KR100590171B1 - Apparatus and method for processing of isdn message - Google Patents

Abstract

The present invention is to efficiently process the ISDN message having a variable length, the system first to store the input message in order to prevent the loss of the message due to overflow caused by input of a message exceeding the capacity that can be processed A buffer is further provided, and only a message of a capacity that can be processed is input.

Integrated Service Digital Network (ISDN), ISDN Messages, Dual Port Random Access Memory (DPRAM), Buffers, Variable Size Messages

Description

Apparatus and method for processing ISDN message {APPARATUS AND METHOD FOR PROCESSING OF ISDN MESSAGE}             

1 is a diagram illustrating a CO performing communication including an ISDN system and an ISDN system and an ISDN message.

2 is a diagram illustrating an apparatus for transmitting ISDN messages between hardware (H / W) and device drivers of an ISDN system according to the prior art.

3 is a diagram illustrating an apparatus for transmitting ISDN messages between a H / W and a device driver in an ISDN system according to the present invention.

4 is a flowchart illustrating an ISDN message transmission method using an ISDN message transmission apparatus according to the present invention.

The present invention relates to an apparatus and method for transmitting ISDN messages used in an ISDN system, and more particularly, to an apparatus and method for transmitting ISDN messages between a device driver and a hardware driver of an ISDN system.

In general, in ISDN (Integrated Services Digital Network) communication, in addition to the data transmitted and received between systems, the ISDN message used for setting the communication environment should be transmitted. Any system having an ISDN interface (hereinafter referred to as an "ISDN system") exchanges this ISDN message with a partner system to which communication is to be made. Through the exchange of ISDN messages, ISDN messages can perform the initial communication configuration process. In addition, a configuration change may be performed using an ISDN message during communication with a counterpart system through a transmission line configured through an initial configuration process.

1 is a diagram illustrating a CO performing communication including an ISDN system and an ISDN system and an ISDN message.

1 illustrates a connection between an ISDN system and a central office (CO) 100.

As shown in FIG. 1, an ISDN system may be composed of hardware (H / W) 110, a device driver 120, and upper devices (not shown). The H / W 110 receives a signal including data such as an ISDN message from the CO 100 and transmits the signal to the higher device driver 120.

The device driver 120 generally performs the functions required by the application program using the exact machine language needed to operate each device and detailed information about the characteristics of each device. Various device drivers 120 are used to manage various peripheral devices having different specifications and characteristics. The device driver 120 shown in FIG. 1 is specifically for ISDN communication. Unless otherwise stated, "device driver" means a device driver for ISDN communication.

In general, ISDN message transmission between the H / W 110 and the device driver 120 is performed through Inter Processor Communication (IPC). Referring to FIG. 2 below, the ISDN message transmission between the H / W 110 and the device driver 120 of the ISDN system will be described.

2 is a diagram illustrating an apparatus for transmitting ISDN messages between hardware (H / W) and device drivers of an ISDN system according to the related art.

As shown in FIG. 2, ISDN message transmission between the H / W 110 and the device driver 120 is performed through a message queue 210 implemented by dual port random access memory (DPRAM). Since DPRAM has two address lines, two processors can be accessed simultaneously.

First, transmission of an ISDN message received from the CO 100 is described. Meanwhile, hereinafter, an ISDN message received from the CO 100 through a transmission line will be referred to as an "event message".

As shown in FIG. 2, H / W 110 receives event message 201 from CO 100 and outputs the received event message 201 to event message queue 212. The event message queue 212 stores the event message input from the H / W 110 and outputs the event message to the event processing module 220 of the device driver 120. The event processing module 220 interprets the event message input from the event message queue 212 and performs an event required by the event message. Such event interpretation and event performance performed by the event processing module 220 will be referred to as "event processing".

Next, transmission of the ISDN message to be transmitted to the CO 100 will be described. Meanwhile, the ISDN message to be transmitted from the device driver 120 to the CO 100 through the transmission line will be referred to as a "command message".

As shown in FIG. 2, the device driver 120 receives a command message 231 from a higher level and outputs the received command message 231 to the command message queue 214. The command message queue 214 stores a command message input from the device driver 120 and outputs the command message to the line signal processing module 240 of the H / W 110. The line signal processing module 240 converts the command message input from the command message queue 214 into a signal that can be transmitted through the transmission line for transmission to the CO 100. The process performed by the line signal processing module 240 will be referred to as "line signal processing" below.

However, the event message queue 212, the event processing module 220, the command message queue 214, and the line signal processing module 240 all have limitations that can be processed. That is, the event processing module 220 and the line signal processing module 240 have a processing speed limit, and the event message queue 212 and the command message queue 214 have a limit of a storage capacity. Thus, when the event message queue 212 and the command message queue 214 become able to process the input ISDN message and process the next ISDN message, respectively, the event processing module 220 and the line signal processing module 240 respectively. Until then, the ISDN message input from the H / W 110 and the device driver 120 should be stored. However, due to the above-mentioned limitations, the event message queue 212 and the command message queue 214 may have an overflow in which ISDN messages are exceeded. Such an occurrence of overflow will be described with an example of a primary rate interface (PRI) of the ISDN interface.

In general, PRI uses 30 channels (CHannel) on one link, and the maximum length of ISDN message is 256 bytes. In contrast, the size of the DPRAM 210 used as a message queue for message transmission of the board, that is, the H / W 110 and the device driver 120 is limited. As a result, when call setup is performed at the same time, a large amount of ISDN messages are input to the message queue, which is likely to overflow. Meanwhile, the board may be implemented as F / W (FirmWare) instead of H / W.

If an overflow occurs, the overflowed ISDN message is lost. Therefore, in order to solve such a problem, an ISDN system requires an apparatus and a method for transmitting an ISDN message so that no overflow occurs.

On the other hand, the DPRAM 210 used as the message queue in the ISDN message transmission device is not easy to expand its capacity due to the high price. Accordingly, there is a need for an apparatus and method for transmitting ISDN messages that can prevent overflow that occurs in the message queue without involving capacity expansion of the DPRAM 210.

Accordingly, an object of the present invention is to provide an apparatus and method for transmitting ISDN messages in which no overflow occurs.

Another object of the present invention is to provide an apparatus and a method for transmitting an ISDN message so that no overflow occurs without the expansion of the DPRAM.

The present invention includes an additional buffer at the front end of the message queue, overflows the message queue by first storing the message to be input to the message queue in the additional buffer, and then inputting only the ISDN message of the capacity that the message queue can process into the message queue. Do not do it.

An apparatus for processing an ISDN message received from a transmission line provided by the present invention includes an event message buffering buffer for storing an event message which is an ISDN message received from a hardware unit, and an event message stored in the event message buffering buffer. An ISDN message processing apparatus including an event message queue for receiving and storing only event messages having a capacity that can be stored therein, and an event processor for receiving and processing event messages stored in the event message queue.

Meanwhile, an apparatus of the present invention for processing an ISDN message received from a device driver includes a command message buffering buffer for storing a command message which is an ISDN message received from a device driver, and a command message stored in the command message buffering buffer. And a command message queue configured to receive only a command message having a capacity that can be stored therein, and a line signal processor configured to receive and process a command message stored in the command message queue.

In addition, a method for processing an ISDN message according to the present invention includes a first process of receiving an ISDN message, a second process of storing the received ISDN message in a buffer, and storing an additional ISDN message in an ISDN message queue. A third process of determining whether there is an extra storage space, a fourth process of measuring the size of the extra storage space when it is determined that there is extra storage space in the ISDN message queue, and a size measured from the buffer ISDN message processing method comprising the fifth step of reading the ISDN message of the size to be stored in the ISDN message queue.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

First, terms used in describing the present invention are defined. Definitions for the terms described below are used in the present invention, and unless otherwise stated, the present definitions will be used herein.

"ISDN system" refers to all systems having an ISDN interface.

"Device driver" means a device driver for ISDN communication.

"Event message" means an ISDN message that the H / W receives from the CO over the transmission line.

"Event processing" means interpreting an event message performed by an event processing module and performing an event accordingly.

"Command message" means an ISDN message to be sent to the CO via a transmission line.

"Line signal processing" refers to a process performed by the line signal processing module for converting a command message to be transmitted through a transmission line.

3 is a diagram illustrating an apparatus for transmitting ISDN messages between a H / W and a device driver of an ISDN system according to the present invention.

As shown in FIG. 3, the apparatus for transmitting ISDN messages according to the present invention includes an event message buffering buffer 300 and a command message buffering buffer 310. In the present invention, an event message 201 to be transmitted from the H / W 110 to the device driver 120 and a command message 231 to be transmitted from the device driver 120 to the H / W 110 are stored in the message queue 210. Before doing so, the data is first stored in the event message buffering buffer 300 and the command message buffering buffer 310, respectively.

First, the transmission of the command message 231 using the command message buffering buffer 310 will be described.

The command message buffering buffer 310 eliminates the loss of the command message 231 due to the overflow of the command message queue 214 with respect to the command message 231 transmitted from the device driver 120 to the H / W 110. Have enough size to prevent. The command message 231 is stored in the command message buffering buffer 310 and transmitted to the command message queue 214. At this time, the command message buffering buffer 310 checks the available size of the command message queue 214 and transmits only the command message 231 having a size that the command message queue 214 can store to the command message queue 214.

On the other hand, such a check on the usable size of the command message queue 214 may be performed by the command message queue 214, not the command message buffering buffer 310. In this case, the command message queue 214 checks whether there is an extra storage space to store additional command messages 231, checks the amount of the extra storage space, and then executes a command corresponding to the extra storage space. The control signal for requesting further transmission of the message 231 may be output to the command message buffering buffer 310. The command message buffering buffer 310 which receives such a control signal from the command message queue 214 transmits a command message 231 having a size indicated by the received control signal to the command message queue 214. Here, the transmission of the command message from the command message buffering buffer 310 to the command message queue 212 may use an interrupt or a timer job. That is, the command message stored in the command message buffering buffer 310 is transmitted to the command message queue 214 at regular intervals in an interrupt or timer job.

At this time, in the command message queue 214, the command message 231 is processed to a variable size, for efficient use of the command message queue 214. ISDN messages have different message sizes depending on their type, with a maximum size of 256 bytes. However, when the command message queue 214 sets the processing size of the command message to 256 bytes, the maximum size, the command message queue 214 is wasted in case of a short command message. Therefore, the command message is processed to a variable size to increase the efficiency of the command message queue 214. At this time, the message format can be in the format of PORT + SIZE + DATA. Here, PORT may be regarded as information on a port to transmit a command message, SIZE is the size of a command message, and DATA may be viewed as an actual command message.

Next, the transmission of the event message 201 using the event message buffering buffer 300 will be described.

The event message buffering buffer 300 loses the event message 201 due to the overflow of the event message queue 212 with respect to the event message 201 transmitted from the H / W 110 to the device driver 120. Have enough size to prevent. The event message 201 is stored in the event message buffering buffer 300 and transmitted to the event message queue 212. At this time, the event message buffering buffer 300 checks the available size of the event message queue 212 and transmits only the event message 201 of the size that the event message queue 212 can store to the event message queue 212.

Meanwhile, the event message queue 212 may be performed by the event message queue 212 instead of the event message buffering buffer 300. In this case, the event message queue 212 checks whether there is extra storage space for storing additional event messages 201, checks the amount of extra storage space, and then checks the amount of extra storage space. The control signal for requesting further transmission of the message 201 may be output to the event message buffering buffer 300. The event message buffering buffer 300 receiving such a control signal from the event message queue 212 transmits an event message 201 having a size indicated by the received control signal to the event message queue 212. Here, the transmission of the event message from the event message buffering buffer 300 to the event message queue 212 may use an interrupt or a timer job.

At this time, the event message is processed to a variable size for efficient use of the event message queue 212.

Referring to the process of ISDN message transmission using the ISDN message transmission device as follows.

First, the transmission of the command message 231 will be described.

(1) The device driver 120 stores the command message 231 in the command message buffering buffer 310. In this case, the command message 231 may be stored in the command message buffering buffer 310 in the form of PORT + SIZE + DATA.

(2) The command message stored in the command message buffering buffer 310 is transmitted to the command message queue 214 by using an interrupt or timer job. In this case, the following processes are performed.

Check the currently available size of command message queue 214.

If the next command message to be sent to the command message queue 214, stored in the command message buffering buffer 310, is smaller than the size of the currently available command message queue 214, the size of the next command message is checked. This size check of the command message is repeated.

Send a command message smaller than the currently available size of the command message queue 214 from the command message buffering buffer 310 to the command message queue 214.

(3) The line signal processing module 240 receives a command message from the command message queue 214 and processes it.

Next, transmission of the event message 201 will be described.

(1) The line signal processing module 240 of the H / W 110 stores the event message 201 received from the CO 100 in the event message buffering buffer 300.

(2) The event message stored in the event message buffering buffer 300 is transmitted to the event message queue 212 by using an interrupt or timer job. In this case, the following processes are performed.

Check the currently available size of event message queue 212.

If the next event message to be sent to the event message queue 212, which is stored in the event message buffering buffer 300, is smaller than the size of the currently available event message queue 212, the size of the next event message is checked. Repeat this event message size check.

Send an event message smaller than the currently available size of the event message queue 212 from the event message buffering buffer 300 to the event message queue 212.

(3) The event processing module 220 receives an event message from the event message queue 212 and processes it.

Such a method according to the present invention will be described with reference to a flow chart.

4 is a flowchart illustrating an ISDN message transmission method using an ISDN message transmission apparatus according to the present invention.

In step 400, an ISDN message is received. In step 402, the ISDN message received in step 400 is stored in a buffer. In step 404, it is determined whether the DPRAM, that is, the message queue 210 can further store another ISDN message. If the message queue 210 can further store another ISDN message, step 406 is performed. In step 406, the message queue 210 checks a size that can be further stored, and transmits an ISDN message corresponding to the size to the message queue 210.

The flowchart shown in FIG. 4 may be applied to the transmission of both the event message 201 and the command message 231. However, when the event message 201 is transmitted, the ISDN message received in step 400 is an event message, the buffer in step 402 is an event message buffering buffer 300, and the message queues in steps 404 and 406. 210 corresponds to the event message queue 212. When the command message 231 is transmitted, the ISDN message received in step 400 is a command message, the buffer in step 402 is a command message buffering buffer 310, and the message queues in steps 404 and 406. 210 corresponds to the command message queue 214.

The present invention of storing a message to be transmitted in a buffer first and then transmitting the message to a message queue is not limited to an ISDN system but also to a system shared by multiple channels, even when many messages are generated at the same time. The loss of a message can be prevented.

In addition, if the message length is different according to the type of message, processing the message with variable length enables efficient use of the limited queue without waste.

By using the present invention as described above, it is possible to prevent an overflow that occurs during message processing in an ISDN system. This enables efficient ISDN message transmission without loss of ISDN messages.

Claims (11)

An apparatus for processing an ISDN message, the apparatus comprising: An event message buffering buffer for storing an event message which is an ISDN message input from a hardware unit; An event message queue for receiving and storing only event messages having a capacity that can be stored among event messages stored in the event message buffering buffer; And an event processing unit configured to receive and process an event message stored in the event message queue. 2. The apparatus of claim 1, wherein said event message queue is DPRAM. The control of claim 1, wherein the event message queue determines whether the event message queue is capable of further processing an event message, and requests to transmit another event message to the event message buffering buffer when it is determined that the event message can be processed further. ISDN message processing device that outputs a signal. The method of claim 1, wherein the event message buffering buffer determines whether the event message queue is capable of further processing an event message, and when the event message queue determines that the event message queue can further process an event message, And checking the processable size and then sending an event message of processable size to the event message queue. The ISDN of claim 1, wherein the event message stored in the event message buffering buffer is a message including information on a transmission line used to receive the event message, size information of an event message, and content information of an event message. Message processing unit. An apparatus for processing an ISDN message, the apparatus comprising: A command message buffering buffer which stores a command message which is an ISDN message received from the device driver, A command message queue for receiving and storing only command messages having a capacity that can be stored among the command messages stored in the command message buffering buffer; And a line signal processor configured to receive and process a command message stored in the command message queue. The method of claim 6, And the command message queue is DPRAM. The method of claim 6, wherein the command message queue determines whether the command message queue is capable of further processing the command message, and requests that another command message be transmitted to the command message buffering buffer if it is determined that the command message can be further processed. ISDN message processing device that outputs a signal. The method of claim 6, wherein the command message buffering buffer determines whether the command message queue is capable of further processing a command message, and when the command message queue determines that the command message queue can further process a command message, An ISDN message processing apparatus for checking a processable size and then transmitting a command message having a processable size to the command message queue. 7. The ISDN of claim 6, wherein the command message stored in the command message buffering buffer is a message including information on a transmission line to be used for transmission of the command message, size information of the command message, and content information of the command message. Message processing unit. A method for processing an ISDN message, A first step of receiving an ISDN message, Storing the received ISDN message in a buffer; Determining whether there is extra storage space in the ISDN message queue to store additional ISDN messages; If it is determined that there is extra storage space in the ISDN message queue, a fourth process of measuring the size of the extra storage space; And transmitting a ISDN message corresponding to the measured size from the buffer to the ISDN message queue.

Images