Multiplex communications – Channel assignment techniques – Polling
Reexamination Certificate
1998-06-12
2003-01-28
Ngo, Ricky (Department: 2661)
Multiplex communications
Channel assignment techniques
Polling
C370S236000, C370S454000, C370S410000, C370S258000
Reexamination Certificate
active
06512777
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a communication system which is constituted so that plural repeating installations, to which one or more node terminals are connected, are connected via data transmission lines, and in which data are exchanged between the node terminals, between the repeating installations or between the node terminals and repeating installations, and more specifically relates to a communication method and communication system in which, for example, even when data are exchanged between node terminals belonging respectively to different repeating installations, communication data can be transmitted securely to a destination node terminal specified by an originating source node terminal.
2. Description of the Related Art
Conventionally, a communication system, which is constituted so that plural repeating installations, to which one or more node terminals are connected, are connected via data transmission lines and in which data are exchanged between the node terminals, between the repeating installations or between the node terminals and repeating installations, are generally known.
In the above conventional communication system, when communication data are transmitted from an originating source node terminal to a destination node terminal, communication path management generally adopts the central management method using a central management device.
As for the central management method, a central management device connected with a communication system always monitors use/free state of plural data channels owned by respective repeating installations. At this time, when a node terminal connected to a repeating installation generates a transmission request of communication data, accordingly the repeating installation transmits a use request of the data channel to the central management device. Then, the central management device successively searches plural communication paths from the originating source node terminal to the destination node for data channels which are free or can be changed into a free state so as to allocate the searched data channels to the repeating installations which transmitted the use request. As a result, The communication paths from the originating source node terminal to the destination node terminal can be secured, and the 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 communication path management method in the conventional communication system, in the case where data are exchanged between node terminals, for example, every time a node terminal connected with a repeating installation makes a transmission request of communication data, the repeating installation connected to this node terminal transmission a use request of a data channel to the central management device, and accordingly the central management device successively searches plural communication paths from an originating source node terminal to a destination node terminal for data channels which are free or can be changed into the free state, and allocates the searched data channels to the repeating installations transmitting the use request. Since this complicated process should be performed, there arises a problem, which should be solved, such that time required for securing the usable communication paths becomes comparatively long.
SUMMARY OF THE INVENTION
The present invention is devised in view of the above circumstances, and it is an object of the present invention to provide communication method and communication system in which instead of the central management of communication paths between repeating installations using a conventional central managing device, another path information where use/free state of plural channels of repeating installations comprised in communication device received from the repeating installations other than a repeating installation itself and use/free state of channels corresponding to one or more node terminal connected with the repeating installation itself are compared and referred to, path information of input-output data inputted/outputted into/from the repeating installation itself is decided, and allocation of communication channels for the input-output data is managed individually and dispersively so that processing load due to the path management on respective installations is reduced and processing time required for the path management in the repeating installations is shortened, and as a result, even in the case where data are exchanged between node terminals belonging respectively to different repeating installations, the communication data can be transmitted securely from an originating source node terminal to a specified destination node terminal.
It is another object of the present invention to provide a communication method and communication system in which a path request repeating installation requesting transmission of communication data in the plural repeating installations selects definite paths through which the communication data pass based on common free paths between path information of the respective repeating installations, which are obtained by referring to path information containing free state of output side paths of the repeating installations existing within a request path range from an originating source to destination of the communication data, and transmits the definite path information containing the selected paths to the repeating installations existing within the request path range, whereas the respective repeating installations existing within the request path range revise the respective path information based on the received definite path information so that when pass paths for the communication data are secured, the communication procedure is simplified, and as a result, even in the case where data are exchanged between node terminals belonging respective to different repeating installations, the communication data can be transmitted securely from an originating source node terminal to a specified destination node terminal.
In order to solve the above problems, a first aspect of the invention provides a communication method 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, said communication method exchanging data between the node terminals, between the repeating installations or between the node terminals and repeating installations, said communication method comprising the steps of:
comparing and referring, in each repeating installation, to another path information, where use/free state of plural channels of the other repeating installations other than the repeating installation itself is described, comprised in communication data received from the other repeating installations and use/free state of channels corresponding to the one or more node terminals connected with the repeating installation itself; and
deciding, in each repeating installation, path information of input-output data inputted/outputted into/from the repeating installation itself;
whereby each repeating installation individually and dispersively manages allocation of communication channels of the input-output data.
According the first aspect, instead of a central management of communication paths between the repeating installations using a conventional central managing device, in the plural repeating installations, a repeating installation compares and refers to another path information where use/free state of plural channels of the other repeating installations is described comprised in communication data received by the other repeating installations other than the repeating installation itself and use/free state of channels corresponding to the one or more node terminals connected with the repeating installation itself, and decides path information of input-output data inputted/outputted into/from the repeating installation i
Ngo Ricky
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Phan Tri H.
Yazaki -Corporation
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