JPH04286447A - Exchange congestion prevention device - Google Patents

Abstract

PURPOSE:To prevent incoming call congestion in advance caused between exchange stations of a communication system such as a telephone exchange network. CONSTITUTION:A dial number entered from a user telephone set is interpreted into a subscriber number representing an incoming call station accommodating a telephone set of a caller by a number interpreter section 11. A simultaneous connection call number limit processing section 12 based on the subscriber number reads a relevant simultaneous connection call upper limit and a connection state call number from a simultaneous connection call upper limit storage section 13 and a connection state call number storage section 14 and compares them. As a result, when the connection state call number is less than the simultaneous connection upper limit, the connection state call number is incremented by one to continue the call connection and when not, the call connection is stopped and it is informed to a caller. Moreover, a post processing section 15 decrements the connection state call number of a relevant subscriber number of the connection state call number storage section 14 by one when the connected call is terminated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic exchanges, and more particularly to an exchange congestion control device that performs control to prevent incoming call congestion between central office exchanges.

0002

2. Description of the Related Art Generally, a communication system such as a telephone switching network accommodates a plurality of terminals as a plurality of central office exchanges, and communicates between them. In such a central office exchange, a large number of call connection requests are made from other central exchanges at the same time, resulting in a so-called congestion state where it becomes impossible to receive calls.

[0003] In order to avoid such a situation, conventionally,
Congestion control was performed as follows. That is, when congestion occurs, the terminating station where the congestion has occurred notifies the originating station of this fact through an inter-office signal. Upon receiving this, the originating station recognizes that congestion has occurred at the terminating station, and thereafter imposes connection restrictions on that station. In this way, congestion control between each station was realized.

0004

[Problem to be solved by the invention] In this way, conventionally,
When congestion occurs, the terminating station where the congestion occurred notifies the originating station. For this reason, congestion control is triggered only when congestion actually occurs at the receiving station, and this has the disadvantage that effective congestion control cannot be carried out in telephone networks where there is a high possibility of regular call congestion occurring. was there.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an exchange congestion prevention device that can prevent incoming call congestion from occurring.

[0006]

[Means for Solving the Problem] The invention as claimed in claim 1 provides the following features: (i) The dial number of the called destination received from the accommodating terminal such as a telephone set is used as the number of the switching center that accommodates the called destination terminal. (ii) a number translation means for translating into a destination number;
(iii) a number-of-connected-calls storage means for storing the upper limit of the number of calls that can be connected simultaneously for each destination number; and (iv) at the time of a call request from the accommodating terminal, the corresponding number of connected calls in the currently connected call number storage means and the corresponding number of connectable calls in the simultaneously connected call number upper limit value storage means. The switching congestion prevention device is provided with a comparison means for comparing the maximum value with the upper limit value, and (v) a call connection determination means for determining whether or not a call can be connected according to the comparison result of the comparison means.

[0007] In the invention described in claim 1, the originating station side stores the upper limit of the number of calls that can be connected for each other exchange, and constantly monitors the number of calls that are actually connected. Therefore, call connections to the terminating station will be restricted. The invention according to claim 2 further comprises: (i) number translation means for translating a dial number of a calling destination received from an accommodating terminal such as a telephone into a destination number as a number of a switching center that accommodates the called destination terminal; , (ii) an upper limit storage means for the number of concurrently connected calls for storing the upper limit of the number of calls that can be connected simultaneously for each destination number, and (iii) a connection for storing the number of currently connected calls for each destination number. and (iv) upon a call request from the accommodating terminal, the corresponding number of connected calls in the currently connected call number storage means and the corresponding number of concurrently connected calls in the upper limit value storage means. a comparison means for comparing the number of connectable calls with the upper limit of the number of connectable calls; call connection processing means that executes connection processing after storing the added value in the number of connected calls storage means, and cancels the call connection processing if not; and (vi) when any of the connected calls is terminated; , and subtraction means for subtracting by one the corresponding number of calls in the connected call number storage means.

That is, in the invention as claimed in claim 2, the call is connected only when the number of connected calls with the other station of the call connection request is less than the upper limit, and if not, the call connection is canceled. . Then, when a call is connected, the number of connected calls is incremented, and when the call is terminated, the number of connected calls is decremented.

In the third aspect of the invention, the exchange congestion prevention device according to the second aspect is configured to notify the calling terminal when the call connection processing means cancels the call connection processing.

0010

EXAMPLES The present invention will be explained in detail with reference to Examples below.

FIG. 1 shows an exchange congestion prevention device according to an embodiment of the present invention. This device is located within the calling station. This device is equipped with a number translation unit 11, which translates the dial number of the destination telephone received from the telephone housed in the calling station into a destination number indicating the exchange that accommodates the destination telephone. It is supposed to be done. This number translation section 11 is connected to a simultaneously connected call number upper limit storage section 13 and a currently connected call number storage section 14 via a concurrently connected call number limit processing section 12 .

As shown in FIG. 2, the upper limit value storage unit 13 for the number of calls that can be connected simultaneously stores an upper limit value for the number of calls that can be connected simultaneously.
u1" to "ui" are stored in association with each destination number "1" to "i". The number of connected calls storage section 14 stores the number of currently connected calls as shown in FIG. “n1”～“
ni'' are stored in association with each destination number "1" to "i".

[0013] When a call request is received from the telephone set to be accommodated, the simultaneous connection call limit processing section 12 stores the corresponding number of connected calls and the upper limit for the number of simultaneous connection calls in the connection number storage section 14 at that time. The upper limit value of the number of connectable calls in the section 13 is compared with the upper limit value of the number of connectable calls, and predetermined processing is performed based on the comparison result.

The connected call number storage unit 14 is also connected to a post-processing unit 15 that performs predetermined processing after a call is terminated.

The operation of the switch congestion prevention device having the above configuration will be explained with reference to FIG. When input of a dial number of a called destination telephone is started from a telephone housed in a switching office where this device is installed, this is received by a receiving section (not shown). Then, when a number with the number of digits required to specify the switching office (hereinafter referred to as the receiving office) that accommodates the called destination telephone is input, this device is activated.

After startup, the number translation section 11 first refers to a correspondence table (not shown) based on the received number, extracts the destination number of the called station (step S101), and transfers it to the simultaneous connection number limit processing section 12. do. Simultaneously connected call limit processing unit 1
2, based on the extracted destination number, the corresponding upper limit number of concurrently connected calls is read from the upper limit value storage unit 13 for the number of concurrently connected calls shown in FIG. 2 (step S102). For example, when the destination number is "i", the corresponding upper limit value "ui" is read out.

Next, the concurrently connected call number limit processing unit 12 reads the corresponding number of connected calls from the connected call number storage unit 14 shown in FIG. 3 based on this destination number (step S103). For the destination number "i", the number of connected calls "ni" is read out.

[0018] Here, the simultaneous connection call number limit processing unit 12:
Number of connected calls “ni” and upper limit of number of simultaneously connected calls “ui”
(step S104), "ni" is "ui"
” (Y), it is determined that the call can be connected, 1 is added to the number of connected calls “ni”, and the number of connected calls is stored in the storage unit 1.
After writing back to the same address of 4 (step S10
7) Instructs a call connection control unit (not shown) to execute a call connection (step S108).

On the other hand, if "ni" is equal to "ui" (step S104; N), the telephone that made the call request is connected to the announcement trunk (step S1).
05), it is notified that the call control has been restricted, and the call connection is canceled (step S106).

[0020] When the call connection made in this manner is completed, the post-processing unit 15 reads the corresponding number of connected calls from the number of connected calls storage unit 14 based on the destination number of the terminated calling station, and Subtract 1 and write back to the same address.

[0021]

As explained above, according to the present invention, the originating station memorizes the upper limit of the number of calls that can be connected for each other exchange, and constantly monitors the number of calls that are actually connected. As a result, the originating station can implement connection restrictions before incoming call congestion occurs. In particular, in a switching system such as a telephone network where there is a possibility that incoming call congestion may occur on a regular basis, the present invention has a remarkable effect in that the system can be operated smoothly by preventing incoming call congestion.

Further, according to the third aspect of the invention, when the call connection processing means cancels the call connection processing, the calling terminal is notified of this, so that the calling party does not feel uncomfortable. This has the effect of not giving a sense of suspicion or suspicion.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an exchange congestion prevention device in an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the contents of an upper limit value storage unit for the number of simultaneously connected calls provided in the switch congestion prevention device.

FIG. 3 is an explanatory diagram showing the contents of a connected call number storage section 14 provided in this exchange congestion prevention device.

FIG. 4 is a flowchart for explaining the operation of this exchange congestion prevention device.

[Explanation of symbols]

11 Number translation department 12 Simultaneously connected call limit processing unit 13 Simultaneously connected call number upper limit storage unit 14 Connected call number storage unit 15 Post-processing section

Claims (3)

[Claims] [Claim 1] A number translation means for translating a dial number of a called destination received from an accommodating terminal such as a telephone into a destination number as a number of an exchange that accommodates the called destination terminal, and for each destination number, simultaneous connection number upper limit storage means for storing an upper limit of the number of calls that can be connected simultaneously; connected call number storage means for storing the number of currently connected calls for each destination number; Comparison means for comparing the corresponding number of connected calls in the connected call number storage means at that time with the corresponding upper limit value of the number of connectable calls in the upper limit value storage means for the number of simultaneously connected calls when making a call request; and call connection determining means for determining whether or not call connection is possible in accordance with the comparison result of the comparing means. [Claim 2] Number translation means for translating a dialed number of a called destination received from an accommodating terminal such as a telephone into a destination number as a number of an exchange that accommodates the called destination terminal, and for each destination number, simultaneous connection number upper limit storage means for storing an upper limit of the number of calls that can be connected simultaneously; connected call number storage means for storing the number of currently connected calls for each destination number; Comparison means for comparing the corresponding number of connected calls in the connected call number storage means at that time with the corresponding upper limit value of the number of connectable calls in the upper limit value storage means for the number of simultaneously connected calls when making a call request; and, as a result of the comparison by the comparison means, if the number of connected calls is less than the upper limit of the number of connectable calls, a value obtained by adding 1 to the number of connected calls is stored in the number of connected calls storage means. call connection processing means that executes the connection processing after the call has been completed, and cancels the call connection processing if not; 1. An exchange congestion prevention device comprising: a subtraction means for subtracting by 1. 3. The exchange congestion prevention device according to claim 2, wherein when the call connection processing is canceled by the call connection processing means, a calling terminal is notified to that effect.