KR100342555B1 - Message conversion method network interworking node - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

The present invention relates to a message conversion method of a network interworking node.

I. The technical problem to be solved by the invention

An interworking node performing interworking between an N-ISDN network and a B-ISDN network provides a method for converting between an XUDT message and an LUDT message.

All. Summary of Solution of the Invention

When a message is received from one network, a message receiving unit for searching whether the message is a message to be transmitted to a network using another type of message, and a message to be sent to a network using the other type of message received by the message receiving unit And a message transmitter which transmits the message from the converter to the destination node.

la. Important uses of the invention

The present invention is used in a network interworking node.

Description

Message conversion method of network interworking node {MESSAGE CONVERSION METHOD NETWORK INTERWORKING NODE}

The present invention relates to interworking nodes between networks having different protocols, and more particularly to a method for converting between XUDT messages and LUDT messages in interworking nodes between N-ISDN networks and B-ISDN networks.

1 is a configuration diagram of an N-ISDN NO.7 network entity that processes NO.7 signaling information between a service switching point (SSP, signaling transfer point (STP)) and a database (service control point (SCP)). It is shown. At the subscriber's service request, the exchange systems (SSP, STP) are provided with subscriber information from the database (SCP) required to provide the service. For this purpose, each exchange system (SSP, STP) is a level 4 SCCP (signalling) among the NO.7 functional elements that perform routing to the database (SCP) or other network entities (SSP, STP) in the NO.7 network. The connection control part performs routing using the UDT message or the XUDT message according to the user data size of the message received from the upper application. That is, the SCCP uses a UDT message when the user data size is 255 [bytes] or less. If the user data size is 255 [bytes] or more and 2 [kbytes] or less, the SCCP segments up to 16 messages. The reason for this segmentation is due to the transmission limit of the N-ISDN network.

As the need for a greater amount of signaling information exchange has emerged, B-ISDN technology has emerged. The B-ISDN has a relatively large transmission capacity compared to the existing N-ISDN, and can transmit a LUDT message having a user data size of up to 3952 [bytes].

Since the B-ISDN network and the existing N-ISDN network use different protocols, interworking between the two networks is required, and interworking nodes for such interworking have been developed. In particular, ITU-T mentions that the SCCP performs message conversion between two networks.

Accordingly, when the interworking node transmits a message from an N-ISDN network to a B-ISDN network, the XUDT message must be converted into an LUDT message, and an LUDT message when a message is transmitted from a B-ISDN network to an N-ISDN network. Must be converted to an XUDT message.

Conventionally, an algorithm for converting the above-described message is required at the interworking node between the B-ISDN network and the N-ISDN network.

As described above, in the prior art, an algorithm for converting the above-described message is required at the interworking node between the B-ISDN network and the N-ISDN network.

Accordingly, an object of the present invention is to provide a message conversion method of a network interworking node performing message conversion in an interworking node between a B-ISDN network and an N-ISDN network.

1 is a network configuration diagram of a NO.7 wireless switching system;

2 is a block diagram of a message conversion unit according to an embodiment of the present invention;

3 is a diagram illustrating a message processing process according to a preferred embodiment of the present invention;

4 is a configuration diagram of a message conversion buffer of FIG. 2;

5 to 8 are flowcharts of a message conversion method according to a preferred embodiment of the present invention.

The present invention for achieving the above object is a message receiving unit for retrieving whether a message is to be sent to a network using a different type of message, when a message is received from one network, and a message received by the message receiving unit Is a message to be transmitted to a network using a different type of message, a conversion unit for converting the message into the other type, and a message transmitting unit for transmitting the other type of message generated by the conversion unit to the destination node. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details are set forth in the following description and in the accompanying drawings, to provide a more general understanding of the invention, these specific details are illustrated for the purpose of illustrating the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Now, a preferred embodiment of the present invention for performing message conversion in an interworking node between a B-ISDN network and an N-ISDN network will be described.

A preferred embodiment of the present invention will be described with reference to the software configuration diagram according to the message conversion method of the network interworking node shown in FIG. The interworking node 100 includes a message translator 102, and the message translator 102 includes a message transceiving unit 104, a common buffer 106 for message translating, a segment unit 108, and a reassembly unit. It consists of 110. The message transceiver 104 receives an LUDT message from a B-ISDN network, or provides an LUDT message to a B-ISDN network. In addition, the message transceiver 104 receives an XUDT message from an N-ISDN network, or provides an XUDT message to a B-ISDN network. In particular, when the XTST message to be provided to the B-ISDN network is provided, the message transmitting and receiving unit 104 may provide it to the common buffer 106 for message conversion so as to be reassembled, and an LUDT message to be provided to the N-ISDN network is provided. If provided, it is provided to the common buffer 106 for message conversion so that it can be segmented. The reassembly unit 110 reads and reassembles the XUDT message to be provided to the B-ISDN network from the common buffer 106 for message conversion, converts it into an LUDT message, and then converts the XUDT message into the B-ISDN network through the message transceiver unit 104. To be transmitted. The segment unit 108 reads and segments the LUDT message to be provided to the N-ISDN network from the common buffer 106 for message conversion so that it can be transmitted to the N-ISDN network through the message transceiver unit 104.

This message conversion process will be described with reference to FIG. 3. The XUDT message or LUDT message is provided to the message receiver 104a. The message receiver 104a stores the received XUDT message or LUDT message in the buffer 106 according to the state, and provides the message to the segment unit 108 or the reassembly unit 110 to segment or reassemble the message. Output to the network via 104b).

4 shows a detailed configuration diagram of the buffer 106. The buffer 106 includes a user data storage buffer, a routing information table, a message information table, a memory management table, and available buffer area information. It consists of storage units. The routing information table is composed of SPC, REFNBR, which is a local reference number, and INFPTR, which is a pointer of a message information table. The message information table consists of a receive counter RCVCNT, a remaining number of segments REMSEG, a timer TIMER, a read pointer READPTR, and a write pointer WRIPTR. The memory management table stores information about the utilization status of the buffer. The free buffer area stores information about the free area of the buffer for storing user data that is dynamically allocated and used.

Now, the message conversion process according to a preferred embodiment of the present invention will be described with reference to FIGS.

First, referring to FIG. 5, which shows a processing flowchart of the message receiving unit 104a, in step 200, if a message is received from the network, the message receiving unit 104a proceeds to step 202 to transmit the message to the B-ISDN. Find out if this is a XUDT message At this time, if the message receiving unit 104a is an XUDT message to be transmitted to the B-ISDN, the process proceeds to step 204. In step 204, the message receiving unit 104a refers to the information in the header of the XUDT message, and searches whether the message is the first XUDT message of the user data. In general, a large size of user data is segmented into an XUDT message and transmitted and received. If the message is the first XUDT message of the user data, the flow proceeds to step 206 to calculate the size of the total user data using the segmentation information included in the XUDT message. Thereafter, the message receiving unit 104a proceeds to step 208 to allocate a buffer area corresponding to the calculated total user data size. Thereafter, the message receiving unit 104a proceeds to step 210, sets a timer to be driven for a time corresponding to the total user data size, and drives the timer. After that, the flow proceeds to step 212 to notify the reassembler 110 that a message to be reassembled has been transmitted.

If it is not the first XUDT message of the user data in step 204, the flow advances to step 214 to search for the last XUDT message of the user data. At this time, if the XUDT message is the last XUDT message, the process proceeds to step 216, after stopping the timer for the corresponding user data, to step 212, otherwise proceeds to step 212.

If the message received in step 202 is an XUDT message to be transmitted to the B-ISDN network, the message receiving unit 104a proceeds to step 218. In step 218, the message receiving unit 104a searches for an LUDT message to be transmitted to the N-ISDN network. In this case, if the received message is an LUDT message to be transmitted to the N-ISDN network, the process proceeds to step 222, otherwise it is not mentioned because it is not related to the preferred embodiment of the present invention. In step 222, the message receiving unit 104a searches for the first LUDT message of the user data. Here, in general, large user data is segmented into multiple LUDT messages and transmitted and received. If the received message is the first LUDT message of the user data, the message receiving unit 104a proceeds to step 224 to calculate the total user data size using the segmentation information of the XUDT message, and then proceeds to step 226. In step 226, the message receiving unit 104a allocates a buffer area corresponding to the calculated total user data size, and then proceeds to step 228 to set a timer to be driven for a time corresponding to the total user data size. Drive that timer. Thereafter, the message receiving unit 104a proceeds to step 230 and notifies the segment unit 108.

If the message received in step 222 is not the first LUDT message of the user data, the message receiving unit 104a proceeds to step 232 and searches whether it is the last XUDT message of the user data. At this time, if the message is the last XUDT message of the user data, the message receiving unit 104a stops driving the timer for the user data.

If the message is not received in step 200, the message receiving unit 104a proceeds to step 236 to search for a timed out timer. If there is a timer that has timed out, the message receiving unit 104a proceeds to step 238 to clear the buffer area, the outing information table, and the message information table for the user message corresponding to the timed out timer.

The operation of the reassembly unit 110 message receiving unit 104a will now be described with reference to the processing flowchart shown in FIG. If there is a reception notification of the XUDT message in step 300, the reassembly unit 110 proceeds to step 302 and performs order control by referring to the segmentation information included in the received XUDT message and the information stored in the message information table. . After the sequence control is performed in this way, the reassembly unit 110 proceeds to step 304 to search for errors in the sequence control result. Thereafter, if there is an error, the reassembly unit 110 proceeds to step 306 and provides an XUDT message for an error occurrence notification to the calling node through the message transmitter. If there is no error, the process proceeds to step 308 to determine whether the received XUDT message is the last message of all user data. In this case, if the received message is the last message of all user data, the process proceeds to step 314 and, if otherwise, to step 310. In step 310, the reassembly unit 110 stores routing information, segmentation information, buffer location information, timer identification information, etc. necessary for assembling the XUDT message, and proceeds to step 312, and the user data in the received XUDT message. Part is stored in the buffer area for user data storage. If the XUDT message received in step 308 is the last message for all the user data, the process proceeds to step 314 to stop driving of the timer corresponding to the user data, and then proceeds to step 316. In step 316, the reassembly unit 110 formats the user data stored in the buffer into an LUDT message by referring to the information in the routing information table, and then proceeds to step 318. The reassembly unit 110 provides the LUDT message to the called node through the message transmitter 104b in step 318.

The operation of the segment unit 108 will be described with reference to the processing flowchart shown in FIG. If there is an LUDT message reception notification in step 400, the segment unit 108 performs step control by referring to the segmentation information included in the received LUDT message and the information stored in the message information table. Thereafter, the segment unit 108 proceeds to step 404 to search for errors in the sequence control result, and if so, proceeds to step 406 and sends an LUDT message for an error occurrence notification to the originating node through the message transmitter. to provide. If there is no error, the process proceeds to step 408 to determine whether the received LUDT message is the last message for all user data. At this time, if the received LUDT message is the last message for all user data, the process proceeds to step 414 and, if otherwise, to step 410. In step 410, the segment unit 108 stores routing information, segmentation information, buffer location, and the like necessary for the LUDT message segment. The segment unit 108 proceeds to step 412 and stores the user data portion in the received LUDT message in the buffer area for storing the corresponding user data. In step 414, the segment unit 108 stops driving the timer corresponding to the user data, and then proceeds to step 416. FIG. In step 416, the segment unit 108 formats the user data stored in the buffer into an LUDT message by referring to the information in the routing information table. In step 418, the LUDT message is provided to the called node through the message transmitter.

The operation of the message transmitter 104b will now be described with reference to the processing flowchart of FIG. 8. The message transmitter 104b searches whether the message is provided in step 500. At this time, if the message is provided, it is checked whether the state of the called node is available, and if so, the process proceeds to step 504 to transmit the message. The message transmitter 104b then proceeds to step 506 to clear the table and buffer for the message.

As described above, the present invention has the following effects as a function of converting a message required by an interworking node for interworking between an N-ISDN network and a B-ISDN network having different network characteristics.

N-ISDN and B-ISDN networks that use different protocols are converted and transmitted by the interworking nodes into NO.7 SCCP signaling messages, enabling interworking between the two networks. Can provide services.

In addition, the present invention employs a dynamic memory management method when segmenting and assembling messages with irregular user data sizes, thereby reducing the amount of messages that cannot be processed due to lack of buffer space, resulting in additional message conversion errors. You can also reduce the message.

As described above, the present invention provides a method for converting between an XUDT message and an LUDT message in an interworking node performing interworking between an N-ISDN network and a B-ISDN network.

Claims (2)

In the message conversion method in a node for interworking N-ISDN network and B-ISDN network, Determining whether the XUDT message received from the N-ISDN network is a message to be transmitted to the B-ISDN network; If it is determined in the determination process, storing user data including all XUDT messages received from the N-ISDN network in a buffer; Reassembling and converting the user data stored in the buffer into an LUDT message suitable for transmission to the B-ISDN network; And transmitting the formatted LUDT message to the B-ISDN network. In the message conversion method in a node for interworking N-ISDN network and B-ISDN network, Determining whether an LUDT message received from the B-ISDN network is a message to be transmitted to the X-ISDN network; If determined in the determination process, storing user data including all LUDT messages received from the B-ISDN network in a buffer; Segmenting and converting user data stored in the buffer into an XUDT message suitable for transmission to the N-ISDN network; And transmitting the formatted XUDT message to the N-ISDN network.