JP2845903B2 - Addressing table change method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for changing an addressing table in a terminal accommodated in a switching device in a private communication system.

More specifically, the present invention relates to a plurality of switching devices (nodes).
Are connected by a call and a signal line (link) in a private communication system, when a certain terminal accommodated in a certain node does not arrive at another terminal (hereinafter called a called terminal). In this case, the node accommodating the specific terminal refers to the addressing table corresponding to the terminal to know which node the called terminal is accommodated in, and sends a connection request to the node supposed to be accommodated. The call terminal is actually relocated from the supposed node to another node, or the call connection of the supposed node to the terminal is accommodated in another node. For example, the connection of a terminal is changed to a call connection (hereinafter, such relocation of the terminal and the change of the connection destination are collectively referred to as terminal movement). The connection request transmitted from the node before the terminal movement is transferred to the node after the terminal movement, and the connection enable signal is returned from the node after the terminal movement to the node accommodating the specific terminal, whereby the specific terminal is The accommodating node changes the correspondence between the called terminal and the accommodating node in the addressing table by rewriting, and thereafter sends a connection request directly from the node accommodating the specific terminal to the node after the terminal moves. The present invention relates to such a method of changing the addressing table.

[Conventional technology]

In a conventional communication system including a plurality of nodes, a change of an addressing table accompanying a relocation of a terminal accommodated in the communication system is performed by a maintenance person using a maintenance operation function provided for each communication system. I was For this reason, a terminal identification number band that can be used is assigned to each node, and the configuration of an addressing table (for example, a numeric translation table) that determines the location of the terminal in response to a connection request is not easily affected by the relocation of the terminal. Was configured. In a communication system in which there is no restriction on the assignment of terminal identification numbers to be accommodated in such a communication system, all nodes configuring the communication system without an addressing table are asked for the location of the terminal. I was matching.

[Problems to be developed by the invention]

In the above method, not only is the degree of freedom in assigning terminal identification numbers of a communication system composed of a plurality of nodes limited, but also the link capacity between nodes required to transmit and receive signals for inquiries to all nodes is increased. In addition to the above, there is a need for maintenance personnel necessary for changing the table.

The present invention makes the numbering of the terminals accommodated in the communication system independent of the connection mode between the nodes of the communication system and uses the function of changing the addressing table to change the accommodation position of the terminals. An object of the present invention is to provide an addressing table change method which enables automation of the change of the addressing table.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, in a private communication system in which a plurality of switching devices (hereinafter, referred to as nodes) are connected to each other by a call and a signal line (hereinafter, referred to as a link), When an incoming call is received from another accommodated specific terminal to another terminal (hereinafter referred to as a called terminal), the node accommodating the specific terminal refers to an addressing table corresponding to the terminal, and determines which terminal is called. It knows whether it is accommodated in the node, and sends a connection request to the node that is supposed to be accommodated, but the called terminal is actually transferred from the supposed node to another node. Or the connection of the call to the terminal of the node supposed to be accommodated has been changed to the connection of the call to the terminal accommodated in another node (hereinafter, the transfer of the terminal and the connection destination thereof). The connection request sent from the node accommodating the 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, and after the terminal movement. When the connectable signal returns from the node to the node accommodating the specific terminal, the node accommodating the specific terminal rewrites the correspondence between the called terminal and the accommodation node in the addressing table based on the signal. As a change, after the change, in the addressing table changing method for enabling a connection request to be sent directly from the node accommodating the specific terminal to the node after the terminal moves, the specific terminal is accommodated. In the node, the connection information including the identification information of the node after the terminal that has transmitted the connectable signal and the date and time of the transmission is transmitted. Equipped with a means for chronologically recording the history of the signal.

[Action]

At the time of changing the addressing table, the node accommodating the specific terminal automatically changes the addressing table with reference to the history of the connectable signal recorded in time series by the recording means.

〔Example〕

FIG. 1 is a block diagram showing a candy communication system for explaining an embodiment of the present invention, and FIG. 1A is a node in FIG.
FIG. 3 is a block diagram illustrating a configuration example of N1.

In these figures, N1 to N4 are nodes, A1 to An1, B1 to Bn2, C1 to Cn3, and D1 to Dn4 are terminals accommodated in the nodes N1 to N4, respectively, and L1 to L6 are links connecting the nodes. It is. Further, G1 and G2 illustrate the connection control function performed by referring to the addressing table provided in each of the nodes N1 to N4 using the node N1 as an example, and G1 will be described later in response to a connection request from the terminal. G1 is a signal control unit for sending a connection request signal or receiving a connection enable signal to the node stored in R1 by referring to the addressing table R1, and the connection enable signal received by the signal control unit G1. Is an addressing table management unit that stores the history of the history information in a history information maintenance table.

FIG. 2 is an explanatory diagram showing an example of an addressing table provided for each of the terminals A1 to Dn4 shown in FIG.
R1 is an addressing table for managing the connection destination of the terminal, RF1 is an area for storing the name of the terminal making a connection request by the terminal using the table, and RF2 is an accommodation node name of the terminal stored in the area of RF1. Is an area for storing.

R4 is a table group provided for addressing RF1 (corresponding to Cn3 in this example) in the addressing table R1, and R2 is
This table stores the history of connectable signal (connectable signal transmitting node name and transmission time, month, day, day of the week). RF3 is an area that stores the name of the node that transmitted the connectable signal for each terminal name in addressing table R1. RF4 is an area for storing the reception time, RF5 is an area for storing the date, and RF6 is an area for storing the day of the week.
H1 is an aggregation table for each time zone, HF1 is an area indicating an hourly time zone, and HF2 is an area for storing accommodation node names for each time zone. H2 is a daily totaling table in one-month units, HF3 is an area indicating days, and HF4 is an area for storing daily accommodation node names. H3 is an aggregation table for each day of the week, and HF5 is an area indicating the day of the week, H
F6 is an area for storing accommodation node names for each day of the week.

R5 is a group of tables corresponding to the connection request destination terminal name D1 in the addressing table R1, and R3 is a table holding a history of connectable signal (connectable signal transmitting node name and transmission time, month, day, day of the week). , H4 is a tally table for each time zone, H5 is a tally table for each month, and H6 is
It is an aggregation table for each day of the week.

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, S1 is transmitted from a terminal accommodated in the node N1 to a node. This is a connection request signal to the terminal accommodated in N3, and S2 is a signal (connection enable signal) for permitting connection of the terminal from node N3 to node N1. If the terminal that is supposed to be accommodated in the node N3 is moving to another node, the connection request signal is transferred from the node N3 to the node, and a connection enable signal is sent from the node to the node N1. .

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

Next, according to FIG. 4 for the operation of the present invention, the addressing table R1 of FIG.
The following describes an example of communication with the terminal Cn3 that is supposed to be accommodated.

The addressing table R1 corresponding to the terminal An1 has the terminal C
Information that the accommodation node is N3 is stored as the addressing information of n3. When the terminal An1 requests communication with the terminal Cn3, the signal control unit G1 of the node N1 receives the terminal identification number of the connection request destination terminal Cn3 from the terminal (F1),
Search the addressing table R1 corresponding to the terminal An1 (F
2) Send a connection request signal S1 to the accommodation node name N3 of the terminal Cn3 described in the table (F3).

The signal control unit G1 of the node N3 that has received the connection request signal S1
According to this signal, determines whether or not connection with the terminal Cn3,
If connection is possible, a connection enable signal is sent to node N1. The signal control unit G1 of the node N1 that has received the connection enable signal S2
The terminal An1 and the terminal Cn3 can communicate with each other, and sends the connectable signal to the addressing table management unit G2. The addressing table management unit G2 stores information corresponding to the connectable signal in the history storage table R2 corresponding to Cn3 of the addressing table R1, and collects the totalization tables H1, H
2. Change H3 (F4).

Next, a method of changing the addressing table R1 will be described. The communication history storage table R2 provided for the terminal name in the addressing table R1 contains the name of the node that sent the connectable signal for each terminal name. The addressing table management unit G2 extracts the latest m node names among the node names stored in the area of RF3 in the history storage table of R2 (F5), and stores the terminal accommodation nodes stored in the area of RF2 of the addressing table R1. If the number of node names different from the name exceeds a certain value (F6), the table management unit G2 shown in FIG. 1A changes the terminal accommodation node name of RF2 of the addressing table R1 to the node name (F7).

Further, the addressing table management unit G2 creates and updates each table of H1, H2, H3 according to the contents of the communication history storage table R2. Addressing table management unit G2
Changes the accommodation node name corresponding to the connection request destination terminal name of the addressing table R1, and, for example, when a situation occurs in which no terminal is present in the accommodation node stored in the addressing table R1, the signal control unit G1 In response to the inquiry from, the name of the node accommodated in the same time zone of the previous day of the tally table H1 in the time zone is returned as the node that may next accommodate the terminal.

Furthermore, even if connection is made according to the contents of the time table aggregation table H1 and there is no terminal at the node, the accommodation destination node is referred to by referring to the contents of the daily management table H2 or the day of the week management table H3. The name is returned to the signal control unit G1.

In other words, the terminal may change its location depending on the time zone on the day and the day of the week, so that it is possible to change the addressing table in response to this.

〔The invention's effect〕

As described above, according to the present invention, an addressing table corresponding to a terminal is provided in a node, transmission / reception of a signal necessary for performing communication is monitored, and furthermore, the information is stored in the addressing table, thereby enabling communication. Even if the configuration of the communication system is changed, such as relocation of a terminal accommodated in the system, it is not necessary for the maintainer to rewrite the addressing table each time, and responsiveness to the relocation of the terminal and reduction of the holding cost can be achieved.

In this embodiment, the communication system including a plurality of nodes is described as a complete mesh network. However, the same applies to a star type, a bus type, a loop type, and the like.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a communication system for explaining an embodiment of the present invention, and FIG. 1A is a node N3 in FIG.
FIG. 2 is an explanatory diagram showing an example of an addressing table provided for each terminal, FIG. 3 is an explanatory diagram showing an example of a signal sequence between terminals, and FIG. 4 (a).
4 is a flowchart showing the operation of the signal control unit G1 in FIG. 1A, and FIG. 4 (b) is a flowchart showing the operation of the addressing table management unit G2 in FIG. 1A. Description of symbols N1 to N4: nodes, L1 to L6: links, G1: signal control unit, G2
... Addressing table management unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 3/42-3/58 H04M 3/00 H04Q 3/545 H04Q 3/58

Claims (1)

(57) [Claims] 1. A private communication system in which a plurality of switching devices (hereinafter, referred to as nodes) are connected to each other by a telephone call and a signal line (hereinafter, referred to as a link). When an incoming call from a specific terminal to another terminal (hereinafter called a called terminal) is received, the node accommodating the specific terminal refers to the addressing table corresponding to the terminal and determines which node the called terminal is accommodated in. Know
A connection request is sent to the node that is supposed to be accommodated, but the called terminal is actually moved from the node that is supposed to be accommodated to another node, or the node that is supposed to be accommodated. Is changed to a call connection to a terminal accommodated in another node (hereinafter, such a transfer of a terminal and a change of a connection destination are collectively referred to as terminal movement). The connection request sent from the node accommodating the specific terminal to the node before the terminal move is transferred from the node before the terminal move to the node after the terminal move, and a connection enable signal is transmitted from the node after the terminal move to the specific terminal. When returning to the node accommodating the specific terminal, the node accommodating the specific terminal transmits the history of the connectable signal including the identification information of the node after the terminal that transmitted the connectable signal and the date and time of the transmission. Record in a row, refer to the recorded data, rewrite the correspondence between the called terminal and its accommodating node in the addressing table, and thereafter, from the node accommodating the specific terminal to the node after moving the terminal. A method for changing an addressing table, wherein a connection request is sent directly.