JPH0834493B2 - Transmission message processing method in communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A transmission message processing method in a communication system including a communication node on the transmission side for transmitting a transmission message and a communication node on the reception side for receiving the transmission message and displaying it on a display screen, A communication node on the receiving side can detect a lost state of a transmitted message, and even if it does not have such a detection function, display of the transmitted message on a display screen can be realized in a format that does not interfere. For that purpose, when a serial number for designating a character code other than the screen control code is cyclically added to the transmitted message, and the communication node on the receiving side is equipped with a detection check means for the serial number, the detection check is performed. Lost status of outgoing messages received by checking the serial number according to the method Is detected and the transmission message with the serial number removed is displayed, and when the detection check means is not provided, the transmission message having the character code represented by the serial number is displayed.

[Industrial applications]

INDUSTRIAL APPLICABILITY The present invention enables a communication node on the reception side, which displays a transmission message sent from the communication node on the transmission side on a display screen, to detect a lost state of the transmission message, and does not have such a detection function. Even in some cases, the present invention relates to a transmission message processing method in a communication system that enables a transmission message to be displayed on a display screen in a format that does not hinder the display.

When performing data communication, it is necessary to detect the occurrence of data loss on the transmission path, and to take measures to retransmit when data loss occurs. At the communication control level, a serial number assigning method based on modulo 8 or modulo 128 as used in HDLC procedures is adopted, and the occurrence of data loss is detected by monitoring the serial number assigned to the receiving communication node. The composition is adopted. It is necessary to equip the user application data included in the communication data with such a data loss detection function.

[Conventional technology]

In a communication system such as communication between personal computers that adopts a non-procedural transmission control method as a transmission control procedure, there is no means for detecting occurrence of data loss on the transmission path. That is, such a communication system has no means for detecting the loss of the user application data included in the communication data.

In such a communication system, in order to detect the loss of the user application data included in the communication data, a modulo such that a number from 0 to 7 is cyclically added to the user application data to be transmitted as a serial number. It is conceivable to adopt a serial number assigning method such as No. 8 to deal with this.

[Problems to be Solved by the Invention]

However, if the user application data to be transmitted is configured to be provided with a serial number according to the method such as modulo 8, if the communication node on the receiving side has a function of detecting the serial number to be added, the serial number added to the serial number area will be used. Although there is no problem because it can be recognized as a serial number, if it is a process that does not have such a function and displays the sent user application data as it is on the display screen, change the serial number added to the serial number area. Judging that it is a screen control code, a screen operation such as carriage return may be executed, which causes a problem that the sent user application data is displayed in a mess on the display screen. .

That is, a serial number according to a general serial number assigning method such as modulo 8 used at the communication control level is given to a communication system that does not have a function of losing user application data included in the communication data until then. When trying to realize the detection of data loss by using the above, if the communication node on the receiving side does not have a mechanism for recognizing the serial number area set in the sent user application data, a random display is displayed on the display screen. It will happen that you do.

The present invention has been made in view of such circumstances,
In a communication system including a communication node on the transmission side that transmits a transmission message and a communication node on the reception side that receives the transmission message and displays it on a display screen, the communication node on the reception side can detect the loss state of the transmission message. An object of the present invention is to provide a transmission message processing method in a new communication system that enables the display of a transmission message on a display screen to be realized in a readable format even when such a detection function is not provided.

[Means for solving the problem]

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

In the figure, 1 is a communication node on the transmitting side, which transmits a transmission message, 2 is a communication node on the receiving side, which receives the transmitted transmission message and displays it on a display screen, 3 is transmission A message, which is user application data transmitted from the transmission side communication node 1 to the reception side communication node 2, 4 is a serial number given to the transmission message 3, and specifies a character code other than the screen control code 5 is a display device connected to the reception side communication node 2 and displays the character code of the transmission message 3 being sent, 10 is a transmission side communication node A send message editing unit included in 1 that executes edit processing of a send message 3 to be sent, and 11 is included in the sending communication node 1. A serial number assigning unit that assigns the serial number 4 to the transmitted message 3 to be transmitted, and 20 is a serial number control unit included in the receiving side communication node 2 for detecting and checking the serial number 4 attached to the transmitted message. This is to detect whether or not a loss state has occurred in the transmitted message 3. Reference numeral 21 denotes a transmitted message display control unit included in the receiving side communication node 2 for transmitting the transmitted message 3 displayed on the display screen of the display device 5. Display control is executed.

[Action]

In the present invention, the serial number assigning unit 11 is a transmission message editing unit.
When the send message 3 edited by 10 is sent, a serial number 4 represented by bit data that specifies a character code other than the screen control code is cyclically added to this send message 3 To process.

When the communication node 2 on the receiving side includes the serial number control unit 20, the serial number control unit 20 included therein determines whether or not the serial number 4 of the transmission message 3 to be received continuously and cyclically advances. And send message 3 to receive
It is detected whether or not a lost state has occurred, and when the occurrence of the lost state is detected, recovery processing such as resending of the lost transmission message 3 is requested to the transmitting communication node 1. 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 removed transmitted message 3 of the serial number 4 on the display device 5. Process to display on the display screen.

On the other hand, when the receiving communication node 2 does not include the serial number control unit 20, the serial number 4 added to the transmitted message 3 cannot be recognized, so the transmitted message display control unit 21
Performs processing such that the character code in which the character code represented by the serial number 4 is added to the character code represented by the transmission message 3 is displayed on the display screen of the display device 5. Thus, even if the character code represented by the serial number 4 may be displayed on the display screen as it is, since the character code represented by the serial number 4 does not include the screen control code, the transmission code displayed on the display screen is displayed. Although the message 3 will include a character code different from the original character code, screen operations such as carriage return will not be performed, so that there is no problem in deciphering the transmitted message 3. I won't.

As described above, according to the present invention, if the reception-side communication node 2 includes the serial number control unit 20, it becomes possible to detect the loss state of the data of the transmission message 3 that is the user application data according to the serial number management. Even if the serial number control unit 20 is not provided, the display of the transmitted message 3 on the display device 5 can be realized in a readable format.

〔Example〕

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

FIG. 2 shows a system configuration of a packet switch system to which the present invention is applied. In the figure, 30 is a packet switch,
40a and 40b are network monitoring devices. The network monitoring devices 40a and 40b are
A terminal housed in the packet switch 30 and used as a remote console for monitoring the state of the packet switch 30. The network monitoring devices 40a, 40b set a packet call with the maintenance / operation program in the packet switch 30, receive an autonomous message sent from the packet switch 30 as a higher-level application, and By displaying the contents on the display screen, it is possible to remotely monitor the ever-changing state of the packet switch 30. Here, it is assumed that the network monitoring device 40a is composed of a dedicated network monitoring device, and the other network monitoring device 40b is
It is assumed to be configured by a personal computer or the like that adopts a non-procedure transmission control method.

If the autonomous message is lost during data transmission, the network monitoring devices 40a and 40b cannot accurately monitor the state of the packet switch 30. Therefore, in the present invention, as shown in FIG. 3, the autonomous message transmitted from the packet switch 30 to the network monitoring devices 40a, 40b is provided with a serial number area 50 consisting of, for example, 1 byte. By configuring the serial number to be set to 50, the loss of the autonomous message can be detected on the side of the network monitoring devices 40a and 40b. Here, it is preferable to use the serial number area 50 provided for the autonomous message if the autonomous message originally has a blank. If there is no such blank, one byte of the autonomous message is crushed and provided. Will be done. In FIG. 3, "FCS" is a frame check sequence provided for detecting an error in transmission, "F" is a flag sequence indicating the start and end of the frame, and "A".
Is an address section for displaying the address of the partner station or its own station, and "C" is a control section for displaying the control information.

In the present invention, as the serial number assigned to the serial number area 50, a serial number according to a general serial number assigning method such as modulo 8 is not used, but a bit data that specifies a character code other than the screen control code is used. It is characterized in that it is configured to use the serial number represented. For example, when the network monitoring devices 40a and 40b are executing data processing using ASCII code, for example, the numbers from "H'21" to "H'40" represented in hexadecimal are cyclically serialized. It is configured to be used as. That is, as can be seen from the explanatory diagram of the ASCII code shown in FIG. 4, "H'21"
"!", "H'22" is "", "H'23" is "#",
… "H'40" means "@", and all numbers from "H'21" to "H'40" correspond to character codes other than screen control code. It can be used as a serial number set in the serial number area 50.

In the present invention, as described above, 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 in this serial number area 50, for example, "H'21" to " Since the numbers up to "H'40" are cyclically used as serial numbers, as shown in FIG. 5, the autonomous message with this serial number is transmitted from the packet switch 30 to the network monitoring device 40a, Will be sent to 40b.

FIG. 6 shows a packet switch 30 and network monitoring devices 40a and 40b.
The functional block configuration of FIG. As shown in this figure,
The packet switch 30 includes a physical control unit 31 that executes electrical interface control with a line, a link level control unit 32 that executes data link level protocol control, and a packet level control unit that executes packet level protocol control. 33, which executes interface control between the internal process of the packet switch 30 and the network monitoring devices 40a and 40b.
4 / L5 control unit 34, message editing unit 35 that executes the editing of the autonomous message to be transmitted, and serial number control that cyclically assigns a serial number from "H'21" to "H'40" to the autonomous message to be transmitted. And a section 36. On the other hand, the network monitoring device 40
a is a physical control unit 41 corresponding to the physical control unit 31, a link level control unit 42 corresponding to the link level control unit 32, and a packet level control unit corresponding to the packet level control unit 33.
43, an L4 / L5 control unit 44 corresponding to the L4 / L5 control unit 34, and a serial number control unit 45 that executes a loss check of the autonomous message according to the serial number attached to the received autonomous message,
A message screen display unit 46 for analyzing the character code of the received autonomous message and displaying it on the display screen. The network monitoring device 40b does not include the serial number control unit 45 included in the network monitoring device 40a.

Next, according to the flow chart shown in FIG. 7 which is executed by the sequence number control unit 36 of the packet switch 30 and the flow chart shown in FIG. 8 which is executed by the sequence number control unit 45 of the network monitoring device 40a, the present invention configured in this way The process will be described.

The serial number control unit 36 of the packet switch 30 uses the message editing unit as shown in step 1 of the flowchart of FIG.
When the edited autonomous message transmission request is received from 35, it is determined in the following step 2 whether or not the table value of the serial number management table 361 for managing the serial number assigned last is "H'40". When it is determined in step 2 that the table value of the serial number management table 361 is not "H'40", the process proceeds to step 3 and the serial number management table
Increment the table value of 361 by 1, and then in step 4,
The incremented table value is set in the serial number area 50 of the autonomous message to be transmitted. That is, the serial number management table 361
When the table value of "H'25" is set, for example, the table value of the serial number management table 361 is set to "H'26" according to the processing of step 3, and "H" is set in the serial number area 50 of the autonomous message to be transmitted. '26' is set.

On the other hand, when it is determined in step 2 that the table value of the serial number management table 361 is "H'40", the process proceeds to step 5 and "H'21" is set in the serial number area 50 of the autonomous message to be transmitted. Then, in the following step 6, "H'21" is set in the serial number management table 361. That is, processing is performed so that serial numbers are cyclically assigned.

When the serial number is set in the serial number area 50 of the autonomous message to be transmitted in this manner, the serial number control unit 36 makes a request for transmitting the autonomous message to the L4 / L5 control unit 34 in the subsequent step 7 and ends the process. To do.

When the sequence 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. It is determined whether or not the attached serial number (reception serial number) matches the table value (expected serial number) of the expected serial number management table 451 for managing the expected serial number. If it is determined in step 12 that the received serial number is not the expected serial number, it means that some autonomous message has been lost.
Next, the recovery processing such as requesting the retransmission of the lost autonomous message to the packet switch 30 is executed.

On the other hand, when it is determined in step 12 that the received sequence number is the expected sequence number, the process proceeds to step 14 and it is determined whether the received sequence number is "H'40". If it is determined in step 14 that the received serial number is "H'40", the process proceeds to step 15 to set "H'21" which is the next expected serial number in the expected serial number management table 451 and the subsequent step. In step 16, the serial number area 50 of the sent autonomous message is blanked. On the other hand, if it is determined in step 14 that the received sequence number is not “H′40”, the process proceeds to step 17 and the table value of the expected sequence number management table 451 is incremented by 1 to move to the next expected sequence number management table 451. The expected serial number is set, and in the following step 16, the serial number area 50 of the transmitted autonomous message is blanked.

In this way, when the blank is set in the serial number area 50, the serial number control unit 45, in the following step 18, notifies the message screen display unit 46 of the reception and ends the processing.
Then, upon receiving this reception notification, the message screen display unit 46 seeks the character code corresponding to the sent autonomous message, and displays the obtained character code on the display screen to send the autonomous message. By displaying the message, the state monitoring process of the packet switch 30 is realized.

Another network monitoring device connected to the packet switch 30
Since 40b does not include the serial number control unit 45, the process of the flowchart shown in FIG. 8 is not executed.
Therefore, the message screen display unit 46 obtains the character code corresponding to the sent autonomous message and the character code corresponding to the serial number set in the serial number area 50, and these character codes are set as one autonomous message. The process of displaying on the display screen will be executed. However, as described above, since the character code represented by the serial number set in the serial number area 50 does not include the screen control code, the autonomous message displayed on the display screen may include a character code different from the original one. However, since a screen operation such as a carriage return is not performed, the reading of the displayed autonomous message will not be disturbed.

Although the illustrated embodiment has been described, the present invention is not limited to this. For example, although the ASCII code has been described in the embodiment, the present invention is not limited to this.
Further, although the embodiment has been described with reference to the application example to the packet switching system, the present invention is not limited to this and can be applied to other communication systems as they are.

〔The invention's effect〕

As described above, according to the present invention, in the communication system including the communication node on the transmission side for transmitting the transmission message and the communication node on the reception side for receiving the transmission message and displaying it on the display screen, While the communication node can detect the lost state of the transmitted message,
Even if such a detection function is not provided, the display of the transmission message on the display screen can be realized in a readable format.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of a packet switching system to which the present invention is applied, FIG. 3 is an explanatory diagram of a frame format of communication data according to the present invention, and FIG. ASCII code explanatory diagram, FIG. 5 is an explanatory diagram of an autonomous message transmitted from the packet switching device to the network monitoring device, FIG. 6 is a functional block configuration diagram of the packet switching device and the network monitoring device, and FIG. 7 is a serial number of the packet switching device. FIG. 8 is a flowchart executed by the control unit, 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 transmission message, 4 is a serial number, 5 is a display device, 10 is a transmission message editing unit, 11 is a serial number giving unit, 20 is a serial number control unit, 21 is a transmission message display control unit, 30 is a packet switch, and 40a and 40b are A network monitoring device, 50 is a serial number area, 361 is a serial number management table, and 451 is an expected serial number management table.

Claims (1)

[Claims] 1. A communication system comprising a communication node (1) on the transmission side for transmitting a transmission message and a communication node (2) on the reception side for receiving the transmission message and displaying it on a display screen. When the communication node (2) on the receiving side is provided with a detection check unit for the serial number, the serial number for designating a character code other than the screen control code is cyclically provided By checking the serial number, it is detected whether or not a loss state has occurred in the transmitted message to be received, and processing is performed to display the transmitted message from which the serial number is removed, and the detection check means is not provided. In some cases, processing is performed so that a transmission message having the character code represented by the serial number is displayed. Sending a message processing method in a system.