Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Reexamination Certificate
1998-06-16
2001-05-29
Vincent, David R. (Department: 2732)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
C370S468000, C370S432000
Reexamination Certificate
active
06240104
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication system which is arranged by connecting plural repeating installations connected with one or more node terminals via a data transmission line and exchange data between the node terminals, between the repeating installations or between the node terminals and repeating installations, more specifically, for example, relates to a communication method and communication system which can securely transmit communication data from an originating source node terminal to a specified destination node terminal without reducing a data transmission amount per unit time.
2. Description of the Related Art
A communication system, which is arranged such that plural repeating installations respectively connected with one or more node terminals are connected with each other via a data transmission line and exchanges data between the node terminals, between the repeating installations or between the node terminals and repeating installations, has been generally known.
In the aforementioned conventional communication system, as communication path management which is used when communication data are transmitted from an originating source node terminal to a destination node terminal, for example, central managing method using a central managing device is generally adopted.
As for the central managing method, the central managing device connected with the communication system always monitors use/free state of plural data channels provided respectively to the repeating installations. At this time, for example, when a certain node terminal connected with a certain repeating installation makes a request of transmission of communication data, accordingly the repeating installation sends use request of data channels to the central managing device. The central managing device successively searches plural communication paths from an originating source node terminal to a destination node terminal for data channels in free state or in free-enabled state, and allocates the searched data channel to the repeating installation sending use request. As a result, communication paths from the originating source node terminal to the destination node terminal are secured, and communication data can be transmitted securely from the originating source node terminal to the destination node terminal along the communication paths.
However, according to the aforementioned central managing method of managing communication paths in the conventional communication system, for example, in the case where data are exchanged between the node terminals, every time a certain node terminal connected with a certain repeating installation make a request of transmission of communication data, the repeating installation connected with this node terminal transmits use request of data channels to the central managing device. Accordingly the central managing device successively searches plural communication paths from the originating node terminal to the destination node terminal for data channels in free state or in free-enabled state, and allocates the searched data channels to the repeating installation which made use request. Since the central managing device should perform such a complicated process, time required for securing the usable communication paths becomes comparatively longer. Therefore, there arises a problem to be solved such that it is difficult to increase a data transmission amount per unit time in the communication system.
SUMMARY OF THE INVENTION
The present invention has been achieved with such points in view. It therefore is an object of the present invention to provide a communication method and communication system which can transmit communication data from an originating source node terminal to a specified destination node terminal securely without reducing a data transmission amount per unit time even in the case where data are exchanged between node terminals belonging respectively to different repeating installations by reducing load due to path management in the respecting repeating installations and by shortening processing time required for the path management in the respective repeating installations.
To achieve the object, a first aspect of the invention provides a communication method which is used in a communication system arranged by connecting plural repeating installations, to which one or more node terminals are connected, via a data transmission line, when data are exchanged between the node terminals, between the repeating installations or between the node terminals and repeating installations, the communication method comprising the steps of:
providing the plural repeating installations with plural subchannels which become paths for communication data received/transmitted from/to the respective repeating installations and path information storage circuit for storing path information relating to paths from an originating source to destination per subchannel;
transmitting, from a repeating installation in the plural repeating installations, which becomes a path request repeating installation when request of transmission of communication data is made to a prescribed destination in one of the repeating installation itself or a node terminal connected with the repeating installation itself, a number of request subchannels which are used occupationally by the communication data to be transmitted to all multiple destination repeating installations existing in paths from the originating source to destination in multiple way; and
referring, in the respective multiple destination repeating installations which received the number of request subchannels from the path request repeating installation, to the received number of request subchannels and the path information stored in the path information storage circuit to manage respective communication paths respectively.
According to the first aspect, the the path request repeating installation transmits a number of request subchannels which are used occupationally by the communication data to be transmitted to all multiple destination repeating installations existing in paths from the originating source to destination in multiple way, whereas the the respective multiple destination repeating installations, which received the number of request subchannels from the path request repeating installation, refer to the received number of request subchannels and the path information stored in the path information storage measure so as to manage respective communication paths respectively. Therefore, load due to the path management in the respective repeating installations is reduced, and processing time required for the path management in the repeating installations is shortened. As a result, for example, in the case where data are exchanged between the node terminals belonging respectively to different repeating installations, the communication data can be transmitted from the originating source node terminal to the specified destination node terminal securely without reducing a data transmission amount per unit time.
A second aspect of the present invention provide a communication method according to claim
1
, further comprising the steps of:
judging, in the respective multiple destination repeating installations which received the number of request subchannels from the path request repeating installation, as to whether or not a requested number of subchannels can be prepared with referring to the received number of request subchannels and the path information stored in the path information storage circuit; and
returning a result of a preparation YES/NO judgment from the respective multiple destination repeating installations to the path request repeating installation.
According to the second aspect, the respective multiple destination repeating installations, which received the number of request subchannels from the path request repeating installation refer to the received number of request subchannels and the path information stored in the path information storage me
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Vincent David R.
Yazaki -Corporation
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