JPS6210459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a message transmission regulation system in a store-and-forward network.

In conventional store-and-forward networks, an originating store-and-switch station (hereinafter referred to as an originating station) did not have a function to refuse acceptance of new messages depending on the number of unsent messages to a destination terminal.

In such conventional examples, for example, when a certain destination terminal is in trouble, a message sent to that destination terminal is sent to the corresponding destination storage and switching station (hereinafter referred to as destination station).
If a large number of messages are input to the destination terminal, these messages cannot be sent to the destination terminal, so the storage device of the destination station is filled with only messages to the destination terminal, and the destination station becomes abnormally congested. Become.

Therefore, not only will other normal terminals accommodated at the destination station be unable to communicate, but furthermore, if a request to send a message to the failed destination terminal occurs, the storage device of the originating station will be unable to communicate with the other normal terminals. There is also a risk that the network will be filled with messages to the destination terminal, and that this will spread throughout the store-and-forward network like an avalanche, resulting in no communication within the network at all.

In addition, even if a relay line connected to a calling station becomes a failure, if a large number of messages are input to terminals accommodated by other stations, the storage device of the calling station will be filled with the messages. It also becomes impossible to communicate between terminals within the originating station.

SUMMARY OF THE INVENTION An object of the present invention is to provide a message transmission regulation system that eliminates the drawbacks of the prior art described above and can prevent abnormal congestion in a store-and-forward network due to failures in terminals or trunk lines. It is in. In short, the present invention aims to regulate message transmission in a store-and-forward network, and is equipped with a message clean output monitoring function in end-to-end communication, counting up message reception counters for each destination, and controlling message reception at destination terminals. It consists of a countdown function of the corresponding reception counter based on notification of the completion of message transmission to a specific destination.This function prevents abnormal accumulation of messages to a specific destination from locking up the entire system, and makes effective use of the store-and-forward network. , and has a significant effect on improving services.

The message transmission regulation system according to the present invention has each storage and forwarding station that constitutes a storage and forwarding network control all the terminals in the network individually, all the terminals are divided into desired groups, or all the terminals are collectively controlled. A counter is provided to record the accumulated messages, and each time a message is received from a terminal housed in the own station, the counter related to the destination terminal is incremented, and the message is sent from the destination terminal to the destination terminal. The counter is counted down by the completion notification,
When a message sending request is received from an arbitrary terminal, the value of the corresponding counter related to the message sending request is checked, and if this value is greater than or equal to a predetermined value, the message is sent by rejecting the message input from that terminal. It is designed to make it possible to regulate transmission.

Embodiments of the present invention will be described below based on the drawings.

The figure is a control system diagram of an embodiment of the message transmission regulation system according to the present invention.

Here, 1a and 1b are packet switching devices related to the storage and switching centers A and B, 2a and 2b are the same storage devices,
3a and 3b are terminals accommodated in the packet switching devices 1a and 1b, 4a and 4b are counters that record the number of messages stored in the storage and exchange stations A and B, and 5 is a trunk line.

These constitute the store and exchange network,
Normally, a store and forward network may include other store and forward centers, relay exchange centers, etc. in addition to these, but these are omitted from the drawings as there is no change in principle even if they are omitted for the purpose of explaining the present invention. It has been done.

Note that the counters 4a and 4b are configured for each terminal in the store and forward network, for each desired group (for example, by store and forward station, by region, by terminal type, etc.), or for all terminals at once. It will be established.

Further, the counters 4a and 4b may be provided as hardware in the packet switching devices 1a and 1b, respectively, or the corresponding areas may be provided in the main storage device under software control, and the areas may be written and read. You can also do this.

First, when there is a message transmission request from the terminal 3a (for example, to the terminal 3b), the packet switching device 1a receives the signal and checks the value of the counter 4a, and if this is not greater than a predetermined value, , returns a transmittable signal, and if the value is greater than or equal to a predetermined value, returns a transmittable signal ().

This predetermined value is, for example, a value that is considered in advance to be unlikely to cause abnormal network congestion, taking into consideration the processing capacity of each storage and forwarding center, the total number of terminals in the network, and the amount of communication. is selected.

If a transmission impossible signal is returned, the terminal 3a
does not send messages.

If the transmission clear signal is returned, the terminal 3a
sends the message MES, and the packet switching device 1a stores it in the storage device 2a, and also increments the counter 4a by +1 ().

Next, the packet switching device 1a transfers the storage device 2a to the storage device 2a.
The message MES is taken out from the terminal, passed through the trunk line 5, and sent to the packet switching device 1b related to the destination station B.
The packet switching device 1b receives it and stores it in the storage device 2b ().

Further, the packet switching device 1b is connected to the storage device 2b.
The message MES in question is taken out and sent to the terminal 3b ().

When the packet switching device 1b completes the transmission, it sends a transmission completion notification ES to the packet switching device 1a through the trunk line 5, and the packet switching device 1a receives this and changes the value of the counter 4a to -.
Count down by 1 ().

As a result, the value of the counter 4a is always changed to the storage device 2 for each target terminal or terminal group.
This shows the number of messages retained in a.

Trunk line 5 is faulty and sends a message to destination B
If the MES is not received, if there is a failure in the terminal 3b or the terminal line and the message MES is not received at the terminal 3b, or if there is another failure, this transmission completion notification ES is sent to the packet switching device. Unable to receive on 1a.

Therefore, the counter 4a is not counted down by -1, and the message MES remains stored in the storage device 2a.

Note that although the above explanation has been made regarding message transmission to terminals of other stations, the same operation is performed in the storage and forwarding station A for internal communication with other terminals (not shown) other than terminal 3a. .

Furthermore, although the description has been made assuming that storage and switching station A is the originating station and station B is the destination station, the reverse case is also exactly the same.

As described in detail above, according to the present invention, when a transmission completion notification is not obtained due to a failure in a terminal or a relay line, and a predetermined number or more of messages remain in the storage device, the counter is checked and a new one is sent. Since it is possible to regulate message transmission requests, it is possible to limit the number of messages staying in the store-and-forward network to an appropriate value. Abnormal congestion can be prevented, and remarkable effects can be obtained in improving the efficiency, reliability, and serviceability of the store-and-forward network.

[Brief explanation of the drawing]

The figure is a control system diagram of an embodiment of the message transmission regulation system according to the present invention. 1a, 1b...packet switching device, 2a, 2b...
Storage device, 3a, 3b...terminal, 4a, 4b...counter, 5...relay line.

Claims (1)

[Scope of Claims] 1. Each storage and forwarding station constituting a storage and forwarding network can have all the terminals in the network individually, all the terminals divided into desired groups, or all the terminals all at once. A counter that can record accumulated messages is provided, and each time a message is received from a terminal housed in the own station, a counter related to the destination terminal is incremented. Therefore, when the counter is counted down and a message sending request is received from any terminal, the value of the counter related to the message sending request is checked, and if this value is greater than or equal to a predetermined value, the counter is counted down. A message transmission regulation method characterized by restricting message transmission by refusing message input. 2. In what is stated in claim 1,
The counter utilizes the main memory of the store and forwarding center,
A message transmission regulation method in which a corresponding area is set up and the accumulated messages are recorded through software processing.