JPS63308442A - Massage transmission system - Google Patents

Abstract

PURPOSE:To eliminate the need to input destination information and a message again when the message is lost by providing a means which sends a copy of the message stored in a transmission-side store and forward switching node to a reception-side store and forward switching node again if the message is lost between receiving terminals. CONSTITUTION:When a sent message and destination information are inputted from a transmitting terminal, the storage memory 4 of a transmission-side store and forward switching node stores the message together with the destination information. The message with the destination information is stored as a copy after the message is sent to the reception-side store and forward switching node. The reception-side store and forward switching node sends trouble information to the transmission-side store and forward switching node when it is evident that the message main body is lost or possibly lost owing to the trouble of the storage memory 7 or an error in transmission after the message is received. Consequently, the transmission-side store and forward switching node sends the copy of the message with the destination information to the reception side automatically, so even if the message is lost, the message can be transmitted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to message transmission in a store-and-forward network system, and particularly to a message transmission method suitable for a distributed store-and-forward network system in which a plurality of store-and-forward nodes are connected. .

[Conventional technology]

Conventionally, in message transmission at a store and forward node, a method in which a received message is sequentially relayed and transmitted to the next store and forward node has been common.

However, according to the conventional system, if a store-and-forward node holding a message fails and the message is lost, normal message transmission cannot be performed. Conventionally, there is a system in which transmitted messages are stored in a terminal or node on the transmitting side, and the messages can be retransmitted by inputting the messages again from the outside.

In the conventional system, only the message body without destination information is stored, so in order to resend it, it is necessary to input the destination information again.

Note that this type of technology is based on, for example, CCITT Recommendation x400.
It is described in

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into account the fact that if a message is lost due to a failure or the like in the transmission route, the message can be restored within the network again.
Once a message is lost, there is a problem in that it is necessary to input the message again from outside the network and output the message to the receiving side.

In addition, in other conventional technologies, there is a method of storing the transmitted message in the sending terminal or node and retransmitting it. In this case, only the message body without destination information is stored, so in order to retransmit it, it is necessary to re-address the message to the destination. There is a problem in that information must be entered and it is difficult to automatically resend it.

An object of the present invention is to provide a message transmission system that can output a message to a receiving terminal without inputting the message again from the outside even if the message is lost due to some failure on the transmission path.

[Means for solving problems]

The above purpose is to have a storage memory for storing a copy of the transmitted message in the sending storage node, to store a copy of the message with destination information added in this storage memory, and to The storage and forwarding node that receives the transmission has means for transmitting a copy of the message to the receiving storage and forwarding node in response to a request from a terminal connected to the storage and forwarding node.
Even after transmitting a message to the receiving store-and-forwarding node to which the receiving terminal is connected, a copy of the message is kept, and if the message is lost on the transmission path after the transmitting store-and-forwarding node, This is accomplished by transmitting a copy of the message stored at the sending store and forward node to the receiving store and forward node.

The following two methods are used to trigger the transmission of a copy of the message. One method is to detect a message transmission failure in the receiving storage node and transmitting a notification of the failure to the transmitting storage node, thereby triggering the transmission of a copy of the message.

The other is that the sending storage node informs the receiving storage node of the status of the message, and detects the loss of the message based on this response, which triggers the transmission of a copy of the message. This method is used when a message is lost in the transmission path from the sending storage node to the receiving terminal, and the receiving storage node cannot detect the loss of the message due to its own failure, etc. Apply □ including. The status alignment of the message is sent from the sending storage node to the receiving storage node irregularly or at regular intervals, but in some cases it is sent based on an instruction from a terminal connected to the sending storage node. Both cases are possible, including the case where the data is repeatedly and automatically transmitted from the sending storage node.

[For production]

A storage memory in the sending store-and-forwarding node stores the message together with the destination information when the message and destination information are input from the sending terminal. After the message is sent to the receiving store-and-forward node, the message with destination information is stored as a copy. If, after receiving a message, the receiving store and forwarding node determines that the message itself has or may have been lost due to a failure in the storage memory or a transmission error, it will notify the transmitting store and forwarding node of the message. to send a failure notification. As a result, the sender store-and-forward node automatically sends a copy of the message with destination information to the receiver.
It becomes possible to normally deliver a message even when the message disappears.

Furthermore, if a message disappears without detecting it at the receiving side node or receiving terminal, only a copy of the message exists in the sending side storage node, and the copy is not erased. In this case, the sending storage node queries the receiving storage node for the transmission status of the message, and if the response from the receiving storage node indicates that the message is missing, the message is considered lost. By sending the message again, you can prevent the message from being lost.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 (σ) shows a configuration diagram of a store-and-forward network to which the present invention is applied. 1 indicates a message to be sent, which is input to the network from the sending terminal 2 together with destination information 25. 3 has a storage memory 4 as a transmitting storage and exchange node, and when destination information 25 and transmission message 1 are input, these are added and stored in the storage memory 4 as 5. Reference numeral 6 indicates a receiving side storage node, which has a storage memory 7. 8 is a message transmitted from the transmitting side storage node, and after being stored in the storage memory 7, it is outputted to the receiving side through the receiving terminal 9 as a received message 10.

Next, FIG. 1(b) shows an operation sequence when no message is lost in the system of the present invention.

Destination information 25 and transmission message 1 are input to transmission terminal 2, and during message transmission time 11, transmission request 12 is inputted to transmission terminal 2.
The data is then transmitted to the transmitting storage node 3. At the end of the transmission, a transmission confirmation 13 is returned to the sending terminal, and the sending operation ends.

The sending storage node 3 stores the message in the storage memory 4 as a sending node stored message 5, and transmits the message to the receiving storage node 6 in response to a delivery request 15 during the delivery message holding period 14. Sending node 3
Then, by receiving the delivery confirmation 16, the completion of message transmission is confirmed. Even after receiving the delivery confirmation 16, the sending storage node 3 does not delete the sending node stored message 5, but retains it as a copy of the message. This holding period is referred to as a copy message holding period 24.

The receiving node 6 transmits the message to the receiving terminal 9 using a receiving request 19 during the received message holding period 18 . During the message reception period 21, the received message 10 is output and a reception confirmation 20 is responded. After receiving the reception confirmation 20, the reception storage node 6 transmits a reception confirmation notification 17 to the transmission storage node 3. When the sending storage node 3 receives the reception confirmation notification 17, it erases the sending node storage message 5, and the copy message holding time 24 ends.

FIG. 2 shows an operation sequence when the receiving storage node side detects the disappearance of a message.

If a message loss failure 22 occurs in the receiving storage node 6 after receiving the message, and the receiving storage node 6 detects this, it sends a failure notification 23 to the sending storage node 3.

When the sending storage node 3 receives the failure notification 23, the sending storage node 3 sends the sending node stored message 5 by the delivery request 15.
It is transmitted to the receiving storage node 6. The subsequent processing is the first
This is the same as in Figure (b).

FIG. 3 shows a means for transmitting a copy of a message by specifying it from the transmitting side when the receiving side storage node cannot detect the disappearance of the message. The sending terminal 2 sends a message state adjustment request 25 to the sending storage node 3. At this time, the transmitting side storage node 3 inquires of the receiving side storage node about the transmission status of the message if the copied message is being held during the message status adjustment 26.

According to the message status response 27 from the receiving side storage node,
If a response without the message is sent, the sending storage node sends a copy of the message to delivery request 1.
5, the data is transmitted to the receiving storage node. In addition to the method of transmitting the message state adjustment 26 using the message state adjustment 25 in this embodiment, a method of automatically repeatedly transmitting the message state adjustment 26 from the transmitting side storage node 3 is also included.

FIG. 4 shows a flowchart of the sending storage node. After receiving the transmission request 12 from the terminal (402), it is stored in the sending node storage memory 4 as the sending node storage message 5.
(404).

The stored message is sent to the receiving storage node 6 as a delivery request 15 (406), and a delivery confirmation 16 is received as a response message (408). Thereafter, it waits for a message (410), and if it receives a failure notification 23 from the receiving side storage node 6, it sends the same message again as a delivery request 15. If message status adjustment request 25 is received, message status adjustment 2
6 (413) When the L message status response 27 is received and the response content indicates that the message is being transmitted or has been received,
The process shifts to waiting for message reception again, and if there is no message, delivery request 15 is received. If the reception confirmation 17 is received, the sending node storage message 5 is deleted (412).

FIG. 5 shows a flowchart of the receiving storage node. If delivery request 15 is received (502), delivery confirmation 16 is transmitted (504). Thereafter, when the receiving storage node 6 detects the disappearance of the message through serial number management or the like (506), it transmits a failure notification 23 to the transmitting storage node 3 (520). If it does not disappear (506), a reception request 19 is sent to the receiving terminal (508), and after receiving a reception confirmation 20 (510), a reception confirmation notification 17 is sent to the sending storage node 3 (512). When a message disappears and cannot be detected, the message status interval 26 sent from the sending storage node
is received (514) L, and in response, a message status response 27 is sent to send a response indicating that there is no message (516).
)do.

Figure 6 shows the message format. Transmission message 1 consists only of the main body of the message to be transmitted. The destination information 26 is composed of message ■D added for the purpose of specifying the message and the destination to which the message is to be sent.

The transmission request 12 is composed of a label indicating that it is a transmission request, destination information 26, and a transmission message 1. The delivery request 15 is composed of a label indicating that it is a delivery request, destination information 26, and a transmission message 1. Delivery confirmation 16
is a label indicating that it is a delivery confirmation, and a message I to indicate which message the delivery confirmation is for.
Consists of D. Confirmation of receipt 17. Failure notification 23. The copy message transmission request 25 is similar to the delivery confirmation 16.

The sending node stored message 5 is composed of destination information and a communication message. Message status timing 27 is similar to delivery confirmation. The message status response 28 consists of a label indicating the message status response, a message ID, and a portion displaying the presence/absence status of the message indicated by the message ID.

〔Effect of the invention〕

According to the present invention, in response to a message loss failure that may occur in a store-and-forward network system, the lost message can be transmitted to the receiving side by retransmission without inputting the destination information and message again. be.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a network that is an embodiment of the present invention, FIG. 2 is a diagram for explaining a recovery method when message loss is detected in a receiving storage node, and FIG.
The figure is a diagram for explaining the method for instructing the transmitting side storage node to send a copy, Figure 4 is a flowchart showing an example of the operation of the transmitting side storage node, and Figure 5 is an example of the operation of the receiving side storage node. The flowchart shown in FIG. 6 is a diagram for explaining the message format in the present invention. 2... Sending terminal, 3... Sending node, 4... Sending node storage memory, 6... Receiving node, 7... Receiving node storage memory, 9... Receiving terminal.

Claims (1)

[Claims] 1. A transmitting terminal, a transmitting store and forwarding node to which the transmitting terminal is connected, a receiving store and forwarding node connected from the store and forwarding node via a communication line, and a receiving store and forwarding node connected to the receiving store and forwarding node. In a store-and-forward network system consisting of receiving terminals, after a message is transmitted from the sender store-and-forward node to the receiver store-and-forward node, a copy of the message with destination information is stored in the storage memory of the sender store-and-forward node. means for sending a reception confirmation notification indicating that the output of the message to the receiving terminal has been completed from the receiving store and forwarding node to the transmitting store and forwarding node; and storing the message in the transmitting store and forwarding node. means for deleting the message with destination information attached thereto; means for detecting whether the message has been lost between the sending store and forwarding node and the receiving terminal; and if the message has been lost, the sending store and forwarding node 1. A message transmission system comprising means for transmitting a copy of the message stored in the message to the receiving storage and forwarding node again.