JPH02202741A - Network control system - Google Patents

Abstract

PURPOSE:To effectively utilize the network, and also, to improve the reliability by providing a storage means of constitution information, etc., managing synchronously a state of all communication equipments joined in the network by each communication equipment, and inhibiting unnecessary communication. CONSTITUTION:Transmitting data from a communication utilizing device 3 is accumulated in a transmitting data storage means 9, and when a transmission right control means 5 obtains a transmission right, constitution information in a constitution information storage/updating means 6 is referred to, and it is transmitted, when its transmission to the other communication equipment. Also, receiving data to a communication equipment 2 is accumulated in a receiving data storage means 10 through a transmitting/receiving means 4, and thereafter, delivered to the device 3, and the means 5 brings the data quantity which can be accumulated in the receiving data storage means 10 to broadcast communication as receiving flow control information at the time point of broadcast communication of a transmission right transfer. Subsequently, the management of the transmission right in each communication equipment is executed synchronously and independently by each communication equipment by allowing a transmission right pointer for indicating the constitution information of the communication equipment for holding the transmission right to circulate. In such a way, the network can be utilized effectively, and also, the reliability can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a network control method using configuration information in controlling transmission rights in which a plurality of communication devices communicate with each other using the same communication medium. .

[Conventional technology]

2. Description of the Related Art Conventionally, a local area network (hereinafter abbreviated as LAN) is a form in which a plurality of communication devices communicate with each other using the same communication medium.

As a control method for transmission rights in LAN, I.N.I.S.
O/DI 8802/4 (ISO/DI
There is a token-passing bus access method specified in S8802/4).

In this system, control information called a token indicating transmission rights is circulated between communication devices within the LAN.

The communication device that has acquired the token can transmit.

What each communication device stores as configuration information is only information regarding the next communication device to which the token is to be delivered.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not give consideration to the point of constantly grasping the state of the network and managing the configuration, and there is a problem that detection of an abnormality in one communication partner is delayed and data is sent unnecessarily.

The purpose of the present invention is to manage the configuration of all communication devices that join a network, make it easy to understand the operation of each communication device, and control transmission rights, and to suppress unnecessary communication and use the network effectively. The purpose is to provide a network control method.

Another object of the present invention is to provide a highly reliable network control system in which each communication device that joins the network manages the status of other communication devices.

[Means to solve the problem]

In order to achieve the above purpose, each communication device is equipped with means for storing and updating configuration information indicating all communication devices that have joined the network and the order in which they acquire transmission rights, and a means for understanding the operations of other communication devices. It is equipped with communication and time monitoring means.

Furthermore, in order to detect that a new communication device joins, the apparatus is provided with means for causing data transmission to collide, and means for detecting the collision.

Furthermore, in order to grasp the status of all stations joining the network, it is equipped with a means for broadcasting received flow control information and a means for storing and updating the configuration information of each communication device in the aforementioned configuration information. .

[Effect]

Each communication device that has joined the network monitors the transfer of transmission rights according to the configuration information it stores, and checks whether the immediately preceding communication device in the configuration information has transferred the transmission right by broadcast communication or has not communicated within a certain period of time. If the transmission right is removed from the configuration information because there is no data, the transmission right is acquired, and if there is data to be sent and the communication device of the transmission destination is in a state where it can be received according to the configuration information, the data is transmitted, and the reception flow is controlled within a certain period of time. It operates to broadcast transmission rights transfer along with information. Also, the newly joining communication device transmits invalid data, and a collision occurs in the transmission of the stable joining communication device, which operates to reconfigure the configuration information. Furthermore, when data is transmitted, it operates to update reception flow control information regarding the transmission destination communication device in the configuration information of all communication devices. As a result, each communication device that joins the network can always grasp the status of other communication devices, so unnecessary communication can be suppressed and the network can be used effectively.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In the figure, reference numeral 1 indicates a communication medium, which is a bus-type communication path consisting of a coaxial cable or an optical fiber cable. 2゜12.22.
32 is a communication device, which has the internal structure shown in FIG.
Connect the device 3 that uses communication. The numbers in parentheses shown in FIG. 2 indicate the address of each communication device. The communication device has a transmitting/receiving means 4 for transmitting and receiving data to and from the communication medium 1, and the transmitting right controlling means 5 has a function of transmitting and receiving control information to the transmitting right controlling means 5 and the configuration information storage/updating means 6. It provides a data transmitting function to the received data storage means IO, and a data receiving function to the received data storage means IO. The configuration information storage/updating means 6 stores configuration information as shown in FIG. Update. The transmission right control means 8 monitors the communication, detects the departure of another communication device by the time monitoring means 7, and instructs the removal of information regarding the communication device from the configuration information, and the collision detection means 8
detects the new addition of a communication device, instructs update of configuration information, monitors broadcast communication to transfer transmission rights, and controls transmission rights by referring to configuration information. Transmission data from the communication device 3 is stored in the transmission data storage means 9, and when the transmission right control means 5 acquires the transmission right, it refers to the configuration information and transmits it to the other communication device if it is valid. Communication device 2
The received data is stored in the received data storage means 10 through the transmitting/receiving means 4 and delivered to the communication utilization device 3. The transmission right control means 5 broadcasts the amount of data that can be stored in the reception data storage means 10 at the time of transmission right transfer (i) as reception flow control information.

Management of transmission rights in each communication device is performed independently and synchronized in each communication device by having a painter that points to the configuration information of the communication device that holds the transmission right and circulating the pointer as shown in FIG. The figure shows a communication data format for transmission right transfer and data transmission, and the source communication device address uniquely determined from the configuration information and the transmission right transfer destination communication device address are omitted from the communication data.

According to this embodiment, there are effects of effective use of the network and improvement of reliability.

〔Effect of the invention〕

According to the present invention, since the status of all communication devices participating in the network is managed in synchronization with each communication device, unnecessary communication can be suppressed and overhead can be reduced, resulting in effective use of the network.

Further, since the configuration of the network is managed independently for all communication devices, even if a failure occurs in a communication device, the communication device can be disconnected and communication can be continued, which has the effect of improving reliability.

Furthermore, by broadcasting the reception flow control information when transferring the transmission right, depletion of reception resources can be prevented, which has the effect of improving communication quality.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of communication devices constituting a network according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a network according to this embodiment, and FIG. 3 is a diagram of information managed by each communication device according to this embodiment. FIG. 4 is an explanatory diagram showing the transmission right management system of this embodiment, and FIG. 5 is an explanatory diagram showing the communication data format of this embodiment. DESCRIPTION OF SYMBOLS 1... Communication medium, 2.12, 22, 32... Communication device, 3... Communication utilization device, 4... Transmission/reception means, 5... Transmission right control means, 6... Configuration information Storage/updating means, 7... Time monitoring means, 8... Collision detection means. 9... Transmission data storage means, 10... Reception data storage means. Section 7, Section 85, Section 4, Section 2, Section J

Claims (1)

[Claims] 1. In a network control method in which a plurality of communication devices use the same communication medium and control transmission rights to prevent data transmission from colliding, each of the communication devices uses the communication medium. 1. A network control system comprising means for storing configuration information indicating the order in which transmission rights are acquired, and transmitting rights are transferred by broadcast communication.