched virtual path connection has been completed. Way. The method of claim 1, wherein the sixth step is a procedure for releasing a virtual path connection in a call at the request of an originating subscriber, and the call / connection is released from the originating subscriber or the incoming relay line virtual path connection control subprocess (UCCFP_vporg or TCCF_vpict). After receiving the request (RELEASE_int) message, it performs the deletion of the internal switch link path and the virtual path connection identifier (VPCI) in use, sends a call / disconnection request (RELEASE_req) message to the called party, and waits for call / connection completion. A method for providing a user-to-user switched virtual path connection on a called user-network connection side that receives a call / connection disconnection completion (RELEASE COMPLETE_req) message from a called party in Await-RELEASE Complete. 2. The internal switch link path of claim 1, wherein the seventh step is a procedure of releasing a virtual path connection in a call at the request of a called subscriber, and after receiving a call / disconnection request (RELEASE_ind) message from the called subscriber. Deletes the virtual path connection identification (VPCI) and forwards a call / disconnection request (RELEASE_int) message to the calling subscriber or the incoming relay trunk virtual path connection control subprocess (UCCFP_vporg or TCCF_vpict) and calls / disconnects to the calling subscriber. A method of providing a user-to-user switched virtual path connection in a called user-network connection conveying a completion message.