JPH0155620B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to traffic control in which, when abnormal traffic is added in a general service exchange, traffic is restricted by service type. This invention relates to a traffic control system for a general service exchange that regulates outgoing calls based on service types based on incompleteness rates.

Conventionally, exchanges were specialized for each service, such as telephone exchanges, facsimile exchanges, and data exchanges, but recently, with the development of digital switching technology, integrated service exchanges that handle various services with the same exchange have become practical. It is expected that economicalization will result from integration. When more traffic than designed is added to a general service exchange, the exchange becomes congested, the number of incomplete calls increases, and the processing capacity of the exchange decreases. For this reason, as implemented in conventional exchanges, outgoing call regulation is being considered to restrict calls that enter the integrated service exchange. However, in the conventional method, service calls for various services are regulated uniformly, which is effective against overloads where traffic increases uniformly, but when certain services such as facsimile services increase. In the event of an overload, other service calls that can be completed calls, such as data service calls and telephone service calls, have the disadvantage of being restricted.

In order to solve these drawbacks, the present invention measures the non-completion rate for each service type, and when congestion in the integrated service exchange is detected, calls are made according to the service type based on the non-completion rate for each service type. The drawings will be explained in detail below.

Figure 1 shows an example of the configuration of a general service exchange, in which 1 is a communication path, 2 is a central processing unit, 3 is a telephone terminal, 4 is a facsimile terminal, and 5 is a compound terminal that includes telephone and data terminal functions. , 6 is a telephone line, 7 is a data line, 8 is a storage trunk for facsimile signals, and 9 is a facsimile line. For example, if the traffic of facsimile services increases rapidly and the storage trunk 8 becomes congested and the number of incomplete calls increases, switching processing is used ineffectively and telephone services deteriorate significantly. In this case, by restricting only facsimile service calls, other services can be processed normally, and the communication ability of the exchange can be maintained at a high level. FIG. 2 shows an embodiment of the present invention, in which 21 is a memory, 22 and 23 are fields for each word of the memory 21, 24 is a specific address of the memory 21, 25 is an arithmetic circuit, 26 is an address line, and 27 is a control 28 is a plurality of registers, 29 is a collation circuit, 30 is an AND circuit, 31 is a regulation signal generation circuit,
32 is a read/write line for the memory 21; 33, 3;
4, 35, 36, and 37 are output lines, 38 is an input line indicating the service type, and 39 is an input line indicating exchange congestion. Each word in the memory 21 corresponds to a service type, and the field 22 of each word stores the number of calls for the service, and the field 23 stores the number of incomplete calls for the service. When the terminal makes a call and the type of service is determined by call analysis, the address corresponding to the service is shown on the address line 26,
A signal is applied to the control line 27 to add 1 to the field 22 containing the contents of the address and store it again at the same address. Further, if the call becomes an incomplete call due to the line being full, etc., the address corresponding to the service is similarly shown on the address line 26, and the control line 2
7, set the field 23 containing the contents of the address to 1.
A signal is given to add and store at the same address again. In this way, the number of calls added to the service type and the number of incomplete calls are stored in the fields 22 and 23 of the memory 21. After a certain period of time has elapsed, the control line 27 is used to sequentially read the contents of the memory 21 and calculate the non-completion rate (number of incomplete calls/number of calls added) from the number of added calls and the number of incomplete calls in the fields 22 and 23. to clear the fields 22 and 23, and furthermore, when the incompleteness rate is above a certain value, the service type is registered in the register 28, and when the incompleteness rate of the service registered in the register 28 is below a certain value (for example, 0.1 or less), the service type is registered in the register 28. ), a signal to delete the service is given from the register 28. At this time, addresses are sequentially applied to the address lines 26. As a result, service types whose incompleteness rate is equal to or higher than a certain value are registered in the register 28. Note that if the number of added calls is small, the dispersion of the non-completion rate becomes large, so service type calls for which the number of added calls is a certain value or more and the non-completion rate is more than a certain value may be registered in the register 28.

It should be noted that the threshold value of the non-completion rate is not necessarily used to detect congestion of a specific service, but is used to determine which service type should be regulated when the integrated service exchange becomes congested.

When a call is made and the service type is determined by call analysis, the service type is shown on the input line 38, and the comparison circuit 29 compares it with the service type registered in the register 28, and if there is a match, the output line 3
5 is set to logic "1". At this time, if the exchange is congested and the input line 39 becomes logic "1", the output line 36 becomes logic "1". When the output line 36 becomes logic "1", the restriction signal generation circuit 31 changes the output line 37 to logic "1" with a preset probability, indicating that the call is restricted. The call processing program reads output line 37 and regulates the call. Restricted calls do not need to be counted in the additional calls mentioned above.

For example, as the number of facsimile service calls increases,
When the storage trunk 8 becomes congested, the incompleteness rate of the facsimile service increases, and the facsimile service is registered in the register 28. At this time, if the exchange is congested, only facsimile service calls are regulated at a certain regulation rate, and other service calls are not unnecessarily regulated.

Switch congestion may be detected by conventional means such as detecting when the efficiency of the central processing unit or the total busy rate of the incoming call buffer exceeds a congestion threshold. In addition, in the above example, the regulation method identifies the service type through outgoing call analysis and then determines whether the call is subject to regulation. When the need arises, regulations such as disconnecting the subscriber circuit of the service from the exchange are also possible.

As explained above, the present invention measures the incompleteness rate for each service type, and when the exchange is congested, restricts only calls to service types whose incompleteness rate exceeds a certain value. , the direct cause of exchange congestion can be removed, and the exchange can be operated efficiently.

[Brief explanation of drawings]

FIG. 1 shows an example of a general service exchange, and FIG. 2 shows an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Communication path, 2...Central processing unit, 3...Telephone terminal, 4...Facsimile terminal, 5...Combined terminal, 6...
Telephone line, 7...Data line, 8...Storage trunk,
9...Facsimile line, 21...Memory, 22,2
3...Field, 24...Specific address, 25...Arithmetic circuit, 26...Address line, 27...Control line, 28...Register, 29...Verification circuit, 30...AND circuit, 3
1... Regulation signal generation circuit, 32... Read/write line,
33, 34, 35, 36, 37...output line, 38,
39...Input line.

Claims (1)

[Scope of Claims] 1. In a general service exchange that handles a plurality of service types, means for measuring the number of calls added and the number of incomplete calls for each service type of the general service exchange; means for determining a call incomplete rate for each service type based on the number of added calls and the number of incomplete calls; means for detecting a service type for which the incomplete rate exceeds a separately determined threshold; 1. A traffic control method for a comprehensive service switching system, comprising: means for detecting congestion in the integrated service switching system; and means for restricting calls of the detected service type when congestion in the integrated service switching system is detected.