JPH02105758A - Addressing table changing system - Google Patents

Abstract

PURPOSE:To automatically change an addressing table by referring to the history of connection enable signals time-sequentially recorded in a recording means. CONSTITUTION:Nodes N1-N4 respectively incorporating terminals A1-An1, B1-Bn2, C1-Cn3, and D1-Dn4 is provided with a signal controlling section G1 for sending a connection requesting signal or receiving a connection enable signal, and an addressing table management section G2 which stores the history of the connection enable signal received by the section G1 into a table for maintaining history information. Then the identifying information of the nodes N1-N4 after the terminal which transmits the connection enable signal transfers and the history of the connecting enable signal including transmitted date and time are recorded time-sequentially. The addressing table is changed by rewriting the table by referring to the information and history. Therefore, the addressing table can be changed automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for changing an addressing table in a terminal housed in a switching device in a private communication system.

More specifically, the present invention provides a local communication system in which a plurality of switching devices (nodes) are connected to each other by telephone and signal lines (links), in which specific terminals housed in nodes are connected to other terminals. Terminal (hereinafter referred to as called terminal)
When receiving a call, the specific terminal refers to its own addressing table, learns which node accommodates the called terminal, and sends a connection request to the node that is supposed to accommodate the called terminal. The called terminal may actually be relocated from the node where it is supposed to be accommodated to another node, or the call connection to the terminal from the node where it is supposed to be accommodated may be accommodated in another node. (Hereinafter, such terminal relocation and connection destination change will be collectively referred to as terminal movement), and the call was sent from a specific terminal to the node before the terminal movement. If a connection request is transferred from the node before the terminal moved to the node after the terminal moved, and a connection-ready signal is returned from the node after the terminal moves to the specific terminal, the specific terminal will receive the called address in its addressing table. By rewriting the correspondence between a terminal and its accommodating node, it is possible to directly send a connection request from a specific terminal to the node after the terminal has been moved. This is related to the method of changing.

[Conventional technology]

In conventional communication systems configured with multiple nodes, changes to the addressing table due to the relocation of terminals housed in the communication system are performed by maintenance personnel using the maintenance and operation functions provided for each communication system. was. For this reason, we allocate a usable terminal identification number band to each node,
The configuration of an addressing table (for example, a numeric translation table) that determines the location of a terminal in response to a connection request has been configured so that it is not easily affected by the relocation of the terminal. In addition, in communication systems such as this, where there are no restrictions on assigning identification numbers to terminals accommodated in the communication system, there is no addressing table and the location of the terminal is not known to all nodes making up the communication system. It was matching.

[Problem to be solved by the invention]

The above method not only limits the degree of freedom in allocating terminal identification numbers in a communication system composed of multiple nodes, but also
Link capacity between nodes is required to transmit and receive signals for inquiries to all nodes, and personnel for maintenance and operation are required to change the table.

The present invention makes the numbering of terminals accommodated in a communication system independent of the connection form between nodes of the communication system, and utilizes the function of changing the addressing table to change the accommodation position of the terminal, etc. An object of the present invention is to provide an addressing table changing method that enables automatic addressing table changing.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a local communication system in which a plurality of switching devices (nodes) are connected to each other by telephone and signal lines (links), from a specific terminal housed in a node, When attempting to receive a call from another terminal (hereinafter referred to as called terminal), the specific terminal refers to its own addressing table, learns which node the called terminal is accommodated in, and determines which node the called terminal is accommodated in. A connection request is sent to the node where the called terminal is supposed to be located, but the called terminal has actually been moved from the node where it is supposed to be accommodated to another node, or the node where the called terminal is supposed to be accommodated is connected to the terminal. The call connection may be changed to a call connection to a terminal accommodated in another node (hereinafter, such terminal relocation and connection destination change will be collectively referred to as terminal movement), and the call connection may be changed from a specific terminal to a terminal If a connection request sent to the node before the terminal is transferred from the node before the terminal moves to the node after the terminal moves, and the node after the terminal moves returns a connection-ready signal to the specific terminal, this will cause the specified At the terminal, the correspondence between the called terminal and its accommodating node is changed by rewriting the addressing table, and from then on it is possible to directly send a connection request from the specific terminal to the node after the terminal has been moved. for,
In this method of changing the addressing table, the specific terminal has means for chronologically recording the history of the connection permission signal, including the identification information of the node after the terminal moved that sent the connection permission signal, and the date and time of the transmission. Equipped.

[Effect]

When changing its addressing table, the specific terminal automatically changes its addressing table by referring to the history of connectable signals recorded in chronological order by the recording means.

〔Example〕

FIG. 1 is a block diagram showing a communication system for explaining one embodiment of the present invention, and FIG. 1A is a block diagram showing an example of the configuration of node N3 in FIG.

In these figures, N1 to N4 are nodes, A
I to Anl, Bl to Bo3, CI to Cn3 and D
i to Dn4 are terminals accommodated in nodes N1 to H4, respectively, and Ll to H6 are links connecting the nodes. Also, G1 and G2 are H from each node Nl.
The connection control function performed by referring to the addressing table provided in G1 is shown using node N3 as an example. Gl refers to the addressing table R1, which will be described later, in response to a connection request from a terminal, and stores it in R1. G2 is a signal control unit for sending a connection request signal or receiving a connection permission signal to a node that is connected to a node, and G2 stores a history of connection permission signals received by the signal control unit Gl in a table for maintaining history information. This is an addressing table management unit.

FIG. 2 is an explanatory diagram showing an example of an addressing table provided for each terminal from At to Dn4 shown in FIG. HF2 is an area for storing the name of a terminal to which a terminal using RFI makes a connection request, and HF2 is an area for storing the host node name of the terminal stored in the RFI area.

R4 corresponds to RFl in addressing table R1 (
In this example, in the table group provided in (corresponding to Cn3),
R2 is a table that holds the history of connectable signals (connectable signal sending node name, sending time, February day, and day of the week);
F3 is an area that stores the name of the node that sent the connectable signal for each terminal name in the addressing table R1, and HF
4 is the area that stores the reception time, HF5 is the month and day, HF6 is the area that stores the day of the week, Hl is the aggregation table for each time zone, HFI is the area that indicates the hourly time zone, and HF2 is the area that stores the time zone. This area stores the name of each accommodated node. H
2 is a daily aggregation table for -months, HF3 is an area indicating the day, and HF4 is an area for storing the accommodated node name for each day.

H3 is a summary table for each day of the week, and HF5
is an area that indicates the day of the week, and HF6 is an area that stores the host node name for each day of the week.

R5 is a table group corresponding to the connection request destination terminal name D1 in the addressing table R1, and R3 is a history of connection available signals (connection available signal sending node name, sending time, September, day of the week)
H4 is a summary table for each time period, H5 is a summary table for each day of -months, and H6 is a summary table for each day of the week for -weeks.

FIG. 3 shows an example of a signal sequence for communication between terminals in the communication system. In performing communication with reference to the addressing table R1, Sl is from the terminal accommodated in the node N1 to the node S2 is a connection request signal to a terminal accommodated in node N3, and S2 is a signal (connection permission signal) permitting connection of a terminal from node N3 to node N1, which is a terminal supposed to be accommodated in node N3. If the terminal is moving to another node, the connection request signal is transferred from node N3 to that node, and the connection enable signal is sent from that node to node N1.

FIG. 4(a) is a flowchart showing the operation of the signal control unit G1, and FIG. 4(b) is a flowchart showing the operation of the addressing table management unit G2.

Next, the operation of the present invention will be described with reference to FIG. 4, taking as an example the case where addressing table R1 in FIG. 2 is used for terminal Anl and communication is performed with terminal CR3 that is supposed to be accommodated in node N3.

In the atranging table R1 of terminal Anl, terminal C
Information indicating that the accommodating node is N3 is stored as addressing information of n3. Terminal Anl is terminal Cn
When requesting communication with node N1, the signal control unit G of node N1
1 receives the terminal identification number of the terminal Cn3 to which the connection is requested from the terminal (F1), searches the addressing table R1 corresponding to the terminal Anl (F2), and searches for the accommodating node name N3 of the terminal Cn3 listed in the table. and sends out a connection request signal Sl (F3).

Signal control unit G of node N3 that received connection request signal S1
In accordance with this signal, terminal Cn3 determines whether connection is possible with terminal Cn3, and if connection is possible, sends a connection possible signal to node N1. The signal control unit G1 of the node N1, which has received the connectable signal S2, enables the terminal Anl and the terminal Cn3 to communicate, and sends the connectable signal to the addressing table manager G2. In the addressing table management unit G2, JFt [ corresponding to Cn3 of the addressing table R1
The information corresponding to the connectable signal is stored in the storage table R2, and the summary tables H1 and H2H3 are changed (F4).

Next, a method of changing the addressing table R1 will be explained. A communication history storage table R2 provided for each terminal name in the addressing table R1 stores the names of nodes that sent a connectable signal for each terminal name. The addressing table management unit G2 extracts the latest m of the note salts stored in the area of RF3 in the history storage table of R2 (F5), and RF of the addressing table R1.
When the number of node names different from the terminal accommodation node name stored in area 2 exceeds a certain value (F6), the table management unit G2 shown in FIG. 1A stores the terminal accommodation node name of RF2 in the addressing table R1. to that node name (Fl).

Further, the addressing table management unit G2 creates and updates the HIH2 and N3 tables according to the contents of the communication history storage table R2.

The addressing table management unit G2 changes the accommodating node name corresponding to the connection request destination terminal name in the addressing table R1, and also, for example, when a situation occurs in which there is no terminal in the accommodating node stored in the addressing table R1. , In response to an inquiry from the signal control unit C1, the node name that is accommodated in the same time period on the previous day in the time period aggregation table H1 is returned as the node that may accommodate the next terminal. .

Furthermore, even if a connection is made according to the contents of the time period aggregation table H1, if there is no terminal at that node, the daily management table H2 or the day of the week management table H
Referring to the contents of 3, the destination node name is returned to the signal control unit G1.

In other words, since the location of a terminal may change depending on the day, day of the week, or time of day, it is possible to change the addressing table in response to this change.

〔Effect of the invention〕

As explained above, according to the present invention, an addressing table corresponding to a terminal is provided, and the contents of the addressing table are monitored by monitoring the transmission and reception of signals necessary for communication, and further storing the information. Even if the configuration of the communication system is changed, such as relocation of terminals housed in the communication system, maintenance personnel do not need to rewrite the addressing table each time (this improves responsiveness to relocation of terminals and reduces maintenance costs). can be achieved.

Although the embodiment has been described in which an addressing table is provided for each terminal, the same applies to a case where each node has an addressing table. Further, in this embodiment, the communication system composed of a plurality of nodes is described as a complete mesh network, but the same applies to forms such as star type, bus type, loop type, etc.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a communication system for explaining an embodiment of the present invention, FIG. 1A is a block diagram showing an example of the configuration of node N3 in FIG. 1, and FIG. 2 is an addressing system provided for terminals. An explanatory diagram showing an example of a table, FIG. 3 is an explanatory diagram showing an example of a signal sequence between terminals, and FIG.
4A is a flowchart showing the operation of the signal control section G1 in FIG. 1A, and FIG. 4B is a flowchart showing the operation of the addressing table management section G2 in FIG. 1A. Code explanation N1-N4...Node, Ll-L6...Link, G
1...Signal control unit, G2...Addressing table management unit. Agent Patent Attorney Akio Namiki

Claims (1)

[Claims] 1) In a local communication system in which a plurality of switching devices (hereinafter referred to as nodes) are connected to each other by telephone and signal lines (hereinafter referred to as links), When a specific terminal (hereinafter referred to as called terminal) wants to receive a call from another terminal (hereinafter referred to as called terminal), the specific terminal refers to its own addressing table and determines which node the called terminal is accommodated in. However, if the called terminal has actually been relocated from the node that is supposed to be accommodated to another node, or if the called terminal is actually relocated from the node that is supposed to be accommodated, or The call connection to the terminal of the node that was supposed to be located may have been changed to the call connection to the terminal accommodated in another node (hereinafter referred to as
Such terminal relocation and connection destination change are collectively referred to as terminal movement), a connection request sent from a specific terminal to the node before the terminal movement is transferred from the node before the terminal movement to the node after the terminal movement, When a connection ready signal is returned to a specific terminal from the node after the terminal was moved, the specific terminal changes the correspondence between the called terminal and its accommodating node in the addressing table by rewriting it, and then is a method for changing the addressing table to enable a specific terminal to directly send a connection request to a node after the terminal has moved. A method for changing an addressing table, characterized in that a history of connectable signals including node identification information and the date and time of transmission thereof is recorded in chronological order, and rewriting is performed by referring to the recorded data.