KR100198445B1 - Provision methods of user-user switched virtual path connection at incoming trunk interference - Google Patents

Abstract

The present invention relates to an asynchronous transfer mode (ATM) switching system, and in the related art, the setting of a virtual path cannot be set only by the shape of a semi-permanent or permanent virtual path connection by a network manager without a signaling procedure. And because a lot of information, time and effort on the network configuration, there was a problem that can not create a new route (route) immediately when the network manager or user needs, the present invention for solving the problem is the broadband comprehensive information of other countries When the calling subscriber of the B-ISDN requests the establishment of the user-user switched virtual path connection to the called subscriber of the local broadband integrated telecommunication network using the trunk line signaling protocol (BISUP), the incoming subscriber at the network-network interface The virtual path connection established by providing a user-user exchange virtual path connection. Through this, it is possible to provide a virtual channel connection service without performing an additional signaling procedure between the calling party and the called party.

Description

Method of Providing User-User Exchange Virtual Path Connection at Incoming Connection

The present invention relates to a method for providing a user-user switched virtual path connection, wherein a transparent connection provided by a conventional ATM layer to an upper layer is called an ATM connection, and the ATM connection is a chain connection of connection elements. Is connected between endpoints.

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

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

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

There may be different virtual channel links in the virtual path connection (VPC), which are distinguished from each other by the virtual path identifier (VCI) assigned to each.

Meanwhile, some virtual channels belonging to different virtual paths may have the same virtual path identifier.

Therefore, one virtual channel can be fully identified only by combining the corresponding virtual path identifier (VPI) and the virtual channel identifier (VCI).

Next, in the definition and setting method of 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 connecting links.

In this case, the virtual channel link refers to a unidirectional virtual connection path for transporting ATM cells between a point where the virtual path identifier (VCI) is allocated and a point where the virtual channel identifier (VCI) 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.

The following four methods are available for establishing or releasing the virtual channel connection (VCC) at a 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 a signaling virtual channel connection (VCC) to establish or release a virtual channel connection (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 a virtual channel connection (VCC) inside a preset virtual path connection (VPC) between two user-network interfaces. .

The virtual path link (VPC) refers to a concatenation of virtual path links so as to connect between a point where the virtual path identifier (VPI) is assigned and a point where the virtual path identifier (VPI) is translated or released.

In this case, the virtual path link means a virtual channel link group between a point where a virtual path identifier (VPI) is allocated and a point where the virtual path identifier (VPI) is translated or released.

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

The following two methods are available for establishing or releasing a virtual path connection (VPC) between the virtual path connection (VPC) endpoints.

First, a connection or disconnection without signaling procedure, in which case the virtual path connection (VPC) is established or released by reservation.

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

In the following application of the virtual path, the virtual path VP is a general term referring to the bundle of the virtual path (VC) links, wherein all the virtual path (VC) links in the bundle have the same end point.

The ATM cell is explicitly assigned a virtual path identifier (VPI) for the virtual path, wherein the virtual path identifier (VPI) identifies a group of virtual channel (VC) links that share the same virtual path connection (VPC). .

Therefore, each virtual path (VP) exchange in the ATM network is assigned a specific virtual path identifier (VPI).

The virtual path (VP) link means a unidirectional ability to transport an ATM cell between two ATM entities for which the virtual path identifier (VPI) value is translated, wherein the virtual path (VP) link is virtual Issued by assigning a path identifier (VPI) value, and terminated by removing the virtual path identifier (VPI).

At the virtual path level, a virtual path connection (VPC) is provided to transfer information between user-user, user-network, and network-network.

When the virtual connection (VC) is exchanged, the virtual path connection (VPC) supporting the input virtual connection (VC) link is terminated first, and a new virtual path connection (VPC) supporting the output virtual connection (VC) link is newly created. do.

The application of the mall virtual path is as follows.

First, a user-user virtual path connection (VPC) is established between TB or SB reference points, providing users with a virtual path connection.

The ATM network elements transport all cells related to the virtual path connection (VPC) through the same route.

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

Secondly, the user-network virtual path connection (VPC) is established between the TB or SB reference point and the network node and is used to collectively connect user devices to network elements.

Third, a network-to-network virtual path connection (VPC) is established between two network nodes, which is applied to network traffic management or routing.

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

The subscriber signaling protocol (DSS2) is also a signaling protocol that originally defined signaling procedures for establishing switched virtual channel connections at the originating and terminating user-network interface (UNI).

In addition, the trunk line signaling protocol (BISUP) defines signaling procedures for establishing switched virtual channel connections at the network-to-network interface (NNI).

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

Therefore, when it is necessary to establish a virtual channel connection for the same calling and called user, there is an overhead of repeating the same operation.

In addition, since the service quality of the required virtual channel connection is different from the service 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 necessary network resources in consideration of all virtual channels, much time and effort are required for network resource allocation.

The above problem can be solved by establishing a virtual path connection.

Since the virtual path connection bundles the virtual channels of the same path and can switch ATM cells only with a virtual path identifier (VPI), connection control for a virtual channel requiring additional connection is not necessary.

In addition, since the network resources required for virtual path connection are reserved, when the virtual channel connection is established through the virtual path connection, the required network resource calculation can be efficiently performed, thereby increasing the efficiency of network resource management.

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. Therefore, much information, time, and effort about the subscriber information and the network shape are required for the virtual path setting.

Therefore, there is a problem that a network administrator or user cannot immediately create a new route when needed.

In order to solve the above problem, a signal capability for establishing a virtual path connection (VPC) has been added to the subscriber signal protocol (DSS2) and the trunk line signal protocol (BISUP), which is an information element of a message (SETUP) requesting the establishment of a virtual connection. Add a Virtual Path (VP) Bearer Class to the Broadband Bearer Capability (BBC) and ignore the Virtual Path Identifier (VCI) in the Connection Identifier information element and ignore the Virtual Path Connection Identifier (VPCI). It only performs connection control on the.

The subscriber signaling protocol (DSS2) performs a procedure for establishing a switched virtual path connection only when the transmission class is a virtual path, and the broadband connection type bearer service (A) whose transmission class is not a virtual path. In the case of the Broadband Connection Oriented Bearer-C (Broadband Connection Oriented Bearer-C) and the Broadband Connection Oriented Bearer-X (BCOB-X), the existing virtual channel connection setup procedure is performed. do.

In order to distinguish the virtual path connection established by the signaling procedure from the virtual path connection established by the network management control or the network manager, it is defined as a switched virtual path connection.

1 is a relationship diagram between an ATM layer and a physical layer according to the present invention.

2 is a relationship diagram between a virtual path and a virtual channel of the present invention.

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

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

5 (a) through 5 (g) are flow charts for setting up incoming user-user switched virtual path connections according to the present invention.

6 is a flow diagram of a trunk line signaling protocol (BISUP) message for establishing incoming user-user switched virtual path connections 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 interface module (SIM) 102: trunk line interface module (TIM)

103: access switch network module (ASNM)

103a: Asynchronous transfer mode switch line block (ASLH)

104: call connection control processor (CCCP) 105: broadband signal access block (BSIF)

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

107: MTP signaling message processing block (SMHF)

108: trunk line connection block (TCIF)

109: trunk line link resource processing block (NLRHF)

110: switch link resource processing block (SLRHF)

111: station number translation block (NTLF) 112: trunk line connection control block (TCCF)

200: ALS / Wideband Telecommunication Network Subscriber (ALS / S)

201: subscriber interface module (SIM) 202: trunk line interface module (TIM)

203: connectionless service module (CLSM)

204: access switch network module (ASNM)

204a: Asynchronous transfer mode switch line block (ASLH)

205: CCCP 206: broadband signal access block (BSIF)

207: SSCF

208: Subscriber Connection Block (UCIF) 209: Subscriber Connection Control Block (UCCF)

210: subscriber link resource processing block (ULRHF)

211: switch link resource processing block (SLRHF)

212: station number translation block (NTLF)

300: Asynchronous Transfer Mode Central Switching Subsystem (ACS)

301: Interconnect Exchange Network Module (ISNM)

301a: Asynchronous transfer mode switch line block (ASLH)

302: operation maintenance processor (OMP) 303: number translation block (NTCF)

304: Path designation control block (RTCF) 305: MA part

306: input / output section 400: intermodule interface (IMI)

The present invention relates to a method for providing an incoming user-user switched virtual path connection, wherein the switched virtual path connection uses a subscriber signaling protocol or a relay line signaling protocol before the subscriber of the broadband integrated network requests the establishment of the virtual channel connection. In this way, the virtual channel connection between the calling subscriber and the called subscriber can be easily set by setting the switched virtual path connection for the subscriber of the broadband integrated communication network in advance.

In addition, the switched virtual path connection may be established between a user-user, a user-network, and a network-network. It is intended to provide a user-user exchange virtual path connection relayed from the NNI to the destination exchange system between the calling party and the called party.

Therefore, when a user-user signaling procedure is used by using a preset virtual path connection between the calling party and the called user, a signaling procedure for establishing a virtual channel connection is unnecessary in a network.

In order to achieve the above object, in the asynchronous transmission mode (ATM) switching system, when a calling party of another station requests the establishment of a user-user switching virtual path connection that is relayed to a called party of its own country, the relay network signaling protocol is used. It provides a user-user exchange virtual path connection relayed from the network interface to the destination switching system between the calling subscriber and the called subscriber.

Therefore, the relay line of the destination switching system that receives an initial address message (IAM) requesting the establishment of the switching virtual path connection from the calling switching system in response to the request for setting up the user-user switching virtual path connection by the calling subscriber of another station. The Trunk Connection Control Function (TCCF) analyzes the initial address message and if the result requires the establishment of a user-user switched virtual path connection, the connection of the virtual path connection required by the network-to-network interface (NNI). Internal Switch Link Path for Bandwidth and Virtual Path Connection Identifier (VPCI) allocation of necessary Band and Virtual Path Connection Identifier (VPCI) Reserve the information.

In addition, an initial address response message (IAA Acknowledge (IAA)) is transmitted to the originating exchange system, and an internal user setup setup message (Internal User SETUP, SETUPu_int) message including switch information is transmitted. UCCF).

In addition, after receiving the switch link information response (SwLinkInfoRP) message including the internal switch link path information determined from the user link control block (UCCF) in response to the internal call / connection setup request (SETUPu_int) message, the relay line connection control block ( TCCF) sets internal routing tag information for delivery of a user cell.

Upon receiving an internal call connection completion (CONNECT_int) message from a user connection control block (UCCF), a response message (ANM) is transmitted to an originating exchange system, wherein a user-user exchange virtualization is performed between the called exchange system and the called subscriber. A path connection is established and the state of the virtual path connection transitions to conversation.

In addition, the trunk line connection control block (TCCF), which is in a busy state due to a call request of a calling party or a called party, performs a procedure of releasing a virtual path connection, and uses an in-band, a virtual path connection identifier (VPCI), and an internal connection. Returns the switch link path and deletes the 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 of the present invention.

In view of the above structure, the asynchronous transfer mode (ATM) switching system is basically an asynchronous transfer mode local switching subsystem (ALS) and an asynchronous transfer mode central switching subsystem (ACS) 300 It consists of two subsystems.

The Asynchronous Transfer Mode Switching Subsystem is hereinafter referred to as ALS and ACS as the Asynchronous Transfer Mode Central Switching Subsystem.

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

The ACS thus acts as a distribution device that performs the interconnection function between the ALSs.

In addition, the ALS is an ALS / BISDN Subscriber (ALS / S) 200 for matching Broadband Telecommunication Network (BISDN) users and an ALS / Broadband Telecommunication Network Repeater (ALS /) for network matching. BISDN Trunk, ALS / T) (100) and ALS / BISDN Subscriber and Trunk (ALS / ST) to accommodate network matching with users.

As the concentrator according to the above, the ALS / S 200 may have a concentrating ratio of n * m in which the number of links on the user side is n (based on 155 Mbps) and the number of links on the switch (ACS) side is m. have.

Therefore, the ACS 300 performs the translation of the called party number in the case of the call / connection control of the own station and the incoming call / connection, and the route control for each relay line in the case of the outgoing call / connection. .

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

4 is a main block diagram for carrying out the establishment of an asynchronous transfer mode (ATM) user-user switched virtual path connection according to the present invention.

The entire user-user switched virtual path connection establishment procedure is described below with reference to FIG.

First, when the calling subscriber's virtual path connection request occurs, the outgoing ALS detects it, performs the virtual path connection service, translates the station number under the control of the outgoing ALS, and then translates or outgoing the number received by the ACS 300. route) Specifies a request.

Upon receipt of the routing request, the ACS 300 designates an incoming ALS.

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

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

At this time, the outgoing ALS counts the user information cell passing through the virtual path in the busy state, and sends the billing data to the ACS 300 along with the service type requested by the user after the call is completed, and the incoming / outgoing ALS is exchanged. Restore the virtual path connection to the maintained state.

2 is a block diagram illustrating a main call / connection processing block for performing the switched virtual path connection control procedure as described above. A description of each block is as follows.

First, a system library block includes a switch link resource handling function (SLRHF) 110, a number translation in ALS function (NTLF) 111, and a subscriber link resource processing. A block (User Link Resource Handling Function, ULRHF) 210, and a trunk line link resource handling function (NLRHF) 109.

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 is a block for performing a destination station number translation, and a subscriber link resource processing block (ULRHF) 210 is a block for performing band allocation and band management of a subscriber link at a user-network interface, and relay line link resource processing. A block (NLRHF) 109 is a block for performing band allocation and band management of a relay line link at a network-node interface (NNI).

In addition, the Broadband Signaling Interface Function (BSIF) 206 is a function of controlling and managing a signaling connection for reliable transmission of B-ISDN call / connection control messages. Do this.

The subscriber service designation coordination processing block (SSCF) 207 is a broadband signal access processing block (BSIF) 206 and a user connection interface function (UCIF) for delivering a subscriber signal message. Performs an adjustment function between 208).

The subscriber connection access processing block (UCIF) 208 performs a low speed function of a subscriber signaling message.

In addition, a subscriber connection control block (UCCF) 209 performs subscriber call / connection control.

The trunk service specific coordination function (106) is a broadband signal access processing block (BSIF) 105 and an MTP-3 signaling message handling function (MTP-3 signaling message handling function) to transmit the trunk line signaling message. , SMHF) performs an adjustment function between the 107.

In addition, it performs the MTP-3 function in the MTP signal message processing block (SMHF) No.7 signaling.

The trunk connection interface block (TCIF) performs an MTP signal message transfer function between the MPT signal message processing block (SMHF) and the trunk connection control block (Trunk Connection Control Function).

The trunk line connection control block (TCCF) 303 block performs a B / ISDN user part (BISUP) call / connection control.

There is also a Number Translation in ACS (NTCF) and a Routing Control Function (RTCF) 304 for performing routing designation.

FIG. 5 (a) to FIG. 5 (g) are flow charts for setting up incoming user-user switched virtual path connections according to the present invention.

And FIG. 6 is a flow chart of a relay line signaling protocol (BISUP) message for establishing incoming user-user switched virtual path connection according to the present invention.

Referring to the drawings, a procedure of providing a user-user exchanged virtual path connection that is specifically relayed will be described.

When the main process TCCF_main of the trunk line connection control block receives the incoming trunk line connection establishment request (IAM_ind) (S2) message from the originating exchange system by the originating user request in idle state (S1), the result is In case of this virtual path, an incoming trunk trunk virtual path connection control child process (TCCF_vpict) is created (S4). In the case of a virtual channel, an incoming relay trunk virtual channel connection control child process (VCCF_vcict) is created (S5) and is idle again. (S6).

5 (a) to 5 (g) illustrate a procedure of providing a user-user switched virtual path connection that is entered at a network-network interface.

When the incoming trunk trunk virtual path connection control child process (TCCF_vpict) is idle (S7), the main process (TCCF_main) of the trunk connection chain control block is the incoming subscriber's user-user exchange to the incoming trunk trunk virtual path connection control child process (TCCF_vpict). When forwarding the setup request for virtual path connection (IAM_mc) (S8), the relay link resource processing block (NLRHF) allocates a band and virtual path connection identifier (VPCI) required for the virtual path connection (S9) and then sends the IAM to the originating exchange system. Response to message (IAM_req) (S10) Deliver message IAA, translate station number (S11) from station number translation block (NTLF), and caller number translation (S12) from number translation block (NTCF), then switch link resource processing block Internal switch path reservation is made at SLRHF (S13), and a SETUPu_int (S14) message is delivered to the called party main process of the subscriber connection control block (UCCF) and the initial address message response waits. It is in state (Await_IAA) (S15).

When receiving the switch link information response message (SwLinkInfoRP) S16 from the called subscriber virtual path connection control child process (UCCF_vpdes) in the standby state (S15), the system library of the switch link resource processing block (SLRHF) is called to switch the internal switch link. After setting the path (S17) and registering the virtual path identifier (VPI) with the trunk line connection module controller (TIMC) (S18), a message including information for network parameter control (NPC) is displayed. Interface Module Controller (TIMC) to set the internal path designation tag (S19).

In operation S20, the processor enters the response wait state AwaitM_ANM.

When the TCCF_vpict receives the Connect_int (S21) message from UCCF_vpdes in the response wait state (Await_ANM) 20, the TCCF_vpict notifies that the setting of the user-user switched virtual path connection requested by the originating exchange system is completed at the incoming relay line. After the response message (ANM) S22 is transmitted, the process transitions to the conversation state S23.

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

The release of the virtual path connection in the busy state (S23) may be performed at the request of the calling or called party.

In the case where the virtual path connection release procedure is performed at the request of the originating subscriber, the originating exchange system starts by transmitting a call / connection release request (REL) (S24) message to the TCCF_vpict of the terminating exchange system.

TCCF_vpict receiving a call / connection request (REL) message from the originating exchange system determines whether a virtual channel exists in the virtual path connection before releasing the virtual path connection (S25). Release the channel connection first, and then start the virtual path connection release procedure.

The TCCF_vpict calls the system library of the switch link resource processing block (SLRHF) to release the internal switch path corresponding to the virtual path connection (S26) and designates the virtual path identifier (VPI) and the internal path to the trunk line connection module controller (TIMC). The deletion of the internal route tag is requested (S27).

In addition, the system library of the relay line resource processing block NLRHF is called and returned as a band allocated to the virtual path connection and the virtual path connection identifier (S29).

In order to request the release of the virtual path connection to UCCF_vpdes, a call / connection release request (RELEASE_int) message is transmitted (S30), and the call / connection release completion (Release Complete) notifying the originating exchange system that the release of the virtual path connection is completed. After passing the message, RCL) (S31), the user-user exchanged virtual path connection established in the incoming relay line is released and TCCF_vpict ends (S32).

On the other hand, when performing the release of the virtual path connection at the request of the called party, TCCF_vpict receiving the call / connection release request (RELEASE_int) (S33) message from the UCCF_vpdes in the busy state (S32) is connected to the virtual path. It is determined whether a virtual channel exists in the virtual path connection before releasing (S34). If there is a virtual channel connection, the virtual channel connection is released first, and then a release procedure of the virtual path connection is started (S37).

The TCCF_vpict calls the system library of the switch link resource processing block (SLRHF) to release the internal switch path corresponding to the virtual path connection (S35) and designates the virtual path identifier (VPI) and the internal path to the trunk line connection module controller (TIMC). The deletion of tag information is requested (S36).

In addition, the system library of the trunk line link resource processing block (NLRHF) is called to return the band allocated to the virtual path connection and the virtual path connection identifier (S38).

Then, the call / connection release request (REL) message is transmitted to the originating exchange system (S39), and the state transitions to the call / connection release completion wait state (Await_RCL) (S40).

Receiving a call / disconnection complete (RCL) message indicating that the virtual path connection is complete from the originating exchange system (S41), TCCF_vpict releases the user-user switched virtual path connection established on the incoming trunk and terminates TCCF_vpict. (S42).

A method for providing a user-user switched virtual path connection which is relayed to a destination switching system on a network-network connection surface as described above is provided between a user between an originating switching system and a destination switching system by a relay line signaling protocol (BISUP). -By performing the virtual path setup procedure for the originating subscriber of the home country or another station that requires the user switched virtual path connection, it is possible to provide the user-user exchanged virtual path connection between the calling party and the called party. (B-ISDN) It has the effect of providing the service to the called subscriber in its own country in response to the Asynchronous Transfer Mode (ATM) service request of the calling subscriber.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asynchronous transfer mode (ATM). In particular, an outgoing subscriber of a foreign switching system in a broadband integrated services digital network (B-ISDN) is a user-user B-ISDN User Part, which is a trunk line signaling protocol at the Network-Network Interface (NNI), for the case of setting up a User-User Switched Virtual Path Connection. It aims to provide a user-user exchange virtual path connection that is relayed between an originating and incoming exchange system using BISUP.

Claims (7)

In order to set up the incoming subscriber's virtual connection of the receiving party, the request of the user-user switching virtual path connection relayed to the destination switching system by the request of the originating subscriber of the other station in the asynchronous transmission mode (ATM) switching system is established. In the method of providing a user-to-user switched virtual path connection which is relayed on a network connection surface, when an initial address message (IAM) requesting a switched virtual path connection is received from an originating switching system of another station, TCCF_main is an incoming relay line. A first step of generating a virtual path connection control child processor (TCCF_vpict) and an incoming trunk trunk line connection control child process (TCCF_vpict) generated from the first step is exchanged from the main process (TCCF_main) of the relay line connection control block; Received an initial address message (IAM_mc) requesting a virtual path connection. In this case, the system library of the trunk line link resource processing block (NLRHF) is called to allocate the network resource and the virtual path connection identifier (VPCI) for the requested virtual path connection. Reserves switch link information to set the link path, calls the station translation block (NTLF) to translate the station number of the called party number, requests translation of the called party number to the number translation block (NTCF), and internal calls / connections to UCCF_vpdes. A relay line connection module after receiving a switch link information response message (SwLinkInfoRP) from UCCF_vpdes after performing the second step of transferring the setup request message (SETUPu_int) and transitioning to an initial address response wait state (Await_IAA), and performing the second step. Point-to-point connection establishment request message (PtP_ConnEstabRQ) and point-to-point network control parameter information message (PtP_NPCIn) to the controller (TIMC). the third step of registering the virtual path identifier (VPI), the network control parameter (NPC) information and the internal routing tag information using the formation and transitioning to the response waiting state (Await_ANM), and connecting from UCCF_vpdes. Number of Received (CONNECT_int) Messages to the outgoing relay system to the incoming relay system indicating that the establishment of the user-user exchanged virtual path connection is complete. A fourth step of bringing a state into a conversation; a fifth step of performing a procedure of releasing the busy virtual path connection according to a request for releasing the virtual path of the calling subscriber after performing the fourth step; A sixth step of performing a procedure of releasing the virtual path connection in a call according to the request of releasing the virtual path of the called subscriber after performing the fourth step; And providing a user-to-user switched virtual path connection at the incoming connection surface. The main process (TCCF_main) of the relay line connection control block according to claim 1, wherein the first step comprises receiving an initial address message (IAM) from an originating exchange system for a virtual path connection initiated by a request of an originating subscriber of another station. A method for providing a user-to-user switched virtual path connection at an incoming connection surface, characterized by generating an incoming relay line virtual path connection child process (TCCF_vpict) to establish an incoming switched virtual path connection. 2. The method of claim 1, wherein the second step receives an initial address message IAM_mc requesting a switched virtual path connection from the main process TCCF_main of the incoming trunk trunk virtual path connection control child process TCCF_vpict. Then, the system library of the trunk line link resource processing block (NLRHF) is called to allocate band and virtual path link identifiers (VPCIs), forward initial address response messages (IAAs) to the originating exchange system, and switch link resource processing blocks. Reserve the switch link information to call the system library of (SLRHF) to set the internal switch link path for the transmission of the user information cell, and call the station number translation block (NTLF) to translate the station number of the called party number and the number translation block. Requesting party number translation to (NTCF) to find incoming subscriber and requesting internal call / connection setup method to UCCF_vpdes Not pass (SETUPu_int), and the user in the incoming connection surface characterized in that the transition to the initial address response waiting state (Await_IAA) - method of providing a user switched virtual path connections. The internal switch link path of claim 1, wherein the third step calls the system library of the switch link resource processing block SLRHF after receiving the switch link information response message SwLinkInfoRP from UCCF_vpdes. And PtP_ConnEstabRQ and PtP_NPCInformation messages to register the virtual path identifier (VPI), network parameter control (UPC) information and internal routing selection information to the trunk line connection module controller (TIMC), and wait for a response (Await_ANM). A method for providing a user-to-user switched virtual path connection in an incoming connection surface, characterized in that transitioning to a network. The method of claim 1, wherein the fourth step comprises: a response message (ANM) notifying the incoming relay system that the incoming relay system completes a request for establishing a user-user switched virtual path connection after receiving a CONNECT_int message from UCCF_vpdes. (B) transmitting a state of the virtual path connection to a conversation by transmitting a). 5. The internal switch link path as set forth in claim 1, wherein the fifth step further comprises: after receiving a call / connection release request (REL) message from an originating exchange system, TCCF_vpict calls a system library of a switch link resource processing block (SLRHF). Deactivate the VTP and Internal Routing Tag information by passing the point-to-point disconnect request message (PtP_ConnEstabRQ) to the trunk line connection module controller (TIMC), and the relay link resource control block. Calls (NLRHF) system library to delete the active band and virtual path connection identifier (VPCI), forwards the internal call / disconnection request (RELEASE_int) message to UCCF_vpdes, and completes the call / disconnection to the originating exchange system. After delivering a (RLC) message, TCCF_vpict terminates providing a user-user switched virtual path connection at the incoming connection side. Law. The method of claim 1, wherein the seventh step, after receiving an internal call / release request (RELEASE_int) message from UCCF_vpdes, TCCF_vpict calls the system library of the switch link resource processing block (SLRHF) to release the set internal switch link path. In addition, the point-to-point disconnect request message (PtP_ConnEstabRQ) is transmitted to the trunk line connection module controller (TIMC) to delete the virtual path identifier (VPI) and internal routing tag information, and the relay link resource control block (NLRHF). Call the system library to delete the active band and virtual path connection identifier (VPCI), send a call / disconnection request message (REL) to the originating exchange system, and then wait for a call / connection disconnection (Await_RLC). TCCF_vpict terminates when a call / connection completion (RLC) message is received from the originating exchange system in the Await_RLC state. If an incoming connection from the user to - how to provide a user switched virtual path connections.