JPH05284217A - Method for controlling automatic congestion for no.7 signal system trunk and device therefor - Google Patents

Abstract

PURPOSE:To provide the congestion control system of a No.7 signal system trunk implementing the trunk congestion control of the No.7 signal system at the time of a processing against exchange system-down. CONSTITUTION:A part of the No.7 signal system is automatically closed at the restart processing against exchange system-down, the information of the closed trunk is stored in a restart block display area 2a provided on a main storage device 5, the blocked information is notified to an opposite station by using the No.7 signal link 3, the blocked trunks are automatically released stepwise in matching with the system block state after the restart processing, the setting information in the restart block display area 2a is cleared in matching with the release and a block release signal 2c is sent to an opposite station. Transmission restriction is executed to all opposite stations by notifying the block and the block release to the opposite stations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to No. No. 7 in an automatic exchange having a 7-signal system trunk. The present invention relates to an automatic congestion control method and device for a 7-signal system trunk.

[0002]

2. Description of the Related Art In order to execute an exchange connection, it is necessary to exchange various control information between a terminal and an exchange and between an exchange and an exchange. The convention and method relating to this signal transmission / reception is called a signal system. The types of signals can be broadly classified into subscriber line signals and inter-station signals. The subscriber line signal is a signal exchanged between the terminal and the exchange, and includes a calling signal and a restoration signal by raising and lowering the handset, a response signal and a calling signal for sending a dial tone or a bell sound, and a selection signal for sending a dial number. .. Inter-station signals include selection signals for transmitting control information necessary for relay route selection such as dialed number information to the other station, control signals for instructing the other station to operate such as start and disconnect, responses and end calls. , There is a display signal that notifies the other station of the call status. Control signals and display signals are generally called monitoring signals. In addition, there are a charging signal for transferring charge information, a network management signal used for managing and operating a communication network, and a remote control signal for remotely controlling a slave station.

There are an individual line signal system and a common line signal system as such inter-station signal transmission systems. This individual line signaling system is a system in which necessary control signals are exchanged before and after a call using each selected call line. A supervisory control circuit called a trunk is provided in the input / output line section of the exchange, and it is a system in which a signal transmission / reception function is added to this, which is widely used in conventional exchanges such as crossbar exchanges. On the other hand, in an electronic exchange, etc., the control system of both stations can be directly connected by a data communication system dedicated to signal transmission, and all control signals of each line are exchanged using this common data line. There is. As this common line signaling method, CCITT recommendation No. There are 7 signal systems.

Such a conventional No. A trunk congestion control method based on the 7-signal method will be described below with reference to FIG. FIG. 3 is a state transition diagram of conventional congestion control.
In this figure, when the local station detects a congestion state of the line in step 101, it sends a congestion signal to the opposite station (step 102) and shifts to the congestion state (step 10).
3). When congestion recovery is detected (step 10
4) Transmit a congestion release signal to the opposite station (step 10)
5). On the other hand, when the opposite station receives the congestion signal (step 107), it starts restricting transmission to the station that has transmitted the congestion signal (step 108). Then, the call restriction state is maintained (step 109), and when the congestion release signal from the same station is received (step 110), the call restriction is released (step 111).

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The 7 signaling trunk congestion control method does not work unless the switch system is in a congestion state. Therefore, it cannot be used as a preventive measure when it is expected that a congestion state will occur in advance.

[0006] In particular, in order to minimize the interruption time of the call service at the time of resuming from the system down, the switch system minimizes the interruption time of the call service. The rescue call synchronization processing or the like is not performed in the restart processing but is performed after the call service is restarted. Therefore, the processor usage rate of the control system after the call service is restarted is considerably high.

[0007] Therefore, the system restarts the call service while not restricting the usage rate of the processor by implementing the gradual call restriction from the subscriber after the restart processing.

However, no. In the case of the 7-signal trunk, since the outgoing call cannot be promptly regulated and a normal amount of traffic flows from the opposite station, No. An exchange system having a large number of 7-signaling trunks has a problem that it tends to be in a congestion state after restarting.

[0009] Therefore, an object of the present invention is to prevent the situation in which the same level of traffic as that in normal times flows from the opposite station into a congestion state after the system is restarted, and it is possible to satisfactorily avoid it, and to perform stable restart processing with a short service interruption time. It is an object of the present invention to provide an automatic congestion control method and device for a 7-signal system trunk.

[0010]

The first solving means of the present invention for solving the above-mentioned problems is No. A switch circuit network having a 7-signal trunk line, a central processing unit for controlling the switch circuit network, a main memory,
No. 7 of an automatic exchange system having a 7-signal system trunk In the automatic congestion control method for a 7-signal system trunk, when the automatic switching system is reprocessed from system down, the No. A step of automatically blocking a part of a 7-signal type trunk and storing the restart blocking information in the restart blocking display area of the main memory; and after the restart processing, the trunk is stepwise adjusted according to the congestion state of the automatic exchange system. Of the blockade signal and blockage release signal to the opposite station based on the step of automatically releasing the blockage of the block and clearing the restart blockage information and the restart blockage information of the main storage device. 7 signal lines are used for transmission.

A second solution means of the present invention for solving the above-mentioned problems is No. A switch circuit network having a 7-signal trunk line, a central processing unit for controlling the switch circuit network, a main memory, No. 7 of an automatic exchange system having a 7-signal system trunk In an automatic congestion control device for a 7-signal system trunk, when the automatic switching system is reprocessed from a system down, the N
o. An automatic block processing unit that automatically blocks a part of the trunk of the 7-signal system and stores the restart block information in the restart block display area of the main storage device, and stepwise according to the congestion state of the automatic exchange system after the restart process. A congestion processing unit that automatically releases the blockage of the trunk and clears the restart blockage information, and a blockage signal and a blockage release signal to the opposite station based on the restart block information of the main storage device. And a blockage information communication unit that transmits using seven signal lines.

[0012]

Function: No. 1 of the present invention. The automatic congestion control device for the 7-signal system trunk is set in advance by the automatic blockage processing unit immediately after the switching system is restarted from the system down. A part of the 7-signal system trunk is blocked, and the blocking information is held in the restart blocking display area provided in the main storage device. At the same time, the blocked information communication unit sends the information to the opposite station to restrict transmission from the opposite station. Then, in this part of the trunk blocked state, restoration notification processing to the maintenance person, function re-setting processing other than the call service, synchronization processing of rescue call, etc. are performed. After the post-restart processing, the congestion canceling processing is performed to gradually cancel the trunk blocked by the congestion processing unit so that the usage rate of the central processing unit does not exceed a predetermined value.

[0013]

The present invention will be described below with reference to the drawings. FIG. 1 is a state transition diagram of an embodiment of the present invention, and FIG. 2 is a configuration diagram of an exchange system 11 of an embodiment of the present invention. In FIG. 2, the switch network 1 has a plurality of No.s connected to the opposite station. A 7-signal type trunk line 4 is connected, and a central processing unit (hereinafter, CPU) 2 for selecting a switch path of the switch circuit network and controlling the connection etc. is connected to the switch circuit network 1. Further, a main storage device 5 is connected to the CPU 2. Also C
No. 2 is assigned to PU2. The 7 signal link 3 is connected to exchange monitoring signals or remote control signals with an opposite station (not shown).

The operation of the above arrangement will be described below with reference to FIG. At the time of restarting the system after the switching system 11 of the own station goes down (Step 20)
1), the usage rate of the CPU 2 is a predetermined value (for example, 60
No., in order not to exceed the percentage. 7
The trunk of the signaling trunk line 4 is automatically blocked by 50% (step 202). And the main storage device 5
Each blockage No. in The restart blocking information (for example, integer value 1) is set in the restart blocking display area 2a corresponding to the 7-signal system trunk. In addition, No. 7 When the signal route recovers from the system down to the usable state and both trunks of the own station and the opposite station are out of synchronization, the circuit reset signal 2d is transmitted to the opposite station in order to synchronize the own station and the opposite station. .. Then, when the line reset signal is received from the opposite station, the CPU
2 refers to the restart blocking display area 2a corresponding to the trunk, and if the corresponding trunk is in the restart blocking state (for example, an integer value 1), the CPU 2 sends the blocking signal 2b to the opposite station. 7
Transmission is performed using the signal link 3, and the normal state is changed to the incoming call regulation state (step 204). In addition, the activation signal from the opposite station is No. If the 7 signaling trunk is received,
By referring to the restart blocking display area 2a corresponding to this trunk, if the restart blocking state (for example, an integer 1), the CPU 2 sends the blocking signal 2b to the opposite station that sent the activation signal. 7 signal link 3 transmits.

In this way, the restoration notification processing to the maintenance person, the function re-setting processing other than the call service, the synchronization processing of the rescue call for restoring the state before the system down, and the like are performed.
When the usage rate of the above is reduced to a predetermined value or less, the post-restart processing is ended (step 205), and the blockage of the trunk is automatically released as follows (step 206). After the above restart processing,
The CPU 2 periodically performs the congestion canceling process. If the usage rate of the CPU 2 is equal to or higher than a predetermined value (for example, 60%), the congestion canceling process is not performed. If the restart blocking state is referred to by referring to the restart blocking display area 2a corresponding to the 7-signaling trunk, restart blocking release information (for example, 0) is set in the restart blocking display area 2a, and there is no other blocking factor (for example, maintenance blocking). If
The block is released, and the block release signal 2c is sent to the opposite station.
The signal is transmitted using the 7-signal link 3 (step 207) and the normal state is entered (step 200).

On the other hand, the opposite station which has received the blocking signal 2b (step 209) blocks the receiving trunk by this blocking signal 2b and regulates the outgoing traffic to the station which has transmitted the blocking signal 2b (step 210). , The transmission restriction state is entered (step 211). Next, the blockage release signal 2
When "c" is received (step 212), the blocking of the receiving trunk is released, the restriction of transmission of the blocking signal 2b to the originating station is released, and the traffic is normally flowed (step 2).
13).

As described above, it is possible to prevent the congestion from occurring when the system is restarted. In the above description, the case where each process is performed by the program provided in the CPU has been described, but it may be performed using a dedicated digital signal processor for performing each process, or each logic circuit may be used. Is also good.

[0018]

As described above, according to the present invention, the main memory is provided with the restart blocking display area to reduce the usage rate of the central processing unit after the restart processing from the system down, and to rapidly reduce the congestion state. In order to avoid inrush, immediately after restarting No. A part of the 7-signal system trunk is blocked, and the blockage information is held in the restart blockage display area and is sent to the opposite station to restrict transmission from the opposite station. Then, in this part of the trunk blocked state, restoration notification processing to the maintenance person, function re-setting processing other than the call service, synchronization processing of rescue call, etc. are performed. After the post-restart processing, the congestion release processing is performed to gradually release the blocked trunk so that the CPU usage rate does not exceed a predetermined value. This results in No. Immediately after restarting an exchange system having a large number of 7-signal trunks after the system goes down, system setting processing can be performed satisfactorily, and moreover, a part of all trunks is automatically blocked to perform traffic processing stepwise. As a result, it is possible to satisfactorily avoid a situation in which the traffic equivalent to that in the normal situation flows into the congestion state after the system is restarted and enters a congestion state, and stable restart processing with a short service interruption time can be performed.

[Brief description of drawings]

FIG. 1 relates to one embodiment of the present invention and is a state transition diagram thereof.

FIG. 2 is a system configuration diagram of an embodiment of the present invention.

FIG. 3 is a state transition diagram of a conventional method.

[Explanation of symbols]

 1 switch circuit network 2 central processing unit 2a restart block display area 2b block signal 2c block release signal 3 No. 7 signal link 4 No. 7 signal system trunk line 5 main memory 11 exchange system

Claims (2)

[Claims] 1. No. A switch circuit network having a 7-signal trunk line, a central processing unit for controlling the switch circuit network, a main memory, No. 7 of an automatic exchange system having a 7-signal system trunk In the automatic congestion control method for a 7-signal system trunk, when the automatic switching system is reprocessed from system down, the No. A step of automatically blocking a part of the trunk of the 7-signal system and storing the restart blocking information in the restart blocking display area of the main memory; and after the restart processing, the trunk is stepwise adjusted according to the congestion state of the automatic exchange system. Automatically releasing the blockage of, and clearing the restart blockage information, a blockage signal based on the restart blockage information of the main storage device,
The blockage release signal is sent to the opposite station. No. 7 signal line is used for transmission. 7 Signaling trunk automatic congestion control method. 2. No. A switch circuit network having a 7-signal trunk line, a central processing unit for controlling the switch circuit network, a main memory, No. 7 of an automatic exchange system having a 7-signal system trunk In an automatic congestion control device for a 7-signal system trunk, when the automatic switching system is reprocessed from system down, the No. An automatic block processing unit that automatically blocks a part of the 7-signal system trunk and stores the restart block information in the restart block display area of the main storage device; and a stepwise process according to the congestion state of the automatic exchange system after the restart process. A congestion processing unit that automatically releases the blocking of the trunk, clears the restart blocking information, and a blocking signal based on the restart blocking information of the main storage device,
The blockage release signal is sent to the opposite station. No. 7, characterized in that it has a blockage information communication unit that transmits using a signal line. 7
Automatic congestion control device for signaling trunk.