KR100243687B1 - Switched virtual connection-based internet service - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method for providing an SVC-based Internet service on a frame relay network.

2. The technical gist of the invention to solve

An object of the present invention is to provide a signal virtual connection-based Internet service providing method on a frame relay network for a dial-up PPP user in a frame relay network matching device capable of reducing service delay time.

3. Summary of the Solution of the Invention

The present invention provides a method comprising: a first step of connecting a call; Establishing a PPP link; Establishing a SVC; A fourth step of transmitting an IP datagram; A fifth step of releasing the SVC; A sixth step of releasing the PPP link; And a seventh step of releasing the call.

4. Important uses of the invention

The present invention is used to provide an SVC-based Internet service on a frame relay network using a method of transmitting an IP datagram by adopting an SVC scheme on a connection centered frame relay network.

Description

Method of Providing Signal Virtual Connection Based Internet Service on Frame Relay Network

The present invention relates to a method for providing a switched virtual circuit (SVC) based Internet service on a frame relay network for a dial-up point-to-point protocol (PPP) user, and in particular, a connectionless type input from a plurality of dial-up PPP users. The present invention relates to an SVC-based Internet service providing method on a frame relay network using a method of transmitting an Internet Protocol (IP) datagram using an SVC scheme to a connection centered frame relay network.

Existing Internet service delivers the required IP datagram to the destination through routers and gateways for connection between local area networks (LANs) in order to service information desired by the user. In this case, the routers and gateways used generally accept layer 1 to layer 3 in the Open System Interconnection-7 (OSI-7) hierarchy. Thus, the typical operation procedure performed at one router or gateway to deliver to the destination of the IP datagram to be transmitted is as follows. When an IP datagram is input, an IP header error is checked, and if there is no error, an IP datagram address is extracted from the input IP datagram. Next, find information to route the destination address of the IP datagram extracted earlier from the routing table. If no routing information is found, the default router routing route is determined. Since the network base of the conventional Internet is mostly a LAN, in order to transmit an IP datagram to a next destination (router or host), the hardware address of that destination must be known. This is obtained through an Address Resolution Protocol (ARP) Request and an Address Resolution Protocol Response (ARP Reply) procedure. When this operation obtains the hardware address of the next destination, it adds its hardware address and the destination hardware address to the header of the IP datagram, calculates a cyclic redundancy check (CRC), adds it to create a frame, Broadcast to

However, in the conventional method as described above, not only does a complicated process in one router for IP datagram transmission, but also in the Internet service, which is required to go through multiple routers for IP datagram delivery to a destination, There was a problem that the delay time is long. In addition, at the time when Internet services are becoming multimedia, there is still a problem that the service delay caused by such heavy protocol processing causes a lot of complaints to users.

Accordingly, the present invention has been made to solve the above-described problems, the SVC-based network on the frame relay network with a higher transmission speed than the conventional LAN, and low latency in the network due to the light protocol An object of the present invention is to provide a signal virtual connection-based Internet service providing method on a frame relay network for a dial-up PPP user in a frame relay network matching device by providing an Internet service.

1 is an exemplary diagram of a service network of a mass communication processing system to which the present invention is applied;

2 is an exemplary diagram of a frame relay network matching device to which the present invention is applied.

3 is a flowchart illustrating a process of performing a call connection method for providing an SVC-based Internet service on a frame relay network for a dial-up point-to-point protocol (PPP) user according to the present invention.

4 is a flowchart illustrating an exemplary process of performing a PPP link establishment method for providing an SVC-based Internet service on a frame relay network for a dial-up PPP user according to the present invention.

FIG. 5 is a flowchart illustrating a SVC call establishment method of a service processing board according to reception of an IP datagram from a user in order to provide an SVC-based Internet service on a frame relay network for a dial-up PPP user according to the present invention. Example flow chart.

FIG. 6 is a flowchart illustrating an execution process of an SVC setting method in a frame relay network matching unit according to the present invention; FIG.

7 is a flowchart illustrating an embodiment of a method of transmitting an IP datagram in a service processing board according to the present invention;

8 is a flowchart illustrating an exemplary process of transmitting an IP datagram to a frame relay network according to the present invention.

9 is a flowchart illustrating an embodiment of a method of transmitting an IP datagram to a telephone network according to the present invention.

10 is a flowchart illustrating an embodiment of a method of releasing an SVC in a service processing board according to the present invention;

11 is a flowchart illustrating a process of releasing an SVC in a frame relay network matching board according to the present invention.

12 is a flowchart illustrating a method of performing a PPP link release method between a user and a frame relay network matching device.

13 is a flowchart illustrating an embodiment of a call release method according to the present invention;

Explanation of symbols on the main parts of the drawings

110: mass communication processing system 111: subscriber network matching device

112: high speed switching system 113: frame relay network matching device

120: telephone network 130: terminal unit

140: frame relay network

In order to achieve the above object, the present invention provides a method for providing a switched virtual connection (SVC) based Internet service on a frame relay network for a dial-up Point-to-Point Protocol (PPP) user, wherein the signal is provided. A first step of connecting a call for providing a virtual connection-based Internet service; A second step of establishing a PPP link between the user and the frame relay network matching device; Receiving a IP datagram from the user and establishing a signaling virtual connection call; A fourth step of establishing a signal virtual connection; A fifth step of transmitting an IP datagram in the service processing board; A sixth step of transmitting an IP datagram to the frame relay network; A seventh step of transmitting the IP datagram to the telephone network; An eighth step of releasing a signal virtual connection in the service processing board; Ninth step of releasing signal virtual connection in frame relay network matching board; A tenth step of releasing the PPP link between the user and the frame relay network matching device; And an eleventh step of releasing the call.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 1 to 4.

1 is an exemplary diagram of a service network of a mass communication processing system that provides an SVC-based Internet service on a frame relay network to which the present invention is applied.

As shown in FIG. 1, the mass communication processing system 110 to which the present invention is applied includes a subscriber network matching device 111, a high speed switching system 112, and a frame relay network matching device 113. .

The detailed configuration and operation of the mass communication processing system having the structure as described above are as follows.

The mass communication processing system 110 is connected to the terminal unit 130 of the dial-up PPP user through the telephone 120 network, and is connected to a content provider (CP) 150 through the frame relay network 140. Are connected to the LAN networks 160 to which LANs are connected. The mass communication processing system 110 is a content provider (CP) 150 to the dial-up PPP user terminal unit 130 connected to the telephone network 120 and the LAN network 160 via the frame relay network 140. By connecting them, the Internet service base on the frame relay network 140 is provided.

The subscriber network matching device 111 performs a call connection function, a transparent data transmission and reception function, and a call release function for a dial-up PPP user, and the frame relay network matching device 113 transmits and receives a PPP matching function and an IP datagram. Function, frame relay network matching function. The fast switching system 112 provides a high speed communication function between the subscriber network matching device 111 and the frame relay network matching device 113.

2 is an exemplary diagram of a frame relay network matching device to which the present invention is applied.

As shown in FIG. 2, the frame relay network matching device 140 to which the present invention is applied includes a service processing board 210 and a frame relay network matching board 230.

The configuration of the frame relay network matching device as described above is as follows.

The service processing board 210 may include a fast switching system matching block 211, a channel controller 212, a PPP frame processor 213, a link layer processor 214, and a link control protocol (LCP) processor 215. Internet Protocol Control Protocol (IPCP) processing unit 216, PPP timer management unit 217, IP processing unit 218 for the frame, the first dual port read access memory (DPRAM) communication protocol processing unit 219 , SVC call processing unit 220, call management unit 221 and call monitoring unit 222 is provided.

The frame relay network matching board 230 includes a second DPRAM communication protocol processor 231, a congestion controller 232, a data transceiver 233, a frame relay interface 234, and a message processor 235.

3 is a flowchart illustrating an exemplary process of performing a call connection method for providing an SVC-based Internet service on a frame relay network for a dial-up PPP user according to the present invention.

As shown in FIG. 3, when the user accesses the mass communication processing system 110, the subscriber network matching device 111 transmits a call connection request message to the frame relay network matching device 113 (301). The frame relay matching device 113 receiving the call connection request message checks and determines the call request message protocol error (302). If it is determined that there is no error, the frame relay matching device 113 stores information of the corresponding call (303). Used for service control. When the information storage is completed, the call connection completion message is transmitted to the subscriber network matching device 111 to notify that call setup is completed (304). On the other hand, if it is determined that an error has occurred in the call request message protocol in the determination process 302, no action is taken, thereby causing the subscriber network matching device 111 to automatically release the call by time out. Do it. The operation procedure is performed by the channel controller 212 through the fast switching system matching unit 211.

4 is a flowchart illustrating an exemplary process of performing a PPP link establishment method for providing an SVC-based Internet service on a frame relay network for a dial-up PPP user according to the present invention.

As shown in FIG. 4, when call setup is completed through the process of FIG. 3, an internal signal indicates that the physical link is in an UP state. After detecting the signal, the LCP processing unit 215 transmits the LCP Configure-Request message to the user through the link layer processing unit 214, the PPP frame processing unit 213, and the fast switching system matching unit 211 (step 401). . Subsequently, LCP negotiation is performed in the LCP processing unit 215 of the frame relay with the user (402), and the LCP processing unit 215 finally receives an LCP Configure-Ack message from the user (403), and enters the IPCP negotiation step. (403). In this case, the frame reception from the user is performed by stepping through the fast switching system matching unit 211, the channel control unit 212, the PPP frame processing unit 213, and finally the link layer processing unit 214 unlike the transmission. In the IPCP negotiation step, the IPCP processing unit 216 of the frame relay network matching device 113 increases the efficiency of port management by allocating an IP address to the user, the user port number being the end value of the IP address (404). Subsequently, when the IPCP Configure-Ack message is received from the user (405), the PPP link between the user and the frame relay network matching device 113 is successfully established.

FIG. 5 is a flowchart illustrating a SVC call establishment method of a service processing board according to reception of an IP datagram from a user in order to provide an SVC-based Internet service on a frame relay network for a dial-up PPP user according to the present invention. Example flow chart. As shown in FIG. 5, when an IP datagram is input from a user (501), the IP processing unit 218 for the IP and the frame determines whether there is an error in the IP header (502). If it is determined that there is no error in the IP header, it is determined whether to extract the IP destination address and route the IP datagram to the telephone network, the local or the frame relay network (503). If it is determined that the IP datagram needs to pass through the frame relay network, it is determined by checking whether there is a call already set to the corresponding address (504). If there is no call already established as a result of the determination, the IP processor 218 for the IP and frame relay requests the SVC call processor 220 to generate and transmit an SVC setup request message (505). Subsequently, the SVC call processor 220 generates an SVC setup request message and transmits the generated SVC request message to the frame relay network matching board 230 and waits for a call setup confirmation message to be received (506). When the call setup confirmation message is received from the frame relay network matching board 230, the SVC call processing unit 220 stores the received SVC information (508), so that it can be used for the IP datagram transmission step and the SVC release step. If the SVC call processing unit 220 receives the call release confirmation message instead of the call establishment confirmation message in the determination process 507, the SVC call processing unit 220 transmits an Internet Control Message Protocol (ICMP) message to the user. Inform 509 that the service to the requested IP destination address is unavailable.

On the other hand, it is determined in step 502 that an error occurs in the IP header, and discards the received IP datagram (510).

6 is a flowchart illustrating an execution process of an SVC setting method in a frame relay network matching unit according to the present invention.

As shown in FIG. 6, the SVC call setup request message is received from the service processing board 210 (601), and the message processing unit 235 generates an SVC setup (Q.933 SETUP) message to generate a data transmission / reception unit 233. And after transmitting to the frame relay network through the frame relay interface 234 (602), it is determined whether an SVC connection (Q.933 CONNECT) message has been received (603). If it is determined that the SVC connection (Q.933 CONNECT) message is received from the frame relay network, after storing the SVC call information including the DLCI (604), and transmits the SVC call setup complete message to the service processing board 210 (605). On the other hand, if it is determined in step 603 that no SVC connection (Q.933 CONNECT) message is received from the frame relay network, a call release confirmation message is transmitted to the service processing board 210 (606), and the SVC setup fails. Inform.

Table 1 below shows the structure of the SVC information managed by the service processing board according to the present invention.

IP Addr FR Addr FR Addr Len DLCI Call ref Port

As shown in [Table 1], the information of each SVC is an IP Addr field indicating an IP address, and the FR Addr field indicating a frame relay address corresponding to the IP address is a frame relay address type of X.121 or E.164. It includes a FR Addr Type indicating a FR, a FR Addr Len field indicating a real length of a frame relay address, a DLCI field, a Call Ref field indicating a Call Reference value, and finally a Port field for transmitting a frame. Meanwhile, the IP Addr, FR Addr, FR Addr Type, and FR Addr Len fields receive input from a local MMC or are downloaded when the system is booted from a local management device of the mass communication processing system 110.

7 is a flowchart illustrating an embodiment of a method of transmitting an IP datagram in a service processing board according to the present invention.

As shown in FIG. 7, when receiving the IP datagram from the subscriber network matching device 111 (701), the IP processing unit 218 for the IP and the frame indicates that the destination of the IP datagram is local, telephone network or frame. It is determined whether the relay network (702). In response to the determination that the destination requires a route to the frame relay network, the DLCI corresponding to the destination address of the IP datagram is extracted from the SVC information management table of [Table 1] (703), and the received IP datagram After adding the DLCI header to the frame (704), the data transmission message is transmitted to the frame relay network matching board (230) (705). On the other hand, if it is determined in step 702 that the destination is not the frame relay network, it is determined whether the destination of the IP datagram is a telephone network (706), and if it is determined that the destination is a telephone network, the IP datagram is relayed to the telephone network. Relaying (707). If it is determined in the determination process 706 that the telephone network is not, local processing is performed (708).

8 is a flowchart illustrating an exemplary process of transmitting an IP datagram to a frame relay network according to the present invention.

As shown in FIG. 8, when the IP datagram including the header is added to the IP datagram to transmit the DLCI value extracted through the process of FIG. 7 (801), the frame relay network matching board 230 first receives the DLCI field. Is stored in the upper 6 bits and the lower 4 bits according to the frame relay protocol (802). Subsequently, after the frame is transmitted and the DE bit is set through the congestion control unit 232, it is determined whether to transmit or discard the frame (803).

If it is determined that the DE bit setting is determined, the DE bit is set to 1 (804). If the transmission decision is made in the panda process 804, after adding a flag and an FCS (805), the frame relay The data is transmitted to the interface unit 234 (806). When the frame discard decision is made in step 803, the IP datagram to which the DLCI header received from the service processing board 210 is added is discarded (807).

9 is a flowchart illustrating an embodiment of a method of transmitting an IP datagram to a telephone network according to the present invention.

As shown in FIG. 9, when the frame relay network matching board 230 receives the frame relay frame including the IP datagram from the frame relay network 140 (901), first, flag removal and FCS checking are performed. In operation 902, the processor determines whether the frame is valid. If it is determined that the frame is valid, the DLCI value is modified according to the protocol with the service processing board 210 and then transmitted to the service processing board 210 (903). The service processing board 210 receiving the frame from the frame relay network matching board 230 removes the DLCI added as a header to the IP datagram (804) and examines the IP header to determine whether an error has occurred (905). ). If no error occurs in the IP header as a result of the determination, the destination address is extracted from the IP datagram (906). Extract the user port number to which the IP datagram should be transmitted from the extracted IP destination address (907), generate a PPP frame containing the IP datagram to be transmitted (908), and then transmit the PPP frame to the extracted port. (909). On the other hand, if the intra frame FCS error received from the frame relay network is detected in the determination process 902, the frame is discarded (910). If an error occurs in the header of the IP datagram in the determination process 905, the corresponding IP datagram is discarded (911).

10 is a flowchart illustrating an embodiment of a method of releasing an SVC in a service processing board according to the present invention.

As shown in FIG. 10, the call monitoring unit 222 determines whether there is traffic for each SVC call during the defined time TIME_OUT (1001), and as a result of the determination, the traffic input for the predetermined time TIME_OUT is determined. For the missing call, the SVC call processing unit 220 requests the release of the SVC. Subsequently, the SVC call processing unit 220 generates an SVC call release message and transmits the generated SVC call release message to the frame relay network matching board 230 (1002), and waits for receiving the SVC call release completion message from the frame relay network matching board 230. . When the SVC call processing unit 220 receives the SVC call completion message from the frame relay network matching board 230 (1003), it initializes the DLCI, Call Ref and Port fields from the SVC call management information table (1004).

11 is a flowchart illustrating an embodiment of a method of releasing an SVC in a frame relay network matching board according to the present invention.

As shown in FIG. 11, when the message processing unit 235 receives the SVC call release request message from the service processing board 210 (1101), it generates a SVC release (Q.933 RELEASE) message and transmits it to the frame relay network. After 1102, it waits to receive a message release completion (Q.933 RELEASE_COMPLETE) message. When the SVC release completion (RELEASE_COMPLETE) message is received from the network (1103), the relevant SVC call information is released and the SVC call release completion message is transmitted to the service processing board 210 (1105).

12 is a flowchart illustrating a process of performing a PPP link release method between a user and a frame relay network matching device.

As shown in Fig. 12, the release of the PPP link between the user and the frame relay network matching device 113 occurs when the user releases the telephone connection inherent in the PPP software. Accordingly, the IPCP processing unit 216 of the frame relay network matching device 113 receives an IPCP Terminate-Request message from the user (1201), and transmits an IPCP Terminate-Ack message to the user in response (1202). The user receiving the IPCP Terminate-Ack message sends the LCP Terminate-Request, and also receives the LCP Terminate-Request message (1203), the LCP processing unit 215 of the frame relay network matching device 140 is LCP Terminate-Ack Send (1204). Thus, the PPP link between the user and the frame relay network matching device 140 is released (1205).

13 is a flowchart illustrating an embodiment of a call release method according to the present invention.

As shown in Fig. 13, the modem is disconnected immediately after the PPP link is released due to the user's disconnection. Upon detecting that the modem is disconnected, the subscriber network matching device 111 transmits a call release request message to the frame relay network matching device 113. When the channel controller 212 of the service processing board 210 receives the call release request message (1301), the call release request protocol error is checked to determine the error (1302). If it is determined that there is no error, the call release confirmation message is transmitted to the subscriber network matching device 111 (1303). Subsequently, all system resources occupied by the call are released (1304). On the other hand, if a call release request protocol error is detected in the determination process 1302, the call release confirmation message is not transmitted and the system resource of the call is immediately released. Thus, the Internet service processing of the frame relay matching device for the user is terminated.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, in the frame relay network matching device of the present invention, a method of providing a virtual connection-based Internet service on a frame relay network for a dial-up PPP user includes a heavy protocol stack, a routing scheme, and a network of an existing Internet service. In order to solve the problem of long service delay caused by factors such as the limitation of transmission speed, the user has to provide the Internet service on the SVC based frame relay network which has the advantage of light protocol stack and faster transmission speed and economy. In addition to faster Internet services, services that are becoming multimedia have the effect that users can use without inconvenience.

In addition, since SVC-based Internet service transmits data by setting up a call only when there is traffic, it has the advantage of being cheaper than Fixed Virtual Coupling (PVC) -based Internet service. It is advantageous for small contents providers (CPs) with a TCP / IP protocol stack. In the case of Internet service providers, it is possible to obtain economics by properly operating PVC and SVC.

Claims (12)

A method of providing a switched virtual connection (SVC) based Internet service on a frame relay network for a dial-up point-to-point protocol (PPP) user, A first step of connecting a call for providing the signal virtual connection-based Internet service; A second step of establishing a PPP link between the user and the frame relay network matching device; Receiving a IP datagram from the user and establishing a signaling virtual connection call; A fourth step of establishing a signal virtual connection; A fifth step of transmitting an IP datagram in the service processing board; A sixth step of transmitting an IP datagram to the frame relay network; A seventh step of transmitting the IP datagram to the telephone network; An eighth step of releasing a signal virtual connection in the service processing board; Ninth step of releasing signal virtual connection in frame relay network matching board; A tenth step of releasing the PPP link between the user and the frame relay network matching device; And Eleventh step to release a call Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The first step is, A twelfth step of transmitting the call connection request message; A thirteenth step of determining the error of a call request message protocol by receiving the call connection request message; A fourteenth step of storing information of the corresponding call or automatically releasing the call according to the determination result of the nineteenth step; And A fifteenth step of notifying that call setup is completed by sending a call connection complete message; Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The second step, A twelfth step of sending an LCP Configure-Request message to the user; A thirteenth step in which LCP negotiation is performed between the user and the frame relay; A fourteenth step of entering an IPCP negotiation step after receiving an LCP Configure-Ack message; A fifteenth step of allocating an IP address to the user, the user port number being the end value of the IP address in the IPCP negotiation step; And The sixteenth step of establishing a PPP link by receiving an IPCP Configure-Ack message from a consumer Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The third step, A twelfth step of receiving an IP datagram from the user and determining whether there is an error in the IP header; According to the determination result of the twelfth step, it is determined whether to discard the IP datagram or extract the IP destination address to route the IP datagram to a telephone network, a local or a frame relay network, and A thirteenth step of determining whether a set call exists; In response to a determination result of the thirteenth step, requesting transmission of the message for requesting the virtual connection setting request; and generating and transmitting the signal virtual connection establishment request message; Determining whether a call establishment confirmation message has been received; And A sixteenth step of storing the received signal virtual connection information or transmitting the ICMP message to the user according to the determination result of the fifteenth step Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The fourth step, A twelfth step of receiving the signal virtual connection call establishment request message, generating and transmitting a virtual signal connection establishment message; A thirteenth step of determining whether the signal virtual connection message has been received; And According to the determination result of the thirteenth step, after the signal virtual connection call information is stored, the signal virtual connection call setup complete message is transmitted or the call release confirmation message is transmitted to notify the signal virtual connection setup failure. Fourteenth step Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The fifth step, A twelfth step of receiving the IP datagram and determining whether the destination of the IP datagram is a local, telephone network or frame relay network; A thirteenth step of extracting a DLCI corresponding to a destination address of the IP datagram according to the determination result of the twelfth step, adding a DLCI header to the received IP datagram, and transmitting the data using a data transmission message; ; A fourteenth step of determining whether a destination of the IP datagram is a telephone network according to the determination result of the twelfth step; And A fifteenth step of relaying an IP datagram to the telephone network or performing local processing according to the determination result of the fourteenth step Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The sixth step; A twelfth step of adding a header to an IP datagram to which the extracted DLCI value is to be transmitted; A thirteenth step of receiving the IP datagram to which the DLCI has been added, and storing the DLCI field into an upper bit of a source and a lower bit of a source according to a frame relay protocol; A fourteenth step of determining whether to transmit a frame, to transmit or discard the bit; And A fifteenth step of setting the bit to 1 or discarding the IP datagram to which the DLCI header is added according to the determination result of the fourteenth step Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The seventh step, Receiving a frame relay frame including an IP datagram, and determining whether the frame is a valid frame; A thirteenth step according to the determination result of the twelfth step, after modifying the DLCI value according to a protocol, transmitting the DLCI, removing the DLCI added as a header to the IP datagram, or discarding the frame; A fourteenth step of determining whether an error has occurred by examining the IP header; A fifteenth step of extracting a destination address from the IP datagram or discarding the corresponding IP datagram according to the determination result of the fourteenth step; And Extracting a user port number to which the IP datagram is to be transmitted from the extracted IP destination address, generating a PPP frame including the IP datagram to be transmitted, and then transmitting the PPP frame to the extracted port; Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The eighth step, A twelfth step of determining whether there was traffic for each said signaling virtual connection call for a defined time; A thirteenth step for requesting the signal virtual connection release and generating and transmitting the signal virtual connection call release message for the call with no traffic input for the predetermined time according to the determination result of the twelfth step; And Fourteenth step of initializing the signal virtual connection information Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The ninth step, Receiving a signal virtual connection call release request message and generating and transmitting the signal virtual connection release message; And After the signal virtual connection is released, a thirteenth step of receiving the signal virtual connection release completion message, releasing the related signal virtual connection call information, and transmitting the signal virtual connection call release complete message; Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The tenth step is A twelfth step of receiving an IPCP Terminate-Request message from a user and transmitting an IPCP Terminate-Ack message; A thirteenth step of receiving the IPCP Terminate-Ack message, sending an LCP Terminate-Request, and transmitting the LCP Terminate-Ack message; And A fourteenth step of releasing the PPP link between the user and the frame relay network matching device; Method of providing a signal virtual connection based internet service on a frame relay network including a. The method of claim 1, The eleventh step, A twelfth step of receiving a call release request message and determining an error of a call release request protocol; And A thirteenth step of transmitting a call release confirmation message or releasing system resources of the call according to the determination result of the twelfth step; Method of providing a signal virtual connection based internet service on a frame relay network including a.

Images