JP2746308B2 - ATM traffic policing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] The present invention relates to a traffic control system in an ATM communication system, and more specifically, monitors and monitors a cell flow rate for each user during communication.
Regarding the controlled ATM traffic policing method, the purpose is to realize appropriate traffic policing according to the call data without lowering the serviceability to the user, and for each medium of the call data that can be handled in the ATM communication network,
A safety coefficient table storage means for storing a safety coefficient indicating a permissible range of variation in traffic volume as a table, and a declared value indicating a traffic volume of communication data to be talked and a call to be talked to when calling from a user. The user is required to declare media information indicating the medium of the data, the security factor corresponding to the media information is determined from the security factor table storage means, and the threshold of the traffic amount to be allowed to the user is determined from the security factor and the declared value. Threshold generating means for generating, monitoring means for monitoring the traffic volume of the call data of the user after the user starts a call, comparing means for comparing a monitor value by the monitoring means with the threshold generated by the threshold generating means And a step for discarding call data from the user when the monitor value exceeds the threshold value in the comparing means. Configured to have a Kuta means.

[Industrial applications]

The present invention relates to a traffic control system in an ATM communication system, and more particularly, to an ATM traffic policing system for monitoring and controlling a cell flow rate for each user during communication.

[Conventional technology]

The ATM communication system is a communication system for transmitting high-speed, large-capacity communication by transmitting call data from a user in fixed-length packets called cells and exchanging the cells at high speed by a hardware switch.

Since the ATM communication system has a very high information transmission capacity, in addition to steady voice signals, call data of all media including burst information such as locally concentrated data information and image information are integrated and exchanged. Is done. In this case, since the call data is statistically multiplexed and transmitted to the currently vacant cell, the cell may be discarded, a fluctuation delay may occur, or network congestion may occur. Therefore, there is a need for a traffic monitoring / control technology that guarantees the required quality of dynamically fluctuating calls and protects resources in the network. Moreover, in this traffic control, it is desired that there are few restrictions imposed on the user from the viewpoint of enhancing the serviceability. Such traffic control is called traffic policing.

FIG. 5 shows a conventional example for realizing traffic policing. FIG. 1 shows an example in which an ATM subscriber exchange 2 for exchange-connecting call data 9 sent from a subscriber's home (terminal) via an ATM transmission line 1 performs traffic policing.

First, at the start of a call, the user sends outgoing call data 3 including a declared value 5 (this value is set to L) indicating the traffic volume of the call to be made from now on to the ATM local exchange 2. The declared value 5 is, for example, an average band, a peak band, and the like of call data to be used for a call.

In the ATM subscriber exchange 2, the signal processing circuit 4 extracts the value L of the declared value 5 from the outgoing call data 3 and sends it to the call acceptance determining unit 6. The call admission determination unit 6 sets the value L of the declared value 5 as the threshold L in the threshold register 8 as it is.

Thereafter, the user starts a call, and the call data 9 of the user is sent from the subscriber's house. ATM subscriber exchange 2
Then, the traffic amount of the call data 9 is monitored by the bandwidth monitor 10 and output as the monitor value 11.

The monitor value 11 described above is compared in the comparator 12 with the threshold value 7 set in the threshold value register 8. And
If the monitor value 11 does not exceed the threshold value 7, the comparator 12 controls the selector 13 to guide the call data 9 to the call path and make the switching connection. On the other hand, if the monitor value 11 exceeds the threshold value 7, the comparator 12 controls the selector 13 to discard the call data 9.

As described above, in the conventional example, traffic policing is performed so that the band of the call data 9 does not exceed the value L of the declared value 5 declared by the user in advance.

[Problems to be solved by the invention]

However, when the transmission of various burst information, for which demand is expected to increase in the future, is considered to be transmitted through the ATM transmission line 1, the true bandwidth of the information generated in a burst manner cannot be changed until the call is terminated. Nevertheless, it is difficult for a user to declare an accurate value at the time of calling. Therefore, if the cell is immediately discarded when the traffic monitor value 11 of the call data 9 exceeds the value L of the declared value 5 of the user as in the conventional example of FIG. A situation can occur where cells are discarded even if they intend to do so. As described above, the conventional example has a problem that the serviceability to the user is reduced.

An object of the present invention is to realize appropriate traffic policing according to call data without lowering serviceability to a user.

[Means for solving the problem]

FIG. 1 is a block diagram of the present invention. The present invention relates to the AT
An ATM traffic policing method for monitoring and controlling the traffic of the M communication network 14 is assumed.

First, there is provided a safety coefficient table storage means 15 for storing, as a table, a safety coefficient 16 indicating a permissible range of variation in traffic amount for each medium of call data that can be handled by the ATM communication network 14.

Next, at the time of calling from the user, the user is required to declare a declared value 17 indicating the traffic volume of the call data to be talked about and media information 18 indicating the medium of the call data to be talked about, A threshold generation unit 19 is provided for obtaining a safety factor 16 corresponding to the information from the safety factor table storage unit 15 and generating a threshold 20 of a traffic amount to be permitted to the user from the safety factor 16 and a reported value 17 from the user. Here, the declared value 17 is, for example, an average band, a peak band, or the like of call data to be used for a call. Further, the above-described safety coefficient 16 is a coefficient indicating how many times the traffic volume is allowed to increase from the declared value 17 from the user for each medium. Then, the threshold value generating means 19 generates the threshold value 20 by, for example, multiplying the declared value 17 by the safety coefficient 16.

On the other hand, after the call is started by the user, the call data of the user
It has a monitoring means 22 for monitoring the traffic volume of 21.

Further, the monitor value 23 by the monitor means 22 and the threshold value generation means
There is a comparing means 24 for comparing the threshold value 20 generated in 19 with the threshold value 20.

And, when the monitor value 23 exceeds the threshold value 20 in the comparing means 24, there is provided a selector means 25 for discarding the call data 21 from the user.

[Action]

When the threshold value generating means 19 generates the threshold value 20 of the traffic volume to be allowed for the user, the deviation according to the medium of the call data that the user intends to call from now, not the declared value 17 from the user at the time of calling. Generate a value that allows for The permissible width of this deviation is stored in the preliminary security coefficient table storage means 15 as a safety coefficient 16 for each medium, and the threshold value generation means 19 stores the safety coefficient 16 corresponding to the media information 18 from the user. By reading from the coefficient table storage means 15, the threshold value 20 can be generated.
Then, the threshold value 20 generated in this way is compared with the monitor value 23 by the comparing means 24, so that the selector means 25 determines whether or not the call data 21 should be discarded.

Therefore, for example, to allow a certain amount of increase in the traffic volume of the communication data 21 of a medium having a large traffic fluctuation such as burst information, and reduce the allowable width for the communication data 21 of a medium having a small traffic fluctuation. Therefore, appropriate traffic policing can be performed without lowering the serviceability to the user.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a configuration diagram of an embodiment of the present invention. The figure shows
Similar to the conventional example of FIG. 5 described above, an example in which the ATM subscriber exchange 2 for exchange-connecting the call data 9 sent from the subscriber premises (terminal) via the ATM transmission line 1 performs traffic policing. It is shown.

2, the declared value 5, the threshold register 8, the call data 9,
The configurations and operations of the band monitor 19, the monitor value 11, the comparator 12, and the selector 13 are the same as those of the conventional example shown in FIG.

In the embodiment shown in FIG. 2, call data 3 'sent from the user at the time of calling and a signal processing circuit 4' for processing the call data 3 '.
The configuration of the call admission determination unit 6 'is different from that of the conventional example shown in FIG.

First, the calling data 3 'to be transmitted from the user at the time of calling includes not only the declared value 5 indicating the traffic volume of the call which the user intends to make but also the media of the call data which the user is going to call, as in the conventional example. Media information indicating
26 is also included. FIG. 4 shows the packet structure of the call data 3 '. As shown in the figure, normal call information 30 and destination address 31
In addition to each information of upper layer compatibility 32,
The declared value 5 and the media information 26 are included. The declared value 5 is
As in the conventional example shown in FIG. 5, for example, the average band and the peak band of call data to be used for a call from now on. Further, the media information 26 has media attributes such as “compressed image”, “silent deleted voice”, and “data”.

The outgoing call data 3 'sent from the user as described above is received by the signal processing circuit 4' and the declared value 5 (the value is set to L) and the media information 26 are taken out, and the call acceptance judgment is made. Sent to the unit 6 '.

The call admission determination unit 6 'has a configuration including a safety coefficient table memory 27 and a multiplier 29, as shown in FIG.

First, the safety coefficient table memory 27 stores, for example, a safety coefficient table as shown in FIG. As shown in the figure, a security coefficient 28 is stored for each type of media that can be handled as the call data 9 of the ATM transmission line 1 in FIG. The security coefficient 28 is a coefficient indicating how many times the traffic volume is allowed to increase from the value L of the declared value 5 from the user for each medium, and the information having a higher burst property has a larger value.

Now, the media information 26 from the user is output by the signal processing circuit 4 '.
Is extracted, the safety coefficient table memory 27 is accessed based on the information, and (this value is set to α) is read out to the safety coefficient 28 corresponding to the specified medium (for example, a compressed image (interframe coding)).

The value α of the safety coefficient 28 is input to the multiplier 29, where it is multiplied by the value L of the declared value 5 extracted by the signal processing circuit 4 '. Then, the multiplication result Lα is set in the threshold register 8 as the threshold 7 ′.

After the above operation, the user starts a call. The subsequent operation is the same as that of the conventional example shown in FIG. 5. The traffic amount of the call data 9 is monitored by the band monitor 10, and the monitor value 11 is set in the threshold value register 8 in the comparator 12. Is compared with the threshold value 7 '. If the monitor value 11 does not exceed the threshold value 7 ', the comparator 12
Controls the selector 13 to guide the call data 9 to an equal path, and performs the exchange connection. On the other hand, when the monitor value 11 is equal to the threshold value 7 '
, The comparator 12 controls the selector 13 to discard the call data 9.

As described above, in the present embodiment, the band of the call data 9 is not the value L of the declared value 5 declared by the user in advance,
Traffic policing is performed so as not to exceed a value Lα considering the shift width α.

Therefore, a certain amount of increase in the traffic volume is allowed for the communication data 9 of the media having a large traffic fluctuation such as burst information, and the allowable width is reduced for the communication data 9 of the medium having a small traffic fluctuation. It is possible to perform appropriate traffic policing without lowering the serviceability to the user.

〔The invention's effect〕

According to the present invention, when a threshold value of a traffic volume to be allowed for a user is generated, a deviation according to a medium of call data which the user intends to call from now, not a report value itself from the user at the time of calling. Because the expected value is generated, for example, a certain amount of increase in the traffic volume is allowed for media communication data such as burst information in which the traffic fluctuation is large, and Can reduce the allowable range, and perform appropriate traffic policing without lowering the serviceability to the user.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a block diagram of a safety coefficient table, and FIG. FIG. 5 shows a configuration example of call data. FIG. 5 is a configuration diagram of a conventional example. 14 ATM communication network 15 Security coefficient table storage means 16 Security coefficient 17 Reported value 18 Media information 19 Threshold generation means 20 Threshold 21 Communication Data, 22 monitor means, 23 monitor values, 24 comparison means, 25 selector means.

Continuation of the front page (56) References JP-A-61-198847 (JP, A) JP-A-2-192246 (JP, A) JP-A-1-183938 (JP, A) JP-A-4-108239 (JP) , A) JP-A-2-170645 (JP, A)

Claims (1)

(57) [Claims] 1. An ATM traffic policing method for monitoring and controlling traffic of an ATM communication network (14), wherein an allowable fluctuation amount of a traffic amount is indicated for each medium of call data that can be handled in the ATM communication network (14). Safety factor (1
(6) as a table, a safety coefficient table storage means (15), when a call is made from a user, a declared value (17) indicating the traffic volume of the call data to be talked about, and a call value of the call data to be talked about. The user is required to declare media information (18) indicating the media, a security factor (16) corresponding to the media information is obtained from the security factor table storage means (15), and the security factor and the declared value (17) are determined. Threshold generation means (19) for generating a threshold (20) of the traffic volume to be allowed for the user from the following; and, after the user starts a call, call data (21) of the user
Monitoring means (22) for monitoring the traffic volume of the above; comparing means (24) for comparing a monitored value (23) of the monitoring means with a threshold value (20) generated by the threshold value generating means (19); In the comparing means, the monitor value (23) is set to the threshold value (2
0), the call data from the user (21)
Selector means (25) for discarding an ATM traffic.