JPH0154897B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an economical traffic control system using a common line signaling network.

Communication networks such as telephone networks are equipped with circuits and exchanges to ensure a certain level of connection quality for normal traffic. In recent years, for example, in telephone networks, inquiries and calls accompanying disasters have been concentrated in disaster areas, and a situation has arisen in which a load on the telephone network far exceeds the designed traffic. Under these circumstances, telephone network equipment is insufficient compared to the added traffic, resulting in an increase in unfinished calls, significantly reducing the efficiency of the telephone network, leading to telephone network congestion and even paralysis of the telephone network. There is a fear. Therefore, traffic control is required to prevent congestion in the telephone network and maintain the communication capability of the telephone network. Conventional traffic control methods have been proposed that monitor the congestion of exchanges and lines, transfer this information to a traffic control device, and instruct each exchange to regulate traffic from the traffic control device. A congestion detection device is required for the exchange,
This method has the disadvantage of requiring a dedicated transfer link between the congestion detection device and the traffic control device, which requires a large amount of cost.

In order to eliminate these drawbacks, the present invention measures the number of calls to the ground, the number of completed calls, etc. at a signal repeater of a common signal network, and based on these measurement data,
This system determines that calls to specific destinations should be restricted and instructs traffic control signals such as restriction signals to the exchange via a common line signal network.The drawings will be described in detail below.

FIG. 1 is a configuration diagram of an embodiment of the present invention,
1, 2, 3, 4, 5, 6, 7, 8 are exchanges, 1
1, 12, 13, 14, 15, 16, 17, 1
8, 19 are audio circuits, 21, 22, 23 are signal repeaters that relay common line signals, 24, 25 are traffic control circuits, 31, 32, 33, 34, 35,
36, 37, 38, 39, and 40 are common signal lines.

As the signal system in FIG. 1, a common line signal system is used. The common line signaling system is a signaling system in which the call connection signal is transmitted on a signal line separate from the voice circuit, and the signal line is shared by each call.In addition to not requiring a signal transmission circuit on the voice line, the common line signaling system transmits call connection signals on a signal line separate from the voice circuit. It has the advantage of being able to use different types. The present invention provides a common line signal network (common line signal line 3) that transmits signals of this common line signaling system.
Traffic control is performed using a network consisting of signal repeaters 21, etc. The connection operation for a call from exchange 1 to exchange 4 will be explained as follows. The exchange 1 captures the voice circuit 11 and records the originating exchange number, the captured voice line number,
The common line signal line 31 connects the connection signal of the next converter 5, etc.
The signal is sent to the signal repeater 21 via. This connection signal is called an address signal. The signal repeater 21 analyzes the connection signal and relays the connection signal to the next exchange 5 via the common signal line 33. Next, when the exchange 5 acquires, for example, the voice circuit 13, the connection signal is transmitted to the common line signal line 33, 35,
36, 37, and is relayed to the exchange 8 via the signal repeaters 21, 22, and 23. Thereafter, the call arrives at the exchange 4 in the same manner. When a subscriber accommodated in the exchange 4 responds, a response signal is transferred to the exchange 1 via the common signal network in the opposite direction. Also,
When the call is terminated, a disconnection signal is transferred to the transit exchange via the common line signaling network to release the voice line used by the call. Therefore, for example, signal repeater 2
If connection signals are monitored in step 1, it is possible to measure, for example, the number of calls added and the number of completed calls for each region, and it is possible to obtain, for example, the incomplete rate for each region, and traffic can be controlled based on this. .

Figure 2 is an example of the signal format of the common line signal (CCITT No. 7 system), where 51 is a header, 5
2 is the terminating exchange number, 53 is the originating exchange number, 5
4 is the line number, 55 is the signal type, 56 is the error code, 57 is the selection number attached to the address signal (incoming subscriber number), and 58 is the label (52, 53,
54). The terminating exchange number 52 and the originating exchange number 53 are the terminating and originating exchange numbers for common channel signals, but not for calls. For example, when the voice line 13 is captured by the exchange 5 in FIG. Note that the line number 54 is the captured line number of the voice line 13. Therefore, the call can be uniquely identified by the label using the signal repeater 21 or the like.

FIG. 3 shows an embodiment of the traffic control circuit (24, 25 in FIG. 1) according to the present invention. 61 is a common control circuit; 62 is a memory for storing call information;
63 is an arithmetic circuit, 64 is a register, 65 is a ground conversion circuit that converts a selection number to a ground (number), 6
6 is the input of the register 64, 71, 72, 73 are the fields of each word of the memory 62, 71 labels, 72
is the ground, 73 is the field that remembers the air block, 74
are characteristic addresses of the memory 62, 75, 76, and 77 are fields of the register 64, 75 is a label, 76 is a signal type, 77 is a field in which a selection number is set, 78 is a control line for the arithmetic circuit 63, and 81 is for each ground. a memory for storing the number of calls; 82 is an arithmetic circuit; 8
3,84 is the field of each word in the memory 81, 83
84 is a field for storing the number of completed calls for each location, 85 is a specific address in the memory 81, 86 is a control line for the arithmetic circuit 82, and 87 is an output for sending a regulation signal for each location. .

As in the previous embodiment, a call from exchange 1 to exchange machine 4 will be explained as an example. When the address signal from the exchange 1 reaches the signal repeater 21, the signal repeater 21 stores the label, signal type, and selection number of the address signal in the register 6 via the input 66 in FIG.
Set to 4. The common control circuit 61 is the feed 7
6 (signal type), identifies the address signal, and instructs the arithmetic circuit 63 via the control line 78 to read the memory 62 and find a vacant word. An empty word can be identified by field 73 (empty) being "0". When a vacant word, for example, a specific address 74, is found, the arithmetic circuit 63 notifies the common control circuit 61 of the specific address 74. The common control circuit 61 writes the label of the field 75 (label) and the destination of the selection number converted by the ground conversion circuit 65 to a specific address 74 to the arithmetic circuit 63, and sets the field 73 (empty) at the address to "1". ”
instruct the user to set it to . Therefore, the label, destination, and blockage indication of the call are set at the address. At the same time, the common control circuit 61 reads the ground signal converted by the ground converting circuit 65 via the arithmetic circuit 63, and sends it to the arithmetic circuit 82 via the control line 86.
The address in the memory 81 corresponding to the destination, for example, the field 83 (number of calls added by destination) storing the number of calls added to the specific address 85 is instructed to add one. The arithmetic circuit 82 reads the contents of the field 83 (number of added calls for each destination) at the specific address 85, adds 1 to the contents of the field 83 (number of calls added for each destination), and transfers this value back to the field 83 of the specific address 85. (Number of calls added by region). Through this process, the number of calls to the destination of the exchange 4, for example, the destination A, is counted. When the call arrives at the exchange 4 and the subscriber responds, the response signal is relayed in the opposite direction to the address signal and passes through the signal repeater 21. When a response signal is sent back from exchange 5 to exchange 1, the response signal is sent back to signal repeater 2.
1, and the label and signal type are set in register 64 via input 66 as before. The common control circuit 61 reads the field 76 (signal type), detects that the signal in the field 76 (signal type) is a response signal, and instructs the arithmetic circuit 63 to write the label in the field 71 (label) in the memory 62. A command is given via the control line 78 to read out words whose labels in the field 75 (label) are the same, with the originating exchange number and the terminating exchange number swapped. The arithmetic circuit 63 reads out each word from the memory 62, and reads out the word that satisfies the above conditions, in this case the specific address 74. This process is a process of comparing the response signal with the corresponding address signal and determining the destination of the response signal. The reason why the originating and terminating exchange numbers are swapped in the label of field 75 (label) is that the response signal and address signal have opposite signal directions, so in the response signal, the terminating exchange number is exchange 1 and the originating exchange number is exchange 5. This is because the address of the call and the response signal can be matched by the above-mentioned replacement. When the specific address 74 is read, the common control circuit 61 receives the destination of the field 72 (destination) of the address, and sends a message to the arithmetic circuit 82 via the control line 86 so as to add 1 to the number of completed calls for the destination. and the arithmetic circuit 82 is at a specific address 8.
Read field 84 (number of completed calls by region) of No. 5, and set 1 to the content of field 84 (number of completed calls by region).
This value is again written in the field 84 (number of completed calls for each destination) of the specific number 85, and the number of completed calls for that destination is updated. When a call ends or a call is lost within the communication network, a disconnection signal is sent from the exchange 1. Similarly to the above, when the disconnection signal reaches the signal repeater 21, the label and signal type of the disconnection signal are set in the register 64 via the input 66 as described above. The common control circuit 61 connects the label of the field 71 (label) and the field 7 via the control line 78.
5 (label) in the memory 62 that matches the label, and instructs the arithmetic circuit 63 to clear the word (all "0"). Arithmetic circuit 63 reads memory 62, finds an address matching the above conditions, in this case specific address 74, writes all "0" to specific address 74, and prepares specific address 74 for the next call. Through the above processing, the number of added calls and the number of completed calls for each destination regarding the connection signal passing through the signal repeater 21 are counted. The common control circuit 61 calculates the non-completion rate for each area to the arithmetic circuit 82 at a fixed period, for example, every 100 seconds, and sends a control line 86 to report the regulated ground where the non-completion rate exceeds the regulation threshold and the regulated rate.
Direct through. The arithmetic circuit 82 reads the memory 81 and inputs a field 83 (the number of calls to be added by region),
Calculate the non-completion rate ((number of added calls - number of completed calls) / number of added calls) for each region from the number of calls added and the number of completed calls of 84 (number of completed calls by region), and The control rate is determined and notified to the common control circuit 61. The restriction rate y is based on the calculation formula, for example, y=K ₂ x ² +k ₁ x+k ₀ (ki: coefficient), where the incompleteness rate is x.
The common control circuit 61 sends a regulation signal (traffic control signal) of the regulation destination and regulation rate to the signal repeater 21 via an output 87, and the signal repeater 21 transmits the regulation signal to the exchanges 1, 2, or other The exchange receives the restriction signal and restricts the call by connecting the call to a busy trunk or talk trunk based on the restriction signal. The reason for restricting calls with a high rate of incomplete calls for each destination is that if a call to that destination is placed within the communication network, there is a high probability that the call will be incomplete, and an incomplete call uses the resources of the communication network ineffectively. This is because it becomes a factor that reduces the ability of the network to pass through. Since not only address signals from exchanges 1 and 2 but also address signals for the same call from exchange 5 pass through the signal repeater 21, connection signals for the same call are processed redundantly, which is wasteful. Therefore, it is better to limit the exchanges to be measured. For example, the exchange to be measured is registered in the signal repeater 21, the signal repeater 21 identifies the originating exchange number (the terminating exchange number in the response signal), and supplies only the connection signal with the corresponding label to the input 66. do it. The exchange to be measured does not necessarily have to be a call from a subscriber exchange that directly accommodates subscribers, but may be a relay exchange, such as the exchange 5. In addition, in the above example, the target is a call from an exchange in the originating hierarchy, but it is also possible to target a call to an exchange in the terminating hierarchy, for example.
In this case, when supplying the connection signal to input 66, the incoming exchange number on the label may be changed to, for example, exchange 1,
If it is limited to 2, the non-completion rate for each destination of calls arriving at exchanges 1 and 2 from exchanges 3 and 4, etc., can be determined, so either method is possible. Even when the target is a call at the terminating level, it is possible to specify a call to either a subscriber exchange or a transit exchange, just as when the target is a call at the originating level. In Figure 1, we took as an example a case in which the common line signaling system is used as the signaling system, but even in a communication network where individual signaling systems are mixed, it is possible to obtain the call incomplete rate by area using the common line signaling system. The invention can also be applied to communication networks in which individual signaling systems are mixed. In this case, the restriction information may be transferred to an exchange that does not have a common signal line using a dedicated line or the like.
Note that the non-completion rate by location does not need to be based on all calls; sample calls are sufficient. Therefore, the capacity of memory 62 can be reduced by using sample calls.

The above explanation was an example of traffic control that performs regulation for each destination based on the incompleteness rate, but in addition to this, it is also possible to stop detouring (or stop some calls) for calls with a high incompleteness rate for each destination. There is also a traffic control method that instructs the switch to For example, normally, the exchange 5 selects the voice line 13 as the first selection route for a call to the exchange 4, and if the voice line 13 is completely blocked, the call is detoured to the voice line 14 as the second selection route. Control may be performed to stop the detour for calls to the exchange 4 (calls to a specific destination), and the present invention is not limited to regulation by destination.

In addition, although traffic control based on the incomplete rate has been described, it is also possible to set a threshold value for the number of calls to be added to each region based on the number of calls to be added to each region in field 83 (number of calls to be added to each region). It is also possible to use a traffic control method in which the number of calls determined in advance is compared with the number of calls for each destination in the field 83 at regular intervals, and the exchange is instructed to restrict the number of calls for destinations exceeding the threshold by the proportion that exceeds the threshold. Furthermore, in Figure 3, the number of added calls and the number of completed calls for each destination were measured, but the number of added calls for each route, the pair of originating exchange number and terminating exchange number,
There is also a method of measuring the number of completed calls and controlling traffic based on the incomplete rate for each route or the number of added calls; however, the present invention is not limited to traffic control based on the measured number of calls for each destination. Although FIG. 1 shows an example in which the traffic control circuits 24 and 25 are provided in the signal repeaters 21 and 23, it is sufficient to provide the traffic control circuit in at least one signal repeater.

As explained above, the present invention includes a traffic control circuit that measures the number of added calls, the number of completed calls, etc. for each destination in a signal repeater of a common channel signal network, and controls traffic based on the data of the measurement results. Since this is a system in which the connection signal passing through the signal repeater is processed by the traffic control circuit to control traffic, the number of traffic control circuits can be reduced. Furthermore, since traffic control signals are transferred using a common line signal network, there is no need to separately provide an information network for traffic control, and an economical traffic control system can be realized.

The present invention is effective not only in telephone networks but also in line switching networks such as facsimile networks and data switching networks.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is an example of a common line signal format, and FIG. 3 is an embodiment of a traffic control circuit according to the present invention. 1, 2, 3, 4, 5, 6, 7, 8... switchboard,
11, 12, 13, 14, 15, 16, 17, 1
8, 19... Voice line, 21, 22, 23... Signal repeater, 24, 25... Traffic control circuit,
31, 32, 33, 34, 35, 36, 37, 3
8, 39, 40... Common line signal line, 51... Header, 52... Incoming exchange number, 53... Outgoing exchange number, 54... Line number, 55... Signal type, 56... Error code, 57 ...Selection number, 58
... Label, 61 ... Common control circuit, 62 ... Memory, 63 ... Arithmetic circuit, 64 ... Register, 6
5...Ground conversion circuit, 66...Input, 71,7
2, 73...Field, 74...Specific address, 7
5, 76, 77...Field, 78...Control line, 81...Memory, 82...Arithmetic circuit, 83,
84...Field, 85...Specific address, 86...
...Control line, 87...Output.

Claims (1)

[Claims] 1. Measure traffic data in at least one signal repeater constituting a common channel signal network by monitoring a connection signal passing through the signal repeater, and measure traffic data based on the traffic data. A traffic control circuit for controlling traffic is provided, and the signal repeater transmits the traffic control signal obtained by the traffic control circuit to an exchange via a common line signal network, or for an exchange not equipped with a common line signal line. The exchange that transferred the traffic control signal to the exchange via the dedicated line and received the traffic control signal,
A traffic control system characterized in that calls are controlled based on the traffic control signal.