Multiplex communications – Channel assignment techniques – Polling
Reexamination Certificate
1998-06-08
2001-02-27
Chin, Wellington (Department: 2664)
Multiplex communications
Channel assignment techniques
Polling
C370S475000
Reexamination Certificate
active
06195363
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a transmission right managing method which easily manages transmission rights of respective communication devices and reduces a communication traffic amount required for the management in a communication system in which plural communication devices are connected with a transmission line and communication is performed among the plural communication devices, and relates to the communication system.
2. Description of the Related Art
In Example 1 of a conventional communication system in which plural nodes (communication devices) are connected with a transmission line and communication is performed among the plural nodes, the respective nodes judge as to whether or not transmission is performed in the transmission line, and when judging that the communication is not performed, the respective nodes start transmission of transmission data.
In addition, in Example 2 of a conventional communication system, the respective nodes request transmission of a specific node, and the specific node which received the transmission request prioritizes the plural transmission requests received by the respective nodes and gives a transmission right only to the node with the highest priority, and the transmission is started from the node to which the transmission right is given.
Further, Example 3 of the communication system adopts the token passing method where when the node obtaining the transmission right completes the transmission or does not need transmission, the transmission right is transferred to the next node.
However, in Example 1 of the communication system, when the transmission is started simultaneously from the plural nodes, transmission data from the respective nodes conflict with each other in the transmission line, so there arises a problem such that a countermeasure should be taken against the conflict in order to prevent the transmission data from being destroyed.
In addition, Example 2 of the communication system requires data used for requesting transmission from the respective nodes to the specific node and for authorization of the transmission from the specific node to the respective nodes. For this reason, a communication traffic amount is increased. Moreover, in the case where a transmission request is transmitted simultaneously from the plural nodes to a specific node, the transmission requests of the respective nodes conflict with each other in the transmission line, so there arises a problem such that a countermeasure should be taken against the conflict in order to receive all the transmission requests.
Further, in Example 3 of the communication system adopting token passing method, since a transmission right is given regardless of the priority order of the transmission, there arises a problem such that transmission data which should be transmitted very urgently cannot be transmitted quickly.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a transmission right managing method and communication system which manage transmission rights of respective communication devices easily and reduce a communication traffic amount without the conflict of data.
In order to solve the above problems, the present invention has the following constitution. A first aspect of the present invention provides a transmission right managing method in which communication is performed between plural communication devices connected with a data transmission line and a transmission right communication device with a transmission right in the plural communication devices transmits data to one or more transmission requesting communication devices which request the transmission right in the remaining communication devices, said method comprising the steps of: transmitting a collecting command from the transmission right communication to the transmission request communication devices; adding self addresses to the collecting command in the transmission requesting communication devices, when a transmission request is made, to transmit the collecting command from the transmission requesting communication devices; and receiving in the transmission right communication device the collecting command to which self addresses of all the transmission requesting communication devices making the transmission request were added collectively.
According to the present invention, when the transmission request is made, the transmission requesting communication devices add their self addresses to the collecting command from the transmission right communication device so as to transmit the collecting command, and the transmission right communication device receives the collecting command to which the self addresses of all the transmission requesting communication devices making the transmission request are added collectively.
Namely, all pieces of report information of the transmission requesting communication devices making the transmission request are added collectively to the collecting command, and the transmission right communication device collects the collecting command, so the collecting command can be collected at a small communication traffic amount without conflict of data.
According to a second aspect of the present invention, when the transmission request is made, the transmission requesting communication devices set transmission flags, and only the transmission requesting communication devices which set the transmission flags receive the collecting command. As a result, the collecting time can be shortened.
According to a third aspect of the present invention, report information representing the degree of urgency of a command for one or more transmission requesting functional equipments connected with the transmission requesting communication devices making the transmission request is added to the collecting command. According to a fourth aspect of the present invention, the self addresses are added to the collecting command in an area which is divided per the degree of urgency of the command. According to a fifth aspect of the present invention, requesting contents for the transmission requesting communication devices making the transmission request are added to the collecting command.
According to a sixth aspect of the present invention, the transmission right communication device determines the transmission requesting communication devices to which the transmission right should be given, based on the collected address. As a result, the transmission right of the transmission requesting communication devices can be managed easily, and the invention can cope with an emergency quickly.
According to a seventh aspect of the present invention, the transmission right communication device determines the transmission requesting functional devices to which the transmission right should be given connected with the transmission requesting communication devices, based on the collected addresses. As a result, the transmission right of the transmission requesting functional equipments can be managed easily, and the invention can cope with an emergency quickly.
According to an eighth aspect of the present invention, the transmission right communication device determines the transmission requesting functional equipments to which the transmission right should be given, based on the degree of urgency of the command and priority of the self addresses of the transmission requesting functional equipments. As a result, the transmission right of the transmission requesting functional equipments can be managed easily and the invention can cope with an emergency quickly.
According to a ninth aspect of the present invention, the transmission requesting communication devices add adding information to the received and collecting command successively in a prescribed arrangement. According to a tenth aspect of the present invention, the adding information collected by the transmission right communication device is transmitted to a managing device for managing a path of a communication system. As a result, since the managing de
Chin Wellington
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yao Kwang B.
Yazaki -Corporation
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