JPH03220953A - Transmission message processing system in communication system - Google Patents

Abstract

PURPOSE:To realize the display of a transmission message to a display pattern in a form giving no hindrance by detecting a missing state of a transmission message to be received through the check of a serial number by a detection check means and displaying the transmission message whose serial number is eliminated. CONSTITUTION:A serial number control section 20 provided to a receiver side communication node 2 discriminates whether or not a serial number 4 of a transmission message 3 to be received is advanced cyclicly continuously to detect whether or not the received transmission message 3 is missing. On the other hand, when no serial control section 20 is provided to the receiver side communication node 2, a transmission message display control section 21 displays a character code of the transmission message 3 added with a character code representing the serial number 4 onto a display screen of a display device 5. Thus, the display of the message onto the display screen 5 is realized in a readable form.

Description

[Detailed Description of the Invention] [Summary] Regarding a transmission message processing method in a communication system consisting of a transmission side communication node that transmits a transmission message and a reception side communication node that receives the transmission message and displays it on a display screen, To enable a communication node on the receiving side to detect a lost state of a transmitted message, and to display the transmitted message on a display screen in a format without any hindrance even if the receiving side communication node does not have such a detection function. For the purpose of this, when a serial number specifying a character code other than a screen control code is cyclically assigned to a transmitted message, and the receiving communication node is equipped with a detection check means for the serial number,
By checking the serial number according to the detection checking means, the lost state of the received transmitted message is detected, and the transmitted message from which the serial number has been removed is displayed, and when the detection checking means is not provided, Configure it to display the sent message with the character code represented by the serial number.

[Industrial application field]

The present invention enables a receiving side communication node that displays a transmitted message sent from a transmitting side communication node on a display screen to detect a lost state of a transmitted message, and does not have such a detection function. The present invention relates to a method for processing outgoing messages in a communication system, which allows the display of outgoing messages on a display screen in a trouble-free manner, even in the case of a communication system.

When performing data communication, it is necessary to take measures to detect the occurrence of data loss on the transmission path, and to perform retransmission in the event of data loss. At the communication control level, a modulo 8 or modulo 128 serial number assignment method, similar to that seen in HDLC procedures, is adopted, and the occurrence of data loss is detected by monitoring the serial number assigned by the communication node on the receiving side. to do
It is also necessary to provide such a data loss detection function for user application data included in zero-communication data that is subject to high security.

[Conventional technology]

In a communication system such as communication between personal computers that uses a non-procedural transmission control method as a transmission control procedure,
This communication system does not have a means to detect the occurrence of data loss on the transmission path.In other words, such communication system does not have a means to detect the loss of user application data included in the communication data. .

In such a communication system, in order to detect the loss of user application data included in communication data, it is necessary to use a modulo system that cyclically assigns numbers from 0 to 7 to the user application data to be transmitted. One possible solution would be to adopt a serial numbering system such as 8.

[Problem to be solved by the invention]

However, if the user application data to be transmitted is configured to be assigned a serial number using a method such as modulo 8, if the communication node on the receiving side is equipped with a function to detect the assigned serial number, the serial number assigned to the serial number area will be Although there is no problem because it can be recognized as a serial number,
If the application does not have such a function and processes the sent user application data so that it is displayed as is on the display screen, the serial number assigned to the serial number area is determined to be the screen control code, and the carriage return is executed. This causes the problem that the sent user application data is displayed in a mess on the display screen.

In other words, for communication systems that have not previously been equipped with a function for losing user application data contained in communication data, serial numbers are assigned according to a general serial numbering method such as modulo 8, which is used at the communication control level. If you try to detect data loss by using this method, if the communication node on the receiving side does not have a mechanism to recognize the serial number area set in the incoming user application data, random messages may appear on the display screen. What will happen is that you will end up doing this.

The present invention has been made in view of the above circumstances, and provides a communication system comprising a transmitting side communication node that transmits a transmitted message, and a receiving side communication node that receives the transmitted message and displays it on a display screen. A new technology that enables a communication node on the receiving side to detect the lost status of a transmitted message, and also to display the transmitted message on a display screen in a readable format even if the receiving side communication node does not have such a detection function. The purpose of this research is to provide a method for processing outgoing messages in a communication system.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle configuration of the present invention.

In the figure, 1 is a transmitting side communication node, which sends outgoing messages, 2 is a receiving side communication node, which receives incoming outgoing messages and displays them on a display screen, and 3 is a transmitting side. The message is user application data sent from the sending communication node 1 to the receiving communication node 2. 4 is a serial number given to the sending message 3 and specifies a character code other than the screen control code. 5 is a display device connected to the receiving side communication node 2, and is a serial number represented by bit data 3 that is being sent.
IO is a sending message editing unit provided in the sending communication node l and executes editing processing of the sending message 3 to be sent; 11 is a serial numbering unit provided in the sending communication node 1 20 is a serial number control unit provided in the receiving side communication node 2, which detects and checks the serial number 4 attached to the transmitted message 3. 21 is a transmitted message display control unit provided in the receiving side communication node 2, which detects whether a lost state has occurred in the transmitted message 3, and controls the display of the transmitted message 3 to be displayed on the display screen of the display device 5. It is intended to carry out the following.

[Effect]

In the present invention, when the transmission message 3 edited by the transmission message editing section 10 is transmitted, the serial number assigning section 11 uses bit data to specify a character code other than the screen control code for the transmission message 3. Processing is performed so that the indicated serial number 4 is cyclically assigned.

When the receiving side communication node 2 is equipped with a serial number controller 20, the serial number controller 20 is capable of determining whether or not the serial number 4 of the transmitted message 3 to be received is continuously incremented in a cyclical manner. Then, the sent message 3 to be received
It is detected whether or not a lost state has occurred, and when the occurrence of a lost state is detected, a request is made to the transmitting side communication node 1 to perform recovery processing such as retransmission of the lost transmitted message 3. Then, the transmitted message display control unit 21 removes the serial number 4 detected by the serial number control unit 20 from the received transmitted message 3, and displays the character code of the transmitted message 3 from which the serial number 4 has been removed on the display device 5. Process so that it is displayed on the display screen.

On the other hand, when the receiving communication node 2 does not include the serial number control section 20, it cannot recognize the serial number 4 given to the transmitted message 3, so the transmitted message display control section 2
1 processes to display on the display screen of the display device 5 a character code in which the character code represented by the serial number 4 is added to the character code represented by the transmitted message 3.

In this way, even if the character code represented by serial number 4 is displayed as is on the display screen, the character code represented by serial number 4 does not include the screen control code, so the transmission displayed on the display screen message 3
Although a character code different from the original one is included in the message, since screen operations such as carriage returns are not performed, the reading of the transmitted message 3 is not hindered.

As described above, according to the present invention, if the receiving side communication node 2 is equipped with the serial number control unit 20, it becomes possible to detect the lost state of the data of the transmitted message 3, which is the user application data, according to the serial number management. Even without the serial number control unit 20, it is possible to display the transmitted message 3 on the display device 5 in a readable format.

〔Example〕

Hereinafter, the present invention will be explained in detail according to examples.

FIG. 2 shows the system tank bottom of the Pakent exchanger system to which the present invention is applied. In the figure, 30 is a Pakenoto exchange;
40a and 40b are network monitoring devices. Network monitoring device 40a
, 40b are terminals housed in the packet switch 30, and are used as remote consoles for monitoring the status of the packet switch 30. This network monitoring device 40a
, 40b sets up a packet call with the maintenance/operation program in the packet switch 30, receives autonomous messages sent from the packet switch 30 as a higher-level application, and displays the contents of the autonomous messages on a display screen. By displaying the information, it is possible to remotely monitor the constantly changing status of packet exchange @30. Here, it is assumed that the network monitoring bag N40a is configured with a dedicated network monitoring device, and the other network monitoring device 40b is configured with a personal computer or the like that uses a non-procedural transmission control method. It is assumed that the system will be configured as follows.

If this autonomous message is lost during data transmission, the network monitoring device 40a.

40b will no longer be able to accurately monitor the status of packet exchange 41!30. Therefore, in the present invention, as shown in FIG.
The network monitoring device 40a is configured to include a serial number area 50 consisting of, for example, 1 byte in an autonomous message sent to the network monitoring device 40a, and to set a serial number in this serial number area 50.

This enables the loss of an autonomous message to be detected on the 40b side. Here, it is preferable to use the serial number area 50 prepared for the autonomous message if it is originally blank in the autonomous message; if there is no such blank, it is prepared by crushing 1 byte of the autonomous message. It will be done. In addition, rFcs in Figure 3
J is a frame check sequence provided to detect errors in transmission, "F" is a flag sequence that indicates the start and end of a frame, "AJ is an address section that indicates the address of the other station or the own station, and "C ” is a control unit that displays control information.

In the present invention, as the serial number assigned to the serial number area 50, instead of using a serial number that follows a general serial numbering method such as modulo 8, bit data that specifies a character code other than the screen control code is used. It is characterized by being configured to use the displayed serial number. For example, when the network monitoring devices 40a and 40b execute data processing using ASCII codes, for example, numbers from rH'21'' to rH'40'' expressed in I hexadecimal are used cyclically as serial numbers. Configure it like this. That is, as can be seen from the explanatory diagram of the ASCII code shown in FIG. 4, "H"21" is "!", rH'22. teeth"""
, rH'23J is "#", ...rH'40J is "@"
As shown above, the numbers rH'21J to rH'40J all correspond to character codes other than screen control codes, so they can be used as serial numbers set in the serial number area 50. Become.

In the present invention, the autonomous message transmitted from the packet switch 30 to the network monitoring devices 40a, 40b is provided with the serial number area 50, and the serial number area 50 is filled with information such as rH'21J to rH' Since the configuration is such that numbers up to 40J are used cyclically as serial numbers, as shown in FIG. will be done.

FIG. 6 shows a packet switch 30 and a network monitoring device 40a.
, 40 b.

As shown in this figure, the packet switch 30 includes a physical control unit 31 that performs electrical interface control with the line.
, a link level control unit 32 that executes data link level protocol control, a packet level control unit 33 that executes packet level protocol control, internal processes of the packet switch 30, and network monitoring devices 40 a, 40
L4/L5 that executes interface control between
It includes a control section 34, a message editing section 35 that edits the autonomous message to be transmitted, and a serial number control section 36 that cyclically assigns serial numbers from rH'21J to rH'40J to the autonomous message to be transmitted. On the other hand, the network monitoring device 40a has a physical control unit 4 corresponding to the physical control unit 31.
1, a link level control section 42 corresponding to the link level control section 32, a packet level control section 43 corresponding to the packet level control section 33, and an L4/L5 control section 44 corresponding to the L4/L5 control section 34, It includes a serial number control unit 45 that executes a check for loss of an autonomous message according to the serial number attached to the autonomous message to be received, and a message screen display unit 46 that analyzes the character code of the autonomous message to be received and displays it on a display screen. . and,
Web monitoring device? It is assumed that the I40b does not include the serial number control unit 45 included in the network monitoring device 40a.

Next, according to the flowchart shown in FIG. 7 executed by the serial number control unit 36 of the packet switch 30 and the flowchart shown in FIG. The processing will be explained.

As shown in step 1 of the flowchart in FIG. 7, the serial number control unit 36 of the packet switch 30 receives a request to send the edited autonomous message from the message editing unit 35, and in the subsequent step 2, sends a request to send the edited autonomous message. The table value of the serial number management table 361 that manages serial numbers is rH'40.
J is determined. As a result of the judgment in step 2, the table value of the serial number management table 361 is rH'40J.
If it is determined that it is not, the process proceeds to step 3, in which the table value of the serial number management table 361 is incremented by one, and in the subsequent step 4, the incremented table value is set in the serial number area 50 of the autonomous message to be transmitted. That is, the table value of the serial number management table 361 is rH'25, for example.
J, the table value of the serial number management table 361 is set to rH'26J according to the process of step 3, and the serial number area 5 of the autonomous message to be transmitted is set to rH'26J.
Therefore, rH'26J is set to 0.

On the other hand, when it is determined in step 2 that the table value of the serial number management table 361 is rH'40J,
Proceeding to step 5, rH'21J is set in the serial number area 50 of the autonomous message to be transmitted, and in the following step 6,
rH'21J is set in the serial number management table 361. In other words, processing is performed such that a serial number is assigned to each cycle.

After setting the serial number in the serial number area 50 of the autonomous message to be transmitted in this way, the serial number control unit 36 requests the L4/L5 control unit 34 to transmit the autonomous message in step 7, and ends the process. do.

When the serial number control unit 45 of the network monitoring device 40a receives the autonomous message transmitted from the packet switch 30, as shown in step 11 of the flowchart of FIG.
In the following step 12, it is determined whether the serial number (received serial number) attached to the autonomous message that is transmitted matches the table value (expected serial number) of the expected serial number management table 451 that manages expected serial numbers. If it is determined in step 12 that the received sequence number is not the expected sequence number, this means that some autonomous messages are lost, so the process proceeds to step 13, where the packet exchange I! 30 to request retransmission of the lost autonomous message.

On the other hand, when it is determined in step 12 that the received serial number is the expected serial number, the process proceeds to step 14, where it is determined whether the received serial number is rH'40J. When it is determined in step 14 that the reception sequence number is rH'40J, the process proceeds to step 15 and sets rH'21J, which is the next expected sequence number, in the expected sequence number management table 451. The serial number area 50 of the autonomous message that has been sent is blanked. On the other hand, when it is determined in step 14 that the received sequence number is not rH'40J, the process proceeds to step 17, where the table value of the expected sequence number management table 451 is incremented by one, and the next expected sequence number is set in the expected sequence number management table 451. A serial number is set, and in the following step 16, the serial number area 50 of the transmitted autonomous message is blanked.

After setting the serial number area 50 blank in this manner, the serial number control section 45 notifies the message screen display section 46 of reception in the following step 18, and ends the process. When this reception notification is received, the message screen display unit 46 determines the character code corresponding to the autonomous message that has been sent, and displays the character code that has been sent on the display screen. The packet switch 3 executes the autonomous message display
0 state monitoring processing is realized.

Since the other network monitoring device 40b connected to the packet switch 30 is not equipped with the serial number control section 45, the process of the flowchart shown in FIG. 8 is executed. Therefore, the message screen display section 46 obtains the character code corresponding to the transmitted autonomous message and the character code corresponding to the serial number set in the serial number area 50, and combines these character codes into one autonomous message. The process of displaying the image on the display screen will be executed as follows. However, as mentioned above, the character code represented by the serial number set in the serial number area 50 does not include the screen control code, so it is possible that the autonomous message displayed on the display screen may contain a character code different from the original one. However, since screen operations such as carriage return are not performed, there is no problem in reading the autonomous messages displayed.

Although the illustrated embodiment has been described, the present invention is not limited thereto. For example, although the embodiment has been described using ASCII code, the present invention is not limited to this. In addition, in the example, bucket.

Although the present invention has been described using an example of application to a communication system, the present invention is not limited thereto and can be applied as is to other communication systems.

〔Effect of the invention〕

As explained above, according to the present invention, in a communication system consisting of a transmitting side communication node that transmits a transmitted message and a receiving side communication node that receives the transmitted message and displays it on a display screen, A communication node can detect a lost state of a transmitted message, and
Even if such a detection function is not provided, it is possible to display a transmitted message on a display screen in a readable format.

[Brief explanation of drawings]

Fig. 1 is a diagram of the principle configuration of the present invention, Fig. 2 is a system configuration diagram of a packet switching system to which the present invention is applied, Fig. 3 is an explanatory diagram of the frame format of communication data according to the present invention, and Fig. 4 is ASC, 11 code explanatory diagram, Figure 5 is bucket 7
) An explanatory diagram of an autonomous message sent from a switch to a network monitoring device, FIG. 6 shows the functional block configuration of the packet switch and network monitoring device, FIG. 7 is a flowchart executed by the serial number control unit of the packet switch, and FIG. 8 is a flowchart executed by the serial number control unit of the network monitoring device. In the figure, 1 is a transmitting side communication node, 2 is a receiving side communication node,
3 is a transmitted message, 4 is a serial number, 5 is a display device, 10 is a transmitted message editing section, 11 is a serial number assigning section, 2
0 is a serial number control section, 21 is a sent message display control section, 3
0 is a packet switch, 40a and 40b are network monitoring devices,
50 is a serial number area, 361 is a serial number management table, 451
is the expected serial number management table.

Claims (1)

[Scope of Claims] A communication system comprising a transmitting side communication node (1) that transmits a transmitted message, and a receiving side communication node (2) that receives the transmitted message and displays it on a display screen. A serial number designating a character code other than the screen control code is cyclically assigned to the serial number, and when the communication node (2) on the receiving side is equipped with a detection check means for the serial number, according to the detection check means. By checking the serial number, it is possible to detect whether or not a lost state has occurred in the received transmitted message, and to display the transmitted message from which the serial number has been removed. A transmission message processing method in a communication system, characterized in that, when there is no serial number, a transmission message having a character code represented by the above serial number is displayed.