KR100262944B1 - Method of providing virtual tunnel using incoming trunk call control procedures at NNI - Google Patents

Abstract

PURPOSE: A method for supplying a virtual tunnel using an incoming call control process in an NNI(Network-Node Interface) is provided to supply a virtual tunnel(i.e. network-network virtual path) between two exchanges using an incoming call control process of a BISUP(B-ISDN(Broadband-Integrated Services Digital Network) User Part) in an NNI, so as to improve the efficiency of network resources). CONSTITUTION: An IAM(Initial Address Message) requesting the establishment of a virtual tunnel is received to a main processor of a TCCF(Trunk Connection Control Function) from an originating exchange or a relaying exchange. The main processor of TCCF generates an Incoming Trunk Virtual Path Connection Control Process(TCCF-vpict), and delivers a message(IAM-mc) for setting up a virtual tunnel to the TCCF-vpict. The TCCF-vpict pages a system library of an NLRHF(Network Link Resource Handling Function) and requests the allocation of an incoming band and an ID number of a virtual channel, to transmit an IAA(IAM Acknowledge) message indicating the effectiveness of a network resource to the relaying exchange or the originating exchange of a remote station and translate a dialing code of an incoming exchange number. The TCCF-vpict delivers a message(VP-EstabSig) informing the establishment request of a VP(Virtual Path) to a manager of the incoming exchange, and an initial address response message awaiting state(Await-IAA) is returned. If a message(VP-EstabACK) indicating the establishment acknowledgement of a VP is received from the manager of the incoming exchange, the TCCF-vpict extracts internal switch link path information from an SLRHF(Switch Link Resource Handling Function), and delivers a point-to-point connection establishment request message(PtP-ConnEstabRQ) to a TIMC(Trunk Interface Module Controller), to register VPI(Virtual Path Identifier), VCI(Virtual Channel Identifier), network control parameter information and an internal switch link path information. The TCCF-vpict transmits an ANM(Answer Message) to the remote station, and a busy state is returned. According to a request to release the virtual channel of the manager of the originating/incoming exchange, the connection of the virtual tunnel is released.

Description

Method of providing virtual tunnel using incoming trunk call control procedures at NNI}

The present invention relates to a method for providing a virtual path using an incoming call control procedure at a network-network interface of an Asynchronous Transfer Mode (ATM) switching system. Particularly, the present invention relates to a broadband integrated services network (B-ISDN). In the case of a digital exchange, the originating exchange manager of another station requests the establishment of a virtual tunnel (ie, a network-network virtual path) between the originating exchange and the destination exchange. Virtual channel (network-network virtual) using incoming call control procedure between originating and terminating exchange using BISIS User Part (BISUP), which is the trunk line signaling protocol in NNI: Network-Node Interface Route).

The transparency connection that the ATM layer provides to the upper layer is called an asynchronous transfer mode connection, which is connected between endpoints by a chain of connection elements.

There are two types of ATM connections: Virtual Channel (VC) and Virtual Path (VP).

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

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

Within the virtual path VP there may be different virtual channel (VC) links, which are distinguished from each other by the virtual channel identification number (VCI) assigned to each of them.

Meanwhile, among the virtual channels VC belonging to different virtual paths VP, virtual channel identification numbers VCI may be the same. Therefore, one virtual channel VC can be fully identified only by combining the corresponding virtual path identification number VPI and the virtual channel identification number VCI.

Virtual path (VP) is a general term for a bundle of virtual channel links (VCLs), where all virtual channel links (VCLs) in the bundle have the same endpoint.

An ATM cell is explicitly assigned a virtual path identification number (VPI) for a virtual path (VP), which identifies a group of virtual channel (VC) links that share the same virtual path (VP).

Each time a virtual path (VP) is exchanged in an ATM network, a specific virtual path identification number (VPI) is assigned. Virtual Path Link (VPL) refers to the unidirectional ability to transport an ATM cell between two ATM entities whose value is translated into a Virtual Path Identification Number (VPI). Is generated by assigning a virtual path identification number (VPI) value and terminates when the virtual path identification number (VPI) is removed.

In the virtual path (VP) level, a virtual path (VP) is provided to transfer information between user-user, user-network, and network-network.

When the virtual channel VC is exchanged, the virtual path VP supporting the input virtual channel link is terminated first, and a virtual path VP supporting the output virtual channel link is newly created. The application of the virtual path (VP) is as follows.

First, the user-to-user virtual path (VP) is set between the T _B or S _B reference points and provides the user with the virtual path (VP). ATM network elements transport all cells related to this virtual path (VP) through the same route. Corresponding virtual path identification numbers (VPIs) are translated in ATM network elements that provide cross linking or switching functions.

Second, the user-network virtual path (VP) is established between the T _B or S _B reference point and the network node, and is used to collectively connect user devices to the network element.

Third, a network-to-network virtual path (VP) is established between two network nodes, which is applied to network traffic management or route assignment. In the network node where the virtual path VP is terminated, the virtual channels VC in the virtual path VP are exchanged or cross-connected with the virtual channels VC in the other virtual path VP.

The trunk line signaling protocol (BISUP) originally defined a call control procedure for establishing a virtual channel at the network-to-network interface (NNI). Since the virtual channel (VC) needs to establish a connection whenever the calling user requests, it must repeatedly perform connection control such as network resource allocation and internal switch path.

Therefore, there is an overhead of repeating the same operation when it is necessary to set up a virtual channel (VC) using the same path. In addition, since the quality of service (QoS) of the required virtual channel (VC) is different from the QoS of the virtual channel (VC) already set in the transmission link, the quality of service of the existing virtual channel connection is reduced. In order to satisfy the QoS of the new virtual channel (VC) while maintaining it, it is necessary to calculate network resources that can be allocated in consideration of all virtual channels (VC) in the transport link, which requires a lot of time and effort required for network resource allocation.

In order to solve this problem, in case of using the virtual path, the virtual path (VP) bundles the virtual channels of the same route into a bundle so that only ATM cell switching can be performed with the virtual path identification number (VPI). No connection control is required for the virtual channel (VC) that requires.

In addition, since a network resource necessary for the virtual path VP is reserved in advance, when the virtual channel VC is set through the virtual path VP, network resource allocation required for setting the virtual channel VC is performed within a short time. can do.

Currently, the application of the virtual path (VP) that can be set using the signaling protocol is limited to the user-user virtual path, and the user-network and network-network virtual paths can be set only by the exchange administrator.

Conventionally, since the setting of the virtual path (VP) can be set only in the form of a semi-permanent or permanent virtual path (PVP) by the exchange manager without a signaling procedure, a subscriber for the virtual path (VP) setting is required. Much information, time, and effort were required on information, topology and configuration.

Therefore, there was a problem that a new virtual path (VP) could not be created immediately when the exchange manager or user wanted.

To address this, the International Organization for Standardization added signaling capabilities for establishing virtual paths (VPs) in subscriber signaling protocols (DSS2) and trunk line signaling protocols (BISUP). Add Virtual Path (VP) bearer class (BC) to Broadband Bearer Capability (BBC) which is an information element, and ignore virtual channel identification number (VCI) in connection identification number information element and virtual path identification number (VPI) only performs connection control.

This signaling protocol performs the virtual path setup procedure only if the transmission class is virtual path (VP), and the transmission class is not the virtual path, and is connected with BCOB-ABroadband Connection Oriented Bearer-A and broadband. In case of the connection type forwarding service type-C (BCOB-C) and the connection type forwarding service type-X (BCOB-X: Broadband Connection Oriented Bearer-X), the existing virtual channel setup procedure is performed. do.

However, the application of virtual paths (VPs) that can be established using this signaling protocol is limited to user-user virtual paths. To extend the user-user virtual path setting function, the virtual path forwarding class is expanded into three types: user-user virtual path (same as the existing virtual path forwarding class), user-network virtual path, and network-network virtual path. It was.

The biggest difference between the user-user virtual path and the network-network virtual path is shown in Table 1 below.

By the way, a semi-permanent or permanent virtual path (PVC) that is set up between two exchanges (incoming and outgoing exchanges) or between two exchanges via one or more relay exchanges is specifically called a virtual tunnel. As described above, a lot of information is required for setting, and the allocated network resources (bands) are fixed, so when a band is to be changed, the virtual path must be released and then reset.

Therefore, by establishing a network-network virtual path (VP), which is a virtual path between two exchanges, using a relay line signaling protocol (BISUP), a method for providing a virtual path (network-network virtual path) between two switching periods is provided. It is required.

Accordingly, the present invention has been made to solve the problems described above, the virtual path (network-network virtual) of the two exchange periods using the incoming call control procedure of the relay line signaling protocol (BISUP) in the network-network connection surface It is an object of the present invention to provide a method for providing a virtual path for improving the efficiency of network resources.

1 is an explanatory diagram comparing the concept of a network-network virtual path and a user-user virtual path to which the present invention is applied.

Figure 2 is a block diagram schematically showing the configuration of an asynchronous transfer mode (ATM) switching system to which the present invention is applied.

3 is a processing block diagram for providing a virtual passage using an incoming call control procedure of an asynchronous transfer mode (ATM) switching system according to an embodiment of the present invention.

4 is an explanatory diagram illustrating a relay line signal protocol message processing procedure for setting up a virtual path using an incoming call control procedure according to an embodiment of the present invention;

5A to 5F are flowcharts illustrating a method for providing a virtual passage using an incoming call control procedure according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

300 to 302: switch link resource management processing block

310 to 312: station number translation block

320 to 322: network link resource management processing block

330 to 332: broadband signal connection processing block

340, 341: subscriber service designated coordination processing block

350, 351: subscriber connection block

360, 361: subscriber connection control block

370: trunk line service specified adjustment processing block

380: MTP signaling message processing block

381 relay connection connection block 382 relay connection control block

390: number translation block 391: routing control block

In order to achieve the above object, the present invention provides a method for providing a virtual path (network-network virtual path) using an incoming call control procedure between an originating and receiving exchange in an asynchronous delivery mode (ATM) switching system. The main processor TCCF_main of the trunk line control block that receives the initial address message IAM requesting the establishment of the virtual path from the relay exchange creates the incoming trunk line virtual path connection control child processor TCCF_vpict and sets the virtual path. Transmitting a message IAM_mc to the incoming trunk trunk virtual path connection control child processor TCCF_vpict; The incoming relay trunk virtual path connection control child processor TCCF_vpict receiving the message IAM_mc calls the system library of the network link resource management processing block NLRHF to request the allocation of the incoming band and the virtual channel identification number. In response to the request result, a message (IAA) indicating that the incoming network resource is valid is transmitted to the relay or originating exchange of a large country, and then the station number of the destination exchange number is translated, and the translation result of the destination exchange number is notified. And a second step of transitioning to an initial address response message waiting state (Await_IAA) after delivering a message (VP_EstabSig) for notifying a request for setting a virtual path to an administrator of the destination exchange; When a message VP_EstabACK is received from the administrator of the destination exchange to inform the establishment of the virtual path, the incoming trunk virtual path connection control child processor TCCF_vpict receives an internal switch link from the switch link resource management processing block SLRHF. It extracts the route information and transmits the point-to-point connection establishment request message (PtP_ConnEstabRQ) to the trunk line connection module controller (TIMC) to send the virtual path identification number (VPI), virtual channel identification number (VCI), network control parameter information, and internal switch. Registering link path information, transmitting a virtual path establishment complete response message (ANM) to a power station, and then transitioning to a busy state; And a fourth step of releasing the virtual passage connection in the busy state according to the call release request of the originating exchange exchange manager.

According to the present invention, when the B-ISDN originating exchange manager of another station in the ATM switching system requires the establishment of the virtual path at the network-network interface (NNI), the user-user virtual path setting function of BISUP is extended to the network-network interface. By providing the network-network virtual path (virtual path) using the incoming call control procedure, the ATM virtual channel connection service can be provided without performing additional connection control procedure between the originating and destination exchange through the established virtual path. It is possible to reduce the call setup processing time, to facilitate the setup and release of this virtual path using the relay line signal protocol, and to change and delete the band according to the bandwidth utilization of the virtual path, thus the efficiency of network resources. Can increase.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an explanatory diagram comparing the concept of a network-network virtual path and a user-user virtual path to which the present invention is applied.

As shown in FIG. 1, the user-user virtual path refers to a virtual path (VP) between the broadband general information network terminal and the broadband comprehensive information network terminal, and the network-network virtual path is a relay exchange period or relay period. Period of exchange and incoming exchange, or outgoing exchange and incoming exchange.

A virtual path (VP) is a network manager that establishes a virtual path (network-network virtual path) for a subscriber of a broadband integrated telecommunication network using a relay line signaling protocol when a subscriber of the broadband integrated telecommunication network requests setting up a virtual channel (VC). It is an object of the present invention to easily set a virtual channel (VP) setting between the calling subscriber and the called subscriber by setting in advance.

The virtual path (VP) can be set up between user-user, user-network, and network-network. The present invention provides network-network virtual paths which are relayed using relay line signaling protocol, especially at network-network interface (NNI). By providing a between the originating exchange and the destination exchange, it is intended to replace a permanent virtual path that is purely set up by the exchange manager without using signaling protocols.

The use of a preset virtual path (network-network virtual path) between the originating and destination exchanges eliminates the need for additional connection control for the virtual channels using this virtual path.

Figure 2 is a block diagram schematically showing the configuration of an asynchronous transfer mode (ATM) switching system to which the present invention is applied.

As shown in FIG. 2, an ATM switching system basically includes an ATM Local Switching Subsystem (ALS) 210, 220, and 230 and an ATM Central Switching Subsystem (ACS) 200. .

The ATM local switching sub-systems 210, 220, and 230 operate together with the ATM central switching sub-system 200 as a concentrating device having a constant collecting ratio. Accordingly, the ATM central switching subsystem system 200 acts as a distribution device that performs the interconnection function between the ATM local switching subsystem systems 210, 220, and 230. In addition, the ATM local switching sub-system (210, 220, 230) is the ATM local switching sub-system / broadband integrated information network subscriber (ALS / S: ALS / BISDN Subscriber) 220 for user registration of the broadband integrated telecommunication network users, for network matching ATM Local Switching System / Wideband Telecommunications Network Trunk Line (ALS / T: ALS / BISDN Trunk) 210, and ATM Local Switching System / Wideband Integrated Telecommunication Network Subscriber and Relay Line (ALS / T) ST: ALS / BISDN Subscriber and Trunk) 230.

As a concentrator, the ATM local switching sub-system / broadband integrated information network subscriber (ALS / S) 220 sets the number of user-side links to n (155 Mbps), and switches (side the ATM central switching sub-system 200) side links. It can have a collection ratio of n * m in which the number m.

Accordingly, the ATM central switching unit system 200 translates the called number in case of own station and incoming call / connection in call / connection control, and routes for each relay line in case of outgoing call / connection. Perform control.

In addition, the ATM central exchange system 200 has an operation and maintenance processor (OMP) 201 for operation and maintenance of the entire system, as well as system-wide maintenance, testing, measurement and statistical functions. Perform various input / output control functions with the operator.

3 is a processing block diagram for providing a virtual path using an incoming call control procedure of an asynchronous transfer mode (ATM) switching system according to an embodiment of the present invention.

As shown in FIG. 3, a system library block includes a switch link resource handling function (SLRHF) 300, 301, 302 and a number translation in ALS function (NTLF). 310, 311, 312, and a Network Link Resource Handling Function (NLRHF) (320, 321, 322).

The switch link resource management processing block (300,301,302) is a block for generating internal switch link path setting and route information of ATM cell header (VPI, VCI), and the station number translation block (310,311,312) is called A block for performing a station number translation of a number, and the network link resource management processing blocks 320, 321, and 322 are blocks for processing VPI, VCI, band allocation, and band management of a relay line link at a network-network interface.

In addition, the Broadband Signaling Interface Function (BSIF) 330, 331 and 332 functions to control and manage a signaling connection for reliable transmission of ATM call / connection control messages.

A subscriber service specific coordination function (SSCF) 340, 341 may be configured to transmit a subscriber signal message with a BSIF (330, 331, 332) and a user connection access block (UCIF: User Connection). Interface Function (350, 351) performs an adjustment function.

In addition, the subscriber connection access blocks (UCIFs) 350 and 351 perform access functions of subscriber signal messages.

In addition, a user connection control function (UCCF) 360,361 performs subscriber call / connection control.

Also, trunk service specific coordination function (TSCF) 370 is used to transmit the trunk line signal message to BSBS 330, 331, 332 and MTP signal message processing block (SMHF: MTP). -3 performs an adjustment function between signaling message handling functions (380).

In addition, the MTP signal message processing block (SMHF) 380 performs an MTP-3 function among No. 7 signaling methods.

In addition, a trunk line connection connection block (TCIF) 381 is an MTP signal between the MTP signal message processing block (SMHF) 380 and a trunk line connection control block (TCCF) 382. Perform message passing.

In addition, the trunk line connection control block (TCCF) 382 performs the BISUP call / connection control.

There are a number translation block (NTCF) for receiving called number translation (NTCF) 390 and a routing control block (RTCF) 391 that performs routing control.

4 is an explanatory diagram showing a relay line signal protocol message processing procedure for setting a virtual path using an incoming call control procedure according to an embodiment of the present invention.

As shown in Fig. 4, the establishment of the virtual passage begins by the originating exchange manager sending a VP_EstabRQ message requesting the establishment of the virtual passage. The trunk line connection control block (TCCF) that receives the VP_EstabRQ message creates an outgoing trunk virtual path connection control process (TCCF_vpogt) that performs network-network virtual path establishment, and creates a network-network virtual path. Information necessary for setting is transferred to an initial address message (IAM) and transferred to TCCF_vpogt.

TCCF_vpogt analyzes the destination number information of the IAM_mc message and transmits an initial address message requesting the establishment of the network-network virtual path to the relay or destination exchange.

The TCCF in the terminating exchange of the own country that receives the IAM message from the TCCF_vpogt generates the TCCF_vpict and forwards the IAM_mc message to the TCCF_vpict.

Incoming Trunk Virtual Path Connection Control Process (TCCF_vpict) that receives IAM_mc message is assigned a network resource and virtual path number for incoming link, and if the result is valid, it receives from the relay or destination exchange. An initial address response message (IAA: IAM Acknowledge) indicating that the incoming network resource is valid is transmitted to the request for setting up the virtual path. The manager of the destination exchange is notified of the setting of the virtual passage.

Receiving a response to the request for establishing the virtual path from the manager of the relay exchange, the TCCF_vpict analyzes the called number information, translates the station number and the number of the called exchange number, and is assigned internal switch link path information.

Upon successful completion of the above procedure, TCCF_vpict transfers cell header information for transmission of the user cell to the trunk interface module controller (TIMC) and assigns it to the cell header translation table and sends a response message to the counter exchange. When (Answer Message, ANM) is sent, the establishment of the virtual path (network-network virtual path) between the originating and destination exchange is completed, and the state of the virtual path transitions to conversation.

The release of the virtual path is initiated by delivering a VP_RelRQ message to TCCF_vpogt or TCCF_vpict at the request of the originating or terminating exchange manager. The release of the virtual path is terminated by performing the return of the band, VPCI and internal switch link path information of the virtual path in which TCCF_vpogt or TCCF_vpict is in a call, and deletion of the cell header translation table.

5A to 5F are flowcharts illustrating a method for providing a virtual path using an incoming call control procedure according to an embodiment of the present invention.

As shown in Fig. 5A, TCCF_main, which is the main process of the trunk line control block located in the incoming asynchronous transfer mode local switching system at the network-network interface (NNI), is the originating or outgoing TCCF_vpogt of the relay exchange. The procedure of generating a TCCF_vpict for the initial address message delivered to request the establishment of the virtual path and delivering the IAM_mc message may be performed by relaying or requesting the virtual path establishment request from the originating exchange manager when the TCCF_main state is idle (500). If an initial address message requesting the establishment of an incoming virtual path forwarded by TCCF_vpogt of the originating exchange is received (501), it is determined whether the forwarding class is a virtual level (502), and the incoming virtual path control if the forwarding level is a virtual level. Create a child process TCCF_vpict (503), and if the delivery class is not virtual, connect the incoming virtual channel. A TCCF_vpict, which is a control child process, is created (506).

After generating the TCCF_vpict, the IAM_mc message is transferred to the TCCF_vpict (504).

The idle state is maintained (505).

As shown in FIGS. 5B-5F, the procedure for establishing and releasing the virtual passage using the incoming call control procedure at the network-network interface, TCCF_vpict requires setting up the virtual passage from TCCF_main in idle state (510). When receiving an initial address message (Main-to-Child IAM, IAM_mc) message (511), a band and a virtual path number required for the establishment of the virtual path from the relay line resource processing block is allocated (512), the relay or destination exchange After notifying an initial message response message indicating that the network resource of the incoming virtual path is valid for the requested virtual path setting request (513), the station number translation block is called to translate the station number (514), and the number translation block is called. Translates the number (516), sends a message VP_Estabrq requesting the establishment of the virtual path to the manager of the destination exchange (516), and the initial message response message waiting state (Await_). IAA) (517).

When TCCF_vpict receives a VP_EstabRP message in response to a request for setting up a virtual path from the destination exchange manager in the Await_IAA state (520) (521), it calls the switch link resource management processing block to set the internal switch link path (522), After transmitting the connection identifier and the information message for network parameter control to the relay line connection module controller (523), and after transmitting a response message (Answer, ANM) indicating that the setting of the requested virtual path is completed (524), the call Transition to conversation (525).

At this point, a call control procedure may be performed for a request for setting a virtual channel passing through the set virtual passage.

The procedure for releasing the virtual passage may be performed by an administrator request of the originating or terminating exchange. If TCCF_vpogt receives a VP_RelRQ message in a busy state 530 (531), TCCF_vpogt may be in the virtual passage before releasing the virtual passage. In operation 532, the virtual channel is first released, and then the virtual channel is released.

TCCF_vpict calls the system library of the switch link resource management processing block to release the internal switch path corresponding to the virtual path (533), and requests the connection identifier release to the trunk line connection module controller (534).

The relay line link resource management processing block is called to release the band and virtual path number allocated to the incoming link (535). In order to request the release of the virtual path to the relay or originating exchange, the virtual path release request message REL is transmitted (536), and the virtual path release complete (Release Complete, RLC) transitions to the wait state (Await_RLC) (537).

When TCCF_vpict receives a virtual path release completion message from the relay or originating exchange notifying that the release of the virtual path is completed (538), the TCCF_vpict sends a VP_RelRP to the destination exchange manager (539) and terminates.

When the virtual channel release procedure is performed at the request of the originating exchange manager, when TCCF_vpict receives the virtual path release completion message from the relay or originating exchange (540), the virtual channel exists in the virtual passage before releasing the virtual passage. If the virtual channel exists as a result (541), the virtual channel is released first, and then a release procedure of the virtual channel is started (542).

TCCF_vpict calls the system library of the switch link resource management processing block to release the internal switch link path corresponding to the virtual path (543), requests the relay line connection module controller to delete the connection identifier (544), and the routing control block. The message is forwarded to release the path and band to the destination exchange (545).

Then, the relay line resource management processing block is called to release the band and virtual path number assigned to the incoming link (546), and then the VP_Relrp is transmitted to the destination exchange manager (547), and the virtual path is forwarded to the relay or originating exchange. After passing the virtual path release completion message 548 informing that the release is complete, TCCF_vpict ends.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

The present invention as described above, by using the relay line signal protocol to set the virtual path (network-network virtual path) for the broadband integrated information network network subscriber in advance, it is easy to establish a virtual channel between the calling party and the called party, The use of a pre-configured virtual path between the originating and destination exchanges eliminates the need for additional connection control for virtual channels using this virtual path, and is simpler to connect and disconnect than the existing virtual connection type of permanent path. Since the destination number of the destination exchange only needs to be known, the same effect can be obtained by using relatively little information.

In addition, since the band of the virtual path can be easily changed using the band change function of the relay line signal protocol (BISUP), the procedure is greatly simplified compared to the conventional method of releasing and resetting the virtual path.

Claims (4)

A method for providing a virtual path (network-network virtual path) using an incoming control procedure between an originating and receiving exchange in an asynchronous delivery mode (ATM) switching system, The main processor TCCF_main of the trunk line control block that receives the initial address message (IAM) requesting the establishment of the virtual path from the originating exchange or the relay exchange generates an incoming trunk virtual path connection control child processor TCCF_vpict, and the virtual path. A first step of transmitting a message IAM_mc to the incoming trunk trunk virtual path connection control child processor TCCF_vpict; The incoming relay trunk virtual path connection control child processor TCCF_vpict receiving the message IAM_mc calls the system library of the network link resource management processing block NLRHF to request the allocation of the incoming band and the virtual channel identification number. In response to the request result, a message (IAA) indicating that the incoming network resource is valid is transmitted to the relay or originating exchange of a large country, and then the station number of the destination exchange number is translated, and the translation result of the destination exchange number is notified. And a second step of transitioning to an initial address response message waiting state (Await_IAA) after delivering a message (VP_EstabSig) for notifying a request for setting a virtual path to an administrator of the destination exchange; When a message VP_EstabACK is received from the administrator of the destination exchange to inform the establishment of the virtual path, the incoming trunk virtual path connection control child processor TCCF_vpict receives an internal switch link from the switch link resource management processing block SLRHF. It extracts the route information and transmits the point-to-point connection establishment request message (PtP_ConnEstabRQ) to the trunk line connection module controller (TIMC) to send the virtual path identification number (VPI), virtual channel identification number (VCI), network control parameter information, and internal switch. Registering link path information, transmitting a virtual path establishment complete response message (ANM) to a power station, and then transitioning to a busy state; And A fourth step of releasing the virtual aisle connection in a busy state according to the request for the release of the virtual aisle by the originating exchange manager; Method of providing a virtual passage using the incoming call control procedure at the network-network interface comprising a. The method of claim 1, The second step, A fifth step of receiving, by the incoming trunk trunk virtual path connection control child processor TCCF_vpict, an initial address message IAM_mc requesting the establishment of a virtual path; A sixth step of allocating a band and a virtual path number necessary for setting the virtual path from the relay line resource processing block; After notifying the initial address response message (IAA) that the network resource of the incoming virtual path is valid for the virtual path setting request requested by the relay or destination exchange, the station number translation block (NTLF) is called to translate the station number. A seventh step of translating the number by calling the number translation block NTCF; And An eighth step of transmitting a message requesting the establishment of a virtual path to an administrator of the destination exchange and transitioning to an initial address response message waiting state (Await_IAA); Method of providing a virtual passage using the incoming call control procedure at the network-network interface comprising a. The method according to claim 1 or 2, The process of releasing the virtual passage of the busy state at the request of the destination exchange manager of the fourth step, A ninth step of the incoming trunk trunk virtual path connection control child processor (TCCF_vpict) receiving a virtual path release message (VP_RelSig) from a destination exchange manager; Point-to-point connection establishment request message for calling the system library of the switch link resource management processing block (SLRHF) to release the internal switch link path in use and requesting the relay line connection module controller (TIMC) to delete the cell header conversion table. Step 10 of calling PtP_ConnEstabRQ and receiving the point-to-point connection establishment response message (PtP_ConnEstabRP) and the network link resource management processing block (NLRHF) to release the band and virtual channel identification number (VCI) assigned to the incoming link. ; An eleventh step of transmitting a virtual path release request message (REL) requesting the release of a virtual path to the relay or originating exchange and transitioning to a virtual path release completion wait state (Await_RLC); And Virtual Path Release Completion (RLC) In the waiting state (Await_RLC), upon receiving a Virtual Path Release Completion message (RLC) from the relay or originating exchange, a message (VP_RelSigAck) notifying the manager of the destination exchange to complete the completion of the Virtual Path Release. 12th step to deliver and exit Method of providing a virtual passage using the incoming call control procedure at the network-network interface comprising a. The method according to claim 1 or 2, The process of releasing the virtual passage of the busy state at the request of the destination exchange manager of the fourth step, A ninth step of receiving, by the incoming trunk trunk virtual path connection control child processor (TCCF_vpict), a virtual pathway release request message (REL) requesting the release of the virtual pathway from the relay or originating exchange; Point-to-point connection establishment request message for calling the system library of the switch link resource management processing block (SLRHF) to release the internal switch link path in use and requesting the relay line connection module controller (TIMC) to delete the cell header conversion table. Step 10 of calling PtP_ConnEstabRQ and receiving the point-to-point connection establishment response message (PtP_ConnEstabRP) and the network link resource management processing block (NLRHF) to release the band and virtual channel identification number (VCI) assigned to the incoming link. ; And Delivering a virtual channel release completion message (RLC) to the relay or originating exchange, and informs the administrator of the destination exchange (VP_RelSigAck) to notify the completion of the release of the virtual path to notify that the release of the virtual path is completed and terminates. 11th step Method of providing a virtual passage using the incoming call control procedure at the network-network interface comprising a.

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