Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-02-23
2004-06-08
Duong, Frank (Department: 2666)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S392000
Reexamination Certificate
active
06747982
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication method for use in a communication system constructed by connecting a pair of networks, which are constructed by connecting a plurality of relay units to which one or more than two node terminals are connected respectively via data transfer lines, via a gate way to execute data exchange between the node terminals, the relay terminals, or the node terminal and the relay terminal. More particularly, the present invention relates to a communication method capable of surely transmitting communication data to a destination while remarkably increasing data transmission capability per unit time, a communication system, and a gate way used in this communication system.
2. Description of the Prior Art
In the prior art, as disclosed in Patent Application Publication (KOKAI) 59-62245, for example, a data communication system has been widely known in which a plurality of local area networks (referred to as “LAN's” hereinafter) used to execute data exchange between a plurality of stations are connected via gate ways to enable data exchange between LANs.
According to the technology disclosed in the above Publication, in addition to a transmitter/receiver address for designating the transmitter and the receiver of data respectively, a transmitting or receiving station address indicating the data transmitting or receiving station and a network address indicating the network to which the data transmitting or receiving station belongs have been provided in the transmitter/receiver address of the communication data. Hence, even if data communication is to be carried out beyond its own network, certain data communication between different LAN's has been made possible by referring to these addresses upon data communication.
However, in the above communication system in the prior art, since there has existed a large variety of addresses to be attached to the communication data, an information writing area of relatively large capacity must be prepared as address writing area in the communication data. Therefore, such a problem to be solved has been involved in the prior art that this becomes a barrier upon increasing data transmission capability per unit time.
SUMMARY OF THE INVENTION
The present invention has been made in light of the above circumstances, and it is an object of the present invention to provide a communication method, a communication system, and a gate way used in the communication system, which are capable of transmitting communication data to a destination without fail while increasing remarkably data transmission capability per unit time, by describing previously source/destination addresses in a small amount of address describing area provided in the communication data, then transmitting the communication data, in which the source/destination addresses are described, to a destination by the relay units, then decoding the source/destination addresses included in received communication data by the gate way, then deciding whether or not the source and the destination belong to a same network, by the gate way based on decoded source/destination addresses and attribution identification information stored previously, and then selecting an appropriate route as the destination of the communication data based on a result of attribution decision and then transmitting the communication data to the destination via the selected route by the gate way.
In order to achieve the above object of the present invention, there is provided a communication method for use in a communication system constructed by connecting a pair of networks, which are constructed by connecting a plurality of relay units to which one or more than two node terminals are connected respectively via data transfer lines, via a gate way so as to execute data exchange between the node terminals, the relay units, or the node terminal and the relay unit, the communication method comprising the steps of: describing source/destination addresses previously in an address describing area provided in communication data as transmission object by the relay units; transmitting the communication data, in which the source/destination addresses are described, to a destination by the relay units; decoding the source/destination addresses included in received communication data by the gate way; deciding whether or not a source and the destination belong to a same network, by the gate way based on the decoded source/destination addresses and attribution identification information stored previously; and selecting an appropriate route as the destination of the communication data based on a result of attribution decision and then transmitting the communication data to the destination via the selected route by the gate way.
According to the present invention, first the relay units transmits the communication data, in the address describing area of which the source/destination addresses are described, to the destination. Then the gate way decodes the source/destination addresses included in received communication data, then decides whether or not the source and the destination belong to the same network based on the decoded source/destination addresses and attribution identification information stored previously, then selects the appropriate route as the destination of the communication data based on the result of attribution decision, and then transmits the communication data to the destination via the selected route.
Hence, according to the present invention, the communication data can be transmitted surely to the destination while increasing remarkably data transmission capability per unit time only by describing the source/destination addresses previously in a small amount of the address describing area provided in communication data.
In the preferred embodiment of the present invention, the appropriate route selecting step and the communication data transmitting step by the gate way comprise the steps of: selecting a route for own network, to which the source belongs, as the destination of the communication data by the gate way when it has been decided based on a result of the attribution decision that the source and the destination belong to the same network, and transmitting the communication data to the destination via the selected route for own network by the gate way.
According to this embodiment, when it has been decided based on the result of the attribution decision that the source and the destination belong to the same network, the gate way selects a route for own network, to which the source belongs, as the destination of the communication data, and then transmits the communication data to the destination via the selected route for own network.
In the preferred embodiment of the present invention, the appropriate route selecting step and the communication data transmitting step by the gate way comprise the steps of: selecting a route for other network, to which the source does not belong, as the destination of the communication data by the gate way when it has been decided based on a result of the attribution decision that the source and the destination do not belong to the same network, and transmitting the communication data to the destination via the selected route for other network by the gate way.
According to this embodiment, when it has been decided based on a result of the attribution decision that the source and the destination do not belong to the same network, the gate way selects a route for other network, to which the source does not belong, as the destination of the communication data, and then transmits the communication data to the destination via the selected route for other network.
In order to achieve the above object of the present invention, there is provided a communication method for use in a communication system constructed by connecting a pair of networks, which are constructed by connecting a plurality of relay units to which one or more than two node terminals are connected respectively via data
Duong Frank
Jagannathan Melanie
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Yazaki -Corporation
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