JPH09205450A - Communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication control method capable of efficiently confirming reception when multi-address communication is performed in a ring- like communication network for which plural nodes are connected. SOLUTION: In this communication control method in the communication network of ring topology, multi-address data are transmitted from a first node connected to the communication network to the plural nodes. Then, a reception result confirming/informing frame for confirming the reception result of the multi-address data is transmitted from the first node to the plural nodes by a relay system. Then, the reception result confirming/informing frame which makes a round of the communication network and is passed through the plural nodes is received in the first node.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control method, and in particular, when broadcast data is simultaneously broadcast to a plurality of nodes connected to a ring communication network, the reception result of each node is confirmed. The present invention relates to a communication control method.

[0002]

2. Description of the Related Art With the progress of advanced information, local areas
Communication systems such as networks (LAN) have been widely used. In such a communication system, a plurality of nodes (terminals) in the system can be broadcast.
In some cases, the information may be notified at once.

FIG. 16 shows an example of the structure of a LAN. Multiple nodes are connected to a one-way ring topology network. Information transmitted from one node reaches the target node through a one-way network. Although not shown, such a communication system may have a network having a bidirectional ring topology which is opposite to each other. In this case, the information transmitted from one node reaches the target node bidirectionally through the reverse network.

In addition, it is possible to broadcast the information from any of the plurality of nodes by broadcast communication. In the case of the one ring network shown in FIG. 16, the broadcast information is transmitted in one direction, but in the case of having two ring networks in opposite directions, the broadcast information is transmitted in both directions. It In the case of broadcast communication, generally, data indicating a plurality of destination nodes is added to the head of a frame on which broadcast information is placed.

FIG. 17 is a diagram for explaining a conventional communication control method in broadcast communication. In FIG. 17, the node # 1 is the transmitting node, and the same information is sent to the node # 2 and the node #.
3 shows a case of broadcasting to node 3, node # 4 and node # 5. Depending on the system, the reception result may not be confirmed after the broadcast communication, but in the communication control method shown in FIG. 17, the node # 1 performs the broadcast communication and then the node # 1 transmits the data. The reception result is confirmed for all the above nodes.

In checking the reception result, first, the node #
1 sends a result confirmation command to one node, and receives a result response from the node indicating whether or not the information broadcasted was correctly received.

[0007]

However, the above-mentioned conventional communication control method has the following problems. In the conventional communication control method, the reception confirmation method in the case of performing the broadcast communication is performed sequentially by all the transmitting destination nodes of the broadcast communication. Therefore, as the scale of the system increases and the number of nodes connected to the system increases, the traffic on the transmission line also becomes enormous.

Further, since the conventional reception confirmation method is performed sequentially for all the destination nodes, the time until the confirmation of the reception results of all the nodes is completed (t shown in FIG. 17). However, there is a problem in that the performance of the system deteriorates. In view of the above problems, an object of the present invention is to provide a communication control method capable of efficiently performing reception confirmation when performing broadcast communication in a ring communication network to which a plurality of nodes are connected.

[0009]

Means for Solving the Problems To solve the above problems, the present invention is characterized by taking the following means. The method of claim 1 is a communication control method in a communication network of a ring topology, comprising: (a) transmitting broadcast data from a first node connected to the communication network to a plurality of nodes; ) Reception result confirmation for confirming the reception result of the broadcast data
A notification frame is transmitted from the first node to the plurality of nodes by a relay method, and (c) the reception result confirmation / notification frame, which has made one round in the communication network and has passed through the plurality of nodes, It is characterized by including each step of receiving at one node.

According to a second aspect of the present invention, in the communication control method according to the first aspect, the step (b) includes (b-
1) The step of registering the reception result information of the second node in the reception result confirmation / notification frame in the second node that could not normally receive the broadcast data, the step (c) comprising: (C-1) In the first node, including the step of obtaining the reception result of the broadcast data by analyzing the reception result information of the reception result confirmation / notification frame that has gone around the communication network once. And

According to a third aspect of the present invention, in the communication control method according to the first or second aspect, the step (b) includes
(B-2) In a third node that receives the reception result confirmation / notification frame before the reception processing of the broadcast data is not completed, the third node transmits the reception result confirmation / notification frame to the third node. (B-3) the fourth node transmits the reception result confirmation / notification frame to the third node after a lapse of a predetermined time after receiving the retransmission request. It further comprises each step of

According to a fourth aspect of the present invention, in the communication control method according to the first or second aspect, the step (b) includes
(B-4) When an abnormality occurs in the communication network,
A reception result confirmation / notification frame is transmitted from each of the nodes adjacent to the location where the abnormality occurs to the first node in a direction opposite to the location where the abnormality occurs in a relay method, and the step (c) includes And (c-2) the first node includes each step of obtaining a reception result of the broadcast data based on the reception result confirmation / notification frame transmitted from each of the adjacent nodes. To do.

According to a fifth aspect of the present invention, there is provided a communication control method in a communication network of ring topology having bidirectional ring paths, comprising: (a) from one first node connected to the communication network. The broadcast data is transmitted to a plurality of nodes, and (b) at least one of the plurality of nodes includes each step of confirming the reception result of the broadcast data to both adjacent nodes.

According to a sixth aspect of the present invention, in the communication control method according to the fifth aspect, the step (b) includes (b-
1) including the step of, at a node adjacent to the second node that could not normally receive the broadcast data, notifying the first node of a reception abnormality regarding the second node, (c) the first node The node further includes a step of obtaining a reception result of the broadcast data based on whether or not the reception abnormality notification is received within a predetermined time.

According to a seventh aspect of the present invention, in the communication control method according to the sixth aspect, the step (c) includes (c-
1) When the reception abnormality notification is received by the first node, the broadcast data is retransmitted by the first node, and (c-2) a node adjacent to the second node is It is characterized by including each step of confirming the reception result of the broadcast data retransmitted to only two nodes.

According to an eighth aspect of the present invention, in the communication control method according to the sixth aspect, the step (b) includes (b-
2) In the nodes on both sides of the second node that could not normally receive the broadcast data, perform a reception abnormality notification regarding the second node to the first node via the bidirectional route. And the step (c) includes (c-
3) In the first node, the reception result of the broadcast data is obtained by receiving the reception abnormality notification from at least one of the nodes adjacent to the second node via the bidirectional route. It is characterized by including a step.

According to a ninth aspect of the present invention, in the communication control method according to the sixth aspect, the step (b) includes (b-
2) In the nodes on both sides of the second node that could not normally receive the broadcast data, perform a reception abnormality notification regarding the second node to the first node via the bidirectional route. And the step (c) includes (c-
4) In the first node, obtaining the reception result of the broadcast data by receiving the reception abnormality notification from at least two nodes adjacent to the second node via at least one of the bidirectional paths, It is characterized by including.

According to the invention method of claim 10,
5. The communication control method according to 5, further comprising a step of generating the broadcast data and transmitting the broadcast data to a node adjacent to the second node that could not normally receive the broadcast data. Is characterized by.

According to the eleventh aspect of the present invention, there is provided the fifth aspect.
In the communication control method described in (d), the nodes adjacent to the second node that could not normally receive the broadcast data generate the broadcast data and send it to the second node, (e) The second node may further include the steps of comparing the broadcast data received from the nodes adjacent to each other and making a request to retransmit the broadcast data to the first node if they do not match. To do.

The above-mentioned method of the invention operates as follows.
In the communication control method according to claim 1, after the broadcast communication,
The first node confirms the reception result only to the adjacent node.
Send a notification frame. In addition, each node does not sequentially return the result notification frame of the reception result to the node, but transmits it to the adjacent node by the relay method.

Therefore, the first node confirms the reception result
During the period from the sending of the notification frame to the reception of the same frame, other processing can be performed without monopolizing the processing. Further, the time (t) from the first node transmitting the reception result confirmation / notification frame to the adjacent node to confirming the result notification of all the destination nodes is
This can be greatly shortened compared to the conventional method (polling method, steady monitoring method, etc.) in which a result confirmation command is sent for each node.

In the communication control method according to claim 2,
The confirmation time (t) of the reception result can be shortened as compared with the conventional method, and the information of the node which has received an error can confirm the reception result.
Since it is registered in the notification frame, it is possible to easily confirm which node is not receiving normally.

By analyzing the reception result information of each node, the first node can grasp the node which could not be normally received and the cause thereof. Therefore, it is possible to shorten the problem / cause separation time at the time of maintenance or failure. In addition, it is possible to automatically change the operation state by using the content of the information in the frame or to incorporate fail-safe processing, etc., and it is possible to easily add a value-added function of quality improvement.

In the communication control method according to claim 3,
While the reception result is being confirmed, even if the processing of the broadcast data is delayed at the node on the way, the reception result can be confirmed again at the adjacent node. Since this reception result confirmation uses only the transmission path to the adjacent node, the confirmation time can be shortened and the result confirmation can be re-received without increasing the traffic. As a result, the reception result can be efficiently confirmed.

In the communication control method according to claim 4,
Even if a failure of the transmission path occurs in the middle of the ring network, the nodes on both sides of the ring return the frame of the reception result to the transmitting node. Therefore, even if a failure of the transmission path occurs, the transmission source node can surely confirm the reception results of all the nodes.

In the communication control method according to claim 5,
If all nodes normally receive the broadcast data, no information is returned to the first node that is the transmission source. Therefore, from this, the first node can confirm that there was no abnormal reception. If there are few abnormal reception nodes,
It is possible to prevent an increase in traffic. Furthermore, the time required to confirm whether or not the broadcast data could be transmitted to all nodes is
When there are few abnormal reception nodes, it can be shortened compared to the conventional method.

On the other hand, when there are many abnormal reception nodes, the reception result can be confirmed by both sides, so that the confirmation can be performed accurately and the quality of communication control can be improved. in this way,
Even if it is not controlled by the first node, each node autonomously confirms the reception result, so that it is possible to efficiently confirm the reception result of all the nodes.

In the communication control method according to claim 6,
In the reception result confirmation of the broadcast data, if there is a node with abnormal reception, the node number is notified from the adjacent node to the first node which is the transmission source. On the contrary, if all the nodes normally receive the broadcast data, no information is returned to the first node which is the transmission source. Therefore, it is possible to prevent unnecessary frames from being transmitted even if the reception abnormality does not occur.

In the communication control method according to claim 7,
Since the broadcast data is retransmitted based on the confirmation of the reception result of the broadcast data, the broadcast data can be reliably transmitted to all the nodes. Further, after the retransmission of the broadcast data, the reception result is confirmed only from both neighbors only for the abnormally received node, and not for the normally received node, so that the increase of traffic can be prevented.

In the communication control method according to claim 8,
Even if one of the nodes adjacent to the node where the anomaly reception occurs cannot notify the anomaly due to some failure, the other node reliably notifies the sending node of the anomaly occurrence via the bidirectional ring path. it can.

In the communication control method according to claim 9,
Even if a node on both sides of a node that has received an error due to some failure on the transmission line cannot notify the error via a bidirectional route of the ring network, it is possible to reliably use one of these routes. The transmission node can be notified of the occurrence of the abnormality to the transmission source node.

In the communication control method according to the tenth aspect, when a node having an abnormal reception occurs, the information is not notified to the transmission source node, only the adjacent node is notified, and the information is broadcast directly from the adjacent node. The data is retransmitted.
Therefore, the broadcast data can be re-received without increasing the traffic on the transmission path.

In the communication control method according to the eleventh aspect, when a node having an abnormal reception occurs, the information is not notified to the first node which is the transmission source and is notified only to the adjacent node. Broadcast data is retransmitted directly. Therefore, without increasing the traffic on the transmission line,
Broadcast data can be received again. Furthermore, since the broadcast data from both adjacent nodes are compared, the validity of the re-received data can be enhanced.

[0034]

First, the first principle of the communication control method of the present invention will be described. 1 and 2 are diagrams for explaining the first principle of the communication control method according to the present invention. FIG. 1 shows a procedure for transmitting broadcast data and a control signal, and FIG. 2 shows a connection relationship of all nodes in a ring topology network.

In all the following description of the communication control method, the node # 1 becomes the transmitting node and the broadcast data is transmitted to the node # 1.
2, the case of broadcasting to node # 3 and node # 4 is shown. In the first principle of the communication control method according to the present invention, after the broadcast communication, the reception result confirmation of each node is relayed to the one-way adjacent node under the control of the transmission source. The communication procedure of the first principle of the communication control method according to the present invention will be described below with reference to FIGS. 1 and 2. The following step numbers correspond to the step numbers shown in each drawing.

Step: Node # 1 is connected to node # 2,
Broadcast communication of broadcast data is performed to the nodes # 3 and # 4. Step: The node # 1 issues the frame of the result confirmation command only to the node # 2.

Step: When the result confirmation command is received, the node # 2 registers the reception result of the broadcast data in the same frame and notifies the node # 3 as a result notification frame. Step: Upon receiving the result notification from the node # 2, the node # 3 registers the reception result of the broadcast data in the same frame and notifies the node # 4 as a result notification.

Step: When receiving the result notification from the node # 3, the node # 4 registers the reception result of the broadcast data in the same frame and notifies the node # 1 as a result notification. Step: The node # 1 receives the result notification from the node # 4 and determines whether or not the broadcast data has been received by all the destinations.
Alternatively, it is possible to know which node is not receiving normally.

As described above, according to the communication control method of the present invention, after the broadcast communication, the reception result confirmation method uses the node # 1.
Sends the result confirmation command only to the adjacent node # 2. In addition, each node does not return the result notification frame of the reception result to the node # 1 one after another, but after registering the received result notification frame in the received result notification frame, transmits it to the adjacent node by the relay method.

Therefore, the node # 1 can perform other processing without being monopolized in the processing from the transmission of the result confirmation command to the reception of the result notification frame. Further, the time (t) from the node # 1 transmitting the result confirmation command to the node # 2 until confirming the result notifications of all the destination nodes is transmitting the result confirmation command for each node. Compared with the conventional method (polling method, steady monitoring method, etc.) shown in FIG.

Next, a first embodiment of the communication control method of the present invention will be described. FIG. 3 is a diagram for explaining the first embodiment of the communication control method according to the present invention. The communication procedure of the first embodiment of the communication control method according to the present invention will be described below with reference to FIG. The following step numbers correspond to the step numbers shown in each drawing.

Step: Node # 1 is connected to node # 2,
Broadcast communication is performed to the nodes # 3 and # 4. However, in this case, it is assumed that the node # 2 and the node # 4 receive normally, and the node # 3 receives abnormally. Step: The node # 1 issues the frame of the result confirmation command only to the node # 2.

Step: When the result confirmation command is received, the node # 2 registers in the same frame that the broadcast data is normally received, and notifies the node # 3 as a result notification frame. Step: When receiving the result notification from the node # 2, the node # 3 registers the abnormal reception in the same frame and notifies the node # 4 as the result notification.

Step: When receiving the result notification from the node # 3, the node # 4 registers in the same frame that the broadcast data has been normally received, and notifies the node # 1 as the result notification. Step: The node # 1 receives the result notification from the node # 4, and confirms that the broadcast data is normally received by the nodes # 2 and # 4 and abnormally received by the node # 3.

As described above, in the first embodiment of the communication control method according to the present invention, the reception result confirmation time (t) can be shortened as compared with the conventional method, as described in the first principle. In addition, since the information of the abnormally received node is registered in the result notification frame, it is possible to easily confirm which node is not normally receiving.

In the first embodiment of the communication control method described above, as the frame for the result confirmation command and the result notification,
The following frame configuration example can be used. Hereinafter, some frame configuration examples will be described with reference to FIGS. 4 to 6. FIG. 4 shows an example of the configuration of the result confirmation / notification frame. The result confirmation / notification frame shown in FIG.
It includes a result confirmation code, a command / response code, a transmission destination, a transmission source, the number of nodes, and reception result information. The result confirmation code indicates that this frame is a result confirmation frame, and the command / response code indicates whether this frame is a command or a response. The reception result information indicates the reception result of each node, and when the result confirmation / notification frame is configured at the transmission source, fixed information areas for the number of nodes that have broadcasted are added for the reception result information.

When the result confirmation frame is transmitted from node # 1 to node # 2 after the broadcast communication (step), in the result confirmation frame, the command / response code is set to the command and the transmission destination is node # 2. Set to 2,
The node information is set to all zero, for example.

When the result confirmation frame is received at node # 2, if the command / response code is set in the response and the broadcast data is normally received, node # 2
The reception result information of is set to all zeros. This result confirmation frame is transmitted to the node # 3 as a result notification frame.

When node # 3 receives the result notification frame from node # 2, the reception result of the broadcast data of node # 3 is registered in the frame. In the above example, the code of abnormal reception (checksum mismatch) is registered in the reception result information of node # 3. This result notification frame is then transmitted to node # 4.

Similarly, the reception result of the broadcast data is registered in the node # 4, and the result notification frame in which the reception results of all the nodes that have been broadcast are registered is the destination node ##.
Returned to 1. By analyzing the reception result information of each node, the node # 1 can grasp the node that could not be normally received and its cause. Therefore, it is possible to shorten the problem / cause separation time at the time of maintenance or failure. In addition, it is possible to automatically change the operation state by using the content of the information in the frame or to incorporate fail-safe processing, etc., and it is possible to easily add a value-added function of quality improvement.

FIG. 5 shows another example of the result confirmation / notification frame. The result confirmation / notification frame shown in FIG. 5 has a result confirmation code, a command / response code, a transmission destination, and a transmission source, similarly to the frame shown in FIG. However, the result confirmation / notification frame shown in FIG. 5 does not have the reception result information, and the number of the node in which the broadcast data is abnormally received is added during the transfer of the frame to each node. No processing is performed at the node that normally receives the broadcast data.

Further, by setting the number of abnormal reception nodes before the abnormal reception node number, it is possible to grasp how many node numbers are registered thereafter. The number of abnormal reception nodes is incremented each time there is an abnormal reception node, and is cleared when the result notification frame is returned to the transmission source node. In this example, the frame configuration can be shortened when there are few abnormally receiving nodes.

In the frame structure described above, it is not necessary to secure the area of the reception result information for all the nodes, so that the node that has abnormally received the broadcast data can be known efficiently.
FIG. 6 shows another configuration example of the result confirmation / notification frame. The result confirmation / notification frame shown in FIG. 6 corresponds to the opposite case of the frame shown in FIG. That is, in the result confirmation / notification frame shown in FIG. 6, the number of the node that normally receives the broadcast data is added while the frame is transferred to each node. No processing is performed on the node that has abnormally received the broadcast data. That is, when the result notification frame is received by the transmission source, it can be seen that the node having the node number not added in the frame has failed to receive.

By setting the number of normal reception nodes before the number of normal reception nodes, it is possible to grasp how many node numbers are registered thereafter. The number of normal reception nodes is incremented every time a normal reception node is present, and is cleared when the result notification frame is returned to the transmission source node.

In the frame structure described above, it is not necessary to secure the area of the reception result information for all the nodes, so that the node that has abnormally received the broadcast data can be efficiently known.
Next, a second embodiment of the communication control method of the present invention will be described. FIG. 7 is a diagram for explaining the second embodiment of the communication control method according to the present invention.

The communication procedure of the second embodiment of the communication control method according to the present invention will be described below with reference to FIG. The following step numbers correspond to the step numbers shown in each drawing. Step: Node # 1, node # 2, node # 3,
And broadcast to node # 4. However, in this case,
It is assumed that the node # 3 receives the result confirmation / notification frame while the load is increased due to other factors during the reception / processing of the broadcast data and the processing is delayed.

Step: Node # 1 issues a frame of the result confirmation command only to node # 2. Step: When the result confirmation command is received, the node # 2 registers in the same frame that the broadcast data is normally received, and notifies the node # 3 as a result notification frame.

Step: The node # 3 transmits a resend request to the adjacent node # 2 when the broadcast data is being processed. Step: The node # 2 confirms the result again after a lapse of a fixed time (t) after receiving the retransmission request from the node # 3.
The notification frame is transmitted to node # 3.

The subsequent steps are the same as in the first embodiment shown in FIG. As described above, in the second embodiment of the communication control method according to the present invention, while the reception result is being confirmed, the reception result confirmation can be redone at the adjacent node even if the processing of the broadcast data is delayed at the node on the way. it can. Since this reception result confirmation uses only the transmission path to the adjacent node, the confirmation time can be shortened and the result confirmation can be re-received without increasing the traffic. As a result, the reception result can be efficiently confirmed.

Next, a third embodiment of the communication control method of the present invention will be described. FIG. 8 is a diagram for explaining the third embodiment of the communication control method according to the present invention. The communication procedure of the third embodiment of the communication control method according to the present invention will be described below with reference to FIG. The following step numbers correspond to the step numbers shown in each drawing. In addition, in the network configuration of the communication control method according to the present invention, it is assumed that a plurality of nodes are connected to two ring-shaped networks in mutually opposite directions.

Step: Node # 1 changes to node # 2,
Broadcast communication is performed to the nodes # 3 and # 4. However, in this case, it is assumed that a transmission line disconnection failure occurs between the nodes # 2 and # 3. Step: The node # 1 issues the frame of the result confirmation command only to the node # 2. (However, this step is not essential.) Step: When the node # 2 receives the result confirmation command and detects the failure of the transmission line disconnection with the node # 3, the reception result at the node # 2. Only the information is registered in the frame, and the result notification frame is returned to the node # 1.

Step: If the result notification frame does not come within a fixed time, the node # 3 creates a result notification frame by itself, and after registering the reception result information at the node # 3, transmits it to the node # 4. To do. Step: When receiving the result notification frame from the node # 3, the node # 4 registers the reception result information of its own station in the same frame and notifies the node # 1 as a result notification.

Step: The node # 1 receives the result notification from the node # 2 and the result notification from the node # 3,
Check the reception results of all nodes. As described above, in the third embodiment of the communication control method according to the present invention, even if a failure of the transmission path occurs in the middle of the ring network, the nodes of the both sides send back the frame of the reception result to the sending node. To be done. Therefore, even if a failure of the transmission path occurs, the transmission source node can surely confirm the reception results of all the nodes.

Next, the second principle of the communication control method of the present invention will be described. FIG. 9 is a diagram for explaining the second principle of the communication control method according to the present invention. According to the second principle of the communication control method according to the present invention, after the broadcast communication, the reception result confirmation of each node is performed only from each node to the nodes on both sides thereof. Only when there is an abnormal reception in this confirmation, the sender is notified.

The communication procedure of the second principle of the communication control method according to the present invention will be described below with reference to FIG. The following step numbers correspond to the step numbers shown in each drawing. In addition, in the network configuration of the communication control method according to the present invention, it is assumed that a plurality of nodes are connected to two ring-shaped networks in mutually opposite directions.

Step: Node # 1 changes to node # 2,
Broadcast communication of broadcast data is performed to the nodes # 3 and # 4. Step: After a certain period of time, the node # 1 issues a result confirmation command frame to the nodes # 2 and # 4. The node # 2 and the node # 4 register the reception result information in each node in the result notification frame and register the node # 1
Return to.

Step: Node # 2 issues a result confirmation command frame to nodes # 3 and # 1. The nodes # 3 and # 1 register the reception result information in each node in the result notification frame and return it to the node # 2. Step: The node # 3 issues a frame of the result confirmation command to the nodes # 4 and # 2. Node # 4
And the node # 2 registers the reception result information in each node in the result notification frame and returns it to the node # 3.

Step: Node # 4 issues a result confirmation command frame to nodes # 1 and # 3. The nodes # 1 and # 3 register the reception result information in each node in the result notification frame and return it to the node # 4. In the above communication control method, if all the nodes normally receive the broadcast data, no information is returned to the transmission source node # 1. Therefore, this causes node # 1 to
It can be confirmed that there was no abnormal reception. When there are few abnormal reception nodes, it is possible to prevent an increase in traffic. Furthermore, the time required to confirm whether or not the broadcast data could be transmitted to all the nodes is
It can be shortened compared to the conventional method.

On the other hand, when there are many abnormal reception nodes, the reception result can be confirmed by both sides, so that the confirmation can be performed accurately and the quality of communication control can be improved. in this way,
Even if control is not performed from the node # 1, each node autonomously confirms the reception result, so that the reception results of all the nodes can be efficiently confirmed.

Next, a fourth embodiment based on the second principle of the communication control method of the present invention will be described. FIG. 10 is a diagram for explaining the fourth embodiment of the communication control method according to the present invention. The communication procedure of the fourth embodiment of the communication control method according to the present invention will be described below with reference to FIG. The following step numbers correspond to the step numbers shown in each drawing. In the network configuration of the communication control method according to the present invention, it is assumed that a plurality of nodes are connected to two ring-shaped networks in opposite directions.

Step: If node # 1 is node # 2,
Broadcast communication of broadcast data is performed to the nodes # 3 and # 4. However, in this case, node # 2 and node # 4
Then, it is assumed that the reception is normal and the node # 3 receives the abnormality. Step: After a certain period of time, the node # 1 issues a result confirmation command frame to the nodes # 2 and # 4. The nodes # 2 and # 4 register the reception result information (normal reception) in each node in the result notification frame and return it to the node # 1.

Step: Node # 2 issues a result confirmation command frame to nodes # 3 and # 1. The node # 3 registers the reception result information (abnormal reception) in the node # 3 in the result notification frame,
2, the node # 1 registers the reception result information in the node # 1 (in this case, for example, “non-target” and data is set) in the result notification frame, and returns it to the node # 2.

Step: Node # 3 issues a result confirmation command frame to nodes # 4 and # 2. The nodes # 4 and # 2 register the reception result information (normal reception) in each node in the result notification frame and return it to the node # 3. Step: The node # 4 issues a frame of the result confirmation command to the nodes # 1 and # 3. Node # 1
Registers the reception result information at the node # 1 (in this case, for example, sets data as “non-target”) in the result notification frame and returns it to the node # 4. The node # 3 receives at the node # 3. The result information (abnormal reception) is registered in the result notification frame and returned to the node # 4.

Step: Node # 2 and Node # 4
Notifies the node # 1 of the reception abnormality of the node # 3, because the reception result information from the node # 3 is abnormal reception. In the above communication control method, when there is a reception abnormal node in the reception result confirmation of the broadcast data, the node number is notified from the adjacent node to the transmission source node # 1. On the contrary, if all the nodes normally receive the broadcast data, no information is returned to the node # 1 which is the transmission source. Therefore, it is possible to prevent unnecessary frames from being transmitted even if the reception abnormality does not occur.

Next, a fifth embodiment based on the second principle of the communication control method of the present invention will be described. FIG. 11 is a diagram for explaining the fifth embodiment of the communication control method according to the present invention.

The fifth embodiment of the communication control method according to the present invention is the fourth embodiment shown in FIG. 10 to which a procedure for retransmitting broadcast data is added. The communication procedure of the fifth embodiment of the communication control method according to the present invention will be described below with reference to FIG. The following step numbers correspond to the step numbers shown in each drawing. In the network configuration of the communication control method according to the present invention, it is assumed that a plurality of nodes are connected to two ring-shaped networks in opposite directions.

Step-step: The same as the step-step of the fourth embodiment shown in FIG. 10 described above. Step: Node # 1, node # 2, node # 3,
Then, the broadcast communication of the broadcast data is performed again to the node # 4. However, in this case, the node which has normally received in the previous broadcast communication does not receive the broadcast data of this time. Alternatively, it is discarded even if received.

Step: The node # 2 and the node # 4 on both sides of the node # 3 which has received the abnormality receive the node # 3.
Confirm the reception result of the broadcast data retransmitted only to. In the above communication control method, since the broadcast data is retransmitted based on the confirmation of the reception result of the broadcast data, the broadcast data can be reliably transmitted to all the nodes. Further, after the retransmission of the broadcast data, the reception result is confirmed only from both neighbors only for the abnormally received node, and not for the normally received node, so that the increase of traffic can be prevented.

The following two examples can be considered regarding the method of discarding the retransmitted broadcast data in the node which has normally received, which is shown in the step of the communication control method. In the first example, the time at which the broadcast data is transmitted is registered as a time stamp in advance in the broadcast data. Next, when a reception abnormality occurs, the time stamp of the broadcast data that has failed to be received is registered in the result notification frame from the adjacent node that notifies the occurrence of the reception abnormality. When the source node receives the result notification frame, the broadcast data sent at the time indicated by the time stamp is regenerated and retransmitted.

When retransmitting, the time stamp of the broadcast data is set to the time stamp when the broadcast data was first transmitted. Then, the node that normally receives the first broadcast data recognizes that the broadcast data has already been normally received if the time stamps match, and discards the retransmitted broadcast data.

In the second example, when a reception abnormality occurs, a checksum value is set in the result notification frame from the adjacent node which notifies the occurrence of the reception abnormality. When the source node receives the result notification frame, the history of the previously transmitted broadcast data according to the checksum value is retained several times, and the matched broadcast data is retransmitted. At each node,
If the history of the checksum value is referenced and normal reception is performed, the retransmitted broadcast data is discarded.

Table 1 shows an example of a management table of transmitted / received broadcast data held by each node.

[0083]

[Table 1]

The broadcast data retransmitted from the transmitting node is performed by using the time stamp or checksum value of this table. Next, a sixth embodiment based on the second principle of the communication control method of the present invention will be described.
FIG. 12 is a diagram for explaining the sixth embodiment of the communication control method according to the present invention. FIG. 12 shows the network configuration of the communication control method according to the present invention. In this network configuration, a plurality of nodes are connected to two ring-shaped networks in mutually opposite directions. Further, for convenience of explanation, nodes # 5 and # 6 are further connected to this network.

This communication control method has the same basic procedure as that of the fourth embodiment shown in FIG. That is, node # 3
When an abnormal reception of the broadcast data occurs, the result notification frame indicating that the abnormal reception of the node # 3 is transmitted to the node # 1 from the adjacent nodes, the nodes # 2 and # 4. Then, the node # 1 confirms that the contents of the result notification frames from the node # 2 and the node # 4 match, and recognizes that the node # 3 has abnormally received.

However, due to some failure, node # 2
May not be able to send the result notification frame to node # 1. Therefore, in the present communication control method, when the result notification frame indicating that node # 3 is abnormally received is transmitted from node # 2 and node # 4 to node # 1,
2 and node # 4 each send a result notification frame to node # 1 via each of two ring-shaped networks in opposite directions.

Even if the node # 1 cannot receive the result notification frame from one node (in this case, the node # 2), the result notification frame is transmitted from the other node through the two ring networks in the opposite direction. When the is received, the sequence for resending the broadcast data is started.

According to this communication control method, even if one of the nodes on both sides of the node where the abnormality is received cannot notify the abnormality due to some kind of failure, the other node can surely notify the transmitting node via the two routes. Can notify the occurrence of an abnormality. This is effective in preventing failures that cannot be notified due to a node failure and do not shift to the abnormal sequence.

Next, a seventh embodiment based on the second principle of the communication control method of the present invention will be described. FIG. 13 is a diagram for explaining the seventh embodiment of the communication control method according to the present invention. Similar to FIG. 12, FIG. 13 shows a network configuration of the communication control method according to the present invention. In this network configuration, a plurality of nodes are connected to two ring-shaped networks in mutually opposite directions. Further, for convenience of explanation, nodes # 5 and # 6 are further connected to this network.

This communication control method also has the same basic procedure as that of the fourth embodiment shown in FIG. That is, node # 3
When an abnormal reception of the broadcast data occurs, the result notification frame indicating that the abnormal reception of the node # 3 is transmitted to the node # 1 from the adjacent nodes, the nodes # 2 and # 4. Then, the node # 1 confirms that the contents of the result notification frames from the node # 2 and the node # 4 match, and recognizes that the node # 3 has abnormally received.

From node # 2 and node # 4, node #
When a result notification frame indicating that node # 3 has abnormally received is transmitted to node # 1, node # 1 is transmitted from node # 2 and node # 4 to node # 1 via two ring-shaped networks in mutually opposite directions. .

However, due to some failure on the transmission path (for example, disconnection of the transmission path), both node # 2 and node # 4
The result notification frame transmitted to the one-way ring network may not reach the node # 1. Therefore,
In this communication control method, from node # 2 and node # 4,
When the result notification frame indicating that node # 3 has abnormally received is transmitted to node # 1, even if the result notification frame from one direction cannot be received, the result notification of node # 2 and node # 4 from the other direction is sent. When the frame is received, the sequence for resending the broadcast data is started.

According to this communication control method, even if a node on both sides of a node on which an abnormal reception occurs due to some failure on the transmission line cannot notify the abnormality on the bidirectional routes of the two ring-shaped networks, those routes can be It is possible to reliably notify the transmission source node of the occurrence of the abnormality to the transmission source node via either one of the routes. This is effective in preventing a failure in which notification cannot be made due to an abnormality in the transmission line and the abnormal sequence does not occur.

Next, an eighth embodiment based on the second principle of the communication control method of the present invention will be described. FIG. 14 is a diagram for explaining the eighth embodiment of the communication control method according to the present invention. The eighth embodiment of the communication control method according to the present invention is a modification of the fifth embodiment shown in FIG. In particular, in the eighth embodiment, when an abnormal reception of the broadcast data occurs, the information is not notified to the transmission source node, and the broadcast data is retransmitted directly from the adjacent node.

The communication procedure of the eighth embodiment of the communication control method according to the present invention will be described below with reference to FIG. In addition,
The following step numbers correspond to the step numbers shown in each drawing. In the network configuration of the communication control method according to the present invention, it is assumed that a plurality of nodes are connected to two ring-shaped networks in opposite directions.

Step: Node # 1 changes to node # 2,
Broadcast communication of broadcast data is performed to the nodes # 3 and # 4. However, in this case, node # 2 and node # 4
Then, it is assumed that the reception is normal and the node # 3 receives the abnormality. Step: After a certain period of time, the node # 1 issues a result confirmation command frame to the nodes # 2 and # 4. The nodes # 2 and # 4 register the reception result information (normal reception) in each node in the result notification frame and return it to the node # 1.

Step: Node # 2 issues a result confirmation command frame to nodes # 3 and # 1. The node # 3 registers the reception result information (abnormal reception) in the node # 3 in the result notification frame,
2, the node # 1 registers the reception result information in the node # 1 (in this case, for example, “non-target” and data is set) in the result notification frame, and returns it to the node # 2.

Step: When the node # 2 receives the reception result information (abnormal reception) from the node # 3, the node # 2 generates broadcast data and retransmits it to the node # 3. Step: The node # 3 issues a frame of the result confirmation command to the nodes # 4 and # 2. Node # 4
And the node # 2 registers the reception result information (normal reception) in each node in the result notification frame and returns it to the node # 3.

Step: Node # 4 issues a result confirmation command frame to nodes # 1 and # 3. The node # 1 registers the reception result information at the node # 1 (in this case, for example, “non-target” and data is set) in the result notification frame and returns it to the node # 4. The reception result information (abnormal reception) in 3 is registered in the result notification frame and returned to the node # 4.

Step: When node # 4 receives the reception result information (abnormal reception) from node # 3, node # 4 generates broadcast data and retransmits it to node # 3. In the communication control method described above, when a node having a reception abnormality occurs, the information is not notified to the transmission source node, only the adjacent node is notified, and the broadcast data is retransmitted directly from the adjacent node. Therefore, the broadcast data can be re-received without increasing the traffic on the transmission path.

Next, a ninth embodiment based on the second principle of the communication control method of the present invention will be described. FIG. 15 is a diagram for explaining the ninth embodiment of the communication control method according to the present invention. The ninth embodiment of the communication control method according to the present invention is a modification of the eighth embodiment shown in FIG. In particular, the ninth embodiment has the same operation up to the step of the eighth embodiment shown in FIG. In the ninth embodiment, further, when the broadcast data is retransmitted from the adjacent node and the broadcast data do not match, the broadcast data is retransmitted from the transmitting node.

The communication procedure of the ninth embodiment of the communication control method according to the present invention will be described below with reference to FIG. In addition,
The following step numbers correspond to the step numbers shown in each drawing. In the network configuration of the communication control method according to the present invention, it is assumed that a plurality of nodes are connected to two ring-shaped networks in opposite directions.

Step-step: The same as step-step of the eighth embodiment shown in FIG. Step: In the node # 3, the contents of the broadcast data retransmitted from the node # 2 in the step are compared with the broadcast data retransmitted from the node # 4 in the step.
If the contents match, the broadcast data is received. However, if the contents do not match, a resend request is made to node # 1 which is the transmitting node.

Step: When the retransmission request of the broadcast data is received from the node # 3, the broadcast data is retransmitted to each node. At this time, the node normally received in the previous broadcast communication does not accept the current broadcast data. Alternatively, it is discarded even if received. As this discarding method, the same method as that described in the fifth embodiment of the communication control method of the present invention can be applied. That is, in checking the broadcast data retransmitted from the nodes on both sides, it is possible to compare the validity by using the table of Table 1.

In the communication control method described above, when a node with abnormal reception occurs, the information is not notified to the transmission source node, only the adjacent node is notified, and the broadcast data is retransmitted directly from the adjacent node. It Therefore, the broadcast data can be re-received without increasing the traffic on the transmission path. Furthermore, since the broadcast data from both adjacent nodes are compared, the validity of the re-received data can be enhanced.

The embodiment of the present invention has been described above.
It is needless to say that the present invention is not limited to these examples and that improvements and modifications can be made within the scope of the present invention.

[0107]

As described above, the present invention has the following effects. In the communication control method according to the first aspect, after the broadcast communication, the first node transmits the reception result confirmation / notification frame only to the adjacent node. In addition, each node does not sequentially return the result notification frame of the reception result to the node, but transmits it to the adjacent node by the relay method.

Therefore, the first node confirms the reception result
During the period from the sending of the notification frame to the reception of the same frame, other processing can be performed without monopolizing the processing. Further, the time (t) from the first node transmitting the reception result confirmation / notification frame to the adjacent node to confirming the result notification of all the destination nodes is
This can be greatly shortened compared to the conventional method (polling method, steady monitoring method, etc.) in which a result confirmation command is sent for each node.

In the communication control method according to claim 2,
The confirmation time (t) of the reception result can be shortened as compared with the conventional method, and the information of the node which has received an error can confirm the reception result.
Since it is registered in the notification frame, it is possible to easily confirm which node is not receiving normally.

By analyzing the reception result information of each node, the first node can grasp the node which could not be normally received and the cause thereof. Therefore, it is possible to shorten the problem / cause separation time at the time of maintenance or failure. In addition, it is possible to automatically change the operation state by using the content of the information in the frame or to incorporate fail-safe processing, etc., and it is possible to easily add a value-added function of quality improvement.

In the communication control method according to claim 3,
While the reception result is being confirmed, even if the processing of the broadcast data is delayed at the node on the way, the reception result can be confirmed again at the adjacent node. Since this reception result confirmation uses only the transmission path to the adjacent node, the confirmation time can be shortened and the result confirmation can be re-received without increasing the traffic. As a result, the reception result can be efficiently confirmed.

In the communication control method according to claim 4,
Even if a failure of the transmission path occurs in the middle of the ring network, the nodes on both sides of the ring return the frame of the reception result to the transmitting node. Therefore, even if a failure of the transmission path occurs, the transmission source node can surely confirm the reception results of all the nodes.

In the communication control method according to claim 5,
If all nodes normally receive the broadcast data, no information is returned to the first node that is the transmission source. Therefore, from this, the first node can confirm that there was no abnormal reception. If there are few abnormal reception nodes,
It is possible to prevent an increase in traffic. Furthermore, the time required to confirm whether or not the broadcast data could be transmitted to all nodes is
When there are few abnormal reception nodes, it can be shortened compared to the conventional method.

On the other hand, when there are many abnormal reception nodes, the reception result can be confirmed by both sides, so that the confirmation can be performed accurately and the quality of communication control can be improved. in this way,
Even if it is not controlled by the first node, each node autonomously confirms the reception result, so that it is possible to efficiently confirm the reception result of all the nodes.

In the communication control method according to claim 6,
In the reception result confirmation of the broadcast data, if there is a node with abnormal reception, the node number is notified from the adjacent node to the first node which is the transmission source. On the contrary, if all the nodes normally receive the broadcast data, no information is returned to the first node which is the transmission source. Therefore, it is possible to prevent unnecessary frames from being transmitted even if the reception abnormality does not occur.

In the communication control method according to claim 7,
Since the broadcast data is retransmitted based on the confirmation of the reception result of the broadcast data, the broadcast data can be reliably transmitted to all the nodes. Further, after the retransmission of the broadcast data, the reception result is confirmed only from both neighbors only for the abnormally received node, and not for the normally received node, so that the increase of traffic can be prevented.

In the communication control method according to claim 8,
Even if one of the nodes adjacent to the node where the anomaly reception occurs cannot notify the anomaly due to some failure, the other node reliably notifies the sending node of the anomaly occurrence via the bidirectional ring path. it can.

In the communication control method according to claim 9,
Even if a node on both sides of a node that has received an error due to some failure on the transmission line cannot notify the error via a bidirectional route of the ring network, it is possible to reliably use one of these routes. The transmission node can be notified of the occurrence of the abnormality to the transmission source node.

In the communication control method according to the tenth aspect, when a node having an abnormal reception occurs, the information is not notified to the transmission source node but is notified only to the adjacent node, and the information is directly broadcast from the adjacent node. The data is retransmitted.
Therefore, the broadcast data can be re-received without increasing the traffic on the transmission path.

In the communication control method according to the eleventh aspect, when a node having an abnormal reception occurs, the information is not notified to the first node which is the transmission source, and is notified only to the adjacent node. Broadcast data is retransmitted directly. Therefore, without increasing the traffic on the transmission line,
Broadcast data can be received again. Furthermore, since the broadcast data from both adjacent nodes are compared, the validity of the re-received data can be enhanced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a first principle of a communication control method according to the present invention.

FIG. 2 is a diagram for explaining the first principle of the communication control method according to the present invention.

FIG. 3 is a diagram illustrating a first embodiment of a communication control method according to the present invention.

FIG. 4 is a configuration example of a result confirmation / notification frame.

[Fig. 5] Example of configuration of result confirmation / notification frame

FIG. 6 is a structural example of a result confirmation / notification frame

FIG. 7 is a diagram illustrating a second embodiment of the communication control method according to the present invention.

FIG. 8 is a diagram for explaining a third embodiment of the communication control method according to the present invention.

FIG. 9 is a diagram for explaining the second principle of the communication control method according to the present invention.

FIG. 10 is a diagram for explaining a fourth embodiment of the communication control method according to the present invention.

FIG. 11 is a diagram for explaining a fifth embodiment of the communication control method according to the present invention.

FIG. 12 is a diagram for explaining a sixth embodiment of the communication control method according to the present invention.

FIG. 13 is a diagram for explaining a seventh embodiment of the communication control method according to the present invention.

FIG. 14 is a diagram for explaining an eighth embodiment of the communication control method according to the present invention.

FIG. 15 is a diagram for explaining a ninth embodiment of the communication control method according to the present invention.

FIG. 16 shows an example of the configuration of a local area network.

FIG. 17 is a diagram illustrating a conventional communication control method in broadcast communication.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hisaaki Nakajima 3-9-18 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Fujitsu Communication Systems Ltd. (72) Kazuhiko Aoki, Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa No. 9-18 Fujitsu Communication Systems Limited

Claims (11)

[Claims] 1. A communication control method in a ring topology communication network, comprising: (a) transmitting broadcast data from a first node connected to the communication network to a plurality of nodes; and (b) transmitting the broadcast data. A reception result confirmation / notification frame for confirming the reception result of the data is transmitted from the first node to the plurality of nodes by a relay method,
(C) The reception result confirmation / notification frame that has passed through the plurality of nodes after making one round of the communication network,
A communication control method comprising the steps of receiving at the first node. 2. The step (b) comprises: (b-1) the reception result of the second node in the reception result confirmation / notification frame in the second node which cannot normally receive the broadcast data. Registering information, wherein the step (c) includes (c-1) analyzing the reception result information of the reception result confirmation / notification frame which has gone around the communication network in the first node. The communication control method according to claim 1, further comprising the step of obtaining a reception result of the broadcast data. 3. The step (b) includes the step (b-2) of confirming the reception result before the reception processing of the broadcast data is not completed.
In the third node which has received the notification frame, the retransmission request is transmitted to the fourth node which has transmitted the reception result confirmation / notification frame to the third node, and (b-3) the fourth node, 3. The communication control method according to claim 1, further comprising each step of transmitting the reception result confirmation / notification frame to the third node after a predetermined time has elapsed after receiving the retransmission request. 4. In the step (b), (b-4) when an abnormality occurs in the communication network, a reception result confirmation / notification frame is sent from each of the nodes adjacent to the location where the abnormality occurs. Transmitting to the first node in the opposite direction to the location where it occurs in a relay manner, and in the step (c-2), in the first node, each of the adjacent nodes is transmitted. 3. The communication control method according to claim 1, further comprising each step of obtaining a reception result of the broadcast data based on the reception result confirmation / notification frame. 5. A communication control method in a communication network of a ring topology having bidirectional ring paths, comprising: (a) broadcast data from one first node connected to the communication network to a plurality of nodes. And (b) at least one of the plurality of nodes includes each step of confirming the reception result of the broadcast data to both adjacent nodes. 6. The step (b) comprises: (b-1) at a node adjacent to the second node that could not normally receive the broadcast data, receives a reception abnormality notification regarding the second node. And (c) further including a step of obtaining a reception result of the broadcast data based on whether or not the reception abnormality notification is received within a predetermined time in the first node. The communication control method according to claim 5, wherein 7. The step (c) comprises: (c-1) retransmitting the broadcast data by the first node when the reception abnormality notification is received by the first node; 2) The communication control method according to claim 6, wherein a node adjacent to the second node includes each step of confirming a reception result of the broadcast data retransmitted only to the second node. 8. The step (b) includes: (b-2) at both nodes adjacent to the second node that could not normally receive the broadcast data, the reception abnormality notification relating to the second node is transmitted to both nodes. The step of performing (c) the first node via the opposite route, wherein the step (c-3) is at least one of the nodes adjacent to the second node in the first node. 7. The communication control method according to claim 6, further comprising the step of obtaining the reception result of the broadcast data by receiving the reception abnormality notification from the above via the bidirectional route. 9. The step (b) comprises: (b-2) at both nodes adjacent to the second node that could not normally receive the broadcast data, the reception abnormality notification relating to the second node is transmitted to both nodes. The step (c) includes: (c-4) in the first node, the reception abnormality notification from nodes adjacent to both sides of the second node. 7. The communication control method according to claim 6, further comprising the step of obtaining a reception result of the broadcast data by receiving at least one of the two-way paths. 10. The method further comprising the step of generating the broadcast data and transmitting it to the second node at a node adjacent to the second node that could not normally receive the broadcast data. The communication control method according to claim 1. 11. (d) In nodes adjacent to both sides of the second node that could not normally receive the broadcast data, the broadcast data is generated and transmitted to the second node, and (e) the second node. The second node further includes the steps of comparing the broadcast data received from the adjacent nodes and requesting retransmission of the broadcast data to the first node if they do not match. Item 5. The communication control method according to Item 5.