KR100241885B1 - Implementation method of soft pvc of atm network - Google Patents

Abstract

In the method of setting Soft FBC of the AMT switching network, the user terminal of the originating exchange may set a local FBC when the operator terminal of the originating exchange requests and generates a setup message including a user information element and transmits it to the next exchange. In case of receiving setup message, it sets up local FBC, analyzes message and analyzes whether it is the final exchange, then transmits the setup message to the next exchange at the relay exchange, and generates a connection message at the last exchange. In this process, each exchange constituting the switching network establishes a local FBC having user information elements necessary for the soft FBC.

Description

How to Implement Soft 5C on ATM Switching Network

The present invention relates to a PVC implementation method of an ATM switching network, and more particularly, to a soft PVC implementation method.

A general implementation method of Permanent Virtual Channel and Path Connection (PVC) in an ATM network will be described with reference to FIG. 1. In the configuration of FIG. 1, U denotes a user, A, B, and C denote a node switch that constitutes an ATM switching network as an ATM switch, and T1-T3 corresponds to each corresponding node. It means the terminal to be connected. Referring to FIG. 1, when implementing PVC between a U1 subscriber and a U2 subscriber, operators of each node form a PVC using terminals T1-T3 connected to nodes A, B, and C, respectively. However, in such a PVC implementation method, the operator of node A forms a PVC between subscriber U1 and node B using terminal T1, and the operator of node B forms a PVC between node B and node C using terminal T2, The operator of node C should use terminal T3 to form a PVC between node C and subscriber U2. Therefore, the above PVC implementation method requires the operator of each node to register the PVC information in the management system (management system) of the node in order to form a PVC, PVC implementation takes a lot of time and error occurs (error-prone) ) There was a hassle of PVC formation.

2 is a view for explaining a conventional soft PVC forming operation when a request for forming a PVCC or PVPC between the subscribers U1 and U2 occurs. In this case, PVCC means Permanent Virtual Connection Channel and PVPC means Permanent Virtual Path Connection. Thus, PVC refers to the connection of the PVCC and PVPC. In FIG. 2, U denotes a user, A, B, and C denote a node switch that forms an ATM switching network as an ATM switch, and T denotes a terminal connected to a source node. do.

Looking at the conventional soft PVC formation process, in order to implement the PVC between the subscribers U1 and U2, the operator of the node A connected to the subscriber U1 generates a set-up message including the path of each node. Then, the relay node and the target node analyze the setup message to set the PVC, and when the normal PVC setup is possible, the target node generates a connection message and sends it to the source node. The messages are then transmitted over a signaling path. Therefore, when the source node outputs the setup message for forming the PVC and receives the connection message, it means that the soft PVC is normally formed. In FIG. 2, nodes A, B, and C are source nodes, tanning nodes, terminating nodes, and destinating nodes, respectively.

3 is a flowchart illustrating an operation performed by a source node in a conventional soft PVC implementation, and FIG. 4 is a flowchart illustrating an operation performed in a relay node and a destination node in a conventional soft PVC implementation.

3 and 4, when the operator requests soft PVC setting, the source node (which becomes Node A in FIG. 2) detects this in step 311, and in step 313 the PVCC between the subscriber and the next node. Or setting the PVC of the source node to form a PVPC. In step 315, the source node checks whether the PVC setup is normally performed. Otherwise, the source node outputs an error message generated in step 327 and terminates.

However, if the PVC is normally set in step 315, in step 317, a signal processor of the source node generates a SET-UP message to form a PVC, and in step 319 through the outgoing relay line. Print this setup message to the next node. After sending the setup message as described above, the source node waits to receive a CONNECT message or a RELEASE message.

When the soft PVC setup message is received, the node detects it at step 410 and analyzes the received soft PVC setup message at step 412 to check whether the node is the final destination node. In this case, in step 414, the relay node transmits the setup message received to the next node as it is. However, if it is its destination node (in the case of FIG. 2, it becomes node C) in step 412, the node sets the PVC in step 414 and checks whether the PVC is normally set in step 418. In this case, if the PVC is normally set, in step 420, the connection message is output to the corresponding node and terminated. If the PVC is not normally set, in step 422, the release message is output to the corresponding node. In this case, the connection message and the release message are transmitted in the reverse order of the transmitting nodes.

Such soft PVC implementation is described in the ATM Forum. Looking at the conventional soft PVC implementation method performed as described above, it can be seen that the relay node performs a function of transmitting a setup message and a connection message transmitted to a corresponding destination node without performing setup on the PVC. .

In the ATM forum, a called party soft Permanent Virtual Channel Connection or Permanent Virtual Path Connection information element is added to the connection message, and the called party's soft PVCC and PVPC information is added to the setup message. Element and calling party soft PVCC and PVPC information element (calling party soft Permanent Virtual Channel Connection or Permanent Virtual Path Connection information element) is added to implement.

However, when the soft PVC is implemented by accepting only the proposed method in the ATM forum, the following problems may occur.

By first assigning the soft PVC to the source node, the setting for all problems occurring in the middle must be controlled at the source node. In this case, if a problem occurs on the source side, the whole must be released. In other words, if a soft PVC is formed and an abnormal mal-function occurs while servicing a communication function between terminals, the set soft PVC is released. In this case, there is a problem that the entire process of the soft PVC setting process as described above must be performed again.

In addition, the process must be alive in the soft PVC connection process because it is set in a different manner from the PVC implementation method as shown in FIG. This causes a problem in that processing power and waste of resources are caused.

Accordingly, an object of the present invention is to provide a method for implementing soft PVC using user signaling in an ATM network.

Another object of the present invention is to provide a soft PVC implementation method in which each node stores a soft PVC information element and always maintains a connection relationship when implementing soft PVC in an ATM network.

In order to achieve the above object, the method of setting a soft 5C of the ATM switching network of the present invention sets a soft 5C on request of a soft 5C in an operator terminal of an originating exchange and sends a setup message including a user information element. After generating and transmitting to the next exchange, and setting up the local FBC when receiving the setup message, analyzing the message to analyze whether it is the final exchange, and transmitting the setup message to the next exchange when the relay exchange is the final exchange. It consists of a process of generating a connection message at the exchange and transmitting in reverse order, wherein each exchange constituting the exchange network sets a local FB having user information elements necessary for soft FB.

1 is a view for explaining a method of implementing a FC in a conventional ATM switching network

2 is a view for explaining a soft PVC implementation method in a conventional ATM switching network.

FIG. 3 is a flow diagram illustrating the conventional operation of implementing Soft FBC in FIG. 2 and the originating ATM switch of the ATM switching network.

FIG. 4 is a flowchart showing a conventional operation of implementing soft PPs in the relay and destination ATM switches of the ATM switching network as shown in FIG.

5 is a view for explaining the operation of implementing a soft-fig C in the ATM switching network according to an embodiment of the present invention

FIG. 6 is a flow chart illustrating the operation of implementing Soft FBC in FIG. 5 and an originating ATM switch in an ATM switching network.

FIG. 7 is a flowchart illustrating an operation of implementing soft PPs in the relay and destination ATM switches of the ATM switching network as shown in FIG.

In the soft PVC implementation of the ATM network in accordance with an embodiment of the present invention, by using soft PVC user-to-user signaling, it is possible to additionally deliver the values required for setting the PVC, the process is locally You only need to be alive when setting up the soft PVC. By using the same information as soft PVC on the local node, soft PVC can be handled locally. In this case, the content of the message to be transmitted should include information such as an ID indicating the soft PVC and a soft PVC reference value indicating the number of soft PVCs. The messages you use can only be written using SETUP, CONNECT, RELEASE and COMPLETE. Of these, release and complete, in particular, have no information element with a field representing soft PVC, so they must have a soft PVC ID and a soft PVC reference value.

Therefore, when implementing soft PVC according to an embodiment of the present invention, information elements to be added to the setup message first include a called party soft PVPC or PVCC, a calling party soft PVPC and PVCC, a user-to-user information element, user-to-user signaling). Secondly, the information element to be added to the connection message is called party soft PVPC or PVCC, user information element and so on. Third, the information element to be added to the release message is the user information element. Fourth, the information element to be added to the release complete message is a user information element. The called party's soft PVPC or PVCC, and the calling party's soft PVPC or PVCC, follow the ATM forum.

The format of the setup message for the soft PVC is shown in Table 1 below.

Protocol discriminator Call reference Messge type Message length AAL parameters ATM traffic descriptor Broadband bearer capability Called party number called party soft PVPC or PVCC Called party sub-address Calling party number calling party soft PVPC or PVCC Calling party sub-address connection identifier End-to-end transit delay Broadband repeat indicator Narrow-band bearer capability Narrow-band high layer compaibility Broadband repeat indicator Narrow-band low layer compatibility Notification indicator OAM traffic diescriptor progress indicator QOS parameter Broadband sending complete Transit network selection User-to-user signaling

In Table 1, Protocol discriminator, Call reference, Message type, Message Length, ATM traffic descriptor, Broadband bearer capability, Called party number, Called party soft PVPC or PVCC, Designed transit list, User-to-user signaling (mandatory), and the rest are option items.

In Table 1, user-to-user signaling and user-to-user information elements are shown in Table 2 below. In <Table 2>, Flag and Action Indicator are IE intruction fields. In addition, the user information element shown in <Table 2> is composed of 53 octets, and the number in parentheses means an octet number.

0 1 1 1 1 1 1 0 (1) 1Ext Coding standard Flag Reserv-ed ActionIndicator Length of User-user contents (3,4) 1 1 1 0 0 0 0 0soft PVC Identificaiion (5) Soft PVC Reference Value (6) Outgoing B-ISDN Subscriber Number (BSN) number (7-26) Incoming B-ISDN Subscriber Number (BSN) number (26-46) VPI (47,48) VCI (49,50) UDR / BDR (51) Bandwidth (52,53)

In addition, Tables 3 and 4 show the calling party soft PVPC or PVCC information elements and the called party soft PVPC or PVCC information elements, respectively.

1 1 1 0 0 0 1 1 Calling party soft PVPC or PVCCinformation element identifier (1) 1Ext Coding standard IE Instruction Field Length of calling party soft PVPC or PVCC contents (3) Length of calling party soft PVPC or PVCC contents (continued) (4) 1 0 0 0 0 0 0 1 VPI identifier (5) VPI value (5.1) VPI value (5.2) 1 0 0 0 0 0 1 0 VCI identifier (6) VCI value (6.1) VCI value (6.2)

The calling party Soft PVPC or PVCC Informantion element identifier shown in Table 3 is composed of 10 octets, and the number in parentheses means the octet number. In Table 3, the VPI identifier octet group is present only for soft PVCC.

1 1 1 0 0 0 1 1 Called party soft PVPC or PVCCinformation element identifier (1) 1Ext Codingstandard IE Instruction Field Length of called party soft PVPC odr PVCC contents (3) Length of called party soft PVPC or PVCC contents (continued) (4) Selection type (5) 1 0 0 0 0 0 0 1 VPI identifier (6) VPI value (6.1) VPI value (6.2) 1 0 0 0 0 0 1 0 VPI identifier (7) VCI value (7.1) VCI value (7.2)

The called party Soft PVPC or PVCC Informantion element identifier shown in Table 4 is composed of 11 octets, and the number in parentheses means the octet number. In Table 3>, the VPI identifier octet group is not included if the selection type indicates any value. If present, it is ignored. In addition, the VCI identifier octet group is present only in soft PVCC.

Tables 3 and 4 are recommended in PNNI 1.0 of the ATM Forum.

In addition, the exchange receiving the setup message may analyze the corresponding soft PVC and generate the following CONNECT message if the received resource is available, and generate the following RELEASE message if it is unavailable. . The connection message and the release message are recommended in Q.2931, and the contents of the connection message are shown in Table 5 below, and the contents of the release message are shown in Table 6 below. Is the same as

Message type: CONNECTSignificance: GlobalDirection: Both Information element Reference Direction Type Length Protocol discriminatorCall reference Message type Message lengthAAL parameters Broadband low layer information Connection identifier End-to-end transit delayNotification indicator OAM traffic descriptor 4.24.34.44.44.54.54.54.54.54.5 BothBothBothBothBothBothBothBothBothBoth MMMMOOOOOO 14224-214-174-94-104- * 4-6

Message type: RELEASESignificance: GlobalDirection: Both Information element Reference Direction Type Length Protocol discriminatorCall referenceMessage typeMessage lengthCauseNotification indicator 4.24.34.44.44.54.5 BothBothBothBothBothBoth MMMMMO 14226-344- *

5 is a view for explaining the process of operating the soft PVC in accordance with an embodiment of the present invention. In FIG. 5, an example in which soft PVC is set between three exchanges is illustrated. It is assumed that exchange A is an originating exchange, exchange B is a relay exchange, and exchange C is a destination exchange. FIG. 7 is a flowchart illustrating a process of processing a soft PVC at an originating exchange in FIG. 5, and FIG. 8 is a flowchart illustrating a process of processing a soft PVC at a relay and a destination exchange in FIG. 5.

First, referring to FIG. 5, when a soft PVC setting request is generated from the first operator terminal 511, the PVC processing process 512 of the exchanger A receives and stores it in the memory 513 to set a PVC corresponding to its exchanger. A request is made to the relay signaling process 514. The outgoing signaling processing process 514 of the exchange A then makes a request to the incoming signaling processing process 521 of the next exchange B by including the user information elements such as <Table 1> in the <Table 1> and the setup message. Perform signal processing.

The signaling processing processor 521 of the exchanger B then analyzes the setup message and requests processing from its PVC processing process 522 if it is a soft PVC and performs other signal processing. The PVC processing process 522 of the exchanger B then sets the PVC corresponding to its exchanger and stores it in the memory 523 in the memory 523. However, if the resource is not available, the user signaling information element is included in the release message having a content as shown in Table 6 and transmitted to the exchange A, indicating that the PVC cannot be set. In this case, if the soft-PVC is not normally set, it may be a case where the requirements of the bandwidth conditions, QoS conditions, etc. included in the setup message are not satisfied, or the hardware of the exchange is mal-function. Can be. If the resource allocation is successful, the signaling process 524 of the exchange B sends a setup message as shown in Table 1 to the signaling process 531 of the next exchange C.

The signaling processing process 531 of the exchanger C then analyzes the received setup message and, if it is a soft PVC, requests processing from its PVC processing process 532 and processes another signal. At this time, the PVC processing process 532 of the exchanger C determines that the exchange is its destination exchange (the final destination), occupies the PVC resource, stores it in the memory 533, and requests the result of the signaling process 531. At this time, the output message is a connection message, and the message shown in Table 6 is transmitted.

As described above, the portion shown in solid line in FIG. 5 means a route for transmitting a setup message for setting the soft PVC, and the portion indicated by a dotted line indicates the relay switch and the destination side exchange according to the soft PVC setting. Route that sends a response message. At this time, the response message is a connection and release message. If the connection of the soft PVC is established, the connection message is transmitted, and if an error occurs, the release message is transmitted. And the setting result of the soft PVC as described above notifies the operator terminal 511 requesting this.

The messages used for soft PVC configuration as described above contain the user information elements shown in <Table 2>, and the destination and originating B-ISDN Subscriber Number (BSN) numbers and soft PVC reference values are processed even if other signaling is processed. May be used to refer to the only soft PVC.

7 and 8 illustrate the setting process of the soft PVC in terms of the PVC processing process of the calling party, the relay and the called party. Referring to the process of setting the soft PVC with reference to the flow chart of Figure 7 and 8, the calling side exchange performs steps 611-617 and receives the operator's soft PVC setting request, and then sets the PVC to its own exchange. After the normal setting, the setup message is generated and transmitted to the signal processing processor 514, which is transmitted to the next exchange and waits.

When the relay exchange receives the setup message, it sets the PVC to its exchange in step 712, checks whether the PVC is normally set in step 714, and if the PVC is normally set, the set received in the next exchange in steps 716 and 718. Otherwise, the release message is sent to the corresponding exchange that sent the setup message in step 722 and terminates.

When the incoming exchange receives the setup message, it sets PVC to its exchange in step 712 and checks whether PVC is normally set in step 714. If the PVC is normally set, it detects that it is the final destination exchange in step 716. In step 722, the connection message is sent. Otherwise, in step 722, the release message is sent to the corresponding exchange that sent the setup message, and the process ends.

In addition, the relay exchange transmits the connection message or the release message to the previous exchange, and the calling exchange in the standby state notifies and instructs the setting of the soft PVC to the operator terminal upon receiving the connection message, performing steps 619-625. If you receive a release message, print an error message indicating that the soft PVC configuration was not successful and exit.

As described above, the embodiment of the present invention stores all the data necessary for setting the soft PVC in the local exchange, so that the soft PVC can be reset by itself after error recovery when an error occurs. In addition, soft PVC can be implemented without the addition of processes, and the number of processes can be reduced, thereby improving the available resources and the performance of the exchange.

Claims (4)

In the method of setting the Soft 5C of the ATM switching network, Setting a local FBC when a soft terminal is requested by an operator terminal of an originating exchange, generating a setup message including a user information element, and transmitting the set-up message to the next exchange; When receiving the setup message, set up a local FBC, analyze the message and analyze whether it is the final exchange, and transmit the setup message to the next exchange at the relay exchange, and generate a connection message at the time of the final exchange. Consists of transmitting process, And each local exchange of the switching network sets a local FB having user information elements necessary for the soft FB. The user information element of claim 1, wherein the user information element includes a soft 5C ID, a soft 5C reference value, a calling party number, a called party number, a BP, a BC, a UDL / TV, bandwidth information, etc. How to set soft 5C of ATM exchange network. In the method of setting the soft PPC of each ATM switch in the ATM switching network composed of a plurality of ATM switches, When the user terminal requests the soft pigs, the local pigs are set up and the setup message including the user information element is generated and transmitted to the next exchange and waiting, and the message received when the message is received in the waiting step is analyzed. And a step of outputting a soft PBC connection result to the operator terminal when the connection message is output, and outputting an error message to the operation terminal when the release message; Setting a local VB when receiving the setup message for setting the soft PVC, checking whether the local VB is normally set, and transmitting a release message to the exchange at the reverse side when the setting is abnormal; Transmitting a setup message to a next exchange at the intermediate exchange and waiting for the intermediate exchange; and transmitting a message received at the standby step at a reverse exchange, Setting a local VB when receiving the setup message for setting the soft PVC, checking whether the local BV is normally set, and generating and sending the release message to a reverse exchange when the abnormal setting is abnormal; And a step of receiving a call, analyzing the message at the normal setting time, generating a connection message at the final destination exchange, and transmitting the message to the reverse exchange in the reverse direction. 4. The user information element of claim 3, wherein the user information element includes a soft 5C ID, a soft 5C reference value, a calling party number, a called party number, a BP, a BC, a UDI / Video, and bandwidth information. How to set soft 5C of ATM exchange network.

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