JPH04212547A - Call termination impossibility informing system - Google Patents

Abstract

PURPOSE:To prevent the processing load of a communication processor from being increased without increasing economical burden or service on a terminal equipment side. CONSTITUTION:For a communication processor 20, plural lines 211, 212,... are subscribed to a line exchange network 22 with the same representative number, and communication is executed through the line exchange network 22 to plural terminal equipments 231, 232,.... A supervisory means 24 supervises the own load state due to the communication processing and grasps whether the respective housed lines 211, 212,... are in a used state or an unused state. When the own throughput is compared with the load state of the supervisory means 24 and the processing is disabled, a call termination regulating means 25 turns the unused line grasped by the supervisory means 24 to a busy state and inhibits any new incoming call to the same representative number.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incoming call notification system. Specifically, the present invention relates to a method for notifying the circuit switching network that a call cannot be received when the processing capacity of a communication processor that performs communication with a plurality of terminals, such as a personal computer, via a circuit switching network has reached its limit.

0002

2. Description of the Related Art FIG. 4 shows a block diagram of an example of a conventional communication system. In the figure, a communication processor 1 includes a plurality of (
For example, a plurality of terminals 31, 32 are connected via the circuit switched network (public telephone network) 2 using the same representative number subscriber line (for example, 6 lines).
,... communicates with. For example, in personal computer communication, the terminal 3 such as a personal computer terminal or a word processor terminal
1, 32, ... is, for example, 2400bps per line
Digital communication is performed with other terminals using subscriber lines with a speed of . In this case, the processing load on the communication processor 1 varies depending on the number of communicating terminals, communication line speed, etc.

[0003] Conventionally, when the processing load of the communication processor 1 approaches the limit of its processing capacity, the following methods are used: (1) forcibly disconnecting a newly arrived line after connection, or (2) regulating the data flow rate by flow control. The processing load on the communication processor 1 is controlled so as not to exceed its processing capacity. Alternatively, (1) The number of lines is designed in anticipation of the maximum load on each line to avoid overshooting the processing capacity.

0004

[Problem to be Solved by the Invention] In the case of (2) above, since the line is disconnected after once accepting an incoming call from the circuit-switched network 2, the minimum charge is made on the circuit-switched network 2 side, which is uneconomical. There was a problem. In addition, in the case of (■) above, although it is possible to communicate on the newly received line,
In order to perform flow control, the throughput of all subscriber lines including other lines decreases (set so that the overall processing capacity of the communication processor 1 is reached), and as a result, the throughput required to transmit a certain amount of data decreases. As time increases, circuit switched network 2
Since the connection time to the network becomes long, the charge on the circuit switching network 2 side becomes large, and there is a problem that the service quality deteriorates. Furthermore, in the case of (■) above, taking into account that calls may be received at various communication speeds such as personal computer communication, the number of lines should be set to a small number in anticipation of the maximum load on each line. This has the problem that if only a low-speed line is connected, the processing capacity of the communication processor 1 will be wasted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a call rejection notification method that prevents an increase in processing load on a communication processor without increasing the economic burden on the terminal side or degrading serviceability.

[0006]

[Means for Solving the Problems] FIG. 1 shows a diagram illustrating the principle of the present invention. In the figure, 20 is a communication processor, in which multiple lines 211 , 212 , . . A monitoring means 24 monitors its own load state through communication processing and determines whether each accommodation line (211, 212, . . . ) is in use or unused. Reference numeral 25 denotes an incoming call restriction means which compares its own maximum processing capacity with the load state of the monitoring means 24, and when it becomes unable to process calls, puts an unused line known by the monitoring means 24 into a busy state.

[0007]

[Operation] The monitoring means 24 constantly monitors the processing load state of the communication processor 20, and when the processing load exceeds the maximum processing capacity or the remaining processing capacity is insufficient,
The incoming call restriction means 25 is activated. The incoming call restriction means 25 puts the unused lines known by the monitoring means 24 into a busy state and prohibits new incoming calls to the same representative number. As a result, the newly calling terminal is not connected to the communication processor 20, the user of the terminal is not charged, and no flow control is performed. There is no reduction in service quality for other terminal users who are communicating.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows a block diagram illustrating an embodiment of the present invention, in which the same components as in FIG. 4 are designated by the same numbers. In FIG. 2, 10 is a communication processor whose maximum processing capacity is set to, for example, 9600 bps, and is determined by the total line speed of each subscriber line. The communication processor 10 includes a line control unit (SIO) that controls each line.
) 121 to 126, a memory 13, and a control unit (CPU) 14 that controls the entire processor. The control unit 14 performs control according to the flowchart shown in FIG. The memory 13 includes a load monitoring function unit (consisting of a software module) 13a that monitors the load state of the communication processor 10, and an incoming call restriction processing unit (consisting of a software module) that restricts incoming calls when the processing capacity of the communication processor 10 reaches its limit. 13b, and a line status display table 13c in which the usage status of each subscribed line is registered. 151 to 156 are modems connected to the circuit switching network 16 via subscriber lines 111 to 116, respectively, and RS-232C interfaces 191 to 1
96 (actually composed of many signal lines, but only the lines are shown to simplify the diagram), the line control unit 121
~126 is connected. This modem (151
~156) is the circuit switched network 1 due to the off state of the ER line.
6 has a function of notifying the busy state.

Next, the operation of the present invention will be explained in conjunction with the flowchart shown in FIG. In FIG. 2, the control unit 14 constantly monitors the communication status of lines 111 to 116 (step 50 in FIG. 3).
When a new call arrives, the call is accepted, the call is connected to the telephone line via the line control unit and modem corresponding to the incoming line, and the line speed is determined (step 51). The control unit 14 updates the line status display table 13c for this telephone line connection to make it "in use" (step 52). On the other hand, when communication ends on a certain line, this is detected and the line where the communication has ended is disconnected (step 53).
The line status display table 13c is updated to "unused" (step 52).

Next, the load monitoring function section 13a controls the control section 14.
The load state of the communication processor 10 is monitored (step 54 in FIG. 3), and the maximum processing capacity (9600 bps) of the communication processor 10 is compared with the load state (step 55). Currently, each of lines 111 to 114 is communicating at, for example, 2400 bps (9600 bps in total).
), the load monitoring function unit 13a informs the control unit 14 and the incoming call restriction processing unit 13b that the processing capacity is at its limit.
The incoming call restriction processing unit 13b refers to the line status display table 13c under the control of the control unit 14, and sets the ER line (joined line ) to turn off (step 56). Based on this instruction, the line control units 125 and 126 control the respective ER lines 11.
When the modems 5 and 116 are turned off and a new call arrives from the circuit switched network 16, the modems 155 and 156 notify the circuit switched network 16 of a busy state for the new call from the circuit switched network 16. As a result, the terminal that has made a new call will not be connected to the communication processor 10.

On the other hand, when the communication on the line 111 that was in progress is terminated, the total load becomes 7200 bps, so the load monitoring function section 13a informs the control section 14 and the incoming call that the processing capacity of the communication processor 10 is not at its limit. Regulation processing section 1
3b (step 55), and the incoming call restriction processing unit 13b
refers to the line status display table 13c and selects a busy line among the "unused" lines (in this case, line 115,
116) is released (step 57).

[0012] In this way, when the communication processor 10 is at its processing capacity limit (9600 bps), a newly incoming terminal is not connected to the communication processor 10, but the busy state is notified to the terminal. , there is no charge for that terminal, and since flow control is not performed, there is no deterioration in service quality for other terminal users who are communicating. Furthermore,
There is no need to set a small number of accommodated lines, and the ability of the communication processor 10 is not wasted.

In FIG. 2, another communication processor 17 having the same function as the communication processor 10 is provided for the line switching network 16, and joins the line switching network 16 with the same representative number as each line of the communication processor. Therefore, if a new call arrives while the communication processor 10 is at its processing capacity limit, the line switching network 16 controls the communication processor 10 to connect a new call to the lines 115 and 116 that could not be connected due to busy conditions. Switching control may be performed so that incoming calls are received on the lines 181, 182, . . . of the communication processor 17. In this way, serviceability can be further improved.

[0014]

Effects of the Invention According to the present invention, when the communication processor is at its processing capacity limit, a busy notification is sent to a terminal that has newly received a call, so the terminal is not charged, which makes it economical. Moreover, since flow control is not performed, there is no deterioration in service quality for other terminal users during communication, and there is no need to limit the number of lines in consideration of capacity. Therefore, the capacity of the communication processor is not wasted. Further, since new calls to a line that could not be connected due to busy conditions are received on a line of another communication processor, serviceability can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle of the present invention.

FIG. 2 is a block diagram illustrating an embodiment of the present invention.

FIG. 3 is an operation flowchart of the present invention.

FIG. 4 is a block diagram of a conventional example.

[Explanation of symbols]

31 , 32 ,..., 231 , 232 ,... Terminals 10, 17, 20, 26 Communication processor 111
〜116 , 181 , 182 , 211 〜216
, 27 Lines 121 to 126 Line control section 13 Memory 13a Load monitoring function section 13b Incoming call restriction processing section 13c Line status display table 14 Control section 151 to 156 Modem 16, 22 Line switching network 191 to 196, 181, 182 RS23
2-C interface 24 Monitoring means 25 Incoming call restriction means

Claims (2)

[Claims] Claim 1: A plurality of lines (
211 , 212 , ...) joins a circuit switching network (22) using the same representative number and communicates with a plurality of terminals (231 , 232 , ...) via the circuit switching network (22), The communication processor (20) determines its own load state due to communication processing and the line (211).
, 212, ...) is in a used state or an unused state, and compares its own maximum processing capacity with the load state of the monitoring means (24) and determines whether the remaining processing capacity is exhausted. Incoming call restriction means (25) is provided to place the unused line known by the monitoring means (24) into a busy state, thereby prohibiting new calls to the same representative number. Notification method. 2. A line (27) of a communication processor (26) other than the communication processor (20) is connected to the line switching network using the same representative number as the lines (211, 212, . . . ) of the communication processor (26). (22), and the line (215, 216) that could not be connected due to the above-mentioned busy
2. The incoming call rejection notification system according to claim 1, wherein a new incoming call to a call destination (21) is made to arrive at the line (21).