KR20010073666A - Method of svc message generation and parameters management in svc proxy function for interworking between frame relay svc and pvc - Google Patents

Abstract

PURPOSE: A method for generating a message in an SVC(Switched Virtual Channel) proxy for the interworking of PVC(Permanent Virtual Channel) and the SVC, and a method for managing message parameter information, are provided to implement a management table for mutually mapping related information for the interworking of a PVC function and an SVC function. CONSTITUTION: The first management table is configured, for managing a PVC(Permanent Virtual Channel) state and information related to a subscriber managed by an SVC(Switched Virtual Channel) proxy by the unit of subscriber. The second management table is configured, for managing a call connection state and parameter information related to an SVC message managed by the proxy by the unit of call number. A message of PVC is received and analyzed in the SVC proxy, to change information of the corresponding subscriber of the first management table and process response according to the kind of the received message. A signaling message inputted from the SVC proxy is received, to store/change information loaded on the message and call state information in the second management table. A signaling message from the SVC proxy is generated and transmitted referring to the second management table, and a call state is managed in the second management table.

Description

METHODS OF SVC MESSAGE GENERATION AND PARAMETERS MANAGEMENT IN SVC PROXY FUNCTION FOR INTERWORKING BETWEEN FRAME RELAY SVC AND PVC}

The present invention provides a method of generating a message and managing message parameter information in a switchable virtual connection (SVC) proxy for interworking a Permanent Virtual Channel (PVC) and a Switched Virtual Channel (SVC). The present invention relates to a computer-readable recording medium for recording a program for realizing the above method, and particularly for realizing subscriber or network matching function in a frame relay network, a frame relay permanent virtual connection (PVC) and an exchangeable virtual connection (SVC). The present invention relates to a method for generating a message and managing message parameter information required for implementing an SVC proxy function and a computer-readable recording medium for recording a program for realizing the method.

Due to the advantages of providing high-speed data communication services at low cost, network operators in the proliferation frame relay communication market have provided only PVC services to date. However, research has shown that the provision of SVC services is inevitable and will be supported by network operators in the near future to save network resources, improve performance and introduce new application services. Therefore, in the transition process from PVC to SVC, in addition to supporting the SVC service in the network, a method for accommodating the existing frame relay PVC terminal in the frame relay SVC network will emerge as an important issue.

However, in the conventional frame relay network, there is a problem that SVC message generation and message parameter management methods, which are essential when implementing a proxy function for interworking PVC and SVC, are not provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and implements a management table that mutually maps related information for interworking between a permanent virtual connection (PVC) function and an exchangeable virtual connection (SVC) function. It is an object of the present invention to provide a method of generating a message and managing message parameter information in a virtual connection (SVC) proxy and a computer-readable recording medium recording a program for realizing the method. .

1 is an exemplary configuration diagram of a frame relay network to which the present invention is applied.

2 is an exemplary view of a protocol stack in a frame relay network to which the present invention is applied.

3 is an exemplary view illustrating a call setup procedure in a frame relay network to which the present invention is applied.

4 is an exemplary view illustrating an interworking procedure for interworking with SVC and PVC in a frame relay network having an SVC proxy to which the present invention is applied.

5 is a diagram illustrating an embodiment of a PVC state information management table managed in an SVC proxy according to the present invention.

6 is a diagram illustrating an embodiment of an SVC message related information management table managed in an SVC proxy according to the present invention.

FIG. 7 illustrates an embodiment of an SVC proxy for link state interworking and SVC message input / generation processing according to the present invention. FIG.

8 is a flow diagram of an embodiment of a PVC status management signal processing procedure according to the present invention.

9 is a flowchart illustrating an embodiment of an SVC input call signal processing procedure according to the present invention;

10 is a flowchart illustrating an embodiment of an SVC output call signal processing procedure according to the present invention.

* Explanation of symbols for the main parts of the drawings

11: Frame relay PVC terminal 12: SVC proxy

13 frame relay SVC network 14: frame relay SVC terminal device

In order to achieve the above object, the present invention provides a switchable virtual connection (SVC) for interworking a permanent virtual channel (PVC) and a switchable virtual channel (SVC) applied to a frame relay communication system. A method for generating a message and managing message parameter information in a proxy, the method comprising: managing a persistent virtual connection state and information related to connection with a subscriber managed by the switchable virtual proxy on a subscriber basis to the switchable virtual proxy; Configuring a first management table for the first step; A second step of configuring a second management table for managing a call connection state and a switchable virtual connection message related parameter information managed by the proxy in unit of a call number in the switchable virtual connection proxy; A third step of receiving and analyzing a message of a permanent virtual connection in the switchable virtual connection proxy, changing information of a corresponding subscriber in the first management table, and performing response processing according to the type of the received message; A fourth step of receiving a signaling message input from the switchable virtual proxy and storing / modifying the information and the call state information, etc. contained in the message in the second management table according to a call number; And a fifth step of generating and transmitting a signaling message output from the switchable virtual connection proxy by referring to the second management table and managing a call state according to the second management table.

The present invention also provides a frame relay communication system having a high-capacity processor for managing persistent virtual connection status and information related to connection with subscribers, which are managed by the switchable virtual proxy on a subscriber basis. A first function of constructing a first management table; A second function of configuring a second management table in the switchable virtual proxy for managing call connection status and switchable virtual connection message related parameter information managed by the proxy on a call number basis; A third function of receiving and analyzing a message of a permanent virtual connection in the switchable virtual proxy, changing information of a corresponding subscriber of the first management table, and performing response processing according to the type of the received message; A fourth function of receiving a signal message input from the switchable virtual connection proxy and storing / modifying the information and the call status information, etc. contained in the message in the second management table according to a call number; And a program for realizing a fifth function of generating and transmitting a signaling message output from the switchable virtual proxy by referring to the second management table and managing a call state according to the second management table. It provides a recording medium that can be read by.

In the present invention, the SVC message generation method and the information used to generate the message required in the SVC proxy function for accommodating the existing frame relay PVC terminal in the frame relay SVC network in the natural introduction process from the frame relay PVC to SVC Suggest ways to manage them.

In the present invention, the ITU-T Recommendation "Q.933 Annex A" function, which is a PVC state management function, and the ITU-T Recommendation "Q.933" function, which is an SVC signal processing function, must be independently performed in the SVC proxy. . In the present invention, state information of related connections between these two functions is mapped to each other. To do this, you must be able to send and receive PVC status management messages from "Q.933 Annex A", as well as generate and send "Q.933" SVC signaling messages, receive SVC signaling messages to The ability to change information should be provided. In other words, a function of storing, changing, or supplementing parameter information in a message for generating a signaling message should be performed.

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.

First, a configuration example of a frame relay network to which the present invention is applied will be described with reference to FIG. 1, an SVC proxy function will be described with reference to FIG. 2, and a frame relay SVC signaling procedure and a PVC state management procedure will be described with reference to FIG. 3. This is explained in In addition, an interworking procedure for interworking SVCs and PVCs performed in an SVC proxy will be briefly described with reference to FIG. 4.

In order to explain the function of the present invention, the structure of the information management table configured in the SVC proxy and the information elements managed in the table will be described with reference to FIG. 5 and the call-related connections using the information management table described with reference to FIG. An SVC message generation procedure for linking a state and PVC / SVC will be described with reference to FIG. 6, and FIG. 7 will be described for a link state linkage and SVC message input / generation process.

8 shows a PVC state management signal processing procedure, FIG. 9 illustrates an SVC input call signal processing procedure, and FIG. 10 illustrates an SVC output call signal processing procedure.

1 is an exemplary configuration diagram of a frame relay network to which the present invention is applied.

By connecting the frame relay PVC terminal device 11 to the frame relay SVC network 13, the SVC proxy 12 is used for data transmission and reception with the frame relay SVC terminal device 14, and the present invention uses the SVC proxy 12 at this time. It relates to a method for interworking).

2 is an exemplary diagram of a protocol stack in a frame relay network to which the present invention is applied.

2 shows a protocol stack in a frame relay network. As shown in FIG. 2, in the SVC proxy 12, a layer 3 function is independently performed by the PVC state management function "Q.933 Annex A" function and the SVC signal processing function "Q.933" function. The state information of the connections is mapped to each other to achieve interworking between the PVC and the SVC. Layer 2 functionality is performed by the Q.922 core functionality.

The function for PVC maintenance of Frame Relay (FR) recommended in "Q.933 Annex A" uses Status Inquiry (SE) and Status Message (S). In the case of a User Network Interface (UNI), when a periodic status request (SE) message is transmitted from the FR terminal equipment (TE) to the network side, the network transmits a status (S) message to the FR TE side in response. The content of the status (S) message includes the status or Link Integrity Verification (LIV), single PVC asynchronous status, etc. for all PVCs on the bearer channel. Unidirectional mode is defined as the main mode of UNI, and bidirectional mode is defined as selection mode.

In the case of Network Network Interface (NNI), bidirectional mode is defined as the main mode, and event-driven mode is defined as the selection mode. In particular, event-driven mode is a status message. Only used.

In the case of SVC, the Frame Relay Forum (FRF) recommends the messages (CALL PROCEEDING, CONNECT, SETUP, DISCONNECT, RELEASE, RELEASE COMPLETE, etc.) and the procedures used to set up and release the call. Is divided into three processes: call setup, data communication, and call release.

3 is an exemplary view illustrating a call setup procedure in a frame relay network to which the present invention is applied.

3 shows a procedure for establishing and releasing a FR call. When a call request is made from the originating FR TE 21 to the network 22 (Call request) (201), the network 22 notifies the called party FR TE 23 of the requested call request (202). When the called party FR TE 23 decides whether to accept the request and notifies the network 22 of the call acceptance (203), the network 22 transmits the requested SVC through the network switch. The call is established and the call is notified to the calling party. When the connection is established between the calling party and the called party in the network, the two sides communicate with each other (205).

When the mutual data communication is terminated, when the calling party (or the called party) wants to terminate the communication, it releases the request to the network (206). The network announces the release request to the called party (or originating party) (Release indication 207), waits for a response (Release confirmation) and when the response comes (208), the connection is terminated (209).

4 is an exemplary view illustrating an interworking procedure for interworking SVC and PVC in a frame relay network having an SVC proxy to which the present invention is applied.

4 shows a signaling procedure between a FR SVC (calling) terminal and a FR PVC (calling) terminal. When the call setup request is made from the FR SVC terminal 301 to the FR SVC network side 302 (303), the network side transmits the call setup request message to the SVC proxy side 304 (305). The SVC proxy then requests 306 status information about the connection to the FR PVC terminal side to determine whether to approve the call setup request (306), and if the response is "active" (307), A call acceptance for the call is sent to the network side (308). The network transmits a call connection (309) to the FR SVC terminal side (309), and establishes the end-to-end connection to enable communication between the FR PVC terminal and the FR SVC terminal (310). Of course, this is a case where the connection is established by sending a status request (SE) and the status (S) in response to each other between the FR PVC terminal and the SVC proxy.

If the FR SVC terminal side sends a Release Request message to the network side to stop end-to-end communication (311), the network side sends the message (Release request) to the SVC proxy (312), the SVC proxy The proxy transmits a Release confirmation message to the network side in response (313). At this time, when the FR PVC terminal sends a status request (SE) for the connection (314), the SVC proxy responds with the connection as "inactive" (315), end-to-end connection Is fully recovered.

5 is a diagram illustrating an embodiment of a PVC state information management table managed in an SVC proxy according to the present invention.

FIG. 5 shows a configuration of an information management table related to PVC status and connection with subscribers managed in an SVC proxy. Since the Q.933 Annex A processing procedure for PVC status management is performed on a channel basis, that is, on a subscriber basis, the management table should be configured for each subscriber (501). 506, the subscriber's access band 507 and information 508 necessary for the " Q.933 Annex A " processing procedure, and so forth. Information 508 necessary for the " Q.933 Annex A " processing procedure is composed of timers 391, 392, counters 391, 392, 393, sequence numbers, etc. (509). The number of subscribers varies depending on the type of physical link being accommodated, the number of connections 502 belonging to that subscriber also varies, and the maximum is generally determined by system specifications. Information related to each connection belonging to a subscriber includes DLCI (Data Link Connection Identifier, 505) for identifying a connection within the subscriber, a call number 503 for finding an interworking call on the SVC side, and The PVC's state (new, deleted, active, inactive) 504 or the like.

FIG. 6 is a diagram for explaining an SVC message related information management table managed in an SVC proxy according to the present invention. FIG.

6 shows a configuration of a call connection state and SVC message related parameter information management table managed in an SVC proxy. In addition to the state information mapping function between the PVC and the SVC, a function to be implemented for the PVC / SVC interworking is the generation of each SVC signaling message for related calls or connections. To this end, the SVC proxy should have a function of storing and changing or supplementing the table information by placing a parameter information table in a message for generating a signal message, that is, a signaling message. For example, during an SVC signaling message, the parameters in the SETUP message consist of primary or optional parameters such as protocol identifier, call reference information, message type, bearer capability, channel identifier, DLCI, etc., which must be managed by the relevant connections. will be.

To this end, as shown in FIG. 6, in order to distinguish a call to be managed, a table 601 must be configured for each call number. For each call number, a call number 602, call setup progress and connection state 502, subscriber number 603 and DLCI 604 necessary for interworking with the PVC side are managed. Also, bearer capability information 605 indicating a layer 2 function, channel identifier (ID: 606), link layer key parameter 607, and the like, as parameter information required to generate various SVC signal messages mentioned above. do. In addition, a lot of parameter information must be constructed for each call number.

7 is a diagram illustrating an embodiment of an SVC proxy for link state interworking and SVC message input / generation processing according to the present invention.

FIG. 7 illustrates a procedure of mapping state information and analyzing / generating an SVC signal message using the information management tables described with reference to FIGS. 5 and 6 in an SVC proxy. To this end, the whole function is divided into PVC side and SVC side. The above-described "Q.933 Annex A" function 701 on the PVC side receives a STATUS or STATUS ENQUIRY message for the PVC state management (704), analyzes it, and then, in FIG. The related information, in particular, the PVC state 504, the "Q.933 Annex A" related information 508, etc. are changed in the PVC side information management table 706 described (705). In addition, in order to generate a status S or status request message, the information stored in the information management table 706 is generated and transmitted to the counterpart terminal (704). In this case, the PVC state information referred to in particular should generate a message with reference to the call state 502 information in the SVC management information table 7010. The SVC side processing function is roughly divided into the input call signal processing function 702 and the output call signal processing function 703. In the case of the input call signal processing function, an incoming signal message (eg, SETUP) is received (708), and the information and call state information, etc. contained in the message are stored / changed in the SVC side information management table 7010 according to the call number. (7011). In order to generate the response message (eg ALERTING) to the above input signal message, the SVC-side information management table 7010 is generated again and transmitted to the other party (708), and the call state is changed. In the case of the output call signal processing function 703, an output signal message (eg, SETUP) is generated by referring to the SVC side information management table and then transmitted to the counterpart (709), and the call state is changed. Upon receiving the response message (eg ALERTING) for the above output signal message (709), the information and call status information, etc. contained in the message are stored / changed in the SVC side information management table 7010 according to the call number. (7012).

8 is a flowchart illustrating an embodiment of a PVC state management signal processing procedure according to the present invention.

FIG. 8 shows a PVC status management signal processing and control procedure on the PVC side of FIG. When the PVC status management signal processing function is driven (801), when a status (S) or status request (SE) message is received (802), the message is analyzed to perform appropriate processing according to the type of the message (803). . As a result of analyzing the received message, if it is a status request (SE) message, the control information (status of PVCs, Q.933 Annex A related information) of the relevant subscriber in the information table is changed (804). Referring to the SVC state mapped with the corresponding PVC in the (805), and generates a state (S) message (806). The generated message is sent to the other subscriber (807).

As a result of analyzing the received message, if it is a status (S) message, the control information (status of PVCs, Q.933 Annex A related information) of the relevant subscriber in the information table is changed (808).

9 is a flowchart illustrating an embodiment of an SVC input call signal processing procedure according to the present invention.

9 illustrates an SVC side input call signal processing control procedure in the SVC proxy of FIG. 7. When the SVC input call signal processing function is driven (901), an input call signal message is received (902). The call state associated with the received signal message is determined (903), and each of the corresponding functions to be processed according to the call state is driven to drive the function (904). The corresponding function analyzes the incoming signaling message and assigns the call number accordingly (905). Information is stored or changed in a related table according to the assigned call number (906). Further, in order to generate a response message to be transmitted in response to the received signal message, a reference message related to the call number is generated (907), a response message is generated (908), a response signal message is transmitted to the other party (909), Change the call state (910).

10 is a flowchart illustrating an SVC output call signal processing procedure according to the present invention.

FIG. 10 illustrates an SVC side output call signal processing control procedure of FIG. 7. When the SVC output call signal processing function is driven (1001), the state of the corresponding call related to the signal message is determined (1002), and if idle, the idle call number is allocated to generate an output call signal message (call setup message). (1003). With reference to the information table related to the assigned idle call number (1004), a call setup message is generated (1005), transmitted (1006), and the call status is changed and terminated (1007).

As a result of determining the state of the corresponding call related to the signal message, if the call state is a signal message reception state, the signal message is received (1008), the call state according to the call is determined (1009), and jumps to the start of the processing function. The corresponding processing function is performed (1010). The received signal message is analyzed and the corresponding call number is retrieved (1011), and stored and changed in an information table related to the call number (1012). With reference to the call number related information table (1013), a response message to the received message is generated (1014), transmitted (1015), and the call state is changed and terminated (1016).

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention proposes a signal processing and information management procedure in the SVC proxy, which is essential for implementing the SVC proxy function, thereby providing connection information related to a call required in the SVC proxy and Efficient management of PVC status information has the effect of providing real-time interlocking function for SVC and PVC interconnection.

Claims (7)

Message generation and messages in a switchable virtual connection (SVC) proxy for interworking a permanent virtual connection (PVC) and a switched virtual channel (SVC) applied to a frame relay communication system In the parameter information management method, A first step of configuring a first management table for managing a persistent virtual connection state managed by the switchable virtual proxy and information related to connection with a subscriber in the switchable virtual proxy; A second step of configuring a second management table for managing a call connection state and a switchable virtual connection message related parameter information managed by the proxy in unit of a call number in the switchable virtual connection proxy; A third step of receiving and analyzing a message of a permanent virtual connection in the switchable virtual connection proxy, changing information of a corresponding subscriber in the first management table, and performing response processing according to the type of the received message; A fourth step of receiving a signaling message input from the switchable virtual proxy and storing / modifying the information and the call state information, etc. contained in the message in the second management table according to a call number; And A fifth step of generating and transmitting a signaling message output from the switchable virtual proxy by referring to the second management table and managing a call state in the second management table accordingly; Message generation and message parameter information management method comprising a. The method of claim 1, The first management table, A subscriber information field comprising a subscriber number for distinguishing subscribers, access bands of the subscribers, and information necessary for a permanent virtual connection processing procedure; And DLCI (Data Link Connection Identifier) to distinguish the connection from the information of the subscriber, the call number to find the interlocking call of the switchable virtual connection side and the status information of the permanent virtual connection, each belonging to the subscriber Connection information field of subscriber which constitutes information related to connections of Message generation and message parameter information management method comprising a. The method of claim 1, The second management table, Message generation comprising the configuration of a table including call number information, call status information, subscriber number information, DLCI (DLCI) information, bearer capability information, channel identifier information, and link layer parameter information according to the call number. How to manage message parameter information. The method of claim 1, The third step, A sixth step of the proxy receiving and analyzing a message of a permanent virtual connection; A seventh step of changing information of the subscriber in the first management table if it is a status message as a result of the analysis of the sixth step; And As a result of the analysis of the sixth step, if it is a Status Inquiry message, the information of the subscriber is changed in the first management table, and the status is referred to by referring to the corresponding permanent virtual connection and the state of the switchable virtual connection mapped thereto in the subscriber information. Eighth step of generating and sending a message Message generation and message parameter information management method comprising a. The method of claim 1, The fifth step, Determining a state of a corresponding call related to a signaling message according to driving of the switchable virtual connection output call signal processing function of the proxy; A seventh step of allocating a call number if it is in an idle state, generating and transmitting an output call signal message with reference to the second management table, and changing a call state in the second management table; And As a result of the determination in the sixth step, when the signal message is waiting to be received, the signal message is received, analyzed for the message, the call number is retrieved, the information is stored / changed in the second management table, and the second management table is referred to. Eighth step of generating and transmitting a response signal message and changing the call state Message generation and message parameter information management method comprising a. The method according to any one of claims 1 to 5, The fourth step, Receiving a switchable virtual connection input signal message of the proxy, analyzing the message and assigning a call number; A tenth step of storing / changing information in the second management table according to the assigned call number; An eleventh step of generating and transmitting a response signal message with reference to the second management table; And A twelfth step of changing a call state in the second management table; Message generation and message parameter information management method comprising a. In a frame relay communication system having a large processor, A first function of configuring a first management table for managing a persistent virtual connection state managed by the switchable virtual proxy and information related to connection with a subscriber in a switchable virtual proxy; A second function of configuring a second management table in the switchable virtual proxy for managing call connection status and switchable virtual connection message related parameter information managed by the proxy on a call number basis; A third function of receiving and analyzing a message of a permanent virtual connection in the switchable virtual proxy, changing information of a corresponding subscriber of the first management table, and performing response processing according to the type of the received message; A fourth function of receiving a signal message input from the switchable virtual connection proxy and storing / modifying the information and the call status information, etc. contained in the message in the second management table according to a call number; And A fifth function of generating and transmitting a signaling message output from the switchable virtual proxy by referring to the second management table and managing a call state in the second management table accordingly; A computer-readable recording medium having recorded thereon a program for realizing this.