KR100198446B1 - Provision methods of user-user switched virtual path connection at outgoing interference - Google Patents

Abstract

The present invention relates to an asynchronous transfer mode (ATM) switching system, and in the related art, since the virtual path can be set only by the network manager without a signaling procedure, it can be set as a semi-permanent or permanent virtual path connection. And because a lot of information, time and effort on the network configuration, there was a problem that the network administrator or user can not create a new route immediately when needed, the present invention is to solve the above problems is the broadband comprehensive information of the country When the calling subscriber of the B-ISDN requests the establishment of a user-user switched virtual path connection to the called subscriber of another broadband integrated network using the trunk line signaling protocol (BISUP), it is broadcasted at the network-network interface. By providing a user-to-user exchange virtual path connection, a virtual condensation connection can be established. And it has an effect capable of providing a virtual channel connection service, without having to perform additional signaling procedure between the calling and the called party.

Description

How to Provide User-to-User Exchange Virtual Path Connection in Outgoing Relay Lines

The present invention relates to an asynchronous transfer mode (ATM), in which a transparent connection provided by a conventional ATM layer to an upper layer is called an ATM connection. An ATM connection is a chain connection of connection elements. Is followed by an endpoint.

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

Accordingly, different virtual channel links may exist within a virtual path connection (VPC), which are distinguished from each other by the virtual path identifier (VCI) assigned to each of them.

Meanwhile, some virtual channels belonging to different virtual paths may have the same virtual channel identifier (VCI).

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

The following defines and configures virtual channel connection and virtual path connection.

The virtual channel connection (VCC) refers to connecting virtual channel links to connect between points connected to an ATM adaptation layer (AAL).

In this case, the virtual channel link refers to a unidirectional virtual connection path for transporting ATM cells 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 (VCC) may be provided via a switching device, or may be provided as a permanent or semi-permanent connection.

According to the above, the following four methods are available for establishing or releasing a virtual channel connection (VCC) at a user-network interface (UN).

First, it is set or released by reservation without going through a signaling procedure, and applies to a permanent or semi-permanent connection.

Second, use meta signaling.

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

Third, as a user-network signaling procedure, a signal virtual channel connection (VCC) is used to establish or release a virtual channel connection (VCC) for end-to-end communication.

Fourth, using a user-user signaling procedure, which uses signaling virtual channel connectivity (VCC) to establish or release virtual channel connectivity (VCC) inside a preset virtual path connection (VPC) between two user-network interfaces. It is a way.

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

In this case, the virtual path link refers to a virtual channel link group connecting 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, or may be provided permanently or semi-permanently.

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

First, a method of connecting or disconnecting 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 release a virtual path (VPC) by user control and network control.

Describing the definition of the next virtual path, the virtual path (VP) is a generic term for a bundle of virtual channel (VC) links, where all virtual channel (VC) links within the bundle have the same endpoint. Have ATM cells are explicitly assigned a virtual path identifier (VPI) for the virtual path, which identifies the virtual channel (VC) link group that shares the same virtual path connection (VPC).

Each time 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 unidirectional ability 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 (VPI) and stops when the virtual channel identifier (VPI) is removed.

In 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 channel (VC) is exchanged, a virtual path connection (VPC) supporting an input virtual channel (VC) link is first stopped, and a new virtual path connection (VPC) supporting an output virtual channel (VC) link is newly created. do.

Application of the virtual path is as follows.

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

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

The virtual path identifier (VPI) values are then translated in ATM network elements that provide cross linking or switching functions.

Secondly, a user-network virtual path connection (VPC) is established between the TB or SB reference point and the network node, and user devices are used to collectively access 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 channels (VC) in the virtual path (VP) are exchanged or cross-connected with the virtual channels (VC) in the other virtual path (VP).

On the other hand, the subscriber signaling protocol (DSS2) is a signaling protocol that originally defined signaling procedures for establishing a switched virtual channel connection at the originating and destination 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 network resource allocation and connection control such as an internal switch path.

Therefore, if you need to establish a virtual channel connection for the same originating and terminating user, there is overhead to repeat the same operation.

In addition, since the quality of service of the required virtual channel connection is different from the quality of the virtual channel connection already established 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.

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

Since the virtual path connection can bundle ATM channels in the same route and 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 the virtual path connection are reserved in advance, when the virtual channel connection is established through the virtual path connection, necessary network resource calculation can be efficiently performed, thereby increasing the efficiency of network resource management.

In order to solve the above problem, a signaling capability for establishing a virtual path connection has been added to the subscriber signaling protocol (DSS2) and the trunk line signaling protocol (BISUP), which is a broadband bearer that is an information element of a SETUP message requiring a virtual connection. Add Virtual Path (VP) Bearer Class to Capability (BBC), ignore the Virtual Channel Identifier (VCI) in the Connection Identifier information element, and only control connection to the Virtual Path Connection Identifier (VPCI) value. To do.

The DSS2 performs an exchange virtual path connection setup procedure only when the transmission class is a virtual path, and the broadband connection-oriented delivery service type-A (Broadband Connection Oriented Bearer-A) and the broadband connection-type forwarding service, where the transmission class is not a virtual path. In the case of Type-C (Broadband Connection Oriented Bearer-C) and Broadband Connection Oriented Bearer-X (BCOB-X), the existing virtual channel connection establishment procedure is performed.

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

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

2 is a relationship diagram 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 according to the present invention.

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

5A through 5G are flow charts for setting up an outgoing user-user switched virtual path connection in accordance with the present invention.

6 is a flow diagram of a relay line signaling protocol (BISUP) message for the establishment of an outgoing user-user switched virtual path connection in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

100: ALS / Broadband 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 designation adjustment 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 block (NTLF)

112: trunk line connection control block (TCCF)

200: ALS / Broadband Integrated 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 call connection control processor (CCCP)

206: broadband signal access block (BSIF)

207: SSCF

208: User 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 line block (ASLH)

302: operation maintenance processor (OMP)

303: Number translation block (NTCF)

304: Routing Control Block (RTCF)

305: MA unit 306: input / output unit

400: Intermodule Interface (IMI)

The present invention relates to a method for providing an outgoing 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. It is used to easily set up the virtual channel connection between the calling party and the called party by pre-setting the switched virtual path connection for the subscriber of the broadband integrated network.

The switched virtual path connection may be established between a user-user, a user-network, and a network-network, and the present invention particularly relates to a network-to-network interface (NNI). In this case, we want to provide the user-user exchange virtual path connection that is originating from

Therefore, when a user-user signaling procedure is used by using a preset virtual path connection between a calling party and a 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 the originating subscriber requests the establishment of a user-user switched virtual path connection that is outgoing to the destination subscriber of another country, the relay network signaling protocol is used. It provides a user-user exchange virtual path connection that is outgoing from the network interface between the calling subscriber and the called subscriber.

Therefore, the User Connection Control Function (UCCF) of the originating exchange system that receives the call / connection setup request (SETUP_ind) message requesting the establishment of a user-user switched virtual path connection sent by the originating subscriber of the home country is required. If one virtual path connection is a relay call, an internal trunk call / connection setup request (Internal Trunk SETUP, SETUPt_int) message is requested to request a virtual path connection that is outgoing to the trunk connection control function (TCCF). do.

The trunk line connection control block (TCCF) receiving the internal call / connection setup request (SETUP_int) message analyzes the call / connection setup request message (SETUP_int) and if the result requires setting up a user-user switched virtual path connection. , The allocation of the required bandwidth and the virtual path connection identifier (VPCI) to the bandwidth and the virtual path connection identifier (VPCI) of the virtual path required by the network-network interface (NNI), and user information inside the switching system. Set up a user-user switched virtual path connection for cell transmission.

In addition, after receiving a switch link information response (SwLinkInfoRP) message including internal switch link path information to a subscriber link control block (UCCF) as a response to the internal call / connection setup request message (SETUPt_int) message, Send an Initial Address Message (IAM) to the switching system.

According to the above, the trunk line connection control block (TCCF) receiving the initial address response message (IAM Acknowledge, IAA) from the destination switching system sets internal routing tag information for delivery of the user cell.

In addition, the trunk line connection control block (TCCF) receiving an answer message (ANM) from the incoming exchange system transmits an internal call connection (CONNECT int) message to the subscriber connection control block (UCCF). In the user-user exchange virtual path connection is established and the state of the virtual path connection transitions to conversation.

In addition, a trunk line connection control block (TCCF) in a busy state due to a call request by a calling party or a called party performs a release procedure of a virtual path connection, and uses a bandwidth, a virtual path connection identifier (VPCI), and an internal bandwidth. 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 according to 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) (100, 200) and asynchronous transfer mode central switching subsystem (ATM Central Switching Subsystem, ACS) 300, which consists of two subsystems.

Hereinafter, asynchronous transfer mode switching is referred to as ALS for subsystems and ACS for asynchronous transfer mode central switching system.

The ALS (100, 200) can operate as a concentrator having a constant concentrating ratio with the ACS (300).

Accordingly, the ACS 300 operates as a distribution device that performs the interconnection function between the ALSs 100 and 200.

In addition, the ALS (100, 200) is the ALS / wideband Telecommunications Network (ALS / BISDN Subscriber, ALS / S) for the user registration of the broadband integrated information network (B-ISDN) 200 ALS / broadband ALS / BISDN Trunk (ALS / T) (100) and ALS / BISDN Subscriber and Trunk (ALS / T) 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 (Central Switching Subsystem (ACS)) side is 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.

4 is a main block diagram for carrying out the establishment 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 will be described below with reference to FIG. 3.

When the originating subscriber's request for a virtual path connection occurs, the originating ALS (100, 200) detects this, performs the virtual path connection service, translates the station number under the control of the originating ALS, and then translates or forwards the number received by the ACS (300). Make an outgoing route specification 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 and notifies the originating ALS, and requests a virtual path setting to the destination subsidiary of its own station or the incoming exchange system of another country.

The originating ALS notified of the optimal internal switch link path information establishes a virtual path connection inside 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. Restore the switched virtual path connection to an idle state.

FIG. 2 is a block diagram illustrating a main call / connection processing block for performing the virtual path connection control procedure as described above.

First, as a system library block, a subscriber link resource switching block (SLRHF) 110 and 211 and a number translation in ALS function (NTLF) 111 and 212 subscriber link are provided. A resource link block (User Link Resource Handling Function, ULRHF) 210 and a network link resource handling function (NLRHF) 109.

The switch link resource processing blocks (SLRHF) 110 and 211 generate internal switch link path setting and route designation tag information of an asynchronous transmission mode cell header. And a station number translation block (NTLF) 111 and 212 are blocks for performing a destination station number translation, and a subscriber link resource processing block (ULRHF) 210 allocates a bandwidth of a subscriber link at a user-network interface and A block for processing band management, and a relay line resource processing block (NLRHF) 109 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 Signaling Interface Function (BSIF) 105, 206 controls and manages a signaling connection for reliable transmission of B-ISDN call / connection control messages. Function.

In addition, the Subscriber Service Specific Coordination Function (SSCF) block 207 blocks the wideband signal access processing blocks (BSIFs) 105 and 206 and the user connection interface to transmit subscriber signal messages. Function (UCIF) 208 performs an adjustment function.

Subscriber Connection Access Block (UCIF) 208 also performs the access function of the subscriber signaling message.

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

The trunk service specific coordination function 106 is a broadband signal access processing block (BSIF) and an MTP-3 signaling message handling function (SMHF) for delivering a trunk line signaling message. Perform an adjustment function between 107.

The MTP signaling message processing block (SMHF) 107 performs an MTP-3 function in No. 7 signaling.

A trunk connection interface block (TCIF) performs an MTP signal message transfer function between the MTP signal message processing block (SMHF) 107 and the trunk connection control block (TCCF).

In addition, the trunk line connection control block (TCCF) 303 performs B / ISDN user part (BISUP) call / connection control.

There is also a Number Translation in ACD (NTCF) 300 for calling party number translation and a Routing Control Function (RTCF) 304 that performs routing designation control.

5A to 5G are flow charts for setting up an outgoing user-user switched virtual path connection according to the present invention.

And FIG. 6 is a flow chart of a relay line signaling protocol (BISUP) message for setting up outgoing user-user switched virtual path connections according to FIG.

Referring to the drawings, a procedure for providing a user-user exchanged virtual path connection that is specifically broadcasted is described as follows.

FIG. 5a illustrates the outgoing relay line virtual path connection control child process (Outgoing) for the main process (TCCF_main) of the relay line connection control block (TCCF) to perform the establishment of the user-user switched virtual path connection at the network-network interface (NNI). The following shows the procedure for creating a Trunk Virtual Path Connection Control Child Process (TCCF_vpogt).

5b to 5f are diagrams of a user-user switched virtual path connection in which the outgoing relay line virtual path connection control child process TCCF_vpogt generated by the main process TCCF_main of the relay line connection control block is relayed at the network-network interface. The provision procedure is shown.

In the above procedure, the main process TCCF_main of the trunk line connection control block receiving the internal call / connection setup request (SETUPt_int) (s1) message originating from the subscriber's originating virtual path connection control child process (UCCF_vporg) is called. As a result of determining the setup setup request (SETUPt_int) (S2), the bearer class (BS) of the broadband bearer capability (BBC) information element is a virtual path (VP) and a connection identifier information element. If it includes only the Virtual Path Connection Identifier (VPCI), it is determined that the user-user exchanged virtual path connection is required to generate the outgoing relay line virtual path connection child process TCCF_vpogt (S3).

However, the call / connection establishment request message has a BBS information element's class of delivery (BS) of Broadband Connection Oriented Bearer Service-A (BCOB-A), and Broadband Connectivity Transport Service Type C. (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 setup of the virtual channel connection is required, thereby creating an outgoing trunk virtual channel connection control child process (TCCF_vpogt). S4).

The subscriber connection control main process is UCCF_main, the trunk line connection control main processor is TCCF_mail, the destination subscriber virtual path connection child process is UCCF_vpdes (Destination User Virtual Path Connection Control Child Process), and the originating subscriber virtual path connection control child process is UCCF_vporg (Origination User). Virtual Path Connection Control Child Process, Incoming Trunk Virtual Path Connection Control Child Process (TCCF_vpict) and Outgoing Trunk Virtual Path Connection Control Child Process (TCCF_vpict) TCCF_vpogt.

When the generated TCCF_vpogt receives an initial address message (Main-to-Child IAM, IAM_mc) message requesting the establishment of a virtual path connection from TCCF_main (S5), the network resource available by calling the relay line link resource processing block (NLRHF) After checking and assigning (S6), the system library of the switch link resource processing block (SLRHF) is called to set an internal switch link path between the originating ALS and the terminating ALS (S7).

If all of the above procedures are successful, TCCF_vpogt forwards the switch link information response (SwLinkInfoRP) (S8) message to UCCF_vporg and forwards the initial address message (IAM_req) (S9) to the destination switching system and then waits for the initial address response (Await_IAA). Transition to S10.

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

When TCCF_vpogt receives an initial address response message (IAA_ind) (S11) from the initial address response wait state (Awaiit_IAA) to the destination switching system, the TCCF_vpogt registers a virtual path identifier to the trunk line connection module controller (TIMC) (S12) and controls network parameters. A message including information for Network Parameter Control (NPC) is transmitted to a trunk interface module controller (TIMC) (S13) to set an internal routing tag.

The process then transitions to the response wait state Await_ANM S14.

When TCCF_vpogt receives a response message (ANM_ind) (S15) from the destination switching system in response wait state (Await_ANM) (S14), the establishment of a user-user switched virtual path connection requested by UCCF_vporg is completed between the originating and destination switching system. After the internal connection completion message (Internal Connect, Connect_int) (S16) to notify that the message has been delivered, the transition to the conversation (Conversation) state (S17).

From this point, the user information cell can be delivered 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 party or the called party.

In the case where the virtual path connection release procedure is performed at the request of the originating subscriber, the originating subscriber starts by sending a call / connection release request (RELEASE_req) message to UCCF_vporg of the originating exchange system.

TCCF_vpogt receiving the call / connection release request (RELEASE_int) (S18) message from the UCCF_vporg determines whether a virtual channel connection exists in the virtual path connection before releasing the virtual path connection (S19) and as a result, the virtual channel connection exists. If it is (S22), the virtual channel connection is released first, and then the release procedure of the virtual path connection is started.

The TCCF_vpogt calls the system library of the switch link resource processing block (SLRHF) to release the internal switch path corresponding to the virtual path connection (S20) and requests the release of the virtual path identifier to the trunk line connection module controller (TIMC) (S21). ).

It also releases outgoing paths and bands to the destination switching system assigned to the routing control block (RTCF) (S23) and calls the relay line link resource control block (NLRHF) to assign the band and virtual path connection identifiers assigned to the relay line links ( VPCI) is released (S24).

In order to request release of the virtual path connection to the called subscriber, a call / connection release request (REL_req) (S25) message is transmitted to the called exchange system, and the call / connection release completion wait state (Await_RLC) (S26) is transferred.

TCCF_vpogt, which has received a Release Complete Indication RLC_ind (S27) message from the called subscriber, indicating that the release of the virtual path connection has been completed, establishes a user-user switched virtual path connection established between the calling party and the destination switching system. The TCCF_vpogt is released (S28).

When 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_ind) (S29) message to UCCF_vpdes of the called exchange system.

TCCF_vpogt receiving the call / connection release request (RELEASE_ind) message from the destination exchange system determines whether a virtual channel connection exists in the virtual path connection before releasing the virtual path connection (S30), and as a result, the virtual channel connection exists. In case S33, the virtual channel connection is released first, and then the release procedure of the virtual path connection is started.

The TCCF_vpogt calls the system library of the switch link resource management processing block (SLRHF) to release the internal switch path corresponding to the virtual path connection (S31) and requests the deletion of the internal routing tag information to the trunk line connection module controller (TIMC). (S32).

The outgoing route and the band to the destination switching system allocated to the routing control block (RTCF) are released (S34), and the relay line link resource control block (NLRHF) is called to allocate the band and virtual path connection identifiers assigned to the relay line link ( After release of the VPCI (S35), a call / disconnect request (RELEASE_ind) message (S36) is transmitted to UCCF_vporg.

After the delivery of the call / connection release completion (RLC_req) (S37) message to inform the destination exchange system that the release of the virtual path connection is complete, the user-user exchange virtual path connection established between the originating and destination exchange system is released. TCCF_vpogt ends (S38).

A method for providing a user-user switched virtual path connection that is outgoing from the network-network connection surface according to the above description may include a user-user switched virtual path connection between an originating switching system and a destination switching system by using a relay line signaling protocol (BISUP). It is possible to provide a user-user switched virtual path connection between originating and terminating subscribers by performing the virtual path establishment procedure for the originating subscriber of another country or another station that requires It has the effect of providing a service to a called subscriber of another station in response to an Asynchronous Transfer Mode (ATM) service request of the subscriber.

According to the present invention, a calling subscriber of a local switching system in a Broadband Interated Services Digital Network (B-ISDN) sets up a user-user switched virtual path connection to a called subscriber of another country. User who is outgoing between originating and receiving subscriber using B-ISDN User Part (BISUP), which is a trunk line signaling protocol, at network-network interface (NNI). It aims to provide a user switched virtual path connection.

Claims (7)

In the asynchronous transmission mode (ATM) switching system, a network-network is established to establish a virtual path connection between incoming subscribers of other stations in response to a request for setting up an outgoing user-user switched virtual path connection required by the originating subscriber of the local station. In the method of providing a user-user switched virtual path connection that is outgoing from the connection surface, when receiving an internal call / connection setup request (SETUPt_int) message requesting a switched virtual path connection from the UCCF_vporg of the originating switching system of the local station, A first step of TCCF_main generating a relay trunk virtual path connection control child process TCCF_vpogt; When the generated outgoing relay line virtual path connection control child process TCCF_vpogt receives an initial address message IAM_mc requesting the establishment of the switched virtual path connection from the main process TCCF_main of the relay line connection control block, the requested virtual Calls the system library of the trunk line link resource processing block (NLRHF) for the path connection, assigns the required band and virtual path connection identifier (VPCI), sets up the internal switch link path using the reserved switch link information, and sends it to UCCF_vporg. Delivers a switch link information response (SwLinkInfoRP) message informing that an internal switch link path for transmission of a user information cell has been established, forwards an initial address message (LAM_req) to a terminating exchange system, and sends an initial address response wait state (Await_IAA) A second process of transitioning; After receiving the initial address response message (IAA Acknowledge) from the incoming exchange system, the trunk line connection module controller (TIMC) uses a point-to-point connection establishment request message (PtP_ConnEstabRQ) and a point-to-point network control parameter information message (PtP_NPCInformation). Registering a path identifier (VPI), network control parameter (NPC) information, and internal routing tag information and transitioning to an Await_ANM; After receiving the response message (ANM_ind) from the terminating exchange system, the internal connection completion (Connect_int) message is notified to UCCF_vporg that the establishment of the switched virtual path connection is completed between the originating and terminating exchange system to indicate the state of the virtual path connection. A fourth process of making 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; And a sixth step of performing the procedure of releasing the busy virtual path connection by the request of the release of the virtual path of the called subscriber after the fourth step. How to provide a connection. 2. The internal call / connection setup request (SETUP_int) message according to claim 1, wherein the first process originates from the originating subscriber virtual path connection control process (UCCF_vporg) for a virtual path connection initiated by a request of the originating subscriber of the home country. The first step of receiving a second step and the main process (TCCF_main) of the relay line connection control block after receiving the second step of generating the outgoing relay line virtual path connection child process (TCCF_vpogt) to establish the outgoing switched virtual path connection Method of providing a user-user exchange virtual path connection that is relayed, characterized in that it comprises a. 2. The method of claim 1, wherein the second process includes an initial address message IAM_mc for which the outgoing relay line virtual path connection control child process TCCF_vpogt requests to establish a virtual path connection from the main process TCCF_main of the relay line connection control block. Receiving a first step; After the reception, the system library of the relay line link resource processing block (NLRHF) is called to allocate a band and virtual path connection identifier (VPCI), and the reserved switch link information included in the call / connection establishment request (IAM_mc) message is received. A second step of calling a system library of a switch link resource processing block (SLRHF) for establishing an internal switch link path for transmission of a user information cell; After the system library call, the switch link information response (SwLinkInfoRP) message including the internal switch link path information determined by UCCF_vporg is delivered, and the initial address message (IAM_req) requesting the establishment of the virtual path connection is delivered to the destination switching system. And a third step of transitioning to an initial address response wait state (Await_IAA). The method of claim 1, wherein the third process includes receiving an initial address response message (IAA) from the destination switching system and forwarding the virtual path identifier (VPI), network parameter control (NPC) information to the trunk line connection module controller (TIMC). A method for providing an outgoing user-to-user switched virtual path connection characterized by transferring PtP_ConnEstabRQ and PtP_NPCInformation messages and transiting to Await_ANM to register internal routing tag information. The internal connection of claim 1, wherein the fourth process includes receiving a response message (ANM) from the destination switching system and notifying UCCF_vporg that a request for establishing a user-user switched virtual path connection between the originating and destination switching system is completed. A second step of transmitting a completion (CONNECT_int) message; and a second step of transitioning a state of the virtual path connection to conversation after the transmission. How to Provide. The method of claim 1, wherein the fifth process is a procedure of releasing a virtual path connection in a busy state at the request of an originating subscriber, and TCCF_vpogt is a first step of receiving a call / disconnection request (RELEASE_int) message from UCCF_vporg; ; After receiving, a second step of calling a system library of a switch link resource processing block (SLRHF) to release the internal switch link path in use and requesting the relay line connection module controller (TIMC) to delete the internal routing designation information; After the request for deleting the information, requesting the release of the outgoing route and the band set to the routing designation block (RTCF) and calling the relay line link resource control block (NLRHF) to release the band and virtual path connection identifiers assigned to the relay line link. Step 3; After the release, transmitting a call / connection release request (REL_req) message to the incoming exchange system and transitioning to a call / connection disconnection completion wait state (Await_RLC); After the transition, after receiving the call / connection release completion (RLC_ind) message from the destination exchange system in the Await_RLC state, TCCF_vpogt includes a fifth step of terminating. Manufacturing method. The method of claim 1, wherein the sixth step is a procedure of releasing a virtual path connection in a busy state at the request of a called subscriber, and after receiving a call / disconnection request (REL_ind) message from the called exchange system, TCCF_vpogt is switched. Calling a system library of a link resource processing block (SLRHF) to release an internal switch link path in use; After the release, a request is made to the trunk line connection module controller (TIMC) to delete the internal routing tag information, a release of the outgoing path and the band set to the routing block (RTCF), and the relay line resource control block (NLRHF) is called. Releasing the allocated band and virtual path connection identifier of the relay line link by a second step; After the release, TCCF_vpogt is terminated after delivering the internal call / connection release request (RELEASE_int) message to UCCF_vporg and the call / connection release completion (RLC_req) message to the destination exchange system. How to provide a virtual path connection.