JPH0113667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traffic control system in a switched network such as a telephone switched network that can prevent subscriber congestion in a switched network.

In general, in telephone exchange networks, etc., when the number of calls to a specific subscriber increases due to seat reservations, admission ticket reservations, TV rentals, etc. using the telephone, the number of busy calls increases because the specific subscriber becomes congested, and as a result, the number of busy calls increases. This may also have an adverse effect on general subscribers accommodated in the same subscriber exchange, and may even lead to network paralysis. Conventionally, methods have been adopted to deal with this problem, such as accommodating subscribers who are likely to cause subscriber congestion in special exchanges, or limiting the accommodating of general subscribers in consideration of subscriber congestion. but,
These methods have economical problems such as requiring a large number of special exchanges or reducing the subscriber capacity of the exchanges. In addition, when a particular subscriber's number of lines is small, it is often necessary to set up a temporary phone line, and in the past, if there was not enough room in the exchange, these were accommodated in another exchange unit in the same building, but the telephone number of the temporary phone It is not possible to combine an existing number with a representative number, and a new reception number must be set.Although it requires a complicated procedure to make the reception number known, it has the disadvantage of increasing the number of mistaken calls. It was hot too.

The purpose of the present invention is to provide a traffic control method in a switching network that is useful in overcoming these conventional drawbacks.
A specific incoming call can be automatically transferred to an alternative subscriber terminal of a predetermined alternative exchange. Examples will be described in detail below.

1 and 2 are block diagrams of main parts of a telephone switching network implementing the present invention, and in each figure, 1, 1,
2, 5, and 6 are subscriber exchanges that accommodate subscribers;
3 and 4 are trunk exchanges, 11 to 17 are trunk lines, 21
~23 is the subscriber, 31 is the subscriber line of subscriber 21,
41 is a satellite line, 51 is a communication satellite, 61 is a satellite terminal station, 62 is a mobile satellite terminal station, and 71 is an alternative subscriber terminal.

In FIG. 1, for example, when a subscriber 21 accommodated in a subscriber exchange 5 conducts a charity event and collects donations, calls from various places to the subscriber 21 are sent to the trunk lines 11 to 16, etc. If the subscriber exchange 5 and the trunk line 16 are congested as described above, the subscriber 2
It will also be difficult for general subscribers such as 2 and 23 to make and receive calls.

If there is a risk as described above, the system according to the embodiment of the present invention operates as follows. In the following description, the subscriber 21 is assumed to be a representative subscriber having a plurality of lines, and its terminating number (representative subscriber number) is assumed to be A. In addition, the relay exchange 4 and the subscriber exchange 5
is equipped with a conversion circuit (details will be described later) that converts a specific called number that has been set to another converted called number that has been set.For example, if called number A is set to be converted to called number B, ing. The called number B corresponds to a subscriber terminal accommodated in the subscriber exchange 6, for example, and the subscriber exchange 6 and the subscriber terminal related to the converted called number are hereinafter referred to as the substitute exchange 6 and the substitute subscriber terminal 71. I'll decide.

In FIG. 2, for example, when a call occurs from subscriber exchange 1 to subscriber 21, when the call arrives at relay exchange 4 via trunk lines 11 and 13, a conversion circuit installed there converts the called number into A
is converted to called number B. As a result, trunk line 1
Trunk 17 is captured instead of 6 and the call reaches the alternate exchange 6 and is connected to the alternate subscriber terminal 71.
The satellite line 4 is connected between the alternative subscriber terminal 71 and the subscriber 21.
1, and the call is therefore connected to subscriber 21 via satellite line 41.

Also, regarding a call from subscriber 22 to subscriber 21, the conversion circuit provided in subscriber exchange 5 converts the called number A to B, so the trunk line 1
6, the call is connected to the subscriber 21 via the trunk exchange 4, the alternate exchange 6, the alternate subscriber terminal 71, and the satellite line 41.

In this way, all calls to the subscriber 21 arrive at the alternative exchange 6, so the subscriber exchange 5 is not congested, and the calls made and received by the general subscribers 22 and 23 are not harmed. Note that if the substitute exchange 6 is a substitute-only exchange or an exchange with sufficient capacity, the exchange will not become congested. In addition, by increasing the number of alternative subscriber terminals, the number of lines for subscriber 21 can be increased, making it possible to install temporary telephones, and since the incoming call number is converted within the network, the temporary telephone number is also the same as subscriber 21. number can be set. In addition, when the possibility of congestion disappears, such as when the charging ends, the conversion circuit is reset and
Incoming calls to subscriber 21 are again made via subscriber exchange 5 only, and alternative subscriber terminal 71 and satellite line 41 are prepared for congestion with other subscribers.

In the above embodiment, the alternative subscriber terminal 71 and the subscriber 21 are connected by the satellite line 41. According to this method, by moving the mobile satellite terminal station 62, a line can be set up with any point, so the effects of the present invention are best exhibited; however, the present invention is not limited to this method. There is no problem even if a wireless line or a metallic line is set up between the alternative subscriber terminal 71 and the subscriber 21.

Further, although the conversion circuit is installed in the relay exchange 4 and the subscriber exchange 5, it is also possible to install it only in the relay exchange 4, which is economical because the number of conversion circuits is reduced. In this case, a conversion circuit installed in the relay exchange 4 is installed so that the incoming number is converted from A to B as in the previous embodiment, and a part of the subscriber 21 line is connected to the mobile satellite terminal. station 6
2 and connect a part of it to the subscriber line 31 as it is. In this way, calls originating from sources other than the subscriber exchange 5 go through the relay exchange 4, so the called number is converted, and the call is connected to the subscriber 21 via the alternative exchange 6, as in the previous embodiment. . On the other hand, subscriber 2 calling from subscriber exchange 5
Since no conversion circuit is installed in the subscriber exchange 5, calls to the subscriber 1 go directly through the subscriber line 31 and are connected to some lines of the subscriber 21 connected thereto. According to this method, even if there is a diagonal line between subscriber exchanges, for example a line from subscriber exchange 1 or subscriber exchange 2 to subscriber exchange 5,
It becomes possible to install a conversion circuit only at the relay exchange.

Also, subscriber 21's line remains as subscriber line 3.
1, and a line may be set up in which only temporary calls go through the alternative exchange 6. In this case, converting the called number A to the called number B is the same as in the previous embodiment, but the ratio of converting the called number A to B (referred to as the exchange rate) is set to, for example, 0.8. In this way, 80% of incoming number A will be incoming number B.
Therefore, 80% of the calls are received via the alternative exchange 6 and are received via the other subscriber exchange 5, making the above-mentioned temporary telephone setting possible.

In the above embodiment, a line is set up between the alternative subscriber terminal 71 and the subscriber 21, but when the subscriber 21 is a person who provides telephone information services such as horse race results, the subscriber 21 normally Since this is a tape recorder installed at the station, alternative subscriber terminal 7
You can connect a tape recorder directly to 1. Further, if a different telephone reception location is acceptable, the telephone may be connected directly to the alternative subscriber terminal 71.

Furthermore, in the above embodiment, the conversion of the called number is one-to-one.
Although the example is shown, the called number A may be converted to a plurality of (n) converted called numbers such as B, C, D, and E. This is more effective because calls can be distributed to multiple alternative exchanges.

It should be noted that there is no problem whether the alternative exchange 6 is a dedicated exchange for implementing the present invention or a general subscriber exchange with sufficient processing capacity. Furthermore, in the explanation, the exchange of another station is used as an alternative exchange, but the alternative exchange may be another exchange in the same building as the subscriber exchange 5.

FIG. 3 is a main circuit diagram showing an embodiment of the conversion circuit used in the method of the present invention, in which 101 is a converted called number register, 102 is a converted called number register, 103 is a match detection circuit, and 104 is a conversion rate register. , 105 is a ratio pulse generator, 106 is a switch, 111 to 113 are setting lines, 114 and 115 are input and output lines of this conversion circuit, 116 is an output of the coincidence detection circuit, 117 is a ratio pulse generator 10
5, and in the above embodiment, the called number A is sent to the set line 11 in the converted called number register 101.
1, and the converted called number B is set in the converted called number register 102 via the setting line 112. Also, since the conversion rate is 1.0,
1 through the setting line 113 to the conversion rate register 104
is set to .

When a called number is input through the input line 114, the match detection circuit 103 compares the input called number with the contents of the register 101, and if the two numbers match, the input called number is called number A, so it is Turn on output 116 and drive ratio pulse generator 105. When the ratio pulse generator 105 is driven, it turns on its output 117 according to the ratio set in the register 104. In the above example, since the conversion rate 1 is set in the register 104, the output 117 is Always on. The switch 106 outputs the contents of the register 102 to the output line 115 while the output 117 is on, and outputs the contents of the input line 114 to the output line 115 while the output 117 is off. Therefore, in the above example where the conversion rate is 1, when the called number A is input to the input line 114, the called number B is always outputted to the output line 115, and the called number is converted. Note that if the incoming number is other than A, the contents of the input line 114 will be transferred to the output line 115 as is.
is output and no conversion operation is performed.

For example, as the conversion rate in the conversion rate register 104,
If you set 0.6, the ratio pulse generator 10
5 is driven, its output 117 is on average 0.6
Turn on at a rate of . Therefore, the called number A is 0.6
It will be converted to B at a rate of The ratio pulse generator 105 that performs such an operation includes a circuit that generates a uniform random number from 0 to 1.0, and a circuit that turns on the output 117 when the generated random number is between 0 and 0.6 and turns off the output 117 otherwise. However, for further simplification, a counter may be used to turn on the output 117 six times and then turn it off the next four times.

Although FIG. 3 shows a circuit that performs one set of conversions for convenience of explanation, if there is a possibility that congestion of multiple subscribers will occur at the same time, multiple sets of conversions may be performed, for example, from terminating number A to B, and from C to D. , E to F. It is necessary to configure the circuit so that the conversion from E to F can be performed. Since such a circuit can be easily inferred from the circuit shown in FIG. 3, its explanation will be omitted.

FIG. 4 is a block diagram of a main part of a 1:n conversion circuit that converts a called number into a plurality of converted called numbers.
The same symbols as in FIG. 3 indicate the same parts, 107 is a converted called number register, 119 is its setting line, 12
1 is a conversion number ratio register, 131 is a setting line thereof, 122 is a ratio pulse generator having multiple inputs and outputs, 123 is a switch, and 132 to 136 are outputs.

For example, when converting a called number A to B and C at a conversion ratio of 7:3, set the converted called number B in the converted called number register 102, set the converted called number C in the converted called number register 107, and set the converted called number 0.7 and 0.3 are set in the register 121 as conversion number ratios. Coincidence detection circuit 103 in FIG.
When output 116 of output drives ratio pulse generator 122, ratio pulse generator 122 turns on its output 134 at a rate of 0.7 and output 135 at a rate of 0.3.
Turn on at a rate of . The switch 123 outputs 13
While the output 135 is on, the contents of the register 102, that is, the incoming call number B, are selected and output, and while the output 135 is on, the contents of the register 107, that is, the incoming call number C, are selected and output. Therefore, the called number A will be converted to B and C at a ratio of 7:3.

Note that the output 136 of the switch 123 corresponds to the output 118 in FIG.
The entire circuit is configured such that 36 is input to the switch 106. Therefore, the rate at which the called number A is converted to another called number is controlled by the conversion rate of the register 104 in FIG. Further, although the above example uses a 1-to-2 (n=2) conversion, a circuit that performs a conversion where n≧3 can be configured in a similar manner.

As explained above, the present invention is configured to automatically transfer part or all of a call to a specific subscriber to an alternate subscriber terminal in a predetermined alternate exchange using a conversion circuit provided in an exchange. If a line is temporarily connected between the alternate subscriber terminal and the subscriber, those calls will be connected via the alternate exchange, so the exchange that accommodates the specific subscriber will not be congested, and general calls will not be congested. Communication between incoming and outgoing calls can be ensured.
Furthermore, according to this method, even when a temporary telephone is set up for a specific subscriber, there is an advantage that the same number as the subscriber number of the specific subscriber can be assigned to the temporary telephone. If you set up an alternative exchange, you can almost eliminate the limit on the number of temporary calls.

In addition, in the above-mentioned embodiment, an application example was shown in the case of subscriber congestion where calls to a specific subscriber are concentrated.
The method of the present invention is not limited to this. For example, it can be applied when subscribers are temporarily moved or when important subscribers are temporarily accommodated in another exchange in the event of a large-scale failure of an exchange due to fire.
Since the terminating number is converted within the network, the advantage arises that there is no need to change the subscriber number. Furthermore, the system of the present invention can be applied to various switching networks such as facsimile switching networks and data switching networks in addition to telephone networks.

[Brief explanation of drawings]

1 and 2 are main block diagrams showing an example of a telephone switching network implementing the present invention, and FIGS. 3 and 4 are main block diagrams showing different embodiments of the conversion circuit used in the system of the present invention. It is a diagram. 1, 2, 5, 6 are subscriber exchanges, 3, 4 are transit exchanges, 11 to 17 are trunk lines, 21 to 23 are subscribers, 31 is subscriber line, 41 is satellite line, 51 is communication satellite, 61 is a satellite terminal station, 62 is a mobile satellite terminal station,
71 is an alternative subscriber terminal.

Claims (1)

[Claims] 1. An alternative subscriber terminal is provided in a voluntary exchange separate from the exchange accommodating the voluntary subscriber, and means are provided for temporarily or continuously connecting part or all of the voluntary subscriber line to the alternative subscriber terminal. , the subscriber number of the optional subscriber is sent to another subscriber terminal related to the optional subscriber terminal.
Alternatively, a conversion circuit for converting into a plurality of converted terminating numbers is provided in at least one of the subscriber exchange and the relay exchange, and the conversion circuit converts the arbitrary subscriber number into the converted terminating number, thereby providing a conversion circuit to the arbitrary subscriber. A traffic control system in a switching network, characterized in that part or all of calls are connected to alternative subscriber terminals of the alternative exchange.