KR20020023055A - Method for linking a switched virtual circuit and permanent virtual circuit in an exchange system - Google Patents

Abstract

PURPOSE: A method for interlocking an SVC(Switched Virtual Circuit) and PVC(Permanent Virtual Circuit) service call in a data switch is provided to remove the load of a specific service subscription or an additional installation of an SVC terminal by processing an SVC service and PVC service interlocking function in the data switch. CONSTITUTION: An SVC subscriber matching unit performs a layer 2 control of a call setting message, certifies a state and an error of a layer 3, and transmits a service element to a data call to a main control unit(S511). The main control unit certifies a received message, and certifies use right to an SVC subscriber terminal and requested service item(S512). If it is judged as a subscriber state to be impossible to receive a data service or a subscriber who is not registered in a service, the SVC subscriber terminal, the SVC subscriber matching unit, and the main control are mutually interlocked for releasing the data call and notifying that a termination call is released to a data process unit, and resources associated with the call is recovered(S513,S523,S585). In case that the call is a call which is not terminated to a PVC subscriber, the main control unit processes an SVC termination call(S515,S540). In case that the call is a call which is terminated to a PVC subscriber, the main control unit assigns logic channel information which is not on a previously connected PVC path or a logical channel for a specific SVC connection(S515-S517). The main control unit generates a message for informing that the call process progresses through SVC subscriber matching unit to transmit the message to the SVC terminal, assigns a new link of the SVC data process unit, notifies intrinsic value information for indicating an object data processor, and transmits a range of the logical channel interlocked with a PVC and data through a common bus to the SVC data processing unit(S517-S519,S581,S591). The main control unit transmits a connection message for informing that a termination side and an origination side are connected to the SVC subscriber terminal(S520).

Description

METHODS FOR LINKING A SWITCHED VIRTUAL CIRCUIT AND PERMANENT VIRTUAL CIRCUIT IN AN EXCHANGE SYSTEM}

The present invention relates to a switched virtual circuit (hereinafter referred to as SVC) and permanent virtual circuit (hereinafter referred to as PVC) service call interworking technology in a data exchange, and in particular, SVC service The present invention relates to a method of interworking an SVC service call with a PVC service call in a data exchange (including a broadband / narrowband integrated information network) capable of processing.

As is well known, the SVC service is a service type in which a data call is connected according to a specific user-network signaling method at the request of a subscriber station, and the PVC service is a service type that delivers only data without using a user-network signaling method. Conventional data communication networks provide SVC service using signaling method and PVC service without signaling method independently.

1 is a schematic diagram of each of SVC and PVC services in such a data exchange.

First, the PVC service in the data communication network 100 is serviced by permanently providing a path 113 between the PVC terminals 102 and 104 without a user-network signal. The SVC service in the data communication network 100 provides a path 103 by performing a call connection procedure through a user-network signal between the subscriber terminals 102 and 104 for SVC connection and the data communication network 100. A service release is performed by performing a call release procedure through a user-network signal between the subscriber terminal 102, 104 for SVC connection, and the data communication network 100 to release the connected path.

At this time, these SVC and PVC services are not directly connected in the data communication network 100 due to the difference in the use of the user-network signal, the information service provider 130 and the user for the SVC service interworking with the data communication network 100 in PVC In the case of interworking with the terminal 106, a means of a specific apparatus is required. That is, the information service provider 130 or the data communication network 100 operator separately installs the gateway / remote access server 120 to interwork the SVC service path 105 and the PVC service path 115.

FIG. 2 is a detailed block diagram illustrating an operation principle of the interworking system, and illustrates a block interworking technique for providing a PVC service and an SVC service in a data exchange.

First, the data exchanger 200 for the SVC and PVC service is the SVC subscriber matching unit 202, 204, PVC subscriber matching unit 212, 214, switch processing unit 220, PVC data processing unit 234 And a data switch 230 including an SVC data processor 232, a common bus 240 that provides a connection path between a plurality of data processors, or a traffic switch that replaces the common bus 240, and a main controller responsible for overall call control. Control unit 250, and number processing unit 260 that can find the destination point through the number translation, respectively.

In general, the PVC service includes registration information for the PVC subscriber matching units 212 and 214 in a separate database (not shown) provided in the main control unit 250 at the time of adding an initial or new PVC service subscriber. Information about the PVC data processor 234 and the corresponding path (the switch processor 220 path and the common bus 240 path) is prepared. Subsequently, the main controller 250 refers to the PVC database, and the switch paths 276 and 278 between the PVC subscribers 112 and 114 and the PVC data processing unit 234, the two paths 276, The common bus 240 connecting the paths 278 or the destination information or channel assignment information for the paths may be stored in the PVC data processing unit 234 to perform its own data transmission processing in the PVC data processing unit 234. To be able. Data transmitted from the subscriber terminal 112, 114 for PVC access through the PVC path set by this process is processed in the PVC data processing unit 234 via the PVC subscriber matching unit 212, 214 and another Delivered to the subscriber terminal.

The SVC service prepares registration information for the SVC subscriber matching units 202 and 204 in a separate database provided in the main control unit 250 at the time of adding an initial or new SVC service subscriber. When the SVC subscriber matching unit 102 or 104 detects a call setup message from the SVC subscriber matching unit 202 or 204, the call setting message is transmitted to the main control unit 250 through service classification and verification of the message. do. The main controller 250 analyzes the call setup message, extracts the called number, and makes a number translation request to the number processing unit 260 to find the called SVC subscriber matching units 204 and 202. Then, the main control unit 250 transmits a message according to the incoming call setting to the incoming SVC subscriber matching unit 204 and 202, while allocating to the incoming / outgoing SVC data processing unit 232 and the switch processing unit 220. ) To set the path of the data exchanger 200 by performing a function such as connection instruction, storage of base data according to the connection of the common bus 240, and notification to the SVC data processor 232. Subsequently, the main control unit 250 communicates with each of the subscriber terminal 102, 104 for SVC connection through the originating SVC subscriber matching unit 202, 204 and the incoming SVC subscriber matching unit 204, 202. The call setup procedure is completed by transmitting and receiving a message according to the call connection, and it is possible to transmit and receive data between each of the subscriber terminal 102, 104 and the data exchange 200 for each SVC connection.

As described above, in the conventional data service scheme, a separate independent device, such as a gateway or a remote access server, may be used for interworking the SVC service and the PVC service, and a separate service subscription or SVC terminal for SVC call access of the PVC subscriber is available. The issue has been raised that additional installation burdens are involved. In addition, the existing PVC service subscribers have to install a new SVC terminal to switch the information service, there was a problem that a lot of restrictions in providing data services.

Accordingly, the present invention has been made to solve the above-described problem, so that it is possible to set up another SVC incoming call in the state of the PVC connection so that the incoming call to the predetermined PVC call without additional service subscription or purchase of the SVC terminal. The purpose is to provide a SVC and PVC service call interworking method in the data exchange.

In order to achieve this object, the present invention provides a data processing unit including a switched virtual line subscriber matching unit, a permanent virtual line subscriber matching unit, a switch processing unit, a permanent virtual line data processing unit and a switched virtual line data processing unit, Interworking virtual exchange and permanent virtual line service call interworking in a data exchanger having a common bus providing a connection path between data processing units, a number processing unit identifying a destination point through number translation, and a main control unit for overall call control A method, comprising: a first step of transmitting, from a switched virtual circuit subscriber terminal, a call setup message to a switched virtual circuit subscriber matching unit, the call setting message comprising a parameter indicating a data call and information on a called point; A second step of performing layer 2 control of a call establishment message, verifying a state and error for layer 3, and delivering a service element for a data call to a main control at the switched virtual line subscriber matching unit; A third step of verifying a message received from the main control unit and verifying a usage right and requested service matters for the switched virtual circuit subscriber station; As a result of the verification in the third step, if it is determined that the subscriber state cannot receive data service or the subscriber is not registered, the switched virtual circuit subscriber terminal, the switched virtual circuit subscriber matching unit, and the main controller interoperate with each other to release the data call. Restoring resources associated with the call by notifying the data processor that the outgoing call is released; As a result of the verification in the third step, when it is determined that the subscriber state can receive data service, the number processing unit is requested to translate the number of the called number extracted from the information of the data call setup layer 3 to the number processing unit. A fifth step of transmitting to the main controller; A sixth step of performing, by the main control unit, a switched virtual line incoming call process when the number translation is not a call that is received by the permanent virtual line subscriber; A seventh step of allocating a logical channel for a separate switched virtual line connection or a logical channel information that is not in use on a pre-connected permanent virtual line path when the number is reached as a result of the number translation; Generates a message indicating that call processing is in progress through the switched virtual circuit subscriber matching unit, and transmits the message to the switched virtual circuit terminal, allocates a new link of the switched virtual circuit data processing unit, and notifies the unique value information indicating the data processor of the counterpart. An eighth step of performing a data transmission through a common bus and a range of logical channels that can be used in association with a permanent virtual line to the virtual line data processor; A ninth step of transmitting, by the main controller, a connection message indicating that both the called party and the calling party are connected to the switched virtual circuit originating subscriber terminal; A tenth step of analyzing layer 2 control and layer 3 information of the message received by the switched virtual circuit subscriber matching unit, verifying the status and error of the layer 3 of the connection confirmation message, and delivering the reconstructed message to the main control unit; ; An eleventh step of notifying, by the main control unit, that the call is connected to the switched virtual line and the permanent virtual line data processing unit, and maintaining a subscriber connection state until the connected switched virtual line / permanent virtual line call is released; The switching virtual line and the permanent virtual line data processing unit transition the current state to the data transmission state, and exchange the data received from the switching virtual line and the permanent virtual line subscriber station via the common bus until the release message is received. And a twelfth step of transmitting the data to the permanent virtual line data processing unit, and performing data transfer between the permanent virtual line subscriber stations. .

1 is a schematic configuration diagram of a switched virtual circuit and a permanent virtual circuit service call interworking system in a conventional data exchanger;

2 is a block diagram illustrating a configuration of a switched virtual line and a permanent virtual line service call interworking system in a conventional data exchanger;

3 is a schematic configuration diagram of a switched virtual line and a permanent virtual line service call interworking system in a data exchange according to a preferred embodiment of the present invention;

4 is a block diagram illustrating a configuration of a switched virtual line and a permanent virtual line service call interworking system in a data exchange according to a preferred embodiment of the present invention;

5 is a detailed flowchart illustrating a process of implementing interworking between a switched virtual line and a permanent virtual line service call in a data exchange according to an exemplary embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

100: data communication network

102, 104, 106: subscriber station for switched virtual line access

103, 105, 272, 274: switched virtual line connection path

112, 114: subscriber terminal for PVC connection

113, 115, 276, 278: permanent virtual circuit connection path

120: gateway / remote access server

130: information service provider

200: data exchanger

202 and 204: switched virtual circuit subscriber matching unit

212, 214: permanent virtual circuit subscriber matching unit

220: switch processing unit

230: data processing unit

232: switched virtual line data processing unit

234: permanent virtual line data processing unit

240: common bus

250: main fisherman

260: number processing unit

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

3 is a schematic structural diagram of an SVC and PVC service call interworking system in a data exchange according to a preferred embodiment of the present invention, and shows a path of an SVC-PVC service.

As shown, the PVC service in the data communication network 100 is serviced by permanently providing a path 113 between user terminals 112 and 114 for PVC connection without user-network signal. When there is a call connection request from another SVC terminal 102 to an existing PVC terminal 114 in the state of making such a connection, some of the logical channels used in the preset PVC path 113 are transferred to the SVC terminal 102. The SVC path 107 is added to allocate a new SVC call connection.

In addition, when cutting the SVC call during the connected PVC and SVC service, the logical channel resource used in the SVC is restored to the resources of the PVC path while cutting the SVC path 107. That is, the PVC subscriber can perform the SVC call access without additional service subscription or additional installation of the SVC terminal.

4 is a block diagram illustrating a configuration of a switched virtual line and a permanent virtual line service call interworking system in a data exchange according to an exemplary embodiment of the present invention, and a block for providing PVC service and SVC service in the data exchange 200. Indicates interlocking technology.

As shown in FIG. 4, the data exchanger 200 for the SVC and PVC service includes the SVC subscriber matching unit 202, 204, the PVC subscriber matching unit 212, 214, the switch processing unit 220, A data processing unit 230 including a PVC data processing unit 234 and an SVC data processing unit 232, a common bus 240 providing connection paths between a plurality of data processing units, or a traffic switch replacing the common bus 240; Each of the main control unit 250 in charge of the overall call control, and the number processing unit 260 that can find the destination point through the number translation. The block diagram of FIG. 4 is similar to the block diagram of FIG. 2 described above, and thus a detailed function description thereof will be omitted.

Hereinafter, a detailed description will be given with reference to a flowchart of FIG. 5 attached to a switched virtual circuit and a permanent virtual circuit service call interworking implementation process in a data exchange according to an exemplary embodiment of the present invention.

Prior to the description, in this process, each PVC subscriber should be assigned a PVC subscriber number which is distinguished from the SVC subscriber for SVC incoming call processing, and the SVC subscriber is distinguished from the number management database of the number processing unit 260 of FIG. Information on the differentiation between the and subscribers should be stored. In addition, the main control unit 250 for configuring the PVC paths 276 and 278 stores logical channel configuration data and PVC data processing unit 234 for the PVC call connection, and the PVC data processing unit 234. Suppose that logical channel information being used for data transmission is periodically reported or managed separately, or the logical channel for SVC connection is managed separately so that the logical channel available when an SVC incoming call connection request is detected at any moment can be allocated. do.

In addition, in the detailed process of FIG. 5, the case where the PVC subscriber stations 112 and 114 are talking and the SVC subscriber station 104 attempts to call the PVC subscriber station 112 will be described as an example.

As shown in FIG. 5, in the state where the data exchange 200 is operated, the SVC subscriber station 104 sends a call setup message including information on a call point and parameters indicating a data call. It forwards to the SVC subscriber matching unit 204. Receiving the data call setup message, the SVC subscriber matching unit 204 verifies the state and error for layer 3 while performing layer 2 control of the call setup message, and delivers the service element for the data call to the main controller 250. (S511).

Receiving the service element for the data call, the main control unit 250 verifies the received message to verify the service element, retrieves a database provided separately in the main control unit 250 to the SVC subscriber station 104 Verify the usage rights and service requirements for (S512).

If the verified result is determined to be a subscriber state that cannot receive data service or a subscriber who is not registered with the service, the SVC originating subscriber station 104, the SVC subscriber matching unit 204, and the main control unit 250 interoperate with each other. And releases the data call and notifies the data processing unit 230 that the outgoing call is released so that the data processing unit 230 recovers the resources associated with the call (S513) (S523) (S585).

If the verified result is determined to be a subscriber state capable of receiving data service, the number processing unit 260 requests a number translation from the called number extracted from the information of the data call setup layer 3. The number translation result of the number processing unit 260 is transmitted to the main control unit 250, the main control unit 250 receiving the number translation result is whether the number translation result is a call to the PVC subscriber 112 or 114 If it is determined that the call is not a call to the PVC subscriber 112 or 114, the same process as the existing SVC incoming call processing, and when the call to the PVC subscriber 112, the data corresponding to the PVC subscriber 112 The processor 234 finds a database and allocates logical channel information that is not in use on the existing connected PVC paths 276 and 278 or a logical channel prepared for a separate SVC connection. At this time, if the allocated logical channel is established within the existing PVC logical channel range, PVC data processing unit 234 for processing the data frame of the other PVC subscriber 114 that does not talk to the SVC subscriber station 104 Inform the changed logical channel information in the () to enable the PVC path 234 to limit the use of the logical channel used in the SVC (S515), (S516), (S540).

The main control unit 250 that allocates the logical channel generates a message informing that the call processing is in progress through the SVC subscriber matching unit 204, and transmits the message to the SVC subscriber station 104 and transmits a new link of the SVC data processing unit 232. The other side's data processor for data transfer through the common bus 240-or a traffic switch replacing the common bus 240-and the range of logical channels available in conjunction with the PVC to the SVC data processor 232. Intrinsic value information is referred to (S517 to S519), (S581), and (S591).

After performing these steps, the main control unit 250 notifies that both the called party and the calling party are connected by passing the connection message to the SVC subscriber station 104 via the SVC subscriber matching unit 204 (S520). .

At this time, the SVC subscriber matching unit 204 receiving the connection confirmation message from the originating SVC subscriber station 104 performs layer 2 control of the received message, analyzes the information of layer 3, and layer 3 of the connection confirmation message. The reconstructed message is transmitted to the main controller 250 by verifying the state and error of the.

Receiving the connection confirmation message, the main control unit 250 notifies that the call is connected to the SVC and PVC data processing units 232 and 234 to inform that the current data transmission state.

Thereafter, the main controller 250 maintains the subscriber connection state until the connected SVC-PVC call is released (S512 to S530), (S582), and (S592).

The SVC and PVC data processing units 232 and 234 that have been informed that each SVC-PVC call has been established transition their state to the data delivery state, and then, the SVC and PVC subscriber station 104 until receiving a release message. The data received from 112 is forwarded to the other side PVC and SVC data processing units 232 and 234 via a common bus 240 or a traffic switch that replaces the common bus 240, while the PVC subscriber Data transfer is performed between the terminals 112 and 114 (S583), (S584), (S593) and (S594).

On the other hand, when the release message for the SVC call is received, the PVC data processing unit 234 restores the resource information allocated to the SVC and maintains the PVC data transmission state, and the SVC data processing unit 232 restores and operates the SVC resource. On the other hand, a call release procedure is performed between the main control unit 250 and the SVC subscriber station 104 (S595), (S596), (S585), (S586), and (S523).

As mentioned above, preferred embodiments of the present invention have been described in detail, but are not necessarily limited thereto, and various embodiments, for example, an information service provider network construction using a PVC line without departing from the claims of the present invention described below. Obviously, the method could be implemented. That is, in the initial stage of the system, the PVC data processing unit and the PVC subscriber terminal only configure the PVC path, storing logical channel information for interworking with the SVC in a database indicating the PVC subscriber terminal, and PVC data interworking with the PVC subscriber terminal. The SVC dial-up service by the SVC-PVC interworking procedure may be implemented except for notifying the changed logical channel information to the processor.

Accordingly, the present invention allows PVC subscribers to access SVC calls by processing SVC service and PVC service interworking functions that are processed using a separate independent device, such as a gateway or a remote control access server, in a data exchange (including a wideband / narrowband integrated information network). It eliminates the additional installation burden for the separate service subscription or SVC terminal, and has the effect of granting a new data service environment without additional installation of a separate gateway, remote access server.

Claims (3)

A common bus providing a connection path between a plurality of data processing units, a data processing unit including a switched virtual line subscriber matching unit, a permanent virtual line subscriber matching unit, a switch processing unit, a permanent virtual line data processing unit, and a switched virtual line data processing unit. In the exchange virtual line and permanent virtual line service call interworking method in a data exchange having a number processing unit for confirming the incoming point through the number translation and the main control unit for the overall call control, A first step of transmitting, from the switched virtual circuit subscriber terminal, a call setup message including a parameter indicating a data call and information on a called point to the switched virtual circuit subscriber matching unit; A second step of performing layer 2 control of a call establishment message in the switched virtual circuit subscriber matching unit, verifying a state and error for layer 3, and delivering a service element for a data call to the main control unit; A third step of verifying a message received by the main control unit and verifying a usage right and requested service matters for the switched virtual circuit subscriber station; As a result of the verification in the third step, when it is determined that the subscriber state cannot receive data service or the subscriber who has not registered the service, the switched virtual circuit subscriber terminal, the switched virtual circuit subscriber matching unit, and the main control unit interoperate with each other. A fourth step of recovering resources associated with the call by releasing the call and notifying the data processing section that the outgoing call is released; As a result of the verification in the third step, when it is determined that the subscriber state can receive data service, the number processing unit requests the number translation of the called number extracted from the information of the data call setup layer 3, and the number processing unit translates the number. Transmitting a result to the main controller; A sixth step of performing, by the main controller, a switched virtual line incoming call process when the number translation is not a call that is received by a permanent virtual line subscriber; A seventh step of allocating logical channel information or a logical channel for a separate switched virtual line connection that is not in use on the connected permanent virtual line path when the call is received as a result of the number translation; A message indicating that call processing is in progress is generated through the switched virtual line subscriber matching unit and transmitted to the switched virtual line terminal, the new link of the switched virtual line data processing unit is allocated, and unique value information indicating a counterpart data processor is provided. An eighth step of notifying the switched virtual line data processing unit to perform data transfer over the common bus and a range of logical channels usable in association with a permanent virtual line; A ninth step of transmitting, by the main controller, a connection message indicating that both the called party and the calling party are connected to the switched virtual circuit originating subscriber terminal; A tenth step of analyzing layer 2 control and layer 3 information of the message received by the switched virtual circuit subscriber matching unit, verifying the status and error of the layer 3 of the connection confirmation message, and delivering a reconstructed message to the main control unit; Steps; An eleventh step of notifying, by the main control unit, that the call is connected to the switched virtual line and permanent virtual line data processing unit, and maintaining a subscriber connection state until the connected switched virtual line / permanent virtual line call is released; The partner virtual line and the permanent virtual line data processing unit transition the current state to the data transfer state, and the other side via the common bus until the release message received data received from the switched virtual line and the permanent virtual line subscriber station Interworking with the switched virtual circuit and the permanent virtual circuit service call in the data exchange, characterized in that it comprises a twelfth step of transferring to the switched virtual circuit and the permanent virtual circuit data processing unit, and performing data transfer between the permanent virtual circuit subscriber terminal. Way. The method of claim 1, The main controller stores the logical channel configuration data for the permanent virtual line call connection and the information on the permanent virtual line data processor, and periodically exchanges the logical channel information being used for data transmission from the permanent virtual line data processor. A method for interworking a switched virtual line and a permanent virtual line service call in a data exchange, comprising allocating a logical channel available when a virtual line incoming call connection request is detected. The method of claim 1, The seventh step, If the allocated logical channel overlaps with the established permanent virtual circuit logical channel, changing the logical channel so as not to use the logical channel in a database managing another permanent virtual circuit subscriber not talking to the switched virtual circuit subscriber terminal; ; By notifying the changed logical channel information to the permanent virtual circuit data processing unit that processes data frames of other permanent virtual circuit subscribers not talking to the switched virtual circuit subscriber terminal, the use of the logical channel used in the switched virtual circuit in the permanent virtual circuit path is restricted. A method of interworking with a switched virtual line and a permanent virtual line service in a data exchange, characterized in that it comprises a step of performing.